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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>GstVideoDecoder: GStreamer Base Plugins 1.0 Library Reference Manual</title>
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<a href="#gst-plugins-base-libs-GstVideoDecoder.description" class="shortcut">Description</a></span>
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<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-GstVideoDecoder.top_of_page"></a>GstVideoDecoder</span></h2>
<p>GstVideoDecoder — Base class for video decoders</p>
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<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDecoder.functions"></a><h2>Functions</h2>
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<col width="150px" class="functions_return">
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<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-ERROR:CAPS" title="GST_VIDEO_DECODER_ERROR()">GST_VIDEO_DECODER_ERROR</a><span class="c_punctuation">()</span>
</td>
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<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-SINK-PAD:CAPS" title="GST_VIDEO_DECODER_SINK_PAD()">GST_VIDEO_DECODER_SINK_PAD</a><span class="c_punctuation">()</span>
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</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-SRC-PAD:CAPS" title="GST_VIDEO_DECODER_SRC_PAD()">GST_VIDEO_DECODER_SRC_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-GstVideoDecoder.html#GST-VIDEO-DECODER-STREAM-LOCK:CAPS" title="GST_VIDEO_DECODER_STREAM_LOCK()">GST_VIDEO_DECODER_STREAM_LOCK</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-GstVideoDecoder.html#GST-VIDEO-DECODER-STREAM-UNLOCK:CAPS" title="GST_VIDEO_DECODER_STREAM_UNLOCK()">GST_VIDEO_DECODER_STREAM_UNLOCK</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-GstVideoDecoder.html#GST-VIDEO-DECODER-INPUT-SEGMENT:CAPS" title="GST_VIDEO_DECODER_INPUT_SEGMENT()">GST_VIDEO_DECODER_INPUT_SEGMENT</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-GstVideoDecoder.html#GST-VIDEO-DECODER-OUTPUT-SEGMENT:CAPS" title="GST_VIDEO_DECODER_OUTPUT_SEGMENT()">GST_VIDEO_DECODER_OUTPUT_SEGMENT</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-GstVideoDecoder.html#gst-video-decoder-add-to-frame" title="gst_video_decoder_add_to_frame ()">gst_video_decoder_add_to_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBuffer.html#GstBuffer-struct"><span class="returnvalue">GstBuffer</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-allocate-output-buffer" title="gst_video_decoder_allocate_output_buffer ()">gst_video_decoder_allocate_output_buffer</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-allocate-output-frame" title="gst_video_decoder_allocate_output_frame ()">gst_video_decoder_allocate_output_frame</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-GstVideoDecoder.html#gst-video-decoder-get-allocator" title="gst_video_decoder_get_allocator ()">gst_video_decoder_get_allocator</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBufferPool.html#GstBufferPool-struct"><span class="returnvalue">GstBufferPool</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-buffer-pool" title="gst_video_decoder_get_buffer_pool ()">gst_video_decoder_get_buffer_pool</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-drop-frame" title="gst_video_decoder_drop_frame ()">gst_video_decoder_drop_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-finish-frame" title="gst_video_decoder_finish_frame ()">gst_video_decoder_finish_frame</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-GstVideoDecoder.html#gst-video-decoder-release-frame" title="gst_video_decoder_release_frame ()">gst_video_decoder_release_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-negotiate" title="gst_video_decoder_negotiate ()">gst_video_decoder_negotiate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="returnvalue">GstVideoCodecFrame</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-frame" title="gst_video_decoder_get_frame ()">gst_video_decoder_get_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-frames" title="gst_video_decoder_get_frames ()">gst_video_decoder_get_frames</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-max-decode-time" title="gst_video_decoder_get_max_decode_time ()">gst_video_decoder_get_max_decode_time</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-max-errors" title="gst_video_decoder_get_max_errors ()">gst_video_decoder_get_max_errors</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="returnvalue">GstVideoCodecFrame</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-oldest-frame" title="gst_video_decoder_get_oldest_frame ()">gst_video_decoder_get_oldest_frame</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-packetized" title="gst_video_decoder_get_packetized ()">gst_video_decoder_get_packetized</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-pending-frame-size" title="gst_video_decoder_get_pending_frame_size ()">gst_video_decoder_get_pending_frame_size</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-qos-proportion" title="gst_video_decoder_get_qos_proportion ()">gst_video_decoder_get_qos_proportion</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-have-frame" title="gst_video_decoder_have_frame ()">gst_video_decoder_have_frame</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-GstVideoDecoder.html#gst-video-decoder-get-latency" title="gst_video_decoder_get_latency ()">gst_video_decoder_get_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-GstVideoDecoder.html#gst-video-decoder-set-latency" title="gst_video_decoder_set_latency ()">gst_video_decoder_set_latency</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-estimate-rate" title="gst_video_decoder_get_estimate_rate ()">gst_video_decoder_get_estimate_rate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="returnvalue">GstVideoCodecState</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-output-state" title="gst_video_decoder_get_output_state ()">gst_video_decoder_get_output_state</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-GstVideoDecoder.html#gst-video-decoder-set-estimate-rate" title="gst_video_decoder_set_estimate_rate ()">gst_video_decoder_set_estimate_rate</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="returnvalue">GstVideoCodecState</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-set-output-state" title="gst_video_decoder_set_output_state ()">gst_video_decoder_set_output_state</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-GstVideoDecoder.html#gst-video-decoder-set-max-errors" title="gst_video_decoder_set_max_errors ()">gst_video_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-GstVideoDecoder.html#gst-video-decoder-set-packetized" title="gst_video_decoder_set_packetized ()">gst_video_decoder_set_packetized</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-get-needs-format" title="gst_video_decoder_get_needs_format ()">gst_video_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-GstVideoDecoder.html#gst-video-decoder-set-needs-format" title="gst_video_decoder_set_needs_format ()">gst_video_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-GstVideoDecoder.html#gst-video-decoder-merge-tags" title="gst_video_decoder_merge_tags ()">gst_video_decoder_merge_tags</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0GstCaps.html#GstCaps-struct"><span class="returnvalue">GstCaps</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-proxy-getcaps" title="gst_video_decoder_proxy_getcaps ()">gst_video_decoder_proxy_getcaps</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDecoder.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="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-FLOW-NEED-DATA:CAPS" title="GST_VIDEO_DECODER_FLOW_NEED_DATA">GST_VIDEO_DECODER_FLOW_NEED_DATA</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-MAX-ERRORS:CAPS" title="GST_VIDEO_DECODER_MAX_ERRORS">GST_VIDEO_DECODER_MAX_ERRORS</a></td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GST-VIDEO-DECODER-SINK-NAME:CAPS" title="GST_VIDEO_DECODER_SINK_NAME">GST_VIDEO_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-GstVideoDecoder.html#GST-VIDEO-DECODER-SRC-NAME:CAPS" title="GST_VIDEO_DECODER_SRC_NAME">GST_VIDEO_DECODER_SRC_NAME</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder">GstVideoDecoder</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoderClass" title="struct GstVideoDecoderClass">GstVideoDecoderClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDecoder.description"></a><h2>Description</h2>
<p>This base class is for video decoders turning encoded data into raw video
frames.</p>
<p>The GstVideoDecoder base class and derived subclasses 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, GstVideoDecoder calls <em class="parameter"><code>start</code></em> when the decoder element
is activated, which allows the subclass to perform any global setup.
</p></li>
<li class="listitem"><p>
GstVideoDecoder calls <em class="parameter"><code>set_format</code></em> to inform the subclass of caps
describing input video data that it is about to receive, including
possibly configuration data.
While unlikely, it might be called more than once, if changing input
parameters require reconfiguration.
</p></li>
<li class="listitem"><p>
Incoming data buffers are processed as needed, described in Data
Processing below.
</p></li>
<li class="listitem"><p>
GstVideoDecoder 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>
The base class gathers input data, and optionally allows subclass
to parse this into subsequently manageable chunks, typically
corresponding to and referred to as 'frames'.
</p></li>
<li class="listitem"><p>
Each input frame is provided in turn to the subclass' <em class="parameter"><code>handle_frame</code></em>
callback.
The ownership of the frame is given to the <em class="parameter"><code>handle_frame</code></em> callback.
</p></li>
<li class="listitem"><p>
If codec processing results in decoded data, the subclass should call
<em class="parameter"><code>gst_video_decoder_finish_frame</code></em> to have decoded data pushed.
downstream. Otherwise, the subclass must call
<em class="parameter"><code>gst_video_decoder_drop_frame</code></em>, to allow the base class to do timestamp
and offset tracking, and possibly to requeue the frame for a later
attempt in the case of reverse playback.
</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>
The GstVideoDecoder class calls <em class="parameter"><code>stop</code></em> to inform the subclass that data
parsing will be stopped.
</p></li></ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Additional Notes</b></p>
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>Seeking/Flushing</b></p>
<ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p>
When the pipeline is seeked or otherwise flushed, the subclass is
informed via a call to its <em class="parameter"><code>reset</code></em> callback, with the hard parameter
set to true. This indicates the subclass should drop any internal data
queues and timestamps and prepare for a fresh set of buffers to arrive
for parsing and decoding.
