src/content/renderer/media/remote_media_stream_impl.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_MEDIA_REMOTE_MEDIA_STREAM_IMPL_H_
   6 #define CONTENT_RENDERER_MEDIA_REMOTE_MEDIA_STREAM_IMPL_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "base/single_thread_task_runner.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "content/common/content_export.h"
  16 #include "third_party/libjingle/source/talk/app/webrtc/mediastreaminterface.h"
  17 #include "third_party/WebKit/public/platform/WebMediaStream.h"
  18 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
  19 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
  20
  21 namespace content {
  22
  23 class RemoteAudioTrackAdapter;
  24 class RemoteVideoTrackAdapter;
  25
  26 // RemoteMediaStreamImpl serves as a container and glue between remote webrtc
  27 // MediaStreams and WebKit MediaStreams. For each remote MediaStream received
  28 // on a PeerConnection a RemoteMediaStreamImpl instance is created and
  29 // owned by RtcPeerConnection.
  30 class CONTENT_EXPORT RemoteMediaStreamImpl {
  31  public:
  32   RemoteMediaStreamImpl(
  33       const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
  34       webrtc::MediaStreamInterface* webrtc_stream);
  35   ~RemoteMediaStreamImpl();
  36
  37   const blink::WebMediaStream& webkit_stream() { return webkit_stream_; }
  38   const scoped_refptr<webrtc::MediaStreamInterface>& webrtc_stream() {
  39     return observer_->stream();
  40   }
  41
  42  private:
  43   typedef std::vector<scoped_refptr<RemoteAudioTrackAdapter>>
  44       RemoteAudioTrackAdapters;
  45   typedef std::vector<scoped_refptr<RemoteVideoTrackAdapter>>
  46       RemoteVideoTrackAdapters;
  47
  48   void InitializeOnMainThread(const std::string& label);
  49
  50   class Observer
  51       : NON_EXPORTED_BASE(public webrtc::ObserverInterface),
  52         public base::RefCountedThreadSafe<Observer> {
  53    public:
  54     Observer(const base::WeakPtr<RemoteMediaStreamImpl>& media_stream,
  55              const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
  56              webrtc::MediaStreamInterface* webrtc_stream);
  57
  58     const scoped_refptr<webrtc::MediaStreamInterface>& stream() const {
  59       return webrtc_stream_;
  60     }
  61
  62     const scoped_refptr<base::SingleThreadTaskRunner>& main_thread() const {
  63       return main_thread_;
  64     }
  65
  66     void InitializeOnMainThread(const std::string& label);
  67
  68     // Uninitializes the observer, unregisteres from receiving notifications
  69     // and releases the webrtc stream.
  70     // Note: Must be called from the main thread before releasing the main
  71     // reference.
  72     void Unregister();
  73
  74    private:
  75     friend class base::RefCountedThreadSafe<Observer>;
  76     ~Observer() override;
  77
  78     // webrtc::ObserverInterface implementation.
  79     void OnChanged() override;
  80
  81     void OnChangedOnMainThread(
  82         scoped_ptr<RemoteAudioTrackAdapters> audio_tracks,
  83         scoped_ptr<RemoteVideoTrackAdapters> video_tracks);
  84
  85     base::WeakPtr<RemoteMediaStreamImpl> media_stream_;
  86     const scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
  87     scoped_refptr<webrtc::MediaStreamInterface> webrtc_stream_;
  88   };
  89
  90   void OnChanged(scoped_ptr<RemoteAudioTrackAdapters> audio_tracks,
  91                  scoped_ptr<RemoteVideoTrackAdapters> video_tracks);
  92
  93   const scoped_refptr<base::SingleThreadTaskRunner> signaling_thread_;
  94   base::WeakPtrFactory<RemoteMediaStreamImpl> weak_factory_;
  95   const scoped_refptr<Observer> observer_;  // must be after weak_factory_
  96
  97   RemoteVideoTrackAdapters video_track_observers_;
  98   RemoteAudioTrackAdapters audio_track_observers_;
  99   blink::WebMediaStream webkit_stream_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(RemoteMediaStreamImpl);
 102 };
 103
 104 }  // namespace content
 105
 106 #endif  // CONTENT_RENDERER_MEDIA_REMOTE_MEDIA_STREAM_IMPL_H_