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<a href="#GstClock.description" class="shortcut">Description</a>
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<a href="#GstClock.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a href="#GstClock.properties" class="shortcut">Properties</a>
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<h2><span class="refentrytitle"><a name="GstClock.top_of_page"></a>GstClock</span></h2>
<p>GstClock — Abstract class for global clocks</p>
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<a name="GstClock.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/gst.h>
struct <a class="link" href="GstClock.html#GstClock-struct" title="struct GstClock">GstClock</a>;
struct <a class="link" href="GstClock.html#GstClockClass" title="struct GstClockClass">GstClockClass</a>;
typedef <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime">GstClockTime</a>;
typedef <a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff">GstClockTimeDiff</a>;
typedef <a class="link" href="GstClock.html#GstClockID" title="GstClockID">GstClockID</a>;
#define <a class="link" href="GstClock.html#GST-CLOCK-TIME-NONE:CAPS" title="GST_CLOCK_TIME_NONE">GST_CLOCK_TIME_NONE</a>
#define <a class="link" href="GstClock.html#GST-CLOCK-TIME-IS-VALID:CAPS" title="GST_CLOCK_TIME_IS_VALID()">GST_CLOCK_TIME_IS_VALID</a> (time)
#define <a class="link" href="GstClock.html#GST-SECOND:CAPS" title="GST_SECOND">GST_SECOND</a>
#define <a class="link" href="GstClock.html#GST-MSECOND:CAPS" title="GST_MSECOND">GST_MSECOND</a>
#define <a class="link" href="GstClock.html#GST-USECOND:CAPS" title="GST_USECOND">GST_USECOND</a>
#define <a class="link" href="GstClock.html#GST-NSECOND:CAPS" title="GST_NSECOND">GST_NSECOND</a>
#define <a class="link" href="GstClock.html#GST-TIME-AS-SECONDS:CAPS" title="GST_TIME_AS_SECONDS()">GST_TIME_AS_SECONDS</a> (time)
#define <a class="link" href="GstClock.html#GST-TIME-AS-MSECONDS:CAPS" title="GST_TIME_AS_MSECONDS()">GST_TIME_AS_MSECONDS</a> (time)
#define <a class="link" href="GstClock.html#GST-TIME-AS-USECONDS:CAPS" title="GST_TIME_AS_USECONDS()">GST_TIME_AS_USECONDS</a> (time)
#define <a class="link" href="GstClock.html#GST-TIME-AS-NSECONDS:CAPS" title="GST_TIME_AS_NSECONDS()">GST_TIME_AS_NSECONDS</a> (time)
#define <a class="link" href="GstClock.html#GST-CLOCK-DIFF:CAPS" title="GST_CLOCK_DIFF()">GST_CLOCK_DIFF</a> (s,
e)
#define <a class="link" href="GstClock.html#GST-TIMEVAL-TO-TIME:CAPS" title="GST_TIMEVAL_TO_TIME()">GST_TIMEVAL_TO_TIME</a> (tv)
#define <a class="link" href="GstClock.html#GST-TIME-TO-TIMEVAL:CAPS" title="GST_TIME_TO_TIMEVAL()">GST_TIME_TO_TIMEVAL</a> (t,
tv)
#define <a class="link" href="GstClock.html#GST-TIMESPEC-TO-TIME:CAPS" title="GST_TIMESPEC_TO_TIME()">GST_TIMESPEC_TO_TIME</a> (ts)
#define <a class="link" href="GstClock.html#GST-TIME-TO-TIMESPEC:CAPS" title="GST_TIME_TO_TIMESPEC()">GST_TIME_TO_TIMESPEC</a> (t,
ts)
struct <a class="link" href="GstClock.html#GstClockEntry" title="struct GstClockEntry">GstClockEntry</a>;
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstClock.html#GstClockCallback" title="GstClockCallback ()">*GstClockCallback</a>) (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
enum <a class="link" href="GstClock.html#GstClockEntryType" title="enum GstClockEntryType">GstClockEntryType</a>;
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY:CAPS" title="GST_CLOCK_ENTRY()">GST_CLOCK_ENTRY</a> (entry)
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY-CLOCK:CAPS" title="GST_CLOCK_ENTRY_CLOCK()">GST_CLOCK_ENTRY_CLOCK</a> (entry)
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY-TYPE:CAPS" title="GST_CLOCK_ENTRY_TYPE()">GST_CLOCK_ENTRY_TYPE</a> (entry)
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY-TIME:CAPS" title="GST_CLOCK_ENTRY_TIME()">GST_CLOCK_ENTRY_TIME</a> (entry)
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY-INTERVAL:CAPS" title="GST_CLOCK_ENTRY_INTERVAL()">GST_CLOCK_ENTRY_INTERVAL</a> (entry)
#define <a class="link" href="GstClock.html#GST-CLOCK-ENTRY-STATUS:CAPS" title="GST_CLOCK_ENTRY_STATUS()">GST_CLOCK_ENTRY_STATUS</a> (entry)
enum <a class="link" href="GstClock.html#GstClockReturn" title="enum GstClockReturn">GstClockReturn</a>;
enum <a class="link" href="GstClock.html#GstClockFlags" title="enum GstClockFlags">GstClockFlags</a>;
#define <a class="link" href="GstClock.html#GST-CLOCK-FLAGS:CAPS" title="GST_CLOCK_FLAGS()">GST_CLOCK_FLAGS</a> (clock)
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="GstClock.html#gst-clock-add-observation" title="gst_clock_add_observation ()">gst_clock_add_observation</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> slave</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> master</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> *r_squared</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="GstClock.html#gst-clock-set-master" title="gst_clock_set_master ()">gst_clock_set_master</a> (<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 class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *master</code></em>);
<a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * <a class="link" href="GstClock.html#gst-clock-get-master" title="gst_clock_get_master ()">gst_clock_get_master</a> (<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="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-set-resolution" title="gst_clock_set_resolution ()">gst_clock_set_resolution</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> resolution</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-get-resolution" title="gst_clock_get_resolution ()">gst_clock_get_resolution</a> (<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="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()">gst_clock_get_time</a> (<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="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> <a class="link" href="GstClock.html#gst-clock-new-single-shot-id" title="gst_clock_new_single_shot_id ()">gst_clock_new_single_shot_id</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);
<a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> <a class="link" href="GstClock.html#gst-clock-new-periodic-id" title="gst_clock_new_periodic_id ()">gst_clock_new_periodic_id</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> start_time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> interval</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="GstClock.html#gst-clock-single-shot-id-reinit" title="gst_clock_single_shot_id_reinit ()">gst_clock_single_shot_id_reinit</a> (<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 class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</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="GstClock.html#gst-clock-periodic-id-reinit" title="gst_clock_periodic_id_reinit ()">gst_clock_periodic_id_reinit</a> (<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 class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> start_time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> interval</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-get-internal-time" title="gst_clock_get_internal_time ()">gst_clock_get_internal_time</a> (<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="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-adjust-unlocked" title="gst_clock_adjust_unlocked ()">gst_clock_adjust_unlocked</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> internal</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-unadjust-unlocked" title="gst_clock_unadjust_unlocked ()">gst_clock_unadjust_unlocked</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> external</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstClock.html#gst-clock-get-calibration" title="gst_clock_get_calibration ()">gst_clock_get_calibration</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *internal</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *external</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *rate_num</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *rate_denom</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstClock.html#gst-clock-set-calibration" title="gst_clock_set_calibration ()">gst_clock_set_calibration</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> internal</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> external</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> rate_num</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> rate_denom</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-get-timeout" title="gst_clock_get_timeout ()">gst_clock_get_timeout</a> (<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="GstClock.html#gst-clock-set-timeout" title="gst_clock_set_timeout ()">gst_clock_set_timeout</a> (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> timeout</code></em>);
<a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> <a class="link" href="GstClock.html#gst-clock-id-get-time" title="gst_clock_id_get_time ()">gst_clock_id_get_time</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);
<a class="link" href="GstClock.html#GstClockReturn" title="enum GstClockReturn"><span class="returnvalue">GstClockReturn</span></a> <a class="link" href="GstClock.html#gst-clock-id-wait" title="gst_clock_id_wait ()">gst_clock_id_wait</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> *jitter</code></em>);
<a class="link" href="GstClock.html#GstClockReturn" title="enum GstClockReturn"><span class="returnvalue">GstClockReturn</span></a> <a class="link" href="GstClock.html#gst-clock-id-wait-async" title="gst_clock_id_wait_async ()">gst_clock_id_wait_async</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockCallback" title="GstClockCallback ()"><span class="type">GstClockCallback</span></a> func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_data</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstClock.html#gst-clock-id-unschedule" title="gst_clock_id_unschedule ()">gst_clock_id_unschedule</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> <a class="link" href="GstClock.html#gst-clock-id-compare-func" title="gst_clock_id_compare_func ()">gst_clock_id_compare_func</a> (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> id1</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> id2</code></em>);
<a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> <a class="link" href="GstClock.html#gst-clock-id-ref" title="gst_clock_id_ref ()">gst_clock_id_ref</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstClock.html#gst-clock-id-unref" title="gst_clock_id_unref ()">gst_clock_id_unref</a> (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstClock.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
+----<a class="link" href="GstObject.html" title="GstObject">GstObject</a>
+----GstClock
+----<a class="link" href="GstSystemClock.html" title="GstSystemClock">GstSystemClock</a>
</pre>
</div>
<div class="refsect1">
<a name="GstClock.properties"></a><h2>Properties</h2>
<pre class="synopsis">
"<a class="link" href="GstClock.html#GstClock--timeout" title='The "timeout" property'>timeout</a>" <span class="type">guint64</span> : Read / Write
"<a class="link" href="GstClock.html#GstClock--window-size" title='The "window-size" property'>window-size</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
"<a class="link" href="GstClock.html#GstClock--window-threshold" title='The "window-threshold" property'>window-threshold</a>" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="GstClock.description"></a><h2>Description</h2>
<p>
GStreamer uses a global clock to synchronize the plugins in a pipeline.
Different clock implementations are possible by implementing this abstract
base class or, more conveniently, by subclassing <a class="link" href="GstSystemClock.html" title="GstSystemClock"><span class="type">GstSystemClock</span></a>.
</p>
<p>
The <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> returns a monotonically increasing time with the method
<a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a>. Its accuracy and base time depend on the specific
clock implementation but time is always expressed in nanoseconds. Since the
baseline of the clock is undefined, the clock time returned is not
meaningful in itself, what matters are the deltas between two clock times.
The time returned by a clock is called the absolute time.
</p>
<p>
The pipeline uses the clock to calculate the running time. Usually all
renderers synchronize to the global clock using the buffer timestamps, the
newsegment events and the element's base time, see <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>.
</p>
<p>
A clock implementation can support periodic and single shot clock
notifications both synchronous and asynchronous.
</p>
<p>
One first needs to create a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> for the periodic or single shot
notification using <a class="link" href="GstClock.html#gst-clock-new-single-shot-id" title="gst_clock_new_single_shot_id ()"><code class="function">gst_clock_new_single_shot_id()</code></a> or
<a class="link" href="GstClock.html#gst-clock-new-periodic-id" title="gst_clock_new_periodic_id ()"><code class="function">gst_clock_new_periodic_id()</code></a>.
</p>
<p>
To perform a blocking wait for the specific time of the <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> use the
<a class="link" href="GstClock.html#gst-clock-id-wait" title="gst_clock_id_wait ()"><code class="function">gst_clock_id_wait()</code></a>. To receive a callback when the specific time is reached
in the clock use <a class="link" href="GstClock.html#gst-clock-id-wait-async" title="gst_clock_id_wait_async ()"><code class="function">gst_clock_id_wait_async()</code></a>. Both these calls can be
interrupted with the <a class="link" href="GstClock.html#gst-clock-id-unschedule" title="gst_clock_id_unschedule ()"><code class="function">gst_clock_id_unschedule()</code></a> call. If the blocking wait is
unscheduled a return value of <a class="link" href="GstClock.html#GST-CLOCK-UNSCHEDULED:CAPS"><span class="type">GST_CLOCK_UNSCHEDULED</span></a> is returned.
</p>
<p>
Periodic callbacks scheduled async will be repeatedly called automatically
until it is unscheduled. To schedule a sync periodic callback,
<a class="link" href="GstClock.html#gst-clock-id-wait" title="gst_clock_id_wait ()"><code class="function">gst_clock_id_wait()</code></a> should be called repeatedly.
</p>
<p>
The async callbacks can happen from any thread, either provided by the core
or from a streaming thread. The application should be prepared for this.
