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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-gstaudioencoder.top_of_page"></a>gstaudioencoder</span></h2>
<p>gstaudioencoder — Base class for audio encoders</p>
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<div class="refsynopsisdiv">
<a name="gst-plugins-base-libs-gstaudioencoder.synopsis"></a><h2>Synopsis</h2>
<a name="GstAudioEncoder"></a><pre class="synopsis">
#include &lt;gst/audio/gstaudioencoder.h&gt;

struct              <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder-struct" title="struct GstAudioEncoder">GstAudioEncoder</a>;
struct              <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoderClass" title="struct GstAudioEncoderClass">GstAudioEncoderClass</a>;
#define             <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GST-AUDIO-ENCODER-SEGMENT:CAPS" title="GST_AUDIO_ENCODER_SEGMENT()">GST_AUDIO_ENCODER_SEGMENT</a>           (obj)
#define             <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GST-AUDIO-ENCODER-SINK-NAME:CAPS" title="GST_AUDIO_ENCODER_SINK_NAME">GST_AUDIO_ENCODER_SINK_NAME</a>
#define             <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GST-AUDIO-ENCODER-SINK-PAD:CAPS" title="GST_AUDIO_ENCODER_SINK_PAD()">GST_AUDIO_ENCODER_SINK_PAD</a>          (obj)
#define             <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GST-AUDIO-ENCODER-SRC-NAME:CAPS" title="GST_AUDIO_ENCODER_SRC_NAME">GST_AUDIO_ENCODER_SRC_NAME</a>
#define             <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GST-AUDIO-ENCODER-SRC-PAD:CAPS" title="GST_AUDIO_ENCODER_SRC_PAD()">GST_AUDIO_ENCODER_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-gstaudioencoder.html#gst-audio-encoder-finish-frame" title="gst_audio_encoder_finish_frame ()">gst_audio_encoder_finish_frame</a>      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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> *buffer</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> samples</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-gstaudioencoder.html#gst-audio-encoder-get-audio-info" title="gst_audio_encoder_get_audio_info ()">gst_audio_encoder_get_audio_info</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-drainable" title="gst_audio_encoder_get_drainable ()">gst_audio_encoder_get_drainable</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-frame-max" title="gst_audio_encoder_get_frame_max ()">gst_audio_encoder_get_frame_max</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-frame-samples-min" title="gst_audio_encoder_get_frame_samples_min ()">gst_audio_encoder_get_frame_samples_min</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-frame-samples-max" title="gst_audio_encoder_get_frame_samples_max ()">gst_audio_encoder_get_frame_samples_max</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-hard-min" title="gst_audio_encoder_get_hard_min ()">gst_audio_encoder_get_hard_min</a>      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-hard-resync" title="gst_audio_encoder_get_hard_resync ()">gst_audio_encoder_get_hard_resync</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-get-latency" title="gst_audio_encoder_get_latency ()">gst_audio_encoder_get_latency</a>       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-lookahead" title="gst_audio_encoder_get_lookahead ()">gst_audio_encoder_get_lookahead</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-mark-granule" title="gst_audio_encoder_get_mark_granule ()">gst_audio_encoder_get_mark_granule</a>  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-get-perfect-timestamp" title="gst_audio_encoder_get_perfect_timestamp ()">gst_audio_encoder_get_perfect_timestamp</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);
<span class="returnvalue">gint64</span>              <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-get-tolerance" title="gst_audio_encoder_get_tolerance ()">gst_audio_encoder_get_tolerance</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);
<a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> *           <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-proxy-getcaps" title="gst_audio_encoder_proxy_getcaps ()">gst_audio_encoder_proxy_getcaps</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);
<span class="returnvalue">void</span>                <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-set-drainable" title="gst_audio_encoder_set_drainable ()">gst_audio_encoder_set_drainable</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-frame-max" title="gst_audio_encoder_set_frame_max ()">gst_audio_encoder_set_frame_max</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-frame-samples-min" title="gst_audio_encoder_set_frame_samples_min ()">gst_audio_encoder_set_frame_samples_min</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-frame-samples-max" title="gst_audio_encoder_set_frame_samples_max ()">gst_audio_encoder_set_frame_samples_max</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-hard-min" title="gst_audio_encoder_set_hard_min ()">gst_audio_encoder_set_hard_min</a>      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-hard-resync" title="gst_audio_encoder_set_hard_resync ()">gst_audio_encoder_set_hard_resync</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-latency" title="gst_audio_encoder_set_latency ()">gst_audio_encoder_set_latency</a>       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-lookahead" title="gst_audio_encoder_set_lookahead ()">gst_audio_encoder_set_lookahead</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-mark-granule" title="gst_audio_encoder_set_mark_granule ()">gst_audio_encoder_set_mark_granule</a>  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-perfect-timestamp" title="gst_audio_encoder_set_perfect_timestamp ()">gst_audio_encoder_set_perfect_timestamp</a>
