1 /*
2 * RTP Demux element
3 *
4 * Copyright (C) 2005 Nokia Corporation.
5 * @author Kai Vehmanen <kai.vehmanen@nokia.com>
6 *
7 * Loosely based on GStreamer gstdecodebin
8 * Copyright (C) <2004> Wim Taymans <wim.taymans@gmail.com>
9 *
10 * This library is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Library General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This library is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Library General Public License for more details.
19 *
20 * You should have received a copy of the GNU Library General Public
21 * License along with this library; if not, write to the
22 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
23 * Boston, MA 02110-1301, USA.
24 */
25
26 /**
27 * SECTION:element-rtpptdemux
28 *
29 * rtpptdemux acts as a demuxer for RTP packets based on the payload type of
30 * the packets. Its main purpose is to allow an application to easily receive
31 * and decode an RTP stream with multiple payload types.
32 *
33 * For each payload type that is detected, a new pad will be created and the
34 * #GstRtpPtDemux::new-payload-type signal will be emitted. When the payload for
35 * the RTP stream changes, the #GstRtpPtDemux::payload-type-change signal will be
36 * emitted.
37 *
38 * The element will try to set complete and unique application/x-rtp caps
39 * on the output pads based on the result of the #GstRtpPtDemux::request-pt-map
40 * signal.
41 *
42 * <refsect2>
43 * <title>Example pipelines</title>
44 * |[
45 * gst-launch-1.0 udpsrc caps="application/x-rtp" ! rtpptdemux ! fakesink
46 * ]| Takes an RTP stream and send the RTP packets with the first detected
47 * payload type to fakesink, discarding the other payload types.
48 * </refsect2>
49 */
50
51 /*
52 * Contributors:
53 * Andre Moreira Magalhaes <andre.magalhaes@indt.org.br>
54 */
55 /*
56 * Status:
57 * - works with the test_rtpdemux.c tool
58 *
59 * Check:
60 * - is emitting a signal enough, or should we
61 * use GstEvent to notify downstream elements
62 * of the new packet... no?
63 *
64 * Notes:
65 * - emits event both for new PTs, and whenever
66 * a PT is changed
67 */
68
69 #ifdef HAVE_CONFIG_H
70 #include "config.h"
71 #endif
72
73 #include <string.h>
74 #include <gst/gst.h>
75 #include <gst/rtp/gstrtpbuffer.h>
76
77 #include "gstrtpptdemux.h"
78
79 /* generic templates */
80 static GstStaticPadTemplate rtp_pt_demux_sink_template =
81 GST_STATIC_PAD_TEMPLATE ("sink",
82 GST_PAD_SINK,
83 GST_PAD_ALWAYS,
84 GST_STATIC_CAPS ("application/x-rtp")
85 );
86
87 static GstStaticPadTemplate rtp_pt_demux_src_template =
88 GST_STATIC_PAD_TEMPLATE ("src_%u",
89 GST_PAD_SRC,
90 GST_PAD_SOMETIMES,
91 GST_STATIC_CAPS ("application/x-rtp, " "payload = (int) [ 0, 255 ]")
92 );
93
94 GST_DEBUG_CATEGORY_STATIC (gst_rtp_pt_demux_debug);
95 #define GST_CAT_DEFAULT gst_rtp_pt_demux_debug
96
97 /*
98 * Item for storing GstPad<->pt pairs.