</p>
<p>
A <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> that has been unscheduled cannot be used again for any wait
operation, a new <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> should be created and the old unscheduled one
should be destroyed with <a class="link" href="GstClock.html#gst-clock-id-unref" title="gst_clock_id_unref ()"><code class="function">gst_clock_id_unref()</code></a>.
</p>
<p>
It is possible to perform a blocking wait on the same <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> from
multiple threads. However, registering the same <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> for multiple
async notifications is not possible, the callback will only be called for
the thread registering the entry last.
</p>
<p>
None of the wait operations unref the <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a>, the owner is responsible
for unreffing the ids itself. This holds for both periodic and single shot
notifications. The reason being that the owner of the <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> has to
keep a handle to the <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to unblock the wait on FLUSHING events or
state changes and if the entry would be unreffed automatically, the handle
might become invalid without any notification.
</p>
<p>
These clock operations do not operate on the running time, so the callbacks
will also occur when not in PLAYING state as if the clock just keeps on
running. Some clocks however do not progress when the element that provided
the clock is not PLAYING.
</p>
<p>
When a clock has the <a class="link" href="GstClock.html#GST-CLOCK-FLAG-CAN-SET-MASTER:CAPS"><span class="type">GST_CLOCK_FLAG_CAN_SET_MASTER</span></a> flag set, it can be
slaved to another <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> with the <a class="link" href="GstClock.html#gst-clock-set-master" title="gst_clock_set_master ()"><code class="function">gst_clock_set_master()</code></a>. The clock will
then automatically be synchronized to this master clock by repeatedly
sampling the master clock and the slave clock and recalibrating the slave
clock with <a class="link" href="GstClock.html#gst-clock-set-calibration" title="gst_clock_set_calibration ()"><code class="function">gst_clock_set_calibration()</code></a>. This feature is mostly useful for
plugins that have an internal clock but must operate with another clock
selected by the <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>. They can track the offset and rate difference
of their internal clock relative to the master clock by using the
<a class="link" href="GstClock.html#gst-clock-get-calibration" title="gst_clock_get_calibration ()"><code class="function">gst_clock_get_calibration()</code></a> function.
</p>
<p>
The master/slave synchronisation can be tuned with the <a class="link" href="GstClock.html#GstClock--timeout" title='The "timeout" property'><span class="type">"timeout"</span></a>,
<a class="link" href="GstClock.html#GstClock--window-size" title='The "window-size" property'><span class="type">"window-size"</span></a> and <a class="link" href="GstClock.html#GstClock--window-threshold" title='The "window-threshold" property'><span class="type">"window-threshold"</span></a> properties.
The <a class="link" href="GstClock.html#GstClock--timeout" title='The "timeout" property'><span class="type">"timeout"</span></a> property defines the interval to sample the master
clock and run the calibration functions. <a class="link" href="GstClock.html#GstClock--window-size" title='The "window-size" property'><span class="type">"window-size"</span></a> defines the
number of samples to use when calibrating and <a class="link" href="GstClock.html#GstClock--window-threshold" title='The "window-threshold" property'><span class="type">"window-threshold"</span></a>
defines the minimum number of samples before the calibration is performed.
</p>
<p>
Last reviewed on 2012-03-28 (0.11.3)
</p>
</div>
<div class="refsect1">
<a name="GstClock.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstClock-struct"></a><h3>struct GstClock</h3>
<pre class="programlisting">struct GstClock;</pre>
<p>
<a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> base structure. The values of this structure are
protected for subclasses, use the methods to use the <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstClockClass"></a><h3>struct GstClockClass</h3>
<pre class="programlisting">struct GstClockClass {
GstObjectClass parent_class;
/* vtable */
GstClockTime (*change_resolution) (GstClock *clock,
GstClockTime old_resolution,
GstClockTime new_resolution);
GstClockTime (*get_resolution) (GstClock *clock);
GstClockTime (*get_internal_time) (GstClock *clock);
/* waiting on an ID */
GstClockReturn (*wait) (GstClock *clock, GstClockEntry *entry,
GstClockTimeDiff *jitter);
GstClockReturn (*wait_async) (GstClock *clock, GstClockEntry *entry);
void (*unschedule) (GstClock *clock, GstClockEntry *entry);
};
</pre>
<p>
GStreamer clock class. Override the vmethods to implement the clock
functionality.
</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="GstObject.html#GstObjectClass" title="struct GstObjectClass"><span class="type">GstObjectClass</span></a> <em class="structfield"><code><a name="GstClockClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>the parent class structure</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.change-resolution"></a>change_resolution</code></em> ()</span></p></td>
<td>change the resolution of the clock. Not all values might
be acceptable. The new resolution should be returned.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.get-resolution"></a>get_resolution</code></em> ()</span></p></td>
<td>get the resolution of the clock.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.get-internal-time"></a>get_internal_time</code></em> ()</span></p></td>
<td>get the internal unadjusted time of the clock.
implement <em class="parameter"><code>wait_jitter</code></em> instead.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.wait"></a>wait</code></em> ()</span></p></td>
<td>perform a blocking wait on the given <a class="link" href="GstClock.html#GstClockEntry" title="struct GstClockEntry"><span class="type">GstClockEntry</span></a> and return
the jitter.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.wait-async"></a>wait_async</code></em> ()</span></p></td>
<td>perform an asynchronous wait for the given <a class="link" href="GstClock.html#GstClockEntry" title="struct GstClockEntry"><span class="type">GstClockEntry</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstClockClass.unschedule"></a>unschedule</code></em> ()</span></p></td>
<td>unblock a blocking or async wait operation.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockTime"></a><h3>GstClockTime</h3>
<pre class="programlisting">typedef guint64 GstClockTime;
</pre>
<p>
A datatype to hold a time, measured in nanoseconds.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstClockTimeDiff"></a><h3>GstClockTimeDiff</h3>
<pre class="programlisting">typedef gint64 GstClockTimeDiff;
</pre>
<p>
A datatype to hold a time difference, measured in nanoseconds.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstClockID"></a><h3>GstClockID</h3>
<pre class="programlisting">typedef gpointer GstClockID;
</pre>
<p>
A datatype to hold the handle to an outstanding sync or async clock callback.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-TIME-NONE:CAPS"></a><h3>GST_CLOCK_TIME_NONE</h3>
<pre class="programlisting">#define GST_CLOCK_TIME_NONE ((GstClockTime) -1)
</pre>
<p>
Constant to define an undefined clock time.
