media/blink/webmediaplayer_impl.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 MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
   6 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "base/basictypes.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/memory/ref_counted.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/threading/thread.h"
  17 #include "media/base/cdm_factory.h"
  18 #include "media/base/media_export.h"
  19 #include "media/base/pipeline.h"
  20 #include "media/base/renderer_factory.h"
  21 #include "media/base/text_track.h"
  22 #include "media/blink/buffered_data_source.h"
  23 #include "media/blink/buffered_data_source_host_impl.h"
  24 #include "media/blink/encrypted_media_player_support.h"
  25 #include "media/blink/skcanvas_video_renderer.h"
  26 #include "media/blink/video_frame_compositor.h"
  27 #include "media/blink/webmediaplayer_params.h"
  28 #include "third_party/WebKit/public/platform/WebAudioSourceProvider.h"
  29 #include "third_party/WebKit/public/platform/WebContentDecryptionModuleResult.h"
  30 #include "third_party/WebKit/public/platform/WebMediaPlayer.h"
  31 #include "third_party/WebKit/public/platform/WebMediaPlayerClient.h"
  32 #include "url/gurl.h"
  33
  34 namespace blink {
  35 class WebGraphicsContext3D;
  36 class WebLocalFrame;
  37 }
  38
  39 namespace base {
  40 class SingleThreadTaskRunner;
  41 }
  42
  43 namespace cc_blink {
  44 class WebLayerImpl;
  45 }
  46
  47 namespace media {
  48
  49 class AudioHardwareConfig;
  50 class ChunkDemuxer;
  51 class GpuVideoAcceleratorFactories;
  52 class MediaLog;
  53 class VideoFrameCompositor;
  54 class WebAudioSourceProviderImpl;
  55 class WebMediaPlayerDelegate;
  56 class WebTextTrackImpl;
  57
  58 // The canonical implementation of blink::WebMediaPlayer that's backed by
  59 // Pipeline. Handles normal resource loading, Media Source, and
  60 // Encrypted Media.
  61 class MEDIA_EXPORT WebMediaPlayerImpl
  62     : public NON_EXPORTED_BASE(blink::WebMediaPlayer),
  63       public base::SupportsWeakPtr<WebMediaPlayerImpl> {
  64  public:
  65   // Constructs a WebMediaPlayer implementation using Chromium's media stack.
  66   // |delegate| may be null. |renderer| may also be null, in which case an
  67   // internal renderer will be created.
  68   // TODO(xhwang): Drop the internal renderer path and always pass in a renderer
  69   // here.
  70   WebMediaPlayerImpl(blink::WebLocalFrame* frame,
  71                      blink::WebMediaPlayerClient* client,
  72                      base::WeakPtr<WebMediaPlayerDelegate> delegate,
  73                      scoped_ptr<RendererFactory> renderer_factory,
  74                      CdmFactory* cdm_factory,
  75                      const WebMediaPlayerParams& params);
  76   virtual ~WebMediaPlayerImpl();
  77
  78   virtual void load(LoadType load_type,
  79                     const blink::WebURL& url,
  80                     CORSMode cors_mode);
  81
  82   // Playback controls.
  83   virtual void play();
  84   virtual void pause();
  85   virtual bool supportsSave() const;
  86   virtual void seek(double seconds);
  87   virtual void setRate(double rate);
  88   virtual void setVolume(double volume);
  89   virtual void setPreload(blink::WebMediaPlayer::Preload preload);
  90   virtual blink::WebTimeRanges buffered() const;
  91   virtual blink::WebTimeRanges seekable() const;
  92
  93   // Methods for painting.
  94   virtual void paint(blink::WebCanvas* canvas,
  95                      const blink::WebRect& rect,
  96                      unsigned char alpha,
  97                      SkXfermode::Mode mode);
  98
  99   // True if the loaded media has a playable video/audio track.
 100   virtual bool hasVideo() const;
 101   virtual bool hasAudio() const;
 102
 103   // Dimensions of the video.
 104   virtual blink::WebSize naturalSize() const;
 105
 106   // Getters of playback state.
 107   virtual bool paused() const;
 108   virtual bool seeking() const;
 109   virtual double duration() const;
 110   virtual double timelineOffset() const;
 111   virtual double currentTime() const;
 112
 113   // Internal states of loading and network.
 114   // TODO(hclam): Ask the pipeline about the state rather than having reading
 115   // them from members which would cause race conditions.
