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  30 <a name="gst-plugins-bad-libs-GstBaseVideoDecoder"></a><div class="titlepage"></div>
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  33 <h2><span class="refentrytitle"><a name="gst-plugins-bad-libs-GstBaseVideoDecoder.top_of_page"></a>GstBaseVideoDecoder</span></h2>
  34 <p>GstBaseVideoDecoder — Base class for video decoders</p>
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  38 <div class="refsynopsisdiv">
  39 <a name="gst-plugins-bad-libs-GstBaseVideoDecoder.synopsis"></a><h2>Synopsis</h2>
  40 <pre class="synopsis">#define             <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GST-BASE-VIDEO-DECODER-SINK-NAME:CAPS" title="GST_BASE_VIDEO_DECODER_SINK_NAME">GST_BASE_VIDEO_DECODER_SINK_NAME</a>
  41 #define             <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GST-BASE-VIDEO-DECODER-SRC-NAME:CAPS" title="GST_BASE_VIDEO_DECODER_SRC_NAME">GST_BASE_VIDEO_DECODER_SRC_NAME</a>
  42 #define             <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GST-BASE-VIDEO-DECODER-FLOW-NEED-DATA:CAPS" title="GST_BASE_VIDEO_DECODER_FLOW_NEED_DATA">GST_BASE_VIDEO_DECODER_FLOW_NEED_DATA</a>
  43 #define             <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GST-BASE-VIDEO-DECODER-FLOW-DROPPED:CAPS" title="GST_BASE_VIDEO_DECODER_FLOW_DROPPED">GST_BASE_VIDEO_DECODER_FLOW_DROPPED</a>
  44 #define             <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GST-BASE-AUDIO-DECODER-ERROR:CAPS" title="GST_BASE_AUDIO_DECODER_ERROR()">GST_BASE_AUDIO_DECODER_ERROR</a>        (el,
  45                                                          w,
  46                                                          domain,
  47                                                          code,
  48                                                          text,
  49                                                          debug,
  50                                                          ret)
  51 struct              <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder">GstBaseVideoDecoder</a>;
  52 struct              <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoderClass" title="struct GstBaseVideoDecoderClass">GstBaseVideoDecoderClass</a>;
  53 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-class-set-capture-pattern" title="gst_base_video_decoder_class_set_capture_pattern ()">gst_base_video_decoder_class_set_capture_pattern</a>
  54                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoderClass" title="struct GstBaseVideoDecoderClass"><span class="type">GstBaseVideoDecoderClass</span></a> *klass</code></em>,
  55                                                          <em class="parameter"><code><span class="type">guint32</span> mask</code></em>,
  56                                                          <em class="parameter"><code><span class="type">guint32</span> pattern</code></em>);
  57 <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="returnvalue">GstVideoFrame</span></a> *     <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-get-frame" title="gst_base_video_decoder_get_frame ()">gst_base_video_decoder_get_frame</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *coder</code></em>,
  58                                                          <em class="parameter"><code><span class="type">int</span> frame_number</code></em>);
  59 <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="returnvalue">GstVideoFrame</span></a> *     <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-get-oldest-frame" title="gst_base_video_decoder_get_oldest_frame ()">gst_base_video_decoder_get_oldest_frame</a>
  60                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *coder</code></em>);
  61 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-add-to-frame" title="gst_base_video_decoder_add_to_frame ()">gst_base_video_decoder_add_to_frame</a> (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
  62                                                          <em class="parameter"><code><span class="type">int</span> n_bytes</code></em>);
  63 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-lost-sync" title="gst_base_video_decoder_lost_sync ()">gst_base_video_decoder_lost_sync</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  64 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-have-frame" title="gst_base_video_decoder_have_frame ()">gst_base_video_decoder_have_frame</a>   (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  65 <span class="returnvalue">void</span>                <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-set-sync-point" title="gst_base_video_decoder_set_sync_point ()">gst_base_video_decoder_set_sync_point</a>
  66                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  67 <a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-set-src-caps" title="gst_base_video_decoder_set_src_caps ()">gst_base_video_decoder_set_src_caps</a> (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  68 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> *         <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-alloc-src-buffer" title="gst_base_video_decoder_alloc_src_buffer ()">gst_base_video_decoder_alloc_src_buffer</a>
  69                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  70 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-alloc-src-frame" title="gst_base_video_decoder_alloc_src_frame ()">gst_base_video_decoder_alloc_src_frame</a>
  71                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
  72                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);
  73 <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="returnvalue">GstVideoState</span></a> *     <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-get-state" title="gst_base_video_decoder_get_state ()">gst_base_video_decoder_get_state</a>    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);
  74 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>    <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-get-max-decode-time" title="gst_base_video_decoder_get_max_decode_time ()">gst_base_video_decoder_get_max_decode_time</a>
  75                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
  76                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);
  77 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#gst-base-video-decoder-finish-frame" title="gst_base_video_decoder_finish_frame ()">gst_base_video_decoder_finish_frame</a> (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
  78                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);
  79 </pre>
  80 </div>
  81 <div class="refsect1">
  82 <a name="gst-plugins-bad-libs-GstBaseVideoDecoder.description"></a><h2>Description</h2>
  83 <p>
  84 This base class is for video decoders turning encoded data into raw video
  85 frames.
