1 /* RTP muxer element for GStreamer
5 * Copyright (C) <2007-2010> Nokia Corporation.
6 * Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
7 * Copyright (C) <2007-2010> Collabora Ltd
8 * Contact: Olivier Crete <olivier.crete@collabora.co.uk>
9 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
10 * 2000,2005 Wim Taymans <wim@fluendo.com>
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Library General Public
14 * License as published by the Free Software Foundation; either
15 * version 2 of the License, or (at your option) any later version.
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with this library; if not, write to the
24 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
25 * Boston, MA 02110-1301, USA.
29 * SECTION:element-rtpmux
30 * @see_also: rtpdtmfmux
32 * The rtp muxer takes multiple RTP streams having the same clock-rate and
33 * muxes into a single stream with a single SSRC.
36 * <title>Example pipelines</title>
38 * gst-launch rtpmux name=mux ! udpsink host=127.0.0.1 port=8888 \
39 * alsasrc ! alawenc ! rtppcmapay ! \
40 * application/x-rtp, payload=8, rate=8000 ! mux.sink_0 \
41 * audiotestsrc is-live=1 ! \
42 * mulawenc ! rtppcmupay ! \
43 * application/x-rtp, payload=0, rate=8000 ! mux.sink_1
45 * In this example, an audio stream is captured from ALSA and another is
46 * generated, both are encoded into different payload types and muxed together
47 * so they can be sent on the same port.
56 #include <gst/rtp/gstrtpbuffer.h>
59 #include "gstrtpmux.h"
61 GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug);
62 #define GST_CAT_DEFAULT gst_rtp_mux_debug
67 PROP_TIMESTAMP_OFFSET,
73 #define DEFAULT_TIMESTAMP_OFFSET -1
74 #define DEFAULT_SEQNUM_OFFSET -1
75 #define DEFAULT_SSRC -1
77 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
80 GST_STATIC_CAPS ("application/x-rtp")
83 static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%u",
86 GST_STATIC_CAPS ("application/x-rtp")
89 static GstPad *gst_rtp_mux_request_new_pad (GstElement * element,
90 GstPadTemplate * templ, const gchar * name, const GstCaps * caps);
91 static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad);
92 static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstObject * parent,
94 static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent,
95 GstBufferList * bufferlist);
96 static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux,
98 static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent,
100 static gboolean gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent,
103 static GstStateChangeReturn gst_rtp_mux_change_state (GstElement *
104 element, GstStateChange transition);
106 static void gst_rtp_mux_set_property (GObject * object, guint prop_id,
107 const GValue * value, GParamSpec * pspec);
108 static void gst_rtp_mux_get_property (GObject * object, guint prop_id,
109 GValue * value, GParamSpec * pspec);
110 static void gst_rtp_mux_dispose (GObject * object);
112 static gboolean gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux,
115 G_DEFINE_TYPE (GstRTPMux, gst_rtp_mux, GST_TYPE_ELEMENT);
119 gst_rtp_mux_class_init (GstRTPMuxClass * klass)
121 GObjectClass *gobject_class;
122 GstElementClass *gstelement_class;
124 gobject_class = (GObjectClass *) klass;
125 gstelement_class = (GstElementClass *) klass;
128 gst_element_class_add_pad_template (gstelement_class,
