MediaStream audio: Refactor 3 separate "glue" implementations into one.

content/renderer/pepper/pepper_media_stream_video_track_host.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_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
 #define CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_
 
 #include <stdint.h>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "content/public/common/media_stream_request.h"
 #include "content/public/renderer/media_stream_video_sink.h"
-#include "content/renderer/media/media_stream_video_source.h"
 #include "content/renderer/pepper/pepper_media_stream_track_host_base.h"
 #include "media/base/video_frame.h"
 #include "ppapi/c/ppb_video_frame.h"
 #include "ppapi/shared_impl/media_stream_video_track_shared.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace content {
 
+class MediaStreamSource;
+
 class PepperMediaStreamVideoTrackHost : public PepperMediaStreamTrackHostBase,
-                                        public MediaStreamVideoSink,
-                                        public MediaStreamVideoSource {
+                                        public MediaStreamVideoSink {
  public:
   // Input mode constructor.
   // In input mode, this class passes video frames from |track| to the
   // associated pepper plugin.
   PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
                                   PP_Instance instance,
                                   PP_Resource resource,
                                   const blink::WebMediaStreamTrack& track);
 
   // Output mode constructor.
   // In output mode, this class passes video frames from the associated
   // pepper plugin to a newly created blink::WebMediaStreamTrack.
   PepperMediaStreamVideoTrackHost(RendererPpapiHost* host,
                                   PP_Instance instance,
                                   PP_Resource resource);
 
   ~PepperMediaStreamVideoTrackHost() override;
 
   bool IsMediaStreamVideoTrackHost() override;
 
   blink::WebMediaStreamTrack track() { return track_; }
 
  private:
+  // Implements a MediaStreamVideoSource that drives this host (output mode
+  // only). VideoSource holds a weak reference to the host, and sets/clears
+  // |frame_deliverer_|.
+  class VideoSource;
+
   void InitBuffers();
 
   // PepperMediaStreamTrackHostBase overrides:
   void OnClose() override;
   int32_t OnHostMsgEnqueueBuffer(ppapi::host::HostMessageContext* context,
                                  int32_t index) override;
 
   // Sends frame with |index| to |track_|.
   int32_t SendFrameToTrack(int32_t index);
 
   void OnVideoFrame(const scoped_refptr<media::VideoFrame>& frame,
                     base::TimeTicks estimated_capture_time);
 
-  // MediaStreamVideoSource overrides:
-  void GetCurrentSupportedFormats(
-      int max_requested_width,
-      int max_requested_height,
-      double max_requested_frame_rate,
-      const VideoCaptureDeviceFormatsCB& callback) override;
-
-  void StartSourceImpl(
-      const media::VideoCaptureFormat& format,
-      const blink::WebMediaConstraints& constraints,
-      const VideoCaptureDeliverFrameCB& frame_callback) override;
-
-  void StopSourceImpl() override;
-
   // ResourceHost overrides:
   void DidConnectPendingHostToResource() override;
 
   // ResourceMessageHandler overrides:
   int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) override;
 
   // Message handlers:
   int32_t OnHostMsgConfigure(
@@ skipping 21 matching lines @@
 
   // Plugin specified frame format.
   PP_VideoFrame_Format plugin_frame_format_;
 
   // The size of frame pixels in bytes.
   uint32_t frame_data_size_;
 
   // TODO(ronghuawu): Remove |type_| and split PepperMediaStreamVideoTrackHost
   // into 2 classes for read and write.
   TrackType type_;
-  bool output_started_;
 
   // Internal class used for delivering video frames on the IO-thread to
   // the MediaStreamVideoSource implementation.
   class FrameDeliverer;
   scoped_refptr<FrameDeliverer> frame_deliverer_;
 
   base::WeakPtrFactory<PepperMediaStreamVideoTrackHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperMediaStreamVideoTrackHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_PEPPER_MEDIA_STREAM_VIDEO_TRACK_HOST_H_