  86 </p>
  87 <p>
  88 GstBaseVideoDecoder and subclass should cooperate as follows.
  89 </p>
  90 <div class="orderedlist"><ol class="orderedlist" type="1">
  91 <li class="listitem"><div class="itemizedlist">
  92 <p class="title"><b>Configuration</b></p>
  93 <ul class="itemizedlist" type="disc">
  94 <li class="listitem"><p>
  95     Initially, GstBaseVideoDecoder calls <em class="parameter"><code>start</code></em> when the decoder element
  96     is activated, which allows subclass to perform any global setup.
  97   </p></li>
  98 <li class="listitem"><p>
  99     GstBaseVideoDecoder calls <em class="parameter"><code>set_format</code></em> to inform subclass of caps
 100     describing input video data that it is about to receive, including
 101     possibly configuration data.
 102     While unlikely, it might be called more than once, if changing input
 103     parameters require reconfiguration.
 104   </p></li>
 105 <li class="listitem"><p>
 106     GstBaseVideoDecoder calls <em class="parameter"><code>stop</code></em> at end of all processing.
 107   </p></li>
 108 </ul>
 109 </div></li>
 110 <li class="listitem"><div class="itemizedlist">
 111 <p class="title"><b>Data processing</b></p>
 112 <ul class="itemizedlist" type="disc">
 113 <li class="listitem"><p>
 114       Base class gathers input data, and optionally allows subclass
 115       to parse this into subsequently manageable chunks, typically
 116       corresponding to and referred to as 'frames'.
 117     </p></li>
 118 <li class="listitem"><p>
 119       Input frame is provided to subclass' <em class="parameter"><code>handle_frame</code></em>.
 120     </p></li>
 121 <li class="listitem"><p>
 122       If codec processing results in decoded data, subclass should call
 123       <em class="parameter"><code>gst_base_video_decoder_finish_frame</code></em> to have decoded data pushed
 124       downstream.
 125     </p></li>
 126 </ul>
 127 </div></li>
 128 <li class="listitem"><div class="itemizedlist">
 129 <p class="title"><b>Shutdown phase</b></p>
 130 <ul class="itemizedlist" type="disc"><li class="listitem"><p>
 131     GstBaseVideoDecoder class calls <em class="parameter"><code>stop</code></em> to inform the subclass that data
 132     parsing will be stopped.
 133   </p></li></ul>
 134 </div></li>
 135 </ol></div>
 136 <p>
 137 </p>
 138 <p>
 139 Subclass is responsible for providing pad template caps for
 140 source and sink pads. The pads need to be named "sink" and "src". It also
 141 needs to set the fixed caps on srcpad, when the format is ensured.  This
 142 is typically when base class calls subclass' <em class="parameter"><code>set_format</code></em> function, though
 143 it might be delayed until calling <em class="parameter"><code>gst_base_video_decoder_finish_frame</code></em>.
 144 </p>
 145 <p>
 146 Subclass is also responsible for providing (presentation) timestamps
 147 (likely based on corresponding input ones).  If that is not applicable
 148 or possible, baseclass provides limited framerate based interpolation.
