/* RTP muxer element for GStreamer * * gstrtpmux.c: * * Copyright (C) <2007-2010> Nokia Corporation. * Contact: Zeeshan Ali * Copyright (C) <2007-2010> Collabora Ltd * Contact: Olivier Crete * Copyright (C) 1999,2000 Erik Walthinsen * 2000,2005 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-rtpmux * @see_also: rtpdtmfmux * * The rtp muxer takes multiple RTP streams having the same clock-rate and * muxes into a single stream with a single SSRC. * * * Example pipelines * |[ * gst-launch rtpmux name=mux ! udpsink host=127.0.0.1 port=8888 \ * alsasrc ! alawenc ! rtppcmapay ! \ * application/x-rtp, payload=8, rate=8000 ! mux.sink_0 \ * audiotestsrc is-live=1 ! \ * mulawenc ! rtppcmupay ! \ * application/x-rtp, payload=0, rate=8000 ! mux.sink_1 * ]| * In this example, an audio stream is captured from ALSA and another is * generated, both are encoded into different payload types and muxed together * so they can be sent on the same port. * * * Last reviewed on 2010-09-30 (0.10.21) */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include "gstrtpmux.h" GST_DEBUG_CATEGORY_STATIC (gst_rtp_mux_debug); #define GST_CAT_DEFAULT gst_rtp_mux_debug enum { ARG_0, PROP_TIMESTAMP_OFFSET, PROP_SEQNUM_OFFSET, PROP_SEQNUM, PROP_SSRC }; #define DEFAULT_TIMESTAMP_OFFSET -1 #define DEFAULT_SEQNUM_OFFSET -1 #define DEFAULT_SSRC -1 static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("application/x-rtp") ); static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink_%d", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("application/x-rtp") ); static GstPad *gst_rtp_mux_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * name); static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad); static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstBuffer * buffer); static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstBufferList * bufferlist); static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps); static GstCaps *gst_rtp_mux_getcaps (GstPad * pad); static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstEvent * event); static GstStateChangeReturn gst_rtp_mux_change_state (GstElement * element, GstStateChange transition); static void gst_rtp_mux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_rtp_mux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static void gst_rtp_mux_dispose (GObject * object); GST_BOILERPLATE (GstRTPMux, gst_rtp_mux, GstElement, GST_TYPE_ELEMENT); static void gst_rtp_mux_base_init (gpointer g_class) { GstElementClass *element_class = GST_ELEMENT_CLASS (g_class); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&src_factory)); gst_element_class_add_pad_template (element_class, gst_static_pad_template_get (&sink_factory)); gst_element_class_set_details_simple (element_class, "RTP muxer", "Codec/Muxer", "multiplex N rtp streams into one", "Zeeshan Ali "); } static void gst_rtp_mux_class_init (GstRTPMuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gobject_class->get_property = gst_rtp_mux_get_property; gobject_class->set_property = gst_rtp_mux_set_property; gobject_class->dispose = gst_rtp_mux_dispose; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TIMESTAMP_OFFSET, g_param_spec_int ("timestamp-offset", "Timestamp Offset", "Offset to add to all outgoing timestamps (-1 = random)", -1, G_MAXINT, DEFAULT_TIMESTAMP_OFFSET, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM_OFFSET, g_param_spec_int ("seqnum-offset", "Sequence number Offset", "Offset to add to all outgoing seqnum (-1 = random)", -1, G_MAXINT, DEFAULT_SEQNUM_OFFSET, G_PARAM_READWRITE)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SEQNUM, g_param_spec_uint ("seqnum", "Sequence number", "The RTP sequence number of the last processed packet", 0, G_MAXUINT, 0, G_PARAM_READABLE)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC, g_param_spec_uint ("ssrc", "SSRC", "The SSRC of the packets (-1 == random)", 0, G_MAXUINT, DEFAULT_SSRC, G_PARAM_READWRITE)); gstelement_class->request_new_pad = GST_DEBUG_FUNCPTR (gst_rtp_mux_request_new_pad); gstelement_class->release_pad = GST_DEBUG_FUNCPTR (gst_rtp_mux_release_pad); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_rtp_mux_change_state); } static void gst_rtp_mux_dispose (GObject * object) { GList *item; restart: for (item = GST_ELEMENT_PADS (object); item; item = g_list_next (item)) { GstPad *pad = GST_PAD (item->data); if (GST_PAD_IS_SINK (pad)) { gst_element_release_request_pad (GST_ELEMENT (object), pad); goto restart; } } G_OBJECT_CLASS (parent_class)->dispose (object); } static gboolean gst_rtp_mux_src_event (GstPad * pad, GstEvent * event) { GstElement *rtp_mux; GstIterator *iter; GstPad *sinkpad; gboolean result = FALSE; gboolean done = FALSE; rtp_mux = gst_pad_get_parent_element (pad); g_return_val_if_fail (rtp_mux != NULL, FALSE); iter = gst_element_iterate_sink_pads (rtp_mux); while (!done) { switch (gst_iterator_next (iter, (gpointer) & sinkpad)) { case GST_ITERATOR_OK: gst_event_ref (event); result |= gst_pad_push_event (sinkpad, event); gst_object_unref (sinkpad); break; case GST_ITERATOR_RESYNC: gst_iterator_resync (iter); result = FALSE; break; case GST_ITERATOR_ERROR: GST_WARNING_OBJECT (rtp_mux, "Error iterating sinkpads"); case GST_ITERATOR_DONE: done = TRUE; break; } } gst_iterator_free (iter); gst_object_unref (rtp_mux); gst_event_unref (event); return result; } static void gst_rtp_mux_init (GstRTPMux * object, GstRTPMuxClass * g_class) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (object); object->srcpad = gst_pad_new_from_template (gst_element_class_get_pad_template (klass, "src"), "src"); gst_pad_set_event_function (object->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_src_event)); gst_element_add_pad (GST_ELEMENT (object), object->srcpad); object->ssrc = DEFAULT_SSRC; object->ts_offset = DEFAULT_TIMESTAMP_OFFSET; object->seqnum_offset = DEFAULT_SEQNUM_OFFSET; object->segment_pending = TRUE; } static void gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad) { GstRTPMuxClass *klass; GstRTPMuxPadPrivate *padpriv = g_slice_new0 (GstRTPMuxPadPrivate); klass = GST_RTP_MUX_GET_CLASS (rtp_mux); /* setup some pad functions */ gst_pad_set_setcaps_function (sinkpad, gst_rtp_mux_setcaps); gst_pad_set_getcaps_function (sinkpad, gst_rtp_mux_getcaps); gst_pad_set_chain_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_chain)); gst_pad_set_chain_list_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_chain_list)); gst_pad_set_event_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_event)); gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED); gst_pad_set_element_private (sinkpad, padpriv); gst_pad_set_active (sinkpad, TRUE); gst_element_add_pad (GST_ELEMENT (rtp_mux), sinkpad); } static GstPad * gst_rtp_mux_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * req_name) { GstRTPMux *rtp_mux; GstPad *newpad; g_return_val_if_fail (templ != NULL, NULL); g_return_val_if_fail (GST_IS_RTP_MUX (element), NULL); rtp_mux = GST_RTP_MUX (element); if (templ->direction != GST_PAD_SINK) { GST_WARNING_OBJECT (rtp_mux, "request pad that is not a SINK pad"); return NULL; } newpad = gst_pad_new_from_template (templ, req_name); if (newpad) gst_rtp_mux_setup_sinkpad (rtp_mux, newpad); else GST_WARNING_OBJECT (rtp_mux, "failed to create request pad"); return newpad; } static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad) { GstRTPMuxPadPrivate *padpriv; GST_OBJECT_LOCK (element); padpriv = gst_pad_get_element_private (pad); gst_pad_set_element_private (pad, NULL); GST_OBJECT_UNLOCK (element); gst_element_remove_pad (element, pad); if (padpriv) { gst_caps_replace (&padpriv->out_caps, NULL); g_slice_free (GstRTPMuxPadPrivate, padpriv); } } /* Put our own clock-base on the buffer */ static void gst_rtp_mux_readjust_rtp_timestamp_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv, GstBuffer * buffer) { guint32 ts; guint32 sink_ts_base = 0; if (padpriv && padpriv->have_clock_base) sink_ts_base = padpriv->clock_base; ts = gst_rtp_buffer_get_timestamp (buffer) - sink_ts_base + rtp_mux->ts_base; GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u", gst_rtp_buffer_get_timestamp (buffer), ts); gst_rtp_buffer_set_timestamp (buffer, ts); } static gboolean process_buffer_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv, GstBuffer * buffer) { GstRTPMuxClass *klass = GST_RTP_MUX_GET_CLASS (rtp_mux); if (klass->accept_buffer_locked) if (!klass->accept_buffer_locked (rtp_mux, padpriv, buffer)) return FALSE; rtp_mux->seqnum++; gst_rtp_buffer_set_seq (buffer, rtp_mux->seqnum); gst_rtp_buffer_set_ssrc (buffer, rtp_mux->current_ssrc); gst_rtp_mux_readjust_rtp_timestamp_locked (rtp_mux, padpriv, buffer); GST_LOG_OBJECT (rtp_mux, "Pushing packet size %d, seq=%d, ts=%u", GST_BUFFER_SIZE (buffer), rtp_mux->seqnum, gst_rtp_buffer_get_timestamp (buffer)); if (padpriv) { gst_buffer_set_caps (buffer, padpriv->out_caps); if (padpriv->segment.format == GST_FORMAT_TIME) GST_BUFFER_TIMESTAMP (buffer) = gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME, GST_BUFFER_TIMESTAMP (buffer)); } return TRUE; } static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstBufferList * bufferlist) { GstRTPMux *rtp_mux; GstFlowReturn ret; GstBufferListIterator *it; GstRTPMuxPadPrivate *padpriv; GstEvent *newseg_event = NULL; gboolean drop = TRUE; rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad)); if (!gst_rtp_buffer_list_validate (bufferlist)) { GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer"); gst_object_unref (rtp_mux); return GST_FLOW_ERROR; } GST_OBJECT_LOCK (rtp_mux); padpriv = gst_pad_get_element_private (pad); if (!padpriv) { GST_OBJECT_UNLOCK (rtp_mux); ret = GST_FLOW_NOT_LINKED; gst_buffer_list_unref (bufferlist); goto out; } bufferlist = gst_buffer_list_make_writable (bufferlist); it = gst_buffer_list_iterate (bufferlist); while (gst_buffer_list_iterator_next_group (it)) { GstBuffer *rtpbuf; rtpbuf = gst_buffer_list_iterator_next (it); rtpbuf = gst_buffer_make_writable (rtpbuf); drop = !process_buffer_locked (rtp_mux, padpriv, rtpbuf); if (drop) break; gst_buffer_list_iterator_take (it, rtpbuf); } gst_buffer_list_iterator_free (it); if (!drop && rtp_mux->segment_pending) { /* * We set the start at 0, because we re-timestamps to the running time */ newseg_event = gst_event_new_new_segment_full (FALSE, 1.0, 1.0, GST_FORMAT_TIME, 0, -1, 0); rtp_mux->segment_pending = FALSE; } GST_OBJECT_UNLOCK (rtp_mux); if (newseg_event) gst_pad_push_event (rtp_mux->srcpad, newseg_event); if (drop) { gst_buffer_list_unref (bufferlist); ret = GST_FLOW_OK; } else { ret = gst_pad_push_list (rtp_mux->srcpad, bufferlist); } out: gst_object_unref (rtp_mux); return ret; } static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstBuffer * buffer) { GstRTPMux *rtp_mux; GstFlowReturn ret; GstRTPMuxPadPrivate *padpriv; GstEvent *newseg_event = NULL; gboolean drop; rtp_mux = GST_RTP_MUX (GST_OBJECT_PARENT (pad)); if (!gst_rtp_buffer_validate (buffer)) { gst_buffer_unref (buffer); GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer"); return GST_FLOW_ERROR; } GST_OBJECT_LOCK (rtp_mux); padpriv = gst_pad_get_element_private (pad); if (!padpriv) { GST_OBJECT_UNLOCK (rtp_mux); gst_buffer_unref (buffer); return GST_FLOW_NOT_LINKED; } buffer = gst_buffer_make_writable (buffer); drop = !process_buffer_locked (rtp_mux, padpriv, buffer); if (!drop && rtp_mux->segment_pending) { /* * We set the start at 0, because we re-timestamps to the running time */ newseg_event = gst_event_new_new_segment_full (FALSE, 1.0, 1.0, GST_FORMAT_TIME, 0, -1, 0); rtp_mux->segment_pending = FALSE; } GST_OBJECT_UNLOCK (rtp_mux); if (newseg_event) gst_pad_push_event (rtp_mux->srcpad, newseg_event); if (drop) { gst_buffer_unref (buffer); ret = GST_FLOW_OK; } else { ret = gst_pad_push (rtp_mux->srcpad, buffer); } return ret; } static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstCaps * caps) { GstRTPMux *rtp_mux; GstStructure *structure; gboolean ret = FALSE; GstRTPMuxPadPrivate *padpriv; rtp_mux = GST_RTP_MUX (gst_pad_get_parent (pad)); structure = gst_caps_get_structure (caps, 0); if (!structure) goto out; GST_OBJECT_LOCK (rtp_mux); padpriv = gst_pad_get_element_private (pad); if (padpriv && gst_structure_get_uint (structure, "clock-base", &padpriv->clock_base)) { padpriv->have_clock_base = TRUE; } GST_OBJECT_UNLOCK (rtp_mux); caps = gst_caps_copy (caps); gst_caps_set_simple (caps, "clock-base", G_TYPE_UINT, rtp_mux->ts_base, "seqnum-base", G_TYPE_UINT, rtp_mux->seqnum_base, NULL); GST_DEBUG_OBJECT (rtp_mux, "setting caps %" GST_PTR_FORMAT " on src pad..", caps); ret = gst_pad_set_caps (rtp_mux->srcpad, caps); if (rtp_mux->ssrc == -1) { if (gst_structure_has_field_typed (structure, "ssrc", G_TYPE_UINT)) { rtp_mux->current_ssrc = g_value_get_uint (gst_structure_get_value (structure, "ssrc")); } } if (ret) { GST_OBJECT_LOCK (rtp_mux); padpriv = gst_pad_get_element_private (pad); if (padpriv) gst_caps_replace (&padpriv->out_caps, caps); GST_OBJECT_UNLOCK (rtp_mux); } gst_caps_unref (caps); out: gst_object_unref (rtp_mux); return ret; } static void clear_caps (GstCaps * caps, gboolean only_clock_rate) { gint i, j; /* Lets only match on the clock-rate */ for (i = 0; i < gst_caps_get_size (caps); i++) { GstStructure *s = gst_caps_get_structure (caps, i); for (j = 0; j < gst_structure_n_fields (s); j++) { const gchar *name = gst_structure_nth_field_name (s, j); if (strcmp (name, "clock-rate") && (only_clock_rate || (strcmp (name, "ssrc")))) { gst_structure_remove_field (s, name); j--; } } } } static gboolean same_clock_rate_fold (gpointer item, GValue * ret, gpointer user_data) { GstPad *mypad = user_data; GstPad *pad = item; GstCaps *peercaps; GstCaps *othercaps; const GstCaps *accumcaps; GstCaps *intersect; if (pad == mypad) { gst_object_unref (pad); return TRUE; } peercaps = gst_pad_peer_get_caps (pad); if (!peercaps) { gst_object_unref (pad); return TRUE; } othercaps = gst_caps_intersect (peercaps, gst_pad_get_pad_template_caps (pad)); gst_caps_unref (peercaps); accumcaps = gst_value_get_caps (ret); clear_caps (othercaps, TRUE); intersect = gst_caps_intersect (accumcaps, othercaps); g_value_take_boxed (ret, intersect); gst_caps_unref (othercaps); gst_object_unref (pad); return !gst_caps_is_empty (intersect); } static GstCaps * gst_rtp_mux_getcaps (GstPad * pad) { GstRTPMux *mux = GST_RTP_MUX (gst_pad_get_parent (pad)); GstCaps *caps = NULL; GstIterator *iter = NULL; GValue v = { 0 }; GstIteratorResult res; GstCaps *peercaps = gst_pad_peer_get_caps (mux->srcpad); GstCaps *othercaps = NULL; if (peercaps) { othercaps = gst_caps_intersect (peercaps, gst_pad_get_pad_template_caps (pad)); gst_caps_unref (peercaps); } else { othercaps = gst_caps_copy (gst_pad_get_pad_template_caps (mux->srcpad)); } clear_caps (othercaps, FALSE); g_value_init (&v, GST_TYPE_CAPS); iter = gst_element_iterate_sink_pads (GST_ELEMENT (mux)); do { gst_value_set_caps (&v, othercaps); res = gst_iterator_fold (iter, same_clock_rate_fold, &v, pad); } while (res == GST_ITERATOR_RESYNC); gst_iterator_free (iter); caps = (GstCaps *) gst_value_get_caps (&v); if (res == GST_ITERATOR_ERROR) { gst_caps_unref (caps); caps = gst_caps_new_empty (); } if (othercaps) gst_caps_unref (othercaps); gst_object_unref (mux); return caps; } static void gst_rtp_mux_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstRTPMux *rtp_mux; rtp_mux = GST_RTP_MUX (object); switch (prop_id) { case PROP_TIMESTAMP_OFFSET: g_value_set_int (value, rtp_mux->ts_offset); break; case PROP_SEQNUM_OFFSET: g_value_set_int (value, rtp_mux->seqnum_offset); break; case PROP_SEQNUM: GST_OBJECT_LOCK (rtp_mux); g_value_set_uint (value, rtp_mux->seqnum); GST_OBJECT_UNLOCK (rtp_mux); break; case PROP_SSRC: g_value_set_uint (value, rtp_mux->ssrc); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_rtp_mux_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstRTPMux *rtp_mux; rtp_mux = GST_RTP_MUX (object); switch (prop_id) { case PROP_TIMESTAMP_OFFSET: rtp_mux->ts_offset = g_value_get_int (value); break; case PROP_SEQNUM_OFFSET: rtp_mux->seqnum_offset = g_value_get_int (value); break; case PROP_SSRC: rtp_mux->ssrc = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstEvent * event) { GstRTPMux *mux; gboolean ret = FALSE; gboolean forward = TRUE; mux = GST_RTP_MUX (gst_pad_get_parent (pad)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_FLUSH_STOP: { GstRTPMuxPadPrivate *padpriv; GST_OBJECT_LOCK (mux); mux->segment_pending = TRUE; padpriv = gst_pad_get_element_private (pad); if (padpriv) gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED); GST_OBJECT_UNLOCK (mux); } break; case GST_EVENT_NEWSEGMENT: { gboolean update; gdouble rate, applied_rate; GstFormat format; gint64 start, stop, position; GstRTPMuxPadPrivate *padpriv; gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate, &format, &start, &stop, &position); GST_OBJECT_LOCK (mux); padpriv = gst_pad_get_element_private (pad); if (padpriv) { if (format == GST_FORMAT_TIME) gst_segment_set_newsegment_full (&padpriv->segment, update, rate, applied_rate, format, start, stop, position); else gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED); } GST_OBJECT_UNLOCK (mux); gst_event_unref (event); forward = FALSE; ret = TRUE; break; } default: break; } if (forward) ret = gst_pad_push_event (mux->srcpad, event); gst_object_unref (mux); return ret; } static void clear_segment (gpointer data, gpointer user_data) { GstPad *pad = data; GstRTPMux *mux = user_data; GstRTPMuxPadPrivate *padpriv; GST_OBJECT_LOCK (mux); padpriv = gst_pad_get_element_private (pad); if (padpriv) gst_segment_init (&padpriv->segment, GST_FORMAT_UNDEFINED); GST_OBJECT_UNLOCK (mux); gst_object_unref (pad); } static void gst_rtp_mux_ready_to_paused (GstRTPMux * rtp_mux) { GstIterator *iter; iter = gst_element_iterate_sink_pads (GST_ELEMENT (rtp_mux)); while (gst_iterator_foreach (iter, clear_segment, rtp_mux) == GST_ITERATOR_RESYNC); gst_iterator_free (iter); GST_OBJECT_LOCK (rtp_mux); rtp_mux->segment_pending = TRUE; if (rtp_mux->ssrc == -1) rtp_mux->current_ssrc = g_random_int (); else rtp_mux->current_ssrc = rtp_mux->ssrc; if (rtp_mux->seqnum_offset == -1) rtp_mux->seqnum_base = g_random_int_range (0, G_MAXUINT16); else rtp_mux->seqnum_base = rtp_mux->seqnum_offset; rtp_mux->seqnum = rtp_mux->seqnum_base; if (rtp_mux->ts_offset == -1) rtp_mux->ts_base = g_random_int (); else rtp_mux->ts_base = rtp_mux->ts_offset; GST_DEBUG_OBJECT (rtp_mux, "set clock-base to %u", rtp_mux->ts_base); GST_OBJECT_UNLOCK (rtp_mux); } static GstStateChangeReturn gst_rtp_mux_change_state (GstElement * element, GstStateChange transition) { GstRTPMux *rtp_mux; rtp_mux = GST_RTP_MUX (element); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY: break; case GST_STATE_CHANGE_READY_TO_PAUSED: gst_rtp_mux_ready_to_paused (rtp_mux); break; case GST_STATE_CHANGE_PAUSED_TO_READY: break; default: break; } return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); } gboolean gst_rtp_mux_plugin_init (GstPlugin * plugin) { GST_DEBUG_CATEGORY_INIT (gst_rtp_mux_debug, "rtpmux", 0, "rtp muxer"); return gst_element_register (plugin, "rtpmux", GST_RANK_NONE, GST_TYPE_RTP_MUX); }