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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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                  <a href="#gst-plugins-base-libs-gstaudiochannels.description" class="shortcut">Description</a>
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<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>
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<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudiochannels.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include &lt;gst/audio/audio-channels.h&gt;

enum                <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition">GstAudioChannelPosition</a>;
#define             <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>     (pos)
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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> (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>
                                                        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>
                                                        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>
                                                        (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>   (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#gst-audio-reorder-channels" title="gst_audio_reorder_channels ()">gst_audio_reorder_channels</a>          (<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>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <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>   (<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>
</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.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioChannelPosition"></a><h3>enum GstAudioChannelPosition</h3>
<pre class="programlisting">typedef enum {
  /* These get negative indices to allow to use
   * the enum values of the normal cases for the
   * bit-mask position */
  GST_AUDIO_CHANNEL_POSITION_NONE = -3,
  GST_AUDIO_CHANNEL_POSITION_MONO = -2,
  GST_AUDIO_CHANNEL_POSITION_INVALID = -1,

  /* Normal cases */
  GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT = 0,
  GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER,
  GST_AUDIO_CHANNEL_POSITION_LFE1,
  GST_AUDIO_CHANNEL_POSITION_REAR_LEFT,
  GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER,
  GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER,
  GST_AUDIO_CHANNEL_POSITION_REAR_CENTER,
  GST_AUDIO_CHANNEL_POSITION_LFE2,
  GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT,
  GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT,
  GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER,
  GST_AUDIO_CHANNEL_POSITION_TOP_CENTER,
  GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT,
  GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT,
  GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER,
  GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER,
  GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT,
  GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT,
  GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT,
  GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT,
  GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT
} GstAudioChannelPosition;
</pre>
<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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-NONE:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_NONE</code></span></p></td>
<td>used for position-less channels, e.g.
    from a sound card that records 1024 channels; mutually exclusive with
    any other channel position
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-MONO:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_MONO</code></span></p></td>
<td>Mono without direction;
    can only be used with 1 channel
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-INVALID:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_INVALID</code></span></p></td>
<td>invalid position
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT</code></span></p></td>
<td>Front left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT</code></span></p></td>
<td>Front right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_FRONT_CENTER</code></span></p></td>
<td>Front center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-LFE1:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_LFE1</code></span></p></td>
<td>Low-frequency effects 1 (subwoofer)
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_REAR_LEFT</code></span></p></td>
<td>Rear left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_REAR_RIGHT</code></span></p></td>
<td>Rear right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-LEFT-OF-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_FRONT_LEFT_OF_CENTER</code></span></p></td>
<td>Front left of center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-FRONT-RIGHT-OF-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_FRONT_RIGHT_OF_CENTER</code></span></p></td>
<td>Front right of center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-REAR-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_REAR_CENTER</code></span></p></td>
<td>Rear center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-LFE2:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_LFE2</code></span></p></td>
<td>Low-frequency effects 2 (subwoofer)
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-SIDE-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_SIDE_LEFT</code></span></p></td>
<td>Side left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-SIDE-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_SIDE_RIGHT</code></span></p></td>
<td>Side right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_LEFT</code></span></p></td>
<td>Top front left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_RIGHT</code></span></p></td>
<td>Top front right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-FRONT-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_FRONT_CENTER</code></span></p></td>
<td>Top front center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_CENTER</code></span></p></td>
<td>Top center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_REAR_LEFT</code></span></p></td>
<td>Top rear left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_REAR_RIGHT</code></span></p></td>
<td>Top rear right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-SIDE-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_LEFT</code></span></p></td>
<td>Top side right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-SIDE-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_SIDE_RIGHT</code></span></p></td>
<td>Top rear right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-TOP-REAR-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_TOP_REAR_CENTER</code></span></p></td>
<td>Top rear center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-CENTER:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_CENTER</code></span></p></td>
<td>Bottom front center
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_LEFT</code></span></p></td>
<td>Bottom front left
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-BOTTOM-FRONT-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_BOTTOM_FRONT_RIGHT</code></span></p></td>
<td>Bottom front right
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-WIDE-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_WIDE_LEFT</code></span></p></td>
<td>Wide left (between front left and side left)
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-WIDE-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_WIDE_RIGHT</code></span></p></td>
<td>Wide right (between front right and side right)
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-SURROUND-LEFT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_SURROUND_LEFT</code></span></p></td>
<td>Surround left (between rear left and side left)
</td>
</tr>
<tr>
<td><p><a name="GST-AUDIO-CHANNEL-POSITION-SURROUND-RIGHT:CAPS"></a><span class="term"><code class="literal">GST_AUDIO_CHANNEL_POSITION_SURROUND_RIGHT</code></span></p></td>
<td>Surround right (between rear right and side right)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition"><code class="literal">GstAudioChannelPositions</code></a>. <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><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>force_order</code></em> :</span></p></td>
<td>Only consider the GStreamer channel order.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel_mask</code></em> :</span></p></td>
<td>the output channel mask. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channel_mask</code></em> :</span></p></td>
<td>The input channel_mask</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The
<a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><code class="literal">GstAudioChannelPosition</code></a>s. <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><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The channel positions to
reorder to. <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><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>position</code></em> :</span></p></td>
<td>The <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-base-libs/html/gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition"><code class="literal">GstAudioChannelPositions</code></a>
to check. <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><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>force_order</code></em> :</span></p></td>
<td>Only consider the GStreamer channel order.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>The buffer to reorder.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><code class="literal">GstAudioFormat</code></a> of the buffer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>from</code></em> :</span></p></td>
<td>The channel positions in the buffer. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>to</code></em> :</span></p></td>
<td>The channel positions to convert to. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>The pointer to
the memory. <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><p><span class="term"><em class="parameter"><code>size</code></em> :</span></p></td>
<td>The size of the memory.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>The <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioFormat" title="enum GstAudioFormat"><code class="literal">GstAudioFormat</code></a> of the buffer.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>from</code></em> :</span></p></td>
<td>The channel positions in the buffer. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>to</code></em> :</span></p></td>
<td>The channel positions to convert to. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>channels</code></em> :</span></p></td>
<td>The number of channels.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>from</code></em> :</span></p></td>
<td>The channel positions to reorder from. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>to</code></em> :</span></p></td>
<td>The channel positions to reorder to. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>reorder_map</code></em> :</span></p></td>
<td>Pointer to the reorder map. <span class="annotation">[<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<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.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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