[Experimental] MediaStreamRecorder playground

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"
+#include "content/public/renderer/media_stream_video_sink.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace content {
+
+class VideoTrackRecorder final : public MediaStreamVideoSink {
+ public:
+  typedef base::Callback<void(const std::string& data,
+                              const base::TimeTicks& timestamp,
+                              bool keyframe,
+                              const gfx::Size& frame_size,
+                              double frame_rate)>
+      VideoEncoderCB;
+
+  VideoTrackRecorder(const blink::WebMediaStreamTrack& track,
+                     const VideoEncoderCB& callback);
+  ~VideoTrackRecorder() override;
+
+ private:
+  // Used to DCHECK that we are called on the correct thread.
+  base::ThreadChecker thread_checker_;
+
+  // Reference to the Track the Recorder is hanging from, to remove on dtor.
+  blink::WebMediaStreamTrack web_track_;
+
+  class Encoder;
+  scoped_refptr<Encoder> encoder_;
+  DISALLOW_COPY_AND_ASSIGN(VideoTrackRecorder);
+};
+
+}  // namespace content
+#endif  // CONTENT_RENDERER_MEDIA_VIDEO_TRACK_RECORDER_H_