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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a name="gstreamer-libs-GstDataQueue"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gstreamer-libs-GstDataQueue.top_of_page"></a>GstDataQueue</span></h2>
<p>GstDataQueue — Threadsafe queueing object</p>
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<div class="refsynopsisdiv">
<a name="gstreamer-libs-GstDataQueue.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <gst/base/gstdataqueue.h>
struct <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue">GstDataQueue</a>;
struct <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueSize" title="struct GstDataQueueSize">GstDataQueueSize</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="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()">*GstDataQueueCheckFullFunction</a>) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> visible</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> bytes</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> time</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> checkdata</code></em>);
struct <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem">GstDataQueueItem</a>;
<span class="returnvalue">void</span> (<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueEmptyCallback" title="GstDataQueueEmptyCallback ()">*GstDataQueueEmptyCallback</a>) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</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> checkdata</code></em>);
<span class="returnvalue">void</span> (<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueFullCallback" title="GstDataQueueFullCallback ()">*GstDataQueueFullCallback</a>) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</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> checkdata</code></em>);
<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="returnvalue">GstDataQueue</span></a> * <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-new" title="gst_data_queue_new ()">gst_data_queue_new</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()"><span class="type">GstDataQueueCheckFullFunction</span></a> checkfull</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> checkdata</code></em>);
<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="returnvalue">GstDataQueue</span></a> * <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-new-full" title="gst_data_queue_new_full ()">gst_data_queue_new_full</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()"><span class="type">GstDataQueueCheckFullFunction</span></a> checkfull</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueFullCallback" title="GstDataQueueFullCallback ()"><span class="type">GstDataQueueFullCallback</span></a> fullcallback</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueEmptyCallback" title="GstDataQueueEmptyCallback ()"><span class="type">GstDataQueueEmptyCallback</span></a> emptycallback</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> checkdata</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-push" title="gst_data_queue_push ()">gst_data_queue_push</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> *item</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-pop" title="gst_data_queue_pop ()">gst_data_queue_pop</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> **item</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-flush" title="gst_data_queue_flush ()">gst_data_queue_flush</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-set-flushing" title="gst_data_queue_set_flushing ()">gst_data_queue_set_flushing</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flushing</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-drop-head" title="gst_data_queue_drop_head ()">gst_data_queue_drop_head</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-is-full" title="gst_data_queue_is_full ()">gst_data_queue_is_full</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-is-empty" title="gst_data_queue_is_empty ()">gst_data_queue_is_empty</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-get-level" title="gst_data_queue_get_level ()">gst_data_queue_get_level</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueSize" title="struct GstDataQueueSize"><span class="type">GstDataQueueSize</span></a> *level</code></em>);
<span class="returnvalue">void</span> <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-limits-changed" title="gst_data_queue_limits_changed ()">gst_data_queue_limits_changed</a> (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-libs-GstDataQueue.description"></a><h2>Description</h2>
<p>
<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> is an object that handles threadsafe queueing of objects. It
also provides size-related functionality. This object should be used for
any <a href="../gstreamer-0.11/GstElement.html"><span class="type">GstElement</span></a> that wishes to provide some sort of queueing functionality.
</p>
</div>
<div class="refsect1">
<a name="gstreamer-libs-GstDataQueue.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstDataQueue"></a><h3>struct GstDataQueue</h3>
<pre class="programlisting">struct GstDataQueue {
GObject object;
};
</pre>
<p>
Opaque <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/gobject/unstable/gobject-The-Base-Object-Type.html#GObject"><span class="type">GObject</span></a> <em class="structfield"><code><a name="GstDataQueue.object"></a>object</code></em>;</span></p></td>
<td>the parent structure</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDataQueueSize"></a><h3>struct GstDataQueueSize</h3>
<pre class="programlisting">struct GstDataQueueSize {
guint visible;
guint bytes;
guint64 time;
};
</pre>
<p>
Structure describing the size of a queue.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstDataQueueSize.visible"></a>visible</code></em>;</span></p></td>
<td>number of buffers</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstDataQueueSize.bytes"></a>bytes</code></em>;</span></p></td>
<td>number of bytes</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> <em class="structfield"><code><a name="GstDataQueueSize.time"></a>time</code></em>;</span></p></td>
<td>amount of time</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDataQueueCheckFullFunction"></a><h3>GstDataQueueCheckFullFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstDataQueueCheckFullFunction) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> visible</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> bytes</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> time</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> checkdata</code></em>);</pre>
<p>
The prototype of the function used to inform the queue that it should be
considered as full.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>visible</code></em> :</span></p></td>
