MediaStream Recorder: Support VP9 encoder

content/renderer/media/video_track_recorder.h

 // Copyright 2015 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_VIDEO_TRACK_RECORDER_H_
 #define CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
@@ skipping 14 matching lines @@
 // Render thread but that pass frames on Render IO thread.
 class CONTENT_EXPORT VideoTrackRecorder
     : NON_EXPORTED_BASE(public MediaStreamVideoSink) {
  public:
   using OnEncodedVideoCB =
       base::Callback<void(const scoped_refptr<media::VideoFrame>& video_frame,
                           scoped_ptr<std::string> encoded_data,
                           base::TimeTicks capture_timestamp,
                           bool is_key_frame)>;
 
-  VideoTrackRecorder(const blink::WebMediaStreamTrack& track,
+  // |use_vp9| forces using VP9, otherwise VP8 will be used by default.
+  VideoTrackRecorder(bool use_vp9,
+                     const blink::WebMediaStreamTrack& track,
                      const OnEncodedVideoCB& on_encoded_video_cb);
   ~VideoTrackRecorder() override;
 
   void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,
                               base::TimeTicks capture_time);
 
  private:
   friend class VideoTrackRecorderTest;
 
   // Used to check that we are destroyed on the same thread we were created.
   base::ThreadChecker main_render_thread_checker_;
 
   // We need to hold on to the Blink track to remove ourselves on dtor.
   blink::WebMediaStreamTrack track_;
 
   // Forward declaration and member of an inner class to encode using VPx.
   class VpxEncoder;
   const scoped_refptr<VpxEncoder> encoder_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoTrackRecorder);
 };
 
 }  // namespace content
 #endif  // CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_