 149 </p>
 150 <p>
 151 Similarly, the baseclass provides some limited (legacy) seeking support
 152 (upon explicit subclass request), as full-fledged support
 153 should rather be left to upstream demuxer, parser or alike.  This simple
 154 approach caters for seeking and duration reporting using estimated input
 155 bitrates.
 156 </p>
 157 <p>
 158 Baseclass provides some support for reverse playback, in particular
 159 in case incoming data is not packetized or upstream does not provide
 160 fragments on keyframe boundaries.  However, subclass should then be prepared
 161 for the parsing and frame processing stage to occur separately (rather
 162 than otherwise the latter immediately following the former),
 163 and should ensure the parsing stage properly marks keyframes or rely on
 164 upstream to do so properly for incoming data.
 165 </p>
 166 <p>
 167 Things that subclass need to take care of:
 168 </p>
 169 <div class="itemizedlist"><ul class="itemizedlist" type="disc">
 170 <li class="listitem"><p>Provide pad templates</p></li>
 171 <li class="listitem"><p>
 172      Set source pad caps when appropriate
 173   </p></li>
 174 <li class="listitem"><p>
 175      Configure some baseclass behaviour parameters.
 176   </p></li>
 177 <li class="listitem"><p>
 178      Optionally parse input data, if it is not considered packetized.
 179      Parse sync is obtained either by providing baseclass with a
 180      mask and pattern or a custom <em class="parameter"><code>scan_for_sync</code></em>.  When sync is established,
 181      <em class="parameter"><code>parse_data</code></em> should invoke <em class="parameter"><code>gst_base_video_decoder_add_to_frame</code></em> and
 182      <em class="parameter"><code>gst_base_video_decoder_have_frame</code></em> as appropriate.
 183   </p></li>
 184 <li class="listitem"><p>
 185      Accept data in <em class="parameter"><code>handle_frame</code></em> and provide decoded results to
 186      <em class="parameter"><code>gst_base_video_decoder_finish_frame</code></em>.
 187   </p></li>
 188 </ul></div>
 189 <p>
 190 </p>
 191 </div>
 192 <div class="refsect1">
 193 <a name="gst-plugins-bad-libs-GstBaseVideoDecoder.details"></a><h2>Details</h2>
 194 <div class="refsect2">
 195 <a name="GST-BASE-VIDEO-DECODER-SINK-NAME:CAPS"></a><h3>GST_BASE_VIDEO_DECODER_SINK_NAME</h3>
 196 <pre class="programlisting">#define GST_BASE_VIDEO_DECODER_SINK_NAME    "sink"
 197 </pre>
 198 <p>
 199 The name of the templates for the sink pad.
 200 </p>
 201 </div>
 202 <hr>
 203 <div class="refsect2">
 204 <a name="GST-BASE-VIDEO-DECODER-SRC-NAME:CAPS"></a><h3>GST_BASE_VIDEO_DECODER_SRC_NAME</h3>
 205 <pre class="programlisting">#define GST_BASE_VIDEO_DECODER_SRC_NAME     "src"
 206 </pre>
 207 <p>
 208 The name of the templates for the source pad.
 209 </p>
 210 </div>
 211 <hr>
 212 <div class="refsect2">
 213 <a name="GST-BASE-VIDEO-DECODER-FLOW-NEED-DATA:CAPS"></a><h3>GST_BASE_VIDEO_DECODER_FLOW_NEED_DATA</h3>
 214 <pre class="programlisting">#define GST_BASE_VIDEO_DECODER_FLOW_NEED_DATA GST_FLOW_CUSTOM_SUCCESS
 215 </pre>
 216 <p>
 217 Returned while parsing to indicate more data is needed.
 218 </p>
 219 </div>
 220 <hr>
 221 <div class="refsect2">
 222 <a name="GST-BASE-VIDEO-DECODER-FLOW-DROPPED:CAPS"></a><h3>GST_BASE_VIDEO_DECODER_FLOW_DROPPED</h3>
 223 <pre class="programlisting">#define GST_BASE_VIDEO_DECODER_FLOW_DROPPED GST_FLOW_CUSTOM_SUCCESS_1
