/* * Copyright 2012 The WebRTC project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #ifndef PC_PEER_CONNECTION_H_ #define PC_PEER_CONNECTION_H_ #include #include #include #include #include #include #include "api/peer_connection_interface.h" #include "api/transport/data_channel_transport_interface.h" #include "api/turn_customizer.h" #include "pc/data_channel_controller.h" #include "pc/ice_server_parsing.h" #include "pc/jsep_transport_controller.h" #include "pc/peer_connection_factory.h" #include "pc/peer_connection_internal.h" #include "pc/rtc_stats_collector.h" #include "pc/rtp_sender.h" #include "pc/rtp_transceiver.h" #include "pc/sctp_transport.h" #include "pc/stats_collector.h" #include "pc/stream_collection.h" #include "pc/webrtc_session_description_factory.h" #include "rtc_base/experiments/field_trial_parser.h" #include "rtc_base/operations_chain.h" #include "rtc_base/race_checker.h" #include "rtc_base/unique_id_generator.h" #include "rtc_base/weak_ptr.h" namespace webrtc { class MediaStreamObserver; class VideoRtpReceiver; class RtcEventLog; // PeerConnection is the implementation of the PeerConnection object as defined // by the PeerConnectionInterface API surface. // The class currently is solely responsible for the following: // - Managing the session state machine (signaling state). // - Creating and initializing lower-level objects, like PortAllocator and // BaseChannels. // - Owning and managing the life cycle of the RtpSender/RtpReceiver and track // objects. // - Tracking the current and pending local/remote session descriptions. // The class currently is jointly responsible for the following: // - Parsing and interpreting SDP. // - Generating offers and answers based on the current state. // - The ICE state machine. // - Generating stats. class PeerConnection : public PeerConnectionInternal, public JsepTransportController::Observer, public RtpSenderBase::SetStreamsObserver, public rtc::MessageHandler, public sigslot::has_slots<> { public: // A bit in the usage pattern is registered when its defining event occurs at // least once. enum class UsageEvent : int { TURN_SERVER_ADDED = 0x01, STUN_SERVER_ADDED = 0x02, DATA_ADDED = 0x04, AUDIO_ADDED = 0x08, VIDEO_ADDED = 0x10, // |SetLocalDescription| returns successfully. SET_LOCAL_DESCRIPTION_SUCCEEDED = 0x20, // |SetRemoteDescription| returns successfully. SET_REMOTE_DESCRIPTION_SUCCEEDED = 0x40, // A local candidate (with type host, server-reflexive, or relay) is // collected. CANDIDATE_COLLECTED = 0x80, // A remote candidate is successfully added via |AddIceCandidate|. ADD_ICE_CANDIDATE_SUCCEEDED = 0x100, ICE_STATE_CONNECTED = 0x200, CLOSE_CALLED = 0x400, // A local candidate with private IP is collected. PRIVATE_CANDIDATE_COLLECTED = 0x800, // A remote candidate with private IP is added, either via AddiceCandidate // or from the remote description. REMOTE_PRIVATE_CANDIDATE_ADDED = 0x1000, // A local mDNS candidate is collected. MDNS_CANDIDATE_COLLECTED = 0x2000, // A remote mDNS candidate is added, either via AddIceCandidate or from the // remote description. REMOTE_MDNS_CANDIDATE_ADDED = 0x4000, // A local candidate with IPv6 address is collected. IPV6_CANDIDATE_COLLECTED = 0x8000, // A remote candidate with IPv6 address is added, either via AddIceCandidate // or from the remote description. REMOTE_IPV6_CANDIDATE_ADDED = 0x10000, // A remote candidate (with type host, server-reflexive, or relay) is // successfully added, either via AddIceCandidate or from the remote // description. REMOTE_CANDIDATE_ADDED = 0x20000, // An explicit host-host candidate pair is selected, i.e. both the local and // the remote candidates have the host type. This does not include candidate // pairs formed with equivalent prflx remote candidates, e.g. a host-prflx // pair where the prflx candidate has the same base as a host candidate of // the remote peer. DIRECT_CONNECTION_SELECTED = 0x40000, MAX_VALUE = 0x80000, }; explicit PeerConnection(PeerConnectionFactory* factory, std::unique_ptr event_log, std::unique_ptr call); bool Initialize( const PeerConnectionInterface::RTCConfiguration& configuration, PeerConnectionDependencies dependencies); rtc::scoped_refptr local_streams() override; rtc::scoped_refptr remote_streams() override; bool AddStream(MediaStreamInterface* local_stream) override; void RemoveStream(MediaStreamInterface* local_stream) override; RTCErrorOr> AddTrack( rtc::scoped_refptr track, const std::vector& stream_ids) override; bool RemoveTrack(RtpSenderInterface* sender) override; RTCError RemoveTrackNew( rtc::scoped_refptr sender) override; RTCErrorOr> AddTransceiver( rtc::scoped_refptr track) override; RTCErrorOr> AddTransceiver( rtc::scoped_refptr track, const RtpTransceiverInit& init) override; RTCErrorOr> AddTransceiver( cricket::MediaType media_type) override; RTCErrorOr> AddTransceiver( cricket::MediaType media_type, const RtpTransceiverInit& init) override; // Gets the DTLS SSL certificate associated with the audio transport on the // remote side. This will become populated once the DTLS connection with the // peer has been completed, as indicated by the ICE connection state // transitioning to kIceConnectionCompleted. // Note that this will be removed once we implement RTCDtlsTransport which // has standardized method for getting this information. // See https://www.w3.org/TR/webrtc/#rtcdtlstransport-interface std::unique_ptr GetRemoteAudioSSLCertificate(); // Version of the above method that returns the full certificate chain. std::unique_ptr GetRemoteAudioSSLCertChain(); rtc::scoped_refptr CreateSender( const std::string& kind, const std::string& stream_id) override; std::vector> GetSenders() const override; std::vector> GetReceivers() const override; std::vector> GetTransceivers() const override; rtc::scoped_refptr CreateDataChannel( const std::string& label, const DataChannelInit* config) override; // WARNING: LEGACY. See peerconnectioninterface.h bool GetStats(StatsObserver* observer, webrtc::MediaStreamTrackInterface* track, StatsOutputLevel level) override; // Spec-complaint GetStats(). See peerconnectioninterface.h void GetStats(RTCStatsCollectorCallback* callback) override; void GetStats( rtc::scoped_refptr selector, rtc::scoped_refptr callback) override; void GetStats( rtc::scoped_refptr selector, rtc::scoped_refptr