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<h2><span class="refentrytitle"><a name="GstCollectPads.top_of_page"></a>GstCollectPads</span></h2>
<p>GstCollectPads — manages a set of pads that operate in collect mode</p>
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<div class="refsynopsisdiv">
<a name="GstCollectPads.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gst/base/gstcollectpads.h&gt;
struct <a class="link" href="GstCollectPads.html#GstCollectPads-struct" title="struct GstCollectPads">GstCollectPads</a>;
struct <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData">GstCollectData</a>;
<span class="returnvalue">void</span> (<a class="link" href="GstCollectPads.html#GstCollectDataDestroyNotify" title="GstCollectDataDestroyNotify ()">*GstCollectDataDestroyNotify</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);
<a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstCollectPads.html#GstCollectPadsBufferFunction" title="GstCollectPadsBufferFunction ()">*GstCollectPadsBufferFunction</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</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>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> (<a class="link" href="GstCollectPads.html#GstCollectPadsCompareFunction" title="GstCollectPadsCompareFunction ()">*GstCollectPadsCompareFunction</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data1</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp1</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data2</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp2</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>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (<a class="link" href="GstCollectPads.html#GstCollectPadsEventFunction" title="GstCollectPadsEventFunction ()">*GstCollectPadsEventFunction</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *pad</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstEvent.html#GstEvent"><span class="type">GstEvent</span></a> *event</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>);
<a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstCollectPads.html#GstCollectPadsClipFunction" title="GstCollectPadsClipFunction ()">*GstCollectPadsClipFunction</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *inbuffer</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> **outbuffer</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>);
<a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (<a class="link" href="GstCollectPads.html#GstCollectPadsFunction" title="GstCollectPadsFunction ()">*GstCollectPadsFunction</a>) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</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="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags">GstCollectPadsStateFlags</a>;
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STATE:CAPS" title="GST_COLLECT_PADS_STATE()">GST_COLLECT_PADS_STATE</a> (data)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STATE-IS-SET:CAPS" title="GST_COLLECT_PADS_STATE_IS_SET()">GST_COLLECT_PADS_STATE_IS_SET</a> (data,
flag)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STATE-SET:CAPS" title="GST_COLLECT_PADS_STATE_SET()">GST_COLLECT_PADS_STATE_SET</a> (data,
flag)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STATE-UNSET:CAPS" title="GST_COLLECT_PADS_STATE_UNSET()">GST_COLLECT_PADS_STATE_UNSET</a> (data,
flag)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-GET-STREAM-LOCK:CAPS" title="GST_COLLECT_PADS_GET_STREAM_LOCK()">GST_COLLECT_PADS_GET_STREAM_LOCK</a> (pads)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STREAM-LOCK:CAPS" title="GST_COLLECT_PADS_STREAM_LOCK()">GST_COLLECT_PADS_STREAM_LOCK</a> (pads)
#define <a class="link" href="GstCollectPads.html#GST-COLLECT-PADS-STREAM-UNLOCK:CAPS" title="GST_COLLECT_PADS_STREAM_UNLOCK()">GST_COLLECT_PADS_STREAM_UNLOCK</a> (pads)
<a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="returnvalue">GstCollectPads</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-new" title="gst_collect_pads_new ()">gst_collect_pads_new</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="returnvalue">GstCollectData</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-add-pad" title="gst_collect_pads_add_pad ()">gst_collect_pads_add_pad</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> *pad</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> size</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectDataDestroyNotify" title="GstCollectDataDestroyNotify ()"><span class="type">GstCollectDataDestroyNotify</span></a> destroy_notify</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> lock</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="GstCollectPads.html#gst-collect-pads-remove-pad" title="gst_collect_pads_remove_pad ()">gst_collect_pads_remove_pad</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> *pad</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-start" title="gst_collect_pads_start ()">gst_collect_pads_start</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-stop" title="gst_collect_pads_stop ()">gst_collect_pads_stop</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="GstCollectPads.html#gst-collect-pads-available" title="gst_collect_pads_available ()">gst_collect_pads_available</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);
