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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<th width="100%" align="center">GStreamer Base Plugins 1.0 Library Reference Manual</th>
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<a href="#gst-plugins-base-libs-gstaudiosrc.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#gst-plugins-base-libs-gstaudiosrc.description" class="shortcut">Description</a>
                   | 
                  <a href="#gst-plugins-base-libs-gstaudiosrc.object-hierarchy" class="shortcut">Object Hierarchy</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstaudiosrc"></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-gstaudiosrc.top_of_page"></a>gstaudiosrc</span></h2>
<p>gstaudiosrc — Simple base class for audio sources</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudiosrc.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioSrc"></a><pre class="synopsis">
#include &lt;gst/audio/gstaudiosrc.h&gt;

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/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
         +----<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
               +----<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
                     +----<a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSrc.html">GstBaseSrc</a>
                           +----<a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstPushSrc.html">GstPushSrc</a>
                                 +----<a class="link" href="gst-plugins-base-libs-gstaudiobasesrc.html#GstAudioBaseSrc">GstAudioBaseSrc</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" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<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-gstaudiobasesrc.html#GstAudioBaseSrc"><span class="type">GstAudioBaseSrc</span></a> using a default implementation of a
<a class="link" href="gst-plugins-base-libs-gstaudioringbuffer.html#GstAudioRingBuffer"><span class="type">GstAudioRingBuffer</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 {
  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 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" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><a class="link" href="gst-plugins-base-libs-gstaudiobasesrc.html#GstAudioBaseSrcClass" title="struct GstAudioBaseSrcClass"><span class="type">GstAudioBaseSrcClass</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-gstaudiobasesrc.html#GstAudioBaseSrc"><span class="type">GstAudioBaseSrc</span></a>, <a class="link" href="gst-plugins-base-libs-gstaudioringbuffer.html#GstAudioRingBuffer"><span class="type">GstAudioRingBuffer</span></a>, <a class="link" href="gst-plugins-base-libs-gstaudiosrc.html#GstAudioSrc"><span class="type">GstAudioSrc</span></a>.
</div>
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