 116   virtual blink::WebMediaPlayer::NetworkState networkState() const;
 117   virtual blink::WebMediaPlayer::ReadyState readyState() const;
 118
 119   virtual bool didLoadingProgress();
 120
 121   virtual bool hasSingleSecurityOrigin() const;
 122   virtual bool didPassCORSAccessCheck() const;
 123
 124   virtual double mediaTimeForTimeValue(double timeValue) const;
 125
 126   virtual unsigned decodedFrameCount() const;
 127   virtual unsigned droppedFrameCount() const;
 128   virtual unsigned audioDecodedByteCount() const;
 129   virtual unsigned videoDecodedByteCount() const;
 130
 131   // TODO(dshwang): remove |level|. crbug.com/443151
 132   virtual bool copyVideoTextureToPlatformTexture(
 133       blink::WebGraphicsContext3D* web_graphics_context,
 134       unsigned int texture,
 135       unsigned int level,
 136       unsigned int internal_format,
 137       unsigned int type,
 138       bool premultiply_alpha,
 139       bool flip_y);
 140   virtual bool copyVideoTextureToPlatformTexture(
 141       blink::WebGraphicsContext3D* web_graphics_context,
 142       unsigned int texture,
 143       unsigned int internal_format,
 144       unsigned int type,
 145       bool premultiply_alpha,
 146       bool flip_y);
 147
 148   virtual blink::WebAudioSourceProvider* audioSourceProvider();
 149
 150   virtual MediaKeyException generateKeyRequest(
 151       const blink::WebString& key_system,
 152       const unsigned char* init_data,
 153       unsigned init_data_length);
 154
 155   virtual MediaKeyException addKey(const blink::WebString& key_system,
 156                                    const unsigned char* key,
 157                                    unsigned key_length,
 158                                    const unsigned char* init_data,
 159                                    unsigned init_data_length,
 160                                    const blink::WebString& session_id);
 161
 162   virtual MediaKeyException cancelKeyRequest(
 163       const blink::WebString& key_system,
 164       const blink::WebString& session_id);
 165
 166   virtual void setContentDecryptionModule(
 167       blink::WebContentDecryptionModule* cdm,
 168       blink::WebContentDecryptionModuleResult result);
 169
 170   void OnPipelineSeeked(bool time_changed, PipelineStatus status);
 171   void OnPipelineEnded();
 172   void OnPipelineError(PipelineStatus error);
 173   void OnPipelineMetadata(PipelineMetadata metadata);
 174   void OnPipelineBufferingStateChanged(BufferingState buffering_state);
 175   void OnDemuxerOpened();
 176   void OnAddTextTrack(const TextTrackConfig& config,
 177                       const AddTextTrackDoneCB& done_cb);
 178
 179  private:
 180   // Called after |defer_load_cb_| has decided to allow the load. If
 181   // |defer_load_cb_| is null this is called immediately.
 182   void DoLoad(LoadType load_type,
 183               const blink::WebURL& url,
 184               CORSMode cors_mode);
 185
 186   // Called after asynchronous initialization of a data source completed.
 187   void DataSourceInitialized(bool success);
 188
 189   // Called when the data source is downloading or paused.
 190   void NotifyDownloading(bool is_downloading);
 191
 192   // Creates a Renderer that will be used by the |pipeline_|.
 193   scoped_ptr<Renderer> CreateRenderer();
 194
 195   // Finishes starting the pipeline due to a call to load().
 196   void StartPipeline();
 197
 198   // Helpers that set the network/ready state and notifies the client if
 199   // they've changed.
 200   void SetNetworkState(blink::WebMediaPlayer::NetworkState state);
 201   void SetReadyState(blink::WebMediaPlayer::ReadyState state);
 202
 203   // Gets the duration value reported by the pipeline.
 204   double GetPipelineDuration() const;
 205
 206   // Callbacks from |pipeline_| that are forwarded to |client_|.
 207   void OnDurationChanged();
 208   void OnNaturalSizeChanged(gfx::Size size);
 209   void OnOpacityChanged(bool opaque);
 210
 211   // Called by VideoRendererImpl on its internal thread with the new frame to be
 212   // painted.
 213   void FrameReady(const scoped_refptr<VideoFrame>& frame);
 214
 215   // Returns the current video frame from |compositor_|. Blocks until the
 216   // compositor can return the frame.
 217   scoped_refptr<VideoFrame> GetCurrentFrameFromCompositor();
 218
 219   // Called when the demuxer encounters encrypted streams.
 220   void OnEncryptedMediaInitData(EmeInitDataType init_data_type,
 221                                 const std::vector<uint8>& init_data);
 222
 223   // Called when a decoder detects that the key needed to decrypt the stream
 224   // is not available.
 225   void OnWaitingForDecryptionKey();
 226
 227   // Sets |cdm_context| on the pipeline and fires |cdm_attached_cb| when done.