<a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> <a class="link" href="GstCollectPads.html#gst-collect-pads-flush" title="gst_collect_pads_flush ()">gst_collect_pads_flush</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);
<a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-peek" title="gst_collect_pads_peek ()">gst_collect_pads_peek</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);
<a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-pop" title="gst_collect_pads_pop ()">gst_collect_pads_pop</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);
<a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-read-buffer" title="gst_collect_pads_read_buffer ()">gst_collect_pads_read_buffer</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);
<a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * <a class="link" href="GstCollectPads.html#gst-collect-pads-take-buffer" title="gst_collect_pads_take_buffer ()">gst_collect_pads_take_buffer</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-buffer-function" title="gst_collect_pads_set_buffer_function ()">gst_collect_pads_set_buffer_function</a>
(<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsBufferFunction" title="GstCollectPadsBufferFunction ()"><span class="type">GstCollectPadsBufferFunction</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-compare-function" title="gst_collect_pads_set_compare_function ()">gst_collect_pads_set_compare_function</a>
(<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsCompareFunction" title="GstCollectPadsCompareFunction ()"><span class="type">GstCollectPadsCompareFunction</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-event-function" title="gst_collect_pads_set_event_function ()">gst_collect_pads_set_event_function</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsEventFunction" title="GstCollectPadsEventFunction ()"><span class="type">GstCollectPadsEventFunction</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-clip-function" title="gst_collect_pads_set_clip_function ()">gst_collect_pads_set_clip_function</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsClipFunction" title="GstCollectPadsClipFunction ()"><span class="type">GstCollectPadsClipFunction</span></a> clipfunc</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-flushing" title="gst_collect_pads_set_flushing ()">gst_collect_pads_set_flushing</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-function" title="gst_collect_pads_set_function ()">gst_collect_pads_set_function</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsFunction" title="GstCollectPadsFunction ()"><span class="type">GstCollectPadsFunction</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>);
<span class="returnvalue">void</span> <a class="link" href="GstCollectPads.html#gst-collect-pads-set-waiting" title="gst_collect_pads_set_waiting ()">gst_collect_pads_set_waiting</a> (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> waiting</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="GstCollectPads.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 href="../gstreamer-1.0/GstObject.html">GstObject</a>
+----GstCollectPads
</pre>
</div>
<div class="refsect1">
<a name="GstCollectPads.description"></a><h2>Description</h2>
<p>
Manages a set of pads that operate in collect mode. This means that control
is given to the manager of this object when all pads have data.
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
Collectpads are created with <a class="link" href="GstCollectPads.html#gst-collect-pads-new" title="gst_collect_pads_new ()"><code class="function">gst_collect_pads_new()</code></a>. A callback should then
be installed with <a class="link" href="GstCollectPads.html#gst-collect-pads-set-function" title="gst_collect_pads_set_function ()"><code class="function">gst_collect_pads_set_function()</code></a>.
</p></li>
<li class="listitem"><p>
Pads are added to the collection with <a class="link" href="GstCollectPads.html#gst-collect-pads-add-pad" title="gst_collect_pads_add_pad ()"><code class="function">gst_collect_pads_add_pad()</code></a>/
<a class="link" href="GstCollectPads.html#gst-collect-pads-remove-pad" title="gst_collect_pads_remove_pad ()"><code class="function">gst_collect_pads_remove_pad()</code></a>. The pad
has to be a sinkpad. The chain and event functions of the pad are
overridden. The element_private of the pad is used to store
private information for the collectpads.
</p></li>
<li class="listitem"><p>
For each pad, data is queued in the _chain function or by
performing a pull_range.
</p></li>
<li class="listitem"><p>
When data is queued on all pads in waiting mode, the callback function is called.
</p></li>
<li class="listitem"><p>
Data can be dequeued from the pad with the <a class="link" href="GstCollectPads.html#gst-collect-pads-pop" title="gst_collect_pads_pop ()"><code class="function">gst_collect_pads_pop()</code></a> method.
