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      1 /*
      2  * libjingle
      3  * Copyright 2012, Google Inc.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions are met:
      7  *
      8  *  1. Redistributions of source code must retain the above copyright notice,
      9  *     this list of conditions and the following disclaimer.
     10  *  2. Redistributions in binary form must reproduce the above copyright notice,
     11  *     this list of conditions and the following disclaimer in the documentation
     12  *     and/or other materials provided with the distribution.
     13  *  3. The name of the author may not be used to endorse or promote products
     14  *     derived from this software without specific prior written permission.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
     17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
     19  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     20  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     21  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     22  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     23  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     24  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     25  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #ifndef TALK_APP_WEBRTC_PEERCONNECTION_H_
     29 #define TALK_APP_WEBRTC_PEERCONNECTION_H_
     30 
     31 #include <string>
     32 
     33 #include "talk/app/webrtc/mediastreamsignaling.h"
     34 #include "talk/app/webrtc/peerconnectioninterface.h"
     35 #include "talk/app/webrtc/peerconnectionfactory.h"
     36 #include "talk/app/webrtc/statscollector.h"
     37 #include "talk/app/webrtc/streamcollection.h"
     38 #include "talk/app/webrtc/webrtcsession.h"
     39 #include "talk/base/scoped_ptr.h"
     40 
     41 namespace webrtc {
     42 class MediaStreamHandlerContainer;
     43 
     44 typedef std::vector<PortAllocatorFactoryInterface::StunConfiguration>
     45     StunConfigurations;
     46 typedef std::vector<PortAllocatorFactoryInterface::TurnConfiguration>
     47     TurnConfigurations;
     48 
     49 // PeerConnectionImpl implements the PeerConnection interface.
     50 // It uses MediaStreamSignaling and WebRtcSession to implement
     51 // the PeerConnection functionality.
     52 class PeerConnection : public PeerConnectionInterface,
     53                        public MediaStreamSignalingObserver,
     54                        public IceObserver,
     55                        public talk_base::MessageHandler,
     56                        public sigslot::has_slots<> {
     57  public:
     58   explicit PeerConnection(PeerConnectionFactory* factory);
     59 
     60   bool Initialize(const PeerConnectionInterface::IceServers& configuration,
     61                   const MediaConstraintsInterface* constraints,
     62                   PortAllocatorFactoryInterface* allocator_factory,
     63                   DTLSIdentityServiceInterface* dtls_identity_service,
     64                   PeerConnectionObserver* observer);
     65   virtual talk_base::scoped_refptr<StreamCollectionInterface> local_streams();
     66   virtual talk_base::scoped_refptr<StreamCollectionInterface> remote_streams();
     67   virtual bool AddStream(MediaStreamInterface* local_stream,
     68                          const MediaConstraintsInterface* constraints);
     69   virtual void RemoveStream(MediaStreamInterface* local_stream);
     70 
     71   virtual talk_base::scoped_refptr<DtmfSenderInterface> CreateDtmfSender(
     72       AudioTrackInterface* track);
     73 
     74   virtual talk_base::scoped_refptr<DataChannelInterface> CreateDataChannel(
     75       const std::string& label,
     76       const DataChannelInit* config);
     77   virtual bool GetStats(StatsObserver* observer,
     78                         webrtc::MediaStreamTrackInterface* track);
     79 
     80   virtual SignalingState signaling_state();
     81 
     82   // TODO(bemasc): Remove ice_state() when callers are removed.
     83   virtual IceState ice_state();
     84   virtual IceConnectionState ice_connection_state();
     85   virtual IceGatheringState ice_gathering_state();
     86 
     87   virtual const SessionDescriptionInterface* local_description() const;
     88   virtual const SessionDescriptionInterface* remote_description() const;
     89 
     90   // JSEP01
     91   virtual void CreateOffer(CreateSessionDescriptionObserver* observer,
     92                            const MediaConstraintsInterface* constraints);
     93   virtual void CreateAnswer(CreateSessionDescriptionObserver* observer,
     94                             const MediaConstraintsInterface* constraints);
     95   virtual void SetLocalDescription(SetSessionDescriptionObserver* observer,
     96                                    SessionDescriptionInterface* desc);
     97   virtual void SetRemoteDescription(SetSessionDescriptionObserver* observer,
     98                                     SessionDescriptionInterface* desc);
     99   virtual bool UpdateIce(const IceServers& configuration,
    100                          const MediaConstraintsInterface* constraints);
    101   virtual bool AddIceCandidate(const IceCandidateInterface* candidate);
    102 
    103   virtual void Close();
    104 
    105  protected:
    106   virtual ~PeerConnection();
    107 
    108  private:
    109   // Implements MessageHandler.