callback) override; void ClearStatsCache() override; SignalingState signaling_state() override; IceConnectionState ice_connection_state() override; IceConnectionState standardized_ice_connection_state() override; PeerConnectionState peer_connection_state() override; IceGatheringState ice_gathering_state() override; absl::optional can_trickle_ice_candidates() override; const SessionDescriptionInterface* local_description() const override; const SessionDescriptionInterface* remote_description() const override; const SessionDescriptionInterface* current_local_description() const override; const SessionDescriptionInterface* current_remote_description() const override; const SessionDescriptionInterface* pending_local_description() const override; const SessionDescriptionInterface* pending_remote_description() const override; void RestartIce() override; // JSEP01 void CreateOffer(CreateSessionDescriptionObserver* observer, const RTCOfferAnswerOptions& options) override; void CreateAnswer(CreateSessionDescriptionObserver* observer, const RTCOfferAnswerOptions& options) override; void SetLocalDescription( std::unique_ptr desc, rtc::scoped_refptr observer) override; void SetLocalDescription( rtc::scoped_refptr observer) override; // TODO(https://crbug.com/webrtc/11798): Delete these methods in favor of the // ones taking SetLocalDescriptionObserverInterface as argument. void SetLocalDescription(SetSessionDescriptionObserver* observer, SessionDescriptionInterface* desc) override; void SetLocalDescription(SetSessionDescriptionObserver* observer) override; void SetRemoteDescription( std::unique_ptr desc, rtc::scoped_refptr observer) override; // TODO(https://crbug.com/webrtc/11798): Delete this methods in favor of the // ones taking SetRemoteDescriptionObserverInterface as argument. void SetRemoteDescription(SetSessionDescriptionObserver* observer, SessionDescriptionInterface* desc) override; PeerConnectionInterface::RTCConfiguration GetConfiguration() override; RTCError SetConfiguration( const PeerConnectionInterface::RTCConfiguration& configuration) override; bool AddIceCandidate(const IceCandidateInterface* candidate) override; void AddIceCandidate(std::unique_ptr candidate, std::function callback) override; bool RemoveIceCandidates( const std::vector& candidates) override; RTCError SetBitrate(const BitrateSettings& bitrate) override; void SetAudioPlayout(bool playout) override; void SetAudioRecording(bool recording) override; rtc::scoped_refptr LookupDtlsTransportByMid( const std::string& mid) override; rtc::scoped_refptr LookupDtlsTransportByMidInternal( const std::string& mid); rtc::scoped_refptr GetSctpTransport() const override; void AddAdaptationResource(rtc::scoped_refptr resource) override; bool StartRtcEventLog(std::unique_ptr output, int64_t output_period_ms) override; bool StartRtcEventLog(std::unique_ptr output) override; void StopRtcEventLog() override; void Close() override; rtc::Thread* signaling_thread() const final { return factory_->signaling_thread(); } // PeerConnectionInternal implementation. rtc::Thread* network_thread() const final { return factory_->network_thread(); } rtc::Thread* worker_thread() const final { return factory_->worker_thread(); } std::string session_id() const override { RTC_DCHECK_RUN_ON(signaling_thread()); return session_id_; } bool initial_offerer() const override { RTC_DCHECK_RUN_ON(signaling_thread()); return transport_controller_ && transport_controller_->initial_offerer(); } std::vector< rtc::scoped_refptr>> GetTransceiversInternal() const override { RTC_DCHECK_RUN_ON(signaling_thread()); return transceivers_; } sigslot::signal1& SignalRtpDataChannelCreated() override { return data_channel_controller_.SignalRtpDataChannelCreated(); } sigslot::signal1& SignalSctpDataChannelCreated() override { return data_channel_controller_.SignalSctpDataChannelCreated(); } cricket::RtpDataChannel* rtp_data_channel() const override { return data_channel_controller_.rtp_data_channel(); } std::vector GetDataChannelStats() const override; absl::optional sctp_transport_name() const override; cricket::CandidateStatsList GetPooledCandidateStats() const override; std::map GetTransportNamesByMid() const override; std::map GetTransportStatsByNames( const std::set& transport_names) override; Call::Stats GetCallStats() override; bool GetLocalCertificate( const std::string& transport_name, rtc::scoped_refptr* certificate) override; std::unique_ptr GetRemoteSSLCertChain( const std::string& transport_name) override; bool IceRestartPending(const std::string& content_name) const override; bool NeedsIceRestart(const std::string& content_name) const override; bool GetSslRole(const std::string& content_name, rtc::SSLRole* role) override; // Functions needed by DataChannelController void NoteDataAddedEvent() { NoteUsageEvent(UsageEvent::DATA_ADDED); } // Returns the observer. Will crash on CHECK if the observer is removed. PeerConnectionObserver* Observer() const; bool IsClosed() const { RTC_DCHECK_RUN_ON(signaling_thread()); return signaling_state_ == PeerConnectionInterface::kClosed; } // Get current SSL role used by SCTP's underlying transport. bool GetSctpSslRole(rtc::SSLRole* role); // Handler for the "channel closed" signal void OnSctpDataChannelClosed(DataChannelInterface* channel); // Functions made public for testing. void ReturnHistogramVeryQuicklyForTesting() { RTC_DCHECK_RUN_ON(signaling_thread()); return_histogram_very_quickly_ = true; } void RequestUsagePatternReportForTesting(); absl::optional sctp_mid() { RTC_DCHECK_RUN_ON(signaling_thread()); return sctp_mid_s_; } protected: ~PeerConnection() override; private: class ImplicitCreateSessionDescriptionObserver; friend class ImplicitCreateSessionDescriptionObserver; class SetSessionDescriptionObserverAdapter; friend class SetSessionDescriptionObserverAdapter; // Represents the [[LocalIceCredentialsToReplace]] internal slot in the spec. // It makes the next CreateOffer() produce new ICE credentials even if // RTCOfferAnswerOptions::ice_restart is false. // https://w3c.github.io/webrtc-pc/#dfn-localufragstoreplace // TODO(hbos): When JsepTransportController/JsepTransport supports rollback, // move this type of logic to JsepTransportController/JsepTransport. class LocalIceCredentialsToReplace; struct RtpSenderInfo { RtpSenderInfo() : first_ssrc(0) {} RtpSenderInfo(const