<td>The number of visible items currently in the queue.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>bytes</code></em> :</span></p></td>
<td>The amount of bytes currently in the queue.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>The accumulated duration of the items currently in the queue.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>checkdata</code></em> :</span></p></td>
<td>The <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> registered when the <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> was created.</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"><span class="type">TRUE</span></a> if the queue should be considered full.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDataQueueItem"></a><h3>struct GstDataQueueItem</h3>
<pre class="programlisting">struct GstDataQueueItem {
GstMiniObject *object;
guint size;
guint64 duration;
gboolean visible;
/* user supplied destroy function */
GDestroyNotify destroy;
};
</pre>
<p>
Structure used by <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>. You can supply a different structure, as
long as the top of the structure is identical to this structure.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="../gstreamer-0.11/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> *<em class="structfield"><code><a name="GstDataQueueItem.object"></a>object</code></em>;</span></p></td>
<td>the <a href="../gstreamer-0.11/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> to queue.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> <em class="structfield"><code><a name="GstDataQueueItem.size"></a>size</code></em>;</span></p></td>
<td>the size in bytes of the miniobject.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a> <em class="structfield"><code><a name="GstDataQueueItem.duration"></a>duration</code></em>;</span></p></td>
<td>the duration in <a href="../gstreamer-0.11/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> of the miniobject. Can not be
<a href="../gstreamer-0.11/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> <em class="structfield"><code><a name="GstDataQueueItem.visible"></a>visible</code></em>;</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> if <em class="parameter"><code>object</code></em> should be considered as a visible object.</td>
</tr>
<tr>
<td><p><span class="term"><a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> <em class="structfield"><code><a name="GstDataQueueItem.destroy"></a>destroy</code></em>;</span></p></td>
<td>The <a href="http://library.gnome.org/devel/glib/unstable/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> function to use to free the <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a>.
This function should also drop the reference to <em class="parameter"><code>object</code></em> the owner of the
<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> is assumed to hold.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="GstDataQueueEmptyCallback"></a><h3>GstDataQueueEmptyCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstDataQueueEmptyCallback) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</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> checkdata</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="GstDataQueueFullCallback"></a><h3>GstDataQueueFullCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstDataQueueFullCallback) (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</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> checkdata</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-new"></a><h3>gst_data_queue_new ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="returnvalue">GstDataQueue</span></a> * gst_data_queue_new (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()"><span class="type">GstDataQueueCheckFullFunction</span></a> checkfull</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> checkdata</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>checkfull</code></em> :</span></p></td>
<td>the callback used to tell if the element considers the queue full
or not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>checkdata</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> that will be given in the <em class="parameter"><code>checkfull</code></em> callback.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-new-full"></a><h3>gst_data_queue_new_full ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="returnvalue">GstDataQueue</span></a> * gst_data_queue_new_full (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()"><span class="type">GstDataQueueCheckFullFunction</span></a> checkfull</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueFullCallback" title="GstDataQueueFullCallback ()"><span class="type">GstDataQueueFullCallback</span></a> fullcallback</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueEmptyCallback" title="GstDataQueueEmptyCallback ()"><span class="type">GstDataQueueEmptyCallback</span></a> emptycallback</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> checkdata</code></em>);</pre>
<p>
Creates a new <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>. The difference with <em class="parameter"><code>gst_data_queue_new</code></em> is that it will
not emit the 'full' and 'empty' signals, but instead calling directly <em class="parameter"><code>fullcallback</code></em>
or <em class="parameter"><code>emptycallback</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>checkfull</code></em> :</span></p></td>
<td>the callback used to tell if the element considers the queue full
or not.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>fullcallback</code></em> :</span></p></td>
<td>the callback which will be called when the queue is considered full.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>emptycallback</code></em> :</span></p></td>
<td>the callback which will be called when the queue is considered empty.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>checkdata</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> that will be given in the <em class="parameter"><code>checkfull</code></em> callback.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.26</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-push"></a><h3>gst_data_queue_push ()</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_data_queue_push (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> *item</code></em>);</pre>
<p>
Pushes a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> (or a structure that begins with the same fields)
on the <em class="parameter"><code>queue</code></em>. If the <em class="parameter"><code>queue</code></em> is full, the call will block until space is
available, OR the <em class="parameter"><code>queue</code></em> is set to flushing state.
MT safe.
