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