One can peek at the data with the <a class="link" href="GstCollectPads.html#gst-collect-pads-peek" title="gst_collect_pads_peek ()"><code class="function">gst_collect_pads_peek()</code></a> function.
These functions will return NULL if the pad received an EOS event. When all
pads return NULL from a <a class="link" href="GstCollectPads.html#gst-collect-pads-peek" title="gst_collect_pads_peek ()"><code class="function">gst_collect_pads_peek()</code></a>, the element can emit an EOS
event itself.
</p></li>
<li class="listitem"><p>
Data can also be dequeued in byte units using the <a class="link" href="GstCollectPads.html#gst-collect-pads-available" title="gst_collect_pads_available ()"><code class="function">gst_collect_pads_available()</code></a>,
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstCollectPads.html#gst-collect-pads-read"><code class="function">gst_collect_pads_read()</code></a> and <a class="link" href="GstCollectPads.html#gst-collect-pads-flush" title="gst_collect_pads_flush ()"><code class="function">gst_collect_pads_flush()</code></a> calls.
</p></li>
<li class="listitem"><p>
Elements should call <a class="link" href="GstCollectPads.html#gst-collect-pads-start" title="gst_collect_pads_start ()"><code class="function">gst_collect_pads_start()</code></a> and <a class="link" href="GstCollectPads.html#gst-collect-pads-stop" title="gst_collect_pads_stop ()"><code class="function">gst_collect_pads_stop()</code></a> in
their state change functions to start and stop the processing of the collectpads.
The <a class="link" href="GstCollectPads.html#gst-collect-pads-stop" title="gst_collect_pads_stop ()"><code class="function">gst_collect_pads_stop()</code></a> call should be called before calling the parent
element state change function in the PAUSED_TO_READY state change to ensure
no pad is blocked and the element can finish streaming.
</p></li>
<li class="listitem"><p>
<a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstCollectPads.html#gst-collect-pads-collect"><code class="function">gst_collect_pads_collect()</code></a> and <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstCollectPads.html#gst-collect-pads-collect-range"><code class="function">gst_collect_pads_collect_range()</code></a> can be used by
elements that start a <a href="../gstreamer-1.0/GstTask.html"><span class="type">GstTask</span></a> to drive the collect_pads. This feature is however
not yet implemented.
</p></li>
<li class="listitem"><p>
<a class="link" href="GstCollectPads.html#gst-collect-pads-set-waiting" title="gst_collect_pads_set_waiting ()"><code class="function">gst_collect_pads_set_waiting()</code></a> sets a pad to waiting or non-waiting mode.
CollectPads element is not waiting for data to be collected on non-waiting pads.
Thus these pads may but need not have data when the callback is called.
All pads are in waiting mode by default.
</p></li>
</ul></div>
<p>
</p>
<p>
Last reviewed on 2011-10-28 (0.10.36)
</p>
</div>
<div class="refsect1">
<a name="GstCollectPads.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstCollectPads-struct"></a><h3>struct GstCollectPads</h3>
<pre class="programlisting">struct GstCollectPads {
GSList *data; /* list of CollectData items */
};
</pre>
<p>
Collectpads object.
</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-Singly-Linked-Lists.html#GSList"><span class="type">GSList</span></a> *<em class="structfield"><code><a name="GstCollectPads-struct.data"></a>data</code></em>;</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> managed by this <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectData"></a><h3>struct GstCollectData</h3>
<pre class="programlisting">struct GstCollectData {
/* with STREAM_LOCK of @collect */
GstCollectPads *collect;
GstPad *pad;
GstBuffer *buffer;
guint pos;
GstSegment segment;
};
</pre>
<p>
Structure used by the collect_pads.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *<em class="structfield"><code><a name="GstCollectData.collect"></a>collect</code></em>;</span></p></td>
<td>owner <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> *<em class="structfield"><code><a name="GstCollectData.pad"></a>pad</code></em>;</span></p></td>
<td>
<a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> managed by this data</td>
</tr>
<tr>
<td><p><span class="term"><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *<em class="structfield"><code><a name="GstCollectData.buffer"></a>buffer</code></em>;</span></p></td>
<td>currently queued buffer.</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="GstCollectData.pos"></a>pos</code></em>;</span></p></td>
<td>position in the buffer</td>
</tr>
<tr>
<td><p><span class="term"><a href="../gstreamer-1.0/gstreamer-GstSegment.html#GstSegment"><span class="type">GstSegment</span></a> <em class="structfield"><code><a name="GstCollectData.segment"></a>segment</code></em>;</span></p></td>
<td>last segment received.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectDataDestroyNotify"></a><h3>GstCollectDataDestroyNotify ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> (*GstCollectDataDestroyNotify) (<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);</pre>
<p>
A function that will be called when the <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> will be freed.