</p></li></ul>
</div></li>
<li class="listitem"><div class="itemizedlist">
<p class="title"><b>End Of Stream</b></p>
<ul class="itemizedlist" style="list-style-type: circle; "><li class="listitem"><p>
At end-of-stream, the subclass <em class="parameter"><code>parse</code></em> function may be called some final
times with the at_eos parameter set to true, indicating that the element
should not expect any more data to be arriving, and it should parse and
remaining frames and call <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-have-frame" title="gst_video_decoder_have_frame ()"><code class="function">gst_video_decoder_have_frame()</code></a> if possible.
</p></li></ul>
</div></li>
</ul>
</div></li>
</ol></div>
<p>The 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 provide information about the ouptput caps, when they are known.
This may be when the base class calls the subclass' <em class="parameter"><code>set_format</code></em>
function,
though it might be during decoding, before calling
<em class="parameter"><code>gst_video_decoder_finish_frame</code></em>
. This is done via
<em class="parameter"><code>gst_video_decoder_set_output_state</code></em>
</p>
<p>The subclass is also responsible for providing (presentation) timestamps
(likely based on corresponding input ones). If that is not applicable
or possible, the base class provides limited framerate based interpolation.</p>
<p>Similarly, the base class provides some limited (legacy) seeking support
if specifically requested by the subclass, 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. To enable it, a subclass should call
<em class="parameter"><code>gst_video_decoder_set_estimate_rate</code></em>
to enable handling of incoming
byte-streams.</p>
<p>The base class provides some support for reverse playback, in particular
in case incoming data is not packetized or upstream does not provide
fragments on keyframe boundaries. However, the subclass should then be
prepared for the parsing and frame processing stage to occur separately
(in normal forward processing, the latter immediately follows the former),
The subclass also needs to ensure the parsing stage properly marks
keyframes, unless it knows the upstream elements will do so properly for
incoming data.</p>
<p>The bare minimum that a functional subclass needs to implement is:</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>
Inform the base class of output caps via
<em class="parameter"><code>gst_video_decoder_set_output_state</code></em>
</p></li>
<li class="listitem"><p>
Parse input data, if it is not considered packetized from upstream
Data will be provided to <em class="parameter"><code>parse</code></em> which should invoke
<em class="parameter"><code>gst_video_decoder_add_to_frame</code></em> and <em class="parameter"><code>gst_video_decoder_have_frame</code></em> to
separate the data belonging to each video frame.
</p></li>
<li class="listitem"><p>
Accept data in <em class="parameter"><code>handle_frame</code></em> and provide decoded results to
<em class="parameter"><code>gst_video_decoder_finish_frame</code></em>, or call <em class="parameter"><code>gst_video_decoder_drop_frame</code></em>.
</p></li>
</ul></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-GstVideoDecoder.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-ERROR:CAPS"></a><h3>GST_VIDEO_DECODER_ERROR()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_ERROR(el, w, domain, code, text, debug, ret)</pre>
<p>Utility function that video 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="GST-VIDEO-DECODER-ERROR.parameters"></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 video decoder element that generates the error</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>w</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 <span class="type">gstreamer-GstGError</span>)</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 <span class="type">gstreamer-GstGError</span>)</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-VIDEO-DECODER-SINK-PAD:CAPS"></a><h3>GST_VIDEO_DECODER_SINK_PAD()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_SINK_PAD(obj) (((GstVideoDecoder *) (obj))->sinkpad)
</pre>
<p>Gives the pointer to the sink <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstPad-struct"><span class="type">GstPad</span></a> object of the element.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-SINK-PAD.parameters"></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>a <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-SRC-PAD:CAPS"></a><h3>GST_VIDEO_DECODER_SRC_PAD()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_SRC_PAD(obj) (((GstVideoDecoder *) (obj))->srcpad)
</pre>
<p>Gives the pointer to the source <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstPad-struct"><span class="type">GstPad</span></a> object of the element.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-SRC-PAD.parameters"></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>a <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-STREAM-LOCK:CAPS"></a><h3>GST_VIDEO_DECODER_STREAM_LOCK()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_STREAM_LOCK(decoder) g_rec_mutex_lock (&GST_VIDEO_DECODER (decoder)->stream_lock)
</pre>
<p>Obtain a lock to protect the decoder function from concurrent access.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-STREAM-LOCK.parameters"></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>video decoder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-STREAM-UNLOCK:CAPS"></a><h3>GST_VIDEO_DECODER_STREAM_UNLOCK()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_STREAM_UNLOCK(decoder) g_rec_mutex_unlock (&GST_VIDEO_DECODER (decoder)->stream_lock)
</pre>
