Adds MediaStreamSource, MediaStreamAudioSource and MediaStreamVideoCaptureDeviceSource

content/renderer/media/media_stream_video_source.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
-#include "content/renderer/media/media_stream_source_extra_data.h"
+#include "content/renderer/media/media_stream_dependency_factory.h"
+#include "content/renderer/media/media_stream_source.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 
 namespace media {
 class VideoFrame;
 }
 
 namespace content {
 
 class MediaStreamDependencyFactory;
 
 // MediaStreamVideoSource is an interface used for sending video frames to a
 // MediaStreamVideoTrack.
 // http://dev.w3.org/2011/webrtc/editor/getusermedia.html
 // All methods calls will be done from the main render thread.
 class CONTENT_EXPORT MediaStreamVideoSource
-    : public MediaStreamSourceExtraData {
+    : public MediaStreamSource,
+      NON_EXPORTED_BASE(public webrtc::ObserverInterface),
+      NON_EXPORTED_BASE(public base::NonThreadSafe) {
  public:
   explicit MediaStreamVideoSource(
       MediaStreamDependencyFactory* factory);
 
-  // Puts |track| in the registered tracks list. Will later
-  // deliver frames to it according to |constraints|.
+
+  // Puts |track| in the registered tracks list.
   virtual void AddTrack(const blink::WebMediaStreamTrack& track,
-                        const blink::WebMediaConstraints& constraints);
-
-  // Removes |track| from the registered tracks list, i.e. will stop delivering
-  // frame to |track|.
-  virtual void RemoveTrack(const blink::WebMediaStreamTrack& track);
+                        const blink::WebMediaConstraints& constraints,
+                        const ConstraintsCallback& callback) OVERRIDE;
+  virtual void RemoveTrack(const blink::WebMediaStreamTrack& track) OVERRIDE;
 
   // TODO(ronghuawu): Remove webrtc::VideoSourceInterface from the public
   // interface of this class.
   webrtc::VideoSourceInterface* GetAdapter() {
     return adapter_;
   }
 
  protected:
-  // Sets an external adapter. Must be called before Init, which creates a
-  // default adapter if the adapter is not set already.
+  virtual void DoStopSource() OVERRIDE {}
+
+  // Called when the first track is added to this source.
+  // It currently creates a webrtc::VideoSourceInterface.
+  // If a derived class overrides this method, it must call SetAdapter.
+  virtual void InitAdapter(const blink::WebMediaConstraints& constraints);
+
+  // Set the webrtc::VideoSourceInterface adapter used by this class.
+  // It must be called by a derived class that overrides the InitAdapter method.
   void SetAdapter(webrtc::VideoSourceInterface* adapter) {
     DCHECK(!adapter_);
     adapter_ = adapter;
   }
 
-  // Called by the derived class before any other methods except SetAdapter.
-  void Init();
+  MediaStreamDependencyFactory* factory() { return factory_; }
 
   // Sets ready state and notifies the ready state to all registered tracks.
   virtual void SetReadyState(blink::WebMediaStreamSource::ReadyState state);
 
   // Delivers |frame| to registered tracks according to their constraints.
   // Note: current implementation assumes |frame| be contiguous layout of image
   // planes and I420.
   virtual void DeliverVideoFrame(const scoped_refptr<media::VideoFrame>& frame);
 
+  // Implements webrtc::Observer.
+  virtual void OnChanged() OVERRIDE;
+
   virtual ~MediaStreamVideoSource();
 
  private:
+  // Checks if the underlying source state has changed from an initializing
+  // state to a final state and in that case trigger all callbacks in
+  // |constraints_callbacks_|.
+  void TriggerConstraintsCallbackOnStateChange();
+
+  bool initializing_;
   MediaStreamDependencyFactory* factory_;
   scoped_refptr<webrtc::VideoSourceInterface> adapter_;
   int width_;
   int height_;
   base::TimeDelta first_frame_timestamp_;
+
+  blink::WebMediaConstraints current_constraints_;
+  std::vector<ConstraintsCallback> constraints_callbacks_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_