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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#gst-plugins-base-libs-gstaudioclock.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#gst-plugins-base-libs-gstaudioclock.description" class="shortcut">Description</a>
                   | 
                  <a href="#gst-plugins-base-libs-gstaudioclock.object-hierarchy" class="shortcut">Object Hierarchy</a>
</td></tr>
</table>
<div class="refentry">
<a name="gst-plugins-base-libs-gstaudioclock"></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-gstaudioclock.top_of_page"></a>gstaudioclock</span></h2>
<p>gstaudioclock — Helper object for implementing audio clocks</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudioclock.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioClock"></a><pre class="synopsis">
#include &lt;gst/audio/gstaudioclock.h&gt;

struct              <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock-struct" title="struct GstAudioClock">GstAudioClock</a>;
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        (<a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()">*GstAudioClockGetTimeFunc</a>)         (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="returnvalue">GstClock</span></a> *          <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-new" title="gst_audio_clock_new ()">gst_audio_clock_new</a>                 (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> func</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="returnvalue">GstClock</span></a> *          <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-new-full" title="gst_audio_clock_new_full ()">gst_audio_clock_new_full</a>            (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> func</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_notify</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-adjust" title="gst_audio_clock_adjust ()">gst_audio_clock_adjust</a>              (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-get-time" title="gst_audio_clock_get_time ()">gst_audio_clock_get_time</a>            (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-reset" title="gst_audio_clock_reset ()">gst_audio_clock_reset</a>               (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#gst-audio-clock-invalidate" title="gst_audio_clock_invalidate ()">gst_audio_clock_invalidate</a>          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioclock.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/GstClock.html">GstClock</a>
               +----<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstSystemClock.html">GstSystemClock</a>
                     +----GstAudioClock
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioclock.description"></a><h2>Description</h2>
<p>
<a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> makes it easy for elements to implement a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a>, they
simply need to provide a function that returns the current clock time.
</p>
<p>
This object is internally used to implement the clock in <a class="link" href="gst-plugins-base-libs-gstbaseaudiosink.html#GstBaseAudioSink"><span class="type">GstBaseAudioSink</span></a>.
</p>
<p>
Last reviewed on 2006-09-27 (0.10.12)
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioclock.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioClock-struct"></a><h3>struct GstAudioClock</h3>
<pre class="programlisting">struct GstAudioClock;</pre>
<p>
Opaque <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>.
</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioClockGetTimeFunc"></a><h3>GstAudioClockGetTimeFunc ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        (*GstAudioClockGetTimeFunc)         (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
This function will be called whenever the current clock time needs to be
calculated. If this function returns <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a>, the last reported
time will be returned by the clock.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>the <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current time or <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a> if the previous time should
be used.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-new"></a><h3>gst_audio_clock_new ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="returnvalue">GstClock</span></a> *          gst_audio_clock_new                 (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> func</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>
Create a new <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> instance. Whenever the clock time should be
calculated it will call <em class="parameter"><code>func</code></em> with <em class="parameter"><code>user_data</code></em>. When <em class="parameter"><code>func</code></em> returns
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a>, the clock will return the last reported time.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the clock</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>a function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> casted to a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a>.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-new-full"></a><h3>gst_audio_clock_new_full ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="returnvalue">GstClock</span></a> *          gst_audio_clock_new_full            (<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>,
                                                         <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> func</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> destroy_notify</code></em>);</pre>
<p>
Create a new <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> instance. Whenever the clock time should be
calculated it will call <em class="parameter"><code>func</code></em> with <em class="parameter"><code>user_data</code></em>. When <em class="parameter"><code>func</code></em> returns
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GST-CLOCK-TIME-NONE:CAPS"><span class="type">GST_CLOCK_TIME_NONE</span></a>, the clock will return the last reported time.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>name</code></em> :</span></p></td>
<td>the name of the clock</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>func</code></em> :</span></p></td>
<td>a function</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>user data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>destroy_notify</code></em> :</span></p></td>
<td>
<a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> for <em class="parameter"><code>user_data</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a new <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> casted to a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.31</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-adjust"></a><h3>gst_audio_clock_adjust ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        gst_audio_clock_adjust              (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Adjust <em class="parameter"><code>time</code></em> with the internal offset of the audio clock.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<em class="parameter"><code>time</code></em> adjusted with the internal offset.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.23</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-get-time"></a><h3>gst_audio_clock_get_time ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>        gst_audio_clock_get_time            (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Report the time as returned by the <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> without applying
any offsets.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the time as reported by the time function of the audio clock</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.23</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-reset"></a><h3>gst_audio_clock_reset ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_clock_reset               (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a> *clock</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> time</code></em>);</pre>
<p>
Inform <em class="parameter"><code>clock</code></em> that future calls to <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> will return values
starting from <em class="parameter"><code>time</code></em>. The clock will update an internal offset to make sure that
future calls to internal_time will return an increasing result as required by
the <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>time</code></em> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-clock-invalidate"></a><h3>gst_audio_clock_invalidate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_clock_invalidate          (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstClock.html"><span class="type">GstClock</span></a> *clock</code></em>);</pre>
<p>
Invalidate the clock function. Call this function when the provided
<a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClockGetTimeFunc" title="GstAudioClockGetTimeFunc ()"><span class="type">GstAudioClockGetTimeFunc</span></a> cannot be called anymore, for example, when the
user_data becomes invalid.
</p>
<p>
After calling this function, <em class="parameter"><code>clock</code></em> will return the last returned time for
the rest of its lifetime.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>clock</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioclock.html#GstAudioClock"><span class="type">GstAudioClock</span></a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.31</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioclock.see-also"></a><h2>See Also</h2>
<a class="link" href="gst-plugins-base-libs-gstbaseaudiosink.html#GstBaseAudioSink"><span class="type">GstBaseAudioSink</span></a>, <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstSystemClock.html"><span class="type">GstSystemClock</span></a>
</div>
</div>
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