<p>Release the lock that protects the decoder function from concurrent access.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-STREAM-UNLOCK.parameters"></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>video decoder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-INPUT-SEGMENT:CAPS"></a><h3>GST_VIDEO_DECODER_INPUT_SEGMENT()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_INPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->input_segment)
</pre>
<p>Gives the segment of the element.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-INPUT-SEGMENT.parameters"></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 decoder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-OUTPUT-SEGMENT:CAPS"></a><h3>GST_VIDEO_DECODER_OUTPUT_SEGMENT()</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_OUTPUT_SEGMENT(obj) (GST_VIDEO_DECODER_CAST (obj)->output_segment)
</pre>
<p>Gives the segment of the element.</p>
<div class="refsect3">
<a name="GST-VIDEO-DECODER-OUTPUT-SEGMENT.parameters"></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 decoder instance</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-add-to-frame"></a><h3>gst_video_decoder_add_to_frame ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_add_to_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><span class="type">int</span> n_bytes</code></em>);</pre>
<p>Removes next <em class="parameter"><code>n_bytes</code></em>
of input data and adds it to currently parsed frame.</p>
<div class="refsect3">
<a name="gst-video-decoder-add-to-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>n_bytes</p></td>
<td class="parameter_description"><p>the number of bytes to add</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-allocate-output-buffer"></a><h3>gst_video_decoder_allocate_output_buffer ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBuffer.html#GstBuffer-struct"><span class="returnvalue">GstBuffer</span></a> *
gst_video_decoder_allocate_output_buffer
(<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Helper function that allocates a buffer to hold a video frame for <em class="parameter"><code>decoder</code></em>
's
current <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>.</p>
<p>You should use <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-allocate-output-frame" title="gst_video_decoder_allocate_output_frame ()"><code class="function">gst_video_decoder_allocate_output_frame()</code></a> instead of this
function, if possible at all.</p>
<div class="refsect3">
<a name="gst-video-decoder-allocate-output-buffer.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-allocate-output-buffer.returns"></a><h4>Returns</h4>
<p> allocated buffer, or NULL if no buffer could be
allocated (e.g. when downstream is flushing or shutting down). </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-video-decoder-allocate-output-frame"></a><h3>gst_video_decoder_allocate_output_frame ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_video_decoder_allocate_output_frame
(<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> *frame</code></em>);</pre>
<p>Helper function that allocates a buffer to hold a video frame for <em class="parameter"><code>decoder</code></em>
's
current <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>. Subclass should already have configured video
state and set src pad caps.</p>
<p>The buffer allocated here is owned by the frame and you should only
keep references to the frame, not the buffer.</p>
<div class="refsect3">
<a name="gst-video-decoder-allocate-output-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-allocate-output-frame.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GST-FLOW-OK:CAPS"><code class="literal">GST_FLOW_OK</code></a> if an output buffer could be allocated</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-allocator"></a><h3>gst_video_decoder_get_allocator ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_get_allocator (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstAllocator.html#GstAllocator-struct"><span class="type">GstAllocator</span></a> **allocator</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstAllocator.html#GstAllocationParams-struct"><span class="type">GstAllocationParams</span></a> *params</code></em>);</pre>
<p>Lets <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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="gst-video-decoder-get-allocator.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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-1.0GstAllocator.html#GstAllocator-struct"><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-video-decoder-get-buffer-pool"></a><h3>gst_video_decoder_get_buffer_pool ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBufferPool.html#GstBufferPool-struct"><span class="returnvalue">GstBufferPool</span></a> *
gst_video_decoder_get_buffer_pool (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<div class="refsect3">
<a name="gst-video-decoder-get-buffer-pool.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-buffer-pool.returns"></a><h4>Returns</h4>
<p> the instance of the <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstBufferPool.html#GstBufferPool-struct"><span class="type">GstBufferPool</span></a> used
by the decoder; free it after use it. </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-video-decoder-drop-frame"></a><h3>gst_video_decoder_drop_frame ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_video_decoder_drop_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> *frame</code></em>);</pre>
<p>Similar to <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-finish-frame" title="gst_video_decoder_finish_frame ()"><code class="function">gst_video_decoder_finish_frame()</code></a>, but drops <em class="parameter"><code>frame</code></em>
in any
case and posts a QoS message with the frame's details on the bus.
