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/interface_impl.h"
  20
  21 namespace mojo {
  22 class ApplicationConnection;
  23 }
  24
  25 namespace media {
  26
  27 class AudioRendererSink;
  28 class DemuxerStreamProviderShim;
  29 class MojoDemuxerStreamAdapter;
  30 class Renderer;
  31
  32 // A mojo::MediaRenderer implementation that uses media::AudioRenderer to
  33 // decode and render audio to a sink obtained from the ApplicationConnection.
  34 class MEDIA_EXPORT MojoRendererService
  35     : NON_EXPORTED_BASE(public mojo::InterfaceImpl<mojo::MediaRenderer>) {
  36  public:
  37   MojoRendererService();
  38   ~MojoRendererService() override;
  39
  40   // mojo::MediaRenderer implementation.
  41   void Initialize(mojo::DemuxerStreamPtr audio,
  42                   mojo::DemuxerStreamPtr video,
  43                   const mojo::Closure& callback) override;
  44   void Flush(const mojo::Closure& callback) override;
  45   void StartPlayingFrom(int64_t time_delta_usec) override;
  46   void SetPlaybackRate(float playback_rate) override;
  47   void SetVolume(float volume) override;
  48
  49  private:
  50   enum State {
  51     STATE_UNINITIALIZED,
  52     STATE_INITIALIZING,
  53     STATE_FLUSHING,
  54     STATE_PLAYING,
  55     STATE_ERROR
  56   };
  57
  58   // Called when the MojoDemuxerStreamAdapter is ready to go (has a config,
  59   // pipe handle, etc) and can be handed off to a renderer for use.
  60   void OnStreamReady(const mojo::Closure& callback);
  61
  62   // Called when |audio_renderer_| initialization has completed.
  63   void OnRendererInitializeDone(const mojo::Closure& callback,
  64                                 PipelineStatus status);
  65
  66   // Callback executed by filters to update statistics.
  67   void OnUpdateStatistics(const PipelineStatistics& stats);
  68
  69   // Periodically polls the media time from the renderer and notifies the client
  70   // if the media time has changed since the last update.  If |force| is true,
  71   // the client is notified even if the time is unchanged.
  72   void UpdateMediaTime(bool force);
  73   void CancelPeriodicMediaTimeUpdates();
  74   void SchedulePeriodicMediaTimeUpdates();
  75
  76   // Callback executed by audio renderer when buffering state changes.
  77   // TODO(tim): Need old and new.
  78   void OnBufferingStateChanged(BufferingState new_buffering_state);
  79
  80   // Callback executed when a renderer has ended.
  81   void OnRendererEnded();
  82
  83   // Callback executed when a runtime error happens.
  84   void OnError(PipelineStatus error);
  85
  86   // Callback executed once Flush() completes.
  87   void OnFlushCompleted(const mojo::Closure& callback);
  88
  89   State state_;
  90
  91   scoped_refptr<AudioRendererSink> audio_renderer_sink_;
  92   scoped_ptr<Renderer> renderer_;
  93   scoped_ptr<DemuxerStreamProviderShim> stream_provider_;
  94
  95   base::RepeatingTimer<MojoRendererService> time_update_timer_;
  96   uint64_t last_media_time_usec_;
  97
  98   base::WeakPtr<MojoRendererService> weak_this_;
  99   base::WeakPtrFactory<MojoRendererService> weak_factory_;
 100
 101   DISALLOW_COPY_AND_ASSIGN(MojoRendererService);
 102 };
 103
 104 }  // namespace media
 105
 106 #endif  // MEDIA_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_