std::string& stream_id, const std::string sender_id, uint32_t ssrc) : stream_id(stream_id), sender_id(sender_id), first_ssrc(ssrc) {} bool operator==(const RtpSenderInfo& other) { return this->stream_id == other.stream_id && this->sender_id == other.sender_id && this->first_ssrc == other.first_ssrc; } std::string stream_id; std::string sender_id; // An RtpSender can have many SSRCs. The first one is used as a sort of ID // for communicating with the lower layers. uint32_t first_ssrc; }; // Captures partial state to be used for rollback. Applicable only in // Unified Plan. class TransceiverStableState { public: TransceiverStableState() {} void set_newly_created(); void SetMSectionIfUnset(absl::optional mid, absl::optional mline_index); void SetRemoteStreamIdsIfUnset(const std::vector& ids); absl::optional mid() const { return mid_; } absl::optional mline_index() const { return mline_index_; } absl::optional> remote_stream_ids() const { return remote_stream_ids_; } bool has_m_section() const { return has_m_section_; } bool newly_created() const { return newly_created_; } private: absl::optional mid_; absl::optional mline_index_; absl::optional> remote_stream_ids_; // Indicates that mid value from stable state has been captured and // that rollback has to restore the transceiver. Also protects against // subsequent overwrites. bool has_m_section_ = false; // Indicates that the transceiver was created as part of applying a // description to track potential need for removing transceiver during // rollback. bool newly_created_ = false; }; // Implements MessageHandler. void OnMessage(rtc::Message* msg) override; // Plan B helpers for getting the voice/video media channels for the single // audio/video transceiver, if it exists. cricket::VoiceMediaChannel* voice_media_channel() const RTC_RUN_ON(signaling_thread()); cricket::VideoMediaChannel* video_media_channel() const RTC_RUN_ON(signaling_thread()); std::vector>> GetSendersInternal() const RTC_RUN_ON(signaling_thread()); std::vector< rtc::scoped_refptr>> GetReceiversInternal() const RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr> GetAudioTransceiver() const RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr> GetVideoTransceiver() const RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr> GetFirstAudioTransceiver() const RTC_RUN_ON(signaling_thread()); // Implementation of the offer/answer exchange operations. These are chained // onto the |operations_chain_| when the public CreateOffer(), CreateAnswer(), // SetLocalDescription() and SetRemoteDescription() methods are invoked. void DoCreateOffer( const RTCOfferAnswerOptions& options, rtc::scoped_refptr observer); void DoCreateAnswer( const RTCOfferAnswerOptions& options, rtc::scoped_refptr observer); void DoSetLocalDescription( std::unique_ptr desc, rtc::scoped_refptr observer); void DoSetRemoteDescription( std::unique_ptr desc, rtc::scoped_refptr observer); void CreateAudioReceiver(MediaStreamInterface* stream, const RtpSenderInfo& remote_sender_info) RTC_RUN_ON(signaling_thread()); void CreateVideoReceiver(MediaStreamInterface* stream, const RtpSenderInfo& remote_sender_info) RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr RemoveAndStopReceiver( const RtpSenderInfo& remote_sender_info) RTC_RUN_ON(signaling_thread()); // May be called either by AddStream/RemoveStream, or when a track is // added/removed from a stream previously added via AddStream. void AddAudioTrack(AudioTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void RemoveAudioTrack(AudioTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void AddVideoTrack(VideoTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void RemoveVideoTrack(VideoTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); // AddTrack implementation when Unified Plan is specified. RTCErrorOr> AddTrackUnifiedPlan( rtc::scoped_refptr track, const std::vector& stream_ids) RTC_RUN_ON(signaling_thread()); // AddTrack implementation when Plan B is specified. RTCErrorOr> AddTrackPlanB( rtc::scoped_refptr track, const std::vector& stream_ids) RTC_RUN_ON(signaling_thread()); // Returns the first RtpTransceiver suitable for a newly added track, if such // transceiver is available. rtc::scoped_refptr> FindFirstTransceiverForAddedTrack( rtc::scoped_refptr track) RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr> FindTransceiverBySender(rtc::scoped_refptr sender) RTC_RUN_ON(signaling_thread()); // Internal implementation for AddTransceiver family of methods. If // |fire_callback| is set, fires OnRenegotiationNeeded callback if successful. RTCErrorOr> AddTransceiver( cricket::MediaType media_type, rtc::scoped_refptr track, const RtpTransceiverInit& init, bool fire_callback = true) RTC_RUN_ON(signaling_thread()); rtc::scoped_refptr> CreateSender(cricket::MediaType media_type, const std::string& id, rtc::scoped_refptr track, const std::vector& stream_ids, const std::vector& send_encodings); rtc::scoped_refptr> CreateReceiver(cricket::MediaType media_type, const std::string& receiver_id); // Create a new RtpTransceiver of the given type and add it to the list of // transceivers. rtc::scoped_refptr> CreateAndAddTransceiver( rtc::scoped_refptr> sender, rtc::scoped_refptr> receiver) RTC_RUN_ON(signaling_thread()); void SetIceConnectionState(IceConnectionState new_state) RTC_RUN_ON(signaling_thread()); void SetStandardizedIceConnectionState( PeerConnectionInterface::IceConnectionState new_state) RTC_RUN_ON(signaling_thread()); void SetConnectionState( PeerConnectionInterface::PeerConnectionState new_state) RTC_RUN_ON(signaling_thread()); // Called any time the IceGatheringState changes. void OnIceGatheringChange(IceGatheringState new_state) RTC_RUN_ON(signaling_thread()); // New ICE candidate has been gathered. void OnIceCandidate(std::unique_ptr candidate) RTC_RUN_ON(signaling_thread()); // Gathering of an ICE candidate failed. void OnIceCandidateError(const std::string& address, int port, const std::string& url, int error_code, const std::string& error_text) RTC_RUN_ON(signaling_thread()); // Some local ICE candidates have been removed. void OnIceCandidatesRemoved(const std::vector& candidates) RTC_RUN_ON(signaling_thread()); void OnSelectedCandidatePairChanged( const cricket::CandidatePairChangeEvent& event) RTC_RUN_ON(signaling_thread()); // Update