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28 #ifndef TALK_APP_WEBRTC_WEBRTCSESSION_H_
29 #define TALK_APP_WEBRTC_WEBRTCSESSION_H_
33 #include "talk/app/webrtc/peerconnectioninterface.h"
34 #include "talk/app/webrtc/dtmfsender.h"
35 #include "talk/app/webrtc/mediastreamprovider.h"
36 #include "talk/app/webrtc/datachannel.h"
37 #include "talk/app/webrtc/statstypes.h"
38 #include "talk/base/sigslot.h"
39 #include "talk/base/thread.h"
40 #include "talk/media/base/mediachannel.h"
41 #include "talk/p2p/base/session.h"
42 #include "talk/session/media/mediasession.h"
55 } // namespace cricket
58 class IceRestartAnswerLatch;
59 class MediaStreamSignaling;
60 class WebRtcSessionDescriptionFactory;
62 extern const char kBundleWithoutRtcpMux[];
63 extern const char kCreateChannelFailed[];
64 extern const char kInvalidCandidates[];
65 extern const char kInvalidSdp[];
66 extern const char kMlineMismatch[];
67 extern const char kPushDownTDFailed[];
68 extern const char kSdpWithoutDtlsFingerprint[];
69 extern const char kSdpWithoutSdesCrypto[];
70 extern const char kSdpWithoutIceUfragPwd[];
71 extern const char kSdpWithoutSdesAndDtlsDisabled[];
72 extern const char kSessionError[];
73 extern const char kSessionErrorDesc[];
75 // ICE state callback interface.
79 // Called any time the IceConnectionState changes
80 virtual void OnIceConnectionChange(
81 PeerConnectionInterface::IceConnectionState new_state) {}
82 // Called any time the IceGatheringState changes
83 virtual void OnIceGatheringChange(
84 PeerConnectionInterface::IceGatheringState new_state) {}
85 // New Ice candidate have been found.
86 virtual void OnIceCandidate(const IceCandidateInterface* candidate) = 0;
87 // All Ice candidates have been found.
88 // TODO(bemasc): Remove this once callers transition to OnIceGatheringChange.
89 // (via PeerConnectionObserver)
90 virtual void OnIceComplete() {}
96 DISALLOW_COPY_AND_ASSIGN(IceObserver);
99 class WebRtcSession : public cricket::BaseSession,
100 public AudioProviderInterface,
101 public DataChannelFactory,
102 public VideoProviderInterface,
103 public DtmfProviderInterface,
104 public DataChannelProviderInterface {
106 WebRtcSession(cricket::ChannelManager* channel_manager,
107 talk_base::Thread* signaling_thread,
108 talk_base::Thread* worker_thread,
109 cricket::PortAllocator* port_allocator,
110 MediaStreamSignaling* mediastream_signaling);
111 virtual ~WebRtcSession();
113 bool Initialize(const PeerConnectionFactoryInterface::Options& options,
114 const MediaConstraintsInterface* constraints,
115 DTLSIdentityServiceInterface* dtls_identity_service);
116 // Deletes the voice, video and data channel and changes the session state
117 // to STATE_RECEIVEDTERMINATE.
120 void RegisterIceObserver(IceObserver* observer) {
121 ice_observer_ = observer;
124 virtual cricket::VoiceChannel* voice_channel() {
125 return voice_channel_.get();
127 virtual cricket::VideoChannel* video_channel() {
128 return video_channel_.get();
130 virtual cricket::DataChannel* data_channel() {
131 return data_channel_.get();
134 void SetSdesPolicy(cricket::SecurePolicy secure_policy);
135 cricket::SecurePolicy SdesPolicy() const;
137 // Get current ssl role from transport.
138 bool GetSslRole(talk_base::SSLRole* role);
140 // Generic error message callback from WebRtcSession.
141 // TODO - It may be necessary to supply error code as well.
142 sigslot::signal0<> SignalError;
144 void CreateOffer(CreateSessionDescriptionObserver* observer,
145 const MediaConstraintsInterface* constraints);
146 void CreateAnswer(CreateSessionDescriptionObserver* observer,
147 const MediaConstraintsInterface* constraints);
148 // The ownership of |desc| will be transferred after this call.
149 bool SetLocalDescription(SessionDescriptionInterface* desc,
150 std::string* err_desc);
151 // The ownership of |desc| will be transferred after this call.
152 bool SetRemoteDescription(SessionDescriptionInterface* desc,
153 std::string* err_desc);
154 bool ProcessIceMessage(const IceCandidateInterface* ice_candidate);
155 const SessionDescriptionInterface* local_description() const {
156 return local_desc_.get();
158 const SessionDescriptionInterface* remote_description() const {
159 return remote_desc_.get();
162 // Get the id used as a media stream track's "id" field from ssrc.
