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<a name="GstAudioAggregator"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GstAudioAggregator.top_of_page"></a>GstAudioAggregator</span></h2>
<p>GstAudioAggregator — Base class that manages a set of audio input pads
with the purpose of aggregating or mixing their raw audio input buffers</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstAudioAggregator.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody><tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstAudioAggregator.html#gst-audio-aggregator-set-sink-caps" title="gst_audio_aggregator_set_sink_caps ()">gst_audio_aggregator_set_sink_caps</a> <span class="c_punctuation">()</span>
</td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregator--alignment-threshold" title="The “alignment-threshold” property">alignment-threshold</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregator--discont-wait" title="The “discont-wait” property">discont-wait</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></td>
<td class="property_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregator--output-buffer-duration" title="The “output-buffer-duration” property">output-buffer-duration</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</td>
<td class="property_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorConvertPad--converter-config" title="The “converter-config” property">converter-config</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAudioAggregatorPad"></a><a name="GstAudioAggregatorConvertPad"></a><div class="refsect1">
<a name="GstAudioAggregator.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" 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="GstAudioAggregator.html#GstAudioAggregator-struct" title="struct GstAudioAggregator">GstAudioAggregator</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorClass" title="struct GstAudioAggregatorClass">GstAudioAggregatorClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorPad-struct" title="struct GstAudioAggregatorPad">GstAudioAggregatorPad</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorPadClass" title="struct GstAudioAggregatorPadClass">GstAudioAggregatorPadClass</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorConvertPad-struct" title="struct GstAudioAggregatorConvertPad">GstAudioAggregatorConvertPad</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorConvertPadClass" title="struct GstAudioAggregatorConvertPadClass">GstAudioAggregatorConvertPadClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen"> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html#GstObject-struct">GstObject</a>
<span class="lineart">├──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElement-struct">GstElement</a>
<span class="lineart">│</span> <span class="lineart">╰──</span> GstAggregator
<span class="lineart">│</span> <span class="lineart">╰──</span> GstAudioAggregator
<span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstPad-struct">GstPad</a>
<span class="lineart">╰──</span> GstAggregatorPad
<span class="lineart">╰──</span> GstAudioAggregatorPad
<span class="lineart">╰──</span> GstAudioAggregatorConvertPad
</pre>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <gst/audio/audio.h>
</pre>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.description"></a><h2>Description</h2>
<p>Subclasses must use (a subclass of) <a class="link" href="GstAudioAggregator.html#GstAudioAggregatorPad"><span class="type">GstAudioAggregatorPad</span></a> for both
their source and sink pads,
<code class="function">gst_element_class_add_static_pad_template_with_gtype()</code> is a convenient
helper.</p>
<p><a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a> can perform conversion on the data arriving
on its sink pads, based on the format expected downstream: in order
to enable that behaviour, the GType of the sink pads must either be
a (subclass of) <a class="link" href="GstAudioAggregator.html#GstAudioAggregatorConvertPad"><span class="type">GstAudioAggregatorConvertPad</span></a> to use the default
<a class="link" href="gst-plugins-base-libs-GstAudioConverter.html#GstAudioConverter" title="GstAudioConverter"><span class="type">GstAudioConverter</span></a> implementation, or a subclass of <a class="link" href="GstAudioAggregator.html#GstAudioAggregatorPad"><span class="type">GstAudioAggregatorPad</span></a>
implementing <span class="type">GstAudioAggregatorPad.convert_buffer</span>.</p>
<p>To allow for the output caps to change, the mechanism is the same as
above, with the GType of the source pad.</p>
<p>See <span class="type">GstAudioMixer</span> for an example.</p>
<p>When conversion is enabled, <a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a> will accept
any type of raw audio caps and perform conversion
on the data arriving on its sink pads, with whatever downstream
expects as the target format.</p>
<p>In case downstream caps are not fully fixated, it will use
the first configured sink pad to finish fixating its source pad
caps.</p>
<p>A notable exception for now is the sample rate, sink pads must
have the same sample rate as either the downstream requirement,
or the first configured pad, or a combination of both (when
downstream specifies a range or a set of acceptable rates).</p>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-audio-aggregator-set-sink-caps"></a><h3>gst_audio_aggregator_set_sink_caps ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_audio_aggregator_set_sink_caps (<em class="parameter"><code><a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a> *aagg</code></em>,
<em class="parameter"><code><a class="link" href="GstAudioAggregator.html#GstAudioAggregatorPad"><span class="type">GstAudioAggregatorPad</span></a> *pad</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
</div>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioAggregator-struct"></a><h3>struct GstAudioAggregator</h3>
<pre class="programlisting">struct GstAudioAggregator;</pre>
<p>GstAudioAggregator object</p>
<div class="refsect3">
<a name="GstAudioAggregator.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorClass"></a><h3>struct GstAudioAggregatorClass</h3>
<pre class="programlisting">struct GstAudioAggregatorClass {
GstAggregatorClass parent_class;
GstBuffer * (* create_output_buffer) (GstAudioAggregator * aagg,
guint num_frames);
gboolean (* aggregate_one_buffer) (GstAudioAggregator * aagg,
GstAudioAggregatorPad * pad, GstBuffer * inbuf, guint in_offset,
GstBuffer * outbuf, guint out_offset, guint num_frames);
};
</pre>
<div class="refsect3">
<a name="GstAudioAggregatorClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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><em class="structfield"><code><a name="GstAudioAggregatorClass.create-output-buffer"></a>create_output_buffer</code></em> ()</p></td>
<td class="struct_member_description"><p>Create a new output buffer contains num_frames frames.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioAggregatorClass.aggregate-one-buffer"></a>aggregate_one_buffer</code></em> ()</p></td>
<td class="struct_member_description"><p>Aggregates one input buffer to the output
buffer. The in_offset and out_offset are in "frames", which is
the size of a sample times the number of channels. Returns TRUE if
any non-silence was added to the buffer</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorPad-struct"></a><h3>struct GstAudioAggregatorPad</h3>
<pre class="programlisting">struct GstAudioAggregatorPad;</pre>
<p>The default implementation of GstPad used with <a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a></p>
<div class="refsect3">
<a name="GstAudioAggregatorPad.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorPadClass"></a><h3>struct GstAudioAggregatorPadClass</h3>
<pre class="programlisting">struct GstAudioAggregatorPadClass {
GstAggregatorPadClass parent_class;
GstBuffer * (* convert_buffer) (GstAudioAggregatorPad * pad,
GstAudioInfo *in_info,
GstAudioInfo *out_info,
GstBuffer * buffer);
void (* update_conversion_info) (GstAudioAggregatorPad *pad);
};
</pre>
<div class="refsect3">
<a name="GstAudioAggregatorPadClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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><em class="structfield"><code><a name="GstAudioAggregatorPadClass.convert-buffer"></a>convert_buffer</code></em> ()</p></td>
<td class="struct_member_description"><p>Convert a buffer from one format to another.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioAggregatorPadClass.update-conversion-info"></a>update_conversion_info</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when either the input or output
formats have changed.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorConvertPad-struct"></a><h3>struct GstAudioAggregatorConvertPad</h3>
<pre class="programlisting">struct GstAudioAggregatorConvertPad;</pre>
<p>An implementation of GstPad that can be used with <a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a>.</p>
<p>See <a class="link" href="GstAudioAggregator.html" title="GstAudioAggregator"><span class="type">GstAudioAggregator</span></a> for more details.</p>
<div class="refsect3">
<a name="GstAudioAggregatorConvertPad.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorConvertPadClass"></a><h3>struct GstAudioAggregatorConvertPadClass</h3>
<pre class="programlisting">struct GstAudioAggregatorConvertPadClass {
GstAudioAggregatorPadClass parent_class;
};
</pre>
</div>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioAggregator--alignment-threshold"></a><h3>The <code class="literal">“alignment-threshold”</code> property</h3>
<pre class="programlisting"> “alignment-threshold” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Timestamp alignment threshold in nanoseconds.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 18446744073709551614</p>
<p>Default value: 40000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregator--discont-wait"></a><h3>The <code class="literal">“discont-wait”</code> property</h3>
<pre class="programlisting"> “discont-wait” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Window of time in nanoseconds to wait before creating a discontinuity.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: <= 18446744073709551614</p>
<p>Default value: 1000000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregator--output-buffer-duration"></a><h3>The <code class="literal">“output-buffer-duration”</code> property</h3>
<pre class="programlisting"> “output-buffer-duration” <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint64"><span class="type">guint64</span></a></pre>
<p>Output block size in nanoseconds.</p>
<p>Flags: Read / Write</p>
<p>Allowed values: >= 1</p>
<p>Default value: 10000000</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioAggregatorConvertPad--converter-config"></a><h3>The <code class="literal">“converter-config”</code> property</h3>
<pre class="programlisting"> “converter-config” <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstStructure.html#GstStructure-struct"><span class="type">GstStructure</span></a> *</pre>
<p>A GstStructure describing the configuration that should be used when converting this pad's audio buffers.</p>
<p>Flags: Read / Write</p>
</div>
</div>
<div class="refsect1">
<a name="GstAudioAggregator.see-also"></a><h2>See Also</h2>
<p><span class="type">GstAggregator</span>, <span class="type">GstAudioMixer</span></p>
</div>
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