2 * Copyright (C) <2007> Wim Taymans <wim.taymans@gmail.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
23 * SECTION:element-gstrtpssrcdemux
25 * gstrtpssrcdemux acts as a demuxer for RTP packets based on the SSRC of the
26 * packets. Its main purpose is to allow an application to easily receive and
27 * decode an RTP stream with multiple SSRCs.
29 * For each SSRC that is detected, a new pad will be created and the
30 * #GstRtpSsrcDemux::new-ssrc-pad signal will be emitted.
33 * <title>Example pipelines</title>
35 * gst-launch udpsrc caps="application/x-rtp" ! gstrtpssrcdemux ! fakesink
36 * ]| Takes an RTP stream and send the RTP packets with the first detected SSRC
37 * to fakesink, discarding the other SSRCs.
40 * Last reviewed on 2007-05-28 (0.10.5)
48 #include <gst/rtp/gstrtpbuffer.h>
49 #include <gst/rtp/gstrtcpbuffer.h>
51 #include "gstrtpbin-marshal.h"
52 #include "gstrtpssrcdemux.h"
54 GST_DEBUG_CATEGORY_STATIC (gst_rtp_ssrc_demux_debug);
55 #define GST_CAT_DEFAULT gst_rtp_ssrc_demux_debug
57 /* generic templates */
58 static GstStaticPadTemplate rtp_ssrc_demux_sink_template =
59 GST_STATIC_PAD_TEMPLATE ("sink",
62 GST_STATIC_CAPS ("application/x-rtp")
65 static GstStaticPadTemplate rtp_ssrc_demux_rtcp_sink_template =
66 GST_STATIC_PAD_TEMPLATE ("rtcp_sink",
69 GST_STATIC_CAPS ("application/x-rtcp")
72 static GstStaticPadTemplate rtp_ssrc_demux_src_template =
73 GST_STATIC_PAD_TEMPLATE ("src_%d",
76 GST_STATIC_CAPS ("application/x-rtp")
79 static GstStaticPadTemplate rtp_ssrc_demux_rtcp_src_template =
80 GST_STATIC_PAD_TEMPLATE ("rtcp_src_%d",
83 GST_STATIC_CAPS ("application/x-rtcp")
86 #define GST_PAD_LOCK(obj) (g_mutex_lock ((obj)->padlock))
87 #define GST_PAD_UNLOCK(obj) (g_mutex_unlock ((obj)->padlock))
93 SIGNAL_REMOVED_SSRC_PAD,
98 GST_BOILERPLATE (GstRtpSsrcDemux, gst_rtp_ssrc_demux, GstElement,
102 /* GObject vmethods */
103 static void gst_rtp_ssrc_demux_dispose (GObject * object);
104 static void gst_rtp_ssrc_demux_finalize (GObject * object);
106 /* GstElement vmethods */
107 static GstStateChangeReturn gst_rtp_ssrc_demux_change_state (GstElement *
108 element, GstStateChange transition);
110 static void gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux,
114 static GstFlowReturn gst_rtp_ssrc_demux_chain (GstPad * pad, GstBuffer * buf);
115 static gboolean gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstEvent * event);
117 static GstFlowReturn gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad,
119 static gboolean gst_rtp_ssrc_demux_rtcp_sink_event (GstPad * pad,
123 static gboolean gst_rtp_ssrc_demux_src_event (GstPad * pad, GstEvent * event);
124 static GstIterator *gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad *
126 static gboolean gst_rtp_ssrc_demux_src_query (GstPad * pad, GstQuery * query);
128 static guint gst_rtp_ssrc_demux_signals[LAST_SIGNAL] = { 0 };
131 * Item for storing GstPad <-> SSRC pairs.