the state, signaling if necessary. void ChangeSignalingState(SignalingState signaling_state) RTC_RUN_ON(signaling_thread()); // Signals from MediaStreamObserver. void OnAudioTrackAdded(AudioTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void OnAudioTrackRemoved(AudioTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void OnVideoTrackAdded(VideoTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void OnVideoTrackRemoved(VideoTrackInterface* track, MediaStreamInterface* stream) RTC_RUN_ON(signaling_thread()); void PostSetSessionDescriptionSuccess( SetSessionDescriptionObserver* observer); void PostSetSessionDescriptionFailure(SetSessionDescriptionObserver* observer, RTCError&& error); void PostCreateSessionDescriptionFailure( CreateSessionDescriptionObserver* observer, RTCError error); // Synchronous implementations of SetLocalDescription/SetRemoteDescription // that return an RTCError instead of invoking a callback. RTCError ApplyLocalDescription( std::unique_ptr desc); RTCError ApplyRemoteDescription( std::unique_ptr desc); // Updates the local RtpTransceivers according to the JSEP rules. Called as // part of setting the local/remote description. RTCError UpdateTransceiversAndDataChannels( cricket::ContentSource source, const SessionDescriptionInterface& new_session, const SessionDescriptionInterface* old_local_description, const SessionDescriptionInterface* old_remote_description) RTC_RUN_ON(signaling_thread()); // Either creates or destroys the transceiver's BaseChannel according to the // given media section. RTCError UpdateTransceiverChannel( rtc::scoped_refptr> transceiver, const cricket::ContentInfo& content, const cricket::ContentGroup* bundle_group) RTC_RUN_ON(signaling_thread()); // Either creates or destroys the local data channel according to the given // media section. RTCError UpdateDataChannel(cricket::ContentSource source, const cricket::ContentInfo& content, const cricket::ContentGroup* bundle_group) RTC_RUN_ON(signaling_thread()); // Associate the given transceiver according to the JSEP rules. RTCErrorOr< rtc::scoped_refptr>> AssociateTransceiver(cricket::ContentSource source, SdpType type, size_t mline_index, const cricket::ContentInfo& content, const cricket::ContentInfo* old_local_content, const cricket::ContentInfo* old_remote_content) RTC_RUN_ON(signaling_thread()); // Returns the RtpTransceiver, if found, that is associated to the given MID. rtc::scoped_refptr> GetAssociatedTransceiver(const std::string& mid) const RTC_RUN_ON(signaling_thread()); // Returns the RtpTransceiver, if found, that was assigned to the given mline // index in CreateOffer. rtc::scoped_refptr> GetTransceiverByMLineIndex(size_t mline_index) const RTC_RUN_ON(signaling_thread()); // Returns an RtpTransciever, if available, that can be used to receive the // given media type according to JSEP rules. rtc::scoped_refptr> FindAvailableTransceiverToReceive(cricket::MediaType media_type) const RTC_RUN_ON(signaling_thread()); // Returns the media section in the given session description that is // associated with the RtpTransceiver. Returns null if none found or this // RtpTransceiver is not associated. Logic varies depending on the // SdpSemantics specified in the configuration. const cricket::ContentInfo* FindMediaSectionForTransceiver( rtc::scoped_refptr> transceiver, const SessionDescriptionInterface* sdesc) const RTC_RUN_ON(signaling_thread()); // Runs the algorithm **set the associated remote streams** specified in // https://w3c.github.io/webrtc-pc/#set-associated-remote-streams. void SetAssociatedRemoteStreams( rtc::scoped_refptr receiver, const std::vector& stream_ids, std::vector>* added_streams, std::vector>* removed_streams) RTC_RUN_ON(signaling_thread()); // Runs the algorithm **process the removal of a remote track** specified in // the WebRTC specification. // This method will update the following lists: // |remove_list| is the list of transceivers for which the receiving track is // being removed. // |removed_streams| is the list of streams which no longer have a receiving // track so should be removed. // https://w3c.github.io/webrtc-pc/#process-remote-track-removal void ProcessRemovalOfRemoteTrack( rtc::scoped_refptr> transceiver, std::vector>* remove_list, std::vector>* removed_streams) RTC_RUN_ON(signaling_thread()); void RemoveRemoteStreamsIfEmpty( const std::vector>& remote_streams, std::vector>* removed_streams) RTC_RUN_ON(signaling_thread()); void OnNegotiationNeeded(); // Returns a MediaSessionOptions struct with options decided by |options|, // the local MediaStreams and DataChannels. void GetOptionsForOffer(const PeerConnectionInterface::RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); void GetOptionsForPlanBOffer( const PeerConnectionInterface::RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); void GetOptionsForUnifiedPlanOffer( const PeerConnectionInterface::RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); RTCError HandleLegacyOfferOptions(const RTCOfferAnswerOptions& options) RTC_RUN_ON(signaling_thread()); void RemoveRecvDirectionFromReceivingTransceiversOfType( cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); void AddUpToOneReceivingTransceiverOfType(cricket::MediaType media_type); std::vector< rtc::scoped_refptr>> GetReceivingTransceiversOfType(cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Returns a MediaSessionOptions struct with options decided by // |constraints|, the local MediaStreams and DataChannels. void GetOptionsForAnswer(const RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); void GetOptionsForPlanBAnswer( const PeerConnectionInterface::RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); void GetOptionsForUnifiedPlanAnswer( const PeerConnectionInterface::RTCOfferAnswerOptions& offer_answer_options, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); // Generates MediaDescriptionOptions for the |session_opts| based on existing // local description or remote description. void GenerateMediaDescriptionOptions( const SessionDescriptionInterface* session_desc, RtpTransceiverDirection audio_direction, RtpTransceiverDirection video_direction, absl::optional* audio_index, absl::optional* video_index, absl::optional* data_index, cricket::MediaSessionOptions* session_options) RTC_RUN_ON(signaling_thread()); // Generates