In any case, the frame is considered finished and released.</p>
<div class="refsect3">
<a name="gst-video-decoder-drop-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame</p></td>
<td class="parameter_description"><p> the <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> to drop. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-drop-frame.returns"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a>, usually GST_FLOW_OK.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-finish-frame"></a><h3>gst_video_decoder_finish_frame ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_video_decoder_finish_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> *frame</code></em>);</pre>
<p><em class="parameter"><code>frame</code></em>
should have a valid decoded data buffer, whose metadata fields
are then appropriately set according to frame data and pushed downstream.
If no output data is provided, <em class="parameter"><code>frame</code></em>
is considered skipped.
In any case, the frame is considered finished and released.</p>
<p>After calling this function the output buffer of the frame is to be
considered read-only. This function will also change the metadata
of the buffer.</p>
<div class="refsect3">
<a name="gst-video-decoder-finish-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame</p></td>
<td class="parameter_description"><p> a decoded <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-finish-frame.returns"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a> resulting from sending data downstream</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-release-frame"></a><h3>gst_video_decoder_release_frame ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_release_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> *frame</code></em>);</pre>
<p>Similar to <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-drop-frame" title="gst_video_decoder_drop_frame ()"><code class="function">gst_video_decoder_drop_frame()</code></a>, but simply releases <em class="parameter"><code>frame</code></em>
without any processing other than removing it from list of pending frames,
after which it is considered finished and released.</p>
<div class="refsect3">
<a name="gst-video-decoder-release-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame</p></td>
<td class="parameter_description"><p> the <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> to release. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: 1.2.2</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-negotiate"></a><h3>gst_video_decoder_negotiate ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_video_decoder_negotiate (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Negotiate with downstream elements to currently configured <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>.
Unmark GST_PAD_FLAG_NEED_RECONFIGURE in any case. But mark it again if
negotiate fails.</p>
<div class="refsect3">
<a name="gst-video-decoder-negotiate.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-negotiate.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><span class="type">TRUE</span></a> if the negotiation succeeded, else <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#FALSE:CAPS"><span class="type">FALSE</span></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-frame"></a><h3>gst_video_decoder_get_frame ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="returnvalue">GstVideoCodecFrame</span></a> *
gst_video_decoder_get_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><span class="type">int</span> frame_number</code></em>);</pre>
<p>Get a pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a></p>
<div class="refsect3">
<a name="gst-video-decoder-get-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame_number</p></td>
<td class="parameter_description"><p>system_frame_number of a frame</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-frame.returns"></a><h4>Returns</h4>
<p> pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> identified by <em class="parameter"><code>frame_number</code></em>
. </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-video-decoder-get-frames"></a><h3>gst_video_decoder_get_frames ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
gst_video_decoder_get_frames (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Get all pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a></p>
<div class="refsect3">
<a name="gst-video-decoder-get-frames.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-frames.returns"></a><h4>Returns</h4>
<p> pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> GstVideoCodecFrame]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-max-decode-time"></a><h3>gst_video_decoder_get_max_decode_time ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>
gst_video_decoder_get_max_decode_time (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a> *frame</code></em>);</pre>
<p>Determines maximum possible decoding time for <em class="parameter"><code>frame</code></em>
that will
allow it to decode and arrive in time (as determined by QoS events).
