chromecast/public/media/audio_pipeline_device.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 CHROMECAST_PUBLIC_MEDIA_AUDIO_PIPELINE_DEVICE_H_
   6 #define CHROMECAST_PUBLIC_MEDIA_AUDIO_PIPELINE_DEVICE_H_
   7
   8 #include "media_component_device.h"
   9
  10 namespace chromecast {
  11 namespace media {
  12 class AudioPipelineDeviceClient;