</p>
<p>
Value: 18446744073709551615
Type: GstClockTime
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-TIME-IS-VALID:CAPS"></a><h3>GST_CLOCK_TIME_IS_VALID()</h3>
<pre class="programlisting">#define GST_CLOCK_TIME_IS_VALID(time) (((GstClockTime)(time)) != GST_CLOCK_TIME_NONE)
</pre>
<p>
Tests if a given <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> represents a valid defined time.
</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>time</code></em> :</span></p></td>
<td>clock time to validate</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-SECOND:CAPS"></a><h3>GST_SECOND</h3>
<pre class="programlisting">#define GST_SECOND (G_USEC_PER_SEC * G_GINT64_CONSTANT (1000))
</pre>
<p>
Constant that defines one GStreamer second.
</p>
<p>
Value: 1000000000
Type: GstClockTime
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-MSECOND:CAPS"></a><h3>GST_MSECOND</h3>
<pre class="programlisting">#define GST_MSECOND (GST_SECOND / G_GINT64_CONSTANT (1000))
</pre>
<p>
Constant that defines one GStreamer millisecond.
</p>
<p>
Value: 1000000
Type: GstClockTime
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-USECOND:CAPS"></a><h3>GST_USECOND</h3>
<pre class="programlisting">#define GST_USECOND (GST_SECOND / G_GINT64_CONSTANT (1000000))
</pre>
<p>
Constant that defines one GStreamer microsecond.
</p>
<p>
Value: 1000
Type: GstClockTime
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-NSECOND:CAPS"></a><h3>GST_NSECOND</h3>
<pre class="programlisting">#define GST_NSECOND (GST_SECOND / G_GINT64_CONSTANT (1000000000))
</pre>
<p>
Constant that defines one GStreamer nanosecond
</p>
<p>
Value: 1
Type: GstClockTime
</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-AS-SECONDS:CAPS"></a><h3>GST_TIME_AS_SECONDS()</h3>
<pre class="programlisting">#define GST_TIME_AS_SECONDS(time) ((time) / GST_SECOND)
</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to seconds.
</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>time</code></em> :</span></p></td>
<td>the time</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-AS-MSECONDS:CAPS"></a><h3>GST_TIME_AS_MSECONDS()</h3>
<pre class="programlisting">#define GST_TIME_AS_MSECONDS(time) ((time) / G_GINT64_CONSTANT (1000000))
</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to milliseconds (1/1000 of a second).
</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>time</code></em> :</span></p></td>
<td>the time</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-AS-USECONDS:CAPS"></a><h3>GST_TIME_AS_USECONDS()</h3>
<pre class="programlisting">#define GST_TIME_AS_USECONDS(time) ((time) / G_GINT64_CONSTANT (1000))
</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to microseconds (1/1000000 of a second).
</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>time</code></em> :</span></p></td>
<td>the time</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-AS-NSECONDS:CAPS"></a><h3>GST_TIME_AS_NSECONDS()</h3>
<pre class="programlisting">#define GST_TIME_AS_NSECONDS(time) (time)
</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to nanoseconds (1/1000000000 of a second).
</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>time</code></em> :</span></p></td>
<td>the time</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-DIFF:CAPS"></a><h3>GST_CLOCK_DIFF()</h3>
<pre class="programlisting">#define GST_CLOCK_DIFF(s, e) (GstClockTimeDiff)((e) - (s))
</pre>
<p>
Calculate a difference between two clock times as a <a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a>.
The difference is calculated as <em class="parameter"><code>e</code></em> - <em class="parameter"><code>s</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>s</code></em> :</span></p></td>
<td>the first time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>e</code></em> :</span></p></td>
<td>the second time</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIMEVAL-TO-TIME:CAPS"></a><h3>GST_TIMEVAL_TO_TIME()</h3>
<pre class="programlisting">#define GST_TIMEVAL_TO_TIME(tv) (GstClockTime)((tv).tv_sec * GST_SECOND + (tv).tv_usec * GST_USECOND)
</pre>
<p>
Convert a <a href="http://library.gnome.org/devel/glib/unstable/glib-Date-and-Time-Functions.html#GTimeVal"><span class="type">GTimeVal</span></a> to a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</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>tv</code></em> :</span></p></td>
<td>the timeval to convert</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-TO-TIMEVAL:CAPS"></a><h3>GST_TIME_TO_TIMEVAL()</h3>
<pre class="programlisting">#define GST_TIME_TO_TIMEVAL(t,tv)</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to a <a href="http://library.gnome.org/devel/glib/unstable/glib-Date-and-Time-Functions.html#GTimeVal"><span class="type">GTimeVal</span></a>
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>on 32-bit systems, a timeval has a range of only 2^32 - 1 seconds,
which is about 68 years. Expect trouble if you want to schedule stuff
in your pipeline for 2038.</div>
<p>
</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>t</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tv</code></em> :</span></p></td>
<td>The target timeval</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIMESPEC-TO-TIME:CAPS"></a><h3>GST_TIMESPEC_TO_TIME()</h3>
<pre class="programlisting">#define GST_TIMESPEC_TO_TIME(ts) (GstClockTime)((ts).tv_sec * GST_SECOND + (ts).tv_nsec * GST_NSECOND)
</pre>
<p>
Convert a struct timespec (see man pselect) to a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</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>ts</code></em> :</span></p></td>
<td>the timespec to convert</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-TIME-TO-TIMESPEC:CAPS"></a><h3>GST_TIME_TO_TIMESPEC()</h3>
<pre class="programlisting">#define GST_TIME_TO_TIMESPEC(t,ts)</pre>
<p>
Convert a <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to a struct timespec (see man pselect)
</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>t</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> to convert</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ts</code></em> :</span></p></td>
<td>The target timespec</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockEntry"></a><h3>struct GstClockEntry</h3>
<pre class="programlisting">struct GstClockEntry {
gint refcount;
};
</pre>
<p>
All pending timeouts or periodic notifies are converted into
an entry.
Note that GstClockEntry should be treated as an opaque structure. It must
not be extended or allocated using a custom allocator.
</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 href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstClockEntry.refcount"></a>refcount</code></em>;</span></p></td>
<td>reference counter (read-only)</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockCallback"></a><h3>GstClockCallback ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstClockCallback) (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
The function prototype of the callback.