It is passed the pointer to the structure and should free any custom
memory and resources allocated for it.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> that will be freed</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsBufferFunction"></a><h3>GstCollectPadsBufferFunction ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstCollectPadsBufferFunction) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</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>
A function that will be called when a (considered oldest) buffer can be muxed.
If all pads have reached EOS, this function is called with NULL <em class="parameter"><code>buffer</code></em>
and NULL <em class="parameter"><code>data</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>pads</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> that trigered the callback</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> of pad that has received the buffer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>the <a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="GstCollectPads.html#gst-collect-pads-set-buffer-function" title="gst_collect_pads_set_buffer_function ()"><code class="function">gst_collect_pads_set_buffer_function()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="../gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> for success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsCompareFunction"></a><h3>GstCollectPadsCompareFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a> (*GstCollectPadsCompareFunction) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data1</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp1</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data2</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> timestamp2</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>
A function for comparing two timestamps of buffers or newsegments collected on one pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> that is comparing the timestamps</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data1</code></em> :</span></p></td>
<td>the first <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp1</code></em> :</span></p></td>
<td>the first timestamp</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data2</code></em> :</span></p></td>
<td>the second <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>timestamp2</code></em> :</span></p></td>
<td>the second timestamp</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="GstCollectPads.html#gst-collect-pads-set-compare-function" title="gst_collect_pads_set_compare_function ()"><code class="function">gst_collect_pads_set_compare_function()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>Integer less than zero when first timestamp is deemed older than the second one.
Zero if the timestamps are deemed equally old.
Integer greate than zero when second timestamp is deemed older than the first one.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsEventFunction"></a><h3>GstCollectPadsEventFunction ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a> (*GstCollectPadsEventFunction) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *pad</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstEvent.html#GstEvent"><span class="type">GstEvent</span></a> *event</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>
A function that will be called while processing an event. It takes
ownership of the event and is responsible for chaining up (to
<code class="function">gst_collect_pads_event_default()</code>) or dropping events (such typical cases
being handled by the default handler).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> that trigered the callback</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the <a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> that received an event</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>event</code></em> :</span></p></td>
<td>the <a href="../gstreamer-1.0/gstreamer-GstEvent.html#GstEvent"><span class="type">GstEvent</span></a> received</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="GstCollectPads.html#gst-collect-pads-set-event-function" title="gst_collect_pads_set_event_function ()"><code class="function">gst_collect_pads_set_event_function()</code></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"><code class="literal">TRUE</code></a> if the pad could handle the event</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsClipFunction"></a><h3>GstCollectPadsClipFunction ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstCollectPadsClipFunction) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *inbuffer</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> **outbuffer</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>
A function that will be called when <em class="parameter"><code>inbuffer</code></em> is received on the pad managed
by <em class="parameter"><code>data</code></em> in the collecpad object <em class="parameter"><code>pads</code></em>.
</p>
<p>
The function should use the segment of <em class="parameter"><code>data</code></em> and the negotiated media type on
the pad to perform clipping of <em class="parameter"><code>inbuffer</code></em>.
