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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GStreamer Base Plugins 1.0 Library Reference Manual: gstaudiometa</title>
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                  <a href="#gst-plugins-base-libs-gstaudiometa.object-hierarchy" class="shortcut">Object Hierarchy</a></span>
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<div class="refentry">
<a name="gst-plugins-base-libs-gstaudiometa"></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-gstaudiometa.top_of_page"></a>gstaudiometa</span></h2>
<p>gstaudiometa</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.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="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="returnvalue">GstAudioDownmixMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiometa.html#gst-buffer-add-audio-downmix-meta" title="gst_buffer_add_audio_downmix_meta ()">gst_buffer_add_audio_downmix_meta</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiometa.html#gst-buffer-get-audio-downmix-meta" title="gst_buffer_get_audio_downmix_meta()">gst_buffer_get_audio_downmix_meta</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="returnvalue">GstAudioDownmixMeta</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiometa.html#gst-buffer-get-audio-downmix-meta-for-channels" title="gst_buffer_get_audio_downmix_meta_for_channels ()">gst_buffer_get_audio_downmix_meta_for_channels</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.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">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta">GstAudioDownmixMeta</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/audio/gstaudiometa.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-buffer-add-audio-downmix-meta"></a><h3>gst_buffer_add_audio_downmix_meta ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="returnvalue">GstAudioDownmixMeta</span></a> *
gst_buffer_add_audio_downmix_meta (<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>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *from_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> from_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> *to_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> to_channels</code></em>,
                                   <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> **matrix</code></em>);</pre>
<p>Attaches GstAudioDownmixMeta metadata to <em class="parameter"><code>buffer</code></em>
 with the given parameters.</p>
<p><em class="parameter"><code>matrix</code></em>
 is an two-dimensional array of <em class="parameter"><code>to_channels</code></em>
 times <em class="parameter"><code>from_channels</code></em>

coefficients, i.e. the i-th output channels is constructed by multiplicating
the input channels with the coefficients in <em class="parameter"><code>matrix</code></em>
[i] and taking the sum
of the results.</p>
<div class="refsect3">
<a name="id-1.2.6.4.8.2.6"></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>buffer</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>from_position</p></td>
<td class="parameter_description"><p> the channel positions
of the source. </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=from_channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>from_channels</p></td>
<td class="parameter_description"><p>The number of channels of the source</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>to_position</p></td>
<td class="parameter_description"><p> the channel positions of
the destination. </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=to_channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>to_channels</p></td>
<td class="parameter_description"><p>The number of channels of the destination</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>matrix</p></td>
<td class="parameter_description"><p>The matrix coefficients.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.4.8.2.7"></a><h4>Returns</h4>
<p> the <a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="type">GstAudioDownmixMeta</span></a> on <em class="parameter"><code>buffer</code></em>
.</p>
<p></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-audio-downmix-meta"></a><h3>gst_buffer_get_audio_downmix_meta()</h3>
<pre class="programlisting">#define gst_buffer_get_audio_downmix_meta(b) ((GstAudioDownmixMeta*)gst_buffer_get_meta((b),GST_AUDIO_DOWNMIX_META_INFO))
</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-buffer-get-audio-downmix-meta-for-channels"></a><h3>gst_buffer_get_audio_downmix_meta_for_channels ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="returnvalue">GstAudioDownmixMeta</span></a> *
gst_buffer_get_audio_downmix_meta_for_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>const <a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *to_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> to_channels</code></em>);</pre>
<p>Find the <a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="type">GstAudioDownmixMeta</span></a> on <em class="parameter"><code>buffer</code></em>
 for the given destination
channel positions.</p>
<div class="refsect3">
<a name="id-1.2.6.4.8.4.5"></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>buffer</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>to_position</p></td>
<td class="parameter_description"><p> the channel positions of
the destination. </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=to_channels]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>to_channels</p></td>
<td class="parameter_description"><p>The number of channels of the destination</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.4.8.4.6"></a><h4>Returns</h4>
<p> the <a class="link" href="gst-plugins-base-libs-gstaudiometa.html#GstAudioDownmixMeta" title="struct GstAudioDownmixMeta"><span class="type">GstAudioDownmixMeta</span></a> on <em class="parameter"><code>buffer</code></em>
.</p>
<p></p>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiometa.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioDownmixMeta"></a><h3>struct GstAudioDownmixMeta</h3>
<pre class="programlisting">struct GstAudioDownmixMeta {
  GstMeta      meta;

  GstAudioChannelPosition *from_position;
  GstAudioChannelPosition *to_position;
  gint        from_channels, to_channels;
  gfloat       **matrix;
};
</pre>
<p>Extra buffer metadata describing audio downmixing matrix. This metadata is
attached to audio buffers and contains a matrix to downmix the buffer number
of channels to <em class="parameter"><code>channels</code></em>
.</p>
<p><em class="parameter"><code>matrix</code></em>
 is an two-dimensional array of <em class="parameter"><code>to_channels</code></em>
 times <em class="parameter"><code>from_channels</code></em>

coefficients, i.e. the i-th output channels is constructed by multiplicating
the input channels with the coefficients in <em class="parameter"><code>matrix</code></em>
[i] and taking the sum
of the results.</p>
<div class="refsect3">
<a name="id-1.2.6.4.9.2.6"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMeta.html#GstMeta"><span class="type">GstMeta</span></a> <em class="structfield"><code><a name="GstAudioDownmixMeta.meta"></a>meta</code></em>;</p></td>
<td class="struct_member_description"><p>parent <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstMeta.html#GstMeta"><span class="type">GstMeta</span></a></p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *<em class="structfield"><code><a name="GstAudioDownmixMeta.from-position"></a>from_position</code></em>;</p></td>
<td class="struct_member_description"><p>the channel positions of the source</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="gst-plugins-base-libs-gstaudiochannels.html#GstAudioChannelPosition" title="enum GstAudioChannelPosition"><span class="type">GstAudioChannelPosition</span></a> *<em class="structfield"><code><a name="GstAudioDownmixMeta.to-position"></a>to_position</code></em>;</p></td>
<td class="struct_member_description"><p>the channel positions of the destination</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstAudioDownmixMeta.from-channels"></a>from_channels</code></em>;</p></td>
<td class="struct_member_description"><p>the number of channels of the source</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> <em class="structfield"><code><a name="GstAudioDownmixMeta.to-channels"></a>to_channels</code></em>;</p></td>
<td class="struct_member_description"><p>the number of channels of the destination</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gfloat"><span class="type">gfloat</span></a> **<em class="structfield"><code><a name="GstAudioDownmixMeta.matrix"></a>matrix</code></em>;</p></td>
<td class="struct_member_description"><p>the matrix coefficients.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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