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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>gstaudiodecoder</title>
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<a href="#gst-plugins-base-libs-gstaudiodecoder.synopsis" class="shortcut">Top</a>
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                  <a href="#gst-plugins-base-libs-gstaudiodecoder.description" class="shortcut">Description</a>
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                  <a href="#gst-plugins-base-libs-gstaudiodecoder.object-hierarchy" class="shortcut">Object Hierarchy</a>
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<a name="gst-plugins-base-libs-gstaudiodecoder"></a><div class="titlepage"></div>
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<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstaudiodecoder.top_of_page"></a>gstaudiodecoder</span></h2>
<p>gstaudiodecoder — Base class for audio decoders</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudiodecoder.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioDecoder"></a><pre class="synopsis">
#include &lt;gst/audio/gstaudiodecoder.h&gt;

struct              <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder-struct" title="struct GstAudioDecoder">GstAudioDecoder</a>;
struct              <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoderClass" title="struct GstAudioDecoderClass">GstAudioDecoderClass</a>;
#define             <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GST-AUDIO-DECODER-ERROR:CAPS" title="GST_AUDIO_DECODER_ERROR()">GST_AUDIO_DECODER_ERROR</a>             (el,
                                                         weight,
                                                         domain,
                                                         code,
                                                         text,
                                                         debug,
                                                         ret)
#define             <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GST-AUDIO-DECODER-SINK-NAME:CAPS" title="GST_AUDIO_DECODER_SINK_NAME">GST_AUDIO_DECODER_SINK_NAME</a>
#define             <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GST-AUDIO-DECODER-SINK-PAD:CAPS" title="GST_AUDIO_DECODER_SINK_PAD()">GST_AUDIO_DECODER_SINK_PAD</a>          (obj)
#define             <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GST-AUDIO-DECODER-SRC-NAME:CAPS" title="GST_AUDIO_DECODER_SRC_NAME">GST_AUDIO_DECODER_SRC_NAME</a>
#define             <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GST-AUDIO-DECODER-SRC-PAD:CAPS" title="GST_AUDIO_DECODER_SRC_PAD()">GST_AUDIO_DECODER_SRC_PAD</a>           (obj)
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-finish-frame" title="gst_audio_decoder_finish_frame ()">gst_audio_decoder_finish_frame</a>      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> frames</code></em>);
<a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="returnvalue">GstAudioInfo</span></a> *      <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-audio-info" title="gst_audio_decoder_get_audio_info ()">gst_audio_decoder_get_audio_info</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-byte-time" title="gst_audio_decoder_get_byte_time ()">gst_audio_decoder_get_byte_time</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-delay" title="gst_audio_decoder_get_delay ()">gst_audio_decoder_get_delay</a>         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-drainable" title="gst_audio_decoder_get_drainable ()">gst_audio_decoder_get_drainable</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-latency" title="gst_audio_decoder_get_latency ()">gst_audio_decoder_get_latency</a>       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</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> *min</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> *max</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-max-errors" title="gst_audio_decoder_get_max_errors ()">gst_audio_decoder_get_max_errors</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<span class="returnvalue">gint64</span>              <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-min-latency" title="gst_audio_decoder_get_min_latency ()">gst_audio_decoder_get_min_latency</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-needs-format" title="gst_audio_decoder_get_needs_format ()">gst_audio_decoder_get_needs_format</a>  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-parse-state" title="gst_audio_decoder_get_parse_state ()">gst_audio_decoder_get_parse_state</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *sync</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *eos</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-plc" title="gst_audio_decoder_get_plc ()">gst_audio_decoder_get_plc</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-plc-aware" title="gst_audio_decoder_get_plc_aware ()">gst_audio_decoder_get_plc_aware</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<span class="returnvalue">gint64</span>              <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-tolerance" title="gst_audio_decoder_get_tolerance ()">gst_audio_decoder_get_tolerance</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-byte-time" title="gst_audio_decoder_set_byte_time ()">gst_audio_decoder_set_byte_time</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-drainable" title="gst_audio_decoder_set_drainable ()">gst_audio_decoder_set_drainable</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-latency" title="gst_audio_decoder_set_latency ()">gst_audio_decoder_set_latency</a>       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</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> min</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> max</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-max-errors" title="gst_audio_decoder_set_max_errors ()">gst_audio_decoder_set_max_errors</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> num</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-min-latency" title="gst_audio_decoder_set_min_latency ()">gst_audio_decoder_set_min_latency</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><span class="type">gint64</span> num</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-needs-format" title="gst_audio_decoder_set_needs_format ()">gst_audio_decoder_set_needs_format</a>  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-plc" title="gst_audio_decoder_set_plc ()">gst_audio_decoder_set_plc</a>           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-plc-aware" title="gst_audio_decoder_set_plc_aware ()">gst_audio_decoder_set_plc_aware</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> plc</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-tolerance" title="gst_audio_decoder_set_tolerance ()">gst_audio_decoder_set_tolerance</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><span class="type">gint64</span> tolerance</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.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>
               +----GstAudioDecoder
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--min-latency" title='The "min-latency" property'>min-latency</a>"              <span class="type">gint64</span>                : Read / Write
  "<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--plc" title='The "plc" property'>plc</a>"                      <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write
  "<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--tolerance" title='The "tolerance" property'>tolerance</a>"                <span class="type">gint64</span>                : Read / Write
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.description"></a><h2>Description</h2>
<p>
This base class is for audio decoders turning encoded data into
raw audio samples.
</p>
<p>
GstAudioDecoder and subclass should cooperate as follows.
</p>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Configuration</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
    Initially, GstAudioDecoder calls <em class="parameter"><code>start</code></em> when the decoder element
    is activated, which allows subclass to perform any global setup.
    Base class (context) parameters can already be set according to subclass
    capabilities (or possibly upon receive more information in subsequent
    <em class="parameter"><code>set_format</code></em>).
  </p></li>
<li class="listitem"><p>
    GstAudioDecoder calls <em class="parameter"><code>set_format</code></em> to inform subclass of the format
    of input audio data that it is about to receive.
    While unlikely, it might be called more than once, if changing input
    parameters require reconfiguration.
  </p></li>
<li class="listitem"><p>
    GstAudioDecoder calls <em class="parameter"><code>stop</code></em> at end of all processing.
  </p></li>
</ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Data processing</b></p>
<ul class="itemizedlist" type="disc">
<li class="listitem"><p>
      Base class gathers input data, and optionally allows subclass
      to parse this into subsequently manageable (as defined by subclass)
      chunks.  Such chunks are subsequently referred to as 'frames',
      though they may or may not correspond to 1 (or more) audio format frame.
    </p></li>
<li class="listitem"><p>
      Input frame is provided to subclass' <em class="parameter"><code>handle_frame</code></em>.
    </p></li>
<li class="listitem"><p>
      If codec processing results in decoded data, subclass should call
      <em class="parameter"><code>gst_audio_decoder_finish_frame</code></em> to have decoded data pushed
      downstream.
    </p></li>
<li class="listitem"><p>
      Just prior to actually pushing a buffer downstream,
      it is passed to <em class="parameter"><code>pre_push</code></em>.  Subclass should either use this callback
      to arrange for additional downstream pushing or otherwise ensure such
      custom pushing occurs after at least a method call has finished since
      setting src pad caps.
    </p></li>
<li class="listitem"><p>
      During the parsing process GstAudioDecoderClass will handle both
      srcpad and sinkpad events. Sink events will be passed to subclass
      if <em class="parameter"><code>event</code></em> callback has been provided.
    </p></li>
</ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Shutdown phase</b></p>
<ul class="itemizedlist" type="disc"><li class="listitem"><p>
    GstAudioDecoder class calls <em class="parameter"><code>stop</code></em> to inform the subclass that data
    parsing will be stopped.
