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