 224 </pre>
 225 <p>
 226 Returned when the event/buffer should be dropped.
 227 </p>
 228 </div>
 229 <hr>
 230 <div class="refsect2">
 231 <a name="GST-BASE-AUDIO-DECODER-ERROR:CAPS"></a><h3>GST_BASE_AUDIO_DECODER_ERROR()</h3>
 232 <pre class="programlisting">#define             GST_BASE_AUDIO_DECODER_ERROR(el, w, domain, code, text, debug, ret)</pre>
 233 </div>
 234 <hr>
 235 <div class="refsect2">
 236 <a name="GstBaseVideoDecoder"></a><h3>struct GstBaseVideoDecoder</h3>
 237 <pre class="programlisting">struct GstBaseVideoDecoder {
 238   GstBaseVideoCodec base_video_codec;
 239 };
 240 </pre>
 241 <p>
 242 The opaque <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> data structure.
 243 </p>
 244 </div>
 245 <hr>
 246 <div class="refsect2">
 247 <a name="GstBaseVideoDecoderClass"></a><h3>struct GstBaseVideoDecoderClass</h3>
 248 <pre class="programlisting">struct GstBaseVideoDecoderClass {
 249   GstBaseVideoCodecClass base_video_codec_class;
 250
 251   gboolean      (*start)          (GstBaseVideoDecoder *coder);
 252
 253   gboolean      (*stop)           (GstBaseVideoDecoder *coder);
 254
 255   int           (*scan_for_sync)  (GstBaseVideoDecoder *decoder, gboolean at_eos,
 256                                    int offset, int n);
 257
 258   GstFlowReturn (*parse_data)     (GstBaseVideoDecoder *decoder, gboolean at_eos);
 259
 260   gboolean      (*set_format)     (GstBaseVideoDecoder *coder, GstVideoState * state);
 261
 262   gboolean      (*reset)          (GstBaseVideoDecoder *coder);
 263
 264   GstFlowReturn (*finish)         (GstBaseVideoDecoder *coder);
 265
 266   GstFlowReturn (*handle_frame)   (GstBaseVideoDecoder *coder, GstVideoFrame *frame);
 267 };
 268 </pre>
 269 <p>
 270 Subclasses can override any of the available virtual methods or not, as
 271 needed. At minimum <em class="parameter"><code>handle_frame</code></em> needs to be overridden, and <em class="parameter"><code>set_format</code></em>
 272 and likely as well.  If non-packetized input is supported or expected,
 273 <em class="parameter"><code>parse</code></em> needs to be overridden as well.
 274 </p>
 275 <div class="variablelist"><table border="0">
 276 <col align="left" valign="top">
 277 <tbody>
 278 <tr>
 279 <td><p><span class="term"><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstBaseVideoCodecClass" title="struct GstBaseVideoCodecClass"><span class="type">GstBaseVideoCodecClass</span></a> <em class="structfield"><code><a name="GstBaseVideoDecoderClass.base-video-codec-class"></a>base_video_codec_class</code></em>;</span></p></td>
 280 <td></td>
 281 </tr>
 282 <tr>
 283 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.start"></a>start</code></em> ()</span></p></td>
 284 <td>Optional.
 285 Called when the element starts processing.
 286 Allows opening external resources.</td>
 287 </tr>
 288 <tr>
 289 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.stop"></a>stop</code></em> ()</span></p></td>
 290 <td>Optional.
 291 Called when the element stops processing.
 292 Allows closing external resources.</td>
 293 </tr>
 294 <tr>
 295 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.scan-for-sync"></a>scan_for_sync</code></em> ()</span></p></td>
 296 <td>Optional.
 297 Allows subclass to obtain sync for subsequent parsing
 298 by custom means (above an beyond scanning for specific
 299 marker and mask).</td>
 300 </tr>
 301 <tr>
 302 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.parse-data"></a>parse_data</code></em> ()</span></p></td>
 303 <td>Required for non-packetized input.
 304 Allows chopping incoming data into manageable units (frames)
 305 for subsequent decoding.</td>
 306 </tr>
 307 <tr>
 308 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.set-format"></a>set_format</code></em> ()</span></p></td>
 309 <td>Notifies subclass of incoming data format (caps).</td>
 310 </tr>
 311 <tr>
 312 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.reset"></a>reset</code></em> ()</span></p></td>
 313 <td>Optional.
 314 Allows subclass (codec) to perform post-seek semantics reset.</td>
 315 </tr>
 316 <tr>
 317 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.finish"></a>finish</code></em> ()</span></p></td>
 318 <td>Optional.