the active MediaDescriptionOptions for the local data channel // given the specified MID. cricket::MediaDescriptionOptions GetMediaDescriptionOptionsForActiveData( const std::string& mid) const RTC_RUN_ON(signaling_thread()); // Generates the rejected MediaDescriptionOptions for the local data channel // given the specified MID. cricket::MediaDescriptionOptions GetMediaDescriptionOptionsForRejectedData( const std::string& mid) const RTC_RUN_ON(signaling_thread()); // Returns the MID for the data section associated with either the // RtpDataChannel or SCTP data channel, if it has been set. If no data // channels are configured this will return nullopt. absl::optional GetDataMid() const RTC_RUN_ON(signaling_thread()); // Remove all local and remote senders of type |media_type|. // Called when a media type is rejected (m-line set to port 0). void RemoveSenders(cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Makes sure a MediaStreamTrack is created for each StreamParam in |streams|, // and existing MediaStreamTracks are removed if there is no corresponding // StreamParam. If |default_track_needed| is true, a default MediaStreamTrack // is created if it doesn't exist; if false, it's removed if it exists. // |media_type| is the type of the |streams| and can be either audio or video. // If a new MediaStream is created it is added to |new_streams|. void UpdateRemoteSendersList( const std::vector& streams, bool default_track_needed, cricket::MediaType media_type, StreamCollection* new_streams) RTC_RUN_ON(signaling_thread()); // Triggered when a remote sender has been seen for the first time in a remote // session description. It creates a remote MediaStreamTrackInterface // implementation and triggers CreateAudioReceiver or CreateVideoReceiver. void OnRemoteSenderAdded(const RtpSenderInfo& sender_info, cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Triggered when a remote sender has been removed from a remote session // description. It removes the remote sender with id |sender_id| from a remote // MediaStream and triggers DestroyAudioReceiver or DestroyVideoReceiver. void OnRemoteSenderRemoved(const RtpSenderInfo& sender_info, cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Finds remote MediaStreams without any tracks and removes them from // |remote_streams_| and notifies the observer that the MediaStreams no longer // exist. void UpdateEndedRemoteMediaStreams() RTC_RUN_ON(signaling_thread()); // Loops through the vector of |streams| and finds added and removed // StreamParams since last time this method was called. // For each new or removed StreamParam, OnLocalSenderSeen or // OnLocalSenderRemoved is invoked. void UpdateLocalSenders(const std::vector& streams, cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Triggered when a local sender has been seen for the first time in a local // session description. // This method triggers CreateAudioSender or CreateVideoSender if the rtp // streams in the local SessionDescription can be mapped to a MediaStreamTrack // in a MediaStream in |local_streams_| void OnLocalSenderAdded(const RtpSenderInfo& sender_info, cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Triggered when a local sender has been removed from a local session // description. // This method triggers DestroyAudioSender or DestroyVideoSender if a stream // has been removed from the local SessionDescription and the stream can be // mapped to a MediaStreamTrack in a MediaStream in |local_streams_|. void OnLocalSenderRemoved(const RtpSenderInfo& sender_info, cricket::MediaType media_type) RTC_RUN_ON(signaling_thread()); // Returns true if the PeerConnection is configured to use Unified Plan // semantics for creating offers/answers and setting local/remote // descriptions. If this is true the RtpTransceiver API will also be available // to the user. If this is false, Plan B semantics are assumed. // TODO(bugs.webrtc.org/8530): Flip the default to be Unified Plan once // sufficient time has passed. bool IsUnifiedPlan() const RTC_RUN_ON(signaling_thread()) { return configuration_.sdp_semantics == SdpSemantics::kUnifiedPlan; } // The offer/answer machinery assumes the media section MID is present and // unique. To support legacy end points that do not supply a=mid lines, this // method will modify the session description to add MIDs generated according // to the SDP semantics. void FillInMissingRemoteMids(cricket::SessionDescription* remote_description) RTC_RUN_ON(signaling_thread()); // Return the RtpSender with the given track attached. rtc::scoped_refptr> FindSenderForTrack(MediaStreamTrackInterface* track) const RTC_RUN_ON(signaling_thread()); // Return the RtpSender with the given id, or null if none exists. rtc::scoped_refptr> FindSenderById(const std::string& sender_id) const RTC_RUN_ON(signaling_thread()); // Return the RtpReceiver with the given id, or null if none exists. rtc::scoped_refptr> FindReceiverById(const std::string& receiver_id) const RTC_RUN_ON(signaling_thread()); std::vector* GetRemoteSenderInfos( cricket::MediaType media_type); std::vector* GetLocalSenderInfos( cricket::MediaType media_type); const RtpSenderInfo* FindSenderInfo(const std::vector& infos, const std::string& stream_id, const std::string sender_id) const; // Returns the specified SCTP DataChannel in sctp_data_channels_, // or nullptr if not found. SctpDataChannel* FindDataChannelBySid(int sid) const RTC_RUN_ON(signaling_thread()); // Called when first configuring the port allocator. struct InitializePortAllocatorResult { bool enable_ipv6; }; InitializePortAllocatorResult InitializePortAllocator_n( const cricket::ServerAddresses& stun_servers, const std::vector& turn_servers, const RTCConfiguration& configuration); // Called when SetConfiguration is called to apply the supported subset // of the configuration on the network thread. bool ReconfigurePortAllocator_n( const cricket::ServerAddresses& stun_servers, const std::vector& turn_servers, IceTransportsType type, int candidate_pool_size, PortPrunePolicy turn_port_prune_policy, webrtc::TurnCustomizer* turn_customizer, absl::optional stun_candidate_keepalive_interval, bool have_local_description); // Starts output of an RTC event log to the given output object. // This function should only be called from the worker thread. bool StartRtcEventLog_w(std::unique_ptr