99 */
100 struct _GstRtpPtDemuxPad
101 {
102 GstPad *pad; /**< pointer to the actual pad */
103 gint pt; /**< RTP payload-type attached to pad */
104 gboolean newcaps;
105 };
106
107 /* signals */
108 enum
109 {
110 SIGNAL_REQUEST_PT_MAP,
111 SIGNAL_NEW_PAYLOAD_TYPE,
112 SIGNAL_PAYLOAD_TYPE_CHANGE,
113 SIGNAL_CLEAR_PT_MAP,
114 LAST_SIGNAL
115 };
116
117 enum
118 {
119 PROP_0,
120 PROP_IGNORED_PTS,
121 };
122
123 #define gst_rtp_pt_demux_parent_class parent_class
124 G_DEFINE_TYPE (GstRtpPtDemux, gst_rtp_pt_demux, GST_TYPE_ELEMENT);
125
126 static void gst_rtp_pt_demux_finalize (GObject * object);
127
128 static void gst_rtp_pt_demux_release (GstRtpPtDemux * ptdemux);
129 static gboolean gst_rtp_pt_demux_setup (GstRtpPtDemux * ptdemux);
130
131 static gboolean gst_rtp_pt_demux_sink_event (GstPad * pad, GstObject * parent,
132 GstEvent * event);
133 static GstFlowReturn gst_rtp_pt_demux_chain (GstPad * pad, GstObject * parent,
134 GstBuffer * buf);
135 static GstStateChangeReturn gst_rtp_pt_demux_change_state (GstElement * element,
136 GstStateChange transition);
137 static void gst_rtp_pt_demux_clear_pt_map (GstRtpPtDemux * rtpdemux);
138
139 static GstPad *find_pad_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt);
140
141 static gboolean gst_rtp_pt_demux_src_event (GstPad * pad, GstObject * parent,
142 GstEvent * event);
143
144
145 static guint gst_rtp_pt_demux_signals[LAST_SIGNAL] = { 0 };
146
147 static void
gst_rtp_pt_demux_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)148 gst_rtp_pt_demux_set_property (GObject * object, guint prop_id,
149 const GValue * value, GParamSpec * pspec)
150 {
151 GstRtpPtDemux *rtpptdemux = GST_RTP_PT_DEMUX (object);
152
153 switch (prop_id) {
154 case PROP_IGNORED_PTS:
155 g_value_copy (value, &rtpptdemux->ignored_pts);
156 break;
157 default:
158 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
159 break;
160 }
161 }
162
163 static void
gst_rtp_pt_demux_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)164 gst_rtp_pt_demux_get_property (GObject * object, guint prop_id,
165 GValue * value, GParamSpec * pspec)
166 {
167 GstRtpPtDemux *rtpptdemux = GST_RTP_PT_DEMUX (object);
168
169 switch (prop_id) {
170 case PROP_IGNORED_PTS:
171 g_value_copy (&rtpptdemux->ignored_pts, value);
172 break;
173 default:
174 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
175 break;
176 }
177 }
178
179 static void
gst_rtp_pt_demux_class_init(GstRtpPtDemuxClass * klass)180 gst_rtp_pt_demux_class_init (GstRtpPtDemuxClass * klass)
181 {
182 GObjectClass *gobject_klass;
183 GstElementClass *gstelement_klass;
184
185 gobject_klass = (GObjectClass *) klass;
186 gstelement_klass = (GstElementClass *) klass;
187
188 /**
189 * GstRtpPtDemux::request-pt-map:
190 * @demux: the object which received the signal
191 * @pt: the payload type
192 *
193 * Request the payload type as #GstCaps for @pt.
194 */
195 gst_rtp_pt_demux_signals[SIGNAL_REQUEST_PT_MAP] =
196 g_signal_new ("request-pt-map", G_TYPE_FROM_CLASS (klass),
197 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass, request_pt_map),
198 NULL, NULL, g_cclosure_marshal_generic, GST_TYPE_CAPS, 1, G_TYPE_UINT);
199
200 /**
201 * GstRtpPtDemux::new-payload-type:
202 * @demux: the object which received the signal
203 * @pt: the payload type
204 * @pad: the pad with the new payload
205 *
206 * Emited when a new payload type pad has been created in @demux.
207 */
208 gst_rtp_pt_demux_signals[SIGNAL_NEW_PAYLOAD_TYPE] =
209 g_signal_new ("new-payload-type", G_TYPE_FROM_CLASS (klass),
210 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass, new_payload_type),
211 NULL, NULL, g_cclosure_marshal_generic, G_TYPE_NONE, 2, G_TYPE_UINT,
212 GST_TYPE_PAD);
213
214 /**
215 * GstRtpPtDemux::payload-type-change:
216 * @demux: the object which received the signal
217 * @pt: the new payload type
218 *
219 * Emited when the payload type changed.
