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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(
     61       const PeerConnectionInterface::RTCConfiguration& configuration,
     62       const MediaConstraintsInterface* constraints,
     63       PortAllocatorFactoryInterface* allocator_factory,
     64       DTLSIdentityServiceInterface* dtls_identity_service,
     65       PeerConnectionObserver* observer);
     66   virtual talk_base::scoped_refptr<StreamCollectionInterface> local_streams();
     67   virtual talk_base::scoped_refptr<StreamCollectionInterface> remote_streams();
     68   virtual bool AddStream(MediaStreamInterface* local_stream,
     69                          const MediaConstraintsInterface* constraints);
     70   virtual void RemoveStream(MediaStreamInterface* local_stream);
     71 
     72   virtual talk_base::scoped_refptr<DtmfSenderInterface> CreateDtmfSender(
     73       AudioTrackInterface* track);
     74 
     75   virtual talk_base::scoped_refptr<DataChannelInterface> CreateDataChannel(
     76       const std::string& label,
     77       const DataChannelInit* config);
     78   virtual bool GetStats(StatsObserver* observer,
     79                         webrtc::MediaStreamTrackInterface* track,
     80                         StatsOutputLevel level);
     81 
     82   virtual SignalingState signaling_state();
     83 
     84   // TODO(bemasc): Remove ice_state() when callers are removed.
     85   virtual IceState ice_state();
     86   virtual IceConnectionState ice_connection_state();
     87   virtual IceGatheringState ice_gathering_state();
     88 
     89   virtual const SessionDescriptionInterface* local_description() const;
     90   virtual const SessionDescriptionInterface* remote_description() const;
     91 
     92   // JSEP01
     93   virtual void CreateOffer(CreateSessionDescriptionObserver* observer,
     94                            const MediaConstraintsInterface* constraints);
     95   virtual void CreateAnswer(CreateSessionDescriptionObserver* observer,
     96                             const MediaConstraintsInterface* constraints);
     97   virtual void SetLocalDescription(SetSessionDescriptionObserver* observer,
     98                                    SessionDescriptionInterface* desc);
     99   virtual void SetRemoteDescription(SetSessionDescriptionObserver* observer,
    100                                     SessionDescriptionInterface* desc);
    101   // TODO(mallinath) : Deprecated version, remove after all clients are updated.
    102   virtual bool UpdateIce(const IceServers& configuration,
    103                          const MediaConstraintsInterface* constraints);
    104   virtual bool UpdateIce(
    105       const PeerConnectionInterface::RTCConfiguration& config);
    106   virtual bool AddIceCandidate(const IceCandidateInterface* candidate);
    107 
    108   virtual void RegisterUMAObserver(UMAObserver* observer);
    109 
    110   virtual void Close();
    111 
    112  protected:
    113   virtual ~PeerConnection();
    114 
    115  private:
    116   // Implements MessageHandler.
    117   virtual void OnMessage(talk_base::Message* msg);
    118 
    119   // Implements MediaStreamSignalingObserver.
    120   virtual void OnAddRemoteStream(MediaStreamInterface* stream) OVERRIDE;
    121   virtual void OnRemoveRemoteStream(MediaStreamInterface* stream) OVERRIDE;
    122   virtual void OnAddDataChannel(DataChannelInterface* data_channel) OVERRIDE;
    123   virtual void OnAddRemoteAudioTrack(MediaStreamInterface* stream,
    124                                      AudioTrackInterface* audio_track,
    125                                      uint32 ssrc) OVERRIDE;
    126   virtual void OnAddRemoteVideoTrack(MediaStreamInterface* stream,
    127                                      VideoTrackInterface* video_track,
    128                                      uint32 ssrc) OVERRIDE;
    129   virtual void OnRemoveRemoteAudioTrack(
    130       MediaStreamInterface* stream,
    131       AudioTrackInterface* audio_track) OVERRIDE;
    132   virtual void OnRemoveRemoteVideoTrack(
    133       MediaStreamInterface* stream,
    134       VideoTrackInterface* video_track) OVERRIDE;
    135   virtual void OnAddLocalAudioTrack(MediaStreamInterface* stream,
    136                                     AudioTrackInterface* audio_track,
    137                                     uint32 ssrc) OVERRIDE;
    138   virtual void OnAddLocalVideoTrack(MediaStreamInterface* stream,
    139                                     VideoTrackInterface* video_track,
    140                                     uint32 ssrc) OVERRIDE;
    141   virtual void OnRemoveLocalAudioTrack(
    142       MediaStreamInterface* stream,
    143       AudioTrackInterface* audio_track,
    144       uint32 ssrc) OVERRIDE;
    145   virtual void OnRemoveLocalVideoTrack(
    146       MediaStreamInterface* stream,
    147       VideoTrackInterface* video_track) OVERRIDE;
    148   virtual void OnRemoveLocalStream(MediaStreamInterface* stream);
    149 
    150   // Implements IceObserver
    151   virtual void OnIceConnectionChange(IceConnectionState new_state);
    152   virtual void OnIceGatheringChange(IceGatheringState new_state);
    153   virtual void OnIceCandidate(const IceCandidateInterface* candidate);
    154   virtual void OnIceComplete();
    155 
    156   // Signals from WebRtcSession.
    157   void OnSessionStateChange(cricket::BaseSession* session,
    158                             cricket::BaseSession::State state);
    159   void ChangeSignalingState(SignalingState signaling_state);
    160 
    161   bool DoInitialize(IceTransportsType type,
    162                     const StunConfigurations& stun_config,
    163                     const TurnConfigurations& turn_config,
    164                     const MediaConstraintsInterface* constraints,
    165                     PortAllocatorFactoryInterface* allocator_factory,
    166                     DTLSIdentityServiceInterface* dtls_identity_service,
    167                     PeerConnectionObserver* observer);
    168 
    169   talk_base::Thread* signaling_thread() const {
    170     return factory_->signaling_thread();
    171   }
    172 
    173   void PostSetSessionDescriptionFailure(SetSessionDescriptionObserver* observer,
    174                                         const std::string& error);
    175 
    176   bool IsClosed() const {
    177     return signaling_state_ == PeerConnectionInterface::kClosed;
    178   }
    179 
    180   // Storing the factory as a scoped reference pointer ensures that the memory
    181   // in the PeerConnectionFactoryImpl remains available as long as the
    182   // PeerConnection is running. It is passed to PeerConnection as a raw pointer.
    183   // However, since the reference counting is done in the
    184   // PeerConnectionFactoryInteface all instances created using the raw pointer
    185   // will refer to the same reference count.
    186   talk_base::scoped_refptr<PeerConnectionFactory> factory_;
    187   PeerConnectionObserver* observer_;
    188   UMAObserver* uma_observer_;
    189   SignalingState signaling_state_;
    190   // TODO(bemasc): Remove ice_state_.
    191   IceState ice_state_;
    192   IceConnectionState ice_connection_state_;
    193   IceGatheringState ice_gathering_state_;
    194 
    195   talk_base::scoped_ptr<cricket::PortAllocator> port_allocator_;
    196   talk_base::scoped_ptr<WebRtcSession> session_;
    197   talk_base::scoped_ptr<MediaStreamSignaling> mediastream_signaling_;
    198   talk_base::scoped_ptr<MediaStreamHandlerContainer> stream_handler_container_;
    199   StatsCollector stats_;
    200 };
    201 
    202 }  // namespace webrtc
    203 
    204 #endif  // TALK_APP_WEBRTC_PEERCONNECTION_H_
    205