[backup] Add MediaRecorderHandler (video part)

content/renderer/media/media_recorder_handler.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_MEDIA_RECORDER_HANDLER_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_RECORDER_HANDLER_H_
+
+#include "base/memory/scoped_vector.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/string_piece.h"
+#include "base/threading/thread_checker.h"
+#include "content/common/content_export.h"
+#include "third_party/WebKit/public/platform/WebMediaRecorderHandler.h"
+#include "third_party/WebKit/public/platform/WebMediaStream.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+
+namespace media {
+class VideoFrame;
+class WebmMuxer;
+}  // namespace media
+
+namespace content {
+
+class VideoTrackRecorder;
+
+// MediaRecorderHandler orchestrates the creation, lifetime mgmt and mapping
+// between:
+// - MediaStreamTrack(s) providing data,
+// - {Audio,Video}TrackRecorders encoding that data,
+// - a WebmMuxer class multiplexing encoded data into a WebM container, and
+// - a single recorder client receiving this contained data.
+// All methods are called on the same thread as construction and destruction,
+// i.e. the Main Render thread.
+// TODO(mcasas): Implement audio recording.
+class CONTENT_EXPORT MediaRecorderHandler final
+    : NON_EXPORTED_BASE(public blink::WebMediaRecorderHandler) {
+ public:
+  MediaRecorderHandler();
+  ~MediaRecorderHandler();
+
+  // Implements blink::WebMediaRecorderHandler.
+  bool canSupportMimeType(const blink::WebString& mimeType);
+  bool initialize(blink::WebMediaRecorderHandlerClient* client,
+                  const blink::WebMediaStream& media_stream,
+                  const blink::WebString& mimeType) override;
+  bool start() override;
+  bool start(int timeslice) override;
+  void stop() override;
+  void pause() override;
+  void resume() override;
+
+ private:
+  friend class MediaRecorderHandlerTest;
+
+  void WriteData(const base::StringPiece& data);
+
+  void OnVideoFrameForTesting(const scoped_refptr<media::VideoFrame>& frame,
+                              const base::TimeTicks& timestamp);
+
+  // Bound to the main render thread.
+  base::ThreadChecker main_render_thread_checker_;
+
+  bool recording_;
+  blink::WebMediaStream media_stream_;  // The MediaStream being recorded.
+
+  // |client_| is a weak pointer, and is valid for the lifetime of this object.
+  blink::WebMediaRecorderHandlerClient* client_;
+
+  ScopedVector<VideoTrackRecorder> video_recorders_;
+
+  // Worker class doing the actual Webm Muxing work.
+  scoped_ptr<media::WebmMuxer> webm_muxer_;
+
+  base::WeakPtrFactory<MediaRecorderHandler> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MediaRecorderHandler);
+};
+
+}  // namespace content
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_RECORDER_HANDLER_H_