Preliminary change for new rtc rendering algorithm

content/renderer/media/webmediaplayer_ms.h

 // Copyright 2013 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_WEBMEDIAPLAYER_MS_H_
 #define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 35 matching lines @@
 //   provides video frames for rendering.
 //
 // TODO(wjia): add AudioPlayer.
 // AudioPlayer
 //   plays audio streams.
 //
 // blink::WebMediaPlayerClient
 //   WebKit client of this media player object.
 class WebMediaPlayerMS
     : public blink::WebMediaPlayer,
-      public cc::VideoFrameProvider,
       public base::SupportsWeakPtr<WebMediaPlayerMS> {
  public:
   // Construct a WebMediaPlayerMS with reference to the client, and
   // a MediaStreamClient which provides VideoFrameProvider.
   WebMediaPlayerMS(blink::WebFrame* frame,
                    blink::WebMediaPlayerClient* client,
                    base::WeakPtr<media::WebMediaPlayerDelegate> delegate,
                    media::MediaLog* media_log,
-                   scoped_ptr<MediaStreamRendererFactory> factory);
+                   scoped_ptr<MediaStreamRendererFactory> factory,
+                   const scoped_refptr<base::SingleThreadTaskRunner>&
+                       compositor_task_runner);
+
   virtual ~WebMediaPlayerMS();
 
   virtual void load(LoadType load_type,
                     const blink::WebURL& url,
                     CORSMode cors_mode);
 
   // Playback controls.
   virtual void play();
   virtual void pause();
   virtual bool supportsSave() const;
@@ skipping 42 matching lines @@
   virtual unsigned videoDecodedByteCount() const;
 
   bool copyVideoTextureToPlatformTexture(
       blink::WebGraphicsContext3D* web_graphics_context,
       unsigned int texture,
       unsigned int internal_format,
       unsigned int type,
       bool premultiply_alpha,
       bool flip_y) override;
 
-  // VideoFrameProvider implementation.
-  void SetVideoFrameProviderClient(
-      cc::VideoFrameProvider::Client* client) override;
-  bool UpdateCurrentFrame(base::TimeTicks deadline_min,
-                          base::TimeTicks deadline_max) override;
-  bool HasCurrentFrame() override;
-  scoped_refptr<media::VideoFrame> GetCurrentFrame() override;
-  void PutCurrentFrame() override;
+ private:
+  class Compositor : public cc::VideoFrameProvider {
+   public:
+    explicit Compositor(const scoped_refptr<base::SingleThreadTaskRunner>&
+                            compositor_task_runner);
+    ~Compositor() override;
 
- private:
+    void EnqueueFrame(scoped_refptr<media::VideoFrame> const& frame);
+
+    // Statistical data
+    gfx::Size GetCurrentSize();
+    base::TimeDelta GetCurrentTime();
+    unsigned GetTotalFrameCount();
+    unsigned GetDroppedFrameCount();
+
+    // VideoFrameProvider implementation.
+    void SetVideoFrameProviderClient(
+        cc::VideoFrameProvider::Client* client) override;
+    bool UpdateCurrentFrame(base::TimeTicks deadline_min,
+                            base::TimeTicks deadline_max) override;
+    bool HasCurrentFrame() override;
+    scoped_refptr<media::VideoFrame> GetCurrentFrame() override;
+    void PutCurrentFrame() override;
+
+    void StartRendering();
+    void StopRendering();
+
+   private:
+    scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
+
+    // A pointer back to the compositor to inform it about state changes. This
+    // is not NULL while the compositor is actively using this webmediaplayer.
+    cc::VideoFrameProvider::Client* video_frame_provider_client_;
+
+    // |current_frame_| is updated only on compositor thread. The object it
+    // holds can be freed on the compositor thread if it is the last to hold a
+    // reference but media::VideoFrame is a thread-safe ref-pointer. It is
+    // however read on the compositor and main thread so locking is required
+    // around all modifications and all reads on the any thread.
+    scoped_refptr<media::VideoFrame> current_frame_;
+
+    // |current_frame_used_| is updated on compositor thread only.
+    // It's used to track whether |current_frame_| was painted for detecting
+    // when to increase |dropped_frame_count_|.
+    bool current_frame_used_;
+
+    // TODO(qiangchen): To be replaced by VRA.
+    scoped_refptr<media::VideoFrame> staging_frame_;
+
+    base::TimeTicks last_deadline_max_;
+    unsigned total_frame_count_;
+    unsigned dropped_frame_count_;
+
+    bool paused_;
+
+    media::SkCanvasVideoRenderer video_renderer_;
+
+    // |current_frame_lock_| protects |current_frame_used_| and
+    // |current_frame_|.
+    base::Lock current_frame_lock_;
+  };
+
   // The callback for VideoFrameProvider to signal a new frame is available.
   void OnFrameAvailable(const scoped_refptr<media::VideoFrame>& frame);
   // Need repaint due to state change.
   void RepaintInternal();
 
   // The callback for source to report error.
   void OnSourceError();
 
   // Helpers that set the network/ready state and notifies the client if
   // they've changed.
@@ skipping 16 matching lines @@
   base::ThreadChecker thread_checker_;
 
   blink::WebMediaPlayerClient* client_;
 
   base::WeakPtr<media::WebMediaPlayerDelegate> delegate_;
 
   // Specify content:: to disambiguate from cc::.
   scoped_refptr<content::VideoFrameProvider> video_frame_provider_;
   bool paused_;
 
-  // |current_frame_| is updated only on main thread. The object it holds
-  // can be freed on the compositor thread if it is the last to hold a
-  // reference but media::VideoFrame is a thread-safe ref-pointer. It is
-  // however read on the compositing thread so locking is required around all
-  // modifications on the main thread, and all reads on the compositing thread.
-  scoped_refptr<media::VideoFrame> current_frame_;
-  // |current_frame_used_| is updated on both main and compositing thread.
-  // It's used to track whether |current_frame_| was painted for detecting
-  // when to increase |dropped_frame_count_|.
-  bool current_frame_used_;
-  // |current_frame_lock_| protects |current_frame_used_| and |current_frame_|.
-  base::Lock current_frame_lock_;
-
   scoped_ptr<cc_blink::WebLayerImpl> video_weblayer_;
 
-  // A pointer back to the compositor to inform it about state changes. This is
-  // not NULL while the compositor is actively using this webmediaplayer.
-  cc::VideoFrameProvider::Client* video_frame_provider_client_;
-
   bool received_first_frame_;
-  base::TimeDelta current_time_;
-  unsigned total_frame_count_;
-  unsigned dropped_frame_count_;
-  media::SkCanvasVideoRenderer video_renderer_;
 
   scoped_refptr<MediaStreamAudioRenderer> audio_renderer_;
 
+  media::SkCanvasVideoRenderer video_renderer_;
+
   scoped_refptr<media::MediaLog> media_log_;
 
   scoped_ptr<MediaStreamRendererFactory> renderer_factory_;
 
+  // WebMediaPlayerMS owns the Compositor instance, but the destructions of
+  // compositor should take place on Compositor Thread.
+  scoped_ptr<Compositor> compositor_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
+
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerMS);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_