This file is indexed.

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

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>appsink: GStreamer Base Plugins 1.0 Library Reference Manual</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
<link rel="home" href="index.html" title="GStreamer Base Plugins 1.0 Library Reference Manual">
<link rel="up" href="gstreamer-app.html" title="App Library">
<link rel="prev" href="gst-plugins-base-libs-appsrc.html" title="appsrc">
<link rel="next" href="gstreamer-audio.html" title="Audio Library">
<meta name="generator" content="GTK-Doc V1.24 (XML mode)">
<link rel="stylesheet" href="style.css" type="text/css">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle">
<td width="100%" align="left" class="shortcuts">
<a href="#" class="shortcut">Top</a><span id="nav_description">  <span class="dim">|</span> 
                  <a href="#gst-plugins-base-libs-appsink.description" class="shortcut">Description</a></span>
</td>
<td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td>
<td><a accesskey="u" href="gstreamer-app.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td>
<td><a accesskey="p" href="gst-plugins-base-libs-appsrc.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td>
<td><a accesskey="n" href="gstreamer-audio.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td>
</tr></table>
<div class="refentry">
<a name="gst-plugins-base-libs-appsink"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="gst-plugins-base-libs-appsink.top_of_page"></a>appsink</span></h2>
<p>appsink — Easy way for applications to extract samples from a
    pipeline</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-set-caps" title="gst_app_sink_set_caps ()">gst_app_sink_set_caps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-get-caps" title="gst_app_sink_get_caps ()">gst_app_sink_get_caps</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-is-eos" title="gst_app_sink_is_eos ()">gst_app_sink_is_eos</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-appsink.html#gst-app-sink-set-emit-signals" title="gst_app_sink_set_emit_signals ()">gst_app_sink_set_emit_signals</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-get-emit-signals" title="gst_app_sink_get_emit_signals ()">gst_app_sink_get_emit_signals</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-appsink.html#gst-app-sink-set-max-buffers" title="gst_app_sink_set_max_buffers ()">gst_app_sink_set_max_buffers</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-get-max-buffers" title="gst_app_sink_get_max_buffers ()">gst_app_sink_get_max_buffers</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-appsink.html#gst-app-sink-set-drop" title="gst_app_sink_set_drop ()">gst_app_sink_set_drop</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-get-drop" title="gst_app_sink_get_drop ()">gst_app_sink_get_drop</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="returnvalue">GstSample</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-preroll" title="gst_app_sink_pull_preroll ()">gst_app_sink_pull_preroll</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="returnvalue">GstSample</span></a> *
</td>
<td class="function_name">
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-sample" title="gst_app_sink_pull_sample ()">gst_app_sink_pull_sample</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-appsink.html#gst-app-sink-set-callbacks" title="gst_app_sink_set_callbacks ()">gst_app_sink_set_callbacks</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody><tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="gst-plugins-base-libs-appsink.html#GstAppSinkCallbacks" title="GstAppSinkCallbacks">GstAppSinkCallbacks</a></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/app/gstappsink.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.description"></a><h2>Description</h2>
<p>Appsink is a sink plugin that supports many different methods for making
the application get a handle on the GStreamer data in a pipeline. Unlike
most GStreamer elements, Appsink provides external API functions.</p>
<p>appsink can be used by linking to the gstappsink.h header file to access the
methods or by using the appsink action signals and properties.</p>
<p>The normal way of retrieving samples from appsink is by using the
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-sample" title="gst_app_sink_pull_sample ()"><code class="function">gst_app_sink_pull_sample()</code></a> and <a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-preroll" title="gst_app_sink_pull_preroll ()"><code class="function">gst_app_sink_pull_preroll()</code></a> methods.