</p>
<p>
This function takes ownership of <em class="parameter"><code>inbuffer</code></em> and should output a buffer in
<em class="parameter"><code>outbuffer</code></em> or return <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> in <em class="parameter"><code>outbuffer</code></em> if the buffer should be dropped.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>inbuffer</code></em> :</span></p></td>
<td>the input <a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>outbuffer</code></em> :</span></p></td>
<td>the output <a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> that corresponds to the result of clipping.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsFunction"></a><h3>GstCollectPadsFunction ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a> (*GstCollectPadsFunction) (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</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>
A function that will be called when all pads have received data.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> that trigered the callback</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to <a class="link" href="GstCollectPads.html#gst-collect-pads-set-function" title="gst_collect_pads_set_function ()"><code class="function">gst_collect_pads_set_function()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="../gstreamer-1.0/GstPad.html#GST-FLOW-OK:CAPS"><span class="type">GST_FLOW_OK</span></a> for success</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GstCollectPadsStateFlags"></a><h3>enum GstCollectPadsStateFlags</h3>
<pre class="programlisting">typedef enum {
GST_COLLECT_PADS_STATE_EOS = 1 &lt;&lt; 0,
GST_COLLECT_PADS_STATE_FLUSHING = 1 &lt;&lt; 1,
GST_COLLECT_PADS_STATE_NEW_SEGMENT = 1 &lt;&lt; 2,
GST_COLLECT_PADS_STATE_WAITING = 1 &lt;&lt; 3,
GST_COLLECT_PADS_STATE_LOCKED = 1 &lt;&lt; 4
} GstCollectPadsStateFlags;
</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="GST-COLLECT-PADS-STATE-EOS:CAPS"></a><span class="term"><code class="literal">GST_COLLECT_PADS_STATE_EOS</code></span></p></td>
<td>Set if collectdata's pad is EOS.
</td>
</tr>
<tr>
<td><p><a name="GST-COLLECT-PADS-STATE-FLUSHING:CAPS"></a><span class="term"><code class="literal">GST_COLLECT_PADS_STATE_FLUSHING</code></span></p></td>
<td>Set if collectdata's pad is flushing.
</td>
</tr>
<tr>
<td><p><a name="GST-COLLECT-PADS-STATE-NEW-SEGMENT:CAPS"></a><span class="term"><code class="literal">GST_COLLECT_PADS_STATE_NEW_SEGMENT</code></span></p></td>
<td>Set if collectdata's pad received a
new_segment event.
</td>
</tr>
<tr>
<td><p><a name="GST-COLLECT-PADS-STATE-WAITING:CAPS"></a><span class="term"><code class="literal">GST_COLLECT_PADS_STATE_WAITING</code></span></p></td>
<td>Set if collectdata's pad must be waited
for when collecting.
</td>
</tr>
<tr>
<td><p><a name="GST-COLLECT-PADS-STATE-LOCKED:CAPS"></a><span class="term"><code class="literal">GST_COLLECT_PADS_STATE_LOCKED</code></span></p></td>
<td>Set collectdata's pad WAITING state must
not be changed.
<a class="link" href="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags"><span class="type">GstCollectPadsStateFlags</span></a> indicate private state of a collectdata('s pad).