133 struct _GstRtpSsrcDemuxPad
141 /* find a src pad for a given SSRC, returns NULL if the SSRC was not found
143 static GstRtpSsrcDemuxPad *
144 find_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
148 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
149 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
151 if (pad->ssrc == ssrc)
157 static GstRtpSsrcDemuxPad *
158 find_or_create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
160 GstPad *rtp_pad, *rtcp_pad;
161 GstElementClass *klass;
162 GstPadTemplate *templ;
164 GstRtpSsrcDemuxPad *demuxpad;
166 GST_DEBUG_OBJECT (demux, "creating pad for SSRC %08x", ssrc);
168 GST_OBJECT_LOCK (demux);
170 demuxpad = find_demux_pad_for_ssrc (demux, ssrc);
171 if (demuxpad != NULL) {
172 GST_OBJECT_UNLOCK (demux);
176 klass = GST_ELEMENT_GET_CLASS (demux);
177 templ = gst_element_class_get_pad_template (klass, "src_%d");
178 padname = g_strdup_printf ("src_%d", ssrc);
179 rtp_pad = gst_pad_new_from_template (templ, padname);
182 templ = gst_element_class_get_pad_template (klass, "rtcp_src_%d");
183 padname = g_strdup_printf ("rtcp_src_%d", ssrc);
184 rtcp_pad = gst_pad_new_from_template (templ, padname);
187 /* wrap in structure and add to list */
188 demuxpad = g_new0 (GstRtpSsrcDemuxPad, 1);
189 demuxpad->ssrc = ssrc;
190 demuxpad->rtp_pad = rtp_pad;
191 demuxpad->rtcp_pad = rtcp_pad;
193 gst_pad_set_element_private (rtp_pad, demuxpad);
194 gst_pad_set_element_private (rtcp_pad, demuxpad);
196 demux->srcpads = g_slist_prepend (demux->srcpads, demuxpad);
198 /* copy caps from input */
199 gst_pad_set_caps (rtp_pad, GST_PAD_CAPS (demux->rtp_sink));
200 gst_pad_use_fixed_caps (rtp_pad);
201 gst_pad_set_caps (rtcp_pad, GST_PAD_CAPS (demux->rtcp_sink));
202 gst_pad_use_fixed_caps (rtcp_pad);
204 gst_pad_set_event_function (rtp_pad, gst_rtp_ssrc_demux_src_event);
205 gst_pad_set_query_function (rtp_pad, gst_rtp_ssrc_demux_src_query);
206 gst_pad_set_iterate_internal_links_function (rtp_pad,
207 gst_rtp_ssrc_demux_iterate_internal_links_src);
208 gst_pad_set_active (rtp_pad, TRUE);
210 gst_pad_set_event_function (rtcp_pad, gst_rtp_ssrc_demux_src_event);
211 gst_pad_set_iterate_internal_links_function (rtcp_pad,
212 gst_rtp_ssrc_demux_iterate_internal_links_src);
213 gst_pad_set_active (rtcp_pad, TRUE);
215 GST_OBJECT_UNLOCK (demux);
217 gst_element_add_pad (GST_ELEMENT_CAST (demux), rtp_pad);
218 gst_element_add_pad (GST_ELEMENT_CAST (demux), rtcp_pad);
220 g_signal_emit (G_OBJECT (demux),
221 gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
227 gst_rtp_ssrc_demux_base_init (gpointer g_class)
229 GstElementClass *gstelement_klass = GST_ELEMENT_CLASS (g_class);
231 gst_element_class_add_pad_template (gstelement_klass,
232 gst_static_pad_template_get (&rtp_ssrc_demux_sink_template));
233 gst_element_class_add_pad_template (gstelement_klass,
234 gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_sink_template));
235 gst_element_class_add_pad_template (gstelement_klass,
236 gst_static_pad_template_get (&rtp_ssrc_demux_src_template));
237 gst_element_class_add_pad_template (gstelement_klass,
238 gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_src_template));
240 gst_element_class_set_details_simple (gstelement_klass, "RTP SSRC Demux",
242 "Splits RTP streams based on the SSRC",
243 "Wim Taymans <wim.taymans@gmail.com>");
247 gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
249 GObjectClass *gobject_klass;
250 GstElementClass *gstelement_klass;
251 GstRtpSsrcDemuxClass *gstrtpssrcdemux_klass;
253 gobject_klass = (GObjectClass *) klass;
254 gstelement_klass = (GstElementClass *) klass;
255 gstrtpssrcdemux_klass = (GstRtpSsrcDemuxClass *) klass;
257 gobject_klass->dispose = gst_rtp_ssrc_demux_dispose;
258 gobject_klass->finalize = gst_rtp_ssrc_demux_finalize;
261 * GstRtpSsrcDemux::new-ssrc-pad:
262 * @demux: the object which received the signal
263 * @ssrc: the SSRC of the pad
266 * Emited when a new SSRC pad has been created.