220 */
221 gst_rtp_pt_demux_signals[SIGNAL_PAYLOAD_TYPE_CHANGE] =
222 g_signal_new ("payload-type-change", G_TYPE_FROM_CLASS (klass),
223 G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass,
224 payload_type_change), NULL, NULL, g_cclosure_marshal_VOID__UINT,
225 G_TYPE_NONE, 1, G_TYPE_UINT);
226
227 /**
228 * GstRtpPtDemux::clear-pt-map:
229 * @demux: the object which received the signal
230 *
231 * The application can call this signal to instruct the element to discard the
232 * currently cached payload type map.
233 */
234 gst_rtp_pt_demux_signals[SIGNAL_CLEAR_PT_MAP] =
235 g_signal_new ("clear-pt-map", G_TYPE_FROM_CLASS (klass),
236 G_SIGNAL_ACTION | G_SIGNAL_RUN_LAST, G_STRUCT_OFFSET (GstRtpPtDemuxClass,
237 clear_pt_map), NULL, NULL, g_cclosure_marshal_VOID__VOID,
238 G_TYPE_NONE, 0, G_TYPE_NONE);
239
240 gobject_klass->set_property = gst_rtp_pt_demux_set_property;
241 gobject_klass->get_property = gst_rtp_pt_demux_get_property;
242
243 /**
244 * GstRtpPtDemux:ignored-payload-types:
245 *
246 * If specified, packets with an ignored payload type will be dropped,
247 * instead of causing a new pad to be exposed for these to be pushed on.
248 *
249 * This is for example useful to drop FEC protection packets, as they
250 * need to go through the #GstRtpJitterBuffer, but cease to be useful
251 * past that point, #GstRtpBin will make use of this property for that
252 * purpose.
253 *
254 * Since: 1.14
255 */
256 g_object_class_install_property (gobject_klass, PROP_IGNORED_PTS,
257 gst_param_spec_array ("ignored-payload-types",
258 "Ignored payload types",
259 "Packets with these payload types will be dropped",
260 g_param_spec_int ("payload-types", "payload-types", "Payload types",
261 0, G_MAXINT, 0,
262 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS),
263 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
264
265 gobject_klass->finalize = gst_rtp_pt_demux_finalize;
266
267 gstelement_klass->change_state =
268 GST_DEBUG_FUNCPTR (gst_rtp_pt_demux_change_state);
269
270 klass->clear_pt_map = GST_DEBUG_FUNCPTR (gst_rtp_pt_demux_clear_pt_map);
271
272 gst_element_class_add_static_pad_template (gstelement_klass,
273 &rtp_pt_demux_sink_template);
274 gst_element_class_add_static_pad_template (gstelement_klass,
275 &rtp_pt_demux_src_template);
276
277 gst_element_class_set_static_metadata (gstelement_klass, "RTP Demux",
278 "Demux/Network/RTP",
279 "Parses codec streams transmitted in the same RTP session",
280 "Kai Vehmanen <kai.vehmanen@nokia.com>");
281
282 GST_DEBUG_CATEGORY_INIT (gst_rtp_pt_demux_debug,
283 "rtpptdemux", 0, "RTP codec demuxer");
284
285 GST_DEBUG_REGISTER_FUNCPTR (gst_rtp_pt_demux_chain);
286 }
287
288 static void
gst_rtp_pt_demux_init(GstRtpPtDemux * ptdemux)289 gst_rtp_pt_demux_init (GstRtpPtDemux * ptdemux)
290 {
291 GstElementClass *klass = GST_ELEMENT_GET_CLASS (ptdemux);
292
293 ptdemux->sink =
294 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
295 "sink"), "sink");
296 g_assert (ptdemux->sink != NULL);
297
298 gst_pad_set_chain_function (ptdemux->sink, gst_rtp_pt_demux_chain);
299 gst_pad_set_event_function (ptdemux->sink, gst_rtp_pt_demux_sink_event);
300
301 gst_element_add_pad (GST_ELEMENT (ptdemux), ptdemux->sink);