  </p></li></ul>
</div></li>
</ol></div>
<p>
</p>
<p>
Subclass is responsible for providing pad template caps for
source and sink pads. The pads need to be named "sink" and "src". It also
needs to set the fixed caps on srcpad, when the format is ensured.  This
is typically when base class calls subclass' <em class="parameter"><code>set_format</code></em> function, though
it might be delayed until calling <em class="parameter"><code>gst_audio_decoder_finish_frame</code></em>.
</p>
<p>
In summary, above process should have subclass concentrating on
codec data processing while leaving other matters to base class,
such as most notably timestamp handling.  While it may exert more control
in this area (see e.g. <em class="parameter"><code>pre_push</code></em>), it is very much not recommended.
</p>
<p>
In particular, base class will try to arrange for perfect output timestamps
as much as possible while tracking upstream timestamps.
To this end, if deviation between the next ideal expected perfect timestamp
and upstream exceeds <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--tolerance" title='The "tolerance" property'><span class="type">"tolerance"</span></a>, then resync to upstream
occurs (which would happen always if the tolerance mechanism is disabled).
</p>
<p>
In non-live pipelines, baseclass can also (configurably) arrange for
output buffer aggregation which may help to redue large(r) numbers of
small(er) buffers being pushed and processed downstream.
</p>
<p>
On the other hand, it should be noted that baseclass only provides limited
seeking support (upon explicit subclass request), as full-fledged support
should rather be left to upstream demuxer, parser or alike.  This simple
approach caters for seeking and duration reporting using estimated input
bitrates.
</p>
<p>
Things that subclass need to take care of:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>Provide pad templates</p></li>
<li class="listitem"><p>
     Set source pad caps when appropriate
  </p></li>
<li class="listitem"><p>
     Set user-configurable properties to sane defaults for format and
     implementing codec at hand, and convey some subclass capabilities and
     expectations in context.
  </p></li>
<li class="listitem"><p>
     Accept data in <em class="parameter"><code>handle_frame</code></em> and provide encoded results to
     <em class="parameter"><code>gst_audio_decoder_finish_frame</code></em>.  If it is prepared to perform
     PLC, it should also accept NULL data in <em class="parameter"><code>handle_frame</code></em> and provide for
     data for indicated duration.
  </p></li>
</ul></div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioDecoder-struct"></a><h3>struct GstAudioDecoder</h3>
<pre class="programlisting">struct GstAudioDecoder;</pre>
<p>
The opaque <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> data structure.
</p>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioDecoderClass"></a><h3>struct GstAudioDecoderClass</h3>
<pre class="programlisting">struct GstAudioDecoderClass {
  GstElementClass element_class;

  /* virtual methods for subclasses */

  gboolean      (*start)              (GstAudioDecoder *dec);

  gboolean      (*stop)               (GstAudioDecoder *dec);

  gboolean      (*set_format)         (GstAudioDecoder *dec,
                                       GstCaps *caps);

  GstFlowReturn (*parse)              (GstAudioDecoder *dec,
                                       GstAdapter *adapter,
                                       gint *offset, gint *length);

  GstFlowReturn (*handle_frame)       (GstAudioDecoder *dec,
                                       GstBuffer *buffer);

  void          (*flush)              (GstAudioDecoder *dec, gboolean hard);

  GstFlowReturn (*pre_push)           (GstAudioDecoder *dec,
                                       GstBuffer **buffer);

  gboolean      (*event)              (GstAudioDecoder *dec,
                                       GstEvent *event);
};
</pre>
<p>
Subclasses can override any of the available virtual methods or not, as
needed. At minimum <em class="parameter"><code>handle_frame</code></em> (and likely <em class="parameter"><code>set_format</code></em>) needs to be
overridden.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstElement.html#GstElementClass"><span class="type">GstElementClass</span></a> <em class="structfield"><code><a name="GstAudioDecoderClass.element-class"></a>element_class</code></em>;</span></p></td>
<td>The parent class structure</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.start"></a>start</code></em> ()</span></p></td>
<td>Optional.
Called when the element starts processing.
Allows opening external resources.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.stop"></a>stop</code></em> ()</span></p></td>
<td>Optional.
Called when the element stops processing.
