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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>GStreamer Base Plugins 1.0 Library Reference Manual: gstaudiochannels</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
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</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="10"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstaudiochannels.description" class="shortcut">Description</a></span><span id="nav_hierarchy"> <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstaudiochannels.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-audio.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="gst-plugins-base-libs-gstaudiobasesrc.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
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</tr></table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstaudiochannels"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstaudiochannels.top_of_page"></a>gstaudiochannels</span></h2>
<p>gstaudiochannels</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.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="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GST-AUDIO-CHANNEL-POSITION-MASK:CAPS" title="GST_AUDIO_CHANNEL_POSITION_MASK()">GST_AUDIO_CHANNEL_POSITION_MASK</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-channel-positions-to-mask" title="gst_audio_channel_positions_to_mask ()">gst_audio_channel_positions_to_mask</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-channel-positions-from-mask" title="gst_audio_channel_positions_from_mask ()">gst_audio_channel_positions_from_mask</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-channel-positions-to-valid-order" title="gst_audio_channel_positions_to_valid_order ()">gst_audio_channel_positions_to_valid_order</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-check-valid-channel-positions" title="gst_audio_check_valid_channel_positions ()">gst_audio_check_valid_channel_positions</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-buffer-reorder-channels" title="gst_audio_buffer_reorder_channels ()">gst_audio_buffer_reorder_channels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-reorder-channels" title="gst_audio_reorder_channels ()">gst_audio_reorder_channels</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-get-channel-reorder-map" title="gst_audio_get_channel_reorder_map ()">gst_audio_get_channel_reorder_map</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.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">enum</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition">GstAudioChannelPosition</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/audio/audio-channels.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GST-AUDIO-CHANNEL-POSITION-MASK:CAPS"></a><h3>GST_AUDIO_CHANNEL_POSITION_MASK()</h3>
<pre class="programlisting">#define GST_AUDIO_CHANNEL_POSITION_MASK(pos) (G_GUINT64_CONSTANT(1)&lt;&lt; GST_AUDIO_CHANNEL_POSITION_ ## pos)
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-channel-positions-to-mask"></a><h3>gst_audio_channel_positions_to_mask ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_channel_positions_to_mask (<em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *position</code></em>,
                                     <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                                     <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> force_order</code></em>,
                                     <em class="parameter"><code><span class="type">guint64</span> *channel_mask</code></em>);</pre>
<p>Convert the <em class="parameter"><code>position</code></em>
 array of <em class="parameter"><code>channels</code></em>
 channels to a bitmask.</p>
<p>If <em class="parameter"><code>force_order</code></em>
 is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> it additionally checks if the channels are
in the order required by GStreamer.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.3.6"></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>position</p></td>
<td class="parameter_description"><p> The <a href="../gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition"><code class="literal">GstAudioChannelPositions</code></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>force_order</p></td>
<td class="parameter_description"><p>Only consider the GStreamer channel order.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel_mask</p></td>
<td class="parameter_description"><p> the output channel mask. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.3.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the channel positions are valid and could be converted.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-channel-positions-from-mask"></a><h3>gst_audio_channel_positions_from_mask ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_channel_positions_from_mask (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                                       <em class="parameter"><code><span class="type">guint64</span> channel_mask</code></em>,
                                       <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *position</code></em>);</pre>
<p>Convert the <em class="parameter"><code>channels</code></em>
 present in <em class="parameter"><code>channel_mask</code></em>
 to a <em class="parameter"><code>position</code></em>
 array
(which should have at least <em class="parameter"><code>channels</code></em>
 entries ensured by caller).