302
303 g_value_init (&ptdemux->ignored_pts, GST_TYPE_ARRAY);
304 }
305
306 static void
gst_rtp_pt_demux_finalize(GObject * object)307 gst_rtp_pt_demux_finalize (GObject * object)
308 {
309 gst_rtp_pt_demux_release (GST_RTP_PT_DEMUX (object));
310
311 g_value_unset (&GST_RTP_PT_DEMUX (object)->ignored_pts);
312
313 G_OBJECT_CLASS (parent_class)->finalize (object);
314 }
315
316 static GstCaps *
gst_rtp_pt_demux_get_caps(GstRtpPtDemux * rtpdemux,guint pt)317 gst_rtp_pt_demux_get_caps (GstRtpPtDemux * rtpdemux, guint pt)
318 {
319 GstCaps *caps;
320 GValue ret = { 0 };
321 GValue args[2] = { {0}, {0} };
322 GstCaps *sink_caps;
323
324 /* figure out the caps */
325 g_value_init (&args[0], GST_TYPE_ELEMENT);
326 g_value_set_object (&args[0], rtpdemux);
327 g_value_init (&args[1], G_TYPE_UINT);
328 g_value_set_uint (&args[1], pt);
329
330 g_value_init (&ret, GST_TYPE_CAPS);
331 g_value_set_boxed (&ret, NULL);
332
333 g_signal_emitv (args, gst_rtp_pt_demux_signals[SIGNAL_REQUEST_PT_MAP], 0,
334 &ret);
335
336 g_value_unset (&args[0]);
337 g_value_unset (&args[1]);
338 caps = g_value_dup_boxed (&ret);
339 g_value_unset (&ret);
340
341 sink_caps = gst_pad_get_current_caps (rtpdemux->sink);
342
343 if (sink_caps) {
344 if (caps == NULL) {
345 caps = gst_caps_ref (sink_caps);
346 } else {
347 GstStructure *s1;
348 GstStructure *s2;
349 guint ssrc;
350
351 caps = gst_caps_make_writable (caps);
352 s1 = gst_caps_get_structure (sink_caps, 0);
353 s2 = gst_caps_get_structure (caps, 0);
354
355 gst_structure_get_uint (s1, "ssrc", &ssrc);
356 gst_structure_set (s2, "ssrc", G_TYPE_UINT, ssrc, NULL);
357 }
358
359 gst_caps_unref (sink_caps);
360 }
361
362 GST_DEBUG ("pt %d, got caps %" GST_PTR_FORMAT, pt, caps);
363
364 return caps;
365 }
366
367 static void
gst_rtp_pt_demux_clear_pt_map(GstRtpPtDemux * rtpdemux)368 gst_rtp_pt_demux_clear_pt_map (GstRtpPtDemux * rtpdemux)
369 {
370 GSList *walk;
371
372 GST_OBJECT_LOCK (rtpdemux);
373 GST_DEBUG ("clearing pt map");
374 for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
375 GstRtpPtDemuxPad *pad = walk->data;
376
377 pad->newcaps = TRUE;
378 }
379 GST_OBJECT_UNLOCK (rtpdemux);
380 }
381
382 static gboolean
need_caps_for_pt(GstRtpPtDemux * rtpdemux,guint8 pt)383 need_caps_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
384 {
385 GSList *walk;
386 gboolean ret = FALSE;
387
388 GST_OBJECT_LOCK (rtpdemux);
389 for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
390 GstRtpPtDemuxPad *pad = walk->data;
391
392 if (pad->pt == pt) {
393 ret = pad->newcaps;
394 }
395 }
396 GST_OBJECT_UNLOCK (rtpdemux);
397
398 return ret;
399 }
400
401
402 static void
clear_newcaps_for_pt(GstRtpPtDemux * rtpdemux,guint8 pt)403 clear_newcaps_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
404 {
405 GSList *walk;
406
407 GST_OBJECT_LOCK (rtpdemux);
408 for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
409 GstRtpPtDemuxPad *pad = walk->data;
410
411 if (pad->pt == pt) {
412 pad->newcaps = FALSE;
413 break;
414 }
415 }
416 GST_OBJECT_UNLOCK (rtpdemux);
417 }
418
419 static gboolean
forward_sticky_events(GstPad * pad,GstEvent ** event,gpointer user_data)420 forward_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
