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 (GstPad * pad);
125 static gboolean gst_rtp_ssrc_demux_src_query (GstPad * pad, GstQuery * query);
127 static guint gst_rtp_ssrc_demux_signals[LAST_SIGNAL] = { 0 };
130 * Item for storing GstPad <-> SSRC pairs.
132 struct _GstRtpSsrcDemuxPad
140 /* find a src pad for a given SSRC, returns NULL if the SSRC was not found
142 static GstRtpSsrcDemuxPad *
143 find_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
147 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
148 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
150 if (pad->ssrc == ssrc)
157 static GstRtpSsrcDemuxPad *
158 create_demux_pad_for_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc,
159 GstClockTime timestamp)
161 GstPad *rtp_pad, *rtcp_pad;
162 GstElementClass *klass;
163 GstPadTemplate *templ;
165 GstRtpSsrcDemuxPad *demuxpad;
167 GST_DEBUG_OBJECT (demux, "creating pad for SSRC %08x", ssrc);
169 klass = GST_ELEMENT_GET_CLASS (demux);
170 templ = gst_element_class_get_pad_template (klass, "src_%d");
171 padname = g_strdup_printf ("src_%d", ssrc);
172 rtp_pad = gst_pad_new_from_template (templ, padname);
175 templ = gst_element_class_get_pad_template (klass, "rtcp_src_%d");
176 padname = g_strdup_printf ("rtcp_src_%d", ssrc);
177 rtcp_pad = gst_pad_new_from_template (templ, padname);
180 /* we use the first timestamp received to calculate the difference between
181 * timestamps on all streams */
182 GST_DEBUG_OBJECT (demux, "SSRC %08x, first timestamp %" GST_TIME_FORMAT,
183 ssrc, GST_TIME_ARGS (timestamp));
185 /* wrap in structure and add to list */
186 demuxpad = g_new0 (GstRtpSsrcDemuxPad, 1);
187 demuxpad->ssrc = ssrc;
188 demuxpad->rtp_pad = rtp_pad;
189 demuxpad->rtcp_pad = rtcp_pad;
191 GST_DEBUG_OBJECT (demux, "first timestamp %" GST_TIME_FORMAT,
192 GST_TIME_ARGS (timestamp));
194 gst_pad_set_element_private (rtp_pad, demuxpad);
195 gst_pad_set_element_private (rtcp_pad, demuxpad);
197 demux->srcpads = g_slist_prepend (demux->srcpads, demuxpad);
199 /* copy caps from input */
200 gst_pad_set_caps (rtp_pad, GST_PAD_CAPS (demux->rtp_sink));
201 gst_pad_use_fixed_caps (rtp_pad);
202 gst_pad_set_caps (rtcp_pad, GST_PAD_CAPS (demux->rtcp_sink));
203 gst_pad_use_fixed_caps (rtcp_pad);
205 gst_pad_set_event_function (rtp_pad, gst_rtp_ssrc_demux_src_event);
206 gst_pad_set_query_function (rtp_pad, gst_rtp_ssrc_demux_src_query);
207 gst_pad_set_iterate_internal_links_function (rtp_pad,
208 gst_rtp_ssrc_demux_iterate_internal_links);
209 gst_pad_set_active (rtp_pad, TRUE);
211 gst_pad_set_event_function (rtcp_pad, gst_rtp_ssrc_demux_src_event);
212 gst_pad_set_iterate_internal_links_function (rtcp_pad,
213 gst_rtp_ssrc_demux_iterate_internal_links);
214 gst_pad_set_active (rtcp_pad, TRUE);
216 gst_element_add_pad (GST_ELEMENT_CAST (demux), rtp_pad);
217 gst_element_add_pad (GST_ELEMENT_CAST (demux), rtcp_pad);
219 g_signal_emit (G_OBJECT (demux),
220 gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD], 0, ssrc, rtp_pad);
226 gst_rtp_ssrc_demux_base_init (gpointer g_class)
228 GstElementClass *gstelement_klass = GST_ELEMENT_CLASS (g_class);
230 gst_element_class_add_pad_template (gstelement_klass,
