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<a href="#gst-plugins-base-libs-gstaudiosrc.description" class="shortcut">Description</a>
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<a href="#gst-plugins-base-libs-gstaudiosrc.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<div class="refentry">
<a name="gst-plugins-base-libs-gstaudiosrc"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstaudiosrc.top_of_page"></a>gstaudiosrc</span></h2>
<p>gstaudiosrc — Simple base class for audio sources</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudiosrc.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioSrc"></a><pre class="synopsis">
#include <gst/audio/gstaudiosrc.h>
struct <a class="link" href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc-struct" title="struct GstAudioSrc">GstAudioSrc</a>;
struct <a class="link" href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrcClass" title="struct GstAudioSrcClass">GstAudioSrcClass</a>;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiosrc.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
<a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstObject.html">GstObject</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html">GstElement</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseSrc.html">GstBaseSrc</a>
+----<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstPushSrc.html">GstPushSrc</a>
+----<a class="link" href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc">GstBaseAudioSrc</a>
+----GstAudioSrc
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-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>
<p>
</p>
<div class="variablelist"><table border="0">
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<td><p><span class="term"><code class="function">open()</code></span></p></td>
<td><p>Open the device.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">prepare()</code></span></p></td>
<td><p>Configure the device with the specified format.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">read()</code></span></p></td>
<td><p>Read samples from the device.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">reset()</code></span></p></td>
<td><p>Unblock reads and flush the device.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">delay()</code></span></p></td>
<td><p>Get the number of samples in the device but not yet read.
</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">unprepare()</code></span></p></td>
<td><p>Undo operations done by prepare.</p></td>
</tr>
<tr>
<td><p><span class="term"><code class="function">close()</code></span></p></td>
<td><p>Close the device.</p></td>
</tr>
</tbody>
</table></div>
<p>
</p>
<p>
All scheduling of samples and timestamps is done in this base class
together with <a class="link" href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc"><span class="type">GstBaseAudioSrc</span></a> using a default implementation of a
<a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a> that uses threads.
</p>
<p>
Last reviewed on 2006-09-27 (0.10.12)
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiosrc.details"></a><h2>Details</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>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioSrcClass"></a><h3>struct GstAudioSrcClass</h3>
<pre class="programlisting">struct GstAudioSrcClass {
GstBaseAudioSrcClass 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, GstRingBufferSpec *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);
/* get number of samples 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="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc"><span class="type">GstAudioSrc</span></a> class. Override the vmethod to implement
functionality.
</p>
<div class="variablelist"><table border="0">
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<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrcClass" title="struct GstBaseAudioSrcClass"><span class="type">GstBaseAudioSrcClass</span></a> <em class="structfield"><code><a name="GstAudioSrcClass.parent-class"></a>parent_class</code></em>;</span></p></td>
<td>the parent class.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.open"></a>open</code></em> ()</span></p></td>
<td>open the device with the specified caps</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.prepare"></a>prepare</code></em> ()</span></p></td>
<td>configure device with format</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.unprepare"></a>unprepare</code></em> ()</span></p></td>
<td>undo the configuration</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.close"></a>close</code></em> ()</span></p></td>
<td>close the device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.read"></a>read</code></em> ()</span></p></td>
<td>read samples to the audio device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.delay"></a>delay</code></em> ()</span></p></td>
<td>the number of samples queued in the device</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioSrcClass.reset"></a>reset</code></em> ()</span></p></td>
<td>unblock a read to the device and reset.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiosrc.see-also"></a><h2>See Also</h2>
<a class="link" href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc"><span class="type">GstBaseAudioSrc</span></a>, <a class="link" href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>, <a class="link" href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc"><span class="type">GstAudioSrc</span></a>.
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