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/macros.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "base/timer/timer.h"
  13 #include "media/base/audio_decoder_config.h"
  14 #include "media/base/buffering_state.h"
  15 #include "media/base/pipeline_status.h"
  16 #include "media/mojo/interfaces/media_renderer.mojom.h"
  17 #include "mojo/public/cpp/bindings/interface_impl.h"
  18
  19 namespace mojo {
  20 class ApplicationConnection;
  21 }
  22
  23 namespace media {
  24
  25 class AudioRendererSink;
  26 class DemuxerStreamProviderShim;
  27 class MojoDemuxerStreamAdapter;
  28 class Renderer;
  29
  30 // A mojo::MediaRenderer implementation that uses media::AudioRenderer to
  31 // decode and render audio to a sink obtained from the ApplicationConnection.
  32 class MojoRendererService : public mojo::InterfaceImpl<mojo::MediaRenderer> {
  33  public:
  34   MojoRendererService();
  35   ~MojoRendererService() override;
  36
  37   // mojo::MediaRenderer implementation.
  38   void Initialize(mojo::DemuxerStreamPtr audio,
  39                   mojo::DemuxerStreamPtr video,
  40                   const mojo::Closure& callback) override;
  41   void Flush(const mojo::Closure& callback) override;
  42   void StartPlayingFrom(int64_t time_delta_usec) override;
  43   void SetPlaybackRate(float playback_rate) override;
  44   void SetVolume(float volume) override;
  45
  46  private:
  47   enum State {
  48     STATE_UNINITIALIZED,
  49     STATE_INITIALIZING,
  50     STATE_FLUSHING,
  51     STATE_PLAYING,
  52     STATE_ERROR
  53   };
  54
  55   // Called when the MojoDemuxerStreamAdapter is ready to go (has a config,
  56   // pipe handle, etc) and can be handed off to a renderer for use.
  57   void OnStreamReady(const mojo::Closure& callback);
  58
  59   // Called when |audio_renderer_| initialization has completed.
  60   void OnRendererInitializeDone(const mojo::Closure& callback);
  61
  62   // Callback executed by filters to update statistics.
  63   void OnUpdateStatistics(const PipelineStatistics& stats);
  64
  65   // Periodically polls the media time from the renderer and notifies the client
  66   // if the media time has changed since the last update.  If |force| is true,
  67   // the client is notified even if the time is unchanged.
  68   void UpdateMediaTime(bool force);
  69   void CancelPeriodicMediaTimeUpdates();
  70   void SchedulePeriodicMediaTimeUpdates();
  71
  72   // Callback executed by audio renderer when buffering state changes.
  73   // TODO(tim): Need old and new.
  74   void OnBufferingStateChanged(BufferingState new_buffering_state);
  75
  76   // Callback executed when a renderer has ended.
  77   void OnRendererEnded();
  78
  79   // Callback executed when a runtime error happens.
  80   void OnError(PipelineStatus error);
  81
  82   // Callback executed once Flush() completes.
  83   void OnFlushCompleted(const mojo::Closure& callback);
  84
  85   State state_;
  86
  87   scoped_refptr<AudioRendererSink> audio_renderer_sink_;
  88   scoped_ptr<Renderer> renderer_;
  89   scoped_ptr<DemuxerStreamProviderShim> stream_provider_;
  90
  91   base::RepeatingTimer<MojoRendererService> time_update_timer_;
  92   uint64_t last_media_time_usec_;
  93
  94   base::WeakPtr<MojoRendererService> weak_this_;
  95   base::WeakPtrFactory<MojoRendererService> weak_factory_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(MojoRendererService);
  98 };
  99
 100 }  // namespace media
 101
 102 #endif  // MEDIA_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_