129 gst_static_pad_template_get (&src_factory));
130 gst_element_class_add_pad_template (gstelement_class,
131 gst_static_pad_template_get (&sink_factory));
133 gst_element_class_set_static_metadata (gstelement_class, "RTP muxer",
135 "multiplex N rtp streams into one", "Zeeshan Ali <first.last@nokia.com>");
137 gobject_class->get_property = gst_rtp_mux_get_property;
138 gobject_class->set_property = gst_rtp_mux_set_property;
139 gobject_class->dispose = gst_rtp_mux_dispose;
141 klass->src_event = gst_rtp_mux_src_event_real;
143 g_object_class_install_property (G_OBJECT_CLASS (klass),
144 PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset",
146 "Offset to add to all outgoing timestamps (-1 = random)", -1,
147 G_MAXINT, DEFAULT_TIMESTAMP_OFFSET,
148 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
149 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET,
150 g_param_spec_int ("seqnum-offset", "Sequence number Offset",
151 "Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT,
152 DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
153 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM,
154 g_param_spec_uint ("seqnum", "Sequence number",
155 "The RTP sequence number of the last processed packet",
156 0, G_MAXUINT, 0, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
157 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC,
158 g_param_spec_uint ("ssrc", "SSRC",
159 "The SSRC of the packets (-1 == random)",
160 0, G_MAXUINT, DEFAULT_SSRC,
161 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
163 gstelement_class->request_new_pad =
164 GST_DEBUG_FUNCPTR (gst_rtp_mux_request_new_pad);
165 gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_rtp_mux_release_pad);
166 gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_mux_change_state);
170 gst_rtp_mux_dispose (GObject * object)
172 GstRTPMux *rtp_mux = GST_RTP_MUX (object);
175 g_clear_object (&rtp_mux->last_pad);
178 for (item = GST_ELEMENT_PADS (object); item; item = g_list_next (item)) {
179 GstPad *pad = GST_PAD (item->data);
180 if (GST_PAD_IS_SINK (pad)) {
181 gst_element_release_request_pad (GST_ELEMENT (object), pad);
186 G_OBJECT_CLASS (gst_rtp_mux_parent_class)->dispose (object);
190 gst_rtp_mux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
192 GstRTPMux *rtp_mux = GST_RTP_MUX (parent);
193 GstRTPMuxClass *klass;
194 gboolean ret = FALSE;
196 klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
198 ret = klass->src_event (rtp_mux, event);
204 gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux, GstEvent * event)
207 gboolean result = FALSE;
208 gboolean done = FALSE;
210 iter = gst_element_iterate_sink_pads (GST_ELEMENT (rtp_mux));
213 GValue item = { 0, };
215 switch (gst_iterator_next (iter, &item)) {
216 case GST_ITERATOR_OK:
217 gst_event_ref (event);
218 result |= gst_pad_push_event (g_value_get_object (&item), event);
219 g_value_reset (&item);
221 case GST_ITERATOR_RESYNC:
222 gst_iterator_resync (iter);
225 case GST_ITERATOR_ERROR:
226 GST_WARNING_OBJECT (rtp_mux, "Error iterating sinkpads");
227 case GST_ITERATOR_DONE:
232 gst_iterator_free (iter);
233 gst_event_unref (event);
239 gst_rtp_mux_init (GstRTPMux * rtp_mux)
241 GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtp_mux);
244 gst_pad_new_from_template (gst_element_class_get_pad_template (klass,