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.html#gst-audio-encoder-set-tolerance" title="gst_audio_encoder_set_tolerance ()">gst_audio_encoder_set_tolerance</a>     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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-gstaudioencoder.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>
               +----GstAudioEncoder
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioencoder.implemented-interfaces"></a><h2>Implemented Interfaces</h2>
<p>
GstAudioEncoder implements
 <a href="/usr/share/gtk-doc/html/gstreamer-0.10/GstPreset.html">GstPreset</a>.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioencoder.properties"></a><h2>Properties</h2>
<pre class="synopsis">
  "<a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder--hard-resync" title='The "hard-resync" property'>hard-resync</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-gstaudioencoder.html#GstAudioEncoder--mark-granule" title='The "mark-granule" property'>mark-granule</a>"             <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read
  "<a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder--perfect-timestamp" title='The "perfect-timestamp" property'>perfect-timestamp</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-gstaudioencoder.html#GstAudioEncoder--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-gstaudioencoder.description"></a><h2>Description</h2>
<p>
This base class is for audio encoders turning raw audio samples into
encoded audio data.
</p>
<p>
GstAudioEncoder 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, GstAudioEncoder calls <em class="parameter"><code>start</code></em> when the encoder element
    is activated, which allows subclass to perform any global setup.
  </p></li>
<li class="listitem"><p>
    GstAudioEncoder 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.  Subclass should
    setup for encoding and configure various base class parameters
    appropriately, notably those directing desired input data handling.
    While unlikely, it might be called more than once, if changing input
    parameters require reconfiguration.
  </p></li>
<li class="listitem"><p>
    GstAudioEncoder 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 sample data (as directed by the context's
      frame_samples and frame_max) and provides this to subclass' <em class="parameter"><code>handle_frame</code></em>.
    </p></li>
<li class="listitem"><p>
      If codec processing results in encoded data, subclass should call
      <em class="parameter"><code>gst_audio_encoder_finish_frame</code></em> to have encoded data pushed
      downstream.  Alternatively, it might also call to indicate dropped
      (non-encoded) samples.
    </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>.
    </p></li>
<li class="listitem"><p>
      During the parsing process GstAudioEncoderClass 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>
    GstAudioEncoder 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_encoder_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 either favor tracking upstream timestamps
(at the possible expense of jitter) or aim to arrange for a perfect stream of
output timestamps, depending on <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder--perfect-timestamp" title='The "perfect-timestamp" property'><span class="type">"perfect-timestamp"</span></a>.
However, in the latter case, the input may not be so perfect or ideal, which
is handled as follows.  An input timestamp is compared with the expected
timestamp as dictated by input sample stream and if the deviation is less
than <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder--tolerance" title='The "tolerance" property'><span class="type">"tolerance"</span></a>, the deviation is discarded.
Otherwise, it is considered a discontuinity and subsequent output timestamp
is resynced to the new position after performing configured discontinuity
processing.  In the non-perfect-timestamp case, an upstream variation
exceeding tolerance only leads to marking DISCONT on subsequent outgoing
(while timestamps are adjusted to upstream regardless of variation).
While DISCONT is also marked in the perfect-timestamp case, this one
optionally (see <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder--hard-resync" title='The "hard-resync" property'><span class="type">"hard-resync"</span></a>)
performs some additional steps, such as clipping of (early) input samples
or draining all currently remaining input data, depending on the direction
of the discontuinity.
</p>
<p>
If perfect timestamps are arranged, it is also possible to request baseclass
(usually set by subclass) to provide additional buffer metadata (in OFFSET
and OFFSET_END) fields according to granule defined semantics currently
needed by oggmux.  Specifically, OFFSET is set to granulepos (= sample count
including buffer) and OFFSET_END to corresponding timestamp (as determined
by same sample count and sample rate).
</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>
     Inform base class of buffer processing needs using context's
     frame_samples and frame_bytes.
  </p></li>
<li class="listitem"><p>
     Set user-configurable properties to sane defaults for format and
     implementing codec at hand, e.g. those controlling timestamp behaviour
     and discontinuity processing.
  </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_encoder_finish_frame</code></em>.
  </p></li>
</ul></div>
<p>
</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioencoder.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="GstAudioEncoder-struct"></a><h3>struct GstAudioEncoder</h3>
<pre class="programlisting">struct GstAudioEncoder;</pre>
<p>
The opaque <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> data structure.
</p>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioEncoderClass"></a><h3>struct GstAudioEncoderClass</h3>
<pre class="programlisting">struct GstAudioEncoderClass {
  GstElementClass element_class;

