gstreamer1.0-plugins-base-doc 1.8.0-1ubuntu1 / usr / share / gtk-doc / html / gst-plugins-base-libs-1.0 / gst-plugins-base-libs-gstaudiodecoder.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
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<title>gstaudiodecoder: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
<link rel="up" href="gstreamer-audio.html" title="Audio Library">
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<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstaudiodecoder.description" class="shortcut">Description</a></span><span id="nav_hierarchy">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstaudiodecoder.object-hierarchy" class="shortcut">Object Hierarchy</a></span><span id="nav_properties">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-gstaudiodecoder.properties" class="shortcut">Properties</a></span>
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<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
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<div class="refentry">
<a name="gst-plugins-base-libs-gstaudiodecoder"></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-gstaudiodecoder.top_of_page"></a>gstaudiodecoder</span></h2>
<p>gstaudiodecoder — Base class for audio decoders</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<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><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<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><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<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><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-output-format" title="gst_audio_decoder_set_output_format ()">gst_audio_decoder_set_output_format</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-negotiate" title="gst_audio_decoder_negotiate ()">gst_audio_decoder_negotiate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBuffer.html"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-allocate-output-buffer" title="gst_audio_decoder_allocate_output_buffer ()">gst_audio_decoder_allocate_output_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-allocator" title="gst_audio_decoder_get_allocator ()">gst_audio_decoder_get_allocator</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="returnvalue">GstAudioInfo</span></a> *
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-get-estimate-rate" title="gst_audio_decoder_get_estimate_rate ()">gst_audio_decoder_get_estimate_rate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-set-estimate-rate" title="gst_audio_decoder_set_estimate_rate ()">gst_audio_decoder_set_estimate_rate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<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> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-merge-tags" title="gst_audio_decoder_merge_tags ()">gst_audio_decoder_merge_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-proxy-getcaps" title="gst_audio_decoder_proxy_getcaps ()">gst_audio_decoder_proxy_getcaps</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.properties"></a><h2>Properties</h2>
<div class="informaltable"><table class="informaltable" border="0">
<colgroup>
<col width="150px" class="properties_type">
<col width="300px" class="properties_name">
<col width="200px" class="properties_flags">
</colgroup>
<tbody>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--min-latency" title="The “min-latency” property">min-latency</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--plc" title="The “plc” property">plc</a></td>
<td class="property_flags">Read / Write</td>
</tr>
<tr>
<td class="property_type"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></td>
<td class="property_name"><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder--tolerance" title="The “tolerance” property">tolerance</a></td>
<td class="property_flags">Read / Write</td>
</tr>
</tbody>
</table></div>
</div>
<a name="GstAudioDecoder"></a><div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder-struct" title="struct GstAudioDecoder">GstAudioDecoder</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoderClass" title="struct GstAudioDecoderClass">GstAudioDecoderClass</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><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></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><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></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstObject.html">GstObject</a>
            <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html">GstElement</a>
                <span class="lineart">╰──</span> GstAudioDecoder
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/audio/gstaudiodecoder.h&gt;
</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" style="list-style-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" style="list-style-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" style="list-style-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>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" style="list-style-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>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.functions_details"></a><h2>Functions</h2>
<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="refsect3">
<a name="id-1.2.6.7.10.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>el</p></td>