In particular, a negative result means decoding in time is no longer possible
and should therefore occur as soon/skippy as possible.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-max-decode-time.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>frame</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-max-decode-time.returns"></a><h4>Returns</h4>
<p> max decoding time.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-max-errors"></a><h3>gst_video_decoder_get_max_errors ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gst_video_decoder_get_max_errors (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>);</pre>
<div class="refsect3">
<a name="gst-video-decoder-get-max-errors.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-max-errors.returns"></a><h4>Returns</h4>
<p> currently configured decoder tolerated error count.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-oldest-frame"></a><h3>gst_video_decoder_get_oldest_frame ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="returnvalue">GstVideoCodecFrame</span></a> *
gst_video_decoder_get_oldest_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Get the oldest pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a></p>
<div class="refsect3">
<a name="gst-video-decoder-get-oldest-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-oldest-frame.returns"></a><h4>Returns</h4>
<p> oldest pending unfinished <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecFrame" title="struct GstVideoCodecFrame"><span class="type">GstVideoCodecFrame</span></a>. </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-video-decoder-get-packetized"></a><h3>gst_video_decoder_get_packetized ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_video_decoder_get_packetized (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Queries whether input data is considered packetized or not by the
base class.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-packetized.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-packetized.returns"></a><h4>Returns</h4>
<p> TRUE if input data is considered packetized.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-pending-frame-size"></a><h3>gst_video_decoder_get_pending_frame_size ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gsize"><span class="returnvalue">gsize</span></a>
gst_video_decoder_get_pending_frame_size
(<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Returns the number of bytes previously added to the current frame
by calling <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-add-to-frame" title="gst_video_decoder_add_to_frame ()"><code class="function">gst_video_decoder_add_to_frame()</code></a>.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-pending-frame-size.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-pending-frame-size.returns"></a><h4>Returns</h4>
<p> The number of bytes pending for the current frame</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-qos-proportion"></a><h3>gst_video_decoder_get_qos_proportion ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gdouble"><span class="returnvalue">gdouble</span></a>
gst_video_decoder_get_qos_proportion (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<div class="refsect3">
<a name="gst-video-decoder-get-qos-proportion.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a>
current QoS proportion, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-qos-proportion.returns"></a><h4>Returns</h4>
<p> The current QoS proportion.</p>
</div>
<p class="since">Since: 1.0.3</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-have-frame"></a><h3>gst_video_decoder_have_frame ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>
gst_video_decoder_have_frame (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Gathers all data collected for currently parsed frame, gathers corresponding
metadata and passes it along for further processing, i.e. <em class="parameter"><code>handle_frame</code></em>
.</p>
<div class="refsect3">
<a name="gst-video-decoder-have-frame.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-have-frame.returns"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-latency"></a><h3>gst_video_decoder_get_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_get_latency (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *min_latency</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> *max_latency</code></em>);</pre>
<p>Query the configured decoder latency. Results will be returned via
<em class="parameter"><code>min_latency</code></em>
and <em class="parameter"><code>max_latency</code></em>
.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-latency.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min_latency</p></td>
<td class="parameter_description"><p> address of variable in which to store the
configured minimum latency, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </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_latency</p></td>
<td class="parameter_description"><p> address of variable in which to store the
configured mximum latency, or <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. </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-video-decoder-set-latency"></a><h3>gst_video_decoder_set_latency ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_set_latency (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> min_latency</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstClock.html#GstClockTime"><span class="type">GstClockTime</span></a> max_latency</code></em>);</pre>
<p>Lets <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> sub-classes tell the baseclass what the decoder
latency is. Will also post a LATENCY message on the bus so the pipeline
can reconfigure its global latency.</p>
<div class="refsect3">
<a name="gst-video-decoder-set-latency.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min_latency</p></td>
<td class="parameter_description"><p>minimum latency</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max_latency</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-video-decoder-get-estimate-rate"></a><h3>gst_video_decoder_get_estimate_rate ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gst_video_decoder_get_estimate_rate (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>);</pre>
<div class="refsect3">
<a name="gst-video-decoder-get-estimate-rate.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-estimate-rate.returns"></a><h4>Returns</h4>
<p> currently configured byte to time conversion setting</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-output-state"></a><h3>gst_video_decoder_get_output_state ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="returnvalue">GstVideoCodecState</span></a> *
gst_video_decoder_get_output_state (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>);</pre>
<p>Get the <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a> currently describing the output stream.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-output-state.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-output-state.returns"></a><h4>Returns</h4>
<p> <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a> describing format of video data. </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-video-decoder-set-estimate-rate"></a><h3>gst_video_decoder_set_estimate_rate ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_set_estimate_rate (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-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="gst-video-decoder-set-estimate-rate.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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-video-decoder-set-output-state"></a><h3>gst_video_decoder_set_output_state ()</h3>
<pre class="programlisting"><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="returnvalue">GstVideoCodecState</span></a> *
gst_video_decoder_set_output_state (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a> fmt</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> width</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#guint"><span class="type">guint</span></a> height</code></em>,
<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a> *reference</code></em>);</pre>
<p>Creates a new <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a> with the specified <em class="parameter"><code>fmt</code></em>
, <em class="parameter"><code>width</code></em>
and <em class="parameter"><code>height</code></em>
as the output state for the decoder.