246 gst_pad_set_event_function (rtp_mux->srcpad,
247 GST_DEBUG_FUNCPTR (gst_rtp_mux_src_event));
248 GST_PAD_SET_PROXY_CAPS (rtp_mux->srcpad);
249 gst_element_add_pad (GST_ELEMENT (rtp_mux), rtp_mux->srcpad);
251 rtp_mux->ssrc = DEFAULT_SSRC;
252 rtp_mux->ts_offset = DEFAULT_TIMESTAMP_OFFSET;
253 rtp_mux->seqnum_offset = DEFAULT_SEQNUM_OFFSET;
255 rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
259 gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad)
261 GstRTPMuxPadPrivate *padpriv = g_slice_new0 (GstRTPMuxPadPrivate);
263 /* setup some pad functions */
264 gst_pad_set_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_chain));
265 gst_pad_set_chain_list_function (sinkpad,
266 GST_DEBUG_FUNCPTR (gst_rtp_mux_chain_list));
267 gst_pad_set_event_function (sinkpad,
268 GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_event));
269 gst_pad_set_query_function (sinkpad,
270 GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_query));
273 gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED);
275 gst_pad_set_element_private (sinkpad, padpriv);
277 gst_pad_set_active (sinkpad, TRUE);
278 gst_element_add_pad (GST_ELEMENT (rtp_mux), sinkpad);
282 gst_rtp_mux_request_new_pad (GstElement * element,
283 GstPadTemplate * templ, const gchar * req_name, const GstCaps * caps)
288 g_return_val_if_fail (templ != NULL, NULL);
289 g_return_val_if_fail (GST_IS_RTP_MUX (element), NULL);
291 rtp_mux = GST_RTP_MUX (element);
293 if (templ->direction != GST_PAD_SINK) {
294 GST_WARNING_OBJECT (rtp_mux, "request pad that is not a SINK pad");
298 newpad = gst_pad_new_from_template (templ, req_name);
300 gst_rtp_mux_setup_sinkpad (rtp_mux, newpad);
302 GST_WARNING_OBJECT (rtp_mux, "failed to create request pad");
308 gst_rtp_mux_release_pad (GstElement * element, GstPad * pad)
310 GstRTPMuxPadPrivate *padpriv;
312 GST_OBJECT_LOCK (element);
313 padpriv = gst_pad_get_element_private (pad);
314 gst_pad_set_element_private (pad, NULL);
315 GST_OBJECT_UNLOCK (element);
317 gst_element_remove_pad (element, pad);
320 g_slice_free (GstRTPMuxPadPrivate, padpriv);
324 /* Put our own clock-base on the buffer */
326 gst_rtp_mux_readjust_rtp_timestamp_locked (GstRTPMux * rtp_mux,
327 GstRTPMuxPadPrivate * padpriv, GstRTPBuffer * rtpbuffer)
330 guint32 sink_ts_base = 0;
332 if (padpriv && padpriv->have_clock_base)
333 sink_ts_base = padpriv->clock_base;
335 ts = gst_rtp_buffer_get_timestamp (rtpbuffer) - sink_ts_base +
337 GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u",
338 gst_rtp_buffer_get_timestamp (rtpbuffer), ts);
339 gst_rtp_buffer_set_timestamp (rtpbuffer, ts);
343 process_buffer_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv,
344 GstRTPBuffer * rtpbuffer)
346 GstRTPMuxClass *klass = GST_RTP_MUX_GET_CLASS (rtp_mux);
348 if (klass->accept_buffer_locked)
349 if (!klass->accept_buffer_locked (rtp_mux, padpriv, rtpbuffer))
353 gst_rtp_buffer_set_seq (rtpbuffer, rtp_mux->seqnum);
355 gst_rtp_buffer_set_ssrc (rtpbuffer, rtp_mux->current_ssrc);
356 gst_rtp_mux_readjust_rtp_timestamp_locked (rtp_mux, padpriv, rtpbuffer);
357 GST_LOG_OBJECT (rtp_mux,
358 "Pushing packet size %" G_GSIZE_FORMAT ", seq=%d, ts=%u",
359 rtpbuffer->map[0].size, rtp_mux->seqnum,
360 gst_rtp_buffer_get_timestamp (rtpbuffer));
363 if (padpriv->segment.format == GST_FORMAT_TIME)