231 gst_static_pad_template_get (&rtp_ssrc_demux_sink_template));
232 gst_element_class_add_pad_template (gstelement_klass,
233 gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_sink_template));
234 gst_element_class_add_pad_template (gstelement_klass,
235 gst_static_pad_template_get (&rtp_ssrc_demux_src_template));
236 gst_element_class_add_pad_template (gstelement_klass,
237 gst_static_pad_template_get (&rtp_ssrc_demux_rtcp_src_template));
239 gst_element_class_set_details_simple (gstelement_klass, "RTP SSRC Demux",
241 "Splits RTP streams based on the SSRC",
242 "Wim Taymans <wim.taymans@gmail.com>");
246 gst_rtp_ssrc_demux_class_init (GstRtpSsrcDemuxClass * klass)
248 GObjectClass *gobject_klass;
249 GstElementClass *gstelement_klass;
250 GstRtpSsrcDemuxClass *gstrtpssrcdemux_klass;
252 gobject_klass = (GObjectClass *) klass;
253 gstelement_klass = (GstElementClass *) klass;
254 gstrtpssrcdemux_klass = (GstRtpSsrcDemuxClass *) klass;
256 gobject_klass->dispose = gst_rtp_ssrc_demux_dispose;
257 gobject_klass->finalize = gst_rtp_ssrc_demux_finalize;
260 * GstRtpSsrcDemux::new-ssrc-pad:
261 * @demux: the object which received the signal
262 * @ssrc: the SSRC of the pad
265 * Emited when a new SSRC pad has been created.
267 gst_rtp_ssrc_demux_signals[SIGNAL_NEW_SSRC_PAD] =
268 g_signal_new ("new-ssrc-pad",
269 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
270 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, new_ssrc_pad),
271 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
272 G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
275 * GstRtpSsrcDemux::removed-ssrc-pad:
276 * @demux: the object which received the signal
277 * @ssrc: the SSRC of the pad
278 * @pad: the removed pad.
280 * Emited when a SSRC pad has been removed.
282 gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD] =
283 g_signal_new ("removed-ssrc-pad",
284 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST,
285 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, removed_ssrc_pad),
286 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT_OBJECT,
287 G_TYPE_NONE, 2, G_TYPE_UINT, GST_TYPE_PAD);
290 * GstRtpSsrcDemux::clear-ssrc:
291 * @demux: the object which received the signal
292 * @ssrc: the SSRC of the pad
294 * Action signal to remove the pad for SSRC.
296 gst_rtp_ssrc_demux_signals[SIGNAL_CLEAR_SSRC] =
297 g_signal_new ("clear-ssrc",
298 G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
299 G_STRUCT_OFFSET (GstRtpSsrcDemuxClass, clear_ssrc),
300 NULL, NULL, gst_rtp_bin_marshal_VOID__UINT, G_TYPE_NONE, 1, G_TYPE_UINT);
302 gstelement_klass->change_state =
303 GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_change_state);
304 gstrtpssrcdemux_klass->clear_ssrc =
305 GST_DEBUG_FUNCPTR (gst_rtp_ssrc_demux_clear_ssrc);
307 GST_DEBUG_CATEGORY_INIT (gst_rtp_ssrc_demux_debug,
308 "rtpssrcdemux", 0, "RTP SSRC demuxer");
312 gst_rtp_ssrc_demux_init (GstRtpSsrcDemux * demux,
313 GstRtpSsrcDemuxClass * g_class)
315 GstElementClass *klass = GST_ELEMENT_GET_CLASS (demux);
318 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
320 gst_pad_set_chain_function (demux->rtp_sink, gst_rtp_ssrc_demux_chain);
321 gst_pad_set_event_function (demux->rtp_sink, gst_rtp_ssrc_demux_sink_event);
