Implement a source for remote video tracks.

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 <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 46 matching lines @@
   // Puts |track| in the registered tracks list.
   void AddTrack(MediaStreamVideoTrack* track,
                 const blink::WebMediaConstraints& constraints,
                 const ConstraintsCallback& callback);
   void RemoveTrack(MediaStreamVideoTrack* track);
 
   // TODO(ronghuawu): Remove webrtc::VideoSourceInterface from the public
   // interface of this class.
   // This creates a VideoSourceInterface implementation if it does not already
   // exist.
-  webrtc::VideoSourceInterface* GetAdapter();
+  virtual webrtc::VideoSourceInterface* GetAdapter();
 
   // Constraint keys used by a video source.
   // Specified by draft-alvestrand-constraints-resolution-00b
   static const char kMinAspectRatio[];  // minAspectRatio
   static const char kMaxAspectRatio[];  // maxAspectRatio
   static const char kMaxWidth[];  // maxWidth
   static const char kMinWidth[];  // minWidthOnCaptureFormats
   static const char kMaxHeight[];  // maxHeight
   static const char kMinHeight[];  // minHeight
   static const char kMaxFrameRate[];  // maxFrameRate
@@ skipping 33 matching lines @@
   // OnStartDone must be called. An implementation must call
   // DeliverVideoFrame with the captured frames.
   virtual void StartSourceImpl(const media::VideoCaptureParams& params) = 0;
   void OnStartDone(bool success);
 
   // An implementation must immediately stop capture video frames and must not
   // call OnSupportedFormats after this method has been called. After this
   // method has been called, MediaStreamVideoSource may be deleted.
   virtual void StopSourceImpl() = 0;
 
+  enum State {
+      NEW,
+      RETRIEVING_CAPABILITIES,
+      STARTING,
+      STARTED,
+      ENDED
+  };
+  State GetState() const { return state_; }

[Jói, 2014/03/17 22:00:40]

Our naming conventions would typically name this method state() since it is a
simple getter.

[perkj_chrome, 2014/03/19 16:34:48]

Done.

+
  private:
   // Creates a webrtc::VideoSourceInterface used by libjingle.
   void InitAdapter();
 
   // Finds the first constraints in |requested_constraints_| that can be
   // fulfilled. |best_format| is set to the video resolution that can be
   // fulfilled. |frame_output_size| is the requested frame size after cropping.
   // |resulting_constraints| is set to the found constraints in
   // |requested_constraints_|.
   bool FindBestFormatWithConstraints(
       const media::VideoCaptureFormats& formats,
       media::VideoCaptureFormat* best_format,
       gfx::Size* frame_output_size,
       blink::WebMediaConstraints* resulting_constraints);
 
   // Trigger all cached callbacks from AddTrack. AddTrack is successful
   // if the capture delegate has started and the constraints provided in
   // AddTrack match the format that was used to start the device.
   void FinalizeAddTrack();
 
-  enum State {
-    NEW,
-    RETRIEVING_CAPABILITIES,
-    STARTING,
-    STARTED,
-    ENDED
-  };
   State state_;
 
   media::VideoCaptureFormat current_format_;
   blink::WebMediaConstraints current_constraints_;
   gfx::Size frame_output_size_;
 
   struct RequestedConstraints {
     RequestedConstraints(const blink::WebMediaConstraints& constraints,
                          const ConstraintsCallback& callback);
     ~RequestedConstraints();
@@ skipping 13 matching lines @@
   MediaStreamDependencyFactory* factory_;
   scoped_refptr<webrtc::VideoSourceInterface> adapter_;
   WebRtcVideoCapturerAdapter* capture_adapter_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoSource);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_VIDEO_SOURCE_H_