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<a href="#gstreamer-GstMessage.description" class="shortcut">Description</a>
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<h2><span class="refentrytitle"><a name="gstreamer-GstMessage.top_of_page"></a>GstMessage</span></h2>
<p>GstMessage — Lightweight objects to signal the application of
pipeline events</p>
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<div class="refsynopsisdiv">
<a name="gstreamer-GstMessage.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage">GstMessage</a>;
enum <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType">GstMessageType</a>;
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-SRC:CAPS" title="GST_MESSAGE_SRC()">GST_MESSAGE_SRC</a> (message)
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-SRC-NAME:CAPS" title="GST_MESSAGE_SRC_NAME()">GST_MESSAGE_SRC_NAME</a> (message)
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-TIMESTAMP:CAPS" title="GST_MESSAGE_TIMESTAMP()">GST_MESSAGE_TIMESTAMP</a> (message)
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-SEQNUM:CAPS" title="GST_MESSAGE_SEQNUM()">GST_MESSAGE_SEQNUM</a> (message)
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-TYPE:CAPS" title="GST_MESSAGE_TYPE()">GST_MESSAGE_TYPE</a> (message)
#define <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-TYPE-NAME:CAPS" title="GST_MESSAGE_TYPE_NAME()">GST_MESSAGE_TYPE_NAME</a> (message)
<a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a> <a class="link" href="gstreamer-GstMessage.html#gst-message-type-to-quark" title="gst_message_type_to_quark ()">gst_message_type_to_quark</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>);
const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-type-get-name" title="gst_message_type_get_name ()">gst_message_type_get_name</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-ref" title="gst_message_ref ()">gst_message_ref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-unref" title="gst_message_unref ()">gst_message_unref</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-copy" title="gst_message_copy ()">gst_message_copy</a> (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);
const <a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="returnvalue">GstStructure</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-get-structure" title="gst_message_get_structure ()">gst_message_get_structure</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);
#define <a class="link" href="gstreamer-GstMessage.html#gst-message-make-writable" title="gst_message_make_writable()">gst_message_make_writable</a> (msg)
<span class="returnvalue">guint32</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-get-seqnum" title="gst_message_get_seqnum ()">gst_message_get_seqnum</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-seqnum" title="gst_message_set_seqnum ()">gst_message_set_seqnum</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">guint32</span> seqnum</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-GstMessage.html#gst-message-has-name" title="gst_message_has_name ()">gst_message_has_name</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);
#define <a class="link" href="gstreamer-GstMessage.html#gst-message-is-writable" title="gst_message_is_writable()">gst_message_is_writable</a> (msg)
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-GstMessage.html#gst-message-replace" title="gst_message_replace ()">gst_message_replace</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> **old_message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *new_message</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-eos" title="gst_message_new_eos ()">gst_message_new_eos</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-error" title="gst_message_new_error ()">gst_message_new_error</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-error" title="gst_message_parse_error ()">gst_message_parse_error</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-warning" title="gst_message_new_warning ()">gst_message_new_warning</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-warning" title="gst_message_parse_warning ()">gst_message_parse_warning</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-info" title="gst_message_new_info ()">gst_message_new_info</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-info" title="gst_message_parse_info ()">gst_message_parse_info</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-tag" title="gst_message_new_tag ()">gst_message_new_tag</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstTagList.html#GstTagList" title="struct GstTagList"><span class="type">GstTagList</span></a> *tag_list</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-tag" title="gst_message_parse_tag ()">gst_message_parse_tag</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstTagList.html#GstTagList" title="struct GstTagList"><span class="type">GstTagList</span></a> **tag_list</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-buffering" title="gst_message_new_buffering ()">gst_message_new_buffering</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> percent</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-buffering" title="gst_message_parse_buffering ()">gst_message_parse_buffering</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *percent</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-buffering-stats" title="gst_message_set_buffering_stats ()">gst_message_set_buffering_stats</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstBufferingMode" title="enum GstBufferingMode"><span class="type">GstBufferingMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> avg_in</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> avg_out</code></em>,
<em class="parameter"><code><span class="type">gint64</span> buffering_left</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-buffering-stats" title="gst_message_parse_buffering_stats ()">gst_message_parse_buffering_stats</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstBufferingMode" title="enum GstBufferingMode"><span class="type">GstBufferingMode</span></a> *mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *avg_in</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *avg_out</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *buffering_left</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-state-changed" title="gst_message_new_state_changed ()">gst_message_new_state_changed</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> oldstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> newstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> pending</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-state-changed" title="gst_message_parse_state_changed ()">gst_message_parse_state_changed</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *oldstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *newstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *pending</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-state-dirty" title="gst_message_new_state_dirty ()">gst_message_new_state_dirty</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-step-done" title="gst_message_new_step_done ()">gst_message_new_step_done</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> intermediate</code></em>,
<em class="parameter"><code><span class="type">guint64</span> duration</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> eos</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-step-done" title="gst_message_parse_step_done ()">gst_message_parse_step_done</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *intermediate</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *duration</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *eos</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-clock-provide" title="gst_message_new_clock_provide ()">gst_message_new_clock_provide</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> ready</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-clock-provide" title="gst_message_parse_clock_provide ()">gst_message_parse_clock_provide</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *ready</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-clock-lost" title="gst_message_new_clock_lost ()">gst_message_new_clock_lost</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-clock-lost" title="gst_message_parse_clock_lost ()">gst_message_parse_clock_lost</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-new-clock" title="gst_message_new_new_clock ()">gst_message_new_new_clock</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-new-clock" title="gst_message_parse_new_clock ()">gst_message_parse_new_clock</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-application" title="gst_message_new_application ()">gst_message_new_application</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-element" title="gst_message_new_element ()">gst_message_new_element</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-custom" title="gst_message_new_custom ()">gst_message_new_custom</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-segment-start" title="gst_message_new_segment_start ()">gst_message_new_segment_start</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> position</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-segment-start" title="gst_message_parse_segment_start ()">gst_message_parse_segment_start</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *position</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-segment-done" title="gst_message_new_segment_done ()">gst_message_new_segment_done</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> position</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-segment-done" title="gst_message_parse_segment_done ()">gst_message_parse_segment_done</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *position</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-duration-changed" title="gst_message_new_duration_changed ()">gst_message_new_duration_changed</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-latency" title="gst_message_new_latency ()">gst_message_new_latency</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-async-start" title="gst_message_new_async_start ()">gst_message_new_async_start</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-async-done" title="gst_message_new_async_done ()">gst_message_new_async_done</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> running_time</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-async-done" title="gst_message_parse_async_done ()">gst_message_parse_async_done</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *running_time</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-step-start" title="gst_message_new_step_start ()">gst_message_new_step_start</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> intermediate</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-step-start" title="gst_message_parse_step_start ()">gst_message_parse_step_start</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *active</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *intermediate</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-qos" title="gst_message_new_qos ()">gst_message_new_qos</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> live</code></em>,
<em class="parameter"><code><span class="type">guint64</span> running_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> stream_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">guint64</span> duration</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-qos-values" title="gst_message_set_qos_values ()">gst_message_set_qos_values</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">gint64</span> jitter</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> proportion</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> quality</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-qos-stats" title="gst_message_set_qos_stats ()">gst_message_set_qos_stats</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> processed</code></em>,
