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   // |connection| is a pointer to the connection back to our embedder. The
  35   // embedder should have configured it (via ConfigureOutgoingConnection) to
  36   // allow |this| to connect to a sink that will receive decoded data ready
  37   // for playback.
  38   explicit MojoRendererService(mojo::ApplicationConnection* connection);
  39   ~MojoRendererService() override;
  40
  41   // mojo::MediaRenderer implementation.
  42   void Initialize(mojo::DemuxerStreamPtr audio,
  43                   mojo::DemuxerStreamPtr video,
  44                   const mojo::Closure& callback) override;
  45   void Flush(const mojo::Closure& callback) override;
  46   void StartPlayingFrom(int64_t time_delta_usec) override;
  47   void SetPlaybackRate(float playback_rate) override;
  48   void SetVolume(float volume) override;
  49
  50  private:
  51   enum State {
  52     STATE_UNINITIALIZED,
  53     STATE_INITIALIZING,
  54     STATE_FLUSHING,
  55     STATE_PLAYING,
  56     STATE_ERROR
  57   };
  58
  59   // Called when the MojoDemuxerStreamAdapter is ready to go (has a config,
  60   // pipe handle, etc) and can be handed off to a renderer for use.
  61   void OnStreamReady(const mojo::Closure& callback);
  62
  63   // Called when |audio_renderer_| initialization has completed.
  64   void OnRendererInitializeDone(const mojo::Closure& callback);
  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 SchedulePeriodicMediaTimeUpdates();
  74
  75   // Callback executed by audio renderer when buffering state changes.
  76   // TODO(tim): Need old and new.
  77   void OnBufferingStateChanged(BufferingState new_buffering_state);
  78
  79   // Callback executed when a renderer has ended.
  80   void OnRendererEnded();
  81
  82   // Callback executed when a runtime error happens.
  83   void OnError(PipelineStatus error);
  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::WeakPtrFactory<MojoRendererService> weak_factory_;
  95   base::WeakPtr<MojoRendererService> weak_this_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(MojoRendererService);
  98 };
  99
 100 }  // namespace media
 101
 102 #endif  // MEDIA_MOJO_SERVICES_MOJO_RENDERER_SERVICE_H_