</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>clock</code></em> :</span></p></td>
<td>The clock that triggered the callback</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>The time it was triggered</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> that expired</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed in the <a class="link" href="GstClock.html#gst-clock-id-wait-async" title="gst_clock_id_wait_async ()"><code class="function">gst_clock_id_wait_async()</code></a> function</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> or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> (currently unused)</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockEntryType"></a><h3>enum GstClockEntryType</h3>
<pre class="programlisting">typedef enum {
GST_CLOCK_ENTRY_SINGLE,
GST_CLOCK_ENTRY_PERIODIC
} GstClockEntryType;
</pre>
<p>
The type of the clock entry
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-CLOCK-ENTRY-SINGLE:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_ENTRY_SINGLE</code></span></p></td>
<td>a single shot timeout
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-ENTRY-PERIODIC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_ENTRY_PERIODIC</code></span></p></td>
<td>a periodic timeout request
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY:CAPS"></a><h3>GST_CLOCK_ENTRY()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY(entry) ((GstClockEntry *)(entry))
</pre>
<p>
Cast to a clock entry
</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>entry</code></em> :</span></p></td>
<td>the entry to cast</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY-CLOCK:CAPS"></a><h3>GST_CLOCK_ENTRY_CLOCK()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY_CLOCK(entry) ((entry)->clock)
</pre>
<p>
Get the owner clock of the entry
</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>entry</code></em> :</span></p></td>
<td>the entry to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY-TYPE:CAPS"></a><h3>GST_CLOCK_ENTRY_TYPE()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY_TYPE(entry) ((entry)->type)
</pre>
<p>
Get the type of the clock entry
</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>entry</code></em> :</span></p></td>
<td>the entry to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY-TIME:CAPS"></a><h3>GST_CLOCK_ENTRY_TIME()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY_TIME(entry) ((entry)->time)
</pre>
<p>
Get the requested time of this entry
</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>entry</code></em> :</span></p></td>
<td>the entry to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY-INTERVAL:CAPS"></a><h3>GST_CLOCK_ENTRY_INTERVAL()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY_INTERVAL(entry) ((entry)->interval)
</pre>
<p>
Get the interval of this periodic entry
</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>entry</code></em> :</span></p></td>
<td>the entry to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-ENTRY-STATUS:CAPS"></a><h3>GST_CLOCK_ENTRY_STATUS()</h3>
<pre class="programlisting">#define GST_CLOCK_ENTRY_STATUS(entry) ((entry)->status)
</pre>
<p>
The status of the entry
</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>entry</code></em> :</span></p></td>
<td>the entry to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockReturn"></a><h3>enum GstClockReturn</h3>
<pre class="programlisting">typedef enum {
GST_CLOCK_OK = 0,
GST_CLOCK_EARLY = 1,
GST_CLOCK_UNSCHEDULED = 2,
GST_CLOCK_BUSY = 3,
GST_CLOCK_BADTIME = 4,
GST_CLOCK_ERROR = 5,
GST_CLOCK_UNSUPPORTED = 6,
GST_CLOCK_DONE = 7
} GstClockReturn;
</pre>
<p>
The return value of a clock operation.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-CLOCK-OK:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_OK</code></span></p></td>
<td>The operation succeeded.
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-EARLY:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_EARLY</code></span></p></td>
<td>The operation was scheduled too late.
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-UNSCHEDULED:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_UNSCHEDULED</code></span></p></td>
<td>The clockID was unscheduled
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-BUSY:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_BUSY</code></span></p></td>
<td>The ClockID is busy
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-BADTIME:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_BADTIME</code></span></p></td>
<td>A bad time was provided to a function.
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-ERROR:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_ERROR</code></span></p></td>
<td>An error occurred
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-UNSUPPORTED:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_UNSUPPORTED</code></span></p></td>
<td>Operation is not supported
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-DONE:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_DONE</code></span></p></td>
<td>The ClockID is done waiting
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstClockFlags"></a><h3>enum GstClockFlags</h3>
<pre class="programlisting">typedef enum {
GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC = (GST_OBJECT_FLAG_LAST << 0),
GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC = (GST_OBJECT_FLAG_LAST << 1),
GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC = (GST_OBJECT_FLAG_LAST << 2),
GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC = (GST_OBJECT_FLAG_LAST << 3),
GST_CLOCK_FLAG_CAN_SET_RESOLUTION = (GST_OBJECT_FLAG_LAST << 4),
GST_CLOCK_FLAG_CAN_SET_MASTER = (GST_OBJECT_FLAG_LAST << 5),
/* padding */
GST_CLOCK_FLAG_LAST = (GST_OBJECT_FLAG_LAST << 8)
} GstClockFlags;
</pre>
<p>
The capabilities of this clock
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-DO-SINGLE-SYNC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_DO_SINGLE_SYNC</code></span></p></td>
<td>clock can do a single sync timeout request
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-DO-SINGLE-ASYNC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_DO_SINGLE_ASYNC</code></span></p></td>
<td>clock can do a single async timeout request
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-DO-PERIODIC-SYNC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_DO_PERIODIC_SYNC</code></span></p></td>
<td>clock can do sync periodic timeout requests
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-DO-PERIODIC-ASYNC:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_DO_PERIODIC_ASYNC</code></span></p></td>
<td>clock can do async periodic timeout callbacks
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-SET-RESOLUTION:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_SET_RESOLUTION</code></span></p></td>
<td>clock's resolution can be changed
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-CAN-SET-MASTER:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_CAN_SET_MASTER</code></span></p></td>
<td>clock can be slaved to a master clock
</td>
</tr>
<tr>
<td><p><a name="GST-CLOCK-FLAG-LAST:CAPS"></a><span class="term"><code class="literal">GST_CLOCK_FLAG_LAST</code></span></p></td>
<td>subclasses can add additional flags starting from this flag
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-CLOCK-FLAGS:CAPS"></a><h3>GST_CLOCK_FLAGS()</h3>
<pre class="programlisting">#define GST_CLOCK_FLAGS(clock) GST_OBJECT_FLAGS(clock)
</pre>
<p>
Gets the <a class="link" href="GstClock.html#GstClockFlags" title="enum GstClockFlags"><span class="type">GstClockFlags</span></a> clock flags.