364 GST_BUFFER_PTS (rtpbuffer->buffer) =
365 gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME,
366 GST_BUFFER_PTS (rtpbuffer->buffer));
372 struct BufferListData
375 GstRTPMuxPadPrivate *padpriv;
380 process_list_item (GstBuffer ** buffer, guint idx, gpointer user_data)
382 struct BufferListData *bd = user_data;
383 GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
385 *buffer = gst_buffer_make_writable (*buffer);
387 gst_rtp_buffer_map (*buffer, GST_MAP_READWRITE, &rtpbuffer);
389 bd->drop = !process_buffer_locked (bd->rtp_mux, bd->padpriv, &rtpbuffer);
391 gst_rtp_buffer_unmap (&rtpbuffer);
396 if (GST_BUFFER_DURATION_IS_VALID (*buffer) &&
397 GST_BUFFER_TIMESTAMP_IS_VALID (*buffer))
398 bd->rtp_mux->last_stop = GST_BUFFER_TIMESTAMP (*buffer) +
399 GST_BUFFER_DURATION (*buffer);
401 bd->rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
407 gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent,
408 GstBufferList * bufferlist)
412 GstRTPMuxPadPrivate *padpriv;
413 struct BufferListData bd;
415 rtp_mux = GST_RTP_MUX (parent);
417 GST_OBJECT_LOCK (rtp_mux);
419 padpriv = gst_pad_get_element_private (pad);
421 GST_OBJECT_UNLOCK (rtp_mux);
422 ret = GST_FLOW_NOT_LINKED;
423 gst_buffer_list_unref (bufferlist);
427 bd.rtp_mux = rtp_mux;
428 bd.padpriv = padpriv;
431 bufferlist = gst_buffer_list_make_writable (bufferlist);
432 gst_buffer_list_foreach (bufferlist, process_list_item, &bd);
434 GST_OBJECT_UNLOCK (rtp_mux);
437 gst_buffer_list_unref (bufferlist);
440 ret = gst_pad_push_list (rtp_mux->srcpad, bufferlist);
449 resend_events (GstPad * pad, GstEvent ** event, gpointer user_data)
451 GstRTPMux *rtp_mux = user_data;
453 if (GST_EVENT_TYPE (*event) == GST_EVENT_CAPS) {
456 gst_event_parse_caps (*event, &caps);
457 gst_rtp_mux_setcaps (pad, rtp_mux, caps);
459 gst_pad_push_event (rtp_mux->srcpad, gst_event_ref (*event));
466 gst_rtp_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer)
470 GstRTPMuxPadPrivate *padpriv;
472 gboolean changed = FALSE;
473 GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT;
475 rtp_mux = GST_RTP_MUX (GST_OBJECT_PARENT (pad));
477 GST_OBJECT_LOCK (rtp_mux);
478 padpriv = gst_pad_get_element_private (pad);
481 GST_OBJECT_UNLOCK (rtp_mux);
482 gst_buffer_unref (buffer);
483 return GST_FLOW_NOT_LINKED;
486 buffer = gst_buffer_make_writable (buffer);
488 if (!gst_rtp_buffer_map (buffer, GST_MAP_READWRITE, &rtpbuffer)) {
489 GST_OBJECT_UNLOCK (rtp_mux);
490 gst_buffer_unref (buffer);
491 GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer");
492 return GST_FLOW_ERROR;
495 drop = !process_buffer_locked (rtp_mux, padpriv, &rtpbuffer);
497 gst_rtp_buffer_unmap (&rtpbuffer);
500 if (pad != rtp_mux->last_pad) {
502 g_clear_object (&rtp_mux->last_pad);
503 rtp_mux->last_pad = g_object_ref (pad);
506 if (GST_BUFFER_DURATION_IS_VALID (buffer) &&
507 GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
508 rtp_mux->last_stop = GST_BUFFER_TIMESTAMP (buffer) +
509 GST_BUFFER_DURATION (buffer);
511 rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
514 GST_OBJECT_UNLOCK (rtp_mux);
517 gst_pad_sticky_events_foreach (pad, resend_events, rtp_mux);
520 gst_buffer_unref (buffer);
523 ret = gst_pad_push (rtp_mux->srcpad, buffer);
530 gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux, GstCaps * caps)
532 GstStructure *structure;
533 gboolean ret = FALSE;