Allows closing external resources.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.set-format"></a>set_format</code></em> ()</span></p></td>
<td>Notifies subclass of incoming data format (caps).</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.parse"></a>parse</code></em> ()</span></p></td>
<td>Optional.
Allows chopping incoming data into manageable units (frames)
for subsequent decoding.  This division is at subclass
discretion and may or may not correspond to 1 (or more)
frames as defined by audio format.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.handle-frame"></a>handle_frame</code></em> ()</span></p></td>
<td>Provides input data (or NULL to clear any remaining data)
to subclass.  Input data ref management is performed by
base class, subclass should not care or intervene,
and input data is only valid until next call to base class,
most notably a call to <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-finish-frame" title="gst_audio_decoder_finish_frame ()"><code class="function">gst_audio_decoder_finish_frame()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.flush"></a>flush</code></em> ()</span></p></td>
<td>Optional.
Instructs subclass to clear any codec caches and discard
any pending samples and not yet returned decoded data.
<em class="parameter"><code>hard</code></em> indicates whether a FLUSH is being processed,
or otherwise a DISCONT (or conceptually similar).</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.pre-push"></a>pre_push</code></em> ()</span></p></td>
<td>Optional.
Called just prior to pushing (encoded data) buffer downstream.
Subclass has full discretionary access to buffer,
and a not OK flow return will abort downstream pushing.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioDecoderClass.event"></a>event</code></em> ()</span></p></td>
<td>Optional.
Event handler on the sink pad. This function should return
TRUE if the event was handled and should be discarded
(i.e. not unref'ed).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-DECODER-ERROR:CAPS"></a><h3>GST_AUDIO_DECODER_ERROR()</h3>
<pre class="programlisting">#define             GST_AUDIO_DECODER_ERROR(el, weight, domain, code, text, debug, ret)</pre>
<p>
Utility function that audio decoder elements can use in case they encountered
a data processing error that may be fatal for the current "data unit" but
need not prevent subsequent decoding.  Such errors are counted and if there
are too many, as configured in the context's max_errors, the pipeline will
post an error message and the application will be requested to stop further
media processing.  Otherwise, it is considered a "glitch" and only a warning
is logged. In either case, <em class="parameter"><code>ret</code></em> is set to the proper value to
return to upstream/caller (indicating either GST_FLOW_ERROR or GST_FLOW_OK).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>el</code></em> :</span></p></td>
<td>the base audio decoder element that generates the error</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>weight</code></em> :</span></p></td>
<td>element defined weight of the error, added to error count</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>domain</code></em> :</span></p></td>
<td>like CORE, LIBRARY, RESOURCE or STREAM (see <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstGError.html"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>code</code></em> :</span></p></td>
<td>error code defined for that domain (see <a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstGError.html"><span class="type">gstreamer-GstGError</span></a>)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>text</code></em> :</span></p></td>
<td>the message to display (format string and args enclosed in
parentheses)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>debug</code></em> :</span></p></td>
<td>debugging information for the message (format string and args
enclosed in parentheses)</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ret</code></em> :</span></p></td>
<td>variable to receive return value</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-DECODER-SINK-NAME:CAPS"></a><h3>GST_AUDIO_DECODER_SINK_NAME</h3>
<pre class="programlisting">#define GST_AUDIO_DECODER_SINK_NAME    "sink"
</pre>
<p>
The name of the templates for the sink pad.
</p>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-DECODER-SINK-PAD:CAPS"></a><h3>GST_AUDIO_DECODER_SINK_PAD()</h3>
<pre class="programlisting">#define GST_AUDIO_DECODER_SINK_PAD(obj)        (((GstAudioDecoder *) (obj))-&gt;sinkpad)
</pre>
<p>
Gives the pointer to the sink <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> object of the element.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base audio codec instance</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-DECODER-SRC-NAME:CAPS"></a><h3>GST_AUDIO_DECODER_SRC_NAME</h3>
<pre class="programlisting">#define GST_AUDIO_DECODER_SRC_NAME     "src"
</pre>
<p>
The name of the templates for the source pad.