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STATE:CAPS"></a><h3>GST_COLLECT_PADS_STATE()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STATE(data) (((GstCollectData *) data)-&gt;state)
</pre>
<p>
A flags word containing <a class="link" href="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags"><span class="type">GstCollectPadsStateFlags</span></a> flags set
on this collected pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>.</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STATE-IS-SET:CAPS"></a><h3>GST_COLLECT_PADS_STATE_IS_SET()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STATE_IS_SET(data,flag) !!(GST_COLLECT_PADS_STATE (data) &amp; flag)
</pre>
<p>
Gives the status of a specific flag on a collected pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags"><span class="type">GstCollectPadsStateFlags</span></a> to check.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STATE-SET:CAPS"></a><h3>GST_COLLECT_PADS_STATE_SET()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STATE_SET(data,flag) (GST_COLLECT_PADS_STATE (data) |= flag)
</pre>
<p>
Sets a state flag on a collected pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags"><span class="type">GstCollectPadsStateFlags</span></a> to set.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STATE-UNSET:CAPS"></a><h3>GST_COLLECT_PADS_STATE_UNSET()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STATE_UNSET(data,flag) (GST_COLLECT_PADS_STATE (data) &amp;= ~(flag))
</pre>
<p>
Clears a state flag on a collected pad.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flag</code></em> :</span></p></td>
<td>the <a class="link" href="GstCollectPads.html#GstCollectPadsStateFlags" title="enum GstCollectPadsStateFlags"><span class="type">GstCollectPadsStateFlags</span></a> to clear.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-GET-STREAM-LOCK:CAPS"></a><h3>GST_COLLECT_PADS_GET_STREAM_LOCK()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_GET_STREAM_LOCK(pads) (&amp;((GstCollectPads *)pads)-&gt;stream_lock)
</pre>
<p>
Get the stream lock of <em class="parameter"><code>pads</code></em>. The stream lock is used to coordinate and
serialize execution among the various streams being collected, and in
protecting the resources used to accomplish this.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STREAM-LOCK:CAPS"></a><h3>GST_COLLECT_PADS_STREAM_LOCK()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STREAM_LOCK(pads) g_rec_mutex_lock(GST_COLLECT_PADS_GET_STREAM_LOCK (pads))
</pre>
<p>
Lock the stream lock of <em class="parameter"><code>pads</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>pads</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="GST-COLLECT-PADS-STREAM-UNLOCK:CAPS"></a><h3>GST_COLLECT_PADS_STREAM_UNLOCK()</h3>
<pre class="programlisting">#define GST_COLLECT_PADS_STREAM_UNLOCK(pads) g_rec_mutex_unlock(GST_COLLECT_PADS_GET_STREAM_LOCK (pads))
</pre>
<p>
Unlock the stream lock of <em class="parameter"><code>pads</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>pads</code></em> :</span></p></td>
<td>a <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-new"></a><h3>gst_collect_pads_new ()</h3>
<pre class="programlisting"><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="returnvalue">GstCollectPads</span></a> * gst_collect_pads_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Create a new instance of <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</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"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a>, or NULL in case of an error. <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-collect-pads-add-pad"></a><h3>gst_collect_pads_add_pad ()</h3>
<pre class="programlisting"><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="returnvalue">GstCollectData</span></a> * gst_collect_pads_add_pad (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> *pad</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> size</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectDataDestroyNotify" title="GstCollectDataDestroyNotify ()"><span class="type">GstCollectDataDestroyNotify</span></a> destroy_notify</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> lock</code></em>);</pre>
<p>
Add a pad to the collection of collect pads. The pad has to be
a sinkpad. The refcount of the pad is incremented. Use
<a class="link" href="GstCollectPads.html#gst-collect-pads-remove-pad" title="gst_collect_pads_remove_pad ()"><code class="function">gst_collect_pads_remove_pad()</code></a> to remove the pad from the collection
again.
</p>
<p>
You specify a size for the returned <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> structure
so that you can use it to store additional information.
</p>
<p>
You can also specify a <a class="link" href="GstCollectPads.html#GstCollectDataDestroyNotify" title="GstCollectDataDestroyNotify ()"><span class="type">GstCollectDataDestroyNotify</span></a> that will be called
just before the <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> structure is freed. It is passed the
pointer to the structure and should free any custom memory and resources
allocated for it.
</p>
<p>
Keeping a pad locked in waiting state is only relevant when using
the default collection algorithm (providing the oldest buffer).
It ensures a buffer must be available on this pad for a collection
to take place. This is of typical use to a muxer element where
non-subtitle streams should always be in waiting state,
e.g. to assure that caps information is available on all these streams
when initial headers have to be written.