421 {
422 GstPad *srcpad = GST_PAD_CAST (user_data);
423
424 /* Stream start and caps have already been pushed */
425 if (GST_EVENT_TYPE (*event) >= GST_EVENT_SEGMENT)
426 gst_pad_push_event (srcpad, gst_event_ref (*event));
427
428 return TRUE;
429 }
430
431 static gboolean
gst_rtp_pt_demux_pt_is_ignored(GstRtpPtDemux * ptdemux,guint8 pt)432 gst_rtp_pt_demux_pt_is_ignored (GstRtpPtDemux * ptdemux, guint8 pt)
433 {
434 gboolean ret = FALSE;
435 guint i;
436
437 for (i = 0; i < gst_value_array_get_size (&ptdemux->ignored_pts); i++) {
438 const GValue *tmp = gst_value_array_get_value (&ptdemux->ignored_pts, i);
439
440 if (g_value_get_int (tmp) == pt) {
441 ret = TRUE;
442 break;
443 }
444 }
445
446 return ret;
447 }
448
449 static GstFlowReturn
gst_rtp_pt_demux_chain(GstPad * pad,GstObject * parent,GstBuffer * buf)450 gst_rtp_pt_demux_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
451 {
452 GstFlowReturn ret = GST_FLOW_OK;
453 GstRtpPtDemux *rtpdemux;
454 guint8 pt;
455 GstPad *srcpad;
456 GstCaps *caps;
457 GstRTPBuffer rtp = { NULL };
458
459 rtpdemux = GST_RTP_PT_DEMUX (parent);
460
461 if (!gst_rtp_buffer_map (buf, GST_MAP_READ, &rtp))
462 goto invalid_buffer;
463
464 pt = gst_rtp_buffer_get_payload_type (&rtp);
465 gst_rtp_buffer_unmap (&rtp);
466
467 if (gst_rtp_pt_demux_pt_is_ignored (rtpdemux, pt))
468 goto ignored;
469
470 GST_DEBUG_OBJECT (rtpdemux, "received buffer for pt %d", pt);
471
472 srcpad = find_pad_for_pt (rtpdemux, pt);
473 if (srcpad == NULL) {
474 /* new PT, create a src pad */
475 GstRtpPtDemuxPad *rtpdemuxpad;
476 GstElementClass *klass;
477 GstPadTemplate *templ;
478 gchar *padname;
479
480 caps = gst_rtp_pt_demux_get_caps (rtpdemux, pt);
481 if (!caps)
482 goto no_caps;
483
484 if (gst_rtp_pt_demux_pt_is_ignored (rtpdemux, pt))
485 goto ignored;
486
487 klass = GST_ELEMENT_GET_CLASS (rtpdemux);
488 templ = gst_element_class_get_pad_template (klass, "src_%u");
489 padname = g_strdup_printf ("src_%u", pt);
490 srcpad = gst_pad_new_from_template (templ, padname);
491 gst_pad_use_fixed_caps (srcpad);
492 g_free (padname);
493 gst_pad_set_event_function (srcpad, gst_rtp_pt_demux_src_event);
494
495 GST_DEBUG ("Adding pt=%d to the list.", pt);
496 rtpdemuxpad = g_slice_new0 (GstRtpPtDemuxPad);
497 rtpdemuxpad->pt = pt;
498 rtpdemuxpad->newcaps = FALSE;
499 rtpdemuxpad->pad = srcpad;
500 gst_object_ref (srcpad);
501 GST_OBJECT_LOCK (rtpdemux);
502 rtpdemux->srcpads = g_slist_append (rtpdemux->srcpads, rtpdemuxpad);
503 GST_OBJECT_UNLOCK (rtpdemux);
504
505 gst_pad_set_active (srcpad, TRUE);
506
507
508 /* First push the stream-start event, it must always come first */
509 gst_pad_push_event (srcpad,
510 gst_pad_get_sticky_event (rtpdemux->sink, GST_EVENT_STREAM_START, 0));
511
512 /* Then caps event is sent */
513 caps = gst_caps_make_writable (caps);
514 gst_caps_set_simple (caps, "payload", G_TYPE_INT, pt, NULL);
515 gst_pad_set_caps (srcpad, caps);
516 gst_caps_unref (caps);
517
518 /* First sticky events on sink pad are forwarded to the new src pad */
519 gst_pad_sticky_events_foreach (rtpdemux->sink, forward_sticky_events,
520 srcpad);
521
522 gst_element_add_pad (GST_ELEMENT_CAST (rtpdemux), srcpad);