</p>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-DECODER-SRC-PAD:CAPS"></a><h3>GST_AUDIO_DECODER_SRC_PAD()</h3>
<pre class="programlisting">#define GST_AUDIO_DECODER_SRC_PAD(obj)         (((GstAudioDecoder *) (obj))-&gt;srcpad)
</pre>
<p>
Gives the pointer to the source <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html"><span class="type">GstPad</span></a> object of the element.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>obj</code></em> :</span></p></td>
<td>base audio codec instance</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-finish-frame"></a><h3>gst_audio_decoder_finish_frame ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_audio_decoder_finish_frame      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstBuffer.html#GstBuffer"><span class="type">GstBuffer</span></a> *buf</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> frames</code></em>);</pre>
<p>
Collects decoded data and pushes it downstream.
</p>
<p>
<em class="parameter"><code>buf</code></em> may be NULL in which case the indicated number of frames
are discarded and considered to have produced no output
(e.g. lead-in or setup frames).
Otherwise, source pad caps must be set when it is called with valid
data in <em class="parameter"><code>buf</code></em>.
</p>
<p>
Note that a frame received in <code class="function">gst_audio_decoder_handle_frame()</code> may be
invalidated by a call to this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buf</code></em> :</span></p></td>
<td>decoded data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>frames</code></em> :</span></p></td>
<td>number of decoded frames represented by decoded data</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> that should be escalated to caller (of caller)</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-audio-info"></a><h3>gst_audio_decoder_get_audio_info ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="returnvalue">GstAudioInfo</span></a> *      gst_audio_decoder_get_audio_info    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a> describing the input audio format</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-byte-time"></a><h3>gst_audio_decoder_get_byte_time ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                gst_audio_decoder_get_byte_time     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured byte to time conversion setting</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-delay"></a><h3>gst_audio_decoder_get_delay ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                gst_audio_decoder_get_delay         (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured decoder delay</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-drainable"></a><h3>gst_audio_decoder_get_drainable ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_audio_decoder_get_drainable     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<p>
Queries decoder drain handling.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if drainable handling is enabled.
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-latency"></a><h3>gst_audio_decoder_get_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_get_latency       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</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> *min</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> *max</code></em>);</pre>
<p>
Sets the variables pointed to by <em class="parameter"><code>min</code></em> and <em class="parameter"><code>max</code></em> to the currently configured
latency.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min</code></em> :</span></p></td>
<td>a pointer to storage to hold minimum latency. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
<td>a pointer to storage to hold maximum latency. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>][<acronym title="NULL is ok, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-max-errors"></a><h3>gst_audio_decoder_get_max_errors ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                gst_audio_decoder_get_max_errors    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured decoder tolerated error count.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-min-latency"></a><h3>gst_audio_decoder_get_min_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>              gst_audio_decoder_get_min_latency   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<p>
Queries decoder's latency aggregation.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>aggregation latency.
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-needs-format"></a><h3>gst_audio_decoder_get_needs_format ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_audio_decoder_get_needs_format  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<p>
Queries decoder required format handling.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if required format handling is enabled.
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-parse-state"></a><h3>gst_audio_decoder_get_parse_state ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_get_parse_state   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *sync</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> *eos</code></em>);</pre>
<p>
Return current parsing (sync and eos) state.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>sync</code></em> :</span></p></td>
<td>a pointer to a variable to hold the current sync state</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>eos</code></em> :</span></p></td>
<td>a pointer to a variable to hold the current eos state</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-plc"></a><h3>gst_audio_decoder_get_plc ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_audio_decoder_get_plc           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<p>
Queries decoder packet loss concealment handling.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if packet loss concealment is enabled.
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-plc-aware"></a><h3>gst_audio_decoder_get_plc_aware ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>                gst_audio_decoder_get_plc_aware     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured plc handling</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-tolerance"></a><h3>gst_audio_decoder_get_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>              gst_audio_decoder_get_tolerance     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>);</pre>
<p>
Queries current audio jitter tolerance threshold.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>decoder audio jitter tolerance threshold.