322 gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtp_sink);
325 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
326 "rtcp_sink"), "rtcp_sink");
327 gst_pad_set_chain_function (demux->rtcp_sink, gst_rtp_ssrc_demux_rtcp_chain);
328 gst_pad_set_event_function (demux->rtcp_sink,
329 gst_rtp_ssrc_demux_rtcp_sink_event);
330 gst_element_add_pad (GST_ELEMENT_CAST (demux), demux->rtcp_sink);
332 demux->padlock = g_mutex_new ();
334 gst_segment_init (&demux->segment, GST_FORMAT_UNDEFINED);
338 gst_rtp_ssrc_demux_reset (GstRtpSsrcDemux * demux)
342 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
343 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
345 gst_pad_set_active (dpad->rtp_pad, FALSE);
346 gst_pad_set_active (dpad->rtcp_pad, FALSE);
348 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
349 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
352 g_slist_free (demux->srcpads);
353 demux->srcpads = NULL;
357 gst_rtp_ssrc_demux_dispose (GObject * object)
359 GstRtpSsrcDemux *demux;
361 demux = GST_RTP_SSRC_DEMUX (object);
363 gst_rtp_ssrc_demux_reset (demux);
365 G_OBJECT_CLASS (parent_class)->dispose (object);
369 gst_rtp_ssrc_demux_finalize (GObject * object)
371 GstRtpSsrcDemux *demux;
373 demux = GST_RTP_SSRC_DEMUX (object);
374 g_mutex_free (demux->padlock);
376 G_OBJECT_CLASS (parent_class)->finalize (object);
380 gst_rtp_ssrc_demux_clear_ssrc (GstRtpSsrcDemux * demux, guint32 ssrc)
382 GstRtpSsrcDemuxPad *dpad;
384 GST_PAD_LOCK (demux);
385 dpad = find_demux_pad_for_ssrc (demux, ssrc);
387 GST_PAD_UNLOCK (demux);
391 GST_DEBUG_OBJECT (demux, "clearing pad for SSRC %08x", ssrc);
393 demux->srcpads = g_slist_remove (demux->srcpads, dpad);
394 GST_PAD_UNLOCK (demux);
396 gst_pad_set_active (dpad->rtp_pad, FALSE);
397 gst_pad_set_active (dpad->rtcp_pad, FALSE);
399 g_signal_emit (G_OBJECT (demux),
400 gst_rtp_ssrc_demux_signals[SIGNAL_REMOVED_SSRC_PAD], 0, ssrc,
403 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtp_pad);
404 gst_element_remove_pad (GST_ELEMENT_CAST (demux), dpad->rtcp_pad);
413 GST_WARNING_OBJECT (demux, "unknown SSRC %08x", ssrc);
419 gst_rtp_ssrc_demux_sink_event (GstPad * pad, GstEvent * event)
421 GstRtpSsrcDemux *demux;
422 gboolean res = FALSE;
424 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
425 if (G_UNLIKELY (demux == NULL)) {
426 gst_event_unref (event);
430 switch (GST_EVENT_TYPE (event)) {
431 case GST_EVENT_FLUSH_STOP:
432 gst_segment_init (&demux->segment, GST_FORMAT_UNDEFINED);
433 case GST_EVENT_NEWSEGMENT:
440 /* need local snapshot of pads;
441 * should not push downstream while holding lock as that might deadlock
442 * with stuff traveling upstream tyring to get this lock while holding
443 * other (stream)lock */
444 GST_PAD_LOCK (demux);
445 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
446 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
448 pads = g_slist_prepend (pads, gst_object_ref (pad->rtp_pad));
450 GST_PAD_UNLOCK (demux);
451 for (walk = pads; walk; walk = g_slist_next (walk)) {
452 GstPad *pad = (GstPad *) walk->data;
454 gst_event_ref (event);
455 res &= gst_pad_push_event (pad, event);
456 gst_object_unref (pad);