<td class="parameter_description"><p>the base audio decoder element that generates the error</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>weight</p></td>
<td class="parameter_description"><p>element defined weight of the error, added to error count</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>domain</p></td>
<td class="parameter_description"><p>like CORE, LIBRARY, RESOURCE or STREAM (see <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstGError.html"><span class="type">gstreamer-GstGError</span></a>)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>code</p></td>
<td class="parameter_description"><p>error code defined for that domain (see <a href="/usr/share/gtk-doc/html/gstreamer-1.0/gstreamer-GstGError.html"><span class="type">gstreamer-GstGError</span></a>)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>text</p></td>
<td class="parameter_description"><p>the message to display (format string and args enclosed in
parentheses)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>debug</p></td>
<td class="parameter_description"><p>debugging information for the message (format string and args
enclosed in parentheses)</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>ret</p></td>
<td class="parameter_description"><p>variable to receive return value</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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-1.0/GstPad.html"><span class="type">GstPad</span></a> object of the element.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>obj</p></td>
<td class="parameter_description"><p>base audio codec instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</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-1.0/GstPad.html"><span class="type">GstPad</span></a> object of the element.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>obj</p></td>
<td class="parameter_description"><p>base audio codec instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</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-1.0/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-1.0/GstBuffer.html"><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="refsect3">
<a name="id-1.2.6.7.10.5.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>buf</p></td>
<td class="parameter_description"><p>decoded data</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frames</p></td>
<td class="parameter_description"><p>number of decoded frames represented by decoded data</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.5.8"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> that should be escalated to caller (of caller)</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-output-format"></a><h3>gst_audio_decoder_set_output_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_set_output_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>const <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a> *info</code></em>);</pre>
<p>Configure output info on the srcpad of <em class="parameter"><code>dec</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>info</p></td>
<td class="parameter_description"><p><a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.6.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> on success.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-negotiate"></a><h3>gst_audio_decoder_negotiate ()</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_negotiate (<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>Negotiate with downstream elements to currently configured <a class="link" href="gst-plugins-base-libs-gstaudio.html#GstAudioInfo" title="struct GstAudioInfo"><span class="type">GstAudioInfo</span></a>.
Unmark GST_PAD_FLAG_NEED_RECONFIGURE in any case. But mark it again if
negotiate fails.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.7.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> if the negotiation succeeded, else <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-allocate-output-buffer"></a><h3>gst_audio_decoder_allocate_output_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstBuffer.html"><span class="returnvalue">GstBuffer</span></a> *
gst_audio_decoder_allocate_output_buffer
                               (<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#gsize"><span class="type">gsize</span></a> size</code></em>);</pre>
<p>Helper function that allocates a buffer to hold an audio frame
for <em class="parameter"><code>dec</code></em>
's current output format.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>size</p></td>
<td class="parameter_description"><p>size of the buffer</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.8.6"></a><h4>Returns</h4>
<p> allocated buffer. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-allocator"></a><h3>gst_audio_decoder_get_allocator ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_audio_decoder_get_allocator (<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-1.0/GstAllocator.html"><span class="type">GstAllocator</span></a> **allocator</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstAllocator.html#GstAllocationParams"><span class="type">GstAllocationParams</span></a> *params</code></em>);</pre>
<p>Lets <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> sub-classes to know the memory <em class="parameter"><code>allocator</code></em>