  /* virtual methods for subclasses */

  gboolean      (*start)              (GstAudioEncoder *enc);

  gboolean      (*stop)               (GstAudioEncoder *enc);

  gboolean      (*set_format)         (GstAudioEncoder *enc,
                                       GstAudioInfo        *info);

  GstFlowReturn (*handle_frame)       (GstAudioEncoder *enc,
                                       GstBuffer *buffer);

  void          (*flush)              (GstAudioEncoder *enc);

  GstFlowReturn (*pre_push)           (GstAudioEncoder *enc,
                                       GstBuffer **buffer);

  gboolean      (*event)              (GstAudioEncoder *enc,
                                       GstEvent *event);

  GstCaps *     (*getcaps)            (GstAudioEncoder *enc);
};
</pre>
<p>
Subclasses can override any of the available virtual methods or not, as
needed. At minimum <em class="parameter"><code>set_format</code></em> and <em class="parameter"><code>handle_frame</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="GstAudioEncoderClass.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="GstAudioEncoderClass.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="GstAudioEncoderClass.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="GstAudioEncoderClass.set-format"></a>set_format</code></em> ()</span></p></td>
<td>Notifies subclass of incoming data format.
GstAudioInfo contains the format according to provided caps.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioEncoderClass.handle-frame"></a>handle_frame</code></em> ()</span></p></td>
<td>Provides input samples (or NULL to clear any remaining data)
according to directions as configured by the subclass
using the API.  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-gstaudioencoder.html#gst-audio-encoder-finish-frame" title="gst_audio_encoder_finish_frame ()"><code class="function">gst_audio_encoder_finish_frame()</code></a>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioEncoderClass.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 encoded data.</td>
</tr>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioEncoderClass.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="GstAudioEncoderClass.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>
<tr>
<td><p><span class="term"><em class="structfield"><code><a name="GstAudioEncoderClass.getcaps"></a>getcaps</code></em> ()</span></p></td>
<td>Optional.
Allows for a custom sink getcaps implementation (e.g.
for multichannel input specification).  If not implemented,
default returns gst_audio_encoder_proxy_getcaps
applied to sink template caps.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-ENCODER-SEGMENT:CAPS"></a><h3>GST_AUDIO_ENCODER_SEGMENT()</h3>
<pre class="programlisting">#define GST_AUDIO_ENCODER_SEGMENT(obj)     (GST_AUDIO_ENCODER_CAST (obj)-&gt;segment)
</pre>
<p>
Gives the segment 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 parse instance</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-ENCODER-SINK-NAME:CAPS"></a><h3>GST_AUDIO_ENCODER_SINK_NAME</h3>
<pre class="programlisting">#define GST_AUDIO_ENCODER_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-ENCODER-SINK-PAD:CAPS"></a><h3>GST_AUDIO_ENCODER_SINK_PAD()</h3>
<pre class="programlisting">#define GST_AUDIO_ENCODER_SINK_PAD(obj) (GST_AUDIO_ENCODER_CAST (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 parse instance</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-AUDIO-ENCODER-SRC-NAME:CAPS"></a><h3>GST_AUDIO_ENCODER_SRC_NAME</h3>
<pre class="programlisting">#define GST_AUDIO_ENCODER_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-ENCODER-SRC-PAD:CAPS"></a><h3>GST_AUDIO_ENCODER_SRC_PAD()</h3>
<pre class="programlisting">#define GST_AUDIO_ENCODER_SRC_PAD(obj) (GST_AUDIO_ENCODER_CAST (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 parse instance</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-finish-frame"></a><h3>gst_audio_encoder_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_encoder_finish_frame      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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> *buffer</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> samples</code></em>);</pre>
<p>
Collects encoded data and pushes encoded data downstream.
Source pad caps must be set when this is called.
</p>
<p>
If <em class="parameter"><code>samples</code></em> &lt; 0, then best estimate is all samples provided to encoder
(subclass) so far.  <em class="parameter"><code>buf</code></em> may be NULL, in which case next number of <em class="parameter"><code>samples</code></em>
are considered discarded, e.g. as a result of discontinuous transmission,
and a discontinuity is marked.
</p>
<p>
Note that samples received in <code class="function">gst_audio_encoder_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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>buffer</code></em> :</span></p></td>
<td>encoded data</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>samples</code></em> :</span></p></td>
<td>number of samples (per channel) represented by encoded 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-encoder-get-audio-info"></a><h3>gst_audio_encoder_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_encoder_get_audio_info    (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-get-drainable"></a><h3>gst_audio_encoder_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_encoder_get_drainable     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