268 gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD] =
269 g_signal_new ("new-ssrc-pad",
270 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
271 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, new_ssrc_pad),
272 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
273 G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
276 * GstRtpSsrcDemux::removed-ssrc-pad:
277 * @demux: the object which received the signal
278 * @ssrc: the SSRC of the pad
279 * @pad: the removed pad.
281 * Emited when a SSRC pad has been removed.
283 gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD] =
284 g_signal_new ("removed-ssrc-pad",
285 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
286 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, removed_ssrc_pad),
287 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
288 G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
291 * GstRtpSsrcDemux::clear-ssrc:
292 * @demux: the object which received the signal
293 * @ssrc: the SSRC of the pad
295 * Action signal to remove the pad for SSRC.
297 gst_rtp_ssrc_demux_signals[SIGNAL_CLEAR_SSRC] =
298 g_signal_new ("clear-ssrc",
299 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
300 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, clear_ssrc),
301 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT);
303 gstelement_klass->change_state =
304 GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_change_state);
305 gstrtpssrcdemux_klass->clear_ssrc =
306 GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_clear_ssrc);
308 GST_DEBUG_CATEGORY_INIT (gst_rtp_ssrc_demux_debug,
309 "rtpssrcdemux", 0, "RTP SSRC demuxer");
313 gst_rtp_ssrc_demux_init (GstRtpSsrcDemux * demux,
314 GstRtpSsrcDemuxClass * g_class)
316 GstElementClass *klass = GST_ELEMENT_GET_CLASS (demux);
319 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
321 gst_pad_set_chain_function (demux->rtp_sink, gst_rtp_ssrc_demux_chain);
322 gst_pad_set_event_function (demux->rtp_sink, gst_rtp_ssrc_demux_sink_event);
323 gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtp_sink);
326 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
327 "rtcp_sink"), "rtcp_sink");
328 gst_pad_set_chain_function (demux->rtcp_sink, gst_rtp_ssrc_demux_rtcp_chain);
329 gst_pad_set_event_function (demux->rtcp_sink,
330 gst_rtp_ssrc_demux_rtcp_sink_event);
331 gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtcp_sink);
333 demux->padlock = g_mutex_new ();
335 gst_segment_init (&demux->segment, GST_FORMAT_UNDEFINED);
339 gst_rtp_ssrc_demux_reset (GstRtpSsrcDemux * demux)
343 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
344 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
346 gst_pad_set_active (dpad->rtp_pad, FALSE);
347 gst_pad_set_active (dpad->rtcp_pad, FALSE);
349 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
350 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
353 g_slist_free (demux->srcpads);
354 demux->srcpads = NULL;
358 gst_rtp_ssrc_demux_dispose (GObject * object)
360 GstRtpSsrcDemux *demux;
362 demux = GST_RTP_SSRC_DEMUX (object);
364 gst_rtp_ssrc_demux_reset (demux);
366 G_OBJECT_CLASS (parent_class)->dispose (object);
370 gst_rtp_ssrc_demux_finalize (GObject * object)
372 GstRtpSsrcDemux *demux;
374 demux = GST_RTP_SSRC_DEMUX (object);
375 g_mutex_free (demux->padlock);
377 G_OBJECT_CLASS (parent_class)->finalize (object);
381 gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
383 GstRtpSsrcDemuxPad *dpad;
385 GST_PAD_LOCK (demux);
386 dpad = find_demux_pad_for_ssrc (demux, ssrc);
388 GST_PAD_UNLOCK (demux);
392 GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
394 demux->srcpads = g_slist_remove (demux->srcpads, dpad);