Any previously set output state on <em class="parameter"><code>decoder</code></em>
will be replaced by the newly
created one.</p>
<p>If the subclass wishes to copy over existing fields (like pixel aspec ratio,
or framerate) from an existing <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>, it can be provided as a
<em class="parameter"><code>reference</code></em>
.</p>
<p>If the subclass wishes to override some fields from the output state (like
pixel-aspect-ratio or framerate) it can do so on the returned <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>.</p>
<p>The new output state will only take effect (set on pads and buffers) starting
from the next call to <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#gst-video-decoder-finish-frame" title="gst_video_decoder_finish_frame ()"><code class="function">gst_video_decoder_finish_frame()</code></a>.</p>
<div class="refsect3">
<a name="gst-video-decoder-set-output-state.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>fmt</p></td>
<td class="parameter_description"><p>a <a class="link" href="gst-plugins-base-libs-gstvideo.html#GstVideoFormat" title="enum GstVideoFormat"><span class="type">GstVideoFormat</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>width</p></td>
<td class="parameter_description"><p>The width in pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>height</p></td>
<td class="parameter_description"><p>The height in pixels</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>reference</p></td>
<td class="parameter_description"><p> An optional reference <a class="link" href="gst-plugins-base-libs-gstvideoutils.html#GstVideoCodecState" title="struct GstVideoCodecState"><span class="type">GstVideoCodecState</span></a>. </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>][<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-set-output-state.returns"></a><h4>Returns</h4>
<p> the newly configured output state. </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-video-decoder-set-max-errors"></a><h3>gst_video_decoder_set_max_errors ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_set_max_errors (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-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_VIDEO_DECODER_MAX_ERRORS.</p>
<p>The '-1' option was added in 1.4</p>
<div class="refsect3">
<a name="gst-video-decoder-set-max-errors.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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-video-decoder-set-packetized"></a><h3>gst_video_decoder_set_packetized ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_set_packetized (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> packetized</code></em>);</pre>
<p>Allows baseclass to consider input data as packetized or not. If the
input is packetized, then the <em class="parameter"><code>parse</code></em>
method will not be called.</p>
<div class="refsect3">
<a name="gst-video-decoder-set-packetized.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>packetized</p></td>
<td class="parameter_description"><p>whether the input data should be considered as packetized.</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-get-needs-format"></a><h3>gst_video_decoder_get_needs_format ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glibglib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_video_decoder_get_needs_format (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>);</pre>
<p>Queries decoder required format handling.</p>
<div class="refsect3">
<a name="gst-video-decoder-get-needs-format.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-video-decoder-get-needs-format.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glibglib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if required format handling is enabled.</p>
</div>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-set-needs-format"></a><h3>gst_video_decoder_set_needs_format ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_set_needs_format (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *dec</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glibglib-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>
<div class="refsect3">
<a name="gst-video-decoder-set-needs-format.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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>
<p class="since">Since: 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="gst-video-decoder-merge-tags"></a><h3>gst_video_decoder_merge_tags ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_video_decoder_merge_tags (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstTagList.html#GstTagList-struct"><span class="type">GstTagList</span></a> *tags</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstTagList.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>
<p>MT safe.</p>
<div class="refsect3">
<a name="gst-video-decoder-merge-tags.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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-1.0GstTagList.html#GstTagList-struct"><span class="type">GstTagList</span></a> to merge, or NULL to unset
previously-set tags. </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-1.0GstTagList.html#GstTagMergeMode"><span class="type">GstTagMergeMode</span></a> to use, usually <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstTagList.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-video-decoder-proxy-getcaps"></a><h3>gst_video_decoder_proxy_getcaps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstCaps.html#GstCaps-struct"><span class="returnvalue">GstCaps</span></a> *
gst_video_decoder_proxy_getcaps (<em class="parameter"><code><a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> *decoder</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstCaps.html#GstCaps-struct"><span class="type">GstCaps</span></a> *caps</code></em>,
<em class="parameter"><code><a href="/usr/share/gtk-doc/html/gstreamer-1.0GstCaps.html#GstCaps-struct"><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 resolution/format/... combinations supported by downstream
elements.</p>
<div class="refsect3">
<a name="gst-video-decoder-proxy-getcaps.parameters"></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-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</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="gst-video-decoder-proxy-getcaps.returns"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0GstCaps.html#GstCaps-struct"><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-GstVideoDecoder.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-FLOW-NEED-DATA:CAPS"></a><h3>GST_VIDEO_DECODER_FLOW_NEED_DATA</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