output, int64_t output_period_ms); // Stops recording an RTC event log. // This function should only be called from the worker thread. void StopRtcEventLog_w(); // Ensures the configuration doesn't have any parameters with invalid values, // or values that conflict with other parameters. // // Returns RTCError::OK() if there are no issues. RTCError ValidateConfiguration(const RTCConfiguration& config) const; cricket::ChannelManager* channel_manager() const; enum class SessionError { kNone, // No error. kContent, // Error in BaseChannel SetLocalContent/SetRemoteContent. kTransport, // Error from the underlying transport. }; // Returns the last error in the session. See the enum above for details. SessionError session_error() const RTC_RUN_ON(signaling_thread()) { return session_error_; } const std::string& session_error_desc() const { return session_error_desc_; } cricket::ChannelInterface* GetChannel(const std::string& content_name); cricket::IceConfig ParseIceConfig( const PeerConnectionInterface::RTCConfiguration& config) const; cricket::DataChannelType data_channel_type() const; // Called when an RTCCertificate is generated or retrieved by // WebRTCSessionDescriptionFactory. Should happen before setLocalDescription. void OnCertificateReady( const rtc::scoped_refptr& certificate); void OnDtlsSrtpSetupFailure(cricket::BaseChannel*, bool rtcp); // Non-const versions of local_description()/remote_description(), for use // internally. SessionDescriptionInterface* mutable_local_description() RTC_RUN_ON(signaling_thread()) { return pending_local_description_ ? pending_local_description_.get() : current_local_description_.get(); } SessionDescriptionInterface* mutable_remote_description() RTC_RUN_ON(signaling_thread()) { return pending_remote_description_ ? pending_remote_description_.get() : current_remote_description_.get(); } // Updates the error state, signaling if necessary. void SetSessionError(SessionError error, const std::string& error_desc); RTCError UpdateSessionState(SdpType type, cricket::ContentSource source, const cricket::SessionDescription* description); // Push the media parts of the local or remote session description // down to all of the channels. RTCError PushdownMediaDescription(SdpType type, cricket::ContentSource source) RTC_RUN_ON(signaling_thread()); RTCError PushdownTransportDescription(cricket::ContentSource source, SdpType type); // Returns true and the TransportInfo of the given |content_name| // from |description|. Returns false if it's not available. static bool GetTransportDescription( const cricket::SessionDescription* description, const std::string& content_name, cricket::TransportDescription* info); // Enables media channels to allow sending of media. // This enables media to flow on all configured audio/video channels and the // RtpDataChannel. void EnableSending() RTC_RUN_ON(signaling_thread()); // Destroys all BaseChannels and destroys the SCTP data channel, if present. void DestroyAllChannels() RTC_RUN_ON(signaling_thread()); // Returns the media index for a local ice candidate given the content name. // Returns false if the local session description does not have a media // content called |content_name|. bool GetLocalCandidateMediaIndex(const std::string& content_name, int* sdp_mline_index) RTC_RUN_ON(signaling_thread()); // Uses all remote candidates in |remote_desc| in this session. bool UseCandidatesInSessionDescription( const SessionDescriptionInterface* remote_desc) RTC_RUN_ON(signaling_thread()); // Uses |candidate| in this session. bool UseCandidate(const IceCandidateInterface* candidate) RTC_RUN_ON(signaling_thread()); RTCErrorOr FindContentInfo( const SessionDescriptionInterface* description, const IceCandidateInterface* candidate) RTC_RUN_ON(signaling_thread()); // Deletes the corresponding channel of contents that don't exist in |desc|. // |desc| can be null. This means that all channels are deleted. void RemoveUnusedChannels(const cricket::SessionDescription* desc) RTC_RUN_ON(signaling_thread()); // Allocates media channels based on the |desc|. If |desc| doesn't have // the BUNDLE option, this method will disable BUNDLE in PortAllocator. // This method will also delete any existing media channels before creating. RTCError CreateChannels(const cricket::SessionDescription& desc) RTC_RUN_ON(signaling_thread()); // If the BUNDLE policy is max-bundle, then we know for sure that all // transports will be bundled from the start. This method returns the BUNDLE // group if that's the case, or null if BUNDLE will be negotiated later. An // error is returned if max-bundle is specified but the session description // does not have a BUNDLE group. RTCErrorOr GetEarlyBundleGroup( const cricket::SessionDescription& desc) const RTC_RUN_ON(signaling_thread()); // Helper methods to create media channels. cricket::VoiceChannel* CreateVoiceChannel(const std::string& mid) RTC_RUN_ON(signaling_thread()); cricket::VideoChannel* CreateVideoChannel(const std::string& mid) RTC_RUN_ON(signaling_thread()); bool CreateDataChannel(const std::string& mid) RTC_RUN_ON(signaling_thread()); bool SetupDataChannelTransport_n(const std::string& mid) RTC_RUN_ON(network_thread()); void TeardownDataChannelTransport_n() RTC_RUN_ON(network_thread()); bool ValidateBundleSettings(const cricket::SessionDescription* desc); bool HasRtcpMuxEnabled(const cricket::ContentInfo* content); // Below methods are helper methods which verifies SDP. RTCError ValidateSessionDescription(const SessionDescriptionInterface* sdesc, cricket::ContentSource source) RTC_RUN_ON(signaling_thread()); // Check if a call to SetLocalDescription is acceptable with a session // description of the given type. bool ExpectSetLocalDescription(SdpType type); // Check if a call to SetRemoteDescription is acceptable with a session // description of the given type. bool ExpectSetRemoteDescription(SdpType type); // Verifies a=setup attribute as per RFC 5763. bool ValidateDtlsSetupAttribute(const cricket::SessionDescription* desc, SdpType type); // Returns true if we are ready to push down the remote candidate. // |remote_desc| is the new remote description, or NULL if the current remote // description should be used. Output |valid| is true if the candidate media // index is valid. bool ReadyToUseRemoteCandidate(const IceCandidateInterface* candidate, const SessionDescriptionInterface* remote_desc, bool* valid) RTC_RUN_ON(signaling_thread()); // Returns true if SRTP (either using DTLS-SRTP or SDES) is required by // this session. bool SrtpRequired() const RTC_RUN_ON(signaling_thread()); // JsepTransportController signal handlers. void OnTransportControllerConnectionState(cricket::IceConnectionState state) RTC_RUN_ON(signaling_thread()); void OnTransportControllerGatheringState(cricket::IceGatheringState state) RTC_RUN_ON(signaling_thread()); void OnTransportControllerCandidatesGathered( const std::string& transport_name, const std::vector& candidates) RTC_RUN_ON(signaling_thread()); void OnTransportControllerCandidateError( const cricket::IceCandidateErrorEvent& event) RTC_RUN_ON(signaling_thread()); void OnTransportControllerCandidatesRemoved( const std::vector& candidates) RTC_RUN_ON(signaling_thread()); void OnTransportControllerCandidateChanged( const cricket::CandidatePairChangeEvent& event) RTC_RUN_ON(signaling_thread()); void OnTransportControllerDtlsHandshakeError(rtc::SSLHandshakeError error); const char* SessionErrorToString(SessionError error) const; std::string GetSessionErrorMsg() RTC_RUN_ON(signaling_thread()); // Report the UMA metric SdpFormatReceived for the given remote offer. void ReportSdpFormatReceived(const SessionDescriptionInterface& remote_offer); // Report inferred negotiated SDP semantics from a local/remote answer to the // UMA observer. void ReportNegotiatedSdpSemantics(const SessionDescriptionInterface& answer); // Invoked when TransportController connection completion is signaled. // Reports stats for all transports in use. void ReportTransportStats() RTC_RUN_ON(signaling_thread()); // Gather the usage of IPv4/IPv6 as best connection. void ReportBestConnectionState(const cricket::TransportStats& stats); void ReportNegotiatedCiphers(const cricket::TransportStats& stats, const std::set& media_types) RTC_RUN_ON(signaling_thread()); void ReportIceCandidateCollected(const cricket::Candidate& candidate) RTC_RUN_ON(signaling_thread()); void ReportRemoteIceCandidateAdded(const cricket::Candidate& candidate) RTC_RUN_ON(signaling_thread()); void NoteUsageEvent(UsageEvent event); void ReportUsagePattern() const RTC_RUN_ON(signaling_thread()); void OnSentPacket_w(const rtc::SentPacket& sent_packet); const std::string GetTransportName(const std::string& content_name) RTC_RUN_ON(signaling_thread()); // Functions for dealing with transports. // Note that cricket code uses the term "channel" for what other code // refers to as "transport". // Destroys and clears the BaseChannel associated with the given transceiver, // if such channel is set. void DestroyTransceiverChannel( rtc::scoped_refptr> transceiver); // Destroys the RTP data channel transport and/or the SCTP data channel // transport and clears it. void DestroyDataChannelTransport() RTC_RUN_ON(signaling_thread()); // Destroys the given ChannelInterface. // The channel cannot be accessed after this method is called. void DestroyChannelInterface(cricket::ChannelInterface* channel); // JsepTransportController::Observer override. // // Called by |transport_controller_| when processing transport information // from a session description, and the mapping from m= sections to transports // changed (as a result of BUNDLE negotiation, or m= sections being // rejected). bool OnTransportChanged( const std::string& mid, RtpTransportInternal* rtp_transport, rtc::scoped_refptr dtls_transport, DataChannelTransportInterface* data_channel_transport) override; // RtpSenderBase::SetStreamsObserver override. void OnSetStreams() override; // Returns the CryptoOptions for this PeerConnection. This will always // return the RTCConfiguration.crypto_options if set and will only default // back to the PeerConnectionFactory settings if nothing was set. CryptoOptions GetCryptoOptions() RTC_RUN_ON(signaling_thread()); // Returns rtp transport, result can not be nullptr. RtpTransportInternal* GetRtpTransport(const std::string& mid) RTC_RUN_ON(signaling_thread()) { auto rtp_transport = transport_controller_->GetRtpTransport(mid); RTC_DCHECK(rtp_transport); return rtp_transport; } void UpdateNegotiationNeeded(); bool CheckIfNegotiationIsNeeded(); // | sdp_type | is the type of the SDP that caused the rollback. RTCError Rollback(SdpType sdp_type); // Storing the factory as a scoped reference pointer ensures that the memory // in the PeerConnectionFactoryImpl remains available as long as the // PeerConnection is running. It is passed to PeerConnection as a raw pointer. // However, since the reference counting is done in the // PeerConnectionFactoryInterface all instances created using the raw pointer // will refer to the same reference count. const rtc::scoped_refptr factory_; PeerConnectionObserver* observer_ RTC_GUARDED_BY(signaling_thread()) = nullptr; // The EventLog needs to outlive |call_| (and any other object that uses it). std::unique_ptr event_log_ RTC_GUARDED_BY(worker_thread()); // Points to the same thing as `event_log_`. Since it's const, we may read the // pointer (but not touch the object) from any thread. RtcEventLog* const event_log_ptr_ RTC_PT_GUARDED_BY(worker_thread()); // The operations chain is used by the offer/answer exchange methods to ensure // they are executed in the right order. For example, if // SetRemoteDescription() is invoked while CreateOffer() is still pending, the // SRD operation will not start until CreateOffer() has completed. See // https://w3c.github.io/webrtc-pc/#dfn-operations-chain. rtc::scoped_refptr operations_chain_ RTC_GUARDED_BY(signaling_thread()); SignalingState signaling_state_ RTC_GUARDED_BY(signaling_thread()) = kStable; IceConnectionState ice_connection_state_ RTC_GUARDED_BY(signaling_thread()) = kIceConnectionNew; PeerConnectionInterface::IceConnectionState standardized_ice_connection_state_ RTC_GUARDED_BY(signaling_thread()) = kIceConnectionNew; PeerConnectionInterface::PeerConnectionState connection_state_ RTC_GUARDED_BY(signaling_thread()) = PeerConnectionState::kNew; IceGatheringState ice_gathering_state_ RTC_GUARDED_BY(signaling_thread()) = kIceGatheringNew; PeerConnectionInterface::RTCConfiguration configuration_ RTC_GUARDED_BY(signaling_thread()); // TODO(zstein): |async_resolver_factory_| can currently be nullptr if it // is not