395 GST_PAD_UNLOCK (demux);
397 gst_pad_set_active (dpad->rtp_pad, FALSE);
398 gst_pad_set_active (dpad->rtcp_pad, FALSE);
400 g_signal_emit (G_OBJECT (demux),
401 gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD], 0, ssrc,
404 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
405 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
414 GST_WARNING_OBJECT (demux, "unknown SSRC %08x", ssrc);
420 gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstEvent * event)
422 GstRtpSsrcDemux *demux;
423 gboolean res = FALSE;
425 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
426 if (G_UNLIKELY (demux == NULL)) {
427 gst_event_unref (event);
431 switch (GST_EVENT_TYPE (event)) {
432 case GST_EVENT_FLUSH_STOP:
433 gst_segment_init (&demux->segment, GST_FORMAT_UNDEFINED);
434 case GST_EVENT_NEWSEGMENT:
441 /* need local snapshot of pads;
442 * should not push downstream while holding lock as that might deadlock
443 * with stuff traveling upstream tyring to get this lock while holding
444 * other (stream)lock */
445 GST_PAD_LOCK (demux);
446 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
447 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
449 pads = g_slist_prepend (pads, gst_object_ref (pad->rtp_pad));
451 GST_PAD_UNLOCK (demux);
452 for (walk = pads; walk; walk = g_slist_next (walk)) {
453 GstPad *pad = (GstPad *) walk->data;
455 gst_event_ref (event);
456 res &= gst_pad_push_event (pad, event);
457 gst_object_unref (pad);
460 gst_event_unref (event);
465 gst_object_unref (demux);
470 gst_rtp_ssrc_demux_rtcp_sink_event (GstPad * pad, GstEvent * event)
472 GstRtpSsrcDemux *demux;
473 gboolean res = FALSE;
475 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
477 switch (GST_EVENT_TYPE (event)) {
478 case GST_EVENT_NEWSEGMENT:
485 GST_PAD_LOCK (demux);
486 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
487 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
489 pads = g_slist_prepend (pads, gst_object_ref (pad->rtcp_pad));
491 GST_PAD_UNLOCK (demux);
492 for (walk = pads; walk; walk = g_slist_next (walk)) {
493 GstPad *pad = (GstPad *) walk->data;
495 gst_event_ref (event);
496 res &= gst_pad_push_event (pad, event);
497 gst_object_unref (pad);
500 gst_event_unref (event);
504 gst_object_unref (demux);
509 gst_rtp_ssrc_demux_chain (GstPad * pad, GstBuffer * buf)
512 GstRtpSsrcDemux *demux;
514 GstRtpSsrcDemuxPad *dpad;
516 demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
518 if (!gst_rtp_buffer_validate (buf))
519 goto invalid_payload;
521 ssrc = gst_rtp_buffer_get_ssrc (buf);
523 GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
525 dpad = find_or_create_demux_pad_for_ssrc (demux, ssrc);
530 ret = gst_pad_push (dpad->rtp_pad, buf);
537 /* this is fatal and should be filtered earlier */
538 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
539 ("Dropping invalid RTP payload"));
540 gst_buffer_unref (buf);
541 return GST_FLOW_ERROR;
545 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
546 ("Could not create new pad"));
547 gst_buffer_unref (buf);
548 return GST_FLOW_ERROR;
553 gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstBuffer * buf)
556 GstRtpSsrcDemux *demux;
558 GstRtpSsrcDemuxPad *dpad;
559 GstRTCPPacket packet;
561 demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
563 if (!gst_rtcp_buffer_validate (buf))
566 if (!gst_rtcp_buffer_get_first_packet (buf, &packet))
569 /* first packet must be SR or RR or else the validate would have failed */
570 switch (gst_rtcp_packet_get_type (&packet)) {
571 case GST_RTCP_TYPE_SR:
572 /* get the ssrc so that we can route it to the right source pad */
573 gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, NULL, NULL,
