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<div class="refentry">
<a name="GstBufferList"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstBufferList.top_of_page"></a>GstBufferList</span></h2>
<p>GstBufferList — Lists of buffers for data-passing</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstBufferList.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-new" title="gst_buffer_list_new ()">gst_buffer_list_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-new-sized" title="gst_buffer_list_new_sized ()">gst_buffer_list_new_sized</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-length" title="gst_buffer_list_length ()">gst_buffer_list_length</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-add" title="gst_buffer_list_add()">gst_buffer_list_add</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-insert" title="gst_buffer_list_insert ()">gst_buffer_list_insert</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-remove" title="gst_buffer_list_remove ()">gst_buffer_list_remove</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-ref" title="gst_buffer_list_ref ()">gst_buffer_list_ref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-unref" title="gst_buffer_list_unref ()">gst_buffer_list_unref</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-copy" title="gst_buffer_list_copy ()">gst_buffer_list_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-is-writable" title="gst_buffer_list_is_writable()">gst_buffer_list_is_writable</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-make-writable" title="gst_buffer_list_make_writable()">gst_buffer_list_make_writable</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GstBufferList.html#GstBufferListFunc" title="GstBufferListFunc ()">*GstBufferListFunc</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-foreach" title="gst_buffer_list_foreach ()">gst_buffer_list_foreach</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstBufferList.html#gst-buffer-list-get" title="gst_buffer_list_get ()">gst_buffer_list_get</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBufferList.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstBufferList.html#GstBufferList-struct" title="GstBufferList">GstBufferList</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstBufferList.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="https://developer.gnome.org/gobject/unstable/gobject-Boxed-Types.html">GBoxed</a>
<span class="lineart">╰──</span> GstBufferList
</pre>
</div>
<div class="refsect1">
<a name="GstBufferList.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstBufferList.description"></a><h2>Description</h2>
<p>Buffer lists are an object containing a list of buffers.</p>
<p>Buffer lists are created with <a class="link" href="GstBufferList.html#gst-buffer-list-new" title="gst_buffer_list_new ()"><code class="function">gst_buffer_list_new()</code></a> and filled with data
using a <a class="link" href="GstBufferList.html#gst-buffer-list-insert" title="gst_buffer_list_insert ()"><code class="function">gst_buffer_list_insert()</code></a>.</p>
<p>Buffer lists can be pushed on a srcpad with <a class="link" href="GstPad.html#gst-pad-push-list" title="gst_pad_push_list ()"><code class="function">gst_pad_push_list()</code></a>. This is
interesting when multiple buffers need to be pushed in one go because it
can reduce the amount of overhead for pushing each buffer individually.</p>
</div>
<div class="refsect1">
<a name="GstBufferList.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-buffer-list-new"></a><h3>gst_buffer_list_new ()</h3>
<pre class="programlisting"><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
gst_buffer_list_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Creates a new, empty <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. The caller is responsible for unreffing
the returned <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>.</p>
<p>Free-function: gst_buffer_list_unref</p>
<div class="refsect3">
<a name="id-1.3.8.8.2.6"></a><h4>Returns</h4>
<p> the new <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. <a class="link" href="GstBufferList.html#gst-buffer-list-unref" title="gst_buffer_list_unref ()"><code class="function">gst_buffer_list_unref()</code></a>
after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-new-sized"></a><h3>gst_buffer_list_new_sized ()</h3>
<pre class="programlisting"><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
gst_buffer_list_new_sized (<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> size</code></em>);</pre>
<p>Creates a new, empty <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. The caller is responsible for unreffing
the returned <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. The list will have <em class="parameter"><code>size</code></em>
space preallocated so
that memory reallocations can be avoided.</p>
<p>Free-function: gst_buffer_list_unref</p>
<div class="refsect3">
<a name="id-1.3.8.8.3.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>an initial reserved size</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.3.7"></a><h4>Returns</h4>
<p> the new <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. <a class="link" href="GstBufferList.html#gst-buffer-list-unref" title="gst_buffer_list_unref ()"><code class="function">gst_buffer_list_unref()</code></a>
after usage. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-length"></a><h3>gst_buffer_list_length ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_buffer_list_length (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>Returns the number of buffers in <em class="parameter"><code>list</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.8.8.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.4.6"></a><h4>Returns</h4>
<p> the number of buffers in the buffer list</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-add"></a><h3>gst_buffer_list_add()</h3>
<pre class="programlisting">#define gst_buffer_list_add(l,b) gst_buffer_list_insert((l),-1,(b));
</pre>
<p>Append <em class="parameter"><code>b</code></em>
at the end of <em class="parameter"><code>l</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.8.8.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>l</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>b</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-insert"></a><h3>gst_buffer_list_insert ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_list_insert (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gint"><span class="type">gint</span></a> idx</code></em>,
<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>);</pre>
<p>Insert <em class="parameter"><code>buffer</code></em>
at <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>list</code></em>
. Other buffers are moved to make room for
this new buffer.</p>
<p>A -1 value for <em class="parameter"><code>idx</code></em>
will append the buffer at the end.</p>
<div class="refsect3">
<a name="id-1.3.8.8.6.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>the index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-remove"></a><h3>gst_buffer_list_remove ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_list_remove (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> length</code></em>);</pre>
<p>Remove <em class="parameter"><code>length</code></em>
buffers starting from <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>list</code></em>
. The following buffers
are moved to close the gap.</p>
<div class="refsect3">
<a name="id-1.3.8.8.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>the index</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>length</p></td>
<td class="parameter_description"><p>the amount to remove</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-ref"></a><h3>gst_buffer_list_ref ()</h3>
<pre class="programlisting"><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
gst_buffer_list_ref (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>Increases the refcount of the given buffer list by one.</p>
<p>Note that the refcount affects the writability of <em class="parameter"><code>list</code></em>
and its data, see
<a class="link" href="GstBufferList.html#gst-buffer-list-make-writable" title="gst_buffer_list_make_writable()"><code class="function">gst_buffer_list_make_writable()</code></a>. It is important to note that keeping
additional references to GstBufferList instances can potentially increase
the number of memcpy operations in a pipeline.</p>
<div class="refsect3">
<a name="id-1.3.8.8.8.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.8.7"></a><h4>Returns</h4>
<p> <em class="parameter"><code>list</code></em>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-unref"></a><h3>gst_buffer_list_unref ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_buffer_list_unref (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>Decreases the refcount of the buffer list. If the refcount reaches 0, the
buffer list will be freed.</p>
<div class="refsect3">
<a name="id-1.3.8.8.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-copy"></a><h3>gst_buffer_list_copy ()</h3>
<pre class="programlisting"><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="returnvalue">GstBufferList</span></a> *
gst_buffer_list_copy (<em class="parameter"><code>const <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>);</pre>
<p>Create a shallow copy of the given buffer list. This will make a newly
allocated copy of the source list with copies of buffer pointers. The
refcount of buffers pointed to will be increased by one.</p>
<div class="refsect3">
<a name="id-1.3.8.8.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.10.6"></a><h4>Returns</h4>
<p> a new copy of <em class="parameter"><code>list</code></em>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-is-writable"></a><h3>gst_buffer_list_is_writable()</h3>
<pre class="programlisting">#define gst_buffer_list_is_writable(list) gst_mini_object_is_writable (GST_MINI_OBJECT_CAST (list))
</pre>
<p>Tests if you can safely add buffers and groups into a buffer list.</p>
<div class="refsect3">
<a name="id-1.3.8.8.11.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-make-writable"></a><h3>gst_buffer_list_make_writable()</h3>
<pre class="programlisting">#define gst_buffer_list_make_writable(list) GST_BUFFER_LIST_CAST (gst_mini_object_make_writable (GST_MINI_OBJECT_CAST (list)))
</pre>
<p>Makes a writable buffer list from the given buffer list. If the source buffer
list is already writable, this will simply return the same buffer list. A
copy will otherwise be made using <a class="link" href="GstBufferList.html#gst-buffer-list-copy" title="gst_buffer_list_copy ()"><code class="function">gst_buffer_list_copy()</code></a>.</p>
<div class="refsect3">
<a name="id-1.3.8.8.12.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.12.6"></a><h4>Returns</h4>
<p> a writable list, which may or may not be the
same as <em class="parameter"><code>list</code></em>
. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstBufferListFunc"></a><h3>GstBufferListFunc ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
<span class="c_punctuation">(</span>*GstBufferListFunc<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="type">GstBuffer</span></a> **buffer</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/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 from <a class="link" href="GstBufferList.html#gst-buffer-list-foreach" title="gst_buffer_list_foreach ()"><code class="function">gst_buffer_list_foreach()</code></a>. The <em class="parameter"><code>buffer</code></em>
field will point to a the reference of the buffer at <em class="parameter"><code>idx</code></em>
.</p>
<p>When this function returns <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a>, the next buffer will be
returned. When <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> is returned, <a class="link" href="GstBufferList.html#gst-buffer-list-foreach" title="gst_buffer_list_foreach ()"><code class="function">gst_buffer_list_foreach()</code></a> will return.</p>
<p>When <em class="parameter"><code>buffer</code></em>
is set to <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the item will be removed from the bufferlist.