 319 Called to request subclass to dispatch any pending remaining
 320 data (e.g. at EOS).</td>
 321 </tr>
 322 <tr>
 323 <td><p><span class="term"><em class="structfield"><code><a name="GstBaseVideoDecoderClass.handle-frame"></a>handle_frame</code></em> ()</span></p></td>
 324 <td>Provides input data frame to subclass.</td>
 325 </tr>
 326 </tbody>
 327 </table></div>
 328 </div>
 329 <hr>
 330 <div class="refsect2">
 331 <a name="gst-base-video-decoder-class-set-capture-pattern"></a><h3>gst_base_video_decoder_class_set_capture_pattern ()</h3>
 332 <pre class="programlisting"><span class="returnvalue">void</span>                gst_base_video_decoder_class_set_capture_pattern
 333                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoderClass" title="struct GstBaseVideoDecoderClass"><span class="type">GstBaseVideoDecoderClass</span></a> *klass</code></em>,
 334                                                          <em class="parameter"><code><span class="type">guint32</span> mask</code></em>,
 335                                                          <em class="parameter"><code><span class="type">guint32</span> pattern</code></em>);</pre>
 336 </div>
 337 <hr>
 338 <div class="refsect2">
 339 <a name="gst-base-video-decoder-get-frame"></a><h3>gst_base_video_decoder_get_frame ()</h3>
 340 <pre class="programlisting"><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="returnvalue">GstVideoFrame</span></a> *     gst_base_video_decoder_get_frame    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *coder</code></em>,
 341                                                          <em class="parameter"><code><span class="type">int</span> frame_number</code></em>);</pre>
 342 <div class="variablelist"><table border="0">
 343 <col align="left" valign="top">
 344 <tbody>
 345 <tr>
 346 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 347 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 348 </td>
 349 </tr>
 350 <tr>
 351 <td><p><span class="term"><em class="parameter"><code>frame_number</code></em> :</span></p></td>
 352 <td>system_frame_number of a frame</td>
 353 </tr>
 354 <tr>
 355 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 356 <td>pending unfinished <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> identified by <em class="parameter"><code>frame_number</code></em>.</td>
 357 </tr>
 358 </tbody>
 359 </table></div>
 360 </div>
 361 <hr>
 362 <div class="refsect2">
 363 <a name="gst-base-video-decoder-get-oldest-frame"></a><h3>gst_base_video_decoder_get_oldest_frame ()</h3>
 364 <pre class="programlisting"><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="returnvalue">GstVideoFrame</span></a> *     gst_base_video_decoder_get_oldest_frame
 365                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *coder</code></em>);</pre>
 366 <p>
 367 Sets the mask and pattern that will be scanned for to obtain parse sync.
 368 Note that a non-zero <em class="parameter"><code>mask</code></em> implies that <em class="parameter"><code>scan_for_sync</code></em> will be ignored.
 369 </p>
 370 <div class="variablelist"><table border="0">
 371 <col align="left" valign="top">
 372 <tbody><tr>
 373 <td><p><span class="term"><em class="parameter"><code>base_video_decoder_class</code></em> :</span></p></td>
 374 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoderClass" title="struct GstBaseVideoDecoderClass"><span class="type">GstBaseVideoDecoderClass</span></a>
 375 </td>
 376 </tr></tbody>
 377 </table></div>
 378 </div>
 379 <hr>
 380 <div class="refsect2">
 381 <a name="gst-base-video-decoder-add-to-frame"></a><h3>gst_base_video_decoder_add_to_frame ()</h3>
 382 <pre class="programlisting"><span class="returnvalue">void</span>                gst_base_video_decoder_add_to_frame (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
 383                                                          <em class="parameter"><code><span class="type">int</span> n_bytes</code></em>);</pre>
 384 </div>
 385 <hr>
 386 <div class="refsect2">
 387 <a name="gst-base-video-decoder-lost-sync"></a><h3>gst_base_video_decoder_lost_sync ()</h3>
 388 <pre class="programlisting"><span class="returnvalue">void</span>                gst_base_video_decoder_lost_sync    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 389 <p>
 390 Advances out-of-sync input data by 1 byte and marks it accordingly.
 391 </p>
 392 <div class="variablelist"><table border="0">
 393 <col align="left" valign="top">
 394 <tbody><tr>
 395 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 396 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 397 </td>
 398 </tr></tbody>
 399 </table></div>
 400 </div>
 401 <hr>
 402 <div class="refsect2">
 403 <a name="gst-base-video-decoder-have-frame"></a><h3>gst_base_video_decoder_have_frame ()</h3>
 404 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_base_video_decoder_have_frame   (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 405 <p>
 406 Gathers all data collected for currently parsed frame, gathers corresponding
 407 metadata and passes it along for further processing, i.e. <em class="parameter"><code>handle_frame</code></em>.