These methods block until a sample becomes available in the sink or when the
sink is shut down or reaches EOS.</p>
<p>Appsink will internally use a queue to collect buffers from the streaming
thread. If the application is not pulling samples fast enough, this queue
will consume a lot of memory over time. The "max-buffers" property can be
used to limit the queue size. The "drop" property controls whether the
streaming thread blocks or if older buffers are dropped when the maximum
queue size is reached. Note that blocking the streaming thread can negatively
affect real-time performance and should be avoided.</p>
<p>If a blocking behaviour is not desirable, setting the "emit-signals" property
to <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> will make appsink emit the "new-sample" and "new-preroll" signals
when a sample can be pulled without blocking.</p>
<p>The "caps" property on appsink can be used to control the formats that
appsink can receive. This property can contain non-fixed caps, the format of
the pulled samples can be obtained by getting the sample caps.</p>
<p>If one of the pull-preroll or pull-sample methods return <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>, the appsink
is stopped or in the EOS state. You can check for the EOS state with the
"eos" property or with the <a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-is-eos" title="gst_app_sink_is_eos ()"><code class="function">gst_app_sink_is_eos()</code></a> method.</p>
<p>The eos signal can also be used to be informed when the EOS state is reached
to avoid polling.</p>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-app-sink-set-caps"></a><h3>gst_app_sink_set_caps ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_sink_set_caps (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>,
                       <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>Set the capabilities on the appsink element.  This function takes
a copy of the caps structure. After calling this method, the sink will only
accept caps that match <em class="parameter"><code>caps</code></em>
. If <em class="parameter"><code>caps</code></em>
 is non-fixed, or incomplete,
you must check the caps on the samples to get the actual used caps.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.2.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>caps to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-get-caps"></a><h3>gst_app_sink_get_caps ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="returnvalue">GstCaps</span></a> *
gst_app_sink_get_caps (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Get the configured caps on <em class="parameter"><code>appsink</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.3.6"></a><h4>Returns</h4>
<p> the <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html"><span class="type">GstCaps</span></a> accepted by the sink. <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstCaps.html#gst-caps-unref"><code class="function">gst_caps_unref()</code></a> after usage.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-is-eos"></a><h3>gst_app_sink_is_eos ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_app_sink_is_eos (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Check if <em class="parameter"><code>appsink</code></em>
 is EOS, which is when no more samples can be pulled because
an EOS event was received.</p>
<p>This function also returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when the appsink is not in the PAUSED or
PLAYING state.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.4.6"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.4.7"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if no more samples can be pulled and the appsink is EOS.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-set-emit-signals"></a><h3>gst_app_sink_set_emit_signals ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_sink_set_emit_signals (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>,
                               <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> emit</code></em>);</pre>
<p>Make appsink emit the "new-preroll" and "new-sample" signals. This option is
by default disabled because signal emission is expensive and unneeded when
the application prefers to operate in pull mode.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>emit</p></td>
<td class="parameter_description"><p>the new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-get-emit-signals"></a><h3>gst_app_sink_get_emit_signals ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_app_sink_get_emit_signals (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Check if appsink will emit the "new-preroll" and "new-sample" signals.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.6.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>appsink</code></em>
is emiting the "new-preroll" and "new-sample"
signals.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-set-max-buffers"></a><h3>gst_app_sink_set_max_buffers ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_sink_set_max_buffers (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>,
                              <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> max</code></em>);</pre>
<p>Set the maximum amount of buffers that can be queued in <em class="parameter"><code>appsink</code></em>
. After this
amount of buffers are queued in appsink, any more buffers will block upstream
elements until a sample is pulled from <em class="parameter"><code>appsink</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>max</p></td>
<td class="parameter_description"><p>the maximum number of buffers to queue</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-get-max-buffers"></a><h3>gst_app_sink_get_max_buffers ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_app_sink_get_max_buffers (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Get the maximum amount of buffers that can be queued in <em class="parameter"><code>appsink</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.8.6"></a><h4>Returns</h4>
<p> The maximum amount of buffers that can be queued.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-set-drop"></a><h3>gst_app_sink_set_drop ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_sink_set_drop (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>,
                       <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> drop</code></em>);</pre>
<p>Instruct <em class="parameter"><code>appsink</code></em>
 to drop old buffers when the maximum amount of queued
buffers is reached.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>drop</p></td>
<td class="parameter_description"><p>the new state</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-get-drop"></a><h3>gst_app_sink_get_drop ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_app_sink_get_drop (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Check if <em class="parameter"><code>appsink</code></em>
 will drop old buffers when the maximum amount of queued
buffers is reached.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.10.6"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if <em class="parameter"><code>appsink</code></em>
is dropping old buffers when the queue is
filled.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-app-sink-pull-preroll"></a><h3>gst_app_sink_pull_preroll ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="returnvalue">GstSample</span></a> *
gst_app_sink_pull_preroll (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>Get the last preroll sample in <em class="parameter"><code>appsink</code></em>
. This was the sample that caused the
appsink to preroll in the PAUSED state. This sample can be pulled many times
and remains available to the application even after EOS.</p>
<p>This function is typically used when dealing with a pipeline in the PAUSED
state. Calling this function after doing a seek will give the sample right
after the seek position.</p>
<p>Note that the preroll sample will also be returned as the first sample
when calling <a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-sample" title="gst_app_sink_pull_sample ()"><code class="function">gst_app_sink_pull_sample()</code></a>.</p>
<p>If an EOS event was received before any buffers, this function returns
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. Use <a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-is-eos" title="gst_app_sink_is_eos ()"><code class="function">gst_app_sink_is_eos()</code></a> to check for the EOS condition.</p>
<p>This function blocks until a preroll sample or EOS is received or the appsink
element is set to the READY/NULL state.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.11.9"></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>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.11.10"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="type">GstSample</span></a> or NULL when the appsink is stopped or EOS.