<em class="parameter"><code><span class="type">guint64</span> dropped</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-qos" title="gst_message_parse_qos ()">gst_message_parse_qos</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *live</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *running_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *stream_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *timestamp</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *duration</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-qos-values" title="gst_message_parse_qos_values ()">gst_message_parse_qos_values</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *jitter</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *proportion</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *quality</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-qos-stats" title="gst_message_parse_qos_stats ()">gst_message_parse_qos_stats</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *processed</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *dropped</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-toc" title="gst_message_new_toc ()">gst_message_new_toc</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstToc.html#GstToc" title="GstToc"><span class="type">GstToc</span></a> *toc</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> updated</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-toc" title="gst_message_parse_toc ()">gst_message_parse_toc</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstToc.html#GstToc" title="GstToc"><span class="type">GstToc</span></a> **toc</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *updated</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-reset-time" title="gst_message_new_reset_time ()">gst_message_new_reset_time</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> running_time</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-reset-time" title="gst_message_parse_reset_time ()">gst_message_parse_reset_time</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *running_time</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-stream-start" title="gst_message_new_stream_start ()">gst_message_new_stream_start</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-group-id" title="gst_message_set_group_id ()">gst_message_set_group_id</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> group_id</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-group-id" title="gst_message_parse_group_id ()">gst_message_parse_group_id</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *group_id</code></em>);
enum <a class="link" href="gstreamer-GstMessage.html#GstStructureChangeType" title="enum GstStructureChangeType">GstStructureChangeType</a>;
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-structure-change" title="gst_message_new_structure_change ()">gst_message_new_structure_change</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStructureChangeType" title="enum GstStructureChangeType"><span class="type">GstStructureChangeType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *owner</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> busy</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-structure-change" title="gst_message_parse_structure_change ()">gst_message_parse_structure_change</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStructureChangeType" title="enum GstStructureChangeType"><span class="type">GstStructureChangeType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> **owner</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *busy</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-request-state" title="gst_message_new_request_state ()">gst_message_new_request_state</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-request-state" title="gst_message_parse_request_state ()">gst_message_parse_request_state</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *state</code></em>);
enum <a class="link" href="gstreamer-GstMessage.html#GstStreamStatusType" title="enum GstStreamStatusType">GstStreamStatusType</a>;
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-stream-status" title="gst_message_new_stream_status ()">gst_message_new_stream_status</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStreamStatusType" title="enum GstStreamStatusType"><span class="type">GstStreamStatusType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *owner</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-stream-status" title="gst_message_parse_stream_status ()">gst_message_parse_stream_status</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStreamStatusType" title="enum GstStreamStatusType"><span class="type">GstStreamStatusType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> **owner</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-set-stream-status-object" title="gst_message_set_stream_status_object ()">gst_message_set_stream_status_object</a>
(<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *object</code></em>);
const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="returnvalue">GValue</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-get-stream-status-object" title="gst_message_get_stream_status_object ()">gst_message_get_stream_status_object</a>
(<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);
enum <a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType">GstProgressType</a>;
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-progress" title="gst_message_new_progress ()">gst_message_new_progress</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType"><span class="type">GstProgressType</span></a> type</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *code</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-progress" title="gst_message_parse_progress ()">gst_message_parse_progress</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType"><span class="type">GstProgressType</span></a> *type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **code</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **text</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-need-context" title="gst_message_new_need_context ()">gst_message_new_need_context</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *context_type</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-context-type" title="gst_message_parse_context_type ()">gst_message_parse_context_type</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **context_type</code></em>);
<a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * <a class="link" href="gstreamer-GstMessage.html#gst-message-new-have-context" title="gst_message_new_have_context ()">gst_message_new_have_context</a> (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> *context</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-GstMessage.html#gst-message-parse-have-context" title="gst_message_parse_have_context ()">gst_message_parse_have_context</a> (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> **context</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-GstMessage.description"></a><h2>Description</h2>
<p>
Messages are implemented as a subclass of <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> with a generic
<a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> as the content. This allows for writing custom messages without
requiring an API change while allowing a wide range of different types
of messages.
</p>
<p>
Messages are posted by objects in the pipeline and are passed to the
application using the <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>.
</p>
<p>
The basic use pattern of posting a message on a <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> is as follows:
</p>
<p>
</p>
<div class="example">
<a name="id-1.3.29.4.5.1"></a><p class="title"><b>Example 10. Posting a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a></b></p>
<div class="example-contents">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstBus.html#gst-bus-post">gst_bus_post</a></span> <span class="gtkdoc opt">(</span>bus<span class="gtkdoc opt">,</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-new-eos">gst_message_new_eos</a></span><span class="gtkdoc opt">());</span></pre></td>
</tr>
</tbody>
</table>
</div>
</div>
<p><br class="example-break">
</p>
<p>
A <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> usually posts messages on the bus provided by the parent
container using <a class="link" href="GstElement.html#gst-element-post-message" title="gst_element_post_message ()"><code class="function">gst_element_post_message()</code></a>.
</p>
<p>
Last reviewed on 2005-11-09 (0.9.4)
</p>
</div>
<div class="refsect1">
<a name="gstreamer-GstMessage.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstMessage"></a><h3>struct GstMessage</h3>
<pre class="programlisting">struct GstMessage {
GstMiniObject mini_object;
GstMessageType type;
guint64 timestamp;
GstObject *src;
guint32 seqnum;
};
</pre>
<p>
A <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a> <em class="structfield"><code><a name="GstMessage.mini-object"></a>mini_object</code></em>;</span></p></td>
<td>the parent structure</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> <em class="structfield"><code><a name="GstMessage.type"></a>type</code></em>;</span></p></td>
<td>the <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> of the message</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint64</span> <em class="structfield"><code><a name="GstMessage.timestamp"></a>timestamp</code></em>;</span></p></td>
<td>the timestamp of the message</td>
</tr>
<tr>
<td><p><span class="term"><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *<em class="structfield"><code><a name="GstMessage.src"></a>src</code></em>;</span></p></td>
<td>the src of the message</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="GstMessage.seqnum"></a>seqnum</code></em>;</span></p></td>
<td>the sequence number of the message</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstMessageType"></a><h3>enum GstMessageType</h3>
<pre class="programlisting">typedef enum {
GST_MESSAGE_UNKNOWN = 0,
GST_MESSAGE_EOS = (1 << 0),
GST_MESSAGE_ERROR = (1 << 1),
GST_MESSAGE_WARNING = (1 << 2),
GST_MESSAGE_INFO = (1 << 3),
GST_MESSAGE_TAG = (1 << 4),
GST_MESSAGE_BUFFERING = (1 << 5),
GST_MESSAGE_STATE_CHANGED = (1 << 6),
GST_MESSAGE_STATE_DIRTY = (1 << 7),
GST_MESSAGE_STEP_DONE = (1 << 8),
GST_MESSAGE_CLOCK_PROVIDE = (1 << 9),
GST_MESSAGE_CLOCK_LOST = (1 << 10),
GST_MESSAGE_NEW_CLOCK = (1 << 11),
GST_MESSAGE_STRUCTURE_CHANGE = (1 << 12),
GST_MESSAGE_STREAM_STATUS = (1 << 13),
GST_MESSAGE_APPLICATION = (1 << 14),
GST_MESSAGE_ELEMENT = (1 << 15),
GST_MESSAGE_SEGMENT_START = (1 << 16),
GST_MESSAGE_SEGMENT_DONE = (1 << 17),
GST_MESSAGE_DURATION_CHANGED = (1 << 18),
GST_MESSAGE_LATENCY = (1 << 19),
GST_MESSAGE_ASYNC_START = (1 << 20),
GST_MESSAGE_ASYNC_DONE = (1 << 21),
GST_MESSAGE_REQUEST_STATE = (1 << 22),
GST_MESSAGE_STEP_START = (1 << 23),
GST_MESSAGE_QOS = (1 << 24),
GST_MESSAGE_PROGRESS = (1 << 25),
GST_MESSAGE_TOC = (1 << 26),
GST_MESSAGE_RESET_TIME = (1 << 27),
GST_MESSAGE_STREAM_START = (1 << 28),
GST_MESSAGE_NEED_CONTEXT = (1 << 29),
GST_MESSAGE_HAVE_CONTEXT = (1 << 30),
GST_MESSAGE_ANY = ~0
} GstMessageType;
</pre>
<p>
The different message types that are available.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-MESSAGE-UNKNOWN:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_UNKNOWN</code></span></p></td>
<td>an undefined message
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-EOS:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_EOS</code></span></p></td>
<td>end-of-stream reached in a pipeline. The application will
only receive this message in the PLAYING state and every time it sets a
pipeline to PLAYING that is in the EOS state. The application can perform a
flushing seek in the pipeline, which will undo the EOS state again.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-ERROR:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_ERROR</code></span></p></td>
<td>an error occured. When the application receives an error
message it should stop playback of the pipeline and not assume that more
data will be played.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-WARNING:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_WARNING</code></span></p></td>
<td>a warning occured.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-INFO:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_INFO</code></span></p></td>
<td>an info message occured
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-TAG:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_TAG</code></span></p></td>
<td>a tag was found.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-BUFFERING:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_BUFFERING</code></span></p></td>
<td>the pipeline is buffering. When the application
receives a buffering message in the PLAYING state for a non-live pipeline it
must PAUSE the pipeline until the buffering completes, when the percentage
field in the message is 100%. For live pipelines, no action must be
performed and the buffering percentage can be used to inform the user about
the progress.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STATE-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STATE_CHANGED</code></span></p></td>
<td>a state change happened
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STATE-DIRTY:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STATE_DIRTY</code></span></p></td>
<td>an element changed state in a streaming thread.