When <em class="parameter"><code>buffer</code></em>
has been made writable, the new buffer reference can be assigned
to <em class="parameter"><code>buffer</code></em>
. This function is responsible for unreffing the old buffer when
removing or modifying.</p>
<div class="refsect3">
<a name="id-1.3.8.8.13.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>buffer</p></td>
<td class="parameter_description"><p> pointer the buffer. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>the index of <em class="parameter"><code>buffer</code></em>
</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>user data passed to <a class="link" href="GstBufferList.html#gst-buffer-list-foreach" title="gst_buffer_list_foreach ()"><code class="function">gst_buffer_list_foreach()</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.13.8"></a><h4>Returns</h4>
<p> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> when <a class="link" href="GstBufferList.html#gst-buffer-list-foreach" title="gst_buffer_list_foreach ()"><code class="function">gst_buffer_list_foreach()</code></a> should stop</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-foreach"></a><h3>gst_buffer_list_foreach ()</h3>
<pre class="programlisting"><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_buffer_list_foreach (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>,
<em class="parameter"><code><a class="link" href="GstBufferList.html#GstBufferListFunc" title="GstBufferListFunc ()"><span class="type">GstBufferListFunc</span></a> func</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>Call <em class="parameter"><code>func</code></em>
with <em class="parameter"><code>data</code></em>
for each buffer in <em class="parameter"><code>list</code></em>
.</p>
<p><em class="parameter"><code>func</code></em>
can modify the passed buffer pointer or its contents. The return value
of <em class="parameter"><code>func</code></em>
define if this function returns or if the remaining buffers in
the list should be skipped.</p>
<div class="refsect3">
<a name="id-1.3.8.8.14.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>func</p></td>
<td class="parameter_description"><p> a <a class="link" href="GstBufferList.html#GstBufferListFunc" title="GstBufferListFunc ()"><span class="type">GstBufferListFunc</span></a> to call. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="The callback is valid only during the call to the method."><span class="acronym">scope call</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p> user data passed to <em class="parameter"><code>func</code></em>
. </p></td>
<td class="parameter_annotations"><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>
<div class="refsect3">
<a name="id-1.3.8.8.14.7"></a><h4>Returns</h4>
<p> <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when <em class="parameter"><code>func</code></em>
returned <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for each buffer in <em class="parameter"><code>list</code></em>
or when
<em class="parameter"><code>list</code></em>
is empty.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-list-get"></a><h3>gst_buffer_list_get ()</h3>
<pre class="programlisting"><a class="link" href="GstBuffer.html" title="GstBuffer"><span class="returnvalue">GstBuffer</span></a> *
gst_buffer_list_get (<em class="parameter"><code><a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a> *list</code></em>,
<em class="parameter"><code><a href="https://developer.gnome.org/glib/unstable/glib-Basic-Types.html#guint"><span class="type">guint</span></a> idx</code></em>);</pre>
<p>Get the buffer at <em class="parameter"><code>idx</code></em>
.</p>
<div class="refsect3">
<a name="id-1.3.8.8.15.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstBufferList.html" title="GstBufferList"><span class="type">GstBufferList</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>idx</p></td>
<td class="parameter_description"><p>the index</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.3.8.8.15.6"></a><h4>Returns</h4>
<p> the buffer at <em class="parameter"><code>idx</code></em>
in <em class="parameter"><code>group</code></em>
or <a href="https://developer.gnome.org/glib/unstable/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when there is no buffer. The buffer remains valid as
long as <em class="parameter"><code>list</code></em>
is valid and buffer is not removed from the list. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstBufferList.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstBufferList-struct"></a><h3>GstBufferList</h3>
<pre class="programlisting">typedef struct _GstBufferList GstBufferList;</pre>
<p>Opaque list of grouped buffers.</p>
</div>
</div>
<div class="refsect1">
<a name="GstBufferList.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstPad.html" title="GstPad"><span class="type">GstPad</span></a>, <a class="link" href="gstreamer-GstMiniObject.html#GstMiniObject" title="struct GstMiniObject"><span class="type">GstMiniObject</span></a></p>
</div>
</div>
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