</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>clock</code></em> :</span></p></td>
<td>the clock to query</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-add-observation"></a><h3>gst_clock_add_observation ()</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_clock_add_observation (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> slave</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> master</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> *r_squared</code></em>);</pre>
<p>
The time <em class="parameter"><code>master</code></em> of the master clock and the time <em class="parameter"><code>slave</code></em> of the slave
clock are added to the list of observations. If enough observations
are available, a linear regression algorithm is run on the
observations and <em class="parameter"><code>clock</code></em> is recalibrated.
</p>
<p>
If this functions returns <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, <em class="parameter"><code>r_squared</code></em> will contain the
correlation coefficient of the interpolation. A value of 1.0
means a perfect regression was performed. This value can
be used to control the sampling frequency of the master and slave
clocks.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>slave</code></em> :</span></p></td>
<td>a time on the slave</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>master</code></em> :</span></p></td>
<td>a time on the master</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>r_squared</code></em> :</span></p></td>
<td>a pointer to hold the result. <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"><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 enough observations were added to run the
regression algorithm.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-set-master"></a><h3>gst_clock_set_master ()</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_clock_set_master (<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 class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *master</code></em>);</pre>
<p>
Set <em class="parameter"><code>master</code></em> as the master clock for <em class="parameter"><code>clock</code></em>. <em class="parameter"><code>clock</code></em> will be automatically
calibrated so that <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a> reports the same time as the
master clock.
</p>
<p>
A clock provider that slaves its clock to a master can get the current
calibration values with <a class="link" href="GstClock.html#gst-clock-get-calibration" title="gst_clock_get_calibration ()"><code class="function">gst_clock_get_calibration()</code></a>.
</p>
<p>
<em class="parameter"><code>master</code></em> can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in which case <em class="parameter"><code>clock</code></em> will not be slaved anymore. It will
however keep reporting its time adjusted with the last configured rate
and time offsets.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>master</code></em> :</span></p></td>
<td>a master <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>. <span class="annotation">[<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 clock is capable of being slaved to a master clock.
Trying to set a master on a clock without the
<a class="link" href="GstClock.html#GST-CLOCK-FLAG-CAN-SET-MASTER:CAPS"><span class="type">GST_CLOCK_FLAG_CAN_SET_MASTER</span></a> flag will make this function return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-master"></a><h3>gst_clock_get_master ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html" title="GstClock"><span class="returnvalue">GstClock</span></a> * gst_clock_get_master (<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Get the master clock that <em class="parameter"><code>clock</code></em> is slaved to or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when the clock is
not slaved to any master clock.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a master <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> or <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when this clock is
not slaved to a master clock. Unref after usage.
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-clock-set-resolution"></a><h3>gst_clock_set_resolution ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_set_resolution (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> resolution</code></em>);</pre>
<p>
Set the accuracy of the clock. Some clocks have the possibility to operate
with different accuracy at the expense of more resource usage. There is
normally no need to change the default resolution of a clock. The resolution
of a clock can only be changed if the clock has the
<a class="link" href="GstClock.html#GST-CLOCK-FLAG-CAN-SET-RESOLUTION:CAPS"><span class="type">GST_CLOCK_FLAG_CAN_SET_RESOLUTION</span></a> flag 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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>resolution</code></em> :</span></p></td>
<td>The resolution to set</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the new resolution of the clock.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-resolution"></a><h3>gst_clock_get_resolution ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_get_resolution (<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Get the accuracy of the clock. The accuracy of the clock is the granularity
of the values returned by <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the resolution of the clock in units of <a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a>.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-time"></a><h3>gst_clock_get_time ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_get_time (<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Gets the current time of the given clock. The time is always
monotonically increasing and adjusted according to the current
offset and rate.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the time of the clock. Or GST_CLOCK_TIME_NONE when
given invalid input.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-new-single-shot-id"></a><h3>gst_clock_new_single_shot_id ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> gst_clock_new_single_shot_id (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Get a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> from <em class="parameter"><code>clock</code></em> to trigger a single shot
notification at the requested time. The single shot id should be
unreffed after usage.
</p>
<p>
Free-function: gst_clock_id_unref
</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>clock</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to get a single shot notification from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>the requested time</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> that can be used to request the
time notification.
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-clock-new-periodic-id"></a><h3>gst_clock_new_periodic_id ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> gst_clock_new_periodic_id (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> start_time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> interval</code></em>);</pre>
<p>
Get an ID from <em class="parameter"><code>clock</code></em> to trigger a periodic notification.
The periodic notifications will start at time <em class="parameter"><code>start_time</code></em> and
will then be fired with the given <em class="parameter"><code>interval</code></em>. <em class="parameter"><code>id</code></em> should be unreffed
after usage.
</p>
<p>
Free-function: gst_clock_id_unref
</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>clock</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to get a periodic notification id from</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_time</code></em> :</span></p></td>
<td>the requested start time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interval</code></em> :</span></p></td>
<td>the requested interval</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> that can be used to request the
time notification.
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-clock-single-shot-id-reinit"></a><h3>gst_clock_single_shot_id_reinit ()</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_clock_single_shot_id_reinit (<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 class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Reinitializes the provided single shot <em class="parameter"><code>id</code></em> to the provided time. Does not
modify the reference count.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>The requested time.</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 GstClockID could be reinitialized to the provided
<em class="parameter"><code>time</code></em>, else <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-periodic-id-reinit"></a><h3>gst_clock_periodic_id_reinit ()</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_clock_periodic_id_reinit (<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 class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> start_time</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> interval</code></em>);</pre>
<p>
Reinitializes the provided periodic <em class="parameter"><code>id</code></em> to the provided start time and
interval. Does not modify the reference count.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>start_time</code></em> :</span></p></td>
<td>the requested start time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>interval</code></em> :</span></p></td>
<td>the requested interval</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 GstClockID could be reinitialized to the provided
<em class="parameter"><code>time</code></em>, else <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-internal-time"></a><h3>gst_clock_get_internal_time ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_get_internal_time (<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Gets the current internal time of the given clock. The time is returned
unadjusted for the offset and the rate.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the internal time of the clock. Or GST_CLOCK_TIME_NONE when
given invalid input.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-adjust-unlocked"></a><h3>gst_clock_adjust_unlocked ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_adjust_unlocked (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> internal</code></em>);</pre>
<p>
Converts the given <em class="parameter"><code>internal</code></em> clock time to the external time, adjusting for the
rate and reference time set with <a class="link" href="GstClock.html#gst-clock-set-calibration" title="gst_clock_set_calibration ()"><code class="function">gst_clock_set_calibration()</code></a> and making sure
that the returned time is increasing. This function should be called with the
clock's OBJECT_LOCK held and is mainly used by clock subclasses.