If <em class="parameter"><code>channel_mask</code></em>
 is set to 0, it is considered as 'not present' for purpose
of conversion.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.4.5"></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>channels</p></td>
<td class="parameter_description"><p>The number of channels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channel_mask</p></td>
<td class="parameter_description"><p>The input channel_mask</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>position</p></td>
<td class="parameter_description"><p> The
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><code class="literal">GstAudioChannelPosition</code></a>s. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=channels]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.4.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if channel and channel mask are valid and could be converted</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-channel-positions-to-valid-order"></a><h3>gst_audio_channel_positions_to_valid_order ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_channel_positions_to_valid_order
                               (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *position</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>);</pre>
<p>Reorders the channel positions in <em class="parameter"><code>position</code></em>
 from any order to
the GStreamer channel order.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.5.5"></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>position</p></td>
<td class="parameter_description"><p> The channel positions to
reorder to. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.5.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the channel positions are valid and reordering
was successful.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-check-valid-channel-positions"></a><h3>gst_audio_check_valid_channel_positions ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_check_valid_channel_positions
                               (<em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *position</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> force_order</code></em>);</pre>
<p>Checks if <em class="parameter"><code>position</code></em>
 contains valid channel positions for
<em class="parameter"><code>channels</code></em>
 channels. If <em class="parameter"><code>force_order</code></em>
 is <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> it additionally
checks if the channels are in the order required by GStreamer.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.6.5"></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>position</p></td>
<td class="parameter_description"><p> The <a href="../gst-plugins-base-libs-1.0/gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition"><code class="literal">GstAudioChannelPositions</code></a>
to check. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>force_order</p></td>
<td class="parameter_description"><p>Only consider the GStreamer channel order.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.6.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the channel positions are valid.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-buffer-reorder-channels"></a><h3>gst_audio_buffer_reorder_channels ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_buffer_reorder_channels (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buffer</code></em>,
                                   <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><span class="type">GstAudioFormat</span></a> format</code></em>,
                                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                                   <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *from</code></em>,
                                   <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *to</code></em>);</pre>
<p>Reorders <em class="parameter"><code>buffer</code></em>
 from the channel positions <em class="parameter"><code>from</code></em>
 to the channel
positions <em class="parameter"><code>to</code></em>
. <em class="parameter"><code>from</code></em>
 and <em class="parameter"><code>to</code></em>
 must contain the same number of
positions and the same positions, only in a different order.
<em class="parameter"><code>buffer</code></em>
 must be writable.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.7.5"></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>buffer</p></td>
<td class="parameter_description"><p>The buffer to reorder.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>The <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><code class="literal">GstAudioFormat</code></a> of the buffer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from</p></td>
<td class="parameter_description"><p> The channel positions in the buffer. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>to</p></td>
<td class="parameter_description"><p> The channel positions to convert to. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.7.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the reordering was possible.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-reorder-channels"></a><h3>gst_audio_reorder_channels ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_reorder_channels (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> data</code></em>,
                            <em class="parameter"><code><span class="type">gsize</span> size</code></em>,
                            <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><span class="type">GstAudioFormat</span></a> format</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                            <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *from</code></em>,
                            <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *to</code></em>);</pre>
<p>Reorders <em class="parameter"><code>data</code></em>
 from the channel positions <em class="parameter"><code>from</code></em>
 to the channel
positions <em class="parameter"><code>to</code></em>
. <em class="parameter"><code>from</code></em>
 and <em class="parameter"><code>to</code></em>
 must contain the same number of
positions and the same positions, only in a different order.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.8.5"></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>data</p></td>
<td class="parameter_description"><p> The pointer to
the memory. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> length=size][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> guint8]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>The size of the memory.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>format</p></td>
<td class="parameter_description"><p>The <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><code class="literal">GstAudioFormat</code></a> of the buffer.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from</p></td>
<td class="parameter_description"><p> The channel positions in the buffer. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>to</p></td>
<td class="parameter_description"><p> The channel positions to convert to. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.8.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the reordering was possible.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-get-channel-reorder-map"></a><h3>gst_audio_get_channel_reorder_map ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_audio_get_channel_reorder_map (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> channels</code></em>,
                                   <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *from</code></em>,
                                   <em class="parameter"><code>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *to</code></em>,
                                   <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> *reorder_map</code></em>);</pre>
<p>Returns a reorder map for <em class="parameter"><code>from</code></em>
 to <em class="parameter"><code>to</code></em>
 that can be used in
custom channel reordering code, e.g. to convert from or to the
GStreamer channel order. <em class="parameter"><code>from</code></em>
 and <em class="parameter"><code>to</code></em>
 must contain the same
number of positions and the same positions, only in a
different order.</p>
<p>The resulting <em class="parameter"><code>reorder_map</code></em>
 can be used for reordering by assigning
channel i of the input to channel reorder_map[i] of the output.</p>
<div class="refsect3">
<a name="id-1.2.6.15.8.9.6"></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>channels</p></td>
<td class="parameter_description"><p>The number of channels.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from</p></td>
<td class="parameter_description"><p> The channel positions to reorder from. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>to</p></td>
<td class="parameter_description"><p> The channel positions to reorder to. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>reorder_map</p></td>
<td class="parameter_description"><p> Pointer to the reorder map. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.15.8.9.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the channel positions are valid and reordering
is possible.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiochannels.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioChannelPosition"></a><h3>enum GstAudioChannelPosition</h3>
<p>Audio channel positions.</p>
<p>These are the channels defined in SMPTE 2036-2-2008
Table 1 for 22.2 audio systems with the Surround and Wide channels from
DTS Coherent Acoustics (v.1.3.1) and 10.2 and 7.1 layouts. In the caps the
actual channel layout is expressed with a channel count and a channel mask,
which describes the existing channels. The positions in the bit mask correspond
to the enum values.