523
524 GST_DEBUG ("emitting new-payload-type for pt %d", pt);
525 g_signal_emit (G_OBJECT (rtpdemux),
526 gst_rtp_pt_demux_signals[SIGNAL_NEW_PAYLOAD_TYPE], 0, pt, srcpad);
527 }
528
529 if (pt != rtpdemux->last_pt) {
530 gint emit_pt = pt;
531
532 /* our own signal with an extra flag that this is the only pad */
533 rtpdemux->last_pt = pt;
534 GST_DEBUG ("emitting payload-type-changed for pt %d", emit_pt);
535 g_signal_emit (G_OBJECT (rtpdemux),
536 gst_rtp_pt_demux_signals[SIGNAL_PAYLOAD_TYPE_CHANGE], 0, emit_pt);
537 }
538
539 while (need_caps_for_pt (rtpdemux, pt)) {
540 GST_DEBUG ("need new caps for %d", pt);
541 caps = gst_rtp_pt_demux_get_caps (rtpdemux, pt);
542 if (!caps)
543 goto no_caps;
544
545 clear_newcaps_for_pt (rtpdemux, pt);
546
547 caps = gst_caps_make_writable (caps);
548 gst_caps_set_simple (caps, "payload", G_TYPE_INT, pt, NULL);
549 gst_pad_set_caps (srcpad, caps);
550 gst_caps_unref (caps);
551 }
552
553 /* push to srcpad */
554 ret = gst_pad_push (srcpad, buf);
555
556 gst_object_unref (srcpad);
557
558 return ret;
559
560 ignored:
561 {
562 GST_DEBUG_OBJECT (rtpdemux, "Dropped buffer for pt %d", pt);
563 gst_buffer_unref (buf);
564 return GST_FLOW_OK;
565 }
566
567 /* ERRORS */
568 invalid_buffer:
569 {
570 /* this should not be fatal */
571 GST_ELEMENT_WARNING (rtpdemux, STREAM, DEMUX, (NULL),
572 ("Dropping invalid RTP payload"));
573 gst_buffer_unref (buf);
574 return GST_FLOW_ERROR;
575 }
576 no_caps:
577 {
578 GST_ELEMENT_ERROR (rtpdemux, STREAM, DECODE, (NULL),
579 ("Could not get caps for payload"));
580 gst_buffer_unref (buf);
581 if (srcpad)
582 gst_object_unref (srcpad);
583 return GST_FLOW_ERROR;
584 }
585 }
586
587 static GstPad *
find_pad_for_pt(GstRtpPtDemux * rtpdemux,guint8 pt)588 find_pad_for_pt (GstRtpPtDemux * rtpdemux, guint8 pt)
589 {
590 GstPad *respad = NULL;
591 GSList *walk;
592
593 GST_OBJECT_LOCK (rtpdemux);
594 for (walk = rtpdemux->srcpads; walk; walk = g_slist_next (walk)) {
595 GstRtpPtDemuxPad *pad = walk->data;
596
597 if (pad->pt == pt) {
598 respad = gst_object_ref (pad->pad);
599 break;
600 }
601 }
602 GST_OBJECT_UNLOCK (rtpdemux);
603
604 return respad;
605 }
606
607 static gboolean
gst_rtp_pt_demux_sink_event(GstPad * pad,GstObject * parent,GstEvent * event)608 gst_rtp_pt_demux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
609 {
610 GstRtpPtDemux *rtpdemux;
611 gboolean res = FALSE;
612
613 rtpdemux = GST_RTP_PT_DEMUX (parent);
614
615 switch (GST_EVENT_TYPE (event)) {
616 case GST_EVENT_CAPS:
617 {
618 gst_rtp_pt_demux_clear_pt_map (rtpdemux);
619 /* don't forward the event, we cleared the ptmap and on the next buffer we
620 * will add the pt to the caps and push a new caps event */
621 gst_event_unref (event);
622 res = TRUE;
623 break;
624 }
625 case GST_EVENT_CUSTOM_DOWNSTREAM:
626 {
627 const GstStructure *s;
628
629 s = gst_event_get_structure (event);
630
631 if (gst_structure_has_name (s, "GstRTPPacketLost")) {
632 GstPad *srcpad = find_pad_for_pt (rtpdemux, rtpdemux->last_pt);
633
634 if (srcpad) {
635 res = gst_pad_push_event (srcpad, event);
636 gst_object_unref (srcpad);
637 } else {
638 gst_event_unref (event);
639 }
640
641 } else {