577 goto unexpected_rtcp;
580 GST_DEBUG_OBJECT (demux, "received RTCP of SSRC %08x", ssrc);
582 dpad = find_or_create_demux_pad_for_ssrc (demux, ssrc);
588 ret = gst_pad_push (dpad->rtcp_pad, buf);
595 /* this is fatal and should be filtered earlier */
596 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
597 ("Dropping invalid RTCP packet"));
598 gst_buffer_unref (buf);
599 return GST_FLOW_ERROR;
603 GST_DEBUG_OBJECT (demux, "dropping unexpected RTCP packet");
604 gst_buffer_unref (buf);
609 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
610 ("Could not create new pad"));
611 gst_buffer_unref (buf);
612 return GST_FLOW_ERROR;
617 gst_rtp_ssrc_demux_src_event (GstPad * pad, GstEvent * event)
619 GstRtpSsrcDemux *demux;
620 const GstStructure *s;
622 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
624 switch (GST_EVENT_TYPE (event)) {
625 case GST_EVENT_CUSTOM_UPSTREAM:
626 case GST_EVENT_CUSTOM_BOTH:
627 case GST_EVENT_CUSTOM_BOTH_OOB:
628 s = gst_event_get_structure (event);
629 if (s && !gst_structure_has_field (s, "ssrc")) {
632 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
633 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
635 if (dpad->rtp_pad == pad || dpad->rtcp_pad == pad) {
637 GST_EVENT_CAST (gst_mini_object_make_writable
638 (GST_MINI_OBJECT_CAST (event)));
639 gst_structure_set (event->structure, "ssrc", G_TYPE_UINT,
650 gst_object_unref (demux);
652 return gst_pad_event_default (pad, event);
656 gst_rtp_ssrc_demux_iterate_internal_links_src (GstPad * pad)
658 GstRtpSsrcDemux *demux;
659 GstPad *otherpad = NULL;
660 GstIterator *it = NULL;
663 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
668 GST_PAD_LOCK (demux);
669 for (current = demux->srcpads; current; current = g_slist_next (current)) {
670 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) current->data;
672 if (pad == dpad->rtp_pad) {
673 otherpad = demux->rtp_sink;
675 } else if (pad == dpad->rtcp_pad) {
676 otherpad = demux->rtcp_sink;
680 it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
681 (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
682 GST_PAD_UNLOCK (demux);
684 gst_object_unref (demux);
689 gst_rtp_ssrc_demux_src_query (GstPad * pad, GstQuery * query)
691 GstRtpSsrcDemux *demux;
692 gboolean res = FALSE;
694 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
695 if (G_UNLIKELY (demux == NULL))
698 switch (GST_QUERY_TYPE (query)) {
699 case GST_QUERY_LATENCY:
702 if ((res = gst_pad_peer_query (demux->rtp_sink, query))) {
704 GstClockTime min_latency, max_latency;
705 GstRtpSsrcDemuxPad *demuxpad;
707 demuxpad = gst_pad_get_element_private (pad);
709 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
711 GST_DEBUG_OBJECT (demux, "peer min latency %" GST_TIME_FORMAT,
712 GST_TIME_ARGS (min_latency));
714 GST_DEBUG_OBJECT (demux, "latency for SSRC %08x", demuxpad->ssrc);
716 gst_query_set_latency (query, live, min_latency, max_latency);
721 res = gst_pad_query_default (pad, query);
724 gst_object_unref (demux);
729 static GstStateChangeReturn
730 gst_rtp_ssrc_demux_change_state (GstElement * element,
731 GstStateChange transition)
733 GstStateChangeReturn ret;
734 GstRtpSsrcDemux *demux;
736 demux = GST_RTP_SSRC_DEMUX (element);
738 switch (transition) {
739 case GST_STATE_CHANGE_NULL_TO_READY:
740 case GST_STATE_CHANGE_READY_TO_PAUSED:
741 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
746 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
748 switch (transition) {
749 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
751 case GST_STATE_CHANGE_PAUSED_TO_READY:
752 gst_rtp_ssrc_demux_reset (demux);
754 case GST_STATE_CHANGE_READY_TO_NULL: