/* 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /** * SECTION:element-rtpmux * @title: 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-1.0 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. * */ #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 { PROP_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_%u", 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, const GstCaps * caps); static void gst_rtp_mux_release_pad (GstElement * element, GstPad * pad); static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer); static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent, GstBufferList * bufferlist); static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux, GstCaps * caps); static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event); static gboolean gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query); 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); static gboolean gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux, GstEvent * event); G_DEFINE_TYPE_WITH_CODE (GstRTPMux, gst_rtp_mux, GST_TYPE_ELEMENT, GST_DEBUG_CATEGORY_INIT (gst_rtp_mux_debug, "rtpmux", 0, "rtp muxer")); GST_ELEMENT_REGISTER_DEFINE (rtpmux, "rtpmux", GST_RANK_NONE, GST_TYPE_RTP_MUX); static void gst_rtp_mux_class_init (GstRTPMuxClass * klass) { GObjectClass *gobject_class; GstElementClass *gstelement_class; gobject_class = (GObjectClass *) klass; gstelement_class = (GstElementClass *) klass; gst_element_class_add_static_pad_template (gstelement_class, &src_factory); gst_element_class_add_static_pad_template (gstelement_class, &sink_factory); gst_element_class_set_static_metadata (gstelement_class, "RTP muxer", "Codec/Muxer", "multiplex N rtp streams into one", "Zeeshan Ali "); 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; klass->src_event = gst_rtp_mux_src_event_real; 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_PARAM_STATIC_STRINGS)); 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_PARAM_STATIC_STRINGS)); 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_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_SSRC, g_param_spec_uint ("ssrc", "SSRC", "The SSRC of the packets (default == random)", 0, G_MAXUINT, DEFAULT_SSRC, GST_PARAM_MUTABLE_PLAYING | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); 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); gst_type_mark_as_plugin_api (GST_TYPE_RTP_MUX, 0); } static void gst_rtp_mux_dispose (GObject * object) { GstRTPMux *rtp_mux = GST_RTP_MUX (object); GList *item; g_clear_object (&rtp_mux->last_pad); 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 (gst_rtp_mux_parent_class)->dispose (object); } static gboolean gst_rtp_mux_src_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstRTPMux *rtp_mux = GST_RTP_MUX (parent); GstRTPMuxClass *klass; gboolean ret; klass = GST_RTP_MUX_GET_CLASS (rtp_mux); ret = klass->src_event (rtp_mux, event); return ret; } static gboolean gst_rtp_mux_src_event_real (GstRTPMux * rtp_mux, GstEvent * event) { switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CUSTOM_UPSTREAM: { const GstStructure *s = gst_event_get_structure (event); if (gst_structure_has_name (s, "GstRTPCollision")) { guint ssrc = 0; if (!gst_structure_get_uint (s, "ssrc", &ssrc)) ssrc = -1; GST_DEBUG_OBJECT (rtp_mux, "collided ssrc: %x", ssrc); /* choose another ssrc for our stream */ GST_OBJECT_LOCK (rtp_mux); if (ssrc == rtp_mux->current_ssrc) { GstCaps *caps; guint suggested_ssrc = 0; guint32 new_ssrc; if (gst_structure_get_uint (s, "suggested-ssrc", &suggested_ssrc)) rtp_mux->current_ssrc = suggested_ssrc; while (ssrc == rtp_mux->current_ssrc) rtp_mux->current_ssrc = g_random_int (); new_ssrc = rtp_mux->current_ssrc; GST_INFO_OBJECT (rtp_mux, "New ssrc after collision %x (was: %x)", new_ssrc, ssrc); GST_OBJECT_UNLOCK (rtp_mux); caps = gst_pad_get_current_caps (rtp_mux->srcpad); caps = gst_caps_make_writable (caps); gst_caps_set_simple (caps, "ssrc", G_TYPE_UINT, new_ssrc, NULL); gst_pad_set_caps (rtp_mux->srcpad, caps); gst_caps_unref (caps); } else { GST_OBJECT_UNLOCK (rtp_mux); } } break; } default: break; } return gst_pad_event_default (rtp_mux->srcpad, GST_OBJECT (rtp_mux), event); } static void gst_rtp_mux_init (GstRTPMux * rtp_mux) { GstElementClass *klass = GST_ELEMENT_GET_CLASS (rtp_mux); rtp_mux->srcpad = gst_pad_new_from_template (gst_element_class_get_pad_template (klass, "src"), "src"); gst_pad_set_event_function (rtp_mux->srcpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_src_event)); gst_pad_use_fixed_caps (rtp_mux->srcpad); gst_element_add_pad (GST_ELEMENT (rtp_mux), rtp_mux->srcpad); rtp_mux->ssrc = DEFAULT_SSRC; rtp_mux->current_ssrc = DEFAULT_SSRC; rtp_mux->ts_offset = DEFAULT_TIMESTAMP_OFFSET; rtp_mux->seqnum_offset = DEFAULT_SEQNUM_OFFSET; rtp_mux->last_stop = GST_CLOCK_TIME_NONE; } static void gst_rtp_mux_setup_sinkpad (GstRTPMux * rtp_mux, GstPad * sinkpad) { GstRTPMuxPadPrivate *padpriv = g_new0 (GstRTPMuxPadPrivate, 1); /* setup some pad functions */ 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_pad_set_query_function (sinkpad, GST_DEBUG_FUNCPTR (gst_rtp_mux_sink_query)); 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, const GstCaps * caps) { 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) { g_free (padpriv); } } /* Put our own timestamp-offset on the buffer */ static void gst_rtp_mux_readjust_rtp_timestamp_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv, GstRTPBuffer * rtpbuffer) { guint32 ts; guint32 sink_ts_base = 0; if (padpriv && padpriv->have_timestamp_offset) sink_ts_base = padpriv->timestamp_offset; ts = gst_rtp_buffer_get_timestamp (rtpbuffer) - sink_ts_base + rtp_mux->ts_base; GST_LOG_OBJECT (rtp_mux, "Re-adjusting RTP ts %u to %u", gst_rtp_buffer_get_timestamp (rtpbuffer), ts); gst_rtp_buffer_set_timestamp (rtpbuffer, ts); } static gboolean process_buffer_locked (GstRTPMux * rtp_mux, GstRTPMuxPadPrivate * padpriv, GstRTPBuffer * rtpbuffer) { GstRTPMuxClass *klass = GST_RTP_MUX_GET_CLASS (rtp_mux); if (klass->accept_buffer_locked) if (!klass->accept_buffer_locked (rtp_mux, padpriv, rtpbuffer)) return FALSE; rtp_mux->seqnum++; gst_rtp_buffer_set_seq (rtpbuffer, rtp_mux->seqnum); gst_rtp_buffer_set_ssrc (rtpbuffer, rtp_mux->current_ssrc); gst_rtp_mux_readjust_rtp_timestamp_locked (rtp_mux, padpriv, rtpbuffer); GST_LOG_OBJECT (rtp_mux, "Pushing packet size %" G_GSIZE_FORMAT ", seq=%d, ts=%u, ssrc=%x", rtpbuffer->map[0].size, rtp_mux->seqnum, gst_rtp_buffer_get_timestamp (rtpbuffer), rtp_mux->current_ssrc); if (padpriv) { if (padpriv->segment.format == GST_FORMAT_TIME) { GST_BUFFER_PTS (rtpbuffer->buffer) = gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME, GST_BUFFER_PTS (rtpbuffer->buffer)); GST_BUFFER_DTS (rtpbuffer->buffer) = gst_segment_to_running_time (&padpriv->segment, GST_FORMAT_TIME, GST_BUFFER_DTS (rtpbuffer->buffer)); } } return TRUE; } struct BufferListData { GstRTPMux *rtp_mux; GstRTPMuxPadPrivate *padpriv; gboolean drop; }; static gboolean process_list_item (GstBuffer ** buffer, guint idx, gpointer user_data) { struct BufferListData *bd = user_data; GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT; *buffer = gst_buffer_make_writable (*buffer); gst_rtp_buffer_map (*buffer, GST_MAP_READWRITE, &rtpbuffer); bd->drop = !process_buffer_locked (bd->rtp_mux, bd->padpriv, &rtpbuffer); gst_rtp_buffer_unmap (&rtpbuffer); if (bd->drop) return FALSE; if (GST_BUFFER_DURATION_IS_VALID (*buffer) && GST_BUFFER_PTS_IS_VALID (*buffer)) bd->rtp_mux->last_stop = GST_BUFFER_PTS (*buffer) + GST_BUFFER_DURATION (*buffer); else bd->rtp_mux->last_stop = GST_CLOCK_TIME_NONE; return TRUE; } static gboolean resend_events (GstPad * pad, GstEvent ** event, gpointer user_data); static GstFlowReturn gst_rtp_mux_chain_list (GstPad * pad, GstObject * parent, GstBufferList * bufferlist) { GstRTPMux *rtp_mux; GstFlowReturn ret; GstRTPMuxPadPrivate *padpriv; gboolean changed = FALSE; struct BufferListData bd; rtp_mux = GST_RTP_MUX (parent); if (gst_pad_check_reconfigure (rtp_mux->srcpad)) { GstCaps *current_caps = gst_pad_get_current_caps (pad); if (!gst_rtp_mux_setcaps (pad, rtp_mux, current_caps)) { gst_pad_mark_reconfigure (rtp_mux->srcpad); if (GST_PAD_IS_FLUSHING (rtp_mux->srcpad)) ret = GST_FLOW_FLUSHING; else ret = GST_FLOW_NOT_NEGOTIATED; gst_buffer_list_unref (bufferlist); goto out; } gst_caps_unref (current_caps); } 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; } bd.rtp_mux = rtp_mux; bd.padpriv = padpriv; bd.drop = FALSE; bufferlist = gst_buffer_list_make_writable (bufferlist); gst_buffer_list_foreach (bufferlist, process_list_item, &bd); if (!bd.drop && pad != rtp_mux->last_pad) { changed = TRUE; g_clear_object (&rtp_mux->last_pad); rtp_mux->last_pad = g_object_ref (pad); } GST_OBJECT_UNLOCK (rtp_mux); if (changed) gst_pad_sticky_events_foreach (pad, resend_events, rtp_mux); if (bd.drop) { gst_buffer_list_unref (bufferlist); ret = GST_FLOW_OK; } else { ret = gst_pad_push_list (rtp_mux->srcpad, bufferlist); } out: return ret; } static gboolean resend_events (GstPad * pad, GstEvent ** event, gpointer user_data) { GstRTPMux *rtp_mux = user_data; if (GST_EVENT_TYPE (*event) == GST_EVENT_CAPS) { GstCaps *caps; gst_event_parse_caps (*event, &caps); gst_rtp_mux_setcaps (pad, rtp_mux, caps); } else if (GST_EVENT_TYPE (*event) == GST_EVENT_SEGMENT) { GstSegment new_segment; gst_segment_init (&new_segment, GST_FORMAT_TIME); gst_pad_push_event (rtp_mux->srcpad, gst_event_new_segment (&new_segment)); } else { gst_pad_push_event (rtp_mux->srcpad, gst_event_ref (*event)); } return TRUE; } static GstFlowReturn gst_rtp_mux_chain (GstPad * pad, GstObject * parent, GstBuffer * buffer) { GstRTPMux *rtp_mux; GstFlowReturn ret; GstRTPMuxPadPrivate *padpriv; gboolean drop; gboolean changed = FALSE; GstRTPBuffer rtpbuffer = GST_RTP_BUFFER_INIT; rtp_mux = GST_RTP_MUX (parent); if (gst_pad_check_reconfigure (rtp_mux->srcpad)) { GstCaps *current_caps = gst_pad_get_current_caps (pad); if (!gst_rtp_mux_setcaps (pad, rtp_mux, current_caps)) { gst_pad_mark_reconfigure (rtp_mux->srcpad); if (GST_PAD_IS_FLUSHING (rtp_mux->srcpad)) ret = GST_FLOW_FLUSHING; else ret = GST_FLOW_NOT_NEGOTIATED; gst_buffer_unref (buffer); goto out; } gst_caps_unref (current_caps); } 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); if (!gst_rtp_buffer_map (buffer, GST_MAP_READWRITE, &rtpbuffer)) { GST_OBJECT_UNLOCK (rtp_mux); gst_buffer_unref (buffer); GST_ERROR_OBJECT (rtp_mux, "Invalid RTP buffer"); return GST_FLOW_ERROR; } drop = !process_buffer_locked (rtp_mux, padpriv, &rtpbuffer); gst_rtp_buffer_unmap (&rtpbuffer); if (!drop) { if (pad != rtp_mux->last_pad) { changed = TRUE; g_clear_object (&rtp_mux->last_pad); rtp_mux->last_pad = g_object_ref (pad); } if (GST_BUFFER_DURATION_IS_VALID (buffer) && GST_BUFFER_PTS_IS_VALID (buffer)) rtp_mux->last_stop = GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer); else rtp_mux->last_stop = GST_CLOCK_TIME_NONE; } GST_OBJECT_UNLOCK (rtp_mux); if (changed) gst_pad_sticky_events_foreach (pad, resend_events, rtp_mux); if (drop) { gst_buffer_unref (buffer); ret = GST_FLOW_OK; } else { ret = gst_pad_push (rtp_mux->srcpad, buffer); } out: return ret; } static gboolean gst_rtp_mux_setcaps (GstPad * pad, GstRTPMux * rtp_mux, GstCaps * caps) { GstStructure *structure; gboolean ret = FALSE; GstRTPMuxPadPrivate *padpriv; GstCaps *peercaps; if (caps == NULL) return FALSE; if (!gst_caps_is_fixed (caps)) return FALSE; peercaps = gst_pad_peer_query_caps (rtp_mux->srcpad, NULL); if (peercaps) { GstCaps *tcaps, *othercaps;; tcaps = gst_pad_get_pad_template_caps (pad); othercaps = gst_caps_intersect_full (peercaps, tcaps, GST_CAPS_INTERSECT_FIRST); if (gst_caps_get_size (othercaps) > 0) { structure = gst_caps_get_structure (othercaps, 0); GST_OBJECT_LOCK (rtp_mux); if (gst_structure_get_uint (structure, "ssrc", &rtp_mux->current_ssrc)) { GST_INFO_OBJECT (pad, "Use downstream ssrc: %x", rtp_mux->current_ssrc); rtp_mux->have_ssrc = TRUE; } if (gst_structure_get_uint (structure, "timestamp-offset", &rtp_mux->ts_base)) { GST_INFO_OBJECT (pad, "Use downstream timestamp-offset: %u", rtp_mux->ts_base); } GST_OBJECT_UNLOCK (rtp_mux); } gst_caps_unref (othercaps); gst_caps_unref (peercaps); gst_caps_unref (tcaps); } structure = gst_caps_get_structure (caps, 0); if (!structure) return FALSE; GST_OBJECT_LOCK (rtp_mux); padpriv = gst_pad_get_element_private (pad); if (padpriv && gst_structure_get_uint (structure, "timestamp-offset", &padpriv->timestamp_offset)) { padpriv->have_timestamp_offset = TRUE; } caps = gst_caps_copy (caps); /* if we don't have a specified ssrc, first try to take one from the caps, and if that fails, generate one */ if (rtp_mux->ssrc == DEFAULT_SSRC) { if (rtp_mux->current_ssrc == DEFAULT_SSRC) { if (!gst_structure_get_uint (structure, "ssrc", &rtp_mux->current_ssrc)) { rtp_mux->current_ssrc = g_random_int (); GST_INFO_OBJECT (rtp_mux, "Set random ssrc %x", rtp_mux->current_ssrc); } } } else { rtp_mux->current_ssrc = rtp_mux->ssrc; GST_INFO_OBJECT (rtp_mux, "Set ssrc %x", rtp_mux->current_ssrc); } gst_caps_set_simple (caps, "timestamp-offset", G_TYPE_UINT, rtp_mux->ts_base, "seqnum-offset", G_TYPE_UINT, rtp_mux->seqnum_base, "ssrc", G_TYPE_UINT, rtp_mux->current_ssrc, NULL); GST_OBJECT_UNLOCK (rtp_mux); if (rtp_mux->send_stream_start) { gchar s_id[32]; /* stream-start (FIXME: create id based on input ids) */ g_snprintf (s_id, sizeof (s_id), "interleave-%08x", g_random_int ()); gst_pad_push_event (rtp_mux->srcpad, gst_event_new_stream_start (s_id)); rtp_mux->send_stream_start = FALSE; } GST_DEBUG_OBJECT (rtp_mux, "setting caps %" GST_PTR_FORMAT " on src pad..", caps); ret = gst_pad_set_caps (rtp_mux->srcpad, caps); gst_caps_unref (caps); 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 (const GValue * item, GValue * ret, gpointer user_data) { GstPad *mypad = user_data; GstPad *pad = g_value_get_object (item); GstCaps *peercaps; GstCaps *accumcaps; if (pad == mypad) return TRUE; accumcaps = g_value_get_boxed (ret); peercaps = gst_pad_peer_query_caps (pad, accumcaps); if (!peercaps) { g_warning ("no peercaps"); return TRUE; } peercaps = gst_caps_make_writable (peercaps); clear_caps (peercaps, TRUE); g_value_take_boxed (ret, peercaps); return !gst_caps_is_empty (peercaps); } static GstCaps * gst_rtp_mux_getcaps (GstPad * pad, GstRTPMux * mux, GstCaps * filter) { GstCaps *caps = NULL; GstIterator *iter = NULL; GValue v = { 0 }; GstIteratorResult res; GstCaps *peercaps; GstCaps *othercaps; GstCaps *tcaps; const GstStructure *structure; peercaps = gst_pad_peer_query_caps (mux->srcpad, NULL); if (peercaps) { tcaps = gst_pad_get_pad_template_caps (pad); othercaps = gst_caps_intersect_full (peercaps, tcaps, GST_CAPS_INTERSECT_FIRST); gst_caps_unref (peercaps); } else { tcaps = gst_pad_get_pad_template_caps (mux->srcpad); if (filter) othercaps = gst_caps_intersect_full (filter, tcaps, GST_CAPS_INTERSECT_FIRST); else othercaps = gst_caps_copy (tcaps); } gst_caps_unref (tcaps); GST_LOG_OBJECT (pad, "Intersected srcpad-peercaps and template caps: %" GST_PTR_FORMAT, othercaps); structure = gst_caps_get_structure (othercaps, 0); if (mux->ssrc == DEFAULT_SSRC) { if (gst_structure_get_uint (structure, "ssrc", &mux->current_ssrc)) GST_DEBUG_OBJECT (pad, "Use downstream ssrc: %x", mux->current_ssrc); } clear_caps (othercaps, TRUE); 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); gst_iterator_resync (iter); } while (res == GST_ITERATOR_RESYNC); gst_iterator_free (iter); caps = gst_caps_intersect ((GstCaps *) gst_value_get_caps (&v), othercaps); g_value_unset (&v); gst_caps_unref (othercaps); if (res == GST_ITERATOR_ERROR) { gst_caps_unref (caps); caps = gst_caps_new_empty (); } return caps; } static gboolean gst_rtp_mux_sink_query (GstPad * pad, GstObject * parent, GstQuery * query) { GstRTPMux *mux = GST_RTP_MUX (parent); gboolean res = FALSE; switch (GST_QUERY_TYPE (query)) { case GST_QUERY_CAPS: { GstCaps *filter, *caps; gst_query_parse_caps (query, &filter); GST_LOG_OBJECT (pad, "Received caps-query with filter-caps: %" GST_PTR_FORMAT, filter); caps = gst_rtp_mux_getcaps (pad, mux, filter); gst_query_set_caps_result (query, caps); GST_LOG_OBJECT (mux, "Answering caps-query with caps: %" GST_PTR_FORMAT, caps); gst_caps_unref (caps); res = TRUE; break; } default: res = gst_pad_query_default (pad, parent, query); break; } return res; } 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); GST_OBJECT_LOCK (rtp_mux); 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: g_value_set_uint (value, rtp_mux->seqnum); 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; } GST_OBJECT_UNLOCK (rtp_mux); } 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: GST_OBJECT_LOCK (rtp_mux); rtp_mux->ssrc = g_value_get_uint (value); rtp_mux->current_ssrc = rtp_mux->ssrc; rtp_mux->have_ssrc = TRUE; GST_DEBUG_OBJECT (rtp_mux, "ssrc prop set to %x", rtp_mux->ssrc); GST_OBJECT_UNLOCK (rtp_mux); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static gboolean gst_rtp_mux_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstRTPMux *mux = GST_RTP_MUX (parent); gboolean is_pad; gboolean ret; GST_OBJECT_LOCK (mux); is_pad = (pad == mux->last_pad); GST_OBJECT_UNLOCK (mux); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CAPS: { GstCaps *caps; gst_event_parse_caps (event, &caps); GST_LOG_OBJECT (pad, "Received caps-event with caps: %" GST_PTR_FORMAT, caps); ret = gst_rtp_mux_setcaps (pad, mux, caps); gst_event_unref (event); return ret; } case GST_EVENT_FLUSH_STOP: { GST_OBJECT_LOCK (mux); mux->last_stop = GST_CLOCK_TIME_NONE; GST_OBJECT_UNLOCK (mux); break; } case GST_EVENT_SEGMENT: { GstRTPMuxPadPrivate *padpriv; GST_OBJECT_LOCK (mux); padpriv = gst_pad_get_element_private (pad); if (padpriv) { gst_event_copy_segment (event, &padpriv->segment); } GST_OBJECT_UNLOCK (mux); if (is_pad) { GstSegment new_segment; gst_segment_init (&new_segment, GST_FORMAT_TIME); gst_event_unref (event); event = gst_event_new_segment (&new_segment); } break; } default: break; } if (is_pad) { return gst_pad_push_event (mux->srcpad, event); } else { gst_event_unref (event); return TRUE; } } static void gst_rtp_mux_ready_to_paused (GstRTPMux * rtp_mux) { GST_OBJECT_LOCK (rtp_mux); g_clear_object (&rtp_mux->last_pad); rtp_mux->send_stream_start = TRUE; 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; rtp_mux->last_stop = GST_CLOCK_TIME_NONE; if (rtp_mux->have_ssrc) rtp_mux->current_ssrc = rtp_mux->ssrc; GST_DEBUG_OBJECT (rtp_mux, "set timestamp-offset 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; GstStateChangeReturn ret; rtp_mux = GST_RTP_MUX (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: gst_rtp_mux_ready_to_paused (rtp_mux); break; default: break; } ret = GST_ELEMENT_CLASS (gst_rtp_mux_parent_class)->change_state (element, transition); switch (transition) { case GST_STATE_CHANGE_PAUSED_TO_READY: g_clear_object (&rtp_mux->last_pad); break; default: break; } return ret; }