534 GstRTPMuxPadPrivate *padpriv;
536 structure = gst_caps_get_structure (caps, 0);
541 GST_OBJECT_LOCK (rtp_mux);
542 padpriv = gst_pad_get_element_private (pad);
544 gst_structure_get_uint (structure, "clock-base", &padpriv->clock_base)) {
545 padpriv->have_clock_base = TRUE;
547 GST_OBJECT_UNLOCK (rtp_mux);
549 caps = gst_caps_copy (caps);
551 gst_caps_set_simple (caps,
552 "clock-base", G_TYPE_UINT, rtp_mux->ts_base,
553 "seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base, NULL);
555 if (rtp_mux->send_stream_start) {
558 /* stream-start (FIXME: create id based on input ids) */
559 g_snprintf (s_id, sizeof (s_id), "interleave-%08x", g_random_int ());
560 gst_pad_push_event (rtp_mux->srcpad, gst_event_new_stream_start (s_id));
562 rtp_mux->send_stream_start = FALSE;
565 GST_DEBUG_OBJECT (rtp_mux,
566 "setting caps %" GST_PTR_FORMAT " on src pad..", caps);
567 ret = gst_pad_set_caps (rtp_mux->srcpad, caps);
569 gst_structure_get_uint (structure, "ssrc", &rtp_mux->current_ssrc);
571 gst_caps_unref (caps);
577 clear_caps (GstCaps * caps, gboolean only_clock_rate)
581 /* Lets only match on the clock-rate */
582 for (i = 0; i < gst_caps_get_size (caps); i++) {
583 GstStructure *s = gst_caps_get_structure (caps, i);
585 for (j = 0; j < gst_structure_n_fields (s); j++) {
586 const gchar *name = gst_structure_nth_field_name (s, j);
588 if (strcmp (name, "clock-rate") && (only_clock_rate ||
589 (strcmp (name, "ssrc")))) {
590 gst_structure_remove_field (s, name);
598 same_clock_rate_fold (const GValue * item, GValue * ret, gpointer user_data)
600 GstPad *mypad = user_data;
601 GstPad *pad = g_value_get_object (item);
609 accumcaps = g_value_get_boxed (ret);
610 peercaps = gst_pad_peer_query_caps (pad, accumcaps);
612 g_warning ("no peercaps");
615 peercaps = gst_caps_make_writable (peercaps);
616 clear_caps (peercaps, TRUE);
618 intersect = gst_caps_intersect (accumcaps, peercaps);
620 g_value_take_boxed (ret, intersect);
621 gst_caps_unref (peercaps);
623 return !gst_caps_is_empty (intersect);
627 gst_rtp_mux_getcaps (GstPad * pad, GstRTPMux * mux, GstCaps * filter)
629 GstCaps *caps = NULL;
630 GstIterator *iter = NULL;
632 GstIteratorResult res;
637 peercaps = gst_pad_peer_query_caps (mux->srcpad, filter);
640 tcaps = gst_pad_get_pad_template_caps (pad);
641 othercaps = gst_caps_intersect_full (peercaps, tcaps,
642 GST_CAPS_INTERSECT_FIRST);
643 gst_caps_unref (peercaps);
645 tcaps = gst_pad_get_pad_template_caps (mux->srcpad);
647 othercaps = gst_caps_intersect_full (filter, tcaps,
648 GST_CAPS_INTERSECT_FIRST);
650 othercaps = gst_caps_copy (tcaps);
652 gst_caps_unref (tcaps);
654 clear_caps (othercaps, FALSE);
656 g_value_init (&v, GST_TYPE_CAPS);
658 iter = gst_element_iterate_sink_pads (GST_ELEMENT (mux));
660 gst_value_set_caps (&v, othercaps);
661 res = gst_iterator_fold (iter, same_clock_rate_fold, &v, pad);
662 gst_iterator_resync (iter);
663 } while (res == GST_ITERATOR_RESYNC);
664 gst_iterator_free (iter);
666 caps = (GstCaps *) gst_value_get_caps (&v);
668 if (res == GST_ITERATOR_ERROR) {
669 gst_caps_unref (caps);
670 caps = gst_caps_new_empty ();
673 gst_caps_unref (othercaps);
679 gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
681 GstRTPMux *mux = GST_RTP_MUX (parent);
682 gboolean res = FALSE;
684 switch (GST_QUERY_TYPE (query)) {
687 GstCaps *filter, *caps;