</pre>
<p>Returned while parsing to indicate more data is needed.</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-MAX-ERRORS:CAPS"></a><h3>GST_VIDEO_DECODER_MAX_ERRORS</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_MAX_ERRORS 10
</pre>
<p>Default maximum number of errors tolerated before signaling error.</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-SINK-NAME:CAPS"></a><h3>GST_VIDEO_DECODER_SINK_NAME</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_SINK_NAME "sink"
</pre>
<p>The name of the templates for the sink pad.</p>
</div>
<hr>
<div class="refsect2">
<a name="GST-VIDEO-DECODER-SRC-NAME:CAPS"></a><h3>GST_VIDEO_DECODER_SRC_NAME</h3>
<pre class="programlisting">#define GST_VIDEO_DECODER_SRC_NAME "src"
</pre>
<p>The name of the templates for the source pad.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoDecoder"></a><h3>struct GstVideoDecoder</h3>
<pre class="programlisting">struct GstVideoDecoder {
};
</pre>
<p>The opaque <a class="link" href="gst-plugins-base-libs-GstVideoDecoder.html#GstVideoDecoder" title="struct GstVideoDecoder"><span class="type">GstVideoDecoder</span></a> data structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstVideoDecoderClass"></a><h3>struct GstVideoDecoderClass</h3>
<pre class="programlisting">struct GstVideoDecoderClass {
gboolean (*open) (GstVideoDecoder *decoder);
gboolean (*close) (GstVideoDecoder *decoder);
gboolean (*start) (GstVideoDecoder *decoder);
gboolean (*stop) (GstVideoDecoder *decoder);
GstFlowReturn (*parse) (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame,
GstAdapter *adapter,
gboolean at_eos);
gboolean (*set_format) (GstVideoDecoder *decoder,
GstVideoCodecState * state);
gboolean (*reset) (GstVideoDecoder *decoder,
gboolean hard);
GstFlowReturn (*finish) (GstVideoDecoder *decoder);
GstFlowReturn (*handle_frame) (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame);
gboolean (*sink_event) (GstVideoDecoder *decoder,
GstEvent *event);
gboolean (*src_event) (GstVideoDecoder *decoder,
GstEvent *event);
gboolean (*negotiate) (GstVideoDecoder *decoder);
gboolean (*decide_allocation) (GstVideoDecoder *decoder, GstQuery *query);
gboolean (*propose_allocation) (GstVideoDecoder *decoder, GstQuery * query);
gboolean (*flush) (GstVideoDecoder *decoder);
gboolean (*sink_query) (GstVideoDecoder *decoder,
GstQuery *query);
gboolean (*src_query) (GstVideoDecoder *decoder,
GstQuery *query);
GstCaps* (*getcaps) (GstVideoDecoder *decoder,
GstCaps *filter);
GstFlowReturn (*drain) (GstVideoDecoder *decoder);
gboolean (*transform_meta) (GstVideoDecoder *decoder,
GstVideoCodecFrame *frame,
GstMeta * meta);
};
</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>
needs to be overridden, and <em class="parameter"><code>set_format</code></em>
and likely as well. If non-packetized input is supported or expected,
<em class="parameter"><code>parse</code></em>
needs to be overridden as well.</p>
<div class="refsect3">
<a name="GstVideoDecoderClass.members"></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><em class="structfield"><code><a name="GstVideoDecoderClass.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="GstVideoDecoderClass.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="GstVideoDecoderClass.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="GstVideoDecoderClass.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="GstVideoDecoderClass.parse"></a>parse</code></em> ()</p></td>
<td class="struct_member_description"><p>Required for non-packetized input.
Allows chopping incoming data into manageable units (frames)
for subsequent decoding.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.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="GstVideoDecoderClass.reset"></a>reset</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Allows subclass (decoder) to perform post-seek semantics reset.
Deprecated.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.finish"></a>finish</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called to request subclass to dispatch any pending remaining
data at EOS. Sub-classes can refuse to decode new data after.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.handle-frame"></a>handle_frame</code></em> ()</p></td>
<td class="struct_member_description"><p>Provides input data frame to subclass.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.sink-event"></a>sink_event</code></em> ()</p></td>
<td class="struct_member_description"><p>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).
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="GstVideoDecoderClass.src-event"></a>src_event</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Event handler on the source pad. This function should return
TRUE if the event was handled and should be discarded
(i.e. not unref'ed).
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="GstVideoDecoderClass.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="GstVideoDecoderClass.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="GstVideoDecoderClass.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="GstVideoDecoderClass.flush"></a>flush</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Flush all remaining data from the decoder without
pushing it downstream. Since: 1.2</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.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 1.4</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.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 1.4</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstVideoDecoderClass.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_video_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="GstVideoDecoderClass.drain"></a>drain</code></em> ()</p></td>
<td class="struct_member_description"><p>Optional.
Called to request subclass to decode any data it can at this
point, but that more data may arrive after. (e.g. at segment end).
Sub-classes should be prepared to handle new data afterward,
or seamless segment processing will break. 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="GstVideoDecoderClass.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 is copies all meta without
tags and meta with only the "video" tag. subclasses can
implement this method and return <a href="/usr/share/gtk-doc/html/glibglib-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>
</div>
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