459 gst_event_unref (event);
464 gst_object_unref (demux);
469 gst_rtp_ssrc_demux_rtcp_sink_event (GstPad * pad, GstEvent * event)
471 GstRtpSsrcDemux *demux;
472 gboolean res = FALSE;
474 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
476 switch (GST_EVENT_TYPE (event)) {
477 case GST_EVENT_NEWSEGMENT:
484 GST_PAD_LOCK (demux);
485 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
486 GstRtpSsrcDemuxPad *pad = (GstRtpSsrcDemuxPad *) walk->data;
488 pads = g_slist_prepend (pads, gst_object_ref (pad->rtcp_pad));
490 GST_PAD_UNLOCK (demux);
491 for (walk = pads; walk; walk = g_slist_next (walk)) {
492 GstPad *pad = (GstPad *) walk->data;
494 gst_event_ref (event);
495 res &= gst_pad_push_event (pad, event);
496 gst_object_unref (pad);
499 gst_event_unref (event);
503 gst_object_unref (demux);
508 gst_rtp_ssrc_demux_chain (GstPad * pad, GstBuffer * buf)
511 GstRtpSsrcDemux *demux;
513 GstRtpSsrcDemuxPad *dpad;
515 demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
517 if (!gst_rtp_buffer_validate (buf))
518 goto invalid_payload;
520 ssrc = gst_rtp_buffer_get_ssrc (buf);
522 GST_DEBUG_OBJECT (demux, "received buffer of SSRC %08x", ssrc);
524 GST_PAD_LOCK (demux);
525 dpad = find_demux_pad_for_ssrc (demux, ssrc);
528 create_demux_pad_for_ssrc (demux, ssrc,
529 GST_BUFFER_TIMESTAMP (buf))))
532 GST_PAD_UNLOCK (demux);
535 ret = gst_pad_push (dpad->rtp_pad, buf);
542 /* this is fatal and should be filtered earlier */
543 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
544 ("Dropping invalid RTP payload"));
545 gst_buffer_unref (buf);
546 return GST_FLOW_ERROR;
550 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
551 ("Could not create new pad"));
552 GST_PAD_UNLOCK (demux);
553 gst_buffer_unref (buf);
554 return GST_FLOW_ERROR;
559 gst_rtp_ssrc_demux_rtcp_chain (GstPad * pad, GstBuffer * buf)
562 GstRtpSsrcDemux *demux;
564 GstRtpSsrcDemuxPad *dpad;
565 GstRTCPPacket packet;
567 demux = GST_RTP_SSRC_DEMUX (GST_OBJECT_PARENT (pad));
569 if (!gst_rtcp_buffer_validate (buf))
572 if (!gst_rtcp_buffer_get_first_packet (buf, &packet))
575 /* first packet must be SR or RR or else the validate would have failed */
576 switch (gst_rtcp_packet_get_type (&packet)) {
577 case GST_RTCP_TYPE_SR:
578 /* get the ssrc so that we can route it to the right source pad */
579 gst_rtcp_packet_sr_get_sender_info (&packet, &ssrc, NULL, NULL, NULL,
583 goto unexpected_rtcp;
586 GST_DEBUG_OBJECT (demux, "received RTCP of SSRC %08x", ssrc);
588 GST_PAD_LOCK (demux);
589 dpad = find_demux_pad_for_ssrc (demux, ssrc);
591 GST_DEBUG_OBJECT (demux, "creating pad for SSRC %08x", ssrc);
592 if (!(dpad = create_demux_pad_for_ssrc (demux, ssrc, -1)))
595 GST_PAD_UNLOCK (demux);
598 ret = gst_pad_push (dpad->rtcp_pad, buf);
605 /* this is fatal and should be filtered earlier */
606 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
607 ("Dropping invalid RTCP packet"));
608 gst_buffer_unref (buf);
609 return GST_FLOW_ERROR;
613 GST_DEBUG_OBJECT (demux, "dropping unexpected RTCP packet");
614 gst_buffer_unref (buf);
619 GST_ELEMENT_ERROR (demux, STREAM, DECODE, (NULL),
620 ("Could not create new pad"));
621 GST_PAD_UNLOCK (demux);
622 gst_buffer_unref (buf);
