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<title>GstAudioSrc: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<a name="GstAudioSrc"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="GstAudioSrc.top_of_page"></a>GstAudioSrc</span></h2>
<p>GstAudioSrc — Simple base class for audio sources</p>
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<div class="refsect1">
<a name="GstAudioSrc.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
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<col width="150px" class="name">
<col class="description">
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<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioSrc.html#GstAudioSrc-struct" title="struct GstAudioSrc">GstAudioSrc</a></td>
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<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="GstAudioSrc.html#GstAudioSrcClass" title="struct GstAudioSrcClass">GstAudioSrcClass</a></td>
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</table></div>
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<div class="refsect1">
<a name="GstAudioSrc.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> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html#GstBaseSrc-struct">GstBaseSrc</a>
                    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstPushSrc.html#GstPushSrc-struct">GstPushSrc</a>
                        <span class="lineart">╰──</span> <a class="link" href="GstAudioBaseSrc.html" title="GstAudioBaseSrc">GstAudioBaseSrc</a>
                            <span class="lineart">╰──</span> GstAudioSrc
</pre>
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<div class="refsect1">
<a name="GstAudioSrc.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/audio/gstaudiosrc.h&gt;
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<div class="refsect1">
<a name="GstAudioSrc.description"></a><h2>Description</h2>
<p>This is the most simple base class for audio sources that only requires
subclasses to implement a set of simple functions:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><p><code class="literal"><code class="function">open()</code></code> :Open the device.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">prepare()</code></code> :Configure the device with the specified format.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">read()</code></code> :Read samples from the device.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">reset()</code></code> :Unblock reads and flush the device.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">delay()</code></code> :Get the number of samples in the device but not yet read.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">unprepare()</code></code> :Undo operations done by prepare.</p></li>
<li class="listitem"><p><code class="literal"><code class="function">close()</code></code> :Close the device.</p></li>
</ul></div>
<p>All scheduling of samples and timestamps is done in this base class
together with <a class="link" href="GstAudioBaseSrc.html" title="GstAudioBaseSrc"><span class="type">GstAudioBaseSrc</span></a> using a default implementation of a
<a class="link" href="GstAudioRingBuffer.html" title="GstAudioRingBuffer"><span class="type">GstAudioRingBuffer</span></a> that uses threads.</p>
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<div class="refsect1">
<a name="GstAudioSrc.functions_details"></a><h2>Functions</h2>
<p></p>
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<div class="refsect1">
<a name="GstAudioSrc.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAudioSrc-struct"></a><h3>struct GstAudioSrc</h3>
<pre class="programlisting">struct GstAudioSrc;</pre>
<p>Base class for simple audio sources.</p>
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<hr>
<div class="refsect2">
<a name="GstAudioSrcClass"></a><h3>struct GstAudioSrcClass</h3>
<pre class="programlisting">struct GstAudioSrcClass {
  GstAudioBaseSrcClass parent_class;

  /* vtable */

  /* open the device with given specs */
  gboolean (*open)      (GstAudioSrc *src);
  /* prepare resources and state to operate with the given specs */
  gboolean (*prepare)   (GstAudioSrc *src, GstAudioRingBufferSpec *spec);
  /* undo anything that was done in prepare() */
  gboolean (*unprepare) (GstAudioSrc *src);
  /* close the device */
  gboolean (*close)     (GstAudioSrc *src);
  /* read samples from the device */
  guint    (*read)      (GstAudioSrc *src, gpointer data, guint length,
      GstClockTime *timestamp);
  /* get number of frames queued in the device */
  guint    (*delay)     (GstAudioSrc *src);
  /* reset the audio device, unblock from a write */
  void     (*reset)     (GstAudioSrc *src);
};
</pre>
<p><a class="link" href="GstAudioSrc.html" title="GstAudioSrc"><span class="type">GstAudioSrc</span></a> class. Override the vmethod to implement
functionality.</p>
<div class="refsect3">
<a name="GstAudioSrcClass.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">
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<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.open"></a>open</code></em> ()</p></td>
<td class="struct_member_description"><p>open the device with the specified caps</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.prepare"></a>prepare</code></em> ()</p></td>
<td class="struct_member_description"><p>configure device with format</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.unprepare"></a>unprepare</code></em> ()</p></td>
<td class="struct_member_description"><p>undo the configuration</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.close"></a>close</code></em> ()</p></td>
<td class="struct_member_description"><p>close the device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.read"></a>read</code></em> ()</p></td>
<td class="struct_member_description"><p>read samples from the audio device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.delay"></a>delay</code></em> ()</p></td>
<td class="struct_member_description"><p>the number of frames queued in the device</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioSrcClass.reset"></a>reset</code></em> ()</p></td>
<td class="struct_member_description"><p>unblock a read to the device and reset.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
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<div class="refsect1">
<a name="GstAudioSrc.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstAudioBaseSrc.html" title="GstAudioBaseSrc"><span class="type">GstAudioBaseSrc</span></a>, <a class="link" href="GstAudioRingBuffer.html" title="GstAudioRingBuffer"><span class="type">GstAudioRingBuffer</span></a>, <a class="link" href="GstAudioSrc.html" title="GstAudioSrc"><span class="type">GstAudioSrc</span></a>.</p>
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