689 gst_query_parse_caps (query, &filter);
690 caps = gst_rtp_mux_getcaps (pad, mux, filter);
691 gst_query_set_caps_result (query, caps);
692 gst_caps_unref (caps);
697 res = gst_pad_query_default (pad, parent, query);
708 gst_rtp_mux_get_property (GObject * object,
709 guint prop_id, GValue * value, GParamSpec * pspec)
713 rtp_mux = GST_RTP_MUX (object);
716 case PROP_TIMESTAMP_OFFSET:
717 g_value_set_int (value, rtp_mux->ts_offset);
719 case PROP_SEQNUM_OFFSET:
720 g_value_set_int (value, rtp_mux->seqnum_offset);
723 GST_OBJECT_LOCK (rtp_mux);
724 g_value_set_uint (value, rtp_mux->seqnum);
725 GST_OBJECT_UNLOCK (rtp_mux);
728 g_value_set_uint (value, rtp_mux->ssrc);
731 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
737 gst_rtp_mux_set_property (GObject * object,
738 guint prop_id, const GValue * value, GParamSpec * pspec)
742 rtp_mux = GST_RTP_MUX (object);
745 case PROP_TIMESTAMP_OFFSET:
746 rtp_mux->ts_offset = g_value_get_int (value);
748 case PROP_SEQNUM_OFFSET:
749 rtp_mux->seqnum_offset = g_value_get_int (value);
752 rtp_mux->ssrc = g_value_get_uint (value);
755 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
761 gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
763 GstRTPMux *mux = GST_RTP_MUX (parent);
767 switch (GST_EVENT_TYPE (event)) {
772 gst_event_parse_caps (event, &caps);
773 ret = gst_rtp_mux_setcaps (pad, mux, caps);
774 gst_event_unref (event);
777 case GST_EVENT_FLUSH_STOP:
779 GST_OBJECT_LOCK (mux);
780 mux->last_stop = GST_CLOCK_TIME_NONE;
781 GST_OBJECT_UNLOCK (mux);
784 case GST_EVENT_SEGMENT:
786 GstRTPMuxPadPrivate *padpriv;
788 GST_OBJECT_LOCK (mux);
789 padpriv = gst_pad_get_element_private (pad);
792 gst_event_copy_segment (event, &padpriv->segment);
794 GST_OBJECT_UNLOCK (mux);
801 GST_OBJECT_LOCK (mux);
802 is_pad = (pad == mux->last_pad);
803 GST_OBJECT_UNLOCK (mux);
806 return gst_pad_push_event (mux->srcpad, event);
808 gst_event_unref (event);
814 gst_rtp_mux_ready_to_paused (GstRTPMux * rtp_mux)
817 GST_OBJECT_LOCK (rtp_mux);
819 g_clear_object (&rtp_mux->last_pad);
820 rtp_mux->send_stream_start = TRUE;
822 if (rtp_mux->ssrc == -1)
823 rtp_mux->current_ssrc = g_random_int ();
825 rtp_mux->current_ssrc = rtp_mux->ssrc;
827 if (rtp_mux->seqnum_offset == -1)
828 rtp_mux->seqnum_base = g_random_int_range (0, G_MAXUINT16);
830 rtp_mux->seqnum_base = rtp_mux->seqnum_offset;
831 rtp_mux->seqnum = rtp_mux->seqnum_base;
833 if (rtp_mux->ts_offset == -1)
834 rtp_mux->ts_base = g_random_int ();
836 rtp_mux->ts_base = rtp_mux->ts_offset;
838 rtp_mux->last_stop = GST_CLOCK_TIME_NONE;
840 GST_DEBUG_OBJECT (rtp_mux, "set clock-base to %u", rtp_mux->ts_base);
842 GST_OBJECT_UNLOCK (rtp_mux);
845 static GstStateChangeReturn
846 gst_rtp_mux_change_state (GstElement * element, GstStateChange transition)
849 GstStateChangeReturn ret;
851 rtp_mux = GST_RTP_MUX (element);
853 switch (transition) {
854 case GST_STATE_CHANGE_READY_TO_PAUSED:
855 gst_rtp_mux_ready_to_paused (rtp_mux);
861 ret = GST_ELEMENT_CLASS (gst_rtp_mux_parent_class)->change_state (element,
864 switch (transition) {
865 case GST_STATE_CHANGE_PAUSED_TO_READY:
866 g_clear_object (&rtp_mux->last_pad);
876 gst_rtp_mux_plugin_init (GstPlugin * plugin)
878 GST_DEBUG_CATEGORY_INIT (gst_rtp_mux_debug, "rtpmux", 0, "rtp muxer");
880 return gst_element_register (plugin, "rtpmux", GST_RANK_NONE,