</p>
<p>
Note that this function has slightly different semantics than <a href="../gstreamer-0.11/GstPad.html#gst-pad-push"><code class="function">gst_pad_push()</code></a>
and <a href="../gstreamer-0.11/GstPad.html#gst-pad-push-event"><code class="function">gst_pad_push_event()</code></a>: this function only takes ownership of <em class="parameter"><code>item</code></em> and
the <a href="../gstreamer-0.11/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> contained in <em class="parameter"><code>item</code></em> if the push was successful. If FALSE
is returned, the caller is responsible for freeing <em class="parameter"><code>item</code></em> and its contents.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>item</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a>.</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"><span class="type">TRUE</span></a> if the <em class="parameter"><code>item</code></em> was successfully pushed on the <em class="parameter"><code>queue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-pop"></a><h3>gst_data_queue_pop ()</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_data_queue_pop (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a> **item</code></em>);</pre>
<p>
Retrieves the first <em class="parameter"><code>item</code></em> available on the <em class="parameter"><code>queue</code></em>. If the queue is currently
empty, the call will block until at least one item is available, OR the
<em class="parameter"><code>queue</code></em> is set to the flushing state.
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>item</code></em> :</span></p></td>
<td>pointer to store the returned <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueItem" title="struct GstDataQueueItem"><span class="type">GstDataQueueItem</span></a>.</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"><span class="type">TRUE</span></a> if an <em class="parameter"><code>item</code></em> was successfully retrieved from the <em class="parameter"><code>queue</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-flush"></a><h3>gst_data_queue_flush ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_data_queue_flush (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);</pre>
<p>
Flushes all the contents of the <em class="parameter"><code>queue</code></em>. Any call to <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-push" title="gst_data_queue_push ()"><span class="type">gst_data_queue_push</span></a> and
<a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-pop" title="gst_data_queue_pop ()"><span class="type">gst_data_queue_pop</span></a> will be released.
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-set-flushing"></a><h3>gst_data_queue_set_flushing ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_data_queue_set_flushing (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> flushing</code></em>);</pre>
<p>
Sets the queue to flushing state if <em class="parameter"><code>flushing</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a>. If set to flushing
state, any incoming data on the <em class="parameter"><code>queue</code></em> will be discarded. Any call currently
blocking on <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-push" title="gst_data_queue_push ()"><span class="type">gst_data_queue_push</span></a> or <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-pop" title="gst_data_queue_pop ()"><span class="type">gst_data_queue_pop</span></a> will return straight
away with a return value of <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>. While the <em class="parameter"><code>queue</code></em> is in flushing state,
all calls to those two functions will return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>.
</p>
<p>
MT Safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flushing</code></em> :</span></p></td>
<td>a <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> stating if the queue will be flushing or not.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-drop-head"></a><h3>gst_data_queue_drop_head ()</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_data_queue_drop_head (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> type</code></em>);</pre>
<p>
Pop and unref the head-most <a href="../gstreamer-0.11/gstreamer-GstMiniObject.html#GstMiniObject"><span class="type">GstMiniObject</span></a> with the given <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> to drop an item from.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>type</code></em> :</span></p></td>
<td>The <a href="http://library.gnome.org/devel/gobject/unstable/gobject-Type-Information.html#GType"><span class="type">GType</span></a> of the item to drop.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if an element was removed.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-is-full"></a><h3>gst_data_queue_is_full ()</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_data_queue_is_full (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);</pre>
<p>
Queries if <em class="parameter"><code>queue</code></em> is full. This check will be done using the
<a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueCheckFullFunction" title="GstDataQueueCheckFullFunction ()"><span class="type">GstDataQueueCheckFullFunction</span></a> registered with <em class="parameter"><code>queue</code></em>.
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</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"><span class="type">TRUE</span></a> if <em class="parameter"><code>queue</code></em> is full.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-is-empty"></a><h3>gst_data_queue_is_empty ()</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_data_queue_is_empty (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);</pre>
<p>
Queries if there are any items in the <em class="parameter"><code>queue</code></em>.
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>a <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>.</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"><span class="type">TRUE</span></a> if <em class="parameter"><code>queue</code></em> is empty.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-get-level"></a><h3>gst_data_queue_get_level ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_data_queue_get_level (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>,
<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueueSize" title="struct GstDataQueueSize"><span class="type">GstDataQueueSize</span></a> *level</code></em>);</pre>
<p>
Get the current level of the queue.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>level</code></em> :</span></p></td>
<td>the location to store the result</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.11</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-data-queue-limits-changed"></a><h3>gst_data_queue_limits_changed ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_data_queue_limits_changed (<em class="parameter"><code><a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a> *queue</code></em>);</pre>
<p>
Inform the queue that the limits for the fullness check have changed and that
any blocking <a class="link" href="gstreamer-libs-GstDataQueue.html#gst-data-queue-push" title="gst_data_queue_push ()"><code class="function">gst_data_queue_push()</code></a> should be unblocked to recheck the limts.
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<td><p><span class="term"><em class="parameter"><code>queue</code></em> :</span></p></td>
<td>The <a class="link" href="gstreamer-libs-GstDataQueue.html#GstDataQueue" title="struct GstDataQueue"><span class="type">GstDataQueue</span></a>
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<p class="since">Since 0.10.11</p>
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