</p>
<p>
The pad will be automatically activated in push mode when <em class="parameter"><code>pads</code></em> is
started.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad to add. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the size of the returned <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> structure</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy_notify</code></em> :</span></p></td>
<td>function to be called before the returned <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a>
structure is freed</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>lock</code></em> :</span></p></td>
<td>whether to lock this pad in usual waiting state</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="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> to identify the new pad. Or NULL
if wrong parameters are supplied.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-remove-pad"></a><h3>gst_collect_pads_remove_pad ()</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_collect_pads_remove_pad (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a href="../gstreamer-1.0/GstPad.html"><span class="type">GstPad</span></a> *pad</code></em>);</pre>
<p>
Remove a pad from the collection of collect pads. This function will also
free the <a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> and all the resources that were allocated with
<a class="link" href="GstCollectPads.html#gst-collect-pads-add-pad" title="gst_collect_pads_add_pad ()"><code class="function">gst_collect_pads_add_pad()</code></a>.
</p>
<p>
The pad will be deactivated automatically when <em class="parameter"><code>pads</code></em> is stopped.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>pad</code></em> :</span></p></td>
<td>the pad to remove. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the pad could be removed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-start"></a><h3>gst_collect_pads_start ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_start (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);</pre>
<p>
Starts the processing of data in the collect_pads.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-stop"></a><h3>gst_collect_pads_stop ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_stop (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);</pre>
<p>
Stops the processing of data in the collect_pads. this function
will also unblock any blocking operations.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-available"></a><h3>gst_collect_pads_available ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_collect_pads_available (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>);</pre>
<p>
Query how much bytes can be read from each queued buffer. This means
that the result of this call is the maximum number of bytes that can
be read from each of the pads.
</p>
<p>
This function should be called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as
in the callback.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to query</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The maximum number of bytes queued on all pads. This function
returns 0 if a pad has no queued buffer.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-flush"></a><h3>gst_collect_pads_flush ()</h3>
<pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a> gst_collect_pads_flush (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);</pre>
<p>
Flush <em class="parameter"><code>size</code></em> bytes from the pad <em class="parameter"><code>data</code></em>.
</p>
<p>
This function should be called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as
in the callback.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to query</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the number of bytes to flush</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The number of bytes flushed This can be less than <em class="parameter"><code>size</code></em> and
is 0 if the pad was end-of-stream.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-peek"></a><h3>gst_collect_pads_peek ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_collect_pads_peek (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);</pre>
<p>
Peek at the buffer currently queued in <em class="parameter"><code>data</code></em>. This function
should be called with the <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as in the callback
handler.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to peek</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The buffer in <em class="parameter"><code>data</code></em> or NULL if no buffer is queued.
should unref the buffer after usage.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-pop"></a><h3>gst_collect_pads_pop ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_collect_pads_pop (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</code></em>);</pre>
<p>
Pop the buffer currently queued in <em class="parameter"><code>data</code></em>. This function
should be called with the <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as in the callback
handler.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to pop</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The buffer in <em class="parameter"><code>data</code></em> or NULL if no buffer was
queued. You should unref the buffer after usage. <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-collect-pads-read-buffer"></a><h3>gst_collect_pads_read_buffer ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_collect_pads_read_buffer (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);</pre>
<p>
Get a subbuffer of <em class="parameter"><code>size</code></em> bytes from the given pad <em class="parameter"><code>data</code></em>.
</p>
<p>
This function should be called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as in the
callback.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to query</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the number of bytes to read</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A sub buffer. The size of the buffer can be less that requested.
A return of NULL signals that the pad is end-of-stream.
Unref the buffer after use. <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-collect-pads-take-buffer"></a><h3>gst_collect_pads_take_buffer ()</h3>
<pre class="programlisting"><a href="../gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> * gst_collect_pads_take_buffer (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> size</code></em>);</pre>
<p>
Get a subbuffer of <em class="parameter"><code>size</code></em> bytes from the given pad <em class="parameter"><code>data</code></em>. Flushes the amount
of read bytes.
</p>
<p>
This function should be called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as in the
callback.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to query</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>the number of bytes to read</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A sub buffer. The size of the buffer can be less that requested.
A return of NULL signals that the pad is end-of-stream.