</p>
<p>
This function is the reverse of <a class="link" href="GstClock.html#gst-clock-unadjust-unlocked" title="gst_clock_unadjust_unlocked ()"><code class="function">gst_clock_unadjust_unlocked()</code></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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal</code></em> :</span></p></td>
<td>a clock time</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the converted time of the clock.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-unadjust-unlocked"></a><h3>gst_clock_unadjust_unlocked ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_unadjust_unlocked (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> external</code></em>);</pre>
<p>
Converts the given <em class="parameter"><code>external</code></em> clock time to the internal time of <em class="parameter"><code>clock</code></em>,
using the rate and reference time set with <a class="link" href="GstClock.html#gst-clock-set-calibration" title="gst_clock_set_calibration ()"><code class="function">gst_clock_set_calibration()</code></a>.
This function should be called with the clock's OBJECT_LOCK held and
is mainly used by clock subclasses.
</p>
<p>
This function is the reverse of <a class="link" href="GstClock.html#gst-clock-adjust-unlocked" title="gst_clock_adjust_unlocked ()"><code class="function">gst_clock_adjust_unlocked()</code></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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>external</code></em> :</span></p></td>
<td>an external clock time</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the internal time of the clock corresponding to <em class="parameter"><code>external</code></em>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-calibration"></a><h3>gst_clock_get_calibration ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_clock_get_calibration (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *internal</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *external</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *rate_num</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> *rate_denom</code></em>);</pre>
<p>
Gets the internal rate and reference time of <em class="parameter"><code>clock</code></em>. See
<a class="link" href="GstClock.html#gst-clock-set-calibration" title="gst_clock_set_calibration ()"><code class="function">gst_clock_set_calibration()</code></a> for more information.
</p>
<p>
<em class="parameter"><code>internal</code></em>, <em class="parameter"><code>external</code></em>, <em class="parameter"><code>rate_num</code></em>, and <em class="parameter"><code>rate_denom</code></em> can be left <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the
caller is not interested in the 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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal</code></em> :</span></p></td>
<td>a location to store the internal time. <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>external</code></em> :</span></p></td>
<td>a location to store the external time. <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_num</code></em> :</span></p></td>
<td>a location to store the rate numerator. <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_denom</code></em> :</span></p></td>
<td>a location to store the rate denominator. <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-clock-set-calibration"></a><h3>gst_clock_set_calibration ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_clock_set_calibration (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> internal</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> external</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> rate_num</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> rate_denom</code></em>);</pre>
<p>
Adjusts the rate and time of <em class="parameter"><code>clock</code></em>. A rate of 1/1 is the normal speed of
the clock. Values bigger than 1/1 make the clock go faster.
</p>
<p>
<em class="parameter"><code>internal</code></em> and <em class="parameter"><code>external</code></em> are calibration parameters that arrange that
<a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a> should have been <em class="parameter"><code>external</code></em> at internal time <em class="parameter"><code>internal</code></em>.
This internal time should not be in the future; that is, it should be less
than the value of <a class="link" href="GstClock.html#gst-clock-get-internal-time" title="gst_clock_get_internal_time ()"><code class="function">gst_clock_get_internal_time()</code></a> when this function is called.
</p>
<p>
Subsequent calls to <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a> will return clock times computed as
follows:
</p>
<p>
</p>
<pre class="programlisting">
time = (internal_time - internal) * rate_num / rate_denom + external
</pre>
<p>
</p>
<p>
This formula is implemented in <a class="link" href="GstClock.html#gst-clock-adjust-unlocked" title="gst_clock_adjust_unlocked ()"><code class="function">gst_clock_adjust_unlocked()</code></a>. Of course, it
tries to do the integer arithmetic as precisely as possible.
</p>
<p>
Note that <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a> always returns increasing values so when you
move the clock backwards, <a class="link" href="GstClock.html#gst-clock-get-time" title="gst_clock_get_time ()"><code class="function">gst_clock_get_time()</code></a> will report the previous value
until the clock catches up.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> to calibrate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal</code></em> :</span></p></td>
<td>a reference internal time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>external</code></em> :</span></p></td>
<td>a reference external time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate_num</code></em> :</span></p></td>
<td>the numerator of the rate of the clock relative to its
internal time</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rate_denom</code></em> :</span></p></td>
<td>the denominator of the rate of the clock</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-get-timeout"></a><h3>gst_clock_get_timeout ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_get_timeout (<em class="parameter"><code><a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Get the amount of time that master and slave clocks are sampled.
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the interval between samples.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-set-timeout"></a><h3>gst_clock_set_timeout ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_clock_set_timeout (<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 class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="type">GstClockTime</span></a> timeout</code></em>);</pre>
<p>
Set the amount of time, in nanoseconds, to sample master and slave
clocks
</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>clock</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html" title="GstClock"><span class="type">GstClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timeout</code></em> :</span></p></td>
<td>a timeout</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-get-time"></a><h3>gst_clock_id_get_time ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockTime" title="GstClockTime"><span class="returnvalue">GstClockTime</span></a> gst_clock_id_get_time (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);</pre>
<p>
Get the time of the clock ID
</p>
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<col align="left" valign="top">
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</colgroup>
<tbody>
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<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the time of the given clock id.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-wait"></a><h3>gst_clock_id_wait ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockReturn" title="enum GstClockReturn"><span class="returnvalue">GstClockReturn</span></a> gst_clock_id_wait (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockTimeDiff" title="GstClockTimeDiff"><span class="type">GstClockTimeDiff</span></a> *jitter</code></em>);</pre>
<p>
Perform a blocking wait on <em class="parameter"><code>id</code></em>.
<em class="parameter"><code>id</code></em> should have been created with <a class="link" href="GstClock.html#gst-clock-new-single-shot-id" title="gst_clock_new_single_shot_id ()"><code class="function">gst_clock_new_single_shot_id()</code></a>
or <a class="link" href="GstClock.html#gst-clock-new-periodic-id" title="gst_clock_new_periodic_id ()"><code class="function">gst_clock_new_periodic_id()</code></a> and should not have been unscheduled
with a call to <a class="link" href="GstClock.html#gst-clock-id-unschedule" title="gst_clock_id_unschedule ()"><code class="function">gst_clock_id_unschedule()</code></a>.
