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<a name="gst-plugins-base-libs-gstaudiosrc"></a><div class="titlepage"></div>
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<h2>
<a name="id2569265"></a><span class="refentrytitle">gstaudiosrc</span>
</h2>
<p>gstaudiosrc — Simple base class for audio sources</p>
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<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<a name="GstAudioSrc"></a><pre class="synopsis">
#include <gst/audio/gstaudiosrc.h>
<a href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc-struct">GstAudioSrc</a>;
<a href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrcClass">GstAudioSrcClass</a>;
</pre>
</div>
<div class="refsect1" lang="en">
<a name="id2569300"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GObject
+----GstObject
+----GstElement
+----GstBaseSrc
+----GstPushSrc
+----<a href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc">GstBaseAudioSrc</a>
+----GstAudioSrc
</pre>
</div>
<div class="refsect1" lang="en">
<a name="id2569361"></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>
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<td><span class="term"><code class="function">open()</code></span></td>
<td><p>Open the device.</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">prepare()</code></span></td>
<td><p>Configure the device with the specified format.</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">read()</code></span></td>
<td><p>Read samples from the device.</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">reset()</code></span></td>
<td><p>Unblock reads and flush the device.</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">delay()</code></span></td>
<td><p>Get the number of samples in the device but not yet read.
</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">unprepare()</code></span></td>
<td><p>Undo operations done by prepare.</p></td>
</tr>
<tr>
<td><span class="term"><code class="function">close()</code></span></td>
<td><p>Close the device.</p></td>
</tr>
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</table></div>
<p>
</p>
<p>
All scheduling of samples and timestamps is done in this base class
together with <a href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc"><span class="type">GstBaseAudioSrc</span></a> using a default implementation of a
<a 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>
<p>
</p>
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<div class="refsect1" lang="en">
<a name="id2569549"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="id2569559"></a><h3>
<a name="GstAudioSrc-struct"></a>GstAudioSrc</h3>
<a class="indexterm" name="id2569572"></a><pre class="programlisting">typedef struct _GstAudioSrc GstAudioSrc;</pre>
<p>
</p>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="id2569587"></a><h3>
<a name="GstAudioSrcClass"></a>GstAudioSrcClass</h3>
<a class="indexterm" name="id2569599"></a><pre class="programlisting">typedef struct {
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);
} GstAudioSrcClass;
</pre>
<p>
</p>
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<div class="refsect1" lang="en">
<a name="id2569641"></a><h2>See Also</h2>
<a href="gst-plugins-base-libs-gstbaseaudiosrc.html#GstBaseAudioSrc"><span class="type">GstBaseAudioSrc</span></a>, <a href="gst-plugins-base-libs-gstringbuffer.html#GstRingBuffer"><span class="type">GstRingBuffer</span></a>, <a href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc"><span class="type">GstAudioSrc</span></a>.
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