<p>
Queries encoder 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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-get-frame-max"></a><h3>gst_audio_encoder_get_frame_max ()</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_encoder_get_frame_max     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured maximum handled frames</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-get-frame-samples-min"></a><h3>gst_audio_encoder_get_frame_samples_min ()</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_encoder_get_frame_samples_min
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently maximum requested samples per frame</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-get-frame-samples-max"></a><h3>gst_audio_encoder_get_frame_samples_max ()</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_encoder_get_frame_samples_max
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-get-hard-min"></a><h3>gst_audio_encoder_get_hard_min ()</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_encoder_get_hard_min      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
<p>
Queries encoder hard minimum handling.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if hard minimum 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-encoder-get-hard-resync"></a><h3>gst_audio_encoder_get_hard_resync ()</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_encoder_get_hard_resync   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-get-latency"></a><h3>gst_audio_encoder_get_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_get_latency       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-get-lookahead"></a><h3>gst_audio_encoder_get_lookahead ()</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_encoder_get_lookahead     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>currently configured encoder lookahead</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-get-mark-granule"></a><h3>gst_audio_encoder_get_mark_granule ()</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_encoder_get_mark_granule  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
<p>
Queries if the encoder will handle granule marking.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if granule marking 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-encoder-get-perfect-timestamp"></a><h3>gst_audio_encoder_get_perfect_timestamp ()</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_encoder_get_perfect_timestamp
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>);</pre>
<p>
Queries encoder perfect timestamp behaviour.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE if perfect timestamp setting 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-encoder-get-tolerance"></a><h3>gst_audio_encoder_get_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">gint64</span>              gst_audio_encoder_get_tolerance     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>encoder 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-encoder-proxy-getcaps"></a><h3>gst_audio_encoder_proxy_getcaps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="returnvalue">GstCaps</span></a> *           gst_audio_encoder_proxy_getcaps     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>,
                                                         <em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-0.10/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> *caps</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 channel/rate combinations supported by downstream elements
(e.g. muxers).
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>caps</code></em> :</span></p></td>
<td>initial caps</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/gstreamer-GstCaps.html#GstCaps"><span class="type">GstCaps</span></a> owned by caller</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-drainable"></a><h3>gst_audio_encoder_set_drainable ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_drainable     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder drain handling.  If drainable, subclass might
be handed a NULL buffer to have it return any leftover encoded 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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-set-frame-max"></a><h3>gst_audio_encoder_set_frame_max ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_frame_max     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 max number of frames accepted at once (assumed minimally 1).
Requires <em class="parameter"><code>frame_samples_min</code></em> and <em class="parameter"><code>frame_samples_max</code></em> to be the equal.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>number of frames</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-frame-samples-min"></a><h3>gst_audio_encoder_set_frame_samples_min ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_frame_samples_min
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 number of samples (per channel) subclass needs to be handed,
at least or will be handed all available if 0.
</p>
<p>
If an exact number of samples is required, <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-set-frame-samples-max" title="gst_audio_encoder_set_frame_samples_max ()"><code class="function">gst_audio_encoder_set_frame_samples_max()</code></a>