MT safe.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-byte-time"></a><h3>gst_audio_decoder_set_byte_time ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_byte_time     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
<p>
Allows baseclass to perform byte to time estimated conversion.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enabled</code></em> :</span></p></td>
<td>whether to enable byte to time conversion</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-drainable"></a><h3>gst_audio_decoder_set_drainable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_drainable     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
<p>
Configures decoder drain handling.  If drainable, subclass might
be handed a NULL buffer to have it return any leftover decoded data.
Otherwise, it is not considered so capable and will only ever be passed
real data.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enabled</code></em> :</span></p></td>
<td>new state</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-latency"></a><h3>gst_audio_decoder_set_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_latency       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</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> min</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> max</code></em>);</pre>
<p>
Sets decoder latency.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min</code></em> :</span></p></td>
<td>minimum latency</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max</code></em> :</span></p></td>
<td>maximum latency</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-max-errors"></a><h3>gst_audio_decoder_set_max_errors ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_max_errors    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="type">gint</span></a> num</code></em>);</pre>
<p>
Sets numbers of tolerated decoder errors, where a tolerated one is then only
warned about, but more than tolerated will lead to fatal error.  Default
is set to GST_AUDIO_DECODER_MAX_ERRORS.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>max tolerated errors</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-min-latency"></a><h3>gst_audio_decoder_set_min_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_min_latency   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><span class="type">gint64</span> num</code></em>);</pre>
<p>
Sets decoder minimum aggregation latency.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>new minimum latency</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-needs-format"></a><h3>gst_audio_decoder_set_needs_format ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_needs_format  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
<p>
Configures decoder format needs.  If enabled, subclass needs to be
negotiated with format caps before it can process any data.  It will then
never be handed any data before it has been configured.
Otherwise, it might be handed data without having been configured and
is then expected being able to do so either by default
or based on the input data.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enabled</code></em> :</span></p></td>
<td>new state</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-plc"></a><h3>gst_audio_decoder_set_plc ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_plc           (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> enabled</code></em>);</pre>
<p>
Enable or disable decoder packet loss concealment, provided subclass
and codec are capable and allow handling plc.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enabled</code></em> :</span></p></td>
<td>new state</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-plc-aware"></a><h3>gst_audio_decoder_set_plc_aware ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_plc_aware     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> plc</code></em>);</pre>
<p>
Indicates whether or not subclass handles packet loss concealment (plc).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>plc</code></em> :</span></p></td>
<td>new plc state</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-tolerance"></a><h3>gst_audio_decoder_set_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_decoder_set_tolerance     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *dec</code></em>,
                                                         <em class="parameter"><code><span class="type">gint64</span> tolerance</code></em>);</pre>
<p>
Configures decoder audio jitter tolerance threshold.
</p>
<p>
MT safe.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>dec</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tolerance</code></em> :</span></p></td>
<td>new tolerance</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioDecoder--min-latency"></a><h3>The <code class="literal">"min-latency"</code> property</h3>
<pre class="programlisting">  "min-latency"              <span class="type">gint64</span>                : Read / Write</pre>
<p>Aggregate output data to a minimum of latency time (ns).</p>
<p>Allowed values: &gt;= 0</p>
<p>Default value: 0</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioDecoder--plc"></a><h3>The <code class="literal">"plc"</code> property</h3>
<pre class="programlisting">  "plc"                      <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
<p>Perform packet loss concealment (if supported).</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioDecoder--tolerance"></a><h3>The <code class="literal">"tolerance"</code> property</h3>
<pre class="programlisting">  "tolerance"                <span class="type">gint64</span>                : Read / Write</pre>
<p>Perfect ts while timestamp jitter/imperfection within tolerance (ns).</p>
<p>Allowed values: &gt;= 0</p>
<p>Default value: 0</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.see-also"></a><h2>See Also</h2>
<a href="/usr/share/gtk-doc/html/gstreamer-libs-0.10/GstBaseTransform.html"><span class="type">GstBaseTransform</span></a>
</div>
</div>
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