media/mojo/services/mojo_renderer_service.h

   1 // Copyright 2014 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_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_
   6 #define MEDIA_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_
   7
   8 #include "base/callback.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/macros.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/memory/weak_ptr.h"
  13 #include "base/timer/timer.h"
  14 #include "media/base/audio_decoder_config.h"
  15 #include "media/base/buffering_state.h"
  16 #include "media/base/media_export.h"
  17 #include "media/base/pipeline_status.h"
  18 #include "media/mojo/interfaces/media_renderer.mojom.h"
  19 #include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
  20
  21 namespace mojo {
  22 class ApplicationConnection;
  23 }
  24
  25 namespace media {
  26
  27 class AudioRendererSink;
  28 class DemuxerStreamProviderShim;
  29 class CdmContextProvider;
  30 class MediaLog;
  31 class Renderer;
  32 class RendererFactory;
  33 class VideoRendererSink;
  34
  35 // A mojo::MediaRenderer implementation that uses media::AudioRenderer to
  36 // decode and render audio to a sink obtained from the ApplicationConnection.
  37 class MEDIA_EXPORT MojoRendererService
  38     : NON_EXPORTED_BASE(mojo::MediaRenderer) {
  39  public:
  40   // |cdm_context_provider| can be used to find the CdmContext to support
  41   // encrypted media. If null, encrypted media is not supported.
  42   MojoRendererService(CdmContextProvider* cdm_context_provider,
  43                       RendererFactory* renderer_factory,
  44                       const scoped_refptr<MediaLog>& media_log,
  45                       mojo::InterfaceRequest<mojo::MediaRenderer> request);
  46   ~MojoRendererService() final;
  47
  48   // mojo::MediaRenderer implementation.
  49   void Initialize(mojo::MediaRendererClientPtr client,
  50                   mojo::DemuxerStreamPtr audio,
  51                   mojo::DemuxerStreamPtr video,
  52                   const mojo::Callback<void(bool)>& callback) final;
  53   void Flush(const mojo::Closure& callback) final;
  54   void StartPlayingFrom(int64_t time_delta_usec) final;
  55   void SetPlaybackRate(double playback_rate) final;
  56   void SetVolume(float volume) final;
  57   void SetCdm(int32_t cdm_id, const mojo::Callback<void(bool)>& callback) final;
  58
  59  private:
  60   enum State {
  61     STATE_UNINITIALIZED,
  62     STATE_INITIALIZING,
  63     STATE_FLUSHING,
  64     STATE_PLAYING,
  65     STATE_ERROR
  66   };
  67
  68   // Called when the DemuxerStreamProviderShim is ready to go (has a config,
  69   // pipe handle, etc) and can be handed off to a renderer for use.
  70   void OnStreamReady(const mojo::Callback<void(bool)>& callback);
  71
  72   // Called when |audio_renderer_| initialization has completed.
  73   void OnRendererInitializeDone(const mojo::Callback<void(bool)>& callback,
  74                                 PipelineStatus status);
  75
  76   // Callback executed by filters to update statistics.
  77   void OnUpdateStatistics(const PipelineStatistics& stats);
  78
  79   // Periodically polls the media time from the renderer and notifies the client
  80   // if the media time has changed since the last update.  If |force| is true,
  81   // the client is notified even if the time is unchanged.
  82   void UpdateMediaTime(bool force);
  83   void CancelPeriodicMediaTimeUpdates();
  84   void SchedulePeriodicMediaTimeUpdates();
  85
  86   // Callback executed by audio renderer when buffering state changes.
  87   // TODO(tim): Need old and new.
  88   void OnBufferingStateChanged(BufferingState new_buffering_state);
  89
  90   // Callback executed when a renderer has ended.
  91   void OnRendererEnded();
  92
  93   // Callback executed when a runtime error happens.
  94   void OnError(PipelineStatus error);
  95
  96   // Callback executed once Flush() completes.
  97   void OnFlushCompleted(const mojo::Closure& callback);
  98
  99   // Callback executed once SetCdm() completes.
 100   void OnCdmAttached(const mojo::Callback<void(bool)>& callback, bool success);
 101
 102   mojo::StrongBinding<mojo::MediaRenderer> binding_;
 103
 104   CdmContextProvider* cdm_context_provider_;
 105
 106   State state_;
 107
 108   // Note: |renderer_| should be destructed before these objects to avoid access
 109   // violation.
 110   scoped_ptr<DemuxerStreamProviderShim> stream_provider_;
 111   scoped_refptr<AudioRendererSink> audio_renderer_sink_;
 112   scoped_ptr<VideoRendererSink> video_renderer_sink_;
 113
 114   scoped_ptr<Renderer> renderer_;
 115
 116   base::RepeatingTimer<MojoRendererService> time_update_timer_;
 117   uint64_t last_media_time_usec_;
 118
 119   mojo::MediaRendererClientPtr client_;
 120
 121   base::WeakPtr<MojoRendererService> weak_this_;
 122   base::WeakPtrFactory<MojoRendererService> weak_factory_;
 123
 124   DISALLOW_COPY_AND_ASSIGN(MojoRendererService);
 125 };
 126
 127 }  // namespace media
 128
 129 #endif  // MEDIA_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_