This message is deprecated.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STEP-DONE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STEP_DONE</code></span></p></td>
<td>a stepping operation finished.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-CLOCK-PROVIDE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_CLOCK_PROVIDE</code></span></p></td>
<td>an element notifies its capability of providing
a clock. This message is used internally and
never forwarded to the application.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-CLOCK-LOST:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_CLOCK_LOST</code></span></p></td>
<td>The current clock as selected by the pipeline became
unusable. The pipeline will select a new clock on
the next PLAYING state change. The application
should set the pipeline to PAUSED and back to
PLAYING when this message is received.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-NEW-CLOCK:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_NEW_CLOCK</code></span></p></td>
<td>a new clock was selected in the pipeline.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STRUCTURE-CHANGE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STRUCTURE_CHANGE</code></span></p></td>
<td>the structure of the pipeline changed. This
message is used internally and never forwarded to the application.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STREAM-STATUS:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STREAM_STATUS</code></span></p></td>
<td>status about a stream, emitted when it starts,
stops, errors, etc..
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-APPLICATION:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_APPLICATION</code></span></p></td>
<td>message posted by the application, possibly
via an application-specific element.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-ELEMENT:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_ELEMENT</code></span></p></td>
<td>element-specific message, see the specific element's
documentation
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-SEGMENT-START:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_SEGMENT_START</code></span></p></td>
<td>pipeline started playback of a segment. This
message is used internally and never forwarded to the application.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-SEGMENT-DONE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_SEGMENT_DONE</code></span></p></td>
<td>pipeline completed playback of a segment. This
message is forwarded to the application after all elements that posted
<em class="parameter"><code>GST_MESSAGE_SEGMENT_START</code></em> posted a GST_MESSAGE_SEGMENT_DONE message.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-DURATION-CHANGED:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_DURATION_CHANGED</code></span></p></td>
<td>The duration of a pipeline changed. The
application can get the new duration with a duration query.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-LATENCY:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_LATENCY</code></span></p></td>
<td>Posted by elements when their latency changes. The
application should recalculate and distribute a new latency.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-ASYNC-START:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_ASYNC_START</code></span></p></td>
<td>Posted by elements when they start an ASYNC
<a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>. This message is not forwarded to the application but is used
internally.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-ASYNC-DONE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_ASYNC_DONE</code></span></p></td>
<td>Posted by elements when they complete an ASYNC
<a class="link" href="GstElement.html#GstStateChange" title="enum GstStateChange"><span class="type">GstStateChange</span></a>. The application will only receive this message from the toplevel
pipeline.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-REQUEST-STATE:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_REQUEST_STATE</code></span></p></td>
<td>Posted by elements when they want the pipeline to
change state. This message is a suggestion to the application which can
decide to perform the state change on (part of) the pipeline.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STEP-START:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STEP_START</code></span></p></td>
<td>A stepping operation was started.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-QOS:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_QOS</code></span></p></td>
<td>A buffer was dropped or an element changed its processing
strategy for Quality of Service reasons.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-PROGRESS:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_PROGRESS</code></span></p></td>
<td>A progress message.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-TOC:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_TOC</code></span></p></td>
<td>A new table of contents (TOC) was found or previously found TOC
was updated.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-RESET-TIME:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_RESET_TIME</code></span></p></td>
<td>Message to request resetting the pipeline's
running time from the pipeline. This is an internal message which
applications will likely never receive.
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-STREAM-START:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_STREAM_START</code></span></p></td>
<td>Message indicating start of a new stream. Useful
e.g. when using playbin in gapless playback mode, to get notified when
the next title actually starts playing (which will be some time after
the URI for the next title has been set).
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-NEED-CONTEXT:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_NEED_CONTEXT</code></span></p></td>
<td>Message indicating that an element wants a specific context (Since 1.2)
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-HAVE-CONTEXT:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_HAVE_CONTEXT</code></span></p></td>
<td>Message indicating that an element created a context (Since 1.2)
</td>
</tr>
<tr>
<td><p><a name="GST-MESSAGE-ANY:CAPS"></a><span class="term"><code class="literal">GST_MESSAGE_ANY</code></span></p></td>
<td>mask for all of the above messages.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-SRC:CAPS"></a><h3>GST_MESSAGE_SRC()</h3>
<pre class="programlisting">#define GST_MESSAGE_SRC(message) (GST_MESSAGE_CAST(message)->src)
</pre>
<p>
Get the object that posted <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-SRC-NAME:CAPS"></a><h3>GST_MESSAGE_SRC_NAME()</h3>
<pre class="programlisting">#define GST_MESSAGE_SRC_NAME(message)</pre>
<p>
Get the name of the object that posted <em class="parameter"><code>message</code></em>. Returns "(NULL)" if
the message has no source object set.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-TIMESTAMP:CAPS"></a><h3>GST_MESSAGE_TIMESTAMP()</h3>
<pre class="programlisting">#define GST_MESSAGE_TIMESTAMP(message) (GST_MESSAGE_CAST(message)->timestamp)
</pre>
<p>
Get the timestamp of <em class="parameter"><code>message</code></em>. This is the timestamp when the message
was created.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-SEQNUM:CAPS"></a><h3>GST_MESSAGE_SEQNUM()</h3>
<pre class="programlisting">#define GST_MESSAGE_SEQNUM(message) (GST_MESSAGE_CAST(message)->seqnum)
</pre>
<p>
Get the sequence number of <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-TYPE:CAPS"></a><h3>GST_MESSAGE_TYPE()</h3>
<pre class="programlisting">#define GST_MESSAGE_TYPE(message) (GST_MESSAGE_CAST(message)->type)
</pre>
<p>
Get the <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> of <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-MESSAGE-TYPE-NAME:CAPS"></a><h3>GST_MESSAGE_TYPE_NAME()</h3>
<pre class="programlisting">#define GST_MESSAGE_TYPE_NAME(message) gst_message_type_get_name(GST_MESSAGE_TYPE(message))
</pre>
<p>
Get a constant string representation of the <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> of <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-type-to-quark"></a><h3>gst_message_type_to_quark ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Quarks.html#GQuark"><span class="returnvalue">GQuark</span></a> gst_message_type_to_quark (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>);</pre>
<p>
Get the unique quark for the given message type.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>the message type</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the quark associated with the message type</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-type-get-name"></a><h3>gst_message_type_get_name ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> * gst_message_type_get_name (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>);</pre>
<p>
Get a printable name for the given message type. Do not modify or free.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>the message type</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a reference to the static name of the message.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-ref"></a><h3>gst_message_ref ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_ref (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);</pre>
<p>
Convenience macro to increase the reference count of the message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>msg</code></em> :</span></p></td>
<td>the message to ref</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<em class="parameter"><code>msg</code></em> (for convenience when doing assignments)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-unref"></a><h3>gst_message_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_unref (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);</pre>
<p>
Convenience macro to decrease the reference count of the message, possibly
freeing it.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>msg</code></em> :</span></p></td>
<td>the message to unref</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-copy"></a><h3>gst_message_copy ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_copy (<em class="parameter"><code>const <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *msg</code></em>);</pre>
<p>
Creates a copy of the message. Returns a copy of the message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>msg</code></em> :</span></p></td>
<td>the message to copy</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new copy of <em class="parameter"><code>msg</code></em>.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-get-structure"></a><h3>gst_message_get_structure ()</h3>
<pre class="programlisting">const <a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="returnvalue">GstStructure</span></a> * gst_message_get_structure (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>
Access the structure of the message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The structure of the message. The structure is
still owned by the message, which means that you should not free it and
that the pointer becomes invalid when you free the message.
MT safe. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-make-writable"></a><h3>gst_message_make_writable()</h3>
<pre class="programlisting">#define gst_message_make_writable(msg) GST_MESSAGE_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (msg)))
</pre>
<p>
Checks if a message is writable. If not, a writable copy is made and
returned.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>msg</code></em> :</span></p></td>
<td>the message to make writable. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a message (possibly a duplicate) that is writable.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-get-seqnum"></a><h3>gst_message_get_seqnum ()</h3>
<pre class="programlisting"><span class="returnvalue">guint32</span> gst_message_get_seqnum (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>
Retrieve the sequence number of a message.
</p>
<p>
Messages have ever-incrementing sequence numbers, which may also be set
explicitly via <a class="link" href="gstreamer-GstMessage.html#gst-message-set-seqnum" title="gst_message_set_seqnum ()"><code class="function">gst_message_set_seqnum()</code></a>. Sequence numbers are typically used
to indicate that a message corresponds to some other set of messages or
events, for example a SEGMENT_DONE message corresponding to a SEEK event. It
is considered good practice to make this correspondence when possible, though
it is not required.