623 return GST_FLOW_ERROR;
628 gst_rtp_ssrc_demux_src_event (GstPad * pad, GstEvent * event)
630 GstRtpSsrcDemux *demux;
631 const GstStructure *s;
633 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
635 switch (GST_EVENT_TYPE (event)) {
636 case GST_EVENT_CUSTOM_UPSTREAM:
637 case GST_EVENT_CUSTOM_BOTH:
638 case GST_EVENT_CUSTOM_BOTH_OOB:
639 s = gst_event_get_structure (event);
640 if (s && !gst_structure_has_field (s, "ssrc")) {
643 for (walk = demux->srcpads; walk; walk = g_slist_next (walk)) {
644 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) walk->data;
646 if (dpad->rtp_pad == pad || dpad->rtcp_pad == pad) {
648 GST_EVENT_CAST (gst_mini_object_make_writable
649 (GST_MINI_OBJECT_CAST (event)));
650 gst_structure_set (event->structure, "ssrc", G_TYPE_UINT,
661 gst_object_unref (demux);
663 return gst_pad_event_default (pad, event);
667 gst_rtp_ssrc_demux_iterate_internal_links (GstPad * pad)
669 GstRtpSsrcDemux *demux;
670 GstPad *otherpad = NULL;
674 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
676 GST_PAD_LOCK (demux);
677 for (current = demux->srcpads; current; current = g_slist_next (current)) {
678 GstRtpSsrcDemuxPad *dpad = (GstRtpSsrcDemuxPad *) current->data;
680 if (pad == demux->rtp_sink) {
681 otherpad = dpad->rtp_pad;
683 } else if (pad == demux->rtcp_sink) {
684 otherpad = dpad->rtcp_pad;
685 } else if (pad == dpad->rtp_pad) {
686 otherpad = demux->rtp_sink;
688 } else if (pad == dpad->rtcp_pad) {
689 otherpad = demux->rtcp_sink;
693 it = gst_iterator_new_single (GST_TYPE_PAD, otherpad,
694 (GstCopyFunction) gst_object_ref, (GFreeFunc) gst_object_unref);
695 GST_PAD_UNLOCK (demux);
697 gst_object_unref (demux);
702 gst_rtp_ssrc_demux_src_query (GstPad * pad, GstQuery * query)
704 GstRtpSsrcDemux *demux;
705 gboolean res = FALSE;
707 demux = GST_RTP_SSRC_DEMUX (gst_pad_get_parent (pad));
708 if (G_UNLIKELY (demux == NULL))
711 switch (GST_QUERY_TYPE (query)) {
712 case GST_QUERY_LATENCY:
715 if ((res = gst_pad_peer_query (demux->rtp_sink, query))) {
717 GstClockTime min_latency, max_latency;
718 GstRtpSsrcDemuxPad *demuxpad;
720 demuxpad = gst_pad_get_element_private (pad);
722 gst_query_parse_latency (query, &live, &min_latency, &max_latency);
724 GST_DEBUG_OBJECT (demux, "peer min latency %" GST_TIME_FORMAT,
725 GST_TIME_ARGS (min_latency));
727 GST_DEBUG_OBJECT (demux, "latency for SSRC %08x", demuxpad->ssrc);
729 gst_query_set_latency (query, live, min_latency, max_latency);
734 res = gst_pad_query_default (pad, query);
737 gst_object_unref (demux);
742 static GstStateChangeReturn
743 gst_rtp_ssrc_demux_change_state (GstElement * element,
744 GstStateChange transition)
746 GstStateChangeReturn ret;
747 GstRtpSsrcDemux *demux;
749 demux = GST_RTP_SSRC_DEMUX (element);
751 switch (transition) {
752 case GST_STATE_CHANGE_NULL_TO_READY:
753 case GST_STATE_CHANGE_READY_TO_PAUSED:
754 case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
759 ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
761 switch (transition) {
762 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
764 case GST_STATE_CHANGE_PAUSED_TO_READY:
765 gst_rtp_ssrc_demux_reset (demux);
767 case GST_STATE_CHANGE_READY_TO_NULL: