/* GStreamer * Copyright (C) 2017 Matthew Waters * * 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. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include "gstwebrtcbin.h" #include "gstwebrtcstats.h" #include "transportstream.h" #include "transportreceivebin.h" #include "utils.h" #include "webrtcsdp.h" #include "webrtctransceiver.h" #include "webrtcdatachannel.h" #include "sctptransport.h" #include #include #include #define RANDOM_SESSION_ID \ ((((((guint64) g_random_int()) << 32) | \ (guint64) g_random_int ())) & \ G_GUINT64_CONSTANT (0x7fffffffffffffff)) #define PC_GET_LOCK(w) (&w->priv->pc_lock) #define PC_LOCK(w) (g_mutex_lock (PC_GET_LOCK(w))) #define PC_UNLOCK(w) (g_mutex_unlock (PC_GET_LOCK(w))) #define PC_GET_COND(w) (&w->priv->pc_cond) #define PC_COND_WAIT(w) (g_cond_wait(PC_GET_COND(w), PC_GET_LOCK(w))) #define PC_COND_BROADCAST(w) (g_cond_broadcast(PC_GET_COND(w))) #define PC_COND_SIGNAL(w) (g_cond_signal(PC_GET_COND(w))) #define ICE_GET_LOCK(w) (&w->priv->ice_lock) #define ICE_LOCK(w) (g_mutex_lock (ICE_GET_LOCK(w))) #define ICE_UNLOCK(w) (g_mutex_unlock (ICE_GET_LOCK(w))) /* * This webrtcbin implements the majority of the W3's peerconnection API and * implementation guide where possible. Generating offers, answers and setting * local and remote SDP's are all supported. Both media descriptions and * descriptions involving data channels are supported. * * Each input/output pad is equivalent to a Track in W3 parlance which are * added/removed from the bin. The number of requested sink pads is the number * of streams that will be sent to the receiver and will be associated with a * GstWebRTCRTPTransceiver (very similar to W3 RTPTransceiver's). * * On the receiving side, RTPTransceiver's are created in response to setting * a remote description. Output pads for the receiving streams in the set * description are also created when data is received. * * A TransportStream is created when needed in order to transport the data over * the necessary DTLS/ICE channel to the peer. The exact configuration depends * on the negotiated SDP's between the peers based on the bundle and rtcp * configuration. Some cases are outlined below for a simple single * audio/video/data session: * * - max-bundle (requires rtcp-muxing) uses a single transport for all * media/data transported. Renegotiation involves adding/removing the * necessary streams to the existing transports. * - max-compat without rtcp-mux involves two TransportStream per media stream * to transport the rtp and the rtcp packets and a single TransportStream for * all data channels. Each stream change involves modifying the associated * TransportStream/s as necessary. */ /* * TODO: * assert sending payload type matches the stream * reconfiguration (of anything) * LS groups * balanced bundle policy * setting custom DTLS certificates * * separate session id's from mlineindex properly * how to deal with replacing a input/output track/stream */ static void _update_need_negotiation (GstWebRTCBin * webrtc); #define GST_CAT_DEFAULT gst_webrtc_bin_debug GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT); enum { PROP_PAD_TRANSCEIVER = 1, }; static gboolean _have_nice_elements (GstWebRTCBin * webrtc) { GstPluginFeature *feature; feature = gst_registry_lookup_feature (gst_registry_get (), "nicesrc"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "libnice elements are not available")); return FALSE; } feature = gst_registry_lookup_feature (gst_registry_get (), "nicesink"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "libnice elements are not available")); return FALSE; } return TRUE; } static gboolean _have_sctp_elements (GstWebRTCBin * webrtc) { GstPluginFeature *feature; feature = gst_registry_lookup_feature (gst_registry_get (), "sctpdec"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "sctp elements are not available")); return FALSE; } feature = gst_registry_lookup_feature (gst_registry_get (), "sctpenc"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "sctp elements are not available")); return FALSE; } return TRUE; } static gboolean _have_dtls_elements (GstWebRTCBin * webrtc) { GstPluginFeature *feature; feature = gst_registry_lookup_feature (gst_registry_get (), "dtlsdec"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "dtls elements are not available")); return FALSE; } feature = gst_registry_lookup_feature (gst_registry_get (), "dtlsenc"); if (feature) { gst_object_unref (feature); } else { GST_ELEMENT_ERROR (webrtc, CORE, MISSING_PLUGIN, NULL, ("%s", "dtls elements are not available")); return FALSE; } return TRUE; } G_DEFINE_TYPE (GstWebRTCBinPad, gst_webrtc_bin_pad, GST_TYPE_GHOST_PAD); static void gst_webrtc_bin_pad_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { switch (prop_id) { default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_webrtc_bin_pad_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (object); switch (prop_id) { case PROP_PAD_TRANSCEIVER: g_value_set_object (value, pad->trans); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_webrtc_bin_pad_finalize (GObject * object) { GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (object); if (pad->trans) gst_object_unref (pad->trans); pad->trans = NULL; if (pad->received_caps) gst_caps_unref (pad->received_caps); pad->received_caps = NULL; G_OBJECT_CLASS (gst_webrtc_bin_pad_parent_class)->finalize (object); } static void gst_webrtc_bin_pad_class_init (GstWebRTCBinPadClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; gobject_class->get_property = gst_webrtc_bin_pad_get_property; gobject_class->set_property = gst_webrtc_bin_pad_set_property; gobject_class->finalize = gst_webrtc_bin_pad_finalize; g_object_class_install_property (gobject_class, PROP_PAD_TRANSCEIVER, g_param_spec_object ("transceiver", "Transceiver", "Transceiver associated with this pad", GST_TYPE_WEBRTC_RTP_TRANSCEIVER, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); } static gboolean gst_webrtcbin_sink_event (GstPad * pad, GstObject * parent, GstEvent * event) { GstWebRTCBinPad *wpad = GST_WEBRTC_BIN_PAD (pad); GstWebRTCBin *webrtc = GST_WEBRTC_BIN (parent); gboolean check_negotiation = FALSE; if (GST_EVENT_TYPE (event) == GST_EVENT_CAPS) { GstCaps *caps; gst_event_parse_caps (event, &caps); check_negotiation = (!wpad->received_caps || gst_caps_is_equal (wpad->received_caps, caps)); gst_caps_replace (&wpad->received_caps, caps); GST_DEBUG_OBJECT (parent, "On %" GST_PTR_FORMAT " checking negotiation? %u, caps %" GST_PTR_FORMAT, pad, check_negotiation, caps); } else if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) { check_negotiation = TRUE; } if (check_negotiation) { PC_LOCK (webrtc); _update_need_negotiation (webrtc); PC_UNLOCK (webrtc); } return gst_pad_event_default (pad, parent, event); } static void gst_webrtc_bin_pad_init (GstWebRTCBinPad * pad) { } static GstWebRTCBinPad * gst_webrtc_bin_pad_new (const gchar * name, GstPadDirection direction) { GstWebRTCBinPad *pad = g_object_new (gst_webrtc_bin_pad_get_type (), "name", name, "direction", direction, NULL); gst_pad_set_event_function (GST_PAD (pad), gst_webrtcbin_sink_event); if (!gst_ghost_pad_construct (GST_GHOST_PAD (pad))) { gst_object_unref (pad); return NULL; } GST_DEBUG_OBJECT (pad, "new visible pad with direction %s", direction == GST_PAD_SRC ? "src" : "sink"); return pad; } #define gst_webrtc_bin_parent_class parent_class G_DEFINE_TYPE_WITH_CODE (GstWebRTCBin, gst_webrtc_bin, GST_TYPE_BIN, G_ADD_PRIVATE (GstWebRTCBin) GST_DEBUG_CATEGORY_INIT (gst_webrtc_bin_debug, "webrtcbin", 0, "webrtcbin element"); ); static GstPad *_connect_input_stream (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad); static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink_%u", GST_PAD_SINK, GST_PAD_REQUEST, GST_STATIC_CAPS ("application/x-rtp")); static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src_%u", GST_PAD_SRC, GST_PAD_SOMETIMES, GST_STATIC_CAPS ("application/x-rtp")); enum { SIGNAL_0, CREATE_OFFER_SIGNAL, CREATE_ANSWER_SIGNAL, SET_LOCAL_DESCRIPTION_SIGNAL, SET_REMOTE_DESCRIPTION_SIGNAL, ADD_ICE_CANDIDATE_SIGNAL, ON_NEGOTIATION_NEEDED_SIGNAL, ON_ICE_CANDIDATE_SIGNAL, ON_NEW_TRANSCEIVER_SIGNAL, GET_STATS_SIGNAL, ADD_TRANSCEIVER_SIGNAL, GET_TRANSCEIVER_SIGNAL, GET_TRANSCEIVERS_SIGNAL, ADD_TURN_SERVER_SIGNAL, CREATE_DATA_CHANNEL_SIGNAL, ON_DATA_CHANNEL_SIGNAL, LAST_SIGNAL, }; enum { PROP_0, PROP_CONNECTION_STATE, PROP_SIGNALING_STATE, PROP_ICE_GATHERING_STATE, PROP_ICE_CONNECTION_STATE, PROP_LOCAL_DESCRIPTION, PROP_CURRENT_LOCAL_DESCRIPTION, PROP_PENDING_LOCAL_DESCRIPTION, PROP_REMOTE_DESCRIPTION, PROP_CURRENT_REMOTE_DESCRIPTION, PROP_PENDING_REMOTE_DESCRIPTION, PROP_STUN_SERVER, PROP_TURN_SERVER, PROP_BUNDLE_POLICY, PROP_ICE_TRANSPORT_POLICY, }; static guint gst_webrtc_bin_signals[LAST_SIGNAL] = { 0 }; typedef struct { guint session_id; GstWebRTCICEStream *stream; } IceStreamItem; /* FIXME: locking? */ GstWebRTCICEStream * _find_ice_stream_for_session (GstWebRTCBin * webrtc, guint session_id) { int i; for (i = 0; i < webrtc->priv->ice_stream_map->len; i++) { IceStreamItem *item = &g_array_index (webrtc->priv->ice_stream_map, IceStreamItem, i); if (item->session_id == session_id) { GST_TRACE_OBJECT (webrtc, "Found ice stream id %" GST_PTR_FORMAT " for " "session %u", item->stream, session_id); return item->stream; } } GST_TRACE_OBJECT (webrtc, "No ice stream available for session %u", session_id); return NULL; } void _add_ice_stream_item (GstWebRTCBin * webrtc, guint session_id, GstWebRTCICEStream * stream) { IceStreamItem item = { session_id, stream }; GST_TRACE_OBJECT (webrtc, "adding ice stream %" GST_PTR_FORMAT " for " "session %u", stream, session_id); g_array_append_val (webrtc->priv->ice_stream_map, item); } typedef struct { guint session_id; gchar *mid; } SessionMidItem; static void clear_session_mid_item (SessionMidItem * item) { g_free (item->mid); } typedef gboolean (*FindTransceiverFunc) (GstWebRTCRTPTransceiver * p1, gconstpointer data); static GstWebRTCRTPTransceiver * _find_transceiver (GstWebRTCBin * webrtc, gconstpointer data, FindTransceiverFunc func) { int i; for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *transceiver = g_ptr_array_index (webrtc->priv->transceivers, i); if (func (transceiver, data)) return transceiver; } return NULL; } static gboolean match_for_mid (GstWebRTCRTPTransceiver * trans, const gchar * mid) { return g_strcmp0 (trans->mid, mid) == 0; } static gboolean transceiver_match_for_mline (GstWebRTCRTPTransceiver * trans, guint * mline) { return trans->mline == *mline; } static GstWebRTCRTPTransceiver * _find_transceiver_for_mline (GstWebRTCBin * webrtc, guint mlineindex) { GstWebRTCRTPTransceiver *trans; trans = _find_transceiver (webrtc, &mlineindex, (FindTransceiverFunc) transceiver_match_for_mline); GST_TRACE_OBJECT (webrtc, "Found transceiver %" GST_PTR_FORMAT " for mlineindex %u", trans, mlineindex); return trans; } typedef gboolean (*FindTransportFunc) (TransportStream * p1, gconstpointer data); static TransportStream * _find_transport (GstWebRTCBin * webrtc, gconstpointer data, FindTransportFunc func) { int i; for (i = 0; i < webrtc->priv->transports->len; i++) { TransportStream *stream = g_ptr_array_index (webrtc->priv->transports, i); if (func (stream, data)) return stream; } return NULL; } static gboolean match_stream_for_session (TransportStream * trans, guint * session) { return trans->session_id == *session; } static TransportStream * _find_transport_for_session (GstWebRTCBin * webrtc, guint session_id) { TransportStream *stream; stream = _find_transport (webrtc, &session_id, (FindTransportFunc) match_stream_for_session); GST_TRACE_OBJECT (webrtc, "Found transport %" GST_PTR_FORMAT " for session %u", stream, session_id); return stream; } typedef gboolean (*FindPadFunc) (GstWebRTCBinPad * p1, gconstpointer data); static GstWebRTCBinPad * _find_pad (GstWebRTCBin * webrtc, gconstpointer data, FindPadFunc func) { GstElement *element = GST_ELEMENT (webrtc); GList *l; GST_OBJECT_LOCK (webrtc); l = element->pads; for (; l; l = g_list_next (l)) { if (!GST_IS_WEBRTC_BIN_PAD (l->data)) continue; if (func (l->data, data)) { gst_object_ref (l->data); GST_OBJECT_UNLOCK (webrtc); return l->data; } } l = webrtc->priv->pending_pads; for (; l; l = g_list_next (l)) { if (!GST_IS_WEBRTC_BIN_PAD (l->data)) continue; if (func (l->data, data)) { gst_object_ref (l->data); GST_OBJECT_UNLOCK (webrtc); return l->data; } } GST_OBJECT_UNLOCK (webrtc); return NULL; } typedef gboolean (*FindDataChannelFunc) (GstWebRTCDataChannel * p1, gconstpointer data); static GstWebRTCDataChannel * _find_data_channel (GstWebRTCBin * webrtc, gconstpointer data, FindDataChannelFunc func) { int i; for (i = 0; i < webrtc->priv->data_channels->len; i++) { GstWebRTCDataChannel *channel = g_ptr_array_index (webrtc->priv->data_channels, i); if (func (channel, data)) return channel; } return NULL; } static gboolean data_channel_match_for_id (GstWebRTCDataChannel * channel, gint * id) { return channel->id == *id; } static GstWebRTCDataChannel * _find_data_channel_for_id (GstWebRTCBin * webrtc, gint id) { GstWebRTCDataChannel *channel; channel = _find_data_channel (webrtc, &id, (FindDataChannelFunc) data_channel_match_for_id); GST_TRACE_OBJECT (webrtc, "Found data channel %" GST_PTR_FORMAT " for id %i", channel, id); return channel; } static void _add_pad_to_list (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad) { GST_OBJECT_LOCK (webrtc); webrtc->priv->pending_pads = g_list_prepend (webrtc->priv->pending_pads, pad); GST_OBJECT_UNLOCK (webrtc); } static void _remove_pending_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad) { GST_OBJECT_LOCK (webrtc); webrtc->priv->pending_pads = g_list_remove (webrtc->priv->pending_pads, pad); GST_OBJECT_UNLOCK (webrtc); } static void _add_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad) { _remove_pending_pad (webrtc, pad); if (webrtc->priv->running) gst_pad_set_active (GST_PAD (pad), TRUE); gst_element_add_pad (GST_ELEMENT (webrtc), GST_PAD (pad)); } static void _remove_pad (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad) { _remove_pending_pad (webrtc, pad); gst_element_remove_pad (GST_ELEMENT (webrtc), GST_PAD (pad)); } typedef struct { GstPadDirection direction; guint mlineindex; } MLineMatch; static gboolean pad_match_for_mline (GstWebRTCBinPad * pad, const MLineMatch * match) { return GST_PAD_DIRECTION (pad) == match->direction && pad->mlineindex == match->mlineindex; } static GstWebRTCBinPad * _find_pad_for_mline (GstWebRTCBin * webrtc, GstPadDirection direction, guint mlineindex) { MLineMatch m = { direction, mlineindex }; return _find_pad (webrtc, &m, (FindPadFunc) pad_match_for_mline); } typedef struct { GstPadDirection direction; GstWebRTCRTPTransceiver *trans; } TransMatch; static gboolean pad_match_for_transceiver (GstWebRTCBinPad * pad, TransMatch * m) { return GST_PAD_DIRECTION (pad) == m->direction && pad->trans == m->trans; } static GstWebRTCBinPad * _find_pad_for_transceiver (GstWebRTCBin * webrtc, GstPadDirection direction, GstWebRTCRTPTransceiver * trans) { TransMatch m = { direction, trans }; return _find_pad (webrtc, &m, (FindPadFunc) pad_match_for_transceiver); } #if 0 static gboolean match_for_ssrc (GstWebRTCBinPad * pad, guint * ssrc) { return pad->ssrc == *ssrc; } static gboolean match_for_pad (GstWebRTCBinPad * pad, GstWebRTCBinPad * other) { return pad == other; } #endif static gboolean _unlock_pc_thread (GMutex * lock) { g_mutex_unlock (lock); return G_SOURCE_REMOVE; } static gpointer _gst_pc_thread (GstWebRTCBin * webrtc) { PC_LOCK (webrtc); webrtc->priv->main_context = g_main_context_new (); webrtc->priv->loop = g_main_loop_new (webrtc->priv->main_context, FALSE); PC_COND_BROADCAST (webrtc); g_main_context_invoke (webrtc->priv->main_context, (GSourceFunc) _unlock_pc_thread, PC_GET_LOCK (webrtc)); /* Having the thread be the thread default GMainContext will break the * required queue-like ordering (from W3's peerconnection spec) of re-entrant * tasks */ g_main_loop_run (webrtc->priv->loop); PC_LOCK (webrtc); g_main_context_unref (webrtc->priv->main_context); webrtc->priv->main_context = NULL; g_main_loop_unref (webrtc->priv->loop); webrtc->priv->loop = NULL; PC_COND_BROADCAST (webrtc); PC_UNLOCK (webrtc); return NULL; } static void _start_thread (GstWebRTCBin * webrtc) { PC_LOCK (webrtc); webrtc->priv->thread = g_thread_new ("gst-pc-ops", (GThreadFunc) _gst_pc_thread, webrtc); while (!webrtc->priv->loop) PC_COND_WAIT (webrtc); webrtc->priv->is_closed = FALSE; PC_UNLOCK (webrtc); } static void _stop_thread (GstWebRTCBin * webrtc) { PC_LOCK (webrtc); webrtc->priv->is_closed = TRUE; g_main_loop_quit (webrtc->priv->loop); while (webrtc->priv->loop) PC_COND_WAIT (webrtc); PC_UNLOCK (webrtc); g_thread_unref (webrtc->priv->thread); } static gboolean _execute_op (GstWebRTCBinTask * op) { PC_LOCK (op->webrtc); if (op->webrtc->priv->is_closed) { GST_DEBUG_OBJECT (op->webrtc, "Peerconnection is closed, aborting execution"); goto out; } op->op (op->webrtc, op->data); out: PC_UNLOCK (op->webrtc); return G_SOURCE_REMOVE; } static void _free_op (GstWebRTCBinTask * op) { if (op->notify) op->notify (op->data); g_free (op); } void gst_webrtc_bin_enqueue_task (GstWebRTCBin * webrtc, GstWebRTCBinFunc func, gpointer data, GDestroyNotify notify) { GstWebRTCBinTask *op; GSource *source; g_return_if_fail (GST_IS_WEBRTC_BIN (webrtc)); if (webrtc->priv->is_closed) { GST_DEBUG_OBJECT (webrtc, "Peerconnection is closed, aborting execution"); if (notify) notify (data); return; } op = g_new0 (GstWebRTCBinTask, 1); op->webrtc = webrtc; op->op = func; op->data = data; op->notify = notify; source = g_idle_source_new (); g_source_set_priority (source, G_PRIORITY_DEFAULT); g_source_set_callback (source, (GSourceFunc) _execute_op, op, (GDestroyNotify) _free_op); g_source_attach (source, webrtc->priv->main_context); g_source_unref (source); } /* https://www.w3.org/TR/webrtc/#dom-rtciceconnectionstate */ static GstWebRTCICEConnectionState _collate_ice_connection_states (GstWebRTCBin * webrtc) { #define STATE(val) GST_WEBRTC_ICE_CONNECTION_STATE_ ## val GstWebRTCICEConnectionState any_state = 0; gboolean all_new_or_closed = TRUE; gboolean all_completed_or_closed = TRUE; gboolean all_connected_completed_or_closed = TRUE; int i; for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *rtp_trans = g_ptr_array_index (webrtc->priv->transceivers, i); WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans); TransportStream *stream = trans->stream; GstWebRTCICETransport *transport, *rtcp_transport; GstWebRTCICEConnectionState ice_state; gboolean rtcp_mux = FALSE; if (rtp_trans->stopped) { GST_TRACE_OBJECT (webrtc, "transceiver %p stopped", rtp_trans); continue; } if (!rtp_trans->mid) { GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans); continue; } g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL); transport = webrtc_transceiver_get_dtls_transport (rtp_trans)->transport; /* get transport state */ g_object_get (transport, "state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p state 0x%x", rtp_trans, ice_state); any_state |= (1 << ice_state); if (ice_state != STATE (NEW) && ice_state != STATE (CLOSED)) all_new_or_closed = FALSE; if (ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED)) all_completed_or_closed = FALSE; if (ice_state != STATE (CONNECTED) && ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED)) all_connected_completed_or_closed = FALSE; rtcp_transport = webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans)->transport; if (!rtcp_mux && rtcp_transport && transport != rtcp_transport) { g_object_get (rtcp_transport, "state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP state 0x%x", rtp_trans, ice_state); any_state |= (1 << ice_state); if (ice_state != STATE (NEW) && ice_state != STATE (CLOSED)) all_new_or_closed = FALSE; if (ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED)) all_completed_or_closed = FALSE; if (ice_state != STATE (CONNECTED) && ice_state != STATE (COMPLETED) && ice_state != STATE (CLOSED)) all_connected_completed_or_closed = FALSE; } } GST_TRACE_OBJECT (webrtc, "ICE connection state: 0x%x", any_state); if (webrtc->priv->is_closed) { GST_TRACE_OBJECT (webrtc, "returning closed"); return STATE (CLOSED); } /* Any of the RTCIceTransports are in the failed state. */ if (any_state & (1 << STATE (FAILED))) { GST_TRACE_OBJECT (webrtc, "returning failed"); return STATE (FAILED); } /* Any of the RTCIceTransports are in the disconnected state. */ if (any_state & (1 << STATE (DISCONNECTED))) { GST_TRACE_OBJECT (webrtc, "returning disconnected"); return STATE (DISCONNECTED); } /* All of the RTCIceTransports are in the new or closed state, or there are * no transports. */ if (all_new_or_closed || webrtc->priv->transceivers->len == 0) { GST_TRACE_OBJECT (webrtc, "returning new"); return STATE (NEW); } /* Any of the RTCIceTransports are in the checking or new state. */ if ((any_state & (1 << STATE (CHECKING))) || (any_state & (1 << STATE (NEW)))) { GST_TRACE_OBJECT (webrtc, "returning checking"); return STATE (CHECKING); } /* All RTCIceTransports are in the completed or closed state. */ if (all_completed_or_closed) { GST_TRACE_OBJECT (webrtc, "returning completed"); return STATE (COMPLETED); } /* All RTCIceTransports are in the connected, completed or closed state. */ if (all_connected_completed_or_closed) { GST_TRACE_OBJECT (webrtc, "returning connected"); return STATE (CONNECTED); } GST_FIXME ("unspecified situation, returning old state"); return webrtc->ice_connection_state; #undef STATE } /* https://www.w3.org/TR/webrtc/#dom-rtcicegatheringstate */ static GstWebRTCICEGatheringState _collate_ice_gathering_states (GstWebRTCBin * webrtc) { #define STATE(val) GST_WEBRTC_ICE_GATHERING_STATE_ ## val GstWebRTCICEGatheringState any_state = 0; gboolean all_completed = webrtc->priv->transceivers->len > 0; int i; for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *rtp_trans = g_ptr_array_index (webrtc->priv->transceivers, i); WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans); TransportStream *stream = trans->stream; GstWebRTCDTLSTransport *dtls_transport; GstWebRTCICETransport *transport, *rtcp_transport; GstWebRTCICEGatheringState ice_state; gboolean rtcp_mux = FALSE; if (rtp_trans->stopped || stream == NULL) { GST_TRACE_OBJECT (webrtc, "transceiver %p stopped or unassociated", rtp_trans); continue; } /* We only have a mid in the transceiver after we got the SDP answer, * which is usually long after gathering has finished */ if (!rtp_trans->mid) { GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans); } g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL); dtls_transport = webrtc_transceiver_get_dtls_transport (rtp_trans); if (dtls_transport == NULL) { GST_WARNING ("Transceiver %p has no DTLS transport", rtp_trans); continue; } transport = dtls_transport->transport; /* get gathering state */ g_object_get (transport, "gathering-state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p gathering state: 0x%x", rtp_trans, ice_state); any_state |= (1 << ice_state); if (ice_state != STATE (COMPLETE)) all_completed = FALSE; dtls_transport = webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans); if (dtls_transport == NULL) { GST_WARNING ("Transceiver %p has no DTLS RTCP transport", rtp_trans); continue; } rtcp_transport = dtls_transport->transport; if (!rtcp_mux && rtcp_transport && rtcp_transport != transport) { g_object_get (rtcp_transport, "gathering-state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP gathering state: 0x%x", rtp_trans, ice_state); any_state |= (1 << ice_state); if (ice_state != STATE (COMPLETE)) all_completed = FALSE; } } GST_TRACE_OBJECT (webrtc, "ICE gathering state: 0x%x", any_state); /* Any of the RTCIceTransport s are in the gathering state. */ if (any_state & (1 << STATE (GATHERING))) { GST_TRACE_OBJECT (webrtc, "returning gathering"); return STATE (GATHERING); } /* At least one RTCIceTransport exists, and all RTCIceTransport s are in * the completed gathering state. */ if (all_completed) { GST_TRACE_OBJECT (webrtc, "returning complete"); return STATE (COMPLETE); } /* Any of the RTCIceTransport s are in the new gathering state and none * of the transports are in the gathering state, or there are no transports. */ GST_TRACE_OBJECT (webrtc, "returning new"); return STATE (NEW); #undef STATE } /* https://www.w3.org/TR/webrtc/#rtcpeerconnectionstate-enum */ static GstWebRTCPeerConnectionState _collate_peer_connection_states (GstWebRTCBin * webrtc) { #define STATE(v) GST_WEBRTC_PEER_CONNECTION_STATE_ ## v #define ICE_STATE(v) GST_WEBRTC_ICE_CONNECTION_STATE_ ## v #define DTLS_STATE(v) GST_WEBRTC_DTLS_TRANSPORT_STATE_ ## v GstWebRTCICEConnectionState any_ice_state = 0; GstWebRTCDTLSTransportState any_dtls_state = 0; gboolean ice_all_new_or_closed = TRUE; gboolean dtls_all_new_or_closed = TRUE; gboolean ice_all_new_connecting_or_checking = TRUE; gboolean dtls_all_new_connecting_or_checking = TRUE; gboolean ice_all_connected_completed_or_closed = TRUE; gboolean dtls_all_connected_completed_or_closed = TRUE; int i; for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *rtp_trans = g_ptr_array_index (webrtc->priv->transceivers, i); WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans); TransportStream *stream = trans->stream; GstWebRTCDTLSTransport *transport, *rtcp_transport; GstWebRTCICEConnectionState ice_state; GstWebRTCDTLSTransportState dtls_state; gboolean rtcp_mux = FALSE; if (rtp_trans->stopped) { GST_TRACE_OBJECT (webrtc, "transceiver %p stopped", rtp_trans); continue; } if (!rtp_trans->mid) { GST_TRACE_OBJECT (webrtc, "transceiver %p has no mid", rtp_trans); continue; } g_object_get (stream, "rtcp-mux", &rtcp_mux, NULL); transport = webrtc_transceiver_get_dtls_transport (rtp_trans); /* get transport state */ g_object_get (transport, "state", &dtls_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p DTLS state: 0x%x", rtp_trans, dtls_state); any_dtls_state |= (1 << dtls_state); if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CLOSED)) dtls_all_new_or_closed = FALSE; if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CONNECTING)) dtls_all_new_connecting_or_checking = FALSE; if (dtls_state != DTLS_STATE (CONNECTED) && dtls_state != DTLS_STATE (CLOSED)) dtls_all_connected_completed_or_closed = FALSE; g_object_get (transport->transport, "state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p ICE state: 0x%x", rtp_trans, ice_state); any_ice_state |= (1 << ice_state); if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CLOSED)) ice_all_new_or_closed = FALSE; if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CHECKING)) ice_all_new_connecting_or_checking = FALSE; if (ice_state != ICE_STATE (CONNECTED) && ice_state != ICE_STATE (COMPLETED) && ice_state != ICE_STATE (CLOSED)) ice_all_connected_completed_or_closed = FALSE; rtcp_transport = webrtc_transceiver_get_rtcp_dtls_transport (rtp_trans); if (!rtcp_mux && rtcp_transport && rtcp_transport != transport) { g_object_get (rtcp_transport, "state", &dtls_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP DTLS state: 0x%x", rtp_trans, dtls_state); any_dtls_state |= (1 << dtls_state); if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CLOSED)) dtls_all_new_or_closed = FALSE; if (dtls_state != DTLS_STATE (NEW) && dtls_state != DTLS_STATE (CONNECTING)) dtls_all_new_connecting_or_checking = FALSE; if (dtls_state != DTLS_STATE (CONNECTED) && dtls_state != DTLS_STATE (CLOSED)) dtls_all_connected_completed_or_closed = FALSE; g_object_get (rtcp_transport->transport, "state", &ice_state, NULL); GST_TRACE_OBJECT (webrtc, "transceiver %p RTCP ICE state: 0x%x", rtp_trans, ice_state); any_ice_state |= (1 << ice_state); if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CLOSED)) ice_all_new_or_closed = FALSE; if (ice_state != ICE_STATE (NEW) && ice_state != ICE_STATE (CHECKING)) ice_all_new_connecting_or_checking = FALSE; if (ice_state != ICE_STATE (CONNECTED) && ice_state != ICE_STATE (COMPLETED) && ice_state != ICE_STATE (CLOSED)) ice_all_connected_completed_or_closed = FALSE; } } GST_TRACE_OBJECT (webrtc, "ICE connection state: 0x%x. DTLS connection " "state: 0x%x", any_ice_state, any_dtls_state); /* The RTCPeerConnection object's [[ isClosed]] slot is true. */ if (webrtc->priv->is_closed) { GST_TRACE_OBJECT (webrtc, "returning closed"); return STATE (CLOSED); } /* Any of the RTCIceTransport s or RTCDtlsTransport s are in a failed state. */ if (any_ice_state & (1 << ICE_STATE (FAILED))) { GST_TRACE_OBJECT (webrtc, "returning failed"); return STATE (FAILED); } if (any_dtls_state & (1 << DTLS_STATE (FAILED))) { GST_TRACE_OBJECT (webrtc, "returning failed"); return STATE (FAILED); } /* Any of the RTCIceTransport's or RTCDtlsTransport's are in the disconnected * state. */ if (any_ice_state & (1 << ICE_STATE (DISCONNECTED))) { GST_TRACE_OBJECT (webrtc, "returning disconnected"); return STATE (DISCONNECTED); } /* All RTCIceTransports and RTCDtlsTransports are in the new or closed * state, or there are no transports. */ if ((dtls_all_new_or_closed && ice_all_new_or_closed) || webrtc->priv->transceivers->len == 0) { GST_TRACE_OBJECT (webrtc, "returning new"); return STATE (NEW); } /* All RTCIceTransports and RTCDtlsTransports are in the new, connecting * or checking state. */ if (dtls_all_new_connecting_or_checking && ice_all_new_connecting_or_checking) { GST_TRACE_OBJECT (webrtc, "returning connecting"); return STATE (CONNECTING); } /* All RTCIceTransports and RTCDtlsTransports are in the connected, * completed or closed state. */ if (dtls_all_connected_completed_or_closed && ice_all_connected_completed_or_closed) { GST_TRACE_OBJECT (webrtc, "returning connected"); return STATE (CONNECTED); } /* FIXME: Unspecified state that happens for us */ if ((dtls_all_new_connecting_or_checking || dtls_all_connected_completed_or_closed) && (ice_all_new_connecting_or_checking || ice_all_connected_completed_or_closed)) { GST_TRACE_OBJECT (webrtc, "returning connecting"); return STATE (CONNECTING); } GST_FIXME_OBJECT (webrtc, "Undefined situation detected, returning old state"); return webrtc->peer_connection_state; #undef DTLS_STATE #undef ICE_STATE #undef STATE } static void _update_ice_gathering_state_task (GstWebRTCBin * webrtc, gpointer data) { GstWebRTCICEGatheringState old_state = webrtc->ice_gathering_state; GstWebRTCICEGatheringState new_state; new_state = _collate_ice_gathering_states (webrtc); /* If the new state is complete, before we update the public state, * check if anyone published more ICE candidates while we were collating * and stop if so, because it means there's a new later * ice_gathering_state_task queued */ if (new_state == GST_WEBRTC_ICE_GATHERING_STATE_COMPLETE) { ICE_LOCK (webrtc); if (webrtc->priv->pending_local_ice_candidates->len != 0) { /* ICE candidates queued for emissiong -> we're gathering, not complete */ new_state = GST_WEBRTC_ICE_GATHERING_STATE_GATHERING; } ICE_UNLOCK (webrtc); } if (new_state != webrtc->ice_gathering_state) { gchar *old_s, *new_s; old_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_GATHERING_STATE, old_state); new_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_GATHERING_STATE, new_state); GST_INFO_OBJECT (webrtc, "ICE gathering state change from %s(%u) to %s(%u)", old_s, old_state, new_s, new_state); g_free (old_s); g_free (new_s); webrtc->ice_gathering_state = new_state; PC_UNLOCK (webrtc); g_object_notify (G_OBJECT (webrtc), "ice-gathering-state"); PC_LOCK (webrtc); } } static void _update_ice_gathering_state (GstWebRTCBin * webrtc) { gst_webrtc_bin_enqueue_task (webrtc, _update_ice_gathering_state_task, NULL, NULL); } static void _update_ice_connection_state_task (GstWebRTCBin * webrtc, gpointer data) { GstWebRTCICEConnectionState old_state = webrtc->ice_connection_state; GstWebRTCICEConnectionState new_state; new_state = _collate_ice_connection_states (webrtc); if (new_state != old_state) { gchar *old_s, *new_s; old_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_CONNECTION_STATE, old_state); new_s = _enum_value_to_string (GST_TYPE_WEBRTC_ICE_CONNECTION_STATE, new_state); GST_INFO_OBJECT (webrtc, "ICE connection state change from %s(%u) to %s(%u)", old_s, old_state, new_s, new_state); g_free (old_s); g_free (new_s); webrtc->ice_connection_state = new_state; PC_UNLOCK (webrtc); g_object_notify (G_OBJECT (webrtc), "ice-connection-state"); PC_LOCK (webrtc); } } static void _update_ice_connection_state (GstWebRTCBin * webrtc) { gst_webrtc_bin_enqueue_task (webrtc, _update_ice_connection_state_task, NULL, NULL); } static void _update_peer_connection_state_task (GstWebRTCBin * webrtc, gpointer data) { GstWebRTCPeerConnectionState old_state = webrtc->peer_connection_state; GstWebRTCPeerConnectionState new_state; new_state = _collate_peer_connection_states (webrtc); if (new_state != old_state) { gchar *old_s, *new_s; old_s = _enum_value_to_string (GST_TYPE_WEBRTC_PEER_CONNECTION_STATE, old_state); new_s = _enum_value_to_string (GST_TYPE_WEBRTC_PEER_CONNECTION_STATE, new_state); GST_INFO_OBJECT (webrtc, "Peer connection state change from %s(%u) to %s(%u)", old_s, old_state, new_s, new_state); g_free (old_s); g_free (new_s); webrtc->peer_connection_state = new_state; PC_UNLOCK (webrtc); g_object_notify (G_OBJECT (webrtc), "connection-state"); PC_LOCK (webrtc); } } static void _update_peer_connection_state (GstWebRTCBin * webrtc) { gst_webrtc_bin_enqueue_task (webrtc, _update_peer_connection_state_task, NULL, NULL); } static gboolean _all_sinks_have_caps (GstWebRTCBin * webrtc) { GList *l; gboolean res = FALSE; GST_OBJECT_LOCK (webrtc); l = GST_ELEMENT (webrtc)->pads; for (; l; l = g_list_next (l)) { GstWebRTCBinPad *wpad; if (!GST_IS_WEBRTC_BIN_PAD (l->data)) continue; wpad = GST_WEBRTC_BIN_PAD (l->data); if (GST_PAD_DIRECTION (l->data) == GST_PAD_SINK && !wpad->received_caps && (!wpad->trans || !wpad->trans->stopped)) { goto done; } } l = webrtc->priv->pending_pads; for (; l; l = g_list_next (l)) { if (!GST_IS_WEBRTC_BIN_PAD (l->data)) { goto done; } } res = TRUE; done: GST_OBJECT_UNLOCK (webrtc); return res; } /* http://w3c.github.io/webrtc-pc/#dfn-check-if-negotiation-is-needed */ static gboolean _check_if_negotiation_is_needed (GstWebRTCBin * webrtc) { int i; GST_LOG_OBJECT (webrtc, "checking if negotiation is needed"); /* We can't negotiate until we have received caps on all our sink pads, * as we will need the ssrcs in our offer / answer */ if (!_all_sinks_have_caps (webrtc)) { GST_LOG_OBJECT (webrtc, "no negotiation possible until caps have been received on all sink pads"); return FALSE; } /* If any implementation-specific negotiation is required, as described at * the start of this section, return "true". * FIXME */ /* FIXME: emit when input caps/format changes? */ if (!webrtc->current_local_description) { GST_LOG_OBJECT (webrtc, "no local description set"); return TRUE; } if (!webrtc->current_remote_description) { GST_LOG_OBJECT (webrtc, "no remote description set"); return TRUE; } /* If connection has created any RTCDataChannel's, and no m= section has * been negotiated yet for data, return "true". */ if (webrtc->priv->data_channels->len > 0) { if (_message_get_datachannel_index (webrtc->current_local_description-> sdp) >= G_MAXUINT) { GST_LOG_OBJECT (webrtc, "no data channel media section and have %u " "transports", webrtc->priv->data_channels->len); return TRUE; } } for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *trans; trans = g_ptr_array_index (webrtc->priv->transceivers, i); if (trans->stopped) { /* FIXME: If t is stopped and is associated with an m= section according to * [JSEP] (section 3.4.1.), but the associated m= section is not yet * rejected in connection's currentLocalDescription or * currentRemoteDescription , return "true". */ GST_FIXME_OBJECT (webrtc, "check if the transceiver is rejected in descriptions"); } else { const GstSDPMedia *media; GstWebRTCRTPTransceiverDirection local_dir, remote_dir; if (trans->mline == -1 || trans->mid == NULL) { GST_LOG_OBJECT (webrtc, "unassociated transceiver %i %" GST_PTR_FORMAT " mid %s", i, trans, trans->mid); return TRUE; } /* internal inconsistency */ g_assert (trans->mline < gst_sdp_message_medias_len (webrtc->current_local_description->sdp)); g_assert (trans->mline < gst_sdp_message_medias_len (webrtc->current_remote_description->sdp)); /* FIXME: msid handling * If t's direction is "sendrecv" or "sendonly", and the associated m= * section in connection's currentLocalDescription doesn't contain an * "a=msid" line, return "true". */ media = gst_sdp_message_get_media (webrtc->current_local_description->sdp, trans->mline); local_dir = _get_direction_from_media (media); media = gst_sdp_message_get_media (webrtc->current_remote_description->sdp, trans->mline); remote_dir = _get_direction_from_media (media); if (webrtc->current_local_description->type == GST_WEBRTC_SDP_TYPE_OFFER) { /* If connection's currentLocalDescription if of type "offer", and * the direction of the associated m= section in neither the offer * nor answer matches t's direction, return "true". */ if (local_dir != trans->direction && remote_dir != trans->direction) { gchar *local_str, *remote_str, *dir_str; local_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, local_dir); remote_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, remote_dir); dir_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, trans->direction); GST_LOG_OBJECT (webrtc, "transceiver direction (%s) doesn't match " "description (local %s remote %s)", dir_str, local_str, remote_str); g_free (dir_str); g_free (local_str); g_free (remote_str); return TRUE; } } else if (webrtc->current_local_description->type == GST_WEBRTC_SDP_TYPE_ANSWER) { GstWebRTCRTPTransceiverDirection intersect_dir; /* If connection's currentLocalDescription if of type "answer", and * the direction of the associated m= section in the answer does not * match t's direction intersected with the offered direction (as * described in [JSEP] (section 5.3.1.)), return "true". */ /* remote is the offer, local is the answer */ intersect_dir = _intersect_answer_directions (remote_dir, local_dir); if (intersect_dir != trans->direction) { gchar *local_str, *remote_str, *inter_str, *dir_str; local_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, local_dir); remote_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, remote_dir); dir_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, trans->direction); inter_str = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, intersect_dir); GST_LOG_OBJECT (webrtc, "transceiver direction (%s) doesn't match " "description intersected direction %s (local %s remote %s)", dir_str, local_str, inter_str, remote_str); g_free (dir_str); g_free (local_str); g_free (remote_str); g_free (inter_str); return TRUE; } } } } GST_LOG_OBJECT (webrtc, "no negotiation needed"); return FALSE; } static void _check_need_negotiation_task (GstWebRTCBin * webrtc, gpointer unused) { if (webrtc->priv->need_negotiation) { GST_TRACE_OBJECT (webrtc, "emitting on-negotiation-needed"); PC_UNLOCK (webrtc); g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_NEGOTIATION_NEEDED_SIGNAL], 0); PC_LOCK (webrtc); } } /* http://w3c.github.io/webrtc-pc/#dfn-update-the-negotiation-needed-flag */ static void _update_need_negotiation (GstWebRTCBin * webrtc) { /* If connection's [[isClosed]] slot is true, abort these steps. */ if (webrtc->priv->is_closed) return; /* If connection's signaling state is not "stable", abort these steps. */ if (webrtc->signaling_state != GST_WEBRTC_SIGNALING_STATE_STABLE) return; /* If the result of checking if negotiation is needed is "false", clear the * negotiation-needed flag by setting connection's [[ needNegotiation]] slot * to false, and abort these steps. */ if (!_check_if_negotiation_is_needed (webrtc)) { webrtc->priv->need_negotiation = FALSE; return; } /* If connection's [[needNegotiation]] slot is already true, abort these steps. */ if (webrtc->priv->need_negotiation) return; /* Set connection's [[needNegotiation]] slot to true. */ webrtc->priv->need_negotiation = TRUE; /* Queue a task to check connection's [[ needNegotiation]] slot and, if still * true, fire a simple event named negotiationneeded at connection. */ gst_webrtc_bin_enqueue_task (webrtc, _check_need_negotiation_task, NULL, NULL); } static GstCaps * _find_codec_preferences (GstWebRTCBin * webrtc, GstWebRTCRTPTransceiver * rtp_trans, GstPadDirection direction, guint media_idx) { WebRTCTransceiver *trans = (WebRTCTransceiver *) rtp_trans; GstCaps *ret = NULL; GST_LOG_OBJECT (webrtc, "retrieving codec preferences from %" GST_PTR_FORMAT, trans); if (rtp_trans && rtp_trans->codec_preferences) { GST_LOG_OBJECT (webrtc, "Using codec preferences: %" GST_PTR_FORMAT, rtp_trans->codec_preferences); ret = gst_caps_ref (rtp_trans->codec_preferences); } else { GstWebRTCBinPad *pad = NULL; /* try to find a pad */ if (!trans || !(pad = _find_pad_for_transceiver (webrtc, direction, rtp_trans))) pad = _find_pad_for_mline (webrtc, direction, media_idx); if (!pad) { if (trans && trans->last_configured_caps) ret = gst_caps_ref (trans->last_configured_caps); } else { GstCaps *caps = NULL; if (pad->received_caps) { caps = gst_caps_ref (pad->received_caps); } else if ((caps = gst_pad_get_current_caps (GST_PAD (pad)))) { GST_LOG_OBJECT (webrtc, "Using current pad caps: %" GST_PTR_FORMAT, caps); } else { if ((caps = gst_pad_peer_query_caps (GST_PAD (pad), NULL))) GST_LOG_OBJECT (webrtc, "Using peer query caps: %" GST_PTR_FORMAT, caps); } if (caps) { if (trans) gst_caps_replace (&trans->last_configured_caps, caps); ret = caps; } gst_object_unref (pad); } } if (!ret) GST_DEBUG_OBJECT (trans, "Could not find caps for mline %u", media_idx); return ret; } static GstCaps * _add_supported_attributes_to_caps (GstWebRTCBin * webrtc, WebRTCTransceiver * trans, const GstCaps * caps) { GstCaps *ret; guint i; ret = gst_caps_make_writable (caps); for (i = 0; i < gst_caps_get_size (ret); i++) { GstStructure *s = gst_caps_get_structure (ret, i); if (trans->do_nack) if (!gst_structure_has_field (s, "rtcp-fb-nack")) gst_structure_set (s, "rtcp-fb-nack", G_TYPE_BOOLEAN, TRUE, NULL); if (!gst_structure_has_field (s, "rtcp-fb-nack-pli")) gst_structure_set (s, "rtcp-fb-nack-pli", G_TYPE_BOOLEAN, TRUE, NULL); /* FIXME: is this needed? */ /*if (!gst_structure_has_field (s, "rtcp-fb-transport-cc")) gst_structure_set (s, "rtcp-fb-nack-pli", G_TYPE_BOOLEAN, TRUE, NULL); */ /* FIXME: codec-specific parameters? */ } return ret; } static void _on_ice_transport_notify_state (GstWebRTCICETransport * transport, GParamSpec * pspec, GstWebRTCBin * webrtc) { _update_ice_connection_state (webrtc); _update_peer_connection_state (webrtc); } static void _on_ice_transport_notify_gathering_state (GstWebRTCICETransport * transport, GParamSpec * pspec, GstWebRTCBin * webrtc) { _update_ice_gathering_state (webrtc); } static void _on_dtls_transport_notify_state (GstWebRTCDTLSTransport * transport, GParamSpec * pspec, GstWebRTCBin * webrtc) { _update_peer_connection_state (webrtc); } static WebRTCTransceiver * _create_webrtc_transceiver (GstWebRTCBin * webrtc, GstWebRTCRTPTransceiverDirection direction, guint mline) { WebRTCTransceiver *trans; GstWebRTCRTPTransceiver *rtp_trans; GstWebRTCRTPSender *sender; GstWebRTCRTPReceiver *receiver; sender = gst_webrtc_rtp_sender_new (); receiver = gst_webrtc_rtp_receiver_new (); trans = webrtc_transceiver_new (webrtc, sender, receiver); rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans); rtp_trans->direction = direction; rtp_trans->mline = mline; /* FIXME: We don't support stopping transceiver yet so they're always not stopped */ rtp_trans->stopped = FALSE; g_ptr_array_add (webrtc->priv->transceivers, trans); gst_object_unref (sender); gst_object_unref (receiver); g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_NEW_TRANSCEIVER_SIGNAL], 0, trans); return trans; } static TransportStream * _create_transport_channel (GstWebRTCBin * webrtc, guint session_id) { GstWebRTCDTLSTransport *transport; TransportStream *ret; /* FIXME: how to parametrize the sender and the receiver */ ret = transport_stream_new (webrtc, session_id); transport = ret->transport; g_signal_connect (G_OBJECT (transport->transport), "notify::state", G_CALLBACK (_on_ice_transport_notify_state), webrtc); g_signal_connect (G_OBJECT (transport->transport), "notify::gathering-state", G_CALLBACK (_on_ice_transport_notify_gathering_state), webrtc); g_signal_connect (G_OBJECT (transport), "notify::state", G_CALLBACK (_on_dtls_transport_notify_state), webrtc); if ((transport = ret->rtcp_transport)) { g_signal_connect (G_OBJECT (transport->transport), "notify::state", G_CALLBACK (_on_ice_transport_notify_state), webrtc); g_signal_connect (G_OBJECT (transport->transport), "notify::gathering-state", G_CALLBACK (_on_ice_transport_notify_gathering_state), webrtc); g_signal_connect (G_OBJECT (transport), "notify::state", G_CALLBACK (_on_dtls_transport_notify_state), webrtc); } GST_TRACE_OBJECT (webrtc, "Create transport %" GST_PTR_FORMAT " for session %u", ret, session_id); return ret; } static TransportStream * _get_or_create_rtp_transport_channel (GstWebRTCBin * webrtc, guint session_id) { TransportStream *ret; gchar *pad_name; ret = _find_transport_for_session (webrtc, session_id); if (!ret) { ret = _create_transport_channel (webrtc, session_id); gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (ret->send_bin)); gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (ret->receive_bin)); g_ptr_array_add (webrtc->priv->transports, ret); pad_name = g_strdup_printf ("recv_rtcp_sink_%u", ret->session_id); if (!gst_element_link_pads (GST_ELEMENT (ret->receive_bin), "rtcp_src", GST_ELEMENT (webrtc->rtpbin), pad_name)) g_warn_if_reached (); g_free (pad_name); pad_name = g_strdup_printf ("send_rtcp_src_%u", ret->session_id); if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name, GST_ELEMENT (ret->send_bin), "rtcp_sink")) g_warn_if_reached (); g_free (pad_name); } gst_element_sync_state_with_parent (GST_ELEMENT (ret->send_bin)); gst_element_sync_state_with_parent (GST_ELEMENT (ret->receive_bin)); return ret; } /* this is called from the webrtc thread with the pc lock held */ static void _on_data_channel_ready_state (GstWebRTCDataChannel * channel, GParamSpec * pspec, GstWebRTCBin * webrtc) { GstWebRTCDataChannelState ready_state; guint i; g_object_get (channel, "ready-state", &ready_state, NULL); if (ready_state == GST_WEBRTC_DATA_CHANNEL_STATE_OPEN) { gboolean found = FALSE; for (i = 0; i < webrtc->priv->pending_data_channels->len; i++) { GstWebRTCDataChannel *c; c = g_ptr_array_index (webrtc->priv->pending_data_channels, i); if (c == channel) { found = TRUE; g_ptr_array_remove_index (webrtc->priv->pending_data_channels, i); break; } } if (found == FALSE) { GST_FIXME_OBJECT (webrtc, "Received open for unknown data channel"); return; } g_ptr_array_add (webrtc->priv->data_channels, channel); g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_DATA_CHANNEL_SIGNAL], 0, gst_object_ref (channel)); } } static void _on_sctpdec_pad_added (GstElement * sctpdec, GstPad * pad, GstWebRTCBin * webrtc) { GstWebRTCDataChannel *channel; guint stream_id; GstPad *sink_pad; if (sscanf (GST_PAD_NAME (pad), "src_%u", &stream_id) != 1) return; PC_LOCK (webrtc); channel = _find_data_channel_for_id (webrtc, stream_id); if (!channel) { channel = g_object_new (GST_TYPE_WEBRTC_DATA_CHANNEL, NULL); channel->id = stream_id; channel->webrtcbin = webrtc; gst_bin_add (GST_BIN (webrtc), channel->appsrc); gst_bin_add (GST_BIN (webrtc), channel->appsink); gst_element_sync_state_with_parent (channel->appsrc); gst_element_sync_state_with_parent (channel->appsink); gst_webrtc_data_channel_link_to_sctp (channel, webrtc->priv->sctp_transport); g_ptr_array_add (webrtc->priv->pending_data_channels, channel); } g_signal_connect (channel, "notify::ready-state", G_CALLBACK (_on_data_channel_ready_state), webrtc); sink_pad = gst_element_get_static_pad (channel->appsink, "sink"); if (gst_pad_link (pad, sink_pad) != GST_PAD_LINK_OK) GST_WARNING_OBJECT (channel, "Failed to link sctp pad %s with channel %" GST_PTR_FORMAT, GST_PAD_NAME (pad), channel); gst_object_unref (sink_pad); PC_UNLOCK (webrtc); } static void _on_sctp_state_notify (GstWebRTCSCTPTransport * sctp, GParamSpec * pspec, GstWebRTCBin * webrtc) { GstWebRTCSCTPTransportState state; g_object_get (sctp, "state", &state, NULL); if (state == GST_WEBRTC_SCTP_TRANSPORT_STATE_CONNECTED) { int i; PC_LOCK (webrtc); GST_DEBUG_OBJECT (webrtc, "SCTP association established"); for (i = 0; i < webrtc->priv->data_channels->len; i++) { GstWebRTCDataChannel *channel; channel = g_ptr_array_index (webrtc->priv->data_channels, i); gst_webrtc_data_channel_link_to_sctp (channel, webrtc->priv->sctp_transport); if (!channel->negotiated && !channel->opened) gst_webrtc_data_channel_start_negotiation (channel); } PC_UNLOCK (webrtc); } } /* Forward declaration so we can easily disconnect the signal handler */ static void _on_sctp_notify_dtls_state (GstWebRTCDTLSTransport * transport, GParamSpec * pspec, GstWebRTCBin * webrtc); static void _sctp_check_dtls_state_task (GstWebRTCBin * webrtc, gpointer unused) { TransportStream *stream; GstWebRTCDTLSTransport *transport; GstWebRTCDTLSTransportState dtls_state; GstWebRTCSCTPTransport *sctp_transport; stream = webrtc->priv->data_channel_transport; transport = stream->transport; g_object_get (transport, "state", &dtls_state, NULL); /* Not connected yet so just return */ if (dtls_state != GST_WEBRTC_DTLS_TRANSPORT_STATE_CONNECTED) { GST_DEBUG_OBJECT (webrtc, "Data channel DTLS connection is not ready yet: %d", dtls_state); return; } GST_DEBUG_OBJECT (webrtc, "Data channel DTLS connection is now ready"); sctp_transport = webrtc->priv->sctp_transport; /* Not locked state anymore so this was already taken care of before */ if (!gst_element_is_locked_state (sctp_transport->sctpdec)) return; /* Start up the SCTP elements now that the DTLS connection is established */ gst_element_set_locked_state (sctp_transport->sctpdec, FALSE); gst_element_set_locked_state (sctp_transport->sctpenc, FALSE); gst_element_sync_state_with_parent (GST_ELEMENT (sctp_transport->sctpdec)); gst_element_sync_state_with_parent (GST_ELEMENT (sctp_transport->sctpenc)); if (sctp_transport->sctpdec_block_id) { GstPad *receive_srcpad; receive_srcpad = gst_element_get_static_pad (GST_ELEMENT (stream->receive_bin), "data_src"); gst_pad_remove_probe (receive_srcpad, sctp_transport->sctpdec_block_id); sctp_transport->sctpdec_block_id = 0; gst_object_unref (receive_srcpad); } g_signal_handlers_disconnect_by_func (transport, _on_sctp_notify_dtls_state, webrtc); } static void _on_sctp_notify_dtls_state (GstWebRTCDTLSTransport * transport, GParamSpec * pspec, GstWebRTCBin * webrtc) { GstWebRTCDTLSTransportState dtls_state; g_object_get (transport, "state", &dtls_state, NULL); GST_TRACE_OBJECT (webrtc, "Data channel DTLS state changed to %d", dtls_state); /* Connected now, so schedule a task to update the state of the SCTP * elements */ if (dtls_state == GST_WEBRTC_DTLS_TRANSPORT_STATE_CONNECTED) { gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _sctp_check_dtls_state_task, NULL, NULL); } } static GstPadProbeReturn sctp_pad_block (GstPad * pad, GstPadProbeInfo * info, gpointer unused) { /* Drop all events: we don't care about them and don't want to block on * them. Sticky events would be forwarded again later once we unblock * and we don't want to forward them here already because that might * cause a spurious GST_FLOW_FLUSHING */ if (GST_IS_EVENT (info->data)) return GST_PAD_PROBE_DROP; /* But block on any actual data-flow so we don't accidentally send that * to a pad that is not ready yet, causing GST_FLOW_FLUSHING and everything * to silently stop. */ GST_LOG_OBJECT (pad, "blocking pad with data %" GST_PTR_FORMAT, info->data); return GST_PAD_PROBE_OK; } static TransportStream * _get_or_create_data_channel_transports (GstWebRTCBin * webrtc, guint session_id) { if (!webrtc->priv->data_channel_transport) { TransportStream *stream; GstWebRTCSCTPTransport *sctp_transport; int i; stream = _find_transport_for_session (webrtc, session_id); if (!stream) { stream = _create_transport_channel (webrtc, session_id); gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (stream->send_bin)); gst_bin_add (GST_BIN (webrtc), GST_ELEMENT (stream->receive_bin)); g_ptr_array_add (webrtc->priv->transports, stream); } webrtc->priv->data_channel_transport = stream; g_object_set (stream, "rtcp-mux", TRUE, NULL); if (!(sctp_transport = webrtc->priv->sctp_transport)) { sctp_transport = gst_webrtc_sctp_transport_new (); sctp_transport->transport = g_object_ref (webrtc->priv->data_channel_transport->transport); sctp_transport->webrtcbin = webrtc; /* Don't automatically start SCTP elements as part of webrtcbin. We * need to delay this until the DTLS transport is fully connected! */ gst_element_set_locked_state (sctp_transport->sctpdec, TRUE); gst_element_set_locked_state (sctp_transport->sctpenc, TRUE); gst_bin_add (GST_BIN (webrtc), sctp_transport->sctpdec); gst_bin_add (GST_BIN (webrtc), sctp_transport->sctpenc); } g_signal_connect (sctp_transport->sctpdec, "pad-added", G_CALLBACK (_on_sctpdec_pad_added), webrtc); g_signal_connect (sctp_transport, "notify::state", G_CALLBACK (_on_sctp_state_notify), webrtc); if (sctp_transport->sctpdec_block_id == 0) { GstPad *receive_srcpad; receive_srcpad = gst_element_get_static_pad (GST_ELEMENT (stream->receive_bin), "data_src"); sctp_transport->sctpdec_block_id = gst_pad_add_probe (receive_srcpad, GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_DATA_DOWNSTREAM, (GstPadProbeCallback) sctp_pad_block, NULL, NULL); gst_object_unref (receive_srcpad); } if (!gst_element_link_pads (GST_ELEMENT (stream->receive_bin), "data_src", GST_ELEMENT (sctp_transport->sctpdec), "sink")) g_warn_if_reached (); if (!gst_element_link_pads (GST_ELEMENT (sctp_transport->sctpenc), "src", GST_ELEMENT (stream->send_bin), "data_sink")) g_warn_if_reached (); for (i = 0; i < webrtc->priv->data_channels->len; i++) { GstWebRTCDataChannel *channel; channel = g_ptr_array_index (webrtc->priv->data_channels, i); gst_webrtc_data_channel_link_to_sctp (channel, webrtc->priv->sctp_transport); } gst_element_sync_state_with_parent (GST_ELEMENT (stream->send_bin)); gst_element_sync_state_with_parent (GST_ELEMENT (stream->receive_bin)); if (!webrtc->priv->sctp_transport) { /* Connect to the notify::state signal to get notified when the DTLS * connection is established. Only then can we start the SCTP elements */ g_signal_connect (stream->transport, "notify::state", G_CALLBACK (_on_sctp_notify_dtls_state), webrtc); /* As this would be racy otherwise, also schedule a task that checks the * current state of the connection already without getting the signal * called */ gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _sctp_check_dtls_state_task, NULL, NULL); } webrtc->priv->sctp_transport = sctp_transport; } return webrtc->priv->data_channel_transport; } static TransportStream * _get_or_create_transport_stream (GstWebRTCBin * webrtc, guint session_id, gboolean is_datachannel) { if (is_datachannel) return _get_or_create_data_channel_transports (webrtc, session_id); else return _get_or_create_rtp_transport_channel (webrtc, session_id); } static guint g_array_find_uint (GArray * array, guint val) { guint i; for (i = 0; i < array->len; i++) { if (g_array_index (array, guint, i) == val) return i; } return G_MAXUINT; } static gboolean _pick_available_pt (GArray * reserved_pts, guint * i) { gboolean ret = FALSE; for (*i = 96; *i <= 127; (*i)++) { if (g_array_find_uint (reserved_pts, *i) == G_MAXUINT) { g_array_append_val (reserved_pts, *i); ret = TRUE; break; } } return ret; } static gboolean _pick_fec_payload_types (GstWebRTCBin * webrtc, WebRTCTransceiver * trans, GArray * reserved_pts, gint clockrate, gint * rtx_target_pt, GstSDPMedia * media) { gboolean ret = TRUE; if (trans->fec_type == GST_WEBRTC_FEC_TYPE_NONE) goto done; if (trans->fec_type == GST_WEBRTC_FEC_TYPE_ULP_RED && clockrate != -1) { guint pt; gchar *str; if (!(ret = _pick_available_pt (reserved_pts, &pt))) goto done; /* https://tools.ietf.org/html/rfc5109#section-14.1 */ str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u red/%d", pt, clockrate); gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); *rtx_target_pt = pt; if (!(ret = _pick_available_pt (reserved_pts, &pt))) goto done; str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u ulpfec/%d", pt, clockrate); gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); } done: return ret; } static gboolean _pick_rtx_payload_types (GstWebRTCBin * webrtc, WebRTCTransceiver * trans, GArray * reserved_pts, gint clockrate, gint target_pt, guint target_ssrc, GstSDPMedia * media) { gboolean ret = TRUE; if (trans->local_rtx_ssrc_map) gst_structure_free (trans->local_rtx_ssrc_map); trans->local_rtx_ssrc_map = gst_structure_new_empty ("application/x-rtp-ssrc-map"); if (trans->do_nack) { guint pt; gchar *str; if (!(ret = _pick_available_pt (reserved_pts, &pt))) goto done; /* https://tools.ietf.org/html/rfc4588#section-8.6 */ str = g_strdup_printf ("%u", target_ssrc); gst_structure_set (trans->local_rtx_ssrc_map, str, G_TYPE_UINT, g_random_int (), NULL); g_free (str); str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u rtx/%d", pt, clockrate); gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); str = g_strdup_printf ("%u apt=%d", pt, target_pt); gst_sdp_media_add_attribute (media, "fmtp", str); g_free (str); } done: return ret; } /* https://tools.ietf.org/html/rfc5576#section-4.2 */ static gboolean _media_add_rtx_ssrc_group (GQuark field_id, const GValue * value, GstSDPMedia * media) { gchar *str; str = g_strdup_printf ("FID %s %u", g_quark_to_string (field_id), g_value_get_uint (value)); gst_sdp_media_add_attribute (media, "ssrc-group", str); g_free (str); return TRUE; } typedef struct { GstSDPMedia *media; GstWebRTCBin *webrtc; WebRTCTransceiver *trans; } RtxSsrcData; static gboolean _media_add_rtx_ssrc (GQuark field_id, const GValue * value, RtxSsrcData * data) { gchar *str; GstStructure *sdes; const gchar *cname; g_object_get (data->webrtc->rtpbin, "sdes", &sdes, NULL); /* http://www.freesoft.org/CIE/RFC/1889/24.htm */ cname = gst_structure_get_string (sdes, "cname"); /* https://tools.ietf.org/html/draft-ietf-mmusic-msid-16 */ str = g_strdup_printf ("%u msid:%s %s", g_value_get_uint (value), cname, GST_OBJECT_NAME (data->trans)); gst_sdp_media_add_attribute (data->media, "ssrc", str); g_free (str); str = g_strdup_printf ("%u cname:%s", g_value_get_uint (value), cname); gst_sdp_media_add_attribute (data->media, "ssrc", str); g_free (str); gst_structure_free (sdes); return TRUE; } static void _media_add_ssrcs (GstSDPMedia * media, GstCaps * caps, GstWebRTCBin * webrtc, WebRTCTransceiver * trans) { guint i; RtxSsrcData data = { media, webrtc, trans }; const gchar *cname; GstStructure *sdes; g_object_get (webrtc->rtpbin, "sdes", &sdes, NULL); /* http://www.freesoft.org/CIE/RFC/1889/24.htm */ cname = gst_structure_get_string (sdes, "cname"); if (trans->local_rtx_ssrc_map) gst_structure_foreach (trans->local_rtx_ssrc_map, (GstStructureForeachFunc) _media_add_rtx_ssrc_group, media); for (i = 0; i < gst_caps_get_size (caps); i++) { const GstStructure *s = gst_caps_get_structure (caps, i); guint ssrc; if (gst_structure_get_uint (s, "ssrc", &ssrc)) { gchar *str; /* https://tools.ietf.org/html/draft-ietf-mmusic-msid-16 */ str = g_strdup_printf ("%u msid:%s %s", ssrc, cname, GST_OBJECT_NAME (trans)); gst_sdp_media_add_attribute (media, "ssrc", str); g_free (str); str = g_strdup_printf ("%u cname:%s", ssrc, cname); gst_sdp_media_add_attribute (media, "ssrc", str); g_free (str); } } gst_structure_free (sdes); if (trans->local_rtx_ssrc_map) gst_structure_foreach (trans->local_rtx_ssrc_map, (GstStructureForeachFunc) _media_add_rtx_ssrc, &data); } static void _add_fingerprint_to_media (GstWebRTCDTLSTransport * transport, GstSDPMedia * media) { gchar *cert, *fingerprint, *val; g_object_get (transport, "certificate", &cert, NULL); fingerprint = _generate_fingerprint_from_certificate (cert, G_CHECKSUM_SHA256); g_free (cert); val = g_strdup_printf ("%s %s", _g_checksum_to_webrtc_string (G_CHECKSUM_SHA256), fingerprint); g_free (fingerprint); gst_sdp_media_add_attribute (media, "fingerprint", val); g_free (val); } /* based off https://tools.ietf.org/html/draft-ietf-rtcweb-jsep-18#section-5.2.1 */ static gboolean sdp_media_from_transceiver (GstWebRTCBin * webrtc, GstSDPMedia * media, GstWebRTCRTPTransceiver * trans, GstWebRTCSDPType type, guint media_idx, GString * bundled_mids, guint bundle_idx, gchar * bundle_ufrag, gchar * bundle_pwd, GArray * reserved_pts) { /* TODO: * rtp header extensions * ice attributes * rtx * fec * msid-semantics * msid * dtls fingerprints * multiple dtls fingerprints https://tools.ietf.org/html/draft-ietf-mmusic-4572-update-05 */ GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc); gchar *direction, *sdp_mid, *ufrag, *pwd; gboolean bundle_only; GstCaps *caps; int i; if (trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE || trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) return FALSE; g_assert (trans->mline == -1 || trans->mline == media_idx); bundle_only = bundled_mids && bundle_idx != media_idx && webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE; /* mandated by JSEP */ gst_sdp_media_add_attribute (media, "setup", "actpass"); /* FIXME: deal with ICE restarts */ if (last_offer && trans->mline != -1 && trans->mid) { ufrag = g_strdup (_media_get_ice_ufrag (last_offer, trans->mline)); pwd = g_strdup (_media_get_ice_pwd (last_offer, trans->mline)); GST_DEBUG_OBJECT (trans, "%u Using previous ice parameters", media_idx); } else { GST_DEBUG_OBJECT (trans, "%u Generating new ice parameters mline %i, mid %s", media_idx, trans->mline, trans->mid); if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) { _generate_ice_credentials (&ufrag, &pwd); } else { g_assert (bundle_ufrag && bundle_pwd); ufrag = g_strdup (bundle_ufrag); pwd = g_strdup (bundle_pwd); } } gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag); gst_sdp_media_add_attribute (media, "ice-pwd", pwd); g_free (ufrag); g_free (pwd); gst_sdp_media_set_port_info (media, bundle_only || trans->stopped ? 0 : 9, 0); gst_sdp_media_set_proto (media, "UDP/TLS/RTP/SAVPF"); gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0); if (bundle_only) { gst_sdp_media_add_attribute (media, "bundle-only", NULL); } /* FIXME: negotiate this */ /* FIXME: when bundle_only, these should not be added: * https://tools.ietf.org/html/draft-ietf-mmusic-sdp-bundle-negotiation-52#section-7.1.3 * However, this causes incompatibilities with current versions * of the major browsers */ gst_sdp_media_add_attribute (media, "rtcp-mux", ""); gst_sdp_media_add_attribute (media, "rtcp-rsize", NULL); direction = _enum_value_to_string (GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, trans->direction); gst_sdp_media_add_attribute (media, direction, ""); g_free (direction); if (type == GST_WEBRTC_SDP_TYPE_OFFER) { caps = _find_codec_preferences (webrtc, trans, GST_PAD_SINK, media_idx); caps = _add_supported_attributes_to_caps (webrtc, WEBRTC_TRANSCEIVER (trans), caps); } else { g_assert_not_reached (); } if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) { GST_WARNING_OBJECT (webrtc, "no caps available for transceiver, skipping"); if (caps) gst_caps_unref (caps); return FALSE; } for (i = 0; i < gst_caps_get_size (caps); i++) { GstCaps *format = gst_caps_new_empty (); const GstStructure *s = gst_caps_get_structure (caps, i); gst_caps_append_structure (format, gst_structure_copy (s)); GST_DEBUG_OBJECT (webrtc, "Adding %u-th caps %" GST_PTR_FORMAT " to %u-th media", i, format, media_idx); /* this only looks at the first structure so we loop over the given caps * and add each structure inside it piecemeal */ gst_sdp_media_set_media_from_caps (format, media); gst_caps_unref (format); } if (type == GST_WEBRTC_SDP_TYPE_OFFER) { const GstStructure *s = gst_caps_get_structure (caps, 0); gint clockrate = -1; gint rtx_target_pt; gint original_rtx_target_pt; /* Workaround chrome bug: https://bugs.chromium.org/p/webrtc/issues/detail?id=6196 */ guint rtx_target_ssrc = -1; if (gst_structure_get_int (s, "payload", &rtx_target_pt) && webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) g_array_append_val (reserved_pts, rtx_target_pt); original_rtx_target_pt = rtx_target_pt; if (!gst_structure_get_int (s, "clock-rate", &clockrate)) GST_WARNING_OBJECT (webrtc, "Caps %" GST_PTR_FORMAT " are missing clock-rate", caps); if (!gst_structure_get_uint (s, "ssrc", &rtx_target_ssrc)) GST_WARNING_OBJECT (webrtc, "Caps %" GST_PTR_FORMAT " are missing ssrc", caps); _pick_fec_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts, clockrate, &rtx_target_pt, media); _pick_rtx_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts, clockrate, rtx_target_pt, rtx_target_ssrc, media); if (original_rtx_target_pt != rtx_target_pt) _pick_rtx_payload_types (webrtc, WEBRTC_TRANSCEIVER (trans), reserved_pts, clockrate, original_rtx_target_pt, rtx_target_ssrc, media); } _media_add_ssrcs (media, caps, webrtc, WEBRTC_TRANSCEIVER (trans)); /* Some identifier; we also add the media name to it so it's identifiable */ if (trans->mid) { gst_sdp_media_add_attribute (media, "mid", trans->mid); } else { sdp_mid = g_strdup_printf ("%s%u", gst_sdp_media_get_media (media), webrtc->priv->media_counter++); gst_sdp_media_add_attribute (media, "mid", sdp_mid); g_free (sdp_mid); } /* TODO: * - add a=candidate lines for gathered candidates */ if (trans->sender) { if (!trans->sender->transport) { TransportStream *item; item = _get_or_create_transport_stream (webrtc, bundled_mids ? bundle_idx : media_idx, FALSE); webrtc_transceiver_set_transport (WEBRTC_TRANSCEIVER (trans), item); } _add_fingerprint_to_media (trans->sender->transport, media); } if (bundled_mids) { const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid"); g_assert (mid); g_string_append_printf (bundled_mids, " %s", mid); } gst_caps_unref (caps); return TRUE; } static void gather_pad_pt (GstWebRTCBinPad * pad, GArray * reserved_pts) { if (pad->received_caps) { GstStructure *s = gst_caps_get_structure (pad->received_caps, 0); gint pt; if (gst_structure_get_int (s, "payload", &pt)) { g_array_append_val (reserved_pts, pt); } } } static GArray * gather_reserved_pts (GstWebRTCBin * webrtc) { GstElement *element = GST_ELEMENT (webrtc); GArray *reserved_pts = g_array_new (FALSE, FALSE, sizeof (guint)); GST_OBJECT_LOCK (webrtc); g_list_foreach (element->sinkpads, (GFunc) gather_pad_pt, reserved_pts); g_list_foreach (webrtc->priv->pending_pads, (GFunc) gather_pad_pt, reserved_pts); GST_OBJECT_UNLOCK (webrtc); return reserved_pts; } static gboolean _add_data_channel_offer (GstWebRTCBin * webrtc, GstSDPMessage * msg, GstSDPMedia * media, GString * bundled_mids, guint bundle_idx, gchar * bundle_ufrag, gchar * bundle_pwd) { GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc); gchar *ufrag, *pwd, *sdp_mid; gboolean bundle_only = bundled_mids && webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE && gst_sdp_message_medias_len (msg) != bundle_idx; guint last_data_index = G_MAXUINT; /* add data channel support */ if (webrtc->priv->data_channels->len == 0) return FALSE; if (last_offer) { last_data_index = _message_get_datachannel_index (last_offer); if (last_data_index < G_MAXUINT) { g_assert (last_data_index < gst_sdp_message_medias_len (last_offer)); /* XXX: is this always true when recycling transceivers? * i.e. do we always put the data channel in the same mline */ g_assert (last_data_index == gst_sdp_message_medias_len (msg)); } } /* mandated by JSEP */ gst_sdp_media_add_attribute (media, "setup", "actpass"); /* FIXME: only needed when restarting ICE */ if (last_offer && last_data_index < G_MAXUINT) { ufrag = g_strdup (_media_get_ice_ufrag (last_offer, last_data_index)); pwd = g_strdup (_media_get_ice_pwd (last_offer, last_data_index)); } else { if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) { _generate_ice_credentials (&ufrag, &pwd); } else { ufrag = g_strdup (bundle_ufrag); pwd = g_strdup (bundle_pwd); } } gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag); gst_sdp_media_add_attribute (media, "ice-pwd", pwd); g_free (ufrag); g_free (pwd); gst_sdp_media_set_media (media, "application"); gst_sdp_media_set_port_info (media, bundle_only ? 0 : 9, 0); gst_sdp_media_set_proto (media, "UDP/DTLS/SCTP"); gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0); gst_sdp_media_add_format (media, "webrtc-datachannel"); if (bundle_idx != gst_sdp_message_medias_len (msg)) gst_sdp_media_add_attribute (media, "bundle-only", NULL); if (last_offer && last_data_index < G_MAXUINT) { const GstSDPMedia *last_data_media; const gchar *mid; last_data_media = gst_sdp_message_get_media (last_offer, last_data_index); mid = gst_sdp_media_get_attribute_val (last_data_media, "mid"); gst_sdp_media_add_attribute (media, "mid", mid); } else { sdp_mid = g_strdup_printf ("%s%u", gst_sdp_media_get_media (media), webrtc->priv->media_counter++); gst_sdp_media_add_attribute (media, "mid", sdp_mid); g_free (sdp_mid); } if (bundled_mids) { const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid"); g_assert (mid); g_string_append_printf (bundled_mids, " %s", mid); } /* FIXME: negotiate this properly */ gst_sdp_media_add_attribute (media, "sctp-port", "5000"); _get_or_create_data_channel_transports (webrtc, bundled_mids ? 0 : webrtc->priv->transceivers->len); _add_fingerprint_to_media (webrtc->priv->sctp_transport->transport, media); return TRUE; } /* TODO: use the options argument */ static GstSDPMessage * _create_offer_task (GstWebRTCBin * webrtc, const GstStructure * options) { GstSDPMessage *ret; GString *bundled_mids = NULL; gchar *bundle_ufrag = NULL; gchar *bundle_pwd = NULL; GArray *reserved_pts = NULL; GstSDPMessage *last_offer = _get_latest_self_generated_sdp (webrtc); GList *seen_transceivers = NULL; guint media_idx = 0; int i; gst_sdp_message_new (&ret); gst_sdp_message_set_version (ret, "0"); { gchar *v, *sess_id; v = g_strdup_printf ("%u", webrtc->priv->offer_count++); if (last_offer) { const GstSDPOrigin *origin = gst_sdp_message_get_origin (last_offer); sess_id = g_strdup (origin->sess_id); } else { sess_id = g_strdup_printf ("%" G_GUINT64_FORMAT, RANDOM_SESSION_ID); } gst_sdp_message_set_origin (ret, "-", sess_id, v, "IN", "IP4", "0.0.0.0"); g_free (sess_id); g_free (v); } gst_sdp_message_set_session_name (ret, "-"); gst_sdp_message_add_time (ret, "0", "0", NULL); gst_sdp_message_add_attribute (ret, "ice-options", "trickle"); if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_BUNDLE) { bundled_mids = g_string_new ("BUNDLE"); } else if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_MAX_COMPAT) { bundled_mids = g_string_new ("BUNDLE"); } if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) { GStrv last_bundle = NULL; guint bundle_media_index; reserved_pts = gather_reserved_pts (webrtc); if (last_offer && _parse_bundle (last_offer, &last_bundle) && last_bundle && last_bundle && last_bundle[0] && _get_bundle_index (last_offer, last_bundle, &bundle_media_index)) { bundle_ufrag = g_strdup (_media_get_ice_ufrag (last_offer, bundle_media_index)); bundle_pwd = g_strdup (_media_get_ice_pwd (last_offer, bundle_media_index)); } else { _generate_ice_credentials (&bundle_ufrag, &bundle_pwd); } g_strfreev (last_bundle); } /* FIXME: recycle transceivers */ /* Fill up the renegotiated streams first */ if (last_offer) { for (i = 0; i < gst_sdp_message_medias_len (last_offer); i++) { GstWebRTCRTPTransceiver *trans = NULL; const GstSDPMedia *last_media; last_media = gst_sdp_message_get_media (last_offer, i); if (g_strcmp0 (gst_sdp_media_get_media (last_media), "audio") == 0 || g_strcmp0 (gst_sdp_media_get_media (last_media), "video") == 0) { const gchar *last_mid; int j; last_mid = gst_sdp_media_get_attribute_val (last_media, "mid"); for (j = 0; j < webrtc->priv->transceivers->len; j++) { trans = g_ptr_array_index (webrtc->priv->transceivers, j); if (trans->mid && g_strcmp0 (trans->mid, last_mid) == 0) { GstSDPMedia *media; g_assert (!g_list_find (seen_transceivers, trans)); GST_LOG_OBJECT (webrtc, "using previous negotiatied transceiver %" GST_PTR_FORMAT " with mid %s into media index %u", trans, trans->mid, media_idx); /* FIXME: deal with format changes */ gst_sdp_media_copy (last_media, &media); _media_replace_direction (media, trans->direction); if (bundled_mids) { const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid"); g_assert (mid); g_string_append_printf (bundled_mids, " %s", mid); } gst_sdp_message_add_media (ret, media); media_idx++; gst_sdp_media_free (media); seen_transceivers = g_list_prepend (seen_transceivers, trans); break; } } } else if (g_strcmp0 (gst_sdp_media_get_media (last_media), "application") == 0) { GstSDPMedia media = { 0, }; gst_sdp_media_init (&media); if (_add_data_channel_offer (webrtc, ret, &media, bundled_mids, 0, bundle_ufrag, bundle_pwd)) { gst_sdp_message_add_media (ret, &media); media_idx++; } else { gst_sdp_media_uninit (&media); } } } } /* add any extra streams */ for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *trans; GstSDPMedia media = { 0, }; trans = g_ptr_array_index (webrtc->priv->transceivers, i); /* don't add transceivers twice */ if (g_list_find (seen_transceivers, trans)) continue; /* don't add stopped transceivers */ if (trans->stopped) continue; gst_sdp_media_init (&media); if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) { reserved_pts = g_array_new (FALSE, FALSE, sizeof (guint)); } GST_LOG_OBJECT (webrtc, "adding transceiver %" GST_PTR_FORMAT " at media " "index %u", trans, media_idx); if (sdp_media_from_transceiver (webrtc, &media, trans, GST_WEBRTC_SDP_TYPE_OFFER, media_idx, bundled_mids, 0, bundle_ufrag, bundle_pwd, reserved_pts)) { gst_sdp_message_add_media (ret, &media); media_idx++; } else { gst_sdp_media_uninit (&media); } if (webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) { g_array_free (reserved_pts, TRUE); } seen_transceivers = g_list_prepend (seen_transceivers, trans); } if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) { g_array_free (reserved_pts, TRUE); } /* add a data channel if exists and not renegotiated */ if (_message_get_datachannel_index (ret) == G_MAXUINT) { GstSDPMedia media = { 0, }; gst_sdp_media_init (&media); if (_add_data_channel_offer (webrtc, ret, &media, bundled_mids, 0, bundle_ufrag, bundle_pwd)) { gst_sdp_message_add_media (ret, &media); media_idx++; } else { gst_sdp_media_uninit (&media); } } g_assert (media_idx == gst_sdp_message_medias_len (ret)); if (bundled_mids) { gchar *mids = g_string_free (bundled_mids, FALSE); gst_sdp_message_add_attribute (ret, "group", mids); g_free (mids); } if (bundle_ufrag) g_free (bundle_ufrag); if (bundle_pwd) g_free (bundle_pwd); /* FIXME: pre-emptively setup receiving elements when needed */ /* XXX: only true for the initial offerer */ g_object_set (webrtc->priv->ice, "controller", TRUE, NULL); g_list_free (seen_transceivers); if (webrtc->priv->last_generated_answer) gst_webrtc_session_description_free (webrtc->priv->last_generated_answer); webrtc->priv->last_generated_answer = NULL; if (webrtc->priv->last_generated_offer) gst_webrtc_session_description_free (webrtc->priv->last_generated_offer); { GstSDPMessage *copy; gst_sdp_message_copy (ret, ©); webrtc->priv->last_generated_offer = gst_webrtc_session_description_new (GST_WEBRTC_SDP_TYPE_OFFER, copy); } return ret; } static void _media_add_fec (GstSDPMedia * media, WebRTCTransceiver * trans, GstCaps * caps, gint * rtx_target_pt) { guint i; if (trans->fec_type == GST_WEBRTC_FEC_TYPE_NONE) return; for (i = 0; i < gst_caps_get_size (caps); i++) { const GstStructure *s = gst_caps_get_structure (caps, i); if (gst_structure_has_name (s, "application/x-rtp")) { const gchar *encoding_name = gst_structure_get_string (s, "encoding-name"); gint clock_rate; gint pt; if (gst_structure_get_int (s, "clock-rate", &clock_rate) && gst_structure_get_int (s, "payload", &pt)) { if (!g_strcmp0 (encoding_name, "RED")) { gchar *str; str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u red/%d", pt, clock_rate); *rtx_target_pt = pt; gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); } else if (!g_strcmp0 (encoding_name, "ULPFEC")) { gchar *str; str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u ulpfec/%d", pt, clock_rate); gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); } } } } } static void _media_add_rtx (GstSDPMedia * media, WebRTCTransceiver * trans, GstCaps * offer_caps, gint target_pt, guint target_ssrc) { guint i; const GstStructure *s; if (trans->local_rtx_ssrc_map) gst_structure_free (trans->local_rtx_ssrc_map); trans->local_rtx_ssrc_map = gst_structure_new_empty ("application/x-rtp-ssrc-map"); for (i = 0; i < gst_caps_get_size (offer_caps); i++) { s = gst_caps_get_structure (offer_caps, i); if (gst_structure_has_name (s, "application/x-rtp")) { const gchar *encoding_name = gst_structure_get_string (s, "encoding-name"); const gchar *apt_str = gst_structure_get_string (s, "apt"); gint apt; gint clock_rate; gint pt; if (!apt_str) continue; apt = atoi (apt_str); if (gst_structure_get_int (s, "clock-rate", &clock_rate) && gst_structure_get_int (s, "payload", &pt) && apt == target_pt) { if (!g_strcmp0 (encoding_name, "RTX")) { gchar *str; str = g_strdup_printf ("%u", pt); gst_sdp_media_add_format (media, str); g_free (str); str = g_strdup_printf ("%u rtx/%d", pt, clock_rate); gst_sdp_media_add_attribute (media, "rtpmap", str); g_free (str); str = g_strdup_printf ("%d apt=%d", pt, apt); gst_sdp_media_add_attribute (media, "fmtp", str); g_free (str); str = g_strdup_printf ("%u", target_ssrc); gst_structure_set (trans->local_rtx_ssrc_map, str, G_TYPE_UINT, g_random_int (), NULL); } } } } } static void _get_rtx_target_pt_and_ssrc_from_caps (GstCaps * answer_caps, gint * target_pt, guint * target_ssrc) { const GstStructure *s = gst_caps_get_structure (answer_caps, 0); gst_structure_get_int (s, "payload", target_pt); gst_structure_get_uint (s, "ssrc", target_ssrc); } /* TODO: use the options argument */ static GstSDPMessage * _create_answer_task (GstWebRTCBin * webrtc, const GstStructure * options) { GstSDPMessage *ret = NULL; const GstWebRTCSessionDescription *pending_remote = webrtc->pending_remote_description; guint i; GStrv bundled = NULL; guint bundle_idx = 0; GString *bundled_mids = NULL; gchar *bundle_ufrag = NULL; gchar *bundle_pwd = NULL; GList *seen_transceivers = NULL; GstSDPMessage *last_answer = _get_latest_self_generated_sdp (webrtc); if (!webrtc->pending_remote_description) { GST_ERROR_OBJECT (webrtc, "Asked to create an answer without a remote description"); return NULL; } if (!_parse_bundle (pending_remote->sdp, &bundled)) goto out; if (bundled) { GStrv last_bundle = NULL; guint bundle_media_index; if (!_get_bundle_index (pending_remote->sdp, bundled, &bundle_idx)) { GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching", bundled[0]); goto out; } if (webrtc->bundle_policy != GST_WEBRTC_BUNDLE_POLICY_NONE) { bundled_mids = g_string_new ("BUNDLE"); } if (last_answer && _parse_bundle (last_answer, &last_bundle) && last_bundle && last_bundle[0] && _get_bundle_index (last_answer, last_bundle, &bundle_media_index)) { bundle_ufrag = g_strdup (_media_get_ice_ufrag (last_answer, bundle_media_index)); bundle_pwd = g_strdup (_media_get_ice_pwd (last_answer, bundle_media_index)); } else { _generate_ice_credentials (&bundle_ufrag, &bundle_pwd); } g_strfreev (last_bundle); } gst_sdp_message_new (&ret); gst_sdp_message_set_version (ret, "0"); { const GstSDPOrigin *offer_origin = gst_sdp_message_get_origin (pending_remote->sdp); gst_sdp_message_set_origin (ret, "-", offer_origin->sess_id, offer_origin->sess_version, "IN", "IP4", "0.0.0.0"); } gst_sdp_message_set_session_name (ret, "-"); for (i = 0; i < gst_sdp_message_attributes_len (pending_remote->sdp); i++) { const GstSDPAttribute *attr = gst_sdp_message_get_attribute (pending_remote->sdp, i); if (g_strcmp0 (attr->key, "ice-options") == 0) { gst_sdp_message_add_attribute (ret, attr->key, attr->value); } } for (i = 0; i < gst_sdp_message_medias_len (pending_remote->sdp); i++) { GstSDPMedia *media = NULL; GstSDPMedia *offer_media; GstWebRTCDTLSSetup offer_setup, answer_setup; guint j, k; gboolean bundle_only; const gchar *mid; offer_media = (GstSDPMedia *) gst_sdp_message_get_media (pending_remote->sdp, i); bundle_only = _media_has_attribute_key (offer_media, "bundle-only"); gst_sdp_media_new (&media); if (bundle_only && webrtc->bundle_policy == GST_WEBRTC_BUNDLE_POLICY_NONE) gst_sdp_media_set_port_info (media, 0, 0); else gst_sdp_media_set_port_info (media, 9, 0); gst_sdp_media_add_connection (media, "IN", "IP4", "0.0.0.0", 0, 0); { gchar *ufrag, *pwd; /* FIXME: deal with ICE restarts */ if (last_answer && i < gst_sdp_message_medias_len (last_answer)) { ufrag = g_strdup (_media_get_ice_ufrag (last_answer, i)); pwd = g_strdup (_media_get_ice_pwd (last_answer, i)); } else { if (!bundled) { _generate_ice_credentials (&ufrag, &pwd); } else { ufrag = g_strdup (bundle_ufrag); pwd = g_strdup (bundle_pwd); } } gst_sdp_media_add_attribute (media, "ice-ufrag", ufrag); gst_sdp_media_add_attribute (media, "ice-pwd", pwd); g_free (ufrag); g_free (pwd); } for (j = 0; j < gst_sdp_media_attributes_len (offer_media); j++) { const GstSDPAttribute *attr = gst_sdp_media_get_attribute (offer_media, j); if (g_strcmp0 (attr->key, "mid") == 0 || g_strcmp0 (attr->key, "rtcp-mux") == 0) { gst_sdp_media_add_attribute (media, attr->key, attr->value); /* FIXME: handle anything we want to keep */ } } mid = gst_sdp_media_get_attribute_val (media, "mid"); /* XXX: not strictly required but a lot of functionality requires a mid */ g_assert (mid); /* set the a=setup: attribute */ offer_setup = _get_dtls_setup_from_media (offer_media); answer_setup = _intersect_dtls_setup (offer_setup); if (answer_setup == GST_WEBRTC_DTLS_SETUP_NONE) { GST_WARNING_OBJECT (webrtc, "Could not intersect offer setup with " "transceiver direction"); goto rejected; } _media_replace_setup (media, answer_setup); if (g_strcmp0 (gst_sdp_media_get_media (offer_media), "application") == 0) { int sctp_port; if (gst_sdp_media_formats_len (offer_media) != 1) { GST_WARNING_OBJECT (webrtc, "Could not find a format in the m= line " "for webrtc-datachannel"); goto rejected; } sctp_port = _get_sctp_port_from_media (offer_media); if (sctp_port == -1) { GST_WARNING_OBJECT (webrtc, "media does not contain a sctp port"); goto rejected; } /* XXX: older browsers will produce a different SDP format for data * channel that is currently not parsed correctly */ gst_sdp_media_set_proto (media, "UDP/DTLS/SCTP"); gst_sdp_media_set_media (media, "application"); gst_sdp_media_set_port_info (media, 9, 0); gst_sdp_media_add_format (media, "webrtc-datachannel"); /* FIXME: negotiate this properly on renegotiation */ gst_sdp_media_add_attribute (media, "sctp-port", "5000"); _get_or_create_data_channel_transports (webrtc, bundled_mids ? bundle_idx : i); if (bundled_mids) { g_assert (mid); g_string_append_printf (bundled_mids, " %s", mid); } _add_fingerprint_to_media (webrtc->priv->sctp_transport->transport, media); } else if (g_strcmp0 (gst_sdp_media_get_media (offer_media), "audio") == 0 || g_strcmp0 (gst_sdp_media_get_media (offer_media), "video") == 0) { GstCaps *offer_caps, *answer_caps = NULL; GstWebRTCRTPTransceiver *rtp_trans = NULL; WebRTCTransceiver *trans = NULL; GstWebRTCRTPTransceiverDirection offer_dir, answer_dir; gint target_pt = -1; gint original_target_pt = -1; guint target_ssrc = 0; gst_sdp_media_set_proto (media, "UDP/TLS/RTP/SAVPF"); offer_caps = _rtp_caps_from_media (offer_media); if (last_answer && i < gst_sdp_message_medias_len (last_answer) && (rtp_trans = _find_transceiver (webrtc, mid, (FindTransceiverFunc) match_for_mid))) { const GstSDPMedia *last_media = gst_sdp_message_get_media (last_answer, i); const gchar *last_mid = gst_sdp_media_get_attribute_val (last_media, "mid"); /* FIXME: assumes no shenanigans with recycling transceivers */ g_assert (g_strcmp0 (mid, last_mid) == 0); if (!answer_caps && (rtp_trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV || rtp_trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY)) answer_caps = _find_codec_preferences (webrtc, rtp_trans, GST_PAD_SINK, i); if (!answer_caps && (rtp_trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV || rtp_trans->direction == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY)) answer_caps = _find_codec_preferences (webrtc, rtp_trans, GST_PAD_SRC, i); if (!answer_caps) answer_caps = _rtp_caps_from_media (last_media); /* XXX: In theory we're meant to use the sendrecv formats for the * inactive direction however we don't know what that may be and would * require asking outside what it expects to possibly send later */ GST_LOG_OBJECT (webrtc, "Found existing previously negotiated " "transceiver %" GST_PTR_FORMAT " from mid %s for mline %u " "using caps %" GST_PTR_FORMAT, rtp_trans, mid, i, answer_caps); } else { for (j = 0; j < webrtc->priv->transceivers->len; j++) { GstCaps *trans_caps; rtp_trans = g_ptr_array_index (webrtc->priv->transceivers, j); if (g_list_find (seen_transceivers, rtp_trans)) { /* Don't double allocate a transceiver to multiple mlines */ rtp_trans = NULL; continue; } trans_caps = _find_codec_preferences (webrtc, rtp_trans, GST_PAD_SINK, j); GST_TRACE_OBJECT (webrtc, "trying to compare %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT, offer_caps, trans_caps); /* FIXME: technically this is a little overreaching as some fields we * we can deal with not having and/or we may have unrecognized fields * that we cannot actually support */ if (trans_caps) { answer_caps = gst_caps_intersect (offer_caps, trans_caps); if (answer_caps && !gst_caps_is_empty (answer_caps)) { GST_LOG_OBJECT (webrtc, "found compatible transceiver %" GST_PTR_FORMAT " for offer media %u", rtp_trans, i); if (trans_caps) gst_caps_unref (trans_caps); break; } else { if (answer_caps) { gst_caps_unref (answer_caps); answer_caps = NULL; } if (trans_caps) gst_caps_unref (trans_caps); rtp_trans = NULL; } } else { rtp_trans = NULL; } } } if (rtp_trans) { answer_dir = rtp_trans->direction; g_assert (answer_caps != NULL); } else { /* if no transceiver, then we only receive that stream and respond with * the exact same caps */ /* FIXME: how to validate that subsequent elements can actually receive * this payload/format */ answer_dir = GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY; answer_caps = gst_caps_ref (offer_caps); } if (gst_caps_is_empty (answer_caps)) { GST_WARNING_OBJECT (webrtc, "Could not create caps for media"); if (rtp_trans) gst_object_unref (rtp_trans); gst_caps_unref (answer_caps); goto rejected; } seen_transceivers = g_list_prepend (seen_transceivers, rtp_trans); if (!rtp_trans) { trans = _create_webrtc_transceiver (webrtc, answer_dir, i); rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans); GST_LOG_OBJECT (webrtc, "Created new transceiver %" GST_PTR_FORMAT " for mline %u", trans, i); } else { trans = WEBRTC_TRANSCEIVER (rtp_trans); } if (!trans->do_nack) { answer_caps = gst_caps_make_writable (answer_caps); for (k = 0; k < gst_caps_get_size (answer_caps); k++) { GstStructure *s = gst_caps_get_structure (answer_caps, k); gst_structure_remove_fields (s, "rtcp-fb-nack", NULL); } } gst_sdp_media_set_media_from_caps (answer_caps, media); _get_rtx_target_pt_and_ssrc_from_caps (answer_caps, &target_pt, &target_ssrc); original_target_pt = target_pt; _media_add_fec (media, trans, offer_caps, &target_pt); if (trans->do_nack) { _media_add_rtx (media, trans, offer_caps, target_pt, target_ssrc); if (target_pt != original_target_pt) _media_add_rtx (media, trans, offer_caps, original_target_pt, target_ssrc); } if (answer_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY) _media_add_ssrcs (media, answer_caps, webrtc, WEBRTC_TRANSCEIVER (rtp_trans)); gst_caps_unref (answer_caps); answer_caps = NULL; /* set the new media direction */ offer_dir = _get_direction_from_media (offer_media); answer_dir = _intersect_answer_directions (offer_dir, answer_dir); if (answer_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE) { GST_WARNING_OBJECT (webrtc, "Could not intersect offer direction with " "transceiver direction"); goto rejected; } _media_replace_direction (media, answer_dir); if (!trans->stream) { TransportStream *item; item = _get_or_create_transport_stream (webrtc, bundled_mids ? bundle_idx : i, FALSE); webrtc_transceiver_set_transport (trans, item); } if (bundled_mids) { const gchar *mid = gst_sdp_media_get_attribute_val (media, "mid"); g_assert (mid); g_string_append_printf (bundled_mids, " %s", mid); } /* set the a=fingerprint: for this transport */ _add_fingerprint_to_media (trans->stream->transport, media); gst_caps_unref (offer_caps); } else { GST_WARNING_OBJECT (webrtc, "unknown m= line media name"); goto rejected; } if (0) { rejected: GST_INFO_OBJECT (webrtc, "media %u rejected", i); gst_sdp_media_free (media); gst_sdp_media_copy (offer_media, &media); gst_sdp_media_set_port_info (media, 0, 0); } gst_sdp_message_add_media (ret, media); gst_sdp_media_free (media); } if (bundled_mids) { gchar *mids = g_string_free (bundled_mids, FALSE); gst_sdp_message_add_attribute (ret, "group", mids); g_free (mids); } if (bundle_ufrag) g_free (bundle_ufrag); if (bundle_pwd) g_free (bundle_pwd); /* FIXME: can we add not matched transceivers? */ /* XXX: only true for the initial offerer */ g_object_set (webrtc->priv->ice, "controller", FALSE, NULL); out: g_strfreev (bundled); g_list_free (seen_transceivers); if (webrtc->priv->last_generated_offer) gst_webrtc_session_description_free (webrtc->priv->last_generated_offer); webrtc->priv->last_generated_offer = NULL; if (webrtc->priv->last_generated_answer) gst_webrtc_session_description_free (webrtc->priv->last_generated_answer); { GstSDPMessage *copy; gst_sdp_message_copy (ret, ©); webrtc->priv->last_generated_answer = gst_webrtc_session_description_new (GST_WEBRTC_SDP_TYPE_ANSWER, copy); } return ret; } struct create_sdp { GstStructure *options; GstPromise *promise; GstWebRTCSDPType type; }; static void _create_sdp_task (GstWebRTCBin * webrtc, struct create_sdp *data) { GstWebRTCSessionDescription *desc = NULL; GstSDPMessage *sdp = NULL; GstStructure *s = NULL; GST_INFO_OBJECT (webrtc, "creating %s sdp with options %" GST_PTR_FORMAT, gst_webrtc_sdp_type_to_string (data->type), data->options); if (data->type == GST_WEBRTC_SDP_TYPE_OFFER) sdp = _create_offer_task (webrtc, data->options); else if (data->type == GST_WEBRTC_SDP_TYPE_ANSWER) sdp = _create_answer_task (webrtc, data->options); else { g_assert_not_reached (); goto out; } if (sdp) { desc = gst_webrtc_session_description_new (data->type, sdp); s = gst_structure_new ("application/x-gst-promise", gst_webrtc_sdp_type_to_string (data->type), GST_TYPE_WEBRTC_SESSION_DESCRIPTION, desc, NULL); } out: PC_UNLOCK (webrtc); gst_promise_reply (data->promise, s); PC_LOCK (webrtc); if (desc) gst_webrtc_session_description_free (desc); } static void _free_create_sdp_data (struct create_sdp *data) { if (data->options) gst_structure_free (data->options); gst_promise_unref (data->promise); g_free (data); } static void gst_webrtc_bin_create_offer (GstWebRTCBin * webrtc, const GstStructure * options, GstPromise * promise) { struct create_sdp *data = g_new0 (struct create_sdp, 1); if (options) data->options = gst_structure_copy (options); data->promise = gst_promise_ref (promise); data->type = GST_WEBRTC_SDP_TYPE_OFFER; gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _create_sdp_task, data, (GDestroyNotify) _free_create_sdp_data); } static void gst_webrtc_bin_create_answer (GstWebRTCBin * webrtc, const GstStructure * options, GstPromise * promise) { struct create_sdp *data = g_new0 (struct create_sdp, 1); if (options) data->options = gst_structure_copy (options); data->promise = gst_promise_ref (promise); data->type = GST_WEBRTC_SDP_TYPE_ANSWER; gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _create_sdp_task, data, (GDestroyNotify) _free_create_sdp_data); } static GstWebRTCBinPad * _create_pad_for_sdp_media (GstWebRTCBin * webrtc, GstPadDirection direction, guint media_idx) { GstWebRTCBinPad *pad; gchar *pad_name; pad_name = g_strdup_printf ("%s_%u", direction == GST_PAD_SRC ? "src" : "sink", media_idx); pad = gst_webrtc_bin_pad_new (pad_name, direction); g_free (pad_name); pad->mlineindex = media_idx; return pad; } static GstWebRTCRTPTransceiver * _find_transceiver_for_sdp_media (GstWebRTCBin * webrtc, const GstSDPMessage * sdp, guint media_idx) { const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx); GstWebRTCRTPTransceiver *ret = NULL; int i; for (i = 0; i < gst_sdp_media_attributes_len (media); i++) { const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, i); if (g_strcmp0 (attr->key, "mid") == 0) { if ((ret = _find_transceiver (webrtc, attr->value, (FindTransceiverFunc) match_for_mid))) goto out; } } ret = _find_transceiver (webrtc, &media_idx, (FindTransceiverFunc) transceiver_match_for_mline); out: GST_TRACE_OBJECT (webrtc, "Found transceiver %" GST_PTR_FORMAT, ret); return ret; } static GstPad * _connect_input_stream (GstWebRTCBin * webrtc, GstWebRTCBinPad * pad) { /* * Not-bundle case: * * ,-------------------------webrtcbin-------------------------, * ; ; * ; ,-------rtpbin-------, ,--transport_send_%u--, ; * ; ; send_rtp_src_%u o---o rtp_sink ; ; * ; ; ; ; ; ; * ; ; send_rtcp_src_%u o---o rtcp_sink ; ; * ; sink_%u ; ; '---------------------' ; * o----------o send_rtp_sink_%u ; ; * ; '--------------------' ; * '--------------------- -------------------------------------' */ /* * Bundle case: * ,--------------------------------webrtcbin--------------------------------, * ; ; * ; ,-------rtpbin-------, ,--transport_send_%u--, ; * ; ; send_rtp_src_%u o---o rtp_sink ; ; * ; ; ; ; ; ; * ; ; send_rtcp_src_%u o---o rtcp_sink ; ; * ; sink_%u ,---funnel---, ; ; '---------------------' ; * o---------o sink_%u ; ; ; ; * ; sink_%u ; src o-o send_rtp_sink_%u ; ; * o---------o sink_%u ; ; ; ; * ; '------------' '--------------------' ; * '-------------------------------------------------------------------------' */ GstPadTemplate *rtp_templ; GstPad *rtp_sink; gchar *pad_name; WebRTCTransceiver *trans; g_return_val_if_fail (pad->trans != NULL, NULL); GST_INFO_OBJECT (pad, "linking input stream %u", pad->mlineindex); trans = WEBRTC_TRANSCEIVER (pad->trans); g_assert (trans->stream); if (!webrtc->rtpfunnel) { rtp_templ = _find_pad_template (webrtc->rtpbin, GST_PAD_SINK, GST_PAD_REQUEST, "send_rtp_sink_%u"); g_assert (rtp_templ); pad_name = g_strdup_printf ("send_rtp_sink_%u", pad->mlineindex); rtp_sink = gst_element_request_pad (webrtc->rtpbin, rtp_templ, pad_name, NULL); g_free (pad_name); gst_ghost_pad_set_target (GST_GHOST_PAD (pad), rtp_sink); gst_object_unref (rtp_sink); pad_name = g_strdup_printf ("send_rtp_src_%u", pad->mlineindex); if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name, GST_ELEMENT (trans->stream->send_bin), "rtp_sink")) g_warn_if_reached (); g_free (pad_name); } else { gchar *pad_name = g_strdup_printf ("sink_%u", pad->mlineindex); GstPad *funnel_sinkpad = gst_element_get_request_pad (webrtc->rtpfunnel, pad_name); gst_ghost_pad_set_target (GST_GHOST_PAD (pad), funnel_sinkpad); g_free (pad_name); gst_object_unref (funnel_sinkpad); } gst_element_sync_state_with_parent (GST_ELEMENT (trans->stream->send_bin)); return GST_PAD (pad); } /* output pads are receiving elements */ static void _connect_output_stream (GstWebRTCBin * webrtc, TransportStream * stream, guint session_id) { /* * ,------------------------webrtcbin------------------------, * ; ,---------rtpbin---------, ; * ; ,-transport_receive_%u--, ; ; ; * ; ; rtp_src o---o recv_rtp_sink_%u ; ; * ; ; ; ; ; ; * ; ; rtcp_src o---o recv_rtcp_sink_%u ; ; * ; '-----------------------' ; ; ; src_%u * ; ; recv_rtp_src_%u_%u_%u o--o * ; '------------------------' ; * '---------------------------------------------------------' */ gchar *pad_name; if (stream->output_connected) { GST_DEBUG_OBJECT (webrtc, "stream %" GST_PTR_FORMAT " is already " "connected to rtpbin. Not connecting", stream); return; } GST_INFO_OBJECT (webrtc, "linking output stream %u %" GST_PTR_FORMAT, session_id, stream); pad_name = g_strdup_printf ("recv_rtp_sink_%u", session_id); if (!gst_element_link_pads (GST_ELEMENT (stream->receive_bin), "rtp_src", GST_ELEMENT (webrtc->rtpbin), pad_name)) g_warn_if_reached (); g_free (pad_name); gst_element_sync_state_with_parent (GST_ELEMENT (stream->receive_bin)); /* The webrtcbin src_%u output pads will be created when rtpbin receives * data on that stream in on_rtpbin_pad_added() */ stream->output_connected = TRUE; } typedef struct { guint mlineindex; gchar *candidate; } IceCandidateItem; static void _clear_ice_candidate_item (IceCandidateItem * item) { g_free (item->candidate); } static void _add_ice_candidate (GstWebRTCBin * webrtc, IceCandidateItem * item, gboolean drop_invalid) { GstWebRTCICEStream *stream; stream = _find_ice_stream_for_session (webrtc, item->mlineindex); if (stream == NULL) { if (drop_invalid) { GST_WARNING_OBJECT (webrtc, "Unknown mline %u, dropping", item->mlineindex); } else { IceCandidateItem new; new.mlineindex = item->mlineindex; new.candidate = g_strdup (item->candidate); GST_INFO_OBJECT (webrtc, "Unknown mline %u, deferring", item->mlineindex); ICE_LOCK (webrtc); g_array_append_val (webrtc->priv->pending_remote_ice_candidates, new); ICE_UNLOCK (webrtc); } return; } GST_LOG_OBJECT (webrtc, "adding ICE candidate with mline:%u, %s", item->mlineindex, item->candidate); gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, item->candidate); } static void _add_ice_candidates_from_sdp (GstWebRTCBin * webrtc, gint mlineindex, const GstSDPMedia * media) { gint a; GstWebRTCICEStream *stream = NULL; for (a = 0; a < gst_sdp_media_attributes_len (media); a++) { const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, a); if (g_strcmp0 (attr->key, "candidate") == 0) { gchar *candidate; if (stream == NULL) stream = _find_ice_stream_for_session (webrtc, mlineindex); if (stream == NULL) { GST_WARNING_OBJECT (webrtc, "Unknown mline %u, dropping ICE candidates from SDP", mlineindex); return; } candidate = g_strdup_printf ("a=candidate:%s", attr->value); GST_LOG_OBJECT (webrtc, "adding ICE candidate with mline:%u, %s", mlineindex, candidate); gst_webrtc_ice_add_candidate (webrtc->priv->ice, stream, candidate); g_free (candidate); } } } static void _add_ice_candidate_to_sdp (GstWebRTCBin * webrtc, GstSDPMessage * sdp, gint mline_index, const gchar * candidate) { GstSDPMedia *media = NULL; if (mline_index < sdp->medias->len) { media = &g_array_index (sdp->medias, GstSDPMedia, mline_index); } if (media == NULL) { GST_WARNING_OBJECT (webrtc, "Couldn't find mline %d to merge ICE candidate", mline_index); return; } // Add the candidate as an attribute, first stripping off the existing // candidate: key from the string description if (strlen (candidate) < 10) { GST_WARNING_OBJECT (webrtc, "Dropping invalid ICE candidate for mline %d: %s", mline_index, candidate); return; } gst_sdp_media_add_attribute (media, "candidate", candidate + 10); } static gboolean _filter_sdp_fields (GQuark field_id, const GValue * value, GstStructure * new_structure) { if (!g_str_has_prefix (g_quark_to_string (field_id), "a-")) { gst_structure_id_set_value (new_structure, field_id, value); } return TRUE; } static void _set_rtx_ptmap_from_stream (GstWebRTCBin * webrtc, TransportStream * stream) { gint *rtx_pt; gsize rtx_count; rtx_pt = transport_stream_get_all_pt (stream, "RTX", &rtx_count); GST_LOG_OBJECT (stream, "have %" G_GSIZE_FORMAT " rtx payloads", rtx_count); if (rtx_pt) { GstStructure *pt_map = gst_structure_new_empty ("application/x-rtp-pt-map"); gsize i; for (i = 0; i < rtx_count; i++) { GstCaps *rtx_caps = transport_stream_get_caps_for_pt (stream, rtx_pt[i]); const GstStructure *s = gst_caps_get_structure (rtx_caps, 0); const gchar *apt = gst_structure_get_string (s, "apt"); GST_LOG_OBJECT (stream, "setting rtx mapping: %s -> %u", apt, rtx_pt[i]); gst_structure_set (pt_map, apt, G_TYPE_UINT, rtx_pt[i], NULL); } GST_DEBUG_OBJECT (stream, "setting payload map on %" GST_PTR_FORMAT " : %" GST_PTR_FORMAT " and %" GST_PTR_FORMAT, stream->rtxreceive, stream->rtxsend, pt_map); if (stream->rtxreceive) g_object_set (stream->rtxreceive, "payload-type-map", pt_map, NULL); if (stream->rtxsend) g_object_set (stream->rtxsend, "payload-type-map", pt_map, NULL); gst_structure_free (pt_map); } } static void _update_transport_ptmap_from_media (GstWebRTCBin * webrtc, TransportStream * stream, const GstSDPMessage * sdp, guint media_idx) { guint i, len; const gchar *proto; const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx); /* get proto */ proto = gst_sdp_media_get_proto (media); if (proto != NULL) { /* Parse global SDP attributes once */ GstCaps *global_caps = gst_caps_new_empty_simple ("application/x-unknown"); GST_DEBUG_OBJECT (webrtc, "mapping sdp session level attributes to caps"); gst_sdp_message_attributes_to_caps (sdp, global_caps); GST_DEBUG_OBJECT (webrtc, "mapping sdp media level attributes to caps"); gst_sdp_media_attributes_to_caps (media, global_caps); len = gst_sdp_media_formats_len (media); for (i = 0; i < len; i++) { GstCaps *caps, *outcaps; GstStructure *s; PtMapItem item; gint pt; guint j; pt = atoi (gst_sdp_media_get_format (media, i)); GST_DEBUG_OBJECT (webrtc, " looking at %d pt: %d", i, pt); /* convert caps */ caps = gst_sdp_media_get_caps_from_media (media, pt); if (caps == NULL) { GST_WARNING_OBJECT (webrtc, " skipping pt %d without caps", pt); continue; } /* Merge in global caps */ /* Intersect will merge in missing fields to the current caps */ outcaps = gst_caps_intersect (caps, global_caps); gst_caps_unref (caps); s = gst_caps_get_structure (outcaps, 0); gst_structure_set_name (s, "application/x-rtp"); if (!g_strcmp0 (gst_structure_get_string (s, "encoding-name"), "ULPFEC")) gst_structure_set (s, "is-fec", G_TYPE_BOOLEAN, TRUE, NULL); item.caps = gst_caps_new_empty (); for (j = 0; j < gst_caps_get_size (outcaps); j++) { GstStructure *s = gst_caps_get_structure (outcaps, j); GstStructure *filtered = gst_structure_new_empty (gst_structure_get_name (s)); gst_structure_foreach (s, (GstStructureForeachFunc) _filter_sdp_fields, filtered); gst_caps_append_structure (item.caps, filtered); } item.pt = pt; gst_caps_unref (outcaps); g_array_append_val (stream->ptmap, item); } gst_caps_unref (global_caps); } } static void _update_transceiver_from_sdp_media (GstWebRTCBin * webrtc, const GstSDPMessage * sdp, guint media_idx, TransportStream * stream, GstWebRTCRTPTransceiver * rtp_trans, GStrv bundled, guint bundle_idx) { WebRTCTransceiver *trans = WEBRTC_TRANSCEIVER (rtp_trans); GstWebRTCRTPTransceiverDirection prev_dir = rtp_trans->current_direction; GstWebRTCRTPTransceiverDirection new_dir; const GstSDPMedia *media = gst_sdp_message_get_media (sdp, media_idx); GstWebRTCDTLSSetup new_setup; gboolean new_rtcp_mux, new_rtcp_rsize; ReceiveState receive_state = RECEIVE_STATE_UNSET; int i; rtp_trans->mline = media_idx; for (i = 0; i < gst_sdp_media_attributes_len (media); i++) { const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, i); if (g_strcmp0 (attr->key, "mid") == 0) { g_free (rtp_trans->mid); rtp_trans->mid = g_strdup (attr->value); } } { const GstSDPMedia *local_media, *remote_media; GstWebRTCRTPTransceiverDirection local_dir, remote_dir; GstWebRTCDTLSSetup local_setup, remote_setup; local_media = gst_sdp_message_get_media (webrtc->current_local_description->sdp, media_idx); remote_media = gst_sdp_message_get_media (webrtc->current_remote_description->sdp, media_idx); local_setup = _get_dtls_setup_from_media (local_media); remote_setup = _get_dtls_setup_from_media (remote_media); new_setup = _get_final_setup (local_setup, remote_setup); if (new_setup == GST_WEBRTC_DTLS_SETUP_NONE) return; local_dir = _get_direction_from_media (local_media); remote_dir = _get_direction_from_media (remote_media); new_dir = _get_final_direction (local_dir, remote_dir); if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE) return; if (prev_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE && new_dir != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE && prev_dir != new_dir) { GST_FIXME_OBJECT (webrtc, "implement transceiver direction changes"); return; } if (!bundled || bundle_idx == media_idx) { new_rtcp_mux = _media_has_attribute_key (local_media, "rtcp-mux") && _media_has_attribute_key (remote_media, "rtcp-mux"); new_rtcp_rsize = _media_has_attribute_key (local_media, "rtcp-rsize") && _media_has_attribute_key (remote_media, "rtcp-rsize"); { GObject *session; g_signal_emit_by_name (webrtc->rtpbin, "get-internal-session", media_idx, &session); if (session) { g_object_set (session, "rtcp-reduced-size", new_rtcp_rsize, NULL); g_object_unref (session); } } g_object_set (stream, "rtcp-mux", new_rtcp_mux, NULL); } } if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) { if (!bundled) { /* Not a bundled stream means this entire transport is inactive, * so set the receive state to BLOCK below */ stream->active = FALSE; receive_state = RECEIVE_STATE_BLOCK; } } else { /* If this transceiver is active for sending or receiving, * we still need receive at least RTCP, so need to unblock * the receive bin below. */ GST_LOG_OBJECT (webrtc, "marking stream %p as active", stream); receive_state = RECEIVE_STATE_PASS; stream->active = TRUE; } if (new_dir != prev_dir) { GST_DEBUG_OBJECT (webrtc, "transceiver direction change"); if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_INACTIVE) { GstWebRTCBinPad *pad; pad = _find_pad_for_mline (webrtc, GST_PAD_SRC, media_idx); if (pad) { GstPad *target = gst_ghost_pad_get_target (GST_GHOST_PAD (pad)); if (target) { GstPad *peer = gst_pad_get_peer (target); if (peer) { gst_pad_send_event (peer, gst_event_new_eos ()); gst_object_unref (peer); } gst_object_unref (target); } gst_object_unref (pad); } /* XXX: send eos event up the sink pad as well? */ } if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDONLY || new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV) { GstWebRTCBinPad *pad = _find_pad_for_mline (webrtc, GST_PAD_SINK, media_idx); if (pad) { GST_DEBUG_OBJECT (webrtc, "found existing send pad %" GST_PTR_FORMAT " for transceiver %" GST_PTR_FORMAT, pad, trans); g_assert (pad->trans == rtp_trans); g_assert (pad->mlineindex == media_idx); gst_object_unref (pad); } else { GST_DEBUG_OBJECT (webrtc, "creating new send pad for transceiver %" GST_PTR_FORMAT, trans); pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SINK, media_idx); pad->trans = gst_object_ref (rtp_trans); _connect_input_stream (webrtc, pad); _add_pad (webrtc, pad); } } if (new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_RECVONLY || new_dir == GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV) { GstWebRTCBinPad *pad = _find_pad_for_mline (webrtc, GST_PAD_SRC, media_idx); if (pad) { GST_DEBUG_OBJECT (webrtc, "found existing receive pad %" GST_PTR_FORMAT " for transceiver %" GST_PTR_FORMAT, pad, trans); g_assert (pad->trans == rtp_trans); g_assert (pad->mlineindex == media_idx); gst_object_unref (pad); } else { GST_DEBUG_OBJECT (webrtc, "creating new receive pad for transceiver %" GST_PTR_FORMAT, trans); pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SRC, media_idx); pad->trans = gst_object_ref (rtp_trans); if (!trans->stream) { TransportStream *item; item = _get_or_create_transport_stream (webrtc, bundled ? bundle_idx : media_idx, FALSE); webrtc_transceiver_set_transport (trans, item); } _connect_output_stream (webrtc, trans->stream, bundled ? bundle_idx : media_idx); /* delay adding the pad until rtpbin creates the recv output pad * to ghost to so queries/events travel through the pipeline correctly * as soon as the pad is added */ _add_pad_to_list (webrtc, pad); } } rtp_trans->mline = media_idx; rtp_trans->current_direction = new_dir; } if (!bundled || bundle_idx == media_idx) { if (stream->rtxsend || stream->rtxreceive) { _set_rtx_ptmap_from_stream (webrtc, stream); } g_object_set (stream, "dtls-client", new_setup == GST_WEBRTC_DTLS_SETUP_ACTIVE, NULL); } /* Must be after setting the "dtls-client" so that data is not pushed into * the dtlssrtp elements before the ssl direction has been set which will * throw SSL errors */ if (receive_state != RECEIVE_STATE_UNSET) transport_receive_bin_set_receive_state (stream->receive_bin, receive_state); } /* must be called with the pc lock held */ static gint _generate_data_channel_id (GstWebRTCBin * webrtc) { gboolean is_client; gint new_id = -1, max_channels = 0; if (webrtc->priv->sctp_transport) { g_object_get (webrtc->priv->sctp_transport, "max-channels", &max_channels, NULL); } if (max_channels <= 0) { max_channels = 65534; } g_object_get (webrtc->priv->sctp_transport->transport, "client", &is_client, NULL); /* TODO: a better search algorithm */ do { GstWebRTCDataChannel *channel; new_id++; if (new_id < 0 || new_id >= max_channels) { /* exhausted id space */ GST_WARNING_OBJECT (webrtc, "Could not find a suitable " "data channel id (max %i)", max_channels); return -1; } /* client must generate even ids, server must generate odd ids */ if (new_id % 2 == ! !is_client) continue; channel = _find_data_channel_for_id (webrtc, new_id); if (!channel) break; } while (TRUE); return new_id; } static void _update_data_channel_from_sdp_media (GstWebRTCBin * webrtc, const GstSDPMessage * sdp, guint media_idx, TransportStream * stream) { const GstSDPMedia *local_media, *remote_media; GstWebRTCDTLSSetup local_setup, remote_setup, new_setup; TransportReceiveBin *receive; int local_port, remote_port; guint64 local_max_size, remote_max_size, max_size; int i; local_media = gst_sdp_message_get_media (webrtc->current_local_description->sdp, media_idx); remote_media = gst_sdp_message_get_media (webrtc->current_remote_description->sdp, media_idx); local_setup = _get_dtls_setup_from_media (local_media); remote_setup = _get_dtls_setup_from_media (remote_media); new_setup = _get_final_setup (local_setup, remote_setup); if (new_setup == GST_WEBRTC_DTLS_SETUP_NONE) return; /* data channel is always rtcp-muxed to avoid generating ICE candidates * for RTCP */ g_object_set (stream, "rtcp-mux", TRUE, "dtls-client", new_setup == GST_WEBRTC_DTLS_SETUP_ACTIVE, NULL); local_port = _get_sctp_port_from_media (local_media); remote_port = _get_sctp_port_from_media (local_media); if (local_port == -1 || remote_port == -1) return; if (0 == (local_max_size = _get_sctp_max_message_size_from_media (local_media))) local_max_size = G_MAXUINT64; if (0 == (remote_max_size = _get_sctp_max_message_size_from_media (remote_media))) remote_max_size = G_MAXUINT64; max_size = MIN (local_max_size, remote_max_size); webrtc->priv->sctp_transport->max_message_size = max_size; { guint orig_local_port, orig_remote_port; /* XXX: sctpassociation warns if we are in the wrong state */ g_object_get (webrtc->priv->sctp_transport->sctpdec, "local-sctp-port", &orig_local_port, NULL); if (orig_local_port != local_port) g_object_set (webrtc->priv->sctp_transport->sctpdec, "local-sctp-port", local_port, NULL); g_object_get (webrtc->priv->sctp_transport->sctpenc, "remote-sctp-port", &orig_remote_port, NULL); if (orig_remote_port != remote_port) g_object_set (webrtc->priv->sctp_transport->sctpenc, "remote-sctp-port", remote_port, NULL); } for (i = 0; i < webrtc->priv->data_channels->len; i++) { GstWebRTCDataChannel *channel; channel = g_ptr_array_index (webrtc->priv->data_channels, i); if (channel->id == -1) channel->id = _generate_data_channel_id (webrtc); if (channel->id == -1) GST_ELEMENT_WARNING (webrtc, RESOURCE, NOT_FOUND, ("%s", "Failed to generate an identifier for a data channel"), NULL); if (webrtc->priv->sctp_transport->association_established && !channel->negotiated && !channel->opened) { gst_webrtc_data_channel_link_to_sctp (channel, webrtc->priv->sctp_transport); gst_webrtc_data_channel_start_negotiation (channel); } } receive = TRANSPORT_RECEIVE_BIN (stream->receive_bin); transport_receive_bin_set_receive_state (receive, RECEIVE_STATE_PASS); } static gboolean _find_compatible_unassociated_transceiver (GstWebRTCRTPTransceiver * p1, gconstpointer data) { if (p1->mid) return FALSE; if (p1->mline != -1) return FALSE; if (p1->stopped) return FALSE; return TRUE; } static void _connect_rtpfunnel (GstWebRTCBin * webrtc, guint session_id) { gchar *pad_name; GstPad *queue_srcpad; GstPad *rtp_sink; TransportStream *stream = _find_transport_for_session (webrtc, session_id); GstElement *queue; g_assert (stream); if (webrtc->rtpfunnel) goto done; webrtc->rtpfunnel = gst_element_factory_make ("rtpfunnel", NULL); gst_bin_add (GST_BIN (webrtc), webrtc->rtpfunnel); gst_element_sync_state_with_parent (webrtc->rtpfunnel); queue = gst_element_factory_make ("queue", NULL); gst_bin_add (GST_BIN (webrtc), queue); gst_element_sync_state_with_parent (queue); gst_element_link (webrtc->rtpfunnel, queue); queue_srcpad = gst_element_get_static_pad (queue, "src"); pad_name = g_strdup_printf ("send_rtp_sink_%d", session_id); rtp_sink = gst_element_get_request_pad (webrtc->rtpbin, pad_name); g_free (pad_name); gst_pad_link (queue_srcpad, rtp_sink); gst_object_unref (queue_srcpad); gst_object_unref (rtp_sink); pad_name = g_strdup_printf ("send_rtp_src_%d", session_id); if (!gst_element_link_pads (GST_ELEMENT (webrtc->rtpbin), pad_name, GST_ELEMENT (stream->send_bin), "rtp_sink")) g_warn_if_reached (); g_free (pad_name); done: return; } static gboolean _update_transceivers_from_sdp (GstWebRTCBin * webrtc, SDPSource source, GstWebRTCSessionDescription * sdp) { int i; gboolean ret = FALSE; GStrv bundled = NULL; guint bundle_idx = 0; TransportStream *bundle_stream = NULL; /* FIXME: With some peers, it's possible we could have * multiple bundles to deal with, although I've never seen one yet */ if (!_parse_bundle (sdp->sdp, &bundled)) goto done; if (bundled) { if (!_get_bundle_index (sdp->sdp, bundled, &bundle_idx)) { GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching", bundled[0]); goto done; } bundle_stream = _get_or_create_transport_stream (webrtc, bundle_idx, _message_media_is_datachannel (sdp->sdp, bundle_idx)); /* Mark the bundle stream as inactive to start. It will be set to TRUE * by any bundled mline that is active, and at the end we set the * receivebin to BLOCK if all mlines were inactive. */ bundle_stream->active = FALSE; g_array_set_size (bundle_stream->ptmap, 0); for (i = 0; i < gst_sdp_message_medias_len (sdp->sdp); i++) { /* When bundling, we need to do this up front, or else RTX * parameters aren't set up properly for the bundled streams */ _update_transport_ptmap_from_media (webrtc, bundle_stream, sdp->sdp, i); } _connect_rtpfunnel (webrtc, bundle_idx); } for (i = 0; i < gst_sdp_message_medias_len (sdp->sdp); i++) { const GstSDPMedia *media = gst_sdp_message_get_media (sdp->sdp, i); TransportStream *stream; GstWebRTCRTPTransceiver *trans; guint transport_idx; /* skip rejected media */ if (gst_sdp_media_get_port (media) == 0) continue; if (bundled) transport_idx = bundle_idx; else transport_idx = i; trans = _find_transceiver_for_sdp_media (webrtc, sdp->sdp, i); stream = _get_or_create_transport_stream (webrtc, transport_idx, _message_media_is_datachannel (sdp->sdp, transport_idx)); if (!bundled) { /* When bundling, these were all set up above, but when not * bundling we need to do it now */ g_array_set_size (stream->ptmap, 0); _update_transport_ptmap_from_media (webrtc, stream, sdp->sdp, i); } if (trans) webrtc_transceiver_set_transport ((WebRTCTransceiver *) trans, stream); if (source == SDP_LOCAL && sdp->type == GST_WEBRTC_SDP_TYPE_OFFER && !trans) { GST_ERROR ("State mismatch. Could not find local transceiver by mline."); goto done; } else { if (g_strcmp0 (gst_sdp_media_get_media (media), "audio") == 0 || g_strcmp0 (gst_sdp_media_get_media (media), "video") == 0) { /* No existing transceiver, find an unused one */ if (!trans) { trans = _find_transceiver (webrtc, NULL, (FindTransceiverFunc) _find_compatible_unassociated_transceiver); } /* Still no transceiver? Create one */ /* XXX: default to the advertised direction in the sdp for new * transceivers. The spec doesn't actually say what happens here, only * that calls to setDirection will change the value. Nothing about * a default value when the transceiver is created internally */ if (!trans) { trans = GST_WEBRTC_RTP_TRANSCEIVER (_create_webrtc_transceiver (webrtc, _get_direction_from_media (media), i)); } _update_transceiver_from_sdp_media (webrtc, sdp->sdp, i, stream, trans, bundled, bundle_idx); } else if (_message_media_is_datachannel (sdp->sdp, i)) { _update_data_channel_from_sdp_media (webrtc, sdp->sdp, i, stream); } else { GST_ERROR_OBJECT (webrtc, "Unknown media type in SDP at index %u", i); } } } if (bundle_stream && bundle_stream->active == FALSE) { /* No bundled mline marked the bundle as active, so block the receive bin, as * this bundle is completely inactive */ GST_LOG_OBJECT (webrtc, "All mlines in bundle %u are inactive. Blocking receiver", bundle_idx); transport_receive_bin_set_receive_state (bundle_stream->receive_bin, RECEIVE_STATE_BLOCK); } ret = TRUE; done: g_strfreev (bundled); return ret; } struct set_description { GstPromise *promise; SDPSource source; GstWebRTCSessionDescription *sdp; }; /* http://w3c.github.io/webrtc-pc/#set-description */ static void _set_description_task (GstWebRTCBin * webrtc, struct set_description *sd) { GstWebRTCSignalingState new_signaling_state = webrtc->signaling_state; gboolean signalling_state_changed = FALSE; GError *error = NULL; GStrv bundled = NULL; guint bundle_idx = 0; guint i; { gchar *state = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE, webrtc->signaling_state); gchar *type_str = _enum_value_to_string (GST_TYPE_WEBRTC_SDP_TYPE, sd->sdp->type); gchar *sdp_text = gst_sdp_message_as_text (sd->sdp->sdp); GST_INFO_OBJECT (webrtc, "Attempting to set %s %s in the %s state", _sdp_source_to_string (sd->source), type_str, state); GST_TRACE_OBJECT (webrtc, "SDP contents\n%s", sdp_text); g_free (sdp_text); g_free (state); g_free (type_str); } if (!validate_sdp (webrtc->signaling_state, sd->source, sd->sdp, &error)) { GST_ERROR_OBJECT (webrtc, "%s", error->message); g_clear_error (&error); goto out; } if (webrtc->priv->is_closed) { GST_WARNING_OBJECT (webrtc, "we are closed"); goto out; } if (!_parse_bundle (sd->sdp->sdp, &bundled)) goto out; if (bundled) { if (!_get_bundle_index (sd->sdp->sdp, bundled, &bundle_idx)) { GST_ERROR_OBJECT (webrtc, "Bundle tag is %s but no media found matching", bundled[0]); goto out; } } switch (sd->sdp->type) { case GST_WEBRTC_SDP_TYPE_OFFER:{ if (sd->source == SDP_LOCAL) { if (webrtc->pending_local_description) gst_webrtc_session_description_free (webrtc->pending_local_description); webrtc->pending_local_description = gst_webrtc_session_description_copy (sd->sdp); new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_LOCAL_OFFER; } else { if (webrtc->pending_remote_description) gst_webrtc_session_description_free (webrtc->pending_remote_description); webrtc->pending_remote_description = gst_webrtc_session_description_copy (sd->sdp); new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_REMOTE_OFFER; } break; } case GST_WEBRTC_SDP_TYPE_ANSWER:{ if (sd->source == SDP_LOCAL) { if (webrtc->current_local_description) gst_webrtc_session_description_free (webrtc->current_local_description); webrtc->current_local_description = gst_webrtc_session_description_copy (sd->sdp); if (webrtc->current_remote_description) gst_webrtc_session_description_free (webrtc->current_remote_description); webrtc->current_remote_description = webrtc->pending_remote_description; webrtc->pending_remote_description = NULL; } else { if (webrtc->current_remote_description) gst_webrtc_session_description_free (webrtc->current_remote_description); webrtc->current_remote_description = gst_webrtc_session_description_copy (sd->sdp); if (webrtc->current_local_description) gst_webrtc_session_description_free (webrtc->current_local_description); webrtc->current_local_description = webrtc->pending_local_description; webrtc->pending_local_description = NULL; } if (webrtc->pending_local_description) gst_webrtc_session_description_free (webrtc->pending_local_description); webrtc->pending_local_description = NULL; if (webrtc->pending_remote_description) gst_webrtc_session_description_free (webrtc->pending_remote_description); webrtc->pending_remote_description = NULL; new_signaling_state = GST_WEBRTC_SIGNALING_STATE_STABLE; break; } case GST_WEBRTC_SDP_TYPE_ROLLBACK:{ GST_FIXME_OBJECT (webrtc, "rollbacks are completely untested"); if (sd->source == SDP_LOCAL) { if (webrtc->pending_local_description) gst_webrtc_session_description_free (webrtc->pending_local_description); webrtc->pending_local_description = NULL; } else { if (webrtc->pending_remote_description) gst_webrtc_session_description_free (webrtc->pending_remote_description); webrtc->pending_remote_description = NULL; } new_signaling_state = GST_WEBRTC_SIGNALING_STATE_STABLE; break; } case GST_WEBRTC_SDP_TYPE_PRANSWER:{ GST_FIXME_OBJECT (webrtc, "pranswers are completely untested"); if (sd->source == SDP_LOCAL) { if (webrtc->pending_local_description) gst_webrtc_session_description_free (webrtc->pending_local_description); webrtc->pending_local_description = gst_webrtc_session_description_copy (sd->sdp); new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_LOCAL_PRANSWER; } else { if (webrtc->pending_remote_description) gst_webrtc_session_description_free (webrtc->pending_remote_description); webrtc->pending_remote_description = gst_webrtc_session_description_copy (sd->sdp); new_signaling_state = GST_WEBRTC_SIGNALING_STATE_HAVE_REMOTE_PRANSWER; } break; } } if (sd->sdp->type == GST_WEBRTC_SDP_TYPE_ROLLBACK) { /* FIXME: * If the mid value of an RTCRtpTransceiver was set to a non-null value * by the RTCSessionDescription that is being rolled back, set the mid * value of that transceiver to null, as described by [JSEP] * (section 4.1.7.2.). * If an RTCRtpTransceiver was created by applying the * RTCSessionDescription that is being rolled back, and a track has not * been attached to it via addTrack, remove that transceiver from * connection's set of transceivers, as described by [JSEP] * (section 4.1.7.2.). * Restore the value of connection's [[ sctpTransport]] internal slot * to its value at the last stable signaling state. */ } if (webrtc->signaling_state != new_signaling_state) { webrtc->signaling_state = new_signaling_state; signalling_state_changed = TRUE; } if (webrtc->signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) { GList *tmp; /* media modifications */ _update_transceivers_from_sdp (webrtc, sd->source, sd->sdp); for (tmp = webrtc->priv->pending_sink_transceivers; tmp; tmp = tmp->next) { GstWebRTCBinPad *pad = GST_WEBRTC_BIN_PAD (tmp->data); const GstSDPMedia *media; media = gst_sdp_message_get_media (sd->sdp->sdp, pad->mlineindex); /* skip rejected media */ /* FIXME: arrange for an appropriate flow return */ if (gst_sdp_media_get_port (media) == 0) continue; _connect_input_stream (webrtc, pad); gst_pad_remove_probe (GST_PAD (pad), pad->block_id); pad->block_id = 0; } g_list_free_full (webrtc->priv->pending_sink_transceivers, (GDestroyNotify) gst_object_unref); webrtc->priv->pending_sink_transceivers = NULL; } for (i = 0; i < gst_sdp_message_medias_len (sd->sdp->sdp); i++) { gchar *ufrag, *pwd; TransportStream *item; item = _get_or_create_transport_stream (webrtc, bundled ? bundle_idx : i, _message_media_is_datachannel (sd->sdp->sdp, bundled ? bundle_idx : i)); if (sd->source == SDP_REMOTE) { const GstSDPMedia *media = gst_sdp_message_get_media (sd->sdp->sdp, i); guint j; for (j = 0; j < gst_sdp_media_attributes_len (media); j++) { const GstSDPAttribute *attr = gst_sdp_media_get_attribute (media, j); if (g_strcmp0 (attr->key, "ssrc") == 0) { GStrv split = g_strsplit (attr->value, " ", 0); guint32 ssrc; if (split[0] && sscanf (split[0], "%u", &ssrc) && split[1] && g_str_has_prefix (split[1], "cname:")) { SsrcMapItem ssrc_item; ssrc_item.media_idx = i; ssrc_item.ssrc = ssrc; g_array_append_val (item->remote_ssrcmap, ssrc_item); } g_strfreev (split); } } } if (bundled && bundle_idx != i) continue; _get_ice_credentials_from_sdp_media (sd->sdp->sdp, i, &ufrag, &pwd); if (sd->source == SDP_LOCAL) gst_webrtc_ice_set_local_credentials (webrtc->priv->ice, item->stream, ufrag, pwd); else gst_webrtc_ice_set_remote_credentials (webrtc->priv->ice, item->stream, ufrag, pwd); g_free (ufrag); g_free (pwd); } for (i = 0; i < webrtc->priv->ice_stream_map->len; i++) { IceStreamItem *item = &g_array_index (webrtc->priv->ice_stream_map, IceStreamItem, i); gst_webrtc_ice_gather_candidates (webrtc->priv->ice, item->stream); } /* Add any pending trickle ICE candidates if we have both offer and answer */ if (webrtc->current_local_description && webrtc->current_remote_description) { int i; GstWebRTCSessionDescription *remote_sdp = webrtc->current_remote_description; /* Add any remote ICE candidates from the remote description to * support non-trickle peers first */ for (i = 0; i < gst_sdp_message_medias_len (remote_sdp->sdp); i++) { const GstSDPMedia *media = gst_sdp_message_get_media (remote_sdp->sdp, i); _add_ice_candidates_from_sdp (webrtc, i, media); } ICE_LOCK (webrtc); for (i = 0; i < webrtc->priv->pending_remote_ice_candidates->len; i++) { IceCandidateItem *item = &g_array_index (webrtc->priv->pending_remote_ice_candidates, IceCandidateItem, i); _add_ice_candidate (webrtc, item, TRUE); } g_array_set_size (webrtc->priv->pending_remote_ice_candidates, 0); ICE_UNLOCK (webrtc); } /* * If connection's signaling state changed above, fire an event named * signalingstatechange at connection. */ if (signalling_state_changed) { gchar *from = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE, webrtc->signaling_state); gchar *to = _enum_value_to_string (GST_TYPE_WEBRTC_SIGNALING_STATE, new_signaling_state); GST_TRACE_OBJECT (webrtc, "notify signaling-state from %s " "to %s", from, to); PC_UNLOCK (webrtc); g_object_notify (G_OBJECT (webrtc), "signaling-state"); PC_LOCK (webrtc); g_free (from); g_free (to); } if (webrtc->signaling_state == GST_WEBRTC_SIGNALING_STATE_STABLE) { gboolean prev_need_negotiation = webrtc->priv->need_negotiation; /* If connection's signaling state is now stable, update the * negotiation-needed flag. If connection's [[ needNegotiation]] slot * was true both before and after this update, queue a task to check * connection's [[needNegotiation]] slot and, if still true, fire a * simple event named negotiationneeded at connection.*/ _update_need_negotiation (webrtc); if (prev_need_negotiation && webrtc->priv->need_negotiation) { _check_need_negotiation_task (webrtc, NULL); } } out: g_strfreev (bundled); PC_UNLOCK (webrtc); gst_promise_reply (sd->promise, NULL); PC_LOCK (webrtc); } static void _free_set_description_data (struct set_description *sd) { if (sd->promise) gst_promise_unref (sd->promise); if (sd->sdp) gst_webrtc_session_description_free (sd->sdp); g_free (sd); } static void gst_webrtc_bin_set_remote_description (GstWebRTCBin * webrtc, GstWebRTCSessionDescription * remote_sdp, GstPromise * promise) { struct set_description *sd; if (remote_sdp == NULL) goto bad_input; if (remote_sdp->sdp == NULL) goto bad_input; sd = g_new0 (struct set_description, 1); if (promise != NULL) sd->promise = gst_promise_ref (promise); sd->source = SDP_REMOTE; sd->sdp = gst_webrtc_session_description_copy (remote_sdp); gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _set_description_task, sd, (GDestroyNotify) _free_set_description_data); return; bad_input: { gst_promise_reply (promise, NULL); g_return_if_reached (); } } static void gst_webrtc_bin_set_local_description (GstWebRTCBin * webrtc, GstWebRTCSessionDescription * local_sdp, GstPromise * promise) { struct set_description *sd; if (local_sdp == NULL) goto bad_input; if (local_sdp->sdp == NULL) goto bad_input; sd = g_new0 (struct set_description, 1); if (promise != NULL) sd->promise = gst_promise_ref (promise); sd->source = SDP_LOCAL; sd->sdp = gst_webrtc_session_description_copy (local_sdp); gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _set_description_task, sd, (GDestroyNotify) _free_set_description_data); return; bad_input: { gst_promise_reply (promise, NULL); g_return_if_reached (); } } static void _add_ice_candidate_task (GstWebRTCBin * webrtc, IceCandidateItem * item) { if (!webrtc->current_local_description || !webrtc->current_remote_description) { IceCandidateItem new; new.mlineindex = item->mlineindex; new.candidate = g_steal_pointer (&item->candidate); ICE_LOCK (webrtc); g_array_append_val (webrtc->priv->pending_remote_ice_candidates, new); ICE_UNLOCK (webrtc); } else { _add_ice_candidate (webrtc, item, FALSE); } } static void _free_ice_candidate_item (IceCandidateItem * item) { _clear_ice_candidate_item (item); g_free (item); } static void gst_webrtc_bin_add_ice_candidate (GstWebRTCBin * webrtc, guint mline, const gchar * attr) { IceCandidateItem *item; item = g_new0 (IceCandidateItem, 1); item->mlineindex = mline; if (!g_ascii_strncasecmp (attr, "a=candidate:", 12)) item->candidate = g_strdup (attr); else if (!g_ascii_strncasecmp (attr, "candidate:", 10)) item->candidate = g_strdup_printf ("a=%s", attr); gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _add_ice_candidate_task, item, (GDestroyNotify) _free_ice_candidate_item); } static void _on_local_ice_candidate_task (GstWebRTCBin * webrtc) { gsize i; GArray *items; ICE_LOCK (webrtc); if (webrtc->priv->pending_local_ice_candidates->len == 0) { ICE_UNLOCK (webrtc); GST_LOG_OBJECT (webrtc, "No ICE candidates to process right now"); return; /* Nothing to process */ } /* Take the array so we can process it all and free it later * without holding the lock * FIXME: When we depend on GLib 2.64, we can use g_array_steal() * here */ items = webrtc->priv->pending_local_ice_candidates; /* Replace with a new array */ webrtc->priv->pending_local_ice_candidates = g_array_new (FALSE, TRUE, sizeof (IceCandidateItem)); g_array_set_clear_func (webrtc->priv->pending_local_ice_candidates, (GDestroyNotify) _clear_ice_candidate_item); ICE_UNLOCK (webrtc); for (i = 0; i < items->len; i++) { IceCandidateItem *item = &g_array_index (items, IceCandidateItem, i); const gchar *cand = item->candidate; if (!g_ascii_strncasecmp (cand, "a=candidate:", 12)) { /* stripping away "a=" */ cand += 2; } GST_TRACE_OBJECT (webrtc, "produced ICE candidate for mline:%u and %s", item->mlineindex, cand); /* First, merge this ice candidate into the appropriate mline * in the local-description SDP. * Second, emit the on-ice-candidate signal for the app. * * FIXME: This ICE candidate should be stored somewhere with * the associated mid and also merged back into any subsequent * local descriptions on renegotiation */ if (webrtc->current_local_description) _add_ice_candidate_to_sdp (webrtc, webrtc->current_local_description->sdp, item->mlineindex, cand); if (webrtc->pending_local_description) _add_ice_candidate_to_sdp (webrtc, webrtc->pending_local_description->sdp, item->mlineindex, cand); PC_UNLOCK (webrtc); g_signal_emit (webrtc, gst_webrtc_bin_signals[ON_ICE_CANDIDATE_SIGNAL], 0, item->mlineindex, cand); PC_LOCK (webrtc); } g_array_free (items, TRUE); } static void _on_local_ice_candidate_cb (GstWebRTCICE * ice, guint session_id, gchar * candidate, GstWebRTCBin * webrtc) { IceCandidateItem item; gboolean queue_task = FALSE; item.mlineindex = session_id; item.candidate = g_strdup (candidate); ICE_LOCK (webrtc); g_array_append_val (webrtc->priv->pending_local_ice_candidates, item); /* Let the first pending candidate queue a task each time, which will * handle any that arrive between now and when the task runs */ if (webrtc->priv->pending_local_ice_candidates->len == 1) queue_task = TRUE; ICE_UNLOCK (webrtc); if (queue_task) { GST_TRACE_OBJECT (webrtc, "Queueing on_ice_candidate_task"); gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _on_local_ice_candidate_task, NULL, NULL); } } /* https://www.w3.org/TR/webrtc/#dfn-stats-selection-algorithm */ static GstStructure * _get_stats_from_selector (GstWebRTCBin * webrtc, gpointer selector) { if (selector) GST_FIXME_OBJECT (webrtc, "Implement stats selection"); return gst_structure_copy (webrtc->priv->stats); } struct get_stats { GstPad *pad; GstPromise *promise; }; static void _free_get_stats (struct get_stats *stats) { if (stats->pad) gst_object_unref (stats->pad); if (stats->promise) gst_promise_unref (stats->promise); g_free (stats); } /* https://www.w3.org/TR/webrtc/#dom-rtcpeerconnection-getstats() */ static void _get_stats_task (GstWebRTCBin * webrtc, struct get_stats *stats) { GstStructure *s; gpointer selector = NULL; gst_webrtc_bin_update_stats (webrtc); if (stats->pad) { GstWebRTCBinPad *wpad = GST_WEBRTC_BIN_PAD (stats->pad); if (wpad->trans) { if (GST_PAD_DIRECTION (wpad) == GST_PAD_SRC) { selector = wpad->trans->receiver; } else { selector = wpad->trans->sender; } } } s = _get_stats_from_selector (webrtc, selector); gst_promise_reply (stats->promise, s); } static void gst_webrtc_bin_get_stats (GstWebRTCBin * webrtc, GstPad * pad, GstPromise * promise) { struct get_stats *stats; g_return_if_fail (promise != NULL); g_return_if_fail (pad == NULL || GST_IS_WEBRTC_BIN_PAD (pad)); stats = g_new0 (struct get_stats, 1); stats->promise = gst_promise_ref (promise); /* FIXME: check that pad exists in element */ if (pad) stats->pad = gst_object_ref (pad); gst_webrtc_bin_enqueue_task (webrtc, (GstWebRTCBinFunc) _get_stats_task, stats, (GDestroyNotify) _free_get_stats); } static GstWebRTCRTPTransceiver * gst_webrtc_bin_add_transceiver (GstWebRTCBin * webrtc, GstWebRTCRTPTransceiverDirection direction, GstCaps * caps) { WebRTCTransceiver *trans; GstWebRTCRTPTransceiver *rtp_trans; g_return_val_if_fail (direction != GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_NONE, NULL); trans = _create_webrtc_transceiver (webrtc, direction, -1); GST_LOG_OBJECT (webrtc, "Created new unassociated transceiver %" GST_PTR_FORMAT, trans); rtp_trans = GST_WEBRTC_RTP_TRANSCEIVER (trans); if (caps) rtp_trans->codec_preferences = gst_caps_ref (caps); return gst_object_ref (trans); } static void _deref_and_unref (GstObject ** object) { gst_clear_object (object); } static GArray * gst_webrtc_bin_get_transceivers (GstWebRTCBin * webrtc) { GArray *arr = g_array_new (FALSE, TRUE, sizeof (GstWebRTCRTPTransceiver *)); int i; g_array_set_clear_func (arr, (GDestroyNotify) _deref_and_unref); for (i = 0; i < webrtc->priv->transceivers->len; i++) { GstWebRTCRTPTransceiver *trans = g_ptr_array_index (webrtc->priv->transceivers, i); gst_object_ref (trans); g_array_append_val (arr, trans); } return arr; } static GstWebRTCRTPTransceiver * gst_webrtc_bin_get_transceiver (GstWebRTCBin * webrtc, guint idx) { GstWebRTCRTPTransceiver *trans = NULL; if (idx >= webrtc->priv->transceivers->len) { GST_ERROR_OBJECT (webrtc, "No transceiver for idx %d", idx); goto done; } trans = g_ptr_array_index (webrtc->priv->transceivers, idx); gst_object_ref (trans); done: return trans; } static gboolean gst_webrtc_bin_add_turn_server (GstWebRTCBin * webrtc, const gchar * uri) { g_return_val_if_fail (GST_IS_WEBRTC_BIN (webrtc), FALSE); g_return_val_if_fail (uri != NULL, FALSE); GST_DEBUG_OBJECT (webrtc, "Adding turn server: %s", uri); return gst_webrtc_ice_add_turn_server (webrtc->priv->ice, uri); } static gboolean copy_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data) { GstPad *gpad = GST_PAD_CAST (user_data); GST_DEBUG_OBJECT (gpad, "store sticky event %" GST_PTR_FORMAT, *event); gst_pad_store_sticky_event (gpad, *event); return TRUE; } static GstWebRTCDataChannel * gst_webrtc_bin_create_data_channel (GstWebRTCBin * webrtc, const gchar * label, GstStructure * init_params) { gboolean ordered; gint max_packet_lifetime; gint max_retransmits; const gchar *protocol; gboolean negotiated; gint id; GstWebRTCPriorityType priority; GstWebRTCDataChannel *ret; gint max_channels = 65534; g_return_val_if_fail (GST_IS_WEBRTC_BIN (webrtc), NULL); g_return_val_if_fail (label != NULL, NULL); g_return_val_if_fail (strlen (label) <= 65535, NULL); g_return_val_if_fail (webrtc->priv->is_closed != TRUE, NULL); if (!init_params || !gst_structure_get_boolean (init_params, "ordered", &ordered)) ordered = TRUE; if (!init_params || !gst_structure_get_int (init_params, "max-packet-lifetime", &max_packet_lifetime)) max_packet_lifetime = -1; if (!init_params || !gst_structure_get_int (init_params, "max-retransmits", &max_retransmits)) max_retransmits = -1; /* both retransmits and lifetime cannot be set */ g_return_val_if_fail ((max_packet_lifetime == -1) || (max_retransmits == -1), NULL); if (!init_params || !(protocol = gst_structure_get_string (init_params, "protocol"))) protocol = ""; g_return_val_if_fail (strlen (protocol) <= 65535, NULL); if (!init_params || !gst_structure_get_boolean (init_params, "negotiated", &negotiated)) negotiated = FALSE; if (!negotiated || !init_params || !gst_structure_get_int (init_params, "id", &id)) id = -1; if (negotiated) g_return_val_if_fail (id != -1, NULL); g_return_val_if_fail (id < 65535, NULL); if (!init_params || !gst_structure_get_enum (init_params, "priority", GST_TYPE_WEBRTC_PRIORITY_TYPE, (gint *) & priority)) priority = GST_WEBRTC_PRIORITY_TYPE_LOW; /* FIXME: clamp max-retransmits and max-packet-lifetime */ if (webrtc->priv->sctp_transport) { /* Let transport be the connection's [[SctpTransport]] slot. * * If the [[DataChannelId]] slot is not null, transport is in * connected state and [[DataChannelId]] is greater or equal to the * transport's [[MaxChannels]] slot, throw an OperationError. */ g_object_get (webrtc->priv->sctp_transport, "max-channels", &max_channels, NULL); g_return_val_if_fail (id <= max_channels, NULL); } if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc) || !_have_sctp_elements (webrtc)) return NULL; PC_LOCK (webrtc); /* check if the id has been used already */ if (id != -1) { GstWebRTCDataChannel *channel = _find_data_channel_for_id (webrtc, id); if (channel) { GST_ELEMENT_WARNING (webrtc, LIBRARY, SETTINGS, ("Attempting to add a data channel with a duplicate ID: %i", id), NULL); PC_UNLOCK (webrtc); return NULL; } } else if (webrtc->current_local_description && webrtc->current_remote_description && webrtc->priv->sctp_transport && webrtc->priv->sctp_transport->transport) { /* else we can only generate an id if we're configured already. The other * case for generating an id is on sdp setting */ id = _generate_data_channel_id (webrtc); if (id == -1) { GST_ELEMENT_WARNING (webrtc, RESOURCE, NOT_FOUND, ("%s", "Failed to generate an identifier for a data channel"), NULL); PC_UNLOCK (webrtc); return NULL; } } ret = g_object_new (GST_TYPE_WEBRTC_DATA_CHANNEL, "label", label, "ordered", ordered, "max-packet-lifetime", max_packet_lifetime, "max-retransmits", max_retransmits, "protocol", protocol, "negotiated", negotiated, "id", id, "priority", priority, NULL); if (ret) { gst_bin_add (GST_BIN (webrtc), ret->appsrc); gst_bin_add (GST_BIN (webrtc), ret->appsink); gst_element_sync_state_with_parent (ret->appsrc); gst_element_sync_state_with_parent (ret->appsink); ret = gst_object_ref (ret); ret->webrtcbin = webrtc; g_ptr_array_add (webrtc->priv->data_channels, ret); gst_webrtc_data_channel_link_to_sctp (ret, webrtc->priv->sctp_transport); if (webrtc->priv->sctp_transport && webrtc->priv->sctp_transport->association_established && !ret->negotiated) { gst_webrtc_data_channel_start_negotiation (ret); } else { _update_need_negotiation (webrtc); } } PC_UNLOCK (webrtc); return ret; } /* === rtpbin signal implementations === */ static void on_rtpbin_pad_added (GstElement * rtpbin, GstPad * new_pad, GstWebRTCBin * webrtc) { gchar *new_pad_name = NULL; new_pad_name = gst_pad_get_name (new_pad); GST_TRACE_OBJECT (webrtc, "new rtpbin pad %s", new_pad_name); if (g_str_has_prefix (new_pad_name, "recv_rtp_src_")) { guint32 session_id = 0, ssrc = 0, pt = 0; GstWebRTCRTPTransceiver *rtp_trans; WebRTCTransceiver *trans; TransportStream *stream; GstWebRTCBinPad *pad; guint media_idx = 0; gboolean found_ssrc = FALSE; guint i; if (sscanf (new_pad_name, "recv_rtp_src_%u_%u_%u", &session_id, &ssrc, &pt) != 3) { g_critical ("Invalid rtpbin pad name \'%s\'", new_pad_name); return; } stream = _find_transport_for_session (webrtc, session_id); if (!stream) g_warn_if_reached (); media_idx = session_id; for (i = 0; i < stream->remote_ssrcmap->len; i++) { SsrcMapItem *item = &g_array_index (stream->remote_ssrcmap, SsrcMapItem, i); if (item->ssrc == ssrc) { media_idx = item->media_idx; found_ssrc = TRUE; break; } } if (!found_ssrc) { GST_WARNING_OBJECT (webrtc, "Could not find ssrc %u", ssrc); } rtp_trans = _find_transceiver_for_mline (webrtc, media_idx); if (!rtp_trans) g_warn_if_reached (); trans = WEBRTC_TRANSCEIVER (rtp_trans); g_assert (trans->stream == stream); pad = _find_pad_for_transceiver (webrtc, GST_PAD_SRC, rtp_trans); GST_TRACE_OBJECT (webrtc, "found pad %" GST_PTR_FORMAT " for rtpbin pad name %s", pad, new_pad_name); if (!pad) g_warn_if_reached (); gst_ghost_pad_set_target (GST_GHOST_PAD (pad), GST_PAD (new_pad)); if (webrtc->priv->running) gst_pad_set_active (GST_PAD (pad), TRUE); gst_pad_sticky_events_foreach (new_pad, copy_sticky_events, pad); gst_element_add_pad (GST_ELEMENT (webrtc), GST_PAD (pad)); _remove_pending_pad (webrtc, pad); gst_object_unref (pad); } g_free (new_pad_name); } /* only used for the receiving streams */ static GstCaps * on_rtpbin_request_pt_map (GstElement * rtpbin, guint session_id, guint pt, GstWebRTCBin * webrtc) { TransportStream *stream; GstCaps *ret; GST_DEBUG_OBJECT (webrtc, "getting pt map for pt %d in session %d", pt, session_id); stream = _find_transport_for_session (webrtc, session_id); if (!stream) goto unknown_session; if ((ret = transport_stream_get_caps_for_pt (stream, pt))) gst_caps_ref (ret); GST_TRACE_OBJECT (webrtc, "Found caps %" GST_PTR_FORMAT " for pt %d in " "session %d", ret, pt, session_id); return ret; unknown_session: { GST_DEBUG_OBJECT (webrtc, "unknown session %d", session_id); return NULL; } } static GstElement * on_rtpbin_request_aux_sender (GstElement * rtpbin, guint session_id, GstWebRTCBin * webrtc) { TransportStream *stream; gboolean have_rtx = FALSE; GstStructure *pt_map = NULL; GstElement *ret = NULL; GstWebRTCRTPTransceiver *trans; stream = _find_transport_for_session (webrtc, session_id); trans = _find_transceiver (webrtc, &session_id, (FindTransceiverFunc) transceiver_match_for_mline); if (stream) have_rtx = transport_stream_get_pt (stream, "RTX") != 0; GST_LOG_OBJECT (webrtc, "requesting aux sender for stream %" GST_PTR_FORMAT " with transport %" GST_PTR_FORMAT " and pt map %" GST_PTR_FORMAT, stream, trans, pt_map); if (have_rtx) { GstElement *rtx; GstPad *pad; gchar *name; if (stream->rtxsend) { GST_WARNING_OBJECT (webrtc, "rtprtxsend already created! rtpbin bug?!"); goto out; } GST_INFO ("creating AUX sender"); ret = gst_bin_new (NULL); rtx = gst_element_factory_make ("rtprtxsend", NULL); g_object_set (rtx, "max-size-packets", 500, NULL); _set_rtx_ptmap_from_stream (webrtc, stream); if (WEBRTC_TRANSCEIVER (trans)->local_rtx_ssrc_map) g_object_set (rtx, "ssrc-map", WEBRTC_TRANSCEIVER (trans)->local_rtx_ssrc_map, NULL); gst_bin_add (GST_BIN (ret), rtx); pad = gst_element_get_static_pad (rtx, "src"); name = g_strdup_printf ("src_%u", session_id); gst_element_add_pad (ret, gst_ghost_pad_new (name, pad)); g_free (name); gst_object_unref (pad); pad = gst_element_get_static_pad (rtx, "sink"); name = g_strdup_printf ("sink_%u", session_id); gst_element_add_pad (ret, gst_ghost_pad_new (name, pad)); g_free (name); gst_object_unref (pad); stream->rtxsend = gst_object_ref (rtx); } out: if (pt_map) gst_structure_free (pt_map); return ret; } static GstElement * on_rtpbin_request_aux_receiver (GstElement * rtpbin, guint session_id, GstWebRTCBin * webrtc) { GstElement *ret = NULL; GstElement *prev = NULL; GstPad *sinkpad = NULL; TransportStream *stream; gint red_pt = 0; gint rtx_pt = 0; stream = _find_transport_for_session (webrtc, session_id); if (stream) { red_pt = transport_stream_get_pt (stream, "RED"); rtx_pt = transport_stream_get_pt (stream, "RTX"); } GST_LOG_OBJECT (webrtc, "requesting aux receiver for stream %" GST_PTR_FORMAT, stream); if (red_pt || rtx_pt) ret = gst_bin_new (NULL); if (rtx_pt) { if (stream->rtxreceive) { GST_WARNING_OBJECT (webrtc, "rtprtxreceive already created! rtpbin bug?!"); goto error; } stream->rtxreceive = gst_element_factory_make ("rtprtxreceive", NULL); _set_rtx_ptmap_from_stream (webrtc, stream); gst_bin_add (GST_BIN (ret), stream->rtxreceive); sinkpad = gst_element_get_static_pad (stream->rtxreceive, "sink"); prev = gst_object_ref (stream->rtxreceive); } if (red_pt) { GstElement *rtpreddec = gst_element_factory_make ("rtpreddec", NULL); GST_DEBUG_OBJECT (webrtc, "Creating RED decoder for pt %d in session %u", red_pt, session_id); gst_bin_add (GST_BIN (ret), rtpreddec); g_object_set (rtpreddec, "pt", red_pt, NULL); if (prev) gst_element_link (prev, rtpreddec); else sinkpad = gst_element_get_static_pad (rtpreddec, "sink"); prev = rtpreddec; } if (sinkpad) { gchar *name = g_strdup_printf ("sink_%u", session_id); GstPad *ghost = gst_ghost_pad_new (name, sinkpad); g_free (name); gst_object_unref (sinkpad); gst_element_add_pad (ret, ghost); } if (prev) { gchar *name = g_strdup_printf ("src_%u", session_id); GstPad *srcpad = gst_element_get_static_pad (prev, "src"); GstPad *ghost = gst_ghost_pad_new (name, srcpad); g_free (name); gst_object_unref (srcpad); gst_element_add_pad (ret, ghost); } out: return ret; error: if (ret) gst_object_unref (ret); goto out; } static GstElement * on_rtpbin_request_fec_decoder (GstElement * rtpbin, guint session_id, GstWebRTCBin * webrtc) { TransportStream *stream; GstElement *ret = NULL; gint pt = 0; GObject *internal_storage; stream = _find_transport_for_session (webrtc, session_id); /* TODO: for now, we only support ulpfec, but once we support * more algorithms, if the remote may use more than one algorithm, * we will want to do the following: * * + Return a bin here, with the relevant FEC decoders plugged in * and their payload type set to 0 * + Enable the decoders by setting the payload type only when * we detect it (by connecting to ptdemux:new-payload-type for * example) */ if (stream) pt = transport_stream_get_pt (stream, "ULPFEC"); if (pt) { GST_DEBUG_OBJECT (webrtc, "Creating ULPFEC decoder for pt %d in session %u", pt, session_id); ret = gst_element_factory_make ("rtpulpfecdec", NULL); g_signal_emit_by_name (webrtc->rtpbin, "get-internal-storage", session_id, &internal_storage); g_object_set (ret, "pt", pt, "storage", internal_storage, NULL); g_object_unref (internal_storage); } return ret; } static GstElement * on_rtpbin_request_fec_encoder (GstElement * rtpbin, guint session_id, GstWebRTCBin * webrtc) { GstElement *ret = NULL; GstElement *prev = NULL; TransportStream *stream; guint ulpfec_pt = 0; guint red_pt = 0; GstPad *sinkpad = NULL; GstWebRTCRTPTransceiver *trans; stream = _find_transport_for_session (webrtc, session_id); trans = _find_transceiver (webrtc, &session_id, (FindTransceiverFunc) transceiver_match_for_mline); if (stream) { ulpfec_pt = transport_stream_get_pt (stream, "ULPFEC"); red_pt = transport_stream_get_pt (stream, "RED"); } if (ulpfec_pt || red_pt) ret = gst_bin_new (NULL); if (ulpfec_pt) { GstElement *fecenc = gst_element_factory_make ("rtpulpfecenc", NULL); GstCaps *caps = transport_stream_get_caps_for_pt (stream, ulpfec_pt); GST_DEBUG_OBJECT (webrtc, "Creating ULPFEC encoder for session %d with pt %d", session_id, ulpfec_pt); gst_bin_add (GST_BIN (ret), fecenc); sinkpad = gst_element_get_static_pad (fecenc, "sink"); g_object_set (fecenc, "pt", ulpfec_pt, "percentage", WEBRTC_TRANSCEIVER (trans)->fec_percentage, NULL); if (caps && !gst_caps_is_empty (caps)) { const GstStructure *s = gst_caps_get_structure (caps, 0); const gchar *media = gst_structure_get_string (s, "media"); if (!g_strcmp0 (media, "video")) g_object_set (fecenc, "multipacket", TRUE, NULL); } prev = fecenc; } if (red_pt) { GstElement *redenc = gst_element_factory_make ("rtpredenc", NULL); GST_DEBUG_OBJECT (webrtc, "Creating RED encoder for session %d with pt %d", session_id, red_pt); gst_bin_add (GST_BIN (ret), redenc); if (prev) gst_element_link (prev, redenc); else sinkpad = gst_element_get_static_pad (redenc, "sink"); g_object_set (redenc, "pt", red_pt, "allow-no-red-blocks", TRUE, NULL); prev = redenc; } if (sinkpad) { GstPad *ghost = gst_ghost_pad_new ("sink", sinkpad); gst_object_unref (sinkpad); gst_element_add_pad (ret, ghost); } if (prev) { GstPad *srcpad = gst_element_get_static_pad (prev, "src"); GstPad *ghost = gst_ghost_pad_new ("src", srcpad); gst_object_unref (srcpad); gst_element_add_pad (ret, ghost); } return ret; } static void on_rtpbin_bye_ssrc (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u received bye", session_id, ssrc); } static void on_rtpbin_bye_timeout (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u bye timeout", session_id, ssrc); } static void on_rtpbin_sender_timeout (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u sender timeout", session_id, ssrc); } static void on_rtpbin_new_ssrc (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u new ssrc", session_id, ssrc); } static void on_rtpbin_ssrc_active (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u active", session_id, ssrc); } static void on_rtpbin_ssrc_collision (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u collision", session_id, ssrc); } static void on_rtpbin_ssrc_sdes (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u sdes", session_id, ssrc); } static void on_rtpbin_ssrc_validated (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u validated", session_id, ssrc); } static void on_rtpbin_timeout (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u timeout", session_id, ssrc); } static void on_rtpbin_new_sender_ssrc (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u new sender ssrc", session_id, ssrc); } static void on_rtpbin_sender_ssrc_active (GstElement * rtpbin, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GST_INFO_OBJECT (webrtc, "session %u ssrc %u sender ssrc active", session_id, ssrc); } static void on_rtpbin_new_jitterbuffer (GstElement * rtpbin, GstElement * jitterbuffer, guint session_id, guint ssrc, GstWebRTCBin * webrtc) { GstWebRTCRTPTransceiver *trans; trans = _find_transceiver (webrtc, &session_id, (FindTransceiverFunc) transceiver_match_for_mline); if (trans) { /* We don't set do-retransmission on rtpbin as we want per-session control */ g_object_set (jitterbuffer, "do-retransmission", WEBRTC_TRANSCEIVER (trans)->do_nack, NULL); } else { g_assert_not_reached (); } } static void on_rtpbin_new_storage (GstElement * rtpbin, GstElement * storage, guint session_id, GstWebRTCBin * webrtc) { /* TODO: when exposing latency, set size-time based on that */ g_object_set (storage, "size-time", (guint64) 250 * GST_MSECOND, NULL); } static GstElement * _create_rtpbin (GstWebRTCBin * webrtc) { GstElement *rtpbin; if (!(rtpbin = gst_element_factory_make ("rtpbin", "rtpbin"))) return NULL; /* mandated by WebRTC */ gst_util_set_object_arg (G_OBJECT (rtpbin), "rtp-profile", "savpf"); g_object_set (rtpbin, "do-lost", TRUE, NULL); g_signal_connect (rtpbin, "pad-added", G_CALLBACK (on_rtpbin_pad_added), webrtc); g_signal_connect (rtpbin, "request-pt-map", G_CALLBACK (on_rtpbin_request_pt_map), webrtc); g_signal_connect (rtpbin, "request-aux-sender", G_CALLBACK (on_rtpbin_request_aux_sender), webrtc); g_signal_connect (rtpbin, "request-aux-receiver", G_CALLBACK (on_rtpbin_request_aux_receiver), webrtc); g_signal_connect (rtpbin, "new-storage", G_CALLBACK (on_rtpbin_new_storage), webrtc); g_signal_connect (rtpbin, "request-fec-decoder", G_CALLBACK (on_rtpbin_request_fec_decoder), webrtc); g_signal_connect (rtpbin, "request-fec-encoder", G_CALLBACK (on_rtpbin_request_fec_encoder), webrtc); g_signal_connect (rtpbin, "on-bye-ssrc", G_CALLBACK (on_rtpbin_bye_ssrc), webrtc); g_signal_connect (rtpbin, "on-bye-timeout", G_CALLBACK (on_rtpbin_bye_timeout), webrtc); g_signal_connect (rtpbin, "on-new-ssrc", G_CALLBACK (on_rtpbin_new_ssrc), webrtc); g_signal_connect (rtpbin, "on-new-sender-ssrc", G_CALLBACK (on_rtpbin_new_sender_ssrc), webrtc); g_signal_connect (rtpbin, "on-sender-ssrc-active", G_CALLBACK (on_rtpbin_sender_ssrc_active), webrtc); g_signal_connect (rtpbin, "on-sender-timeout", G_CALLBACK (on_rtpbin_sender_timeout), webrtc); g_signal_connect (rtpbin, "on-ssrc-active", G_CALLBACK (on_rtpbin_ssrc_active), webrtc); g_signal_connect (rtpbin, "on-ssrc-collision", G_CALLBACK (on_rtpbin_ssrc_collision), webrtc); g_signal_connect (rtpbin, "on-ssrc-sdes", G_CALLBACK (on_rtpbin_ssrc_sdes), webrtc); g_signal_connect (rtpbin, "on-ssrc-validated", G_CALLBACK (on_rtpbin_ssrc_validated), webrtc); g_signal_connect (rtpbin, "on-timeout", G_CALLBACK (on_rtpbin_timeout), webrtc); g_signal_connect (rtpbin, "new-jitterbuffer", G_CALLBACK (on_rtpbin_new_jitterbuffer), webrtc); return rtpbin; } static GstStateChangeReturn gst_webrtc_bin_change_state (GstElement * element, GstStateChange transition) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element); GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; GST_DEBUG ("changing state: %s => %s", gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)), gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition))); switch (transition) { case GST_STATE_CHANGE_NULL_TO_READY:{ if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc)) return GST_STATE_CHANGE_FAILURE; _start_thread (webrtc); PC_LOCK (webrtc); _update_need_negotiation (webrtc); PC_UNLOCK (webrtc); break; } case GST_STATE_CHANGE_READY_TO_PAUSED: webrtc->priv->running = TRUE; break; default: break; } ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); if (ret == GST_STATE_CHANGE_FAILURE) return ret; switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* Mangle the return value to NO_PREROLL as that's what really is * occurring here however cannot be propagated correctly due to nicesrc * requiring that it be in PLAYING already in order to send/receive * correctly :/ */ ret = GST_STATE_CHANGE_NO_PREROLL; break; case GST_STATE_CHANGE_PAUSED_TO_READY: webrtc->priv->running = FALSE; break; case GST_STATE_CHANGE_READY_TO_NULL: _stop_thread (webrtc); break; default: break; } return ret; } static GstPadProbeReturn sink_pad_block (GstPad * pad, GstPadProbeInfo * info, gpointer unused) { GST_LOG_OBJECT (pad, "blocking pad with data %" GST_PTR_FORMAT, info->data); return GST_PAD_PROBE_OK; } static GstPad * gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ, const gchar * name, const GstCaps * caps) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element); GstWebRTCBinPad *pad = NULL; guint serial; if (!_have_nice_elements (webrtc) || !_have_dtls_elements (webrtc)) return NULL; if (templ->direction == GST_PAD_SINK || g_strcmp0 (templ->name_template, "sink_%u") == 0) { GstWebRTCRTPTransceiver *trans; GST_OBJECT_LOCK (webrtc); if (name == NULL || strlen (name) < 6 || !g_str_has_prefix (name, "sink_")) { /* no name given when requesting the pad, use next available int */ serial = webrtc->priv->max_sink_pad_serial++; } else { /* parse serial number from requested padname */ serial = g_ascii_strtoull (&name[5], NULL, 10); if (serial > webrtc->priv->max_sink_pad_serial) webrtc->priv->max_sink_pad_serial = serial; } GST_OBJECT_UNLOCK (webrtc); pad = _create_pad_for_sdp_media (webrtc, GST_PAD_SINK, serial); trans = _find_transceiver_for_mline (webrtc, serial); if (!trans) { trans = GST_WEBRTC_RTP_TRANSCEIVER (_create_webrtc_transceiver (webrtc, GST_WEBRTC_RTP_TRANSCEIVER_DIRECTION_SENDRECV, serial)); GST_LOG_OBJECT (webrtc, "Created new transceiver %" GST_PTR_FORMAT " for mline %u", trans, serial); } pad->trans = gst_object_ref (trans); pad->block_id = gst_pad_add_probe (GST_PAD (pad), GST_PAD_PROBE_TYPE_BLOCK | GST_PAD_PROBE_TYPE_BUFFER | GST_PAD_PROBE_TYPE_BUFFER_LIST, (GstPadProbeCallback) sink_pad_block, NULL, NULL); webrtc->priv->pending_sink_transceivers = g_list_append (webrtc->priv->pending_sink_transceivers, gst_object_ref (pad)); _add_pad (webrtc, pad); } return GST_PAD (pad); } static void gst_webrtc_bin_release_pad (GstElement * element, GstPad * pad) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (element); GstWebRTCBinPad *webrtc_pad = GST_WEBRTC_BIN_PAD (pad); if (webrtc_pad->trans) gst_object_unref (webrtc_pad->trans); webrtc_pad->trans = NULL; _remove_pad (webrtc, webrtc_pad); PC_LOCK (webrtc); _update_need_negotiation (webrtc); PC_UNLOCK (webrtc); } static void gst_webrtc_bin_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object); switch (prop_id) { case PROP_STUN_SERVER: case PROP_TURN_SERVER: g_object_set_property (G_OBJECT (webrtc->priv->ice), pspec->name, value); break; case PROP_BUNDLE_POLICY: if (g_value_get_enum (value) == GST_WEBRTC_BUNDLE_POLICY_BALANCED) { GST_ERROR_OBJECT (object, "Balanced bundle policy not implemented yet"); } else { webrtc->bundle_policy = g_value_get_enum (value); } break; case PROP_ICE_TRANSPORT_POLICY: webrtc->ice_transport_policy = g_value_get_enum (value); g_object_set (webrtc->priv->ice, "force-relay", webrtc->ice_transport_policy == GST_WEBRTC_ICE_TRANSPORT_POLICY_RELAY ? TRUE : FALSE, NULL); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_webrtc_bin_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object); PC_LOCK (webrtc); switch (prop_id) { case PROP_CONNECTION_STATE: g_value_set_enum (value, webrtc->peer_connection_state); break; case PROP_SIGNALING_STATE: g_value_set_enum (value, webrtc->signaling_state); break; case PROP_ICE_GATHERING_STATE: g_value_set_enum (value, webrtc->ice_gathering_state); break; case PROP_ICE_CONNECTION_STATE: g_value_set_enum (value, webrtc->ice_connection_state); break; case PROP_LOCAL_DESCRIPTION: if (webrtc->pending_local_description) g_value_set_boxed (value, webrtc->pending_local_description); else if (webrtc->current_local_description) g_value_set_boxed (value, webrtc->current_local_description); else g_value_set_boxed (value, NULL); break; case PROP_CURRENT_LOCAL_DESCRIPTION: g_value_set_boxed (value, webrtc->current_local_description); break; case PROP_PENDING_LOCAL_DESCRIPTION: g_value_set_boxed (value, webrtc->pending_local_description); break; case PROP_REMOTE_DESCRIPTION: if (webrtc->pending_remote_description) g_value_set_boxed (value, webrtc->pending_remote_description); else if (webrtc->current_remote_description) g_value_set_boxed (value, webrtc->current_remote_description); else g_value_set_boxed (value, NULL); break; case PROP_CURRENT_REMOTE_DESCRIPTION: g_value_set_boxed (value, webrtc->current_remote_description); break; case PROP_PENDING_REMOTE_DESCRIPTION: g_value_set_boxed (value, webrtc->pending_remote_description); break; case PROP_STUN_SERVER: case PROP_TURN_SERVER: g_object_get_property (G_OBJECT (webrtc->priv->ice), pspec->name, value); break; case PROP_BUNDLE_POLICY: g_value_set_enum (value, webrtc->bundle_policy); break; case PROP_ICE_TRANSPORT_POLICY: g_value_set_enum (value, webrtc->ice_transport_policy); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } PC_UNLOCK (webrtc); } static void _free_pending_pad (GstPad * pad) { gst_object_unref (pad); } static void gst_webrtc_bin_dispose (GObject * object) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object); if (webrtc->priv->ice) gst_object_unref (webrtc->priv->ice); webrtc->priv->ice = NULL; if (webrtc->priv->ice_stream_map) g_array_free (webrtc->priv->ice_stream_map, TRUE); webrtc->priv->ice_stream_map = NULL; g_clear_object (&webrtc->priv->sctp_transport); G_OBJECT_CLASS (parent_class)->dispose (object); } static void gst_webrtc_bin_finalize (GObject * object) { GstWebRTCBin *webrtc = GST_WEBRTC_BIN (object); if (webrtc->priv->transports) g_ptr_array_free (webrtc->priv->transports, TRUE); webrtc->priv->transports = NULL; if (webrtc->priv->transceivers) g_ptr_array_free (webrtc->priv->transceivers, TRUE); webrtc->priv->transceivers = NULL; if (webrtc->priv->data_channels) g_ptr_array_free (webrtc->priv->data_channels, TRUE); webrtc->priv->data_channels = NULL; if (webrtc->priv->pending_data_channels) g_ptr_array_free (webrtc->priv->pending_data_channels, TRUE); webrtc->priv->pending_data_channels = NULL; if (webrtc->priv->pending_remote_ice_candidates) g_array_free (webrtc->priv->pending_remote_ice_candidates, TRUE); webrtc->priv->pending_remote_ice_candidates = NULL; if (webrtc->priv->pending_local_ice_candidates) g_array_free (webrtc->priv->pending_local_ice_candidates, TRUE); webrtc->priv->pending_local_ice_candidates = NULL; if (webrtc->priv->session_mid_map) g_array_free (webrtc->priv->session_mid_map, TRUE); webrtc->priv->session_mid_map = NULL; if (webrtc->priv->pending_pads) g_list_free_full (webrtc->priv->pending_pads, (GDestroyNotify) _free_pending_pad); webrtc->priv->pending_pads = NULL; if (webrtc->priv->pending_sink_transceivers) g_list_free_full (webrtc->priv->pending_sink_transceivers, (GDestroyNotify) gst_object_unref); webrtc->priv->pending_sink_transceivers = NULL; if (webrtc->current_local_description) gst_webrtc_session_description_free (webrtc->current_local_description); webrtc->current_local_description = NULL; if (webrtc->pending_local_description) gst_webrtc_session_description_free (webrtc->pending_local_description); webrtc->pending_local_description = NULL; if (webrtc->current_remote_description) gst_webrtc_session_description_free (webrtc->current_remote_description); webrtc->current_remote_description = NULL; if (webrtc->pending_remote_description) gst_webrtc_session_description_free (webrtc->pending_remote_description); webrtc->pending_remote_description = NULL; if (webrtc->priv->last_generated_answer) gst_webrtc_session_description_free (webrtc->priv->last_generated_answer); webrtc->priv->last_generated_answer = NULL; if (webrtc->priv->last_generated_offer) gst_webrtc_session_description_free (webrtc->priv->last_generated_offer); webrtc->priv->last_generated_offer = NULL; if (webrtc->priv->stats) gst_structure_free (webrtc->priv->stats); webrtc->priv->stats = NULL; g_mutex_clear (ICE_GET_LOCK (webrtc)); g_mutex_clear (PC_GET_LOCK (webrtc)); g_cond_clear (PC_GET_COND (webrtc)); G_OBJECT_CLASS (parent_class)->finalize (object); } static void gst_webrtc_bin_class_init (GstWebRTCBinClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstElementClass *element_class = (GstElementClass *) klass; element_class->request_new_pad = gst_webrtc_bin_request_new_pad; element_class->release_pad = gst_webrtc_bin_release_pad; element_class->change_state = gst_webrtc_bin_change_state; gst_element_class_add_static_pad_template_with_gtype (element_class, &sink_template, GST_TYPE_WEBRTC_BIN_PAD); gst_element_class_add_static_pad_template (element_class, &src_template); gst_element_class_set_metadata (element_class, "WebRTC Bin", "Filter/Network/WebRTC", "A bin for webrtc connections", "Matthew Waters "); gobject_class->get_property = gst_webrtc_bin_get_property; gobject_class->set_property = gst_webrtc_bin_set_property; gobject_class->dispose = gst_webrtc_bin_dispose; gobject_class->finalize = gst_webrtc_bin_finalize; g_object_class_install_property (gobject_class, PROP_LOCAL_DESCRIPTION, g_param_spec_boxed ("local-description", "Local Description", "The local SDP description in use for this connection. " "Favours a pending description over the current description", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CURRENT_LOCAL_DESCRIPTION, g_param_spec_boxed ("current-local-description", "Current Local Description", "The local description that was successfully negotiated the last time " "the connection transitioned into the stable state", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PENDING_LOCAL_DESCRIPTION, g_param_spec_boxed ("pending-local-description", "Pending Local Description", "The local description that is in the process of being negotiated plus " "any local candidates that have been generated by the ICE Agent since the " "offer or answer was created", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_REMOTE_DESCRIPTION, g_param_spec_boxed ("remote-description", "Remote Description", "The remote SDP description to use for this connection. " "Favours a pending description over the current description", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CURRENT_REMOTE_DESCRIPTION, g_param_spec_boxed ("current-remote-description", "Current Remote Description", "The last remote description that was successfully negotiated the last " "time the connection transitioned into the stable state plus any remote " "candidates that have been supplied via addIceCandidate() since the offer " "or answer was created", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_PENDING_REMOTE_DESCRIPTION, g_param_spec_boxed ("pending-remote-description", "Pending Remote Description", "The remote description that is in the process of being negotiated, " "complete with any remote candidates that have been supplied via " "addIceCandidate() since the offer or answer was created", GST_TYPE_WEBRTC_SESSION_DESCRIPTION, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_STUN_SERVER, g_param_spec_string ("stun-server", "STUN Server", "The STUN server of the form stun://hostname:port", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_TURN_SERVER, g_param_spec_string ("turn-server", "TURN Server", "The TURN server of the form turn(s)://username:password@host:port. " "This is a convenience property, use #GstWebRTCBin::add-turn-server " "if you wish to use multiple TURN servers", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_CONNECTION_STATE, g_param_spec_enum ("connection-state", "Connection State", "The overall connection state of this element", GST_TYPE_WEBRTC_PEER_CONNECTION_STATE, GST_WEBRTC_PEER_CONNECTION_STATE_NEW, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_SIGNALING_STATE, g_param_spec_enum ("signaling-state", "Signaling State", "The signaling state of this element", GST_TYPE_WEBRTC_SIGNALING_STATE, GST_WEBRTC_SIGNALING_STATE_STABLE, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ICE_CONNECTION_STATE, g_param_spec_enum ("ice-connection-state", "ICE connection state", "The collective connection state of all ICETransport's", GST_TYPE_WEBRTC_ICE_CONNECTION_STATE, GST_WEBRTC_ICE_CONNECTION_STATE_NEW, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ICE_GATHERING_STATE, g_param_spec_enum ("ice-gathering-state", "ICE gathering state", "The collective gathering state of all ICETransport's", GST_TYPE_WEBRTC_ICE_GATHERING_STATE, GST_WEBRTC_ICE_GATHERING_STATE_NEW, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_BUNDLE_POLICY, g_param_spec_enum ("bundle-policy", "Bundle Policy", "The policy to apply for bundling", GST_TYPE_WEBRTC_BUNDLE_POLICY, GST_WEBRTC_BUNDLE_POLICY_NONE, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (gobject_class, PROP_ICE_TRANSPORT_POLICY, g_param_spec_enum ("ice-transport-policy", "ICE Transport Policy", "The policy to apply for ICE transport", GST_TYPE_WEBRTC_ICE_TRANSPORT_POLICY, GST_WEBRTC_ICE_TRANSPORT_POLICY_ALL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); /** * GstWebRTCBin::create-offer: * @object: the #webrtcbin * @options: (nullable): create-offer options * @promise: a #GstPromise which will contain the offer */ gst_webrtc_bin_signals[CREATE_OFFER_SIGNAL] = g_signal_new_class_handler ("create-offer", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_create_offer), NULL, NULL, NULL, G_TYPE_NONE, 2, GST_TYPE_STRUCTURE, GST_TYPE_PROMISE); /** * GstWebRTCBin::create-answer: * @object: the #webrtcbin * @options: (nullable): create-answer options * @promise: a #GstPromise which will contain the answer */ gst_webrtc_bin_signals[CREATE_ANSWER_SIGNAL] = g_signal_new_class_handler ("create-answer", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_create_answer), NULL, NULL, NULL, G_TYPE_NONE, 2, GST_TYPE_STRUCTURE, GST_TYPE_PROMISE); /** * GstWebRTCBin::set-local-description: * @object: the #GstWebRTCBin * @desc: a #GstWebRTCSessionDescription description * @promise: (nullable): a #GstPromise to be notified when it's set */ gst_webrtc_bin_signals[SET_LOCAL_DESCRIPTION_SIGNAL] = g_signal_new_class_handler ("set-local-description", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_set_local_description), NULL, NULL, NULL, G_TYPE_NONE, 2, GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE); /** * GstWebRTCBin::set-remote-description: * @object: the #GstWebRTCBin * @desc: a #GstWebRTCSessionDescription description * @promise: (nullable): a #GstPromise to be notified when it's set */ gst_webrtc_bin_signals[SET_REMOTE_DESCRIPTION_SIGNAL] = g_signal_new_class_handler ("set-remote-description", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_set_remote_description), NULL, NULL, NULL, G_TYPE_NONE, 2, GST_TYPE_WEBRTC_SESSION_DESCRIPTION, GST_TYPE_PROMISE); /** * GstWebRTCBin::add-ice-candidate: * @object: the #webrtcbin * @mline_index: the index of the media description in the SDP * @ice-candidate: an ice candidate */ gst_webrtc_bin_signals[ADD_ICE_CANDIDATE_SIGNAL] = g_signal_new_class_handler ("add-ice-candidate", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_add_ice_candidate), NULL, NULL, NULL, G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING); /** * GstWebRTCBin::get-stats: * @object: the #webrtcbin * @pad: (nullable): A #GstPad to get the stats for, or %NULL for all * @promise: a #GstPromise for the result * * The @promise will contain the result of retrieving the session statistics. * The structure will be named 'application/x-webrtc-stats and contain the * following based on the webrtc-stats spec available from * https://www.w3.org/TR/webrtc-stats/. As the webrtc-stats spec is a draft * and is constantly changing these statistics may be changed to fit with * the latest spec. * * Each field key is a unique identifier for each RTCStats * (https://www.w3.org/TR/webrtc/#rtcstats-dictionary) value (another * GstStructure) in the RTCStatsReport * (https://www.w3.org/TR/webrtc/#rtcstatsreport-object). Each supported * field in the RTCStats subclass is outlined below. * * Each statistics structure contains the following values as defined by * the RTCStats dictionary (https://www.w3.org/TR/webrtc/#rtcstats-dictionary). * * "timestamp" G_TYPE_DOUBLE timestamp the statistics were generated * "type" GST_TYPE_WEBRTC_STATS_TYPE the type of statistics reported * "id" G_TYPE_STRING unique identifier * * RTCCodecStats supported fields (https://w3c.github.io/webrtc-stats/#codec-dict*) * * "payload-type" G_TYPE_UINT the rtp payload number in use * "clock-rate" G_TYPE_UINT the rtp clock-rate * * RTCRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#streamstats-dict*) * * "ssrc" G_TYPE_STRING the rtp sequence src in use * "transport-id" G_TYPE_STRING identifier for the associated RTCTransportStats for this stream * "codec-id" G_TYPE_STRING identifier for the associated RTCCodecStats for this stream * "fir-count" G_TYPE_UINT FIR requests received by the sender (only for local statistics) * "pli-count" G_TYPE_UINT PLI requests received by the sender (only for local statistics) * "nack-count" G_TYPE_UINT NACK requests received by the sender (only for local statistics) * * RTCReceivedStreamStats supported fields (https://w3c.github.io/webrtc-stats/#receivedrtpstats-dict*) * * "packets-received" G_TYPE_UINT64 number of packets received (only for local inbound) * "bytes-received" G_TYPE_UINT64 number of bytes received (only for local inbound) * "packets-lost" G_TYPE_UINT number of packets lost * "jitter" G_TYPE_DOUBLE packet jitter measured in secondss * * RTCInboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#inboundrtpstats-dict*) * * "remote-id" G_TYPE_STRING identifier for the associated RTCRemoteOutboundRTPStreamStats * * RTCRemoteInboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#remoteinboundrtpstats-dict*) * * "local-id" G_TYPE_STRING identifier for the associated RTCOutboundRTPSTreamStats * "round-trip-time" G_TYPE_DOUBLE round trip time of packets measured in seconds * * RTCSentRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#sentrtpstats-dict*) * * "packets-sent" G_TYPE_UINT64 number of packets sent (only for local outbound) * "bytes-sent" G_TYPE_UINT64 number of packets sent (only for local outbound) * * RTCOutboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#outboundrtpstats-dict*) * * "remote-id" G_TYPE_STRING identifier for the associated RTCRemoteInboundRTPSTreamStats * * RTCRemoteOutboundRTPStreamStats supported fields (https://w3c.github.io/webrtc-stats/#remoteoutboundrtpstats-dict*) * * "local-id" G_TYPE_STRING identifier for the associated RTCInboundRTPSTreamStats * */ gst_webrtc_bin_signals[GET_STATS_SIGNAL] = g_signal_new_class_handler ("get-stats", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_get_stats), NULL, NULL, NULL, G_TYPE_NONE, 2, GST_TYPE_PAD, GST_TYPE_PROMISE); /** * GstWebRTCBin::on-negotiation-needed: * @object: the #webrtcbin */ gst_webrtc_bin_signals[ON_NEGOTIATION_NEEDED_SIGNAL] = g_signal_new ("on-negotiation-needed", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 0); /** * GstWebRTCBin::on-ice-candidate: * @object: the #webrtcbin * @mline_index: the index of the media description in the SDP * @candidate: the ICE candidate */ gst_webrtc_bin_signals[ON_ICE_CANDIDATE_SIGNAL] = g_signal_new ("on-ice-candidate", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 2, G_TYPE_UINT, G_TYPE_STRING); /** * GstWebRTCBin::on-new-transceiver: * @object: the #webrtcbin * @candidate: the new #GstWebRTCRTPTransceiver */ gst_webrtc_bin_signals[ON_NEW_TRANSCEIVER_SIGNAL] = g_signal_new ("on-new-transceiver", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 1, GST_TYPE_WEBRTC_RTP_TRANSCEIVER); /** * GstWebRTCBin::on-data-channel: * @object: the #GstWebRTCBin * @candidate: the new `GstWebRTCDataChannel` */ gst_webrtc_bin_signals[ON_DATA_CHANNEL_SIGNAL] = g_signal_new ("on-data-channel", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL, G_TYPE_NONE, 1, GST_TYPE_WEBRTC_DATA_CHANNEL); /** * GstWebRTCBin::add-transceiver: * @object: the #webrtcbin * @direction: the direction of the new transceiver * @caps: (allow none): the codec preferences for this transceiver * * Returns: the new #GstWebRTCRTPTransceiver */ gst_webrtc_bin_signals[ADD_TRANSCEIVER_SIGNAL] = g_signal_new_class_handler ("add-transceiver", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_add_transceiver), NULL, NULL, NULL, GST_TYPE_WEBRTC_RTP_TRANSCEIVER, 2, GST_TYPE_WEBRTC_RTP_TRANSCEIVER_DIRECTION, GST_TYPE_CAPS); /** * GstWebRTCBin::get-transceivers: * @object: the #webrtcbin * * Returns: a #GArray of #GstWebRTCRTPTransceivers */ gst_webrtc_bin_signals[GET_TRANSCEIVERS_SIGNAL] = g_signal_new_class_handler ("get-transceivers", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_get_transceivers), NULL, NULL, NULL, G_TYPE_ARRAY, 0); /** * GstWebRTCBin::get-transceiver: * @object: the #GstWebRTCBin * @idx: The index of the transceiver * * Returns: (transfer full): the #GstWebRTCRTPTransceiver, or %NULL * Since: 1.16 */ gst_webrtc_bin_signals[GET_TRANSCEIVER_SIGNAL] = g_signal_new_class_handler ("get-transceiver", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_get_transceiver), NULL, NULL, NULL, GST_TYPE_WEBRTC_RTP_TRANSCEIVER, 1, G_TYPE_INT); /** * GstWebRTCBin::add-turn-server: * @object: the #GstWebRTCBin * @uri: The uri of the server of the form turn(s)://username:password@host:port * * Add a turn server to obtain ICE candidates from */ gst_webrtc_bin_signals[ADD_TURN_SERVER_SIGNAL] = g_signal_new_class_handler ("add-turn-server", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_add_turn_server), NULL, NULL, NULL, G_TYPE_BOOLEAN, 1, G_TYPE_STRING); /* * GstWebRTCBin::create-data-channel: * @object: the #GstWebRTCBin * @label: the label for the data channel * @options: a #GstStructure of options for creating the data channel * * The options dictionary is the same format as the RTCDataChannelInit * members outlined https://www.w3.org/TR/webrtc/#dom-rtcdatachannelinit and * and reproduced below * * ordered G_TYPE_BOOLEAN Whether the channal will send data with guaranteed ordering * max-packet-lifetime G_TYPE_INT The time in milliseconds to attempt transmitting unacknowledged data. -1 for unset * max-retransmits G_TYPE_INT The number of times data will be attempted to be transmitted without acknowledgement before dropping * protocol G_TYPE_STRING The subprotocol used by this channel * negotiated G_TYPE_BOOLEAN Whether the created data channel should not perform in-band chnanel announcement. If %TRUE, then application must negotiate the channel itself and create the corresponding channel on the peer with the same id. * id G_TYPE_INT Override the default identifier selection of this channel * priority GST_TYPE_WEBRTC_PRIORITY_TYPE The priority to use for this channel * * Returns: (transfer full): a new data channel object */ gst_webrtc_bin_signals[CREATE_DATA_CHANNEL_SIGNAL] = g_signal_new_class_handler ("create-data-channel", G_TYPE_FROM_CLASS (klass), G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION, G_CALLBACK (gst_webrtc_bin_create_data_channel), NULL, NULL, NULL, GST_TYPE_WEBRTC_DATA_CHANNEL, 2, G_TYPE_STRING, GST_TYPE_STRUCTURE); } static void _unparent_and_unref (GObject * object) { GstObject *obj = GST_OBJECT (object); GST_OBJECT_PARENT (obj) = NULL; gst_object_unref (obj); } static void _transport_free (GObject * object) { TransportStream *stream = (TransportStream *) object; GstWebRTCBin *webrtc; webrtc = GST_WEBRTC_BIN (GST_OBJECT_PARENT (stream)); if (stream->transport) { g_signal_handlers_disconnect_by_data (stream->transport->transport, webrtc); g_signal_handlers_disconnect_by_data (stream->transport, webrtc); } if (stream->rtcp_transport) { g_signal_handlers_disconnect_by_data (stream->rtcp_transport->transport, webrtc); g_signal_handlers_disconnect_by_data (stream->rtcp_transport, webrtc); } gst_object_unref (object); } static void gst_webrtc_bin_init (GstWebRTCBin * webrtc) { webrtc->priv = gst_webrtc_bin_get_instance_private (webrtc); g_mutex_init (PC_GET_LOCK (webrtc)); g_cond_init (PC_GET_COND (webrtc)); g_mutex_init (ICE_GET_LOCK (webrtc)); webrtc->rtpbin = _create_rtpbin (webrtc); gst_bin_add (GST_BIN (webrtc), webrtc->rtpbin); webrtc->priv->transceivers = g_ptr_array_new_with_free_func ((GDestroyNotify) _unparent_and_unref); webrtc->priv->transports = g_ptr_array_new_with_free_func ((GDestroyNotify) _transport_free); webrtc->priv->data_channels = g_ptr_array_new_with_free_func ((GDestroyNotify) gst_object_unref); webrtc->priv->pending_data_channels = g_ptr_array_new_with_free_func ((GDestroyNotify) gst_object_unref); webrtc->priv->session_mid_map = g_array_new (FALSE, TRUE, sizeof (SessionMidItem)); g_array_set_clear_func (webrtc->priv->session_mid_map, (GDestroyNotify) clear_session_mid_item); webrtc->priv->ice = gst_webrtc_ice_new (); g_signal_connect (webrtc->priv->ice, "on-ice-candidate", G_CALLBACK (_on_local_ice_candidate_cb), webrtc); webrtc->priv->ice_stream_map = g_array_new (FALSE, TRUE, sizeof (IceStreamItem)); webrtc->priv->pending_remote_ice_candidates = g_array_new (FALSE, TRUE, sizeof (IceCandidateItem)); g_array_set_clear_func (webrtc->priv->pending_remote_ice_candidates, (GDestroyNotify) _clear_ice_candidate_item); webrtc->priv->pending_local_ice_candidates = g_array_new (FALSE, TRUE, sizeof (IceCandidateItem)); g_array_set_clear_func (webrtc->priv->pending_local_ice_candidates, (GDestroyNotify) _clear_ice_candidate_item); /* we start off closed until we move to READY */ webrtc->priv->is_closed = TRUE; }