For negotiation it is allowed to have more bits set in the channel mask than
the number of channels to specify the allowed channel positions but this is
not allowed in negotiated caps. It is not allowed in any situation other
than the one mentioned below to have less bits set in the channel mask than
the number of channels.</p>
<p><em class="parameter"><code>GST_AUDIO_CHANNEL_POSITION_MONO</code></em>
 can only be used with a single mono channel that
has no direction information and would be mixed into all directional channels.
This is expressed in caps by having a single channel and no channel mask.</p>
<p><em class="parameter"><code>GST_AUDIO_CHANNEL_POSITION_NONE</code></em>
 can only be used if all channels have this position.
This is expressed in caps by having a channel mask with no bits set.</p>
<p>As another special case it is allowed to have two channels without a channel mask.
This implicitely means that this is a stereo stream with a front left and front right
channel.</p>
<div class="refsect3">
<a name="id-1.2.6.15.9.2.8"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-NONE:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_NONE</p></td>
<td class="enum_member_description">
<p>used for position-less channels, e.g.
    from a sound card that records 1024 channels; mutually exclusive with
    any other channel position</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-MONO:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_MONO</p></td>
<td class="enum_member_description">
<p>Mono without direction;
    can only be used with 1 channel</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-INVALID:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_INVALID</p></td>
<td class="enum_member_description">
<p>invalid position</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT</p></td>
<td class="enum_member_description">
<p>Front left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT</p></td>
<td class="enum_member_description">
<p>Front right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER</p></td>
<td class="enum_member_description">
<p>Front center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-LFE1:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_LFE1</p></td>
<td class="enum_member_description">
<p>Low-frequency effects 1 (subwoofer)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_REAR_LEFT</p></td>
<td class="enum_member_description">
<p>Rear left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT</p></td>
<td class="enum_member_description">
<p>Rear right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-LEFT-OF-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER</p></td>
<td class="enum_member_description">
<p>Front left of center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-RIGHT-OF-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER</p></td>
<td class="enum_member_description">
<p>Front right of center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_REAR_CENTER</p></td>
<td class="enum_member_description">
<p>Rear center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-LFE2:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_LFE2</p></td>
<td class="enum_member_description">
<p>Low-frequency effects 2 (subwoofer)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-SIDE-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT</p></td>
<td class="enum_member_description">
<p>Side left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-SIDE-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT</p></td>
<td class="enum_member_description">
<p>Side right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT</p></td>
<td class="enum_member_description">
<p>Top front left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT</p></td>
<td class="enum_member_description">
<p>Top front right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER</p></td>
<td class="enum_member_description">
<p>Top front center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_CENTER</p></td>
<td class="enum_member_description">
<p>Top center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT</p></td>
<td class="enum_member_description">
<p>Top rear left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT</p></td>
<td class="enum_member_description">
<p>Top rear right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-SIDE-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT</p></td>
<td class="enum_member_description">
<p>Top side right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-SIDE-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT</p></td>
<td class="enum_member_description">
<p>Top rear right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER</p></td>
<td class="enum_member_description">
<p>Top rear center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-CENTER:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER</p></td>
<td class="enum_member_description">
<p>Bottom front center</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT</p></td>
<td class="enum_member_description">
<p>Bottom front left</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT</p></td>
<td class="enum_member_description">
<p>Bottom front right</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-WIDE-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT</p></td>
<td class="enum_member_description">
<p>Wide left (between front left and side left)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-WIDE-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT</p></td>
<td class="enum_member_description">
<p>Wide right (between front right and side right)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-SURROUND-LEFT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT</p></td>
<td class="enum_member_description">
<p>Surround left (between rear left and side left)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-AUDIO-CHANNEL-POSITION-SURROUND-RIGHT:CAPS"></a>GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT</p></td>
<td class="enum_member_description">
<p>Surround right (between rear right and side right)</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
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