Unref the buffer after use.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-buffer-function"></a><h3>gst_collect_pads_set_buffer_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_buffer_function
(<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsBufferFunction" title="GstCollectPadsBufferFunction ()"><span class="type">GstCollectPadsBufferFunction</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>);</pre>
<p>
Set the callback function and user data that will be called with
the oldest buffer when all pads have been collected.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-compare-function"></a><h3>gst_collect_pads_set_compare_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_compare_function
(<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsCompareFunction" title="GstCollectPadsCompareFunction ()"><span class="type">GstCollectPadsCompareFunction</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>);</pre>
<p>
Set the timestamp comparison function.
</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>pads</code></em> :</span></p></td>
<td>the pads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function. <span class="annotation">[<acronym title="This parameter is a 'user_data', for callbacks; many bindings can pass NULL here."><span class="acronym">closure</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-event-function"></a><h3>gst_collect_pads_set_event_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_event_function (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsEventFunction" title="GstCollectPadsEventFunction ()"><span class="type">GstCollectPadsEventFunction</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>);</pre>
<p>
Set the event callback function and user data that will be called when
collectpads has received an event originating from one of the collected
pads. If the event being processed is a serialized one, this callback is
called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, otherwise not. As this lock should be
held when calling a number of CollectPads functions, it should be acquired
if so (unusually) needed.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-clip-function"></a><h3>gst_collect_pads_set_clip_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_clip_function (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsClipFunction" title="GstCollectPadsClipFunction ()"><span class="type">GstCollectPadsClipFunction</span></a> clipfunc</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>
Install a clipping function that is called right after a buffer is received
on a pad managed by <em class="parameter"><code>pads</code></em>. See <span class="type">GstCollectPad2ClipFunction</span> for more info.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>clipfunc</code></em> :</span></p></td>
<td>clip function to install</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data to pass to <em class="parameter"><code>clip_func</code></em>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-flushing"></a><h3>gst_collect_pads_set_flushing ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_flushing (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</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>
Change the flushing state of all the pads in the collection. No pad
is able to accept anymore data when <em class="parameter"><code>flushing</code></em> is <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>. Calling this
function with <em class="parameter"><code>flushing</code></em> <a href="http://library.gnome.org/devel/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> makes <em class="parameter"><code>pads</code></em> accept data again.
Caller must ensure that downstream streaming (thread) is not blocked,
e.g. by sending a FLUSH_START downstream.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>flushing</code></em> :</span></p></td>
<td>desired state of the pads</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-function"></a><h3>gst_collect_pads_set_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_function (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectPadsFunction" title="GstCollectPadsFunction ()"><span class="type">GstCollectPadsFunction</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>);</pre>
<p>
CollectPads provides a default collection algorithm that will determine
the oldest buffer available on all of its pads, and then delegate
to a configured callback.
However, if circumstances are more complicated and/or more control
is desired, this sets a callback that will be invoked instead when
all the pads added to the collection have buffers queued.
Evidently, this callback is not compatible with
<a class="link" href="GstCollectPads.html#gst-collect-pads-set-buffer-function" title="gst_collect_pads_set_buffer_function ()"><code class="function">gst_collect_pads_set_buffer_function()</code></a> callback.
If this callback is set, the former will be unset.
</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>pads</code></em> :</span></p></td>
<td>the collectpads to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>the function to set</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data passed to the function</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-collect-pads-set-waiting"></a><h3>gst_collect_pads_set_waiting ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> gst_collect_pads_set_waiting (<em class="parameter"><code><a class="link" href="GstCollectPads.html" title="GstCollectPads"><span class="type">GstCollectPads</span></a> *pads</code></em>,
<em class="parameter"><code><a class="link" href="GstCollectPads.html#GstCollectData" title="struct GstCollectData"><span class="type">GstCollectData</span></a> *data</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> waiting</code></em>);</pre>
<p>
Sets a pad to waiting or non-waiting mode, if at least this pad
has not been created with locked waiting state,
in which case nothing happens.
</p>
<p>
This function should be called with <em class="parameter"><code>pads</code></em> STREAM_LOCK held, such as
in the callback.
</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>pads</code></em> :</span></p></td>
<td>the collectpads</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>the data to use</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>waiting</code></em> :</span></p></td>
<td>boolean indicating whether this pad should operate
in waiting or non-waiting mode</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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