used by the base class and its <em class="parameter"><code>params</code></em>
.</p>
<p>Unref the <em class="parameter"><code>allocator</code></em>
 after use it.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.9.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>allocator</p></td>
<td class="parameter_description"><p> the <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstAllocator.html"><span class="type">GstAllocator</span></a>
used. </p></td>
<td class="parameter_annotations"><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>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>params</p></td>
<td class="parameter_description"><p> the
<span class="type">GstAllocatorParams</span> of <em class="parameter"><code>allocator</code></em>
. </p></td>
<td class="parameter_annotations"><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>][<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.10.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.10.5"></a><h4>Returns</h4>
<p> 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</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-estimate-rate"></a><h3>gst_audio_decoder_get_estimate_rate ()</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_estimate_rate (<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="refsect3">
<a name="id-1.2.6.7.10.11.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.11.5"></a><h4>Returns</h4>
<p> currently configured byte to time conversion setting</p>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.12.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.12.5"></a><h4>Returns</h4>
<p> currently configured decoder delay</p>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.13.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.13.6"></a><h4>Returns</h4>
<p> TRUE if drainable handling is enabled.</p>
<p>MT safe.</p>
</div>
</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-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *min</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/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="refsect3">
<a name="id-1.2.6.7.10.14.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min</p></td>
<td class="parameter_description"><p> a pointer to storage to hold minimum latency. </p></td>
<td class="parameter_annotations"><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 class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p> a pointer to storage to hold maximum latency. </p></td>
<td class="parameter_annotations"><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>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.15.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.15.5"></a><h4>Returns</h4>
<p> currently configured decoder tolerated error count.</p>
</div>
</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"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
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="refsect3">
<a name="id-1.2.6.7.10.16.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.16.6"></a><h4>Returns</h4>
<p> aggregation latency.</p>
<p>MT safe.</p>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.17.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.17.6"></a><h4>Returns</h4>
<p> TRUE if required format handling is enabled.</p>
<p>MT safe.</p>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.18.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>sync</p></td>
<td class="parameter_description"><p>a pointer to a variable to hold the current sync state</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>eos</p></td>
<td class="parameter_description"><p>a pointer to a variable to hold the current eos state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.19.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.19.6"></a><h4>Returns</h4>
<p> TRUE if packet loss concealment is enabled.</p>
<p>MT safe.</p>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.20.4"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.20.5"></a><h4>Returns</h4>
<p> currently configured plc handling</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-get-tolerance"></a><h3>gst_audio_decoder_get_tolerance ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="returnvalue">GstClockTime</span></a>
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="refsect3">
<a name="id-1.2.6.7.10.21.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.21.6"></a><h4>Returns</h4>
<p> decoder audio jitter tolerance threshold.</p>
<p>MT safe.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-set-estimate-rate"></a><h3>gst_audio_decoder_set_estimate_rate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_audio_decoder_set_estimate_rate (<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="refsect3">
<a name="id-1.2.6.7.10.22.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enabled</p></td>
<td class="parameter_description"><p>whether to enable byte to time conversion</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.23.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enabled</p></td>
<td class="parameter_description"><p>new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> min</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> max</code></em>);</pre>
<p>Sets decoder latency.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.24.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min</p></td>
<td class="parameter_description"><p>minimum latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>maximum latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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. You can set
-1 for never returning fatal errors. Default is set to
GST_AUDIO_DECODER_MAX_ERRORS.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.25.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>num</p></td>
<td class="parameter_description"><p>max tolerated errors</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> num</code></em>);</pre>
<p>Sets decoder minimum aggregation latency.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.26.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>num</p></td>
<td class="parameter_description"><p>new minimum latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.27.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enabled</p></td>
<td class="parameter_description"><p>new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.28.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enabled</p></td>
<td class="parameter_description"><p>new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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="refsect3">
<a name="id-1.2.6.7.10.29.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>plc</p></td>
<td class="parameter_description"><p>new plc state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> tolerance</code></em>);</pre>
<p>Configures decoder audio jitter tolerance threshold.</p>
<p>MT safe.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.30.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tolerance</p></td>
<td class="parameter_description"><p>new tolerance</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-merge-tags"></a><h3>gst_audio_decoder_merge_tags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_audio_decoder_merge_tags (<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>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagList.html"><span class="type">GstTagList</span></a> *tags</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagList.html#GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> mode</code></em>);</pre>
<p>Sets the audio decoder tags and how they should be merged with any
upstream stream tags. This will override any tags previously-set
with <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#gst-audio-decoder-merge-tags" title="gst_audio_decoder_merge_tags ()"><code class="function">gst_audio_decoder_merge_tags()</code></a>.</p>
<p>Note that this is provided for convenience, and the subclass is
not required to use this and can still do tag handling on its own.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.31.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>dec</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>tags</p></td>
<td class="parameter_description"><p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagList.html"><span class="type">GstTagList</span></a> to merge, or NULL. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>mode</p></td>
<td class="parameter_description"><p>the <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagList.html#GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> to use, usually <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstTagList.html#GST-TAG-MERGE-REPLACE:CAPS"><span class="type">GST_TAG_MERGE_REPLACE</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-decoder-proxy-getcaps"></a><h3>gst_audio_decoder_proxy_getcaps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a> *
gst_audio_decoder_proxy_getcaps (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a> *decoder</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> *caps</code></em>,
                                 <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> *filter</code></em>);</pre>
<p>Returns caps that express <em class="parameter"><code>caps</code></em>
 (or sink template caps if <em class="parameter"><code>caps</code></em>
 == NULL)
restricted to rate/channels/... combinations supported by downstream
elements.</p>
<div class="refsect3">
<a name="id-1.2.6.7.10.32.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>decoder</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstaudiodecoder.html#GstAudioDecoder"><span class="type">GstAudioDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p> initial caps. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>filter</p></td>
<td class="parameter_description"><p> filter caps. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.6.7.10.32.6"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> owned by caller. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: 1.6</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudiodecoder.other_details"></a><h2>Types and Values</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>
</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      (*sink_event)         (GstAudioDecoder *dec,
                                       GstEvent *event);
  gboolean      (*src_event)          (GstAudioDecoder *dec,
                                       GstEvent *event);