</p>
<p>
Note that events and messages share the same sequence number incrementor;
two events or messages will never have the same sequence number unless
that correspondence was made explicitly.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The message's sequence number.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-seqnum"></a><h3>gst_message_set_seqnum ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_seqnum (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">guint32</span> seqnum</code></em>);</pre>
<p>
Set the sequence number of a message.
</p>
<p>
This function might be called by the creator of a message to indicate that
the message relates to other messages or events. See <a class="link" href="gstreamer-GstMessage.html#gst-message-get-seqnum" title="gst_message_get_seqnum ()"><code class="function">gst_message_get_seqnum()</code></a>
for more information.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>seqnum</code></em> :</span></p></td>
<td>A sequence number.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-has-name"></a><h3>gst_message_has_name ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_message_has_name (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>
Checks if <em class="parameter"><code>message</code></em> has the given <em class="parameter"><code>name</code></em>. This function is usually used to
check the name of a custom message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>name to check</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>name</code></em> matches the name of the message structure.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-is-writable"></a><h3>gst_message_is_writable()</h3>
<pre class="programlisting">#define gst_message_is_writable(msg) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (msg))
</pre>
<p>
Tests if you can safely write into a message's structure or validly
modify the seqnum and timestamp fields.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>msg</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-replace"></a><h3>gst_message_replace ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_message_replace (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> **old_message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *new_message</code></em>);</pre>
<p>
Modifies a pointer to a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> to point to a different <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>. The
modification is done atomically (so this is useful for ensuring thread safety
in some cases), and the reference counts are updated appropriately (the old
message is unreffed, the new one is reffed).
</p>
<p>
Either <em class="parameter"><code>new_message</code></em> or the <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> pointed to by <em class="parameter"><code>old_message</code></em> may be NULL.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>old_message</code></em> :</span></p></td>
<td>pointer to a pointer to a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>
to be replaced. <span class="annotation">[<acronym title="Parameter for input and for returning results. Default is transfer full."><span class="acronym">inout</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>new_message</code></em> :</span></p></td>
<td>pointer to a <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> that will
replace the message pointed to by <em class="parameter"><code>old_message</code></em>. <span class="annotation">[<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if <em class="parameter"><code>new_message</code></em> was different from <em class="parameter"><code>old_message</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-eos"></a><h3>gst_message_new_eos ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_eos (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
Create a new eos message. This message is generated and posted in
the sink elements of a GstBin. The bin will only forward the EOS
message to the application if all sinks have posted an EOS message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new eos message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-error"></a><h3>gst_message_new_error ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_error (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);</pre>
<p>
Create a new error message. The message will copy <em class="parameter"><code>error</code></em> and
<em class="parameter"><code>debug</code></em>. This message is posted by element when a fatal event
occured. The pipeline will probably (partially) stop. The application
receiving this message should stop the pipeline.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>The GError for this message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>A debugging string.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new error message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-error"></a><h3>gst_message_parse_error ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_error (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);</pre>
<p>
Extracts the GError and debug string from the GstMessage. The values returned
in the output arguments are copies; the caller must free them when done.
</p>
<p>
Typical usage of this function might be:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc opt">...</span>
<span class="keyword">switch</span> <span class="gtkdoc opt">(</span><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GST-MESSAGE-TYPE:CAPS">GST_MESSAGE_TYPE</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">)) {</span>
<span class="keyword">case</span> GST_MESSAGE_ERROR<span class="gtkdoc opt">: {</span>
GError <span class="gtkdoc opt">*</span>err <span class="gtkdoc opt">=</span> NULL<span class="gtkdoc opt">;</span>
gchar <span class="gtkdoc opt">*</span>dbg_info <span class="gtkdoc opt">=</span> NULL<span class="gtkdoc opt">;</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-parse-error">gst_message_parse_error</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">, &</span>err<span class="gtkdoc opt">, &</span>dbg_info<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Warnings-and-Assertions.html#g-printerr">g_printerr</a></span> <span class="gtkdoc opt">(</span><span class="string">"ERROR from element %s: %s</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">,</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#GST-OBJECT-NAME:CAPS">GST_OBJECT_NAME</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">-></span>src<span class="gtkdoc opt">),</span> err<span class="gtkdoc opt">-></span>message<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Warnings-and-Assertions.html#g-printerr">g_printerr</a></span> <span class="gtkdoc opt">(</span><span class="string">"Debugging info: %s</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">, (</span>dbg_info<span class="gtkdoc opt">)</span> ? dbg_info <span class="gtkdoc opt">:</span> <span class="string">"none"</span><span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#g-error-free">g_error_free</a></span> <span class="gtkdoc opt">(</span>err<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Memory-Allocation.html#g-free">g_free</a></span> <span class="gtkdoc opt">(</span>dbg_info<span class="gtkdoc opt">);</span>
<span class="keyword">break</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_ERROR.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gerror</code></em> :</span></p></td>
<td>location for the GError. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>location for the debug message,
or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-warning"></a><h3>gst_message_new_warning ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_warning (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);</pre>
<p>
Create a new warning message. The message will make copies of <em class="parameter"><code>error</code></em> and
<em class="parameter"><code>debug</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>The GError for this message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>A debugging string.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new warning message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-warning"></a><h3>gst_message_parse_warning ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_warning (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);</pre>
<p>
Extracts the GError and debug string from the GstMessage. The values returned
in the output arguments are copies; the caller must free them when done.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_WARNING.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gerror</code></em> :</span></p></td>
<td>location for the GError. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>location for the debug message,
or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-info"></a><h3>gst_message_new_info ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_info (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> *error</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *debug</code></em>);</pre>
<p>
Create a new info message. The message will make copies of <em class="parameter"><code>error</code></em> and
<em class="parameter"><code>debug</code></em>.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>The GError for this message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>A debugging string.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new info message. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-info"></a><h3>gst_message_parse_info ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_info (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Error-Reporting.html#GError"><span class="type">GError</span></a> **gerror</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **debug</code></em>);</pre>
<p>
Extracts the GError and debug string from the GstMessage. The values returned
in the output arguments are copies; the caller must free them when done.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_INFO.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gerror</code></em> :</span></p></td>
<td>location for the GError. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>location for the debug message,
or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-tag"></a><h3>gst_message_new_tag ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_tag (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstTagList.html#GstTagList" title="struct GstTagList"><span class="type">GstTagList</span></a> *tag_list</code></em>);</pre>
<p>
Create a new tag message. The message will take ownership of the tag list.
The message is posted by elements that discovered a new taglist.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag_list</code></em> :</span></p></td>
<td>the tag list for the message. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new tag message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-tag"></a><h3>gst_message_parse_tag ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_tag (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstTagList.html#GstTagList" title="struct GstTagList"><span class="type">GstTagList</span></a> **tag_list</code></em>);</pre>
<p>
Extracts the tag list from the GstMessage. The tag list returned in the
output argument is a copy; the caller must free it when done.
</p>
<p>
Typical usage of this function might be:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc opt">...</span>
<span class="keyword">switch</span> <span class="gtkdoc opt">(</span><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GST-MESSAGE-TYPE:CAPS">GST_MESSAGE_TYPE</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">)) {</span>
<span class="keyword">case</span> GST_MESSAGE_TAG<span class="gtkdoc opt">: {</span>
GstTagList <span class="gtkdoc opt">*</span>tags <span class="gtkdoc opt">=</span> NULL<span class="gtkdoc opt">;</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-parse-tag">gst_message_parse_tag</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">, &</span>tags<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Warnings-and-Assertions.html#g-print">g_print</a></span> <span class="gtkdoc opt">(</span><span class="string">"Got tags from element %s</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">,</span> <span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#GST-OBJECT-NAME:CAPS">GST_OBJECT_NAME</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">-></span>src<span class="gtkdoc opt">));</span>
<span class="function">handle_tags</span> <span class="gtkdoc opt">(</span>tags<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstTagList.html#gst-tag-list-unref">gst_tag_list_unref</a></span> <span class="gtkdoc opt">(</span>tags<span class="gtkdoc opt">);</span>
<span class="keyword">break</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_TAG.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tag_list</code></em> :</span></p></td>
<td>return location for the tag-list. <span class="annotation">[<acronym title="Out parameter, where caller must allocate storage."><span class="acronym">out callee-allocates</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-buffering"></a><h3>gst_message_new_buffering ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_buffering (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> percent</code></em>);</pre>
<p>
Create a new buffering message. This message can be posted by an element that
needs to buffer data before it can continue processing. <em class="parameter"><code>percent</code></em> should be a
value between 0 and 100. A value of 100 means that the buffering completed.