 408 </p>
 409 <div class="variablelist"><table border="0">
 410 <col align="left" valign="top">
 411 <tbody>
 412 <tr>
 413 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 414 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 415 </td>
 416 </tr>
 417 <tr>
 418 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 419 <td>a <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="type">GstFlowReturn</span></a>
 420 </td>
 421 </tr>
 422 </tbody>
 423 </table></div>
 424 </div>
 425 <hr>
 426 <div class="refsect2">
 427 <a name="gst-base-video-decoder-set-sync-point"></a><h3>gst_base_video_decoder_set_sync_point ()</h3>
 428 <pre class="programlisting"><span class="returnvalue">void</span>                gst_base_video_decoder_set_sync_point
 429                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 430 <p>
 431 Marks current frame as a sync point, i.e. keyframe.
 432 </p>
 433 <div class="variablelist"><table border="0">
 434 <col align="left" valign="top">
 435 <tbody><tr>
 436 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 437 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 438 </td>
 439 </tr></tbody>
 440 </table></div>
 441 </div>
 442 <hr>
 443 <div class="refsect2">
 444 <a name="gst-base-video-decoder-set-src-caps"></a><h3>gst_base_video_decoder_set_src_caps ()</h3>
 445 <pre class="programlisting"><a href="http://library.gnome.org/devel/glib/unstable/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>            gst_base_video_decoder_set_src_caps (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 446 <p>
 447 Sets src pad caps according to currently configured <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="type">GstVideoState</span></a>.
 448 </p>
 449 <div class="variablelist"><table border="0">
 450 <col align="left" valign="top">
 451 <tbody><tr>
 452 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 453 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 454 </td>
 455 </tr></tbody>
 456 </table></div>
 457 </div>
 458 <hr>
 459 <div class="refsect2">
 460 <a name="gst-base-video-decoder-alloc-src-buffer"></a><h3>gst_base_video_decoder_alloc_src_buffer ()</h3>
 461 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/gstreamer-GstBuffer.html#GstBuffer"><span class="returnvalue">GstBuffer</span></a> *         gst_base_video_decoder_alloc_src_buffer
 462                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 463 <p>
 464 Helper function that uses gst_pad_alloc_buffer_and_set_caps
 465 to allocate a buffer to hold a video frame for <em class="parameter"><code>base_video_decoder</code></em>'s
 466 current <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="type">GstVideoState</span></a>.
 467 </p>
 468 <div class="variablelist"><table border="0">
 469 <col align="left" valign="top">
 470 <tbody>
 471 <tr>
 472 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 473 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 474 </td>
 475 </tr>
 476 <tr>
 477 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 478 <td>allocated buffer</td>
 479 </tr>
 480 </tbody>
 481 </table></div>
 482 </div>
 483 <hr>
 484 <div class="refsect2">
 485 <a name="gst-base-video-decoder-alloc-src-frame"></a><h3>gst_base_video_decoder_alloc_src_frame ()</h3>
 486 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_base_video_decoder_alloc_src_frame
 487                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
 488                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);</pre>
 489 <p>
 490 Helper function that uses gst_pad_alloc_buffer_and_set_caps
 491 to allocate a buffer to hold a video frame for <em class="parameter"><code>base_video_decoder</code></em>'s
 492 current <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="type">GstVideoState</span></a>.  Subclass should already have configured video state
 493 and set src pad caps.