Call <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html#gst-sample-unref"><code class="function">gst_sample_unref()</code></a> after usage. </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-app-sink-pull-sample"></a><h3>gst_app_sink_pull_sample ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="returnvalue">GstSample</span></a> *
gst_app_sink_pull_sample (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>);</pre>
<p>This function blocks until a sample or EOS becomes available or the appsink
element is set to the READY/NULL state.</p>
<p>This function will only return samples when the appsink is in the PLAYING
state. All rendered buffers will be put in a queue so that the application
can pull samples at its own rate. Note that when the application does not
pull samples fast enough, the queued buffers could consume a lot of memory,
especially when dealing with raw video frames.</p>
<p>If an EOS event was received before any buffers, this function returns
<a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>. Use <a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-is-eos" title="gst_app_sink_is_eos ()"><code class="function">gst_app_sink_is_eos()</code></a> to check for the EOS condition.</p>
<div class="refsect3">
<a name="id-1.2.5.5.7.12.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.5.7.12.8"></a><h4>Returns</h4>
<p> a <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="type">GstSample</span></a> or NULL when the appsink is stopped or EOS.
Call <a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html#gst-sample-unref"><code class="function">gst_sample_unref()</code></a> after usage. </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-app-sink-set-callbacks"></a><h3>gst_app_sink_set_callbacks ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_app_sink_set_callbacks (<em class="parameter"><code><span class="type">GstAppSink</span> *appsink</code></em>,
                            <em class="parameter"><code><a class="link" href="gst-plugins-base-libs-appsink.html#GstAppSinkCallbacks" title="GstAppSinkCallbacks"><span class="type">GstAppSinkCallbacks</span></a> *callbacks</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>,
                            <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Datasets.html#GDestroyNotify"><span class="type">GDestroyNotify</span></a> notify</code></em>);</pre>
<p>Set callbacks which will be executed for each new preroll, new sample and eos.
This is an alternative to using the signals, it has lower overhead and is thus
less expensive, but also less flexible.</p>
<p>If callbacks are installed, no signals will be emitted for performance
reasons.</p>
<p><span class="annotation">[<acronym title="Exposed in C code, not necessarily available in other languages."><span class="acronym">skip</span></acronym>]</span></p>
<div class="refsect3">
<a name="id-1.2.5.5.7.13.7"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>appsink</p></td>
<td class="parameter_description"><p>a <span class="type">GstAppSink</span></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>callbacks</p></td>
<td class="parameter_description"><p>the callbacks</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>a user_data argument for the callbacks</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>notify</p></td>
<td class="parameter_description"><p>a destroy notify function</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstAppSinkCallbacks"></a><h3>GstAppSinkCallbacks</h3>
<pre class="programlisting">typedef struct {
  void          (*eos)              (GstAppSink *appsink, gpointer user_data);
  GstFlowReturn (*new_preroll)      (GstAppSink *appsink, gpointer user_data);
  GstFlowReturn (*new_sample)       (GstAppSink *appsink, gpointer user_data);
} GstAppSinkCallbacks;
</pre>
<p>A set of callbacks that can be installed on the appsink with
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-set-callbacks" title="gst_app_sink_set_callbacks ()"><code class="function">gst_app_sink_set_callbacks()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.5.8.2.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSinkCallbacks.eos"></a>eos</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when the end-of-stream has been reached. This callback
is called from the streaming thread.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSinkCallbacks.new-preroll"></a>new_preroll</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when a new preroll sample is available.
This callback is called from the streaming thread.
The new preroll sample can be retrieved with
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-preroll" title="gst_app_sink_pull_preroll ()"><code class="function">gst_app_sink_pull_preroll()</code></a> either from this callback
or from any other thread.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><em class="structfield"><code><a name="GstAppSinkCallbacks.new-sample"></a>new_sample</code></em> ()</p></td>
<td class="struct_member_description"><p>Called when a new sample is available.
This callback is called from the streaming thread.
The new sample can be retrieved with
<a class="link" href="gst-plugins-base-libs-appsink.html#gst-app-sink-pull-sample" title="gst_app_sink_pull_sample ()"><code class="function">gst_app_sink_pull_sample()</code></a> either from this callback
or from any other thread.</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="gst-plugins-base-libs-appsink.see-also"></a><h2>See Also</h2>
<p><a href="/usr/share/gtk-doc/html/gstreamer-1.0/GstSample.html"><span class="type">GstSample</span></a>, <a href="/usr/share/gtk-doc/html/gstreamer-libs-1.0/GstBaseSink.html"><span class="type">GstBaseSink</span></a>, appsrc</p>
</div>
</div>
<div class="footer">
<hr>Generated by GTK-Doc V1.24</div>
</body>
</html>