    110   virtual void OnMessage(talk_base::Message* msg);
    111 
    112   // Implements MediaStreamSignalingObserver.
    113   virtual void OnAddRemoteStream(MediaStreamInterface* stream) OVERRIDE;
    114   virtual void OnRemoveRemoteStream(MediaStreamInterface* stream) OVERRIDE;
    115   virtual void OnAddDataChannel(DataChannelInterface* data_channel) OVERRIDE;
    116   virtual void OnAddRemoteAudioTrack(MediaStreamInterface* stream,
    117                                      AudioTrackInterface* audio_track,
    118                                      uint32 ssrc) OVERRIDE;
    119   virtual void OnAddRemoteVideoTrack(MediaStreamInterface* stream,
    120                                      VideoTrackInterface* video_track,
    121                                      uint32 ssrc) OVERRIDE;
    122   virtual void OnRemoveRemoteAudioTrack(
    123       MediaStreamInterface* stream,
    124       AudioTrackInterface* audio_track) OVERRIDE;
    125   virtual void OnRemoveRemoteVideoTrack(
    126       MediaStreamInterface* stream,
    127       VideoTrackInterface* video_track) OVERRIDE;
    128   virtual void OnAddLocalAudioTrack(MediaStreamInterface* stream,
    129                                     AudioTrackInterface* audio_track,
    130                                     uint32 ssrc) OVERRIDE;
    131   virtual void OnAddLocalVideoTrack(MediaStreamInterface* stream,
    132                                     VideoTrackInterface* video_track,
    133                                     uint32 ssrc) OVERRIDE;
    134   virtual void OnRemoveLocalAudioTrack(
    135       MediaStreamInterface* stream,
    136       AudioTrackInterface* audio_track) OVERRIDE;
    137   virtual void OnRemoveLocalVideoTrack(
    138       MediaStreamInterface* stream,
    139       VideoTrackInterface* video_track) OVERRIDE;
    140   virtual void OnRemoveLocalStream(MediaStreamInterface* stream);
    141 
    142   // Implements IceObserver
    143   virtual void OnIceConnectionChange(IceConnectionState new_state);
    144   virtual void OnIceGatheringChange(IceGatheringState new_state);
    145   virtual void OnIceCandidate(const IceCandidateInterface* candidate);
    146   virtual void OnIceComplete();
    147 
    148   // Signals from WebRtcSession.
    149   void OnSessionStateChange(cricket::BaseSession* session,
    150                             cricket::BaseSession::State state);
    151   void ChangeSignalingState(SignalingState signaling_state);
    152 
    153   bool DoInitialize(const StunConfigurations& stun_config,
    154                     const TurnConfigurations& turn_config,
    155                     const MediaConstraintsInterface* constraints,
    156                     PortAllocatorFactoryInterface* allocator_factory,
    157                     DTLSIdentityServiceInterface* dtls_identity_service,
    158                     PeerConnectionObserver* observer);
    159 
    160   talk_base::Thread* signaling_thread() const {
    161     return factory_->signaling_thread();
    162   }
    163 
    164   void PostSetSessionDescriptionFailure(SetSessionDescriptionObserver* observer,
    165                                         const std::string& error);
    166 
    167   bool IsClosed() const {
    168     return signaling_state_ == PeerConnectionInterface::kClosed;
    169   }
    170 
    171   // Storing the factory as a scoped reference pointer ensures that the memory
    172   // in the PeerConnectionFactoryImpl remains available as long as the
    173   // PeerConnection is running. It is passed to PeerConnection as a raw pointer.
    174   // However, since the reference counting is done in the
    175   // PeerConnectionFactoryInteface all instances created using the raw pointer
    176   // will refer to the same reference count.
    177   talk_base::scoped_refptr<PeerConnectionFactory> factory_;
    178   PeerConnectionObserver* observer_;
    179   SignalingState signaling_state_;
    180   // TODO(bemasc): Remove ice_state_.
    181   IceState ice_state_;
    182   IceConnectionState ice_connection_state_;
    183   IceGatheringState ice_gathering_state_;
    184 
    185   talk_base::scoped_ptr<cricket::PortAllocator> port_allocator_;
    186   talk_base::scoped_ptr<WebRtcSession> session_;
    187   talk_base::scoped_ptr<MediaStreamSignaling> mediastream_signaling_;
    188   talk_base::scoped_ptr<MediaStreamHandlerContainer> stream_handler_container_;
    189   StatsCollector stats_;
    190 };
    191 
    192 }  // namespace webrtc
    193 
    194 #endif  // TALK_APP_WEBRTC_PEERCONNECTION_H_
    195