 494 </p>
 495 <div class="variablelist"><table border="0">
 496 <col align="left" valign="top">
 497 <tbody>
 498 <tr>
 499 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 500 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 501 </td>
 502 </tr>
 503 <tr>
 504 <td><p><span class="term"><em class="parameter"><code>frame</code></em> :</span></p></td>
 505 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a>
 506 </td>
 507 </tr>
 508 <tr>
 509 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 510 <td>result from pad alloc call</td>
 511 </tr>
 512 </tbody>
 513 </table></div>
 514 </div>
 515 <hr>
 516 <div class="refsect2">
 517 <a name="gst-base-video-decoder-get-state"></a><h3>gst_base_video_decoder_get_state ()</h3>
 518 <pre class="programlisting"><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="returnvalue">GstVideoState</span></a> *     gst_base_video_decoder_get_state    (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>);</pre>
 519 <div class="variablelist"><table border="0">
 520 <col align="left" valign="top">
 521 <tbody>
 522 <tr>
 523 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 524 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 525 </td>
 526 </tr>
 527 <tr>
 528 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 529 <td>
 530 <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoState" title="struct GstVideoState"><span class="type">GstVideoState</span></a> describing format of video data.</td>
 531 </tr>
 532 </tbody>
 533 </table></div>
 534 </div>
 535 <hr>
 536 <div class="refsect2">
 537 <a name="gst-base-video-decoder-get-max-decode-time"></a><h3>gst_base_video_decoder_get_max_decode_time ()</h3>
 538 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstClock.html#GstClockTimeDiff"><span class="returnvalue">GstClockTimeDiff</span></a>    gst_base_video_decoder_get_max_decode_time
 539                                                         (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
 540                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);</pre>
 541 <p>
 542 Determines maximum possible decoding time for <em class="parameter"><code>frame</code></em> that will
 543 allow it to decode and arrive in time (as determined by QoS events).
 544 In particular, a negative result means decoding in time is no longer possible
 545 and should therefore occur as soon/skippy as possible.
 546 </p>
 547 <div class="variablelist"><table border="0">
 548 <col align="left" valign="top">
 549 <tbody>
 550 <tr>
 551 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 552 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 553 </td>
 554 </tr>
 555 <tr>
 556 <td><p><span class="term"><em class="parameter"><code>frame</code></em> :</span></p></td>
 557 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a>
 558 </td>
 559 </tr>
 560 <tr>
 561 <td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
 562 <td>max decoding time.</td>
 563 </tr>
 564 </tbody>
 565 </table></div>
 566 </div>
 567 <hr>
 568 <div class="refsect2">
 569 <a name="gst-base-video-decoder-finish-frame"></a><h3>gst_base_video_decoder_finish_frame ()</h3>
 570 <pre class="programlisting"><a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer/html/GstPad.html#GstFlowReturn"><span class="returnvalue">GstFlowReturn</span></a>       gst_base_video_decoder_finish_frame (<em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a> *base_video_decoder</code></em>,
 571                                                          <em class="parameter"><code><a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a> *frame</code></em>);</pre>
 572 <p>
 573 Removes next <em class="parameter"><code>n_bytes</code></em> of input data and adds it to currently parsed frame.
 574 </p>
 575 <div class="variablelist"><table border="0">
 576 <col align="left" valign="top">
 577 <tbody>
 578 <tr>
 579 <td><p><span class="term"><em class="parameter"><code>base_video_decoder</code></em> :</span></p></td>
 580 <td>a <a class="link" href="gst-plugins-bad-libs-GstBaseVideoDecoder.html#GstBaseVideoDecoder" title="struct GstBaseVideoDecoder"><span class="type">GstBaseVideoDecoder</span></a>
 581 </td>
 582 </tr>
 583 <tr>
 584 <td><p><span class="term"><em class="parameter"><code>n_bytes</code></em> :</span></p></td>
 585 <td>an encoded <a class="link" href="gst-plugins-bad-libs-GstBaseVideoCodec.html#GstVideoFrame" title="struct GstVideoFrame"><span class="type">GstVideoFrame</span></a>
 586 </td>
 587 </tr>
 588 </tbody>
 589 </table></div>
 590 </div>
 591 </div>
 592 <div class="refsect1">
 593 <a name="gst-plugins-bad-libs-GstBaseVideoDecoder.see-also"></a><h2>See Also</h2>
 594 <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseTransform.html"><span class="type">GstBaseTransform</span></a>
 595 </div>
 596 </div>
 597 <div class="footer">
 598 <hr>
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