injected. It should be required once chromium supplies it. std::unique_ptr async_resolver_factory_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr port_allocator_; // TODO(bugs.webrtc.org/9987): Accessed on both // signaling and network thread. std::unique_ptr packet_socket_factory_; std::unique_ptr ice_transport_factory_; // TODO(bugs.webrtc.org/9987): Accessed on the // signaling thread but the underlying raw // pointer is given to // |jsep_transport_controller_| and used on the // network thread. std::unique_ptr tls_cert_verifier_; // TODO(bugs.webrtc.org/9987): Accessed on both // signaling and network thread. // One PeerConnection has only one RTCP CNAME. // https://tools.ietf.org/html/draft-ietf-rtcweb-rtp-usage-26#section-4.9 const std::string rtcp_cname_; // Streams added via AddStream. const rtc::scoped_refptr local_streams_ RTC_GUARDED_BY(signaling_thread()); // Streams created as a result of SetRemoteDescription. const rtc::scoped_refptr remote_streams_ RTC_GUARDED_BY(signaling_thread()); std::vector> stream_observers_ RTC_GUARDED_BY(signaling_thread()); // These lists store sender info seen in local/remote descriptions. std::vector remote_audio_sender_infos_ RTC_GUARDED_BY(signaling_thread()); std::vector remote_video_sender_infos_ RTC_GUARDED_BY(signaling_thread()); std::vector local_audio_sender_infos_ RTC_GUARDED_BY(signaling_thread()); std::vector local_video_sender_infos_ RTC_GUARDED_BY(signaling_thread()); bool remote_peer_supports_msid_ RTC_GUARDED_BY(signaling_thread()) = false; // The unique_ptr belongs to the worker thread, but the Call object manages // its own thread safety. std::unique_ptr call_ RTC_GUARDED_BY(worker_thread()); rtc::AsyncInvoker rtcp_invoker_ RTC_GUARDED_BY(network_thread()); // Points to the same thing as `call_`. Since it's const, we may read the // pointer from any thread. Call* const call_ptr_; std::unique_ptr stats_ RTC_GUARDED_BY(signaling_thread()); // A pointer is passed to senders_ rtc::scoped_refptr stats_collector_ RTC_GUARDED_BY(signaling_thread()); // Holds changes made to transceivers during applying descriptors for // potential rollback. Gets cleared once signaling state goes to stable. std::map>, TransceiverStableState> transceiver_stable_states_by_transceivers_; // Used when rolling back RTP data channels. bool have_pending_rtp_data_channel_ RTC_GUARDED_BY(signaling_thread()) = false; // Holds remote stream ids for transceivers from stable state. std::map>, std::vector> remote_stream_ids_by_transceivers_; std::vector< rtc::scoped_refptr>> transceivers_; // TODO(bugs.webrtc.org/9987): Accessed on both signaling // and network thread. // In Unified Plan, if we encounter remote SDP that does not contain an a=msid // line we create and use a stream with a random ID for our receivers. This is // to support legacy endpoints that do not support the a=msid attribute (as // opposed to streamless tracks with "a=msid:-"). rtc::scoped_refptr missing_msid_default_stream_ RTC_GUARDED_BY(signaling_thread()); // MIDs will be generated using this generator which will keep track of // all the MIDs that have been seen over the life of the PeerConnection. rtc::UniqueStringGenerator mid_generator_ RTC_GUARDED_BY(signaling_thread()); SessionError session_error_ RTC_GUARDED_BY(signaling_thread()) = SessionError::kNone; std::string session_error_desc_ RTC_GUARDED_BY(signaling_thread()); std::string session_id_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr transport_controller_; // TODO(bugs.webrtc.org/9987): Accessed on both // signaling and network thread. std::unique_ptr sctp_factory_; // TODO(bugs.webrtc.org/9987): Accessed on both // signaling and network thread. // |sctp_mid_| is the content name (MID) in SDP. // Note: this is used as the data channel MID by both SCTP and data channel // transports. It is set when either transport is initialized and unset when // both transports are deleted. // There is one copy on the signaling thread and another copy on the // networking thread. Changes are always initiated from the signaling // thread, but applied first on the networking thread via an invoke(). absl::optional sctp_mid_s_ RTC_GUARDED_BY(signaling_thread()); absl::optional sctp_mid_n_ RTC_GUARDED_BY(network_thread()); // Whether this peer is the caller. Set when the local description is applied. absl::optional is_caller_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr current_local_description_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr pending_local_description_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr current_remote_description_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr pending_remote_description_ RTC_GUARDED_BY(signaling_thread()); bool dtls_enabled_ RTC_GUARDED_BY(signaling_thread()) = false; // List of content names for which the remote side triggered an ICE restart. std::set pending_ice_restarts_ RTC_GUARDED_BY(signaling_thread()); std::unique_ptr webrtc_session_desc_factory_ RTC_GUARDED_BY(signaling_thread()); // Member variables for caching global options. cricket::AudioOptions audio_options_ RTC_GUARDED_BY(signaling_thread()); cricket::VideoOptions video_options_ RTC_GUARDED_BY(signaling_thread()); int usage_event_accumulator_ RTC_GUARDED_BY(signaling_thread()) = 0; bool return_histogram_very_quickly_ RTC_GUARDED_BY(signaling_thread()) = false; // This object should be used to generate any SSRC that is not explicitly // specified by the user (or by the remote party). // The generator is not used directly, instead it is passed on to the // channel manager and the session description factory. rtc::UniqueRandomIdGenerator ssrc_generator_ RTC_GUARDED_BY(signaling_thread()); // A video bitrate allocator factory. // This can injected using the PeerConnectionDependencies, // or else the CreateBuiltinVideoBitrateAllocatorFactory() will be called. // Note that one can still choose to override this in a MediaEngine // if one wants too. std::unique_ptr video_bitrate_allocator_factory_; std::unique_ptr local_ice_credentials_to_replace_ RTC_GUARDED_BY(signaling_thread()); bool is_negotiation_needed_ RTC_GUARDED_BY(signaling_thread()) = false; DataChannelController data_channel_controller_; rtc::WeakPtrFactory weak_ptr_factory_ RTC_GUARDED_BY(signaling_thread()); }; } // namespace webrtc #endif // PC_PEER_CONNECTION_H_