642 res = gst_pad_event_default (pad, parent, event);
643 }
644 break;
645 }
646 default:
647 res = gst_pad_event_default (pad, parent, event);
648 break;
649 }
650
651 return res;
652 }
653
654
655 static gboolean
gst_rtp_pt_demux_src_event(GstPad * pad,GstObject * parent,GstEvent * event)656 gst_rtp_pt_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
657 {
658 GstRtpPtDemux *demux;
659 const GstStructure *s;
660
661 demux = GST_RTP_PT_DEMUX (parent);
662
663 switch (GST_EVENT_TYPE (event)) {
664 case GST_EVENT_CUSTOM_UPSTREAM:
665 case GST_EVENT_CUSTOM_BOTH:
666 case GST_EVENT_CUSTOM_BOTH_OOB:
667 s = gst_event_get_structure (event);
668 if (s && !gst_structure_has_field (s, "payload")) {
669 GSList *walk;
670
671 GST_OBJECT_LOCK (demux);
672 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
673 GstRtpPtDemuxPad *dpad = (GstRtpPtDemuxPad *) walk->data;
674
675 if (dpad->pad == pad) {
676 GstStructure *ws;
677
678 event =
679 GST_EVENT_CAST (gst_mini_object_make_writable
680 (GST_MINI_OBJECT_CAST (event)));
681 ws = gst_event_writable_structure (event);
682 gst_structure_set (ws, "payload", G_TYPE_UINT, dpad->pt, NULL);
683 break;
684 }
685 }
686 GST_OBJECT_UNLOCK (demux);
687 }
688 break;
689 default:
690 break;
691 }
692
693 return gst_pad_event_default (pad, parent, event);
694 }
695
696 /*
697 * Reserves resources for the object.
698 */
699 static gboolean
gst_rtp_pt_demux_setup(GstRtpPtDemux * ptdemux)700 gst_rtp_pt_demux_setup (GstRtpPtDemux * ptdemux)
701 {
702 ptdemux->srcpads = NULL;
703 ptdemux->last_pt = 0xFFFF;
704
705 return TRUE;
706 }
707
708 /*
709 * Free resources for the object.
710 */
711 static void
gst_rtp_pt_demux_release(GstRtpPtDemux * ptdemux)712 gst_rtp_pt_demux_release (GstRtpPtDemux * ptdemux)
713 {
714 GSList *tmppads;
715 GSList *walk;
716
717 GST_OBJECT_LOCK (ptdemux);
718 tmppads = ptdemux->srcpads;
719 ptdemux->srcpads = NULL;
720 GST_OBJECT_UNLOCK (ptdemux);
721
722 for (walk = tmppads; walk; walk = g_slist_next (walk)) {
723 GstRtpPtDemuxPad *pad = walk->data;
724
725 gst_pad_set_active (pad->pad, FALSE);
726 gst_element_remove_pad (GST_ELEMENT_CAST (ptdemux), pad->pad);
727 g_slice_free (GstRtpPtDemuxPad, pad);
728 }
729 g_slist_free (tmppads);
730 }
731
732 static GstStateChangeReturn
gst_rtp_pt_demux_change_state(GstElement * element,GstStateChange transition)733 gst_rtp_pt_demux_change_state (GstElement * element, GstStateChange transition)
734 {
735 GstStateChangeReturn ret;
736 GstRtpPtDemux *ptdemux;
737
738 ptdemux = GST_RTP_PT_DEMUX (element);
739
740 switch (transition) {
741 case GST_STATE_CHANGE_NULL_TO_READY:
742 if (gst_rtp_pt_demux_setup (ptdemux) != TRUE)
743 ret = GST_STATE_CHANGE_FAILURE;
744 break;
745 case GST_STATE_CHANGE_READY_TO_PAUSED:
746 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
747 default:
748 break;
749 }
750
751 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
752
753 switch (transition) {
754 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
755 case GST_STATE_CHANGE_PAUSED_TO_READY:
756 break;
757 case GST_STATE_CHANGE_READY_TO_NULL:
758 gst_rtp_pt_demux_release (ptdemux);
759 break;
760 default:
761 break;
762 }
763
764 return ret;
765 }
766