content/renderer/media/webmediaplayer_ms.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
   6 #define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/synchronization/lock.h"
  12 #include "base/threading/thread_checker.h"
  13 #include "cc/layers/video_frame_provider.h"
  14 #include "media/filters/skcanvas_video_renderer.h"
  15 #include "skia/ext/platform_canvas.h"
  16 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
  17 #include "url/gurl.h"
  18
  19 namespace blink {
  20 class WebFrame;
  21 class WebMediaPlayerClient;
  22 }
  23
  24 namespace media {
  25 class MediaLog;
  26 class WebMediaPlayerDelegate;
  27 }
  28
  29 namespace cc_blink {
  30 class WebLayerImpl;
  31 }
  32
  33 namespace content {
  34 class MediaStreamAudioRenderer;
  35 class MediaStreamRendererFactory;
  36 class VideoFrameProvider;
  37
  38 // WebMediaPlayerMS delegates calls from WebCore::MediaPlayerPrivate to
  39 // Chrome's media player when "src" is from media stream.
  40 //
  41 // WebMediaPlayerMS works with multiple objects, the most important ones are:
  42 //
  43 // VideoFrameProvider
  44 //   provides video frames for rendering.
  45 //
  46 // TODO(wjia): add AudioPlayer.
  47 // AudioPlayer
  48 //   plays audio streams.
  49 //
  50 // blink::WebMediaPlayerClient
  51 //   WebKit client of this media player object.
  52 class WebMediaPlayerMS
  53     : public blink::WebMediaPlayer,
  54       public cc::VideoFrameProvider,
  55       public base::SupportsWeakPtr<WebMediaPlayerMS> {
  56  public:
  57   // Construct a WebMediaPlayerMS with reference to the client, and
  58   // a MediaStreamClient which provides VideoFrameProvider.
  59   WebMediaPlayerMS(blink::WebFrame* frame,
  60                    blink::WebMediaPlayerClient* client,
  61                    base::WeakPtr<media::WebMediaPlayerDelegate> delegate,
  62                    media::MediaLog* media_log,
  63                    scoped_ptr<MediaStreamRendererFactory> factory);
  64   virtual ~WebMediaPlayerMS();
  65
  66   virtual void load(LoadType load_type,
  67                     const blink::WebURL& url,
  68                     CORSMode cors_mode);
  69
  70   // Playback controls.
  71   virtual void play();
  72   virtual void pause();
  73   virtual bool supportsSave() const;
  74   virtual void seek(double seconds);
  75   virtual void setRate(double rate);
  76   virtual void setVolume(double volume);
  77   virtual void setPreload(blink::WebMediaPlayer::Preload preload);
  78   virtual blink::WebTimeRanges buffered() const;
  79   virtual blink::WebTimeRanges seekable() const;
  80
  81   // Methods for painting.
  82   virtual void paint(blink::WebCanvas* canvas,
  83                      const blink::WebRect& rect,
  84                      unsigned char alpha,
  85                      SkXfermode::Mode mode);
  86
  87   // True if the loaded media has a playable video/audio track.
  88   virtual bool hasVideo() const;
  89   virtual bool hasAudio() const;
  90
  91   // Dimensions of the video.
  92   virtual blink::WebSize naturalSize() const;
  93
  94   // Getters of playback state.
  95   virtual bool paused() const;
  96   virtual bool seeking() const;
  97   virtual double duration() const;
  98   virtual double currentTime() const;
  99
 100   // Internal states of loading and network.
 101   virtual blink::WebMediaPlayer::NetworkState networkState() const;
 102   virtual blink::WebMediaPlayer::ReadyState readyState() const;
 103
 104   virtual bool didLoadingProgress();
 105
 106   virtual bool hasSingleSecurityOrigin() const;
 107   virtual bool didPassCORSAccessCheck() const;
 108
 109   virtual double mediaTimeForTimeValue(double timeValue) const;
 110
 111   virtual unsigned decodedFrameCount() const;
 112   virtual unsigned droppedFrameCount() const;
 113   virtual unsigned audioDecodedByteCount() const;
 114   virtual unsigned videoDecodedByteCount() const;
 115
 116   // VideoFrameProvider implementation.
 117   void SetVideoFrameProviderClient(
 118       cc::VideoFrameProvider::Client* client) override;
 119   scoped_refptr<media::VideoFrame> GetCurrentFrame() override;
 120   void PutCurrentFrame(const scoped_refptr<media::VideoFrame>& frame) override;
 121
 122  private:
 123   // The callback for VideoFrameProvider to signal a new frame is available.
 124   void OnFrameAvailable(const scoped_refptr<media::VideoFrame>& frame);
 125   // Need repaint due to state change.
 126   void RepaintInternal();
 127
 128   // The callback for source to report error.
 129   void OnSourceError();
 130
 131   // Helpers that set the network/ready state and notifies the client if
 132   // they've changed.
 133   void SetNetworkState(blink::WebMediaPlayer::NetworkState state);
 134   void SetReadyState(blink::WebMediaPlayer::ReadyState state);
 135
 136   // Getter method to |client_|.
 137   blink::WebMediaPlayerClient* GetClient();
 138
 139   blink::WebFrame* frame_;
 140
 141   blink::WebMediaPlayer::NetworkState network_state_;
 142   blink::WebMediaPlayer::ReadyState ready_state_;
 143
 144   blink::WebTimeRanges buffered_;
 145
 146   float volume_;
 147
 148   // Used for DCHECKs to ensure methods calls executed in the correct thread.
 149   base::ThreadChecker thread_checker_;
 150
 151   blink::WebMediaPlayerClient* client_;
 152
 153   base::WeakPtr<media::WebMediaPlayerDelegate> delegate_;
 154
 155   // Specify content:: to disambiguate from cc::.
 156   scoped_refptr<content::VideoFrameProvider> video_frame_provider_;
 157   bool paused_;
 158
 159   // |current_frame_| is updated only on main thread. The object it holds
 160   // can be freed on the compositor thread if it is the last to hold a
 161   // reference but media::VideoFrame is a thread-safe ref-pointer. It is
 162   // however read on the compositing thread so locking is required around all
 163   // modifications on the main thread, and all reads on the compositing thread.
 164   scoped_refptr<media::VideoFrame> current_frame_;
 165   // |current_frame_used_| is updated on both main and compositing thread.
 166   // It's used to track whether |current_frame_| was painted for detecting
 167   // when to increase |dropped_frame_count_|.
 168   bool current_frame_used_;
 169   // |current_frame_lock_| protects |current_frame_used_| and |current_frame_|.
 170   base::Lock current_frame_lock_;
 171   bool pending_repaint_;
 172
 173   scoped_ptr<cc_blink::WebLayerImpl> video_weblayer_;
 174
 175   // A pointer back to the compositor to inform it about state changes. This is
 176   // not NULL while the compositor is actively using this webmediaplayer.
 177   cc::VideoFrameProvider::Client* video_frame_provider_client_;
 178
 179   bool received_first_frame_;
 180   base::TimeDelta current_time_;
 181   unsigned total_frame_count_;
 182   unsigned dropped_frame_count_;
 183   media::SkCanvasVideoRenderer video_renderer_;
 184
 185   scoped_refptr<MediaStreamAudioRenderer> audio_renderer_;
 186
 187   scoped_refptr<media::MediaLog> media_log_;
 188
 189   scoped_ptr<MediaStreamRendererFactory> renderer_factory_;
 190
 191   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerMS);
 192 };
 193
 194 }  // namespace content
 195
 196 #endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_