</p>
<p>
When <em class="parameter"><code>percent</code></em> is < 100 the application should PAUSE a PLAYING pipeline. When
<em class="parameter"><code>percent</code></em> is 100, the application can set the pipeline (back) to PLAYING.
The application must be prepared to receive BUFFERING messages in the
PREROLLING state and may only set the pipeline to PLAYING after receiving a
message with <em class="parameter"><code>percent</code></em> set to 100, which can happen after the pipeline
completed prerolling.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td>The buffering percent</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new buffering message. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-buffering"></a><h3>gst_message_parse_buffering ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_buffering (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *percent</code></em>);</pre>
<p>
Extracts the buffering percent from the GstMessage. see also
<a class="link" href="gstreamer-GstMessage.html#gst-message-new-buffering" title="gst_message_new_buffering ()"><code class="function">gst_message_new_buffering()</code></a>.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_BUFFERING.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>percent</code></em> :</span></p></td>
<td>Return location for the percent. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-buffering-stats"></a><h3>gst_message_set_buffering_stats ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_buffering_stats (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstBufferingMode" title="enum GstBufferingMode"><span class="type">GstBufferingMode</span></a> mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> avg_in</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> avg_out</code></em>,
<em class="parameter"><code><span class="type">gint64</span> buffering_left</code></em>);</pre>
<p>
Configures the buffering stats values in <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_BUFFERING.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>a buffering mode</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>avg_in</code></em> :</span></p></td>
<td>the average input rate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>avg_out</code></em> :</span></p></td>
<td>the average output rate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffering_left</code></em> :</span></p></td>
<td>amount of buffering time left in milliseconds</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-buffering-stats"></a><h3>gst_message_parse_buffering_stats ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_buffering_stats (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstQuery.html#GstBufferingMode" title="enum GstBufferingMode"><span class="type">GstBufferingMode</span></a> *mode</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *avg_in</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *avg_out</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *buffering_left</code></em>);</pre>
<p>
Extracts the buffering stats values from <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_BUFFERING.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>a buffering mode, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>avg_in</code></em> :</span></p></td>
<td>the average input rate, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>avg_out</code></em> :</span></p></td>
<td>the average output rate, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffering_left</code></em> :</span></p></td>
<td>amount of buffering time left in
milliseconds, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-state-changed"></a><h3>gst_message_new_state_changed ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_state_changed (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> oldstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> newstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> pending</code></em>);</pre>
<p>
Create a state change message. This message is posted whenever an element
changed its state.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>oldstate</code></em> :</span></p></td>
<td>the previous state</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newstate</code></em> :</span></p></td>
<td>the new (current) state</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pending</code></em> :</span></p></td>
<td>the pending (target) state</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new state change message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-state-changed"></a><h3>gst_message_parse_state_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_state_changed (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *oldstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *newstate</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *pending</code></em>);</pre>
<p>
Extracts the old and new states from the GstMessage.
</p>
<p>
Typical usage of this function might be:
</p>
<div class="informalexample">
<table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
<tbody>
<tr>
<td class="listing_lines" align="right"><pre>1
2
3
4
5
6
7
8
9
10
11
12
13
14
15</pre></td>
<td class="listing_code"><pre class="programlisting"><span class="gtkdoc opt">...</span>
<span class="keyword">switch</span> <span class="gtkdoc opt">(</span><span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#GST-MESSAGE-TYPE:CAPS">GST_MESSAGE_TYPE</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">)) {</span>
<span class="keyword">case</span> GST_MESSAGE_STATE_CHANGED<span class="gtkdoc opt">: {</span>
GstState old_state<span class="gtkdoc opt">,</span> new_state<span class="gtkdoc opt">;</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstMessage.html#gst-message-parse-state-changed">gst_message_parse_state_changed</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">, &</span>old_state<span class="gtkdoc opt">, &</span>new_state<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
<span class="function"><a href="http://library.gnome.org/devel/glib/unstable/glib-Warnings-and-Assertions.html#g-print">g_print</a></span> <span class="gtkdoc opt">(</span><span class="string">"Element %s changed state from %s to %s.</span><span class="gtkdoc esc">\n</span><span class="string">"</span><span class="gtkdoc opt">,</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstObject.html#GST-OBJECT-NAME:CAPS">GST_OBJECT_NAME</a></span> <span class="gtkdoc opt">(</span>msg<span class="gtkdoc opt">-></span>src<span class="gtkdoc opt">),</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-state-get-name">gst_element_state_get_name</a></span> <span class="gtkdoc opt">(</span>old_state<span class="gtkdoc opt">),</span>
<span class="function"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstElement.html#gst-element-state-get-name">gst_element_state_get_name</a></span> <span class="gtkdoc opt">(</span>new_state<span class="gtkdoc opt">));</span>
<span class="keyword">break</span><span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span>
<span class="gtkdoc opt">}</span>
<span class="gtkdoc opt">...</span></pre></td>
</tr>
</tbody>
</table>
</div>
<p>
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STATE_CHANGED</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>oldstate</code></em> :</span></p></td>
<td>the previous state, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>newstate</code></em> :</span></p></td>
<td>the new (current) state, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pending</code></em> :</span></p></td>
<td>the pending (target) state, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-state-dirty"></a><h3>gst_message_new_state_dirty ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_state_dirty (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
Create a state dirty message. This message is posted whenever an element
changed its state asynchronously and is used internally to update the
states of container objects.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new state dirty message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-step-done"></a><h3>gst_message_new_step_done ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_step_done (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> intermediate</code></em>,
<em class="parameter"><code><span class="type">guint64</span> duration</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> eos</code></em>);</pre>
<p>
This message is posted by elements when they complete a part, when <em class="parameter"><code>intermediate</code></em> set
to TRUE, or a complete step operation.
</p>
<p>
<em class="parameter"><code>duration</code></em> will contain the amount of time (in GST_FORMAT_TIME) of the stepped
<em class="parameter"><code>amount</code></em> of media in format <em class="parameter"><code>format</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the format of <em class="parameter"><code>amount</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>amount</code></em> :</span></p></td>
<td>the amount of stepped data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate</code></em> :</span></p></td>
<td>the rate of the stepped amount</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flush</code></em> :</span></p></td>
<td>is this an flushing step</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>intermediate</code></em> :</span></p></td>
<td>is this an intermediate step</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>the duration of the data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>eos</code></em> :</span></p></td>
<td>the step caused EOS</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new step_done message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-step-done"></a><h3>gst_message_parse_step_done ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_step_done (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *intermediate</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *duration</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *eos</code></em>);</pre>
<p>
Extract the values the step_done message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STEP_DONE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>result location for the format. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>amount</code></em> :</span></p></td>
<td>result location for the amount. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate</code></em> :</span></p></td>
<td>result location for the rate. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flush</code></em> :</span></p></td>
<td>result location for the flush flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>intermediate</code></em> :</span></p></td>
<td>result location for the intermediate flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>result location for the duration. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>eos</code></em> :</span></p></td>
<td>result location for the EOS flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-clock-provide"></a><h3>gst_message_new_clock_provide ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_clock_provide (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> ready</code></em>);</pre>
<p>
Create a clock provide message. This message is posted whenever an
element is ready to provide a clock or lost its ability to provide
a clock (maybe because it paused or became EOS).
</p>
<p>
This message is mainly used internally to manage the clock
selection.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>the clock it provides. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ready</code></em> :</span></p></td>
<td>TRUE if the sender can provide a clock</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new provide clock message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-clock-provide"></a><h3>gst_message_parse_clock_provide ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_clock_provide (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *ready</code></em>);</pre>
<p>
Extracts the clock and ready flag from the GstMessage.
The clock object returned remains valid until the message is freed.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_CLOCK_PROVIDE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a pointer to hold a clock
object, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ready</code></em> :</span></p></td>
<td>a pointer to hold the ready flag, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-clock-lost"></a><h3>gst_message_new_clock_lost ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_clock_lost (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Create a clock lost message. This message is posted whenever the
clock is not valid anymore.
</p>
<p>
If this message is posted by the pipeline, the pipeline will
select a new clock again when it goes to PLAYING. It might therefore
be needed to set the pipeline to PAUSED and PLAYING again.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>the clock that was lost. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new clock lost message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-clock-lost"></a><h3>gst_message_parse_clock_lost ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_clock_lost (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>);</pre>
<p>
Extracts the lost clock from the GstMessage.
The clock object returned remains valid until the message is freed.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_CLOCK_LOST.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a pointer to hold the lost clock. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-new-clock"></a><h3>gst_message_new_new_clock ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_new_clock (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Create a new clock message. This message is posted whenever the
pipeline selectes a new clock for the pipeline.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>the new selected clock. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new new clock message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-new-clock"></a><h3>gst_message_parse_new_clock ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_new_clock (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> **clock</code></em>);</pre>
<p>
Extracts the new clock from the GstMessage.
The clock object returned remains valid until the message is freed.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_NEW_CLOCK.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a pointer to hold the selected
new clock. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-application"></a><h3>gst_message_new_application ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_application (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);</pre>
<p>
Create a new application-typed message. GStreamer will never create these
messages; they are a gift from us to you. Enjoy.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>structure</code></em> :</span></p></td>
<td>the structure for the message. The message
will take ownership of the structure. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new application message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-element"></a><h3>gst_message_new_element ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_element (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);</pre>
<p>
Create a new element-specific message. This is meant as a generic way of
allowing one-way communication from an element to an application, for example
"the firewire cable was unplugged". The format of the message should be
documented in the element's documentation. The structure field can be NULL.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>structure</code></em> :</span></p></td>
<td>The structure for the message. The message
will take ownership of the structure. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new element message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-custom"></a><h3>gst_message_new_custom ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_custom (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstStructure.html#GstStructure" title="struct GstStructure"><span class="type">GstStructure</span></a> *structure</code></em>);</pre>
<p>
Create a new custom-typed message. This can be used for anything not
handled by other message-specific functions to pass a message to the
app. The structure field can be NULL.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-GstMessage.html#GstMessageType" title="enum GstMessageType"><span class="type">GstMessageType</span></a> to distinguish messages</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>structure</code></em> :</span></p></td>
<td>the structure for the message. The message
will take ownership of the structure. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-segment-start"></a><h3>gst_message_new_segment_start ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_segment_start (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> position</code></em>);</pre>
<p>
Create a new segment message. This message is posted by elements that
start playback of a segment as a result of a segment seek. This message
is not received by the application but is used for maintenance reasons in
container elements.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>The format of the position being played</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The position of the segment being played</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new segment start message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-segment-start"></a><h3>gst_message_parse_segment_start ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_segment_start (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *position</code></em>);</pre>
<p>
Extracts the position and format from the segment start message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_SEGMENT_START.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>Result location for the format, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>Result location for the position, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-segment-done"></a><h3>gst_message_new_segment_done ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_segment_done (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> position</code></em>);</pre>
<p>
Create a new segment done message. This message is posted by elements that
finish playback of a segment as a result of a segment seek. This message
is received by the application after all elements that posted a segment_start
have posted the segment_done.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>The format of the position being done</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The position of the segment being done</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new segment done message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-segment-done"></a><h3>gst_message_parse_segment_done ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_segment_done (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *position</code></em>);</pre>
<p>
Extracts the position and format from the segment done message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_SEGMENT_DONE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>Result location for the format, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>Result location for the position, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-duration-changed"></a><h3>gst_message_new_duration_changed ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_duration_changed (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
Create a new duration changed message. This message is posted by elements
that know the duration of a stream when the duration changes. This message
is received by bins and is used to calculate the total duration of a
pipeline. Elements may post a duration message with a duration of
GST_CLOCK_TIME_NONE to indicate that the duration has changed and the
cached duration should be discarded. The new duration can then be
retrieved via a query.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new duration-changed message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-latency"></a><h3>gst_message_new_latency ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_latency (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
This message can be posted by elements when their latency requirements have
changed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new latency message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-async-start"></a><h3>gst_message_new_async_start ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_async_start (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
This message is posted by elements when they start an ASYNC state change.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new async_start message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-async-done"></a><h3>gst_message_new_async_done ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_async_done (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> running_time</code></em>);</pre>
<p>
The message is posted when elements completed an ASYNC state change.
<em class="parameter"><code>running_time</code></em> contains the time of the desired running_time when this
elements goes to PLAYING. A value of <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE"><span class="type">GST_CLOCK_TIME_NONE</span></a> for <em class="parameter"><code>running_time</code></em>
means that the element has no clock interaction and thus doesn't care about
the running_time of the pipeline.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>the desired running_time</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new async_done message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-async-done"></a><h3>gst_message_parse_async_done ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_async_done (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *running_time</code></em>);</pre>
<p>
Extract the running_time from the async_done message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_ASYNC_DONE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>Result location for the running_time or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-step-start"></a><h3>gst_message_new_step_start ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_step_start (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> active</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> intermediate</code></em>);</pre>
<p>
This message is posted by elements when they accept or activate a new step
event for <em class="parameter"><code>amount</code></em> in <em class="parameter"><code>format</code></em>.
</p>
<p>
<em class="parameter"><code>active</code></em> is set to FALSE when the element accepted the new step event and has
queued it for execution in the streaming threads.
</p>
<p>
<em class="parameter"><code>active</code></em> is set to TRUE when the element has activated the step operation and
is now ready to start executing the step in the streaming thread. After this
message is emited, the application can queue a new step operation in the
element.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>if the step is active or queued</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the format of <em class="parameter"><code>amount</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>amount</code></em> :</span></p></td>
<td>the amount of stepped data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate</code></em> :</span></p></td>
<td>the rate of the stepped amount</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flush</code></em> :</span></p></td>
<td>is this an flushing step</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>intermediate</code></em> :</span></p></td>
<td>is this an intermediate step</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new step_start message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-step-start"></a><h3>gst_message_parse_step_start ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_step_start (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *active</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *amount</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *rate</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *flush</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *intermediate</code></em>);</pre>
<p>
Extract the values from step_start message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STEP_DONE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>active</code></em> :</span></p></td>
<td>result location for the active flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>result location for the format. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>amount</code></em> :</span></p></td>
<td>result location for the amount. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate</code></em> :</span></p></td>
<td>result location for the rate. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flush</code></em> :</span></p></td>
<td>result location for the flush flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>intermediate</code></em> :</span></p></td>
<td>result location for the intermediate flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-qos"></a><h3>gst_message_new_qos ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_qos (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> live</code></em>,
<em class="parameter"><code><span class="type">guint64</span> running_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> stream_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> timestamp</code></em>,
<em class="parameter"><code><span class="type">guint64</span> duration</code></em>);</pre>
<p>
A QOS message is posted on the bus whenever an element decides to drop a
buffer because of QoS reasons or whenever it changes its processing strategy
because of QoS reasons (quality adjustments such as processing at lower
accuracy).
</p>
<p>
This message can be posted by an element that performs synchronisation against the
clock (live) or it could be dropped by an element that performs QoS because of QOS
events received from a downstream element (!live).
</p>
<p>
<em class="parameter"><code>running_time</code></em>, <em class="parameter"><code>stream_time</code></em>, <em class="parameter"><code>timestamp</code></em>, <em class="parameter"><code>duration</code></em> should be set to the
respective running-time, stream-time, timestamp and duration of the (dropped)
buffer that generated the QoS event. Values can be left to
GST_CLOCK_TIME_NONE when unknown.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>live</code></em> :</span></p></td>
<td>if the message was generated by a live element</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>the running time of the buffer that generated the message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream_time</code></em> :</span></p></td>
<td>the stream time of the buffer that generated the message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>the timestamps of the buffer that generated the message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>the duration of the buffer that generated the message</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new qos message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-qos-values"></a><h3>gst_message_set_qos_values ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_qos_values (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">gint64</span> jitter</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> proportion</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> quality</code></em>);</pre>
<p>
Set the QoS values that have been calculated/analysed from the QoS data
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_QOS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>jitter</code></em> :</span></p></td>
<td>The difference of the running-time against the deadline.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>proportion</code></em> :</span></p></td>
<td>Long term prediction of the ideal rate relative to normal rate
to get optimal quality.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>quality</code></em> :</span></p></td>
<td>An element dependent integer value that specifies the current
quality level of the element. The default maximum quality is 1000000.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-qos-stats"></a><h3>gst_message_set_qos_stats ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_qos_stats (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> processed</code></em>,
<em class="parameter"><code><span class="type">guint64</span> dropped</code></em>);</pre>
<p>
Set the QoS stats representing the history of the current continuous pipeline
playback period.
