media/mojo/services/renderer_config.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_RENDERER_CONFIG_H_
   6 #define MEDIA_MOJO_SERVICES_RENDERER_CONFIG_H_
   7
   8 #include "base/lazy_instance.h"
   9 #include "base/memory/scoped_vector.h"
  10 #include "base/single_thread_task_runner.h"
  11 #include "media/base/audio_decoder.h"
  12 #include "media/base/audio_hardware_config.h"
  13 #include "media/base/audio_renderer_sink.h"
  14 #include "media/base/media_log.h"
  15 #include "media/base/video_decoder.h"
  16
  17 namespace media {
  18
  19 // Interface class which clients will extend to override (at compile time) the
  20 // default audio or video rendering configurations for MojoRendererService.
  21 class PlatformRendererConfig {
  22  public:
  23   virtual ~PlatformRendererConfig() {};
  24
  25   // The list of audio or video decoders for use with the AudioRenderer or
  26   // VideoRenderer respectively.  Ownership of the decoders is passed to the
  27   // caller.  The methods on each decoder will only be called on
  28   // |media_task_runner|.  |media_log_cb| should be used to log errors or
  29   // important status information.
  30   virtual ScopedVector<AudioDecoder> GetAudioDecoders(
  31       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
  32       const LogCB& media_log_cb) = 0;
  33   virtual ScopedVector<VideoDecoder> GetVideoDecoders(
  34       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
  35       const LogCB& media_log_cb) = 0;
  36
  37   // The audio output sink used for rendering audio.
  38   virtual scoped_refptr<AudioRendererSink> GetAudioRendererSink() = 0;
  39
  40   // The platform's audio hardware configuration.  Note, this must remain
  41   // constant for the lifetime of the PlatformRendererConfig.
  42   virtual const AudioHardwareConfig& GetAudioHardwareConfig() = 0;
  43
  44 };
  45
  46 class RendererConfig {
  47  public:
  48   // Returns an instance of the RenderConfig object.  Only one instance will
  49   // exist per process.
  50   static RendererConfig* Get();
  51
  52   // Copy of the PlatformRendererConfig interface.
  53   ScopedVector<AudioDecoder> GetAudioDecoders(
  54       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
  55       const LogCB& media_log_cb);
  56   ScopedVector<VideoDecoder> GetVideoDecoders(
  57       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
  58       const LogCB& media_log_cb);
  59   scoped_refptr<AudioRendererSink> GetAudioRendererSink();
  60   const AudioHardwareConfig& GetAudioHardwareConfig();
  61
  62  private:
  63   friend struct base::DefaultLazyInstanceTraits<RendererConfig>;
  64
  65   RendererConfig();
  66   ~RendererConfig();
  67
  68   scoped_ptr<PlatformRendererConfig> renderer_config_;
  69
  70   DISALLOW_COPY_AND_ASSIGN(RendererConfig);
  71 };
  72
  73 }  // namespace media
  74
  75 #endif  // MEDIA_MOJO_SERVICES_RENDERER_CONFIG_H_