 228   // Parameter order is reversed for easy binding.
 229   void SetCdm(const CdmAttachedCB& cdm_attached_cb, CdmContext* cdm_context);
 230
 231   // Called when a CDM has been attached to the |pipeline_|.
 232   void OnCdmAttached(blink::WebContentDecryptionModuleResult result,
 233                      bool success);
 234
 235   // Updates |paused_time_| to the current media time with consideration for the
 236   // |ended_| state by clamping current time to duration upon |ended_|.
 237   void UpdatePausedTime();
 238
 239   blink::WebLocalFrame* frame_;
 240
 241   // TODO(hclam): get rid of these members and read from the pipeline directly.
 242   blink::WebMediaPlayer::NetworkState network_state_;
 243   blink::WebMediaPlayer::ReadyState ready_state_;
 244
 245   // Preload state for when |data_source_| is created after setPreload().
 246   BufferedDataSource::Preload preload_;
 247
 248   // Task runner for posting tasks on Chrome's main thread. Also used
 249   // for DCHECKs so methods calls won't execute in the wrong thread.
 250   const scoped_refptr<base::SingleThreadTaskRunner> main_task_runner_;
 251
 252   scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
 253   scoped_refptr<MediaLog> media_log_;
 254   Pipeline pipeline_;
 255
 256   // The LoadType passed in the |load_type| parameter of the load() call.
 257   LoadType load_type_;
 258
 259   // Cache of metadata for answering hasAudio(), hasVideo(), and naturalSize().
 260   PipelineMetadata pipeline_metadata_;
 261
 262   // Whether the video is known to be opaque or not.
 263   bool opaque_;
 264
 265   // Playback state.
 266   //
 267   // TODO(scherkus): we have these because Pipeline favours the simplicity of a
 268   // single "playback rate" over worrying about paused/stopped etc...  It forces
 269   // all clients to manage the pause+playback rate externally, but is that
 270   // really a bad thing?
 271   //
 272   // TODO(scherkus): since SetPlaybackRate(0) is asynchronous and we don't want
 273   // to hang the render thread during pause(), we record the time at the same
 274   // time we pause and then return that value in currentTime().  Otherwise our
 275   // clock can creep forward a little bit while the asynchronous
 276   // SetPlaybackRate(0) is being executed.
 277   bool paused_;
 278   bool seeking_;
 279   double playback_rate_;
 280   base::TimeDelta paused_time_;
 281
 282   // TODO(scherkus): Replace with an explicit ended signal to HTMLMediaElement,
 283   // see http://crbug.com/409280
 284   bool ended_;
 285
 286   // Seek gets pending if another seek is in progress. Only last pending seek
 287   // will have effect.
 288   bool pending_seek_;
 289   double pending_seek_seconds_;
 290
 291   // Tracks whether to issue time changed notifications during buffering state
 292   // changes.
 293   bool should_notify_time_changed_;
 294
 295   blink::WebMediaPlayerClient* client_;
 296
 297   base::WeakPtr<WebMediaPlayerDelegate> delegate_;
 298
 299   WebMediaPlayerParams::DeferLoadCB defer_load_cb_;
 300   WebMediaPlayerParams::Context3DCB context_3d_cb_;
 301
 302   // Routes audio playback to either AudioRendererSink or WebAudio.
 303   scoped_refptr<WebAudioSourceProviderImpl> audio_source_provider_;
 304
 305   bool supports_save_;
 306
 307   // These two are mutually exclusive:
 308   //   |data_source_| is used for regular resource loads.
 309   //   |chunk_demuxer_| is used for Media Source resource loads.
 310   //
 311   // |demuxer_| will contain the appropriate demuxer based on which resource
 312   // load strategy we're using.
 313   scoped_ptr<BufferedDataSource> data_source_;
 314   scoped_ptr<Demuxer> demuxer_;
 315   ChunkDemuxer* chunk_demuxer_;
 316
 317   BufferedDataSourceHostImpl buffered_data_source_host_;
 318
 319   // Video rendering members.
 320   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
 321   VideoFrameCompositor* compositor_;  // Deleted on |compositor_task_runner_|.
 322   SkCanvasVideoRenderer skcanvas_video_renderer_;
 323
 324   // The compositor layer for displaying the video content when using composited
 325   // playback.
 326   scoped_ptr<cc_blink::WebLayerImpl> video_weblayer_;
 327
 328   EncryptedMediaPlayerSupport encrypted_media_support_;
 329
 330   scoped_ptr<RendererFactory> renderer_factory_;
 331
 332   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 333 };
 334
 335 }  // namespace media
 336
 337 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_