  gboolean      (*open)               (GstAudioDecoder *dec);

  gboolean      (*close)              (GstAudioDecoder *dec);

  gboolean      (*negotiate)          (GstAudioDecoder *dec);

  gboolean      (*decide_allocation)  (GstAudioDecoder *dec, GstQuery *query);

  gboolean      (*propose_allocation) (GstAudioDecoder *dec,
                                       GstQuery * query);

  gboolean      (*sink_query)         (GstAudioDecoder *dec, GstQuery *query);

  gboolean      (*src_query)          (GstAudioDecoder *dec, GstQuery *query);

  GstCaps *     (*getcaps)            (GstAudioDecoder * dec,
                                       GstCaps * filter);

  gboolean      (*transform_meta)     (GstAudioDecoder *enc, GstBuffer *outbuf,
                                       GstMeta *meta, GstBuffer *inbuf);
};
</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="refsect3">
<a name="id-1.2.6.7.11.3.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstElement.html#GstElementClass"><span class="type">GstElementClass</span></a> <em class="structfield"><code><a name="GstAudioDecoderClass.element-class"></a>element_class</code></em>;</p></td>
<td class="struct_member_description"><p>The parent class structure</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.start"></a>start</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called when the element starts processing.
Allows opening external resources.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.stop"></a>stop</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called when the element stops processing.
Allows closing external resources.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.set-format"></a>set_format</code></em> ()</p></td>
<td class="struct_member_description"><p>Notifies subclass of incoming data format (caps).</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.parse"></a>parse</code></em> ()</p></td>
<td class="struct_member_description"><p>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.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.handle-frame"></a>handle_frame</code></em> ()</p></td>
<td class="struct_member_description"><p>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>.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.flush"></a>flush</code></em> ()</p></td>
<td class="struct_member_description"><p>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).</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.pre-push"></a>pre_push</code></em> ()</p></td>
<td class="struct_member_description"><p>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.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.sink-event"></a>sink_event</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Event handler on the sink pad. Subclasses should chain up to
the parent implementation to invoke the default handler.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.src-event"></a>src_event</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Event handler on the src pad. Subclasses should chain up to
the parent implementation to invoke the default handler.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.open"></a>open</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called when the element changes to GST_STATE_READY.
Allows opening external resources.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.close"></a>close</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called when the element changes to GST_STATE_NULL.
Allows closing external resources.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.negotiate"></a>negotiate</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Negotiate with downstream and configure buffer pools, etc.
Subclasses should chain up to the parent implementation to
invoke the default handler.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.decide-allocation"></a>decide_allocation</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Setup the allocation parameters for allocating output
buffers. The passed in query contains the result of the
downstream allocation query.
Subclasses should chain up to the parent implementation to
invoke the default handler.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.propose-allocation"></a>propose_allocation</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Propose buffer allocation parameters for upstream elements.
Subclasses should chain up to the parent implementation to
invoke the default handler.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.sink-query"></a>sink_query</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Query handler on the sink pad. This function should
return TRUE if the query could be performed. Subclasses
should chain up to the parent implementation to invoke the
default handler. Since 1.6</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.src-query"></a>src_query</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Query handler on the source pad. This function should
return TRUE if the query could be performed. Subclasses
should chain up to the parent implementation to invoke the
default handler. Since 1.6</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.getcaps"></a>getcaps</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Allows for a custom sink getcaps implementation.
If not implemented,
default returns gst_audio_decoder_proxy_getcaps
applied to sink template caps.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAudioDecoderClass.transform-meta"></a>transform_meta</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional. Transform the metadata on the input buffer to the
output buffer. By default this method copies all meta without
tags and meta with only the "audio" tag. subclasses can
implement this method and return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the metadata is to be
copied. Since 1.6</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</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>
</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>
</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”              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>Aggregate output data to a minimum of latency time (ns).</p>
<p>Flags: Read / Write</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></pre>
<p>Perform packet loss concealment (if supported).</p>
<p>Flags: Read / Write</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”                <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint64"><span class="type">gint64</span></a></pre>
<p>Perfect ts while timestamp jitter/imperfection within tolerance (ns).</p>
<p>Flags: Read / Write</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>
<p><a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseTransform.html"><span class="type">GstBaseTransform</span></a></p>
</div>
</div>
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