163 virtual bool GetTrackIdBySsrc(uint32 ssrc, std::string* id);
165 // AudioMediaProviderInterface implementation.
166 virtual void SetAudioPlayout(uint32 ssrc, bool enable,
167 cricket::AudioRenderer* renderer) OVERRIDE;
168 virtual void SetAudioSend(uint32 ssrc, bool enable,
169 const cricket::AudioOptions& options,
170 cricket::AudioRenderer* renderer) OVERRIDE;
171 virtual void SetAudioPlayoutVolume(uint32 ssrc, double volume) OVERRIDE;
173 // Implements VideoMediaProviderInterface.
174 virtual bool SetCaptureDevice(uint32 ssrc,
175 cricket::VideoCapturer* camera) OVERRIDE;
176 virtual void SetVideoPlayout(uint32 ssrc,
178 cricket::VideoRenderer* renderer) OVERRIDE;
179 virtual void SetVideoSend(uint32 ssrc, bool enable,
180 const cricket::VideoOptions* options) OVERRIDE;
182 // Implements DtmfProviderInterface.
183 virtual bool CanInsertDtmf(const std::string& track_id);
184 virtual bool InsertDtmf(const std::string& track_id,
185 int code, int duration);
186 virtual sigslot::signal0<>* GetOnDestroyedSignal();
188 // Implements DataChannelProviderInterface.
189 virtual bool SendData(const cricket::SendDataParams& params,
190 const talk_base::Buffer& payload,
191 cricket::SendDataResult* result) OVERRIDE;
192 virtual bool ConnectDataChannel(DataChannel* webrtc_data_channel) OVERRIDE;
193 virtual void DisconnectDataChannel(DataChannel* webrtc_data_channel) OVERRIDE;
194 virtual void AddSctpDataStream(uint32 sid) OVERRIDE;
195 virtual void RemoveSctpDataStream(uint32 sid) OVERRIDE;
196 virtual bool ReadyToSendData() const OVERRIDE;
198 // Implements DataChannelFactory.
199 talk_base::scoped_refptr<DataChannel> CreateDataChannel(
200 const std::string& label,
201 const InternalDataChannelInit* config) OVERRIDE;
203 cricket::DataChannelType data_channel_type() const;
205 bool IceRestartPending() const;
207 void ResetIceRestartLatch();
209 // Called when an SSLIdentity is generated or retrieved by
210 // WebRTCSessionDescriptionFactory. Should happen before setLocalDescription.
211 void OnIdentityReady(talk_base::SSLIdentity* identity);
214 bool waiting_for_identity() const;
217 // Indicates the type of SessionDescription in a call to SetLocalDescription
218 // and SetRemoteDescription.
225 // Invokes ConnectChannels() on transport proxies, which initiates ice
226 // candidates allocation.
227 bool StartCandidatesAllocation();
228 bool UpdateSessionState(Action action, cricket::ContentSource source,
229 std::string* err_desc);
230 static Action GetAction(const std::string& type);
232 // Transport related callbacks, override from cricket::BaseSession.
233 virtual void OnTransportRequestSignaling(cricket::Transport* transport);
234 virtual void OnTransportConnecting(cricket::Transport* transport);
235 virtual void OnTransportWritable(cricket::Transport* transport);
236 virtual void OnTransportCompleted(cricket::Transport* transport);
237 virtual void OnTransportFailed(cricket::Transport* transport);
238 virtual void OnTransportProxyCandidatesReady(
239 cricket::TransportProxy* proxy,
240 const cricket::Candidates& candidates);
241 virtual void OnCandidatesAllocationDone();
243 // Creates local session description with audio and video contents.
244 bool CreateDefaultLocalDescription();
245 // Enables media channels to allow sending of media.
246 void EnableChannels();
247 // Creates a JsepIceCandidate and adds it to the local session description
248 // and notify observers. Called when a new local candidate have been found.
249 void ProcessNewLocalCandidate(const std::string& content_name,
250 const cricket::Candidates& candidates);
251 // Returns the media index for a local ice candidate given the content name.
252 // Returns false if the local session description does not have a media
253 // content called |content_name|.
254 bool GetLocalCandidateMediaIndex(const std::string& content_name,
255 int* sdp_mline_index);
256 // Uses all remote candidates in |remote_desc| in this session.
257 bool UseCandidatesInSessionDescription(
258 const SessionDescriptionInterface* remote_desc);
259 // Uses |candidate| in this session.