</p>
<p>
When <em class="parameter"><code>format</code></em> is <em class="parameter"><code>GST_FORMAT_UNDEFINED</code></em> both <em class="parameter"><code>dropped</code></em> and <em class="parameter"><code>processed</code></em> are
invalid. Values of -1 for either <em class="parameter"><code>processed</code></em> or <em class="parameter"><code>dropped</code></em> mean unknown values.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_QOS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>Units of the 'processed' and 'dropped' fields. Video sinks and video
filters will use GST_FORMAT_BUFFERS (frames). Audio sinks and audio filters
will likely use GST_FORMAT_DEFAULT (samples).</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>processed</code></em> :</span></p></td>
<td>Total number of units correctly processed since the last state
change to READY or a flushing operation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dropped</code></em> :</span></p></td>
<td>Total number of units dropped since the last state change to READY
or a flushing operation.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-qos"></a><h3>gst_message_parse_qos ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_qos (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *live</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *running_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *stream_time</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *timestamp</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *duration</code></em>);</pre>
<p>
Extract the timestamps and live status from the QoS message.
</p>
<p>
The returned values give the running_time, stream_time, timestamp and
duration of the dropped buffer. Values of GST_CLOCK_TIME_NONE mean unknown
values.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_QOS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>live</code></em> :</span></p></td>
<td>if the message was generated by a live element. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>the running time of the buffer that
generated the message. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream_time</code></em> :</span></p></td>
<td>the stream time of the buffer that
generated the message. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp</code></em> :</span></p></td>
<td>the timestamps of the buffer that
generated the message. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>duration</code></em> :</span></p></td>
<td>the duration of the buffer that
generated the message. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-qos-values"></a><h3>gst_message_parse_qos_values ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_qos_values (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><span class="type">gint64</span> *jitter</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gdouble"><span class="type">gdouble</span></a> *proportion</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *quality</code></em>);</pre>
<p>
Extract the QoS values that have been calculated/analysed from the QoS data
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_QOS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>jitter</code></em> :</span></p></td>
<td>The difference of the running-time against
the deadline. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>proportion</code></em> :</span></p></td>
<td>Long term prediction of the ideal rate
relative to normal rate to get optimal quality. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>quality</code></em> :</span></p></td>
<td>An element dependent integer value that
specifies the current quality level of the element. The default
maximum quality is 1000000. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-qos-stats"></a><h3>gst_message_parse_qos_stats ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_qos_stats (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstFormat.html#GstFormat" title="enum GstFormat"><span class="type">GstFormat</span></a> *format</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *processed</code></em>,
<em class="parameter"><code><span class="type">guint64</span> *dropped</code></em>);</pre>
<p>
Extract the QoS stats representing the history of the current continuous
pipeline playback period.
</p>
<p>
When <em class="parameter"><code>format</code></em> is <em class="parameter"><code>GST_FORMAT_UNDEFINED</code></em> both <em class="parameter"><code>dropped</code></em> and <em class="parameter"><code>processed</code></em> are
invalid. Values of -1 for either <em class="parameter"><code>processed</code></em> or <em class="parameter"><code>dropped</code></em> mean unknown values.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_QOS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>Units of the 'processed' and 'dropped' fields.
Video sinks and video filters will use GST_FORMAT_BUFFERS (frames).
Audio sinks and audio filters will likely use GST_FORMAT_DEFAULT
(samples). <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>processed</code></em> :</span></p></td>
<td>Total number of units correctly processed
since the last state change to READY or a flushing operation. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dropped</code></em> :</span></p></td>
<td>Total number of units dropped since the last
state change to READY or a flushing operation. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-toc"></a><h3>gst_message_new_toc ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_toc (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstToc.html#GstToc" title="GstToc"><span class="type">GstToc</span></a> *toc</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> updated</code></em>);</pre>
<p>
Create a new TOC message. The message is posted by elements
that discovered or updated a TOC.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>toc</code></em> :</span></p></td>
<td>
<a class="link" href="gstreamer-GstToc.html#GstToc" title="GstToc"><span class="type">GstToc</span></a> structure for the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>updated</code></em> :</span></p></td>
<td>whether TOC was updated or not.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new TOC message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-toc"></a><h3>gst_message_parse_toc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_toc (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstToc.html#GstToc" title="GstToc"><span class="type">GstToc</span></a> **toc</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *updated</code></em>);</pre>
<p>
Extract thef TOC from the <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a>. The TOC returned in the
output argument is a copy; the caller must free it with
<a class="link" href="gstreamer-GstToc.html#gst-toc-unref" title="gst_toc_unref()"><code class="function">gst_toc_unref()</code></a> when done.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_TOC.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>toc</code></em> :</span></p></td>
<td>return location for the TOC. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>updated</code></em> :</span></p></td>
<td>return location for the updated flag. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-reset-time"></a><h3>gst_message_new_reset_time ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_reset_time (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> running_time</code></em>);</pre>
<p>
This message is posted when the pipeline running-time should be reset to
<em class="parameter"><code>running_time</code></em>, like after a flushing seek.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>the requested running-time</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new reset_time message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-reset-time"></a><h3>gst_message_parse_reset_time ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_reset_time (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *running_time</code></em>);</pre>
<p>
Extract the running-time from the RESET_TIME message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_RESET_TIME.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>running_time</code></em> :</span></p></td>
<td>Result location for the running_time or
NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-stream-start"></a><h3>gst_message_new_stream_start ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_stream_start (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>);</pre>
<p>
Create a new stream_start message. This message is generated and posted in
the sink elements of a GstBin. The bin will only forward the STREAM_START
message to the application if all sinks have posted an STREAM_START message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new stream_start message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-group-id"></a><h3>gst_message_set_group_id ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_group_id (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> group_id</code></em>);</pre>
<p>
Sets the group id on the stream-start message.
</p>
<p>
All streams that have the same group id are supposed to be played
together, i.e. all streams inside a container file should have the
same group id but different stream ids. The group id should change
each time the stream is started, resulting in different group ids
each time a file is played for example.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>the message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>group_id</code></em> :</span></p></td>
<td>the group id</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-group-id"></a><h3>gst_message_parse_group_id ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_message_parse_group_id (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> *group_id</code></em>);</pre>
<p>
Extract the group from the STREAM_START message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STREAM_START.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>group_id</code></em> :</span></p></td>
<td>Result location for the group id or
NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the message had a group id set, <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="GstStructureChangeType"></a><h3>enum GstStructureChangeType</h3>
<pre class="programlisting">typedef enum {
GST_STRUCTURE_CHANGE_TYPE_PAD_LINK = 0,
GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK = 1
} GstStructureChangeType;
</pre>
<p>
The type of a <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-STRUCTURE-CHANGE:CAPS"><code class="literal">GST_MESSAGE_STRUCTURE_CHANGE</code></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-STRUCTURE-CHANGE-TYPE-PAD-LINK:CAPS"></a><span class="term"><code class="literal">GST_STRUCTURE_CHANGE_TYPE_PAD_LINK</code></span></p></td>
<td>Pad linking is starting or done.
</td>
</tr>
<tr>
<td><p><a name="GST-STRUCTURE-CHANGE-TYPE-PAD-UNLINK:CAPS"></a><span class="term"><code class="literal">GST_STRUCTURE_CHANGE_TYPE_PAD_UNLINK</code></span></p></td>
<td>Pad unlinking is starting or done.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-structure-change"></a><h3>gst_message_new_structure_change ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_structure_change (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStructureChangeType" title="enum GstStructureChangeType"><span class="type">GstStructureChangeType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *owner</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> busy</code></em>);</pre>
<p>
Create a new structure change message. This message is posted when the
structure of a pipeline is in the process of being changed, for example
when pads are linked or unlinked.
</p>
<p>
<em class="parameter"><code>src</code></em> should be the sinkpad that unlinked or linked.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>The change type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>owner</code></em> :</span></p></td>
<td>The owner element of <em class="parameter"><code>src</code></em>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>busy</code></em> :</span></p></td>
<td>Whether the structure change is busy.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new structure change message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-structure-change"></a><h3>gst_message_parse_structure_change ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_structure_change (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStructureChangeType" title="enum GstStructureChangeType"><span class="type">GstStructureChangeType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> **owner</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *busy</code></em>);</pre>
<p>
Extracts the change type and completion status from the GstMessage.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STRUCTURE_CHANGE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>A pointer to hold the change type. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>owner</code></em> :</span></p></td>
<td>The owner element of the
message source. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>busy</code></em> :</span></p></td>
<td>a pointer to hold whether the change is in
progress or has been completed. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-request-state"></a><h3>gst_message_new_request_state ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_request_state (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> state</code></em>);</pre>
<p>
This message can be posted by elements when they want to have their state
changed. A typical use case would be an audio server that wants to pause the
pipeline because a higher priority stream is being played.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>the object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>The new requested state</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new requst state message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-request-state"></a><h3>gst_message_parse_request_state ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_request_state (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html#GstState" title="enum GstState"><span class="type">GstState</span></a> *state</code></em>);</pre>
<p>
Extract the requested state from the request_state message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_REQUEST_STATE.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>state</code></em> :</span></p></td>
<td>Result location for the requested state or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstStreamStatusType"></a><h3>enum GstStreamStatusType</h3>
<pre class="programlisting">typedef enum {
GST_STREAM_STATUS_TYPE_CREATE = 0,
GST_STREAM_STATUS_TYPE_ENTER = 1,
GST_STREAM_STATUS_TYPE_LEAVE = 2,
GST_STREAM_STATUS_TYPE_DESTROY = 3,
GST_STREAM_STATUS_TYPE_START = 8,
GST_STREAM_STATUS_TYPE_PAUSE = 9,
GST_STREAM_STATUS_TYPE_STOP = 10
} GstStreamStatusType;
</pre>
<p>
The type of a <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-STREAM-STATUS:CAPS"><code class="literal">GST_MESSAGE_STREAM_STATUS</code></a>. The stream status messages inform the
application of new streaming threads and their status.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-CREATE:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_CREATE</code></span></p></td>
<td>A new thread need to be created.
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-ENTER:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_ENTER</code></span></p></td>
<td>a thread entered its loop function
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-LEAVE:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_LEAVE</code></span></p></td>
<td>a thread left its loop function
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-DESTROY:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_DESTROY</code></span></p></td>
<td>a thread is destroyed
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-START:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_START</code></span></p></td>
<td>a thread is started
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-PAUSE:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_PAUSE</code></span></p></td>
<td>a thread is paused
</td>
</tr>
<tr>
<td><p><a name="GST-STREAM-STATUS-TYPE-STOP:CAPS"></a><span class="term"><code class="literal">GST_STREAM_STATUS_TYPE_STOP</code></span></p></td>
<td>a thread is stopped
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-stream-status"></a><h3>gst_message_new_stream_status ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_stream_status (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStreamStatusType" title="enum GstStreamStatusType"><span class="type">GstStreamStatusType</span></a> type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> *owner</code></em>);</pre>
<p>
Create a new stream status message. This message is posted when a streaming
thread is created/destroyed or when the state changed.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>The stream status type.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>owner</code></em> :</span></p></td>
<td>the owner element of <em class="parameter"><code>src</code></em>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new stream status message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-stream-status"></a><h3>gst_message_parse_stream_status ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_stream_status (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstStreamStatusType" title="enum GstStreamStatusType"><span class="type">GstStreamStatusType</span></a> *type</code></em>,
<em class="parameter"><code><a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a> **owner</code></em>);</pre>
<p>
Extracts the stream status type and owner the GstMessage. The returned
owner remains valid for as long as the reference to <em class="parameter"><code>message</code></em> is valid and
should thus not be unreffed.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STREAM_STATUS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>A pointer to hold the status type. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>owner</code></em> :</span></p></td>
<td>The owner element of the message source. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-set-stream-status-object"></a><h3>gst_message_set_stream_status_object ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_set_stream_status_object
(<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="type">GValue</span></a> *object</code></em>);</pre>
<p>
Configures the object handling the streaming thread. This is usually a
GstTask object but other objects might be added in the future.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STREAM_STATUS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>the object controlling the streaming</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-get-stream-status-object"></a><h3>gst_message_get_stream_status_object ()</h3>
<pre class="programlisting">const <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Generic-values.html#GValue"><span class="returnvalue">GValue</span></a> * gst_message_get_stream_status_object
(<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>);</pre>
<p>
Extracts the object managing the streaming thread from <em class="parameter"><code>message</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_STREAM_STATUS.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a GValue containing the object that manages the streaming thread.
This object is usually of type GstTask but other types can be added in the
future. The object remains valid as long as <em class="parameter"><code>message</code></em> is valid.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstProgressType"></a><h3>enum GstProgressType</h3>
<pre class="programlisting">typedef enum {
GST_PROGRESS_TYPE_START = 0,
GST_PROGRESS_TYPE_CONTINUE = 1,
GST_PROGRESS_TYPE_COMPLETE = 2,
GST_PROGRESS_TYPE_CANCELED = 3,
GST_PROGRESS_TYPE_ERROR = 4
} GstProgressType;
</pre>
<p>
The type of a <a class="link" href="gstreamer-GstMessage.html#GST-MESSAGE-PROGRESS:CAPS"><code class="literal">GST_MESSAGE_PROGRESS</code></a>. The progress messages inform the
application of the status of assynchronous tasks.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-PROGRESS-TYPE-START:CAPS"></a><span class="term"><code class="literal">GST_PROGRESS_TYPE_START</code></span></p></td>
<td>A new task started.
</td>
</tr>
<tr>
<td><p><a name="GST-PROGRESS-TYPE-CONTINUE:CAPS"></a><span class="term"><code class="literal">GST_PROGRESS_TYPE_CONTINUE</code></span></p></td>
<td>A task completed and a new one continues.
</td>
</tr>
<tr>
<td><p><a name="GST-PROGRESS-TYPE-COMPLETE:CAPS"></a><span class="term"><code class="literal">GST_PROGRESS_TYPE_COMPLETE</code></span></p></td>
<td>A task completed.
</td>
</tr>
<tr>
<td><p><a name="GST-PROGRESS-TYPE-CANCELED:CAPS"></a><span class="term"><code class="literal">GST_PROGRESS_TYPE_CANCELED</code></span></p></td>
<td>A task was canceled.
</td>
</tr>
<tr>
<td><p><a name="GST-PROGRESS-TYPE-ERROR:CAPS"></a><span class="term"><code class="literal">GST_PROGRESS_TYPE_ERROR</code></span></p></td>
<td>A task caused an error. An error message is also
posted on the bus.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-progress"></a><h3>gst_message_new_progress ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_progress (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType"><span class="type">GstProgressType</span></a> type</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *code</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *text</code></em>);</pre>
<p>
Progress messages are posted by elements when they use an asynchronous task
to perform actions triggered by a state change.
</p>
<p>
<em class="parameter"><code>code</code></em> contains a well defined string describing the action.
<em class="parameter"><code>test</code></em> should contain a user visible string detailing the current action.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType"><span class="type">GstProgressType</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>a progress code</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>free, user visible text describing the progress</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new qos message. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-progress"></a><h3>gst_message_parse_progress ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_progress (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstProgressType" title="enum GstProgressType"><span class="type">GstProgressType</span></a> *type</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **code</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **text</code></em>);</pre>
<p>
Parses the progress <em class="parameter"><code>type</code></em>, <em class="parameter"><code>code</code></em> and <em class="parameter"><code>text</code></em>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_PROGRESS.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>location for the type. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>location for the code. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>location for the text. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-need-context"></a><h3>gst_message_new_need_context ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_need_context (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *context_type</code></em>);</pre>
<p>
This message is posted when an element needs a specific <a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>context_type</code></em> :</span></p></td>
<td>The context type that is needed</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new need-context message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-context-type"></a><h3>gst_message_parse_context_type ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> gst_message_parse_context_type (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code>const <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> **context_type</code></em>);</pre>
<p>
Parse a context type from an existing GST_MESSAGE_NEED_CONTEXT message.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>a GST_MESSAGE_NEED_CONTEXT type message</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>context_type</code></em> :</span></p></td>
<td>the context type, or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> indicating if the parsing succeeded.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-new-have-context"></a><h3>gst_message_new_have_context ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="returnvalue">GstMessage</span></a> * gst_message_new_have_context (<em class="parameter"><code><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> *src</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> *context</code></em>);</pre>
<p>
This message is posted when an element has a new local <a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>src</code></em> :</span></p></td>
<td>The object originating the message. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>the context. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The new have-context message.
MT safe. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-message-parse-have-context"></a><h3>gst_message_parse_have_context ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_message_parse_have_context (<em class="parameter"><code><a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> *message</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-GstContext.html#GstContext" title="GstContext"><span class="type">GstContext</span></a> **context</code></em>);</pre>
<p>
Extract the context from the HAVE_CONTEXT message.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>message</code></em> :</span></p></td>
<td>A valid <a class="link" href="gstreamer-GstMessage.html#GstMessage" title="struct GstMessage"><span class="type">GstMessage</span></a> of type GST_MESSAGE_HAVE_CONTEXT.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>Result location for the
context or NULL. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-GstMessage.see-also"></a><h2>See Also</h2>
<a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>, <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a>, <a class="link" href="GstElement.html" title="GstElement"><span class="type">GstElement</span></a>
</div>
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