</p>
<p>
If the <em class="parameter"><code>jitter</code></em> argument is not <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> and this function returns <a class="link" href="GstClock.html#GST-CLOCK-OK:CAPS"><span class="type">GST_CLOCK_OK</span></a>
or <a class="link" href="GstClock.html#GST-CLOCK-EARLY:CAPS"><span class="type">GST_CLOCK_EARLY</span></a>, it will contain the difference
against the clock and the time of <em class="parameter"><code>id</code></em> when this method was
called.
Positive values indicate how late <em class="parameter"><code>id</code></em> was relative to the clock
(in which case this function will return <a class="link" href="GstClock.html#GST-CLOCK-EARLY:CAPS"><span class="type">GST_CLOCK_EARLY</span></a>).
Negative values indicate how much time was spent waiting on the clock
before this function returned.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
<col>
</colgroup>
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<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to wait on</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>jitter</code></em> :</span></p></td>
<td>a pointer that will contain the jitter,
can be <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. <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>the result of the blocking wait. <a class="link" href="GstClock.html#GST-CLOCK-EARLY:CAPS"><span class="type">GST_CLOCK_EARLY</span></a> will be returned
if the current clock time is past the time of <em class="parameter"><code>id</code></em>, <a class="link" href="GstClock.html#GST-CLOCK-OK:CAPS"><span class="type">GST_CLOCK_OK</span></a> if
<em class="parameter"><code>id</code></em> was scheduled in time. <a class="link" href="GstClock.html#GST-CLOCK-UNSCHEDULED:CAPS"><span class="type">GST_CLOCK_UNSCHEDULED</span></a> if <em class="parameter"><code>id</code></em> was
unscheduled with <a class="link" href="GstClock.html#gst-clock-id-unschedule" title="gst_clock_id_unschedule ()"><code class="function">gst_clock_id_unschedule()</code></a>.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-wait-async"></a><h3>gst_clock_id_wait_async ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockReturn" title="enum GstClockReturn"><span class="returnvalue">GstClockReturn</span></a> gst_clock_id_wait_async (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>,
<em class="parameter"><code><a class="link" href="GstClock.html#GstClockCallback" title="GstClockCallback ()"><span class="type">GstClockCallback</span></a> func</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_data</code></em>);</pre>
<p>
Register a callback on the given <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> <em class="parameter"><code>id</code></em> with the given
function and user_data. When passing a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> with an invalid
time to this function, the callback will be called immediately
with a time set to GST_CLOCK_TIME_NONE. The callback will
be called when the time of <em class="parameter"><code>id</code></em> has been reached.
</p>
<p>
The callback <em class="parameter"><code>func</code></em> can be invoked from any thread, either provided by the
core or from a streaming thread. The application should be prepared for this.
</p>
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<colgroup>
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<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>id</code></em> :</span></p></td>
<td>a <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to wait on</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>The callback function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>User data passed in the callback</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy_data</code></em> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> for user_data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the result of the non blocking wait.
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-unschedule"></a><h3>gst_clock_id_unschedule ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_clock_id_unschedule (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);</pre>
<p>
Cancel an outstanding request with <em class="parameter"><code>id</code></em>. This can either
be an outstanding async notification or a pending sync notification.
After this call, <em class="parameter"><code>id</code></em> cannot be used anymore to receive sync or
async notifications, you need to create a new <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></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>id</code></em> :</span></p></td>
<td>The id to unschedule</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-compare-func"></a><h3>gst_clock_id_compare_func ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> gst_clock_id_compare_func (<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> id1</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> id2</code></em>);</pre>
<p>
Compares the two <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> instances. This function can be used
as a GCompareFunc when sorting ids.
</p>
<div class="variablelist"><table border="0" class="variablelist">
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<col align="left" valign="top">
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</colgroup>
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<tr>
<td><p><span class="term"><em class="parameter"><code>id1</code></em> :</span></p></td>
<td>A <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>id2</code></em> :</span></p></td>
<td>A <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to compare with</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>negative value if a < b; zero if a = b; positive value if a > b
MT safe.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-clock-id-ref"></a><h3>gst_clock_id_ref ()</h3>
<pre class="programlisting"><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="returnvalue">GstClockID</span></a> gst_clock_id_ref (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);</pre>
<p>
Increase the refcount of given <em class="parameter"><code>id</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>id</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to ref</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The same <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> with increased refcount.
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-clock-id-unref"></a><h3>gst_clock_id_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_clock_id_unref (<em class="parameter"><code><a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> id</code></em>);</pre>
<p>
Unref given <em class="parameter"><code>id</code></em>. When the refcount reaches 0 the
<a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> will be 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>id</code></em> :</span></p></td>
<td>The <a class="link" href="GstClock.html#GstClockID" title="GstClockID"><span class="type">GstClockID</span></a> to unref. <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>
</div>
<div class="refsect1">
<a name="GstClock.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstClock--timeout"></a><h3>The <code class="literal">"timeout"</code> property</h3>
<pre class="programlisting"> "timeout" <span class="type">guint64</span> : Read / Write</pre>
<p>The amount of time, in nanoseconds, to sample master and slave clocks.</p>
<p>Default value: 100000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstClock--window-size"></a><h3>The <code class="literal">"window-size"</code> property</h3>
<pre class="programlisting"> "window-size" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write</pre>
<p>The size of the window used to calculate rate and offset.</p>
<p>Allowed values: [2,1024]</p>
<p>Default value: 32</p>
</div>
<hr>
<div class="refsect2">
<a name="GstClock--window-threshold"></a><h3>The <code class="literal">"window-threshold"</code> property</h3>
<pre class="programlisting"> "window-threshold" <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> : Read / Write</pre>
<p>The threshold to start calculating rate and offset.</p>
<p>Allowed values: [2,1024]</p>
<p>Default value: 4</p>
</div>
</div>
<div class="refsect1">
<a name="GstClock.see-also"></a><h2>See Also</h2>
<a class="link" href="GstSystemClock.html" title="GstSystemClock"><span class="type">GstSystemClock</span></a>, <a class="link" href="GstPipeline.html" title="GstPipeline"><span class="type">GstPipeline</span></a>
</div>
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