260 bool UseCandidate(const IceCandidateInterface* candidate);
261 // Deletes the corresponding channel of contents that don't exist in |desc|.
262 // |desc| can be null. This means that all channels are deleted.
263 void RemoveUnusedChannelsAndTransports(
264 const cricket::SessionDescription* desc);
266 // Allocates media channels based on the |desc|. If |desc| doesn't have
267 // the BUNDLE option, this method will disable BUNDLE in PortAllocator.
268 // This method will also delete any existing media channels before creating.
269 bool CreateChannels(const cricket::SessionDescription* desc);
271 // Helper methods to create media channels.
272 bool CreateVoiceChannel(const cricket::ContentInfo* content);
273 bool CreateVideoChannel(const cricket::ContentInfo* content);
274 bool CreateDataChannel(const cricket::ContentInfo* content);
276 // Copy the candidates from |saved_candidates_| to |dest_desc|.
277 // The |saved_candidates_| will be cleared after this function call.
278 void CopySavedCandidates(SessionDescriptionInterface* dest_desc);
280 // Listens to SCTP CONTROL messages on unused SIDs and process them as OPEN
282 void OnDataChannelMessageReceived(cricket::DataChannel* channel,
283 const cricket::ReceiveDataParams& params,
284 const talk_base::Buffer& payload);
286 bool GetLocalTrackId(uint32 ssrc, std::string* track_id);
287 bool GetRemoteTrackId(uint32 ssrc, std::string* track_id);
289 std::string BadStateErrMsg(State state);
290 void SetIceConnectionState(PeerConnectionInterface::IceConnectionState state);
292 bool ValidateBundleSettings(const cricket::SessionDescription* desc);
293 bool HasRtcpMuxEnabled(const cricket::ContentInfo* content);
294 // Below methods are helper methods which verifies SDP.
295 bool ValidateSessionDescription(const SessionDescriptionInterface* sdesc,
296 cricket::ContentSource source,
297 std::string* err_desc);
299 // Check if a call to SetLocalDescription is acceptable with |action|.
300 bool ExpectSetLocalDescription(Action action);
301 // Check if a call to SetRemoteDescription is acceptable with |action|.
302 bool ExpectSetRemoteDescription(Action action);
303 // Verifies a=setup attribute as per RFC 5763.
304 bool ValidateDtlsSetupAttribute(const cricket::SessionDescription* desc,
307 std::string GetSessionErrorMsg();
309 talk_base::scoped_ptr<cricket::VoiceChannel> voice_channel_;
310 talk_base::scoped_ptr<cricket::VideoChannel> video_channel_;
311 talk_base::scoped_ptr<cricket::DataChannel> data_channel_;
312 cricket::ChannelManager* channel_manager_;
313 MediaStreamSignaling* mediastream_signaling_;
314 IceObserver* ice_observer_;
315 PeerConnectionInterface::IceConnectionState ice_connection_state_;
316 talk_base::scoped_ptr<SessionDescriptionInterface> local_desc_;
317 talk_base::scoped_ptr<SessionDescriptionInterface> remote_desc_;
318 // Candidates that arrived before the remote description was set.
319 std::vector<IceCandidateInterface*> saved_candidates_;
320 // If the remote peer is using a older version of implementation.
321 bool older_version_remote_peer_;
323 // Specifies which kind of data channel is allowed. This is controlled
324 // by the chrome command-line flag and constraints:
325 // 1. If chrome command-line switch 'enable-sctp-data-channels' is enabled,
326 // constraint kEnableDtlsSrtp is true, and constaint kEnableRtpDataChannels is
327 // not set or false, SCTP is allowed (DCT_SCTP);
328 // 2. If constraint kEnableRtpDataChannels is true, RTP is allowed (DCT_RTP);
329 // 3. If both 1&2 are false, data channel is not allowed (DCT_NONE).
330 cricket::DataChannelType data_channel_type_;
331 talk_base::scoped_ptr<IceRestartAnswerLatch> ice_restart_latch_;
333 talk_base::scoped_ptr<WebRtcSessionDescriptionFactory>
334 webrtc_session_desc_factory_;
336 sigslot::signal0<> SignalVoiceChannelDestroyed;
337 sigslot::signal0<> SignalVideoChannelDestroyed;
338 sigslot::signal0<> SignalDataChannelDestroyed;
340 // Member variables for caching global options.
341 cricket::AudioOptions audio_options_;
342 cricket::VideoOptions video_options_;
344 DISALLOW_COPY_AND_ASSIGN(WebRtcSession);
346 } // namespace webrtc
348 #endif // TALK_APP_WEBRTC_WEBRTCSESSION_H_