must be called with the same number.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>number of samples per frame</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-frame-samples-max"></a><h3>gst_audio_encoder_set_frame_samples_max ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_frame_samples_max
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 number of samples (per channel) subclass needs to be handed,
at most or will be handed all available if 0.
</p>
<p>
If an exact number of samples is required, <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#gst-audio-encoder-set-frame-samples-min" title="gst_audio_encoder_set_frame_samples_min ()"><code class="function">gst_audio_encoder_set_frame_samples_min()</code></a>
must be called with the same number.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>number of samples per frame</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-hard-min"></a><h3>gst_audio_encoder_set_hard_min ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_hard_min      (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder hard minimum handling.  If enabled, subclass
will never be handed less samples than it configured, which otherwise
might occur near end-of-data handling.  Instead, the leftover samples
will simply be discarded.
</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-set-hard-resync"></a><h3>gst_audio_encoder_set_hard_resync ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_hard_resync   (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-latency"></a><h3>gst_audio_encoder_set_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_latency       (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder latency.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-set-lookahead"></a><h3>gst_audio_encoder_set_lookahead ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_lookahead     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder lookahead (in units of input rate samples)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>num</code></em> :</span></p></td>
<td>lookahead</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.10.36</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-audio-encoder-set-mark-granule"></a><h3>gst_audio_encoder_set_mark_granule ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_mark_granule  (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder granule handling.
</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-set-perfect-timestamp"></a><h3>gst_audio_encoder_set_perfect_timestamp ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_perfect_timestamp
                                                        (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</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 encoder perfect output timestamp preference.
</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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-encoder-set-tolerance"></a><h3>gst_audio_encoder_set_tolerance ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>                gst_audio_encoder_set_tolerance     (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</span></a> *enc</code></em>,
                                                         <em class="parameter"><code><span class="type">gint64</span> tolerance</code></em>);</pre>
<p>
Configures encoder 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>enc</code></em> :</span></p></td>
<td>a <a class="link" href="gst-plugins-base-libs-gstaudioencoder.html#GstAudioEncoder"><span class="type">GstAudioEncoder</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-gstaudioencoder.property-details"></a><h2>Property Details</h2>
<div class="refsect2">
<a name="GstAudioEncoder--hard-resync"></a><h3>The <code class="literal">"hard-resync"</code> property</h3>
<pre class="programlisting">  "hard-resync"              <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
<p>Perform clipping and sample flushing upon discontinuity.</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioEncoder--mark-granule"></a><h3>The <code class="literal">"mark-granule"</code> property</h3>
<pre class="programlisting">  "mark-granule"             <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read</pre>
<p>Apply granule semantics to buffer metadata (implies perfect-timestamp).</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioEncoder--perfect-timestamp"></a><h3>The <code class="literal">"perfect-timestamp"</code> property</h3>
<pre class="programlisting">  "perfect-timestamp"        <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a>              : Read / Write</pre>
<p>Favour perfect timestamps over tracking upstream timestamps.</p>
<p>Default value: FALSE</p>
</div>
<hr>
<div class="refsect2">
<a name="GstAudioEncoder--tolerance"></a><h3>The <code class="literal">"tolerance"</code> property</h3>
<pre class="programlisting">  "tolerance"                <span class="type">gint64</span>                : Read / Write</pre>
<p>Consider discontinuity if timestamp jitter/imperfection exceeds tolerance (ns).</p>
<p>Allowed values: &gt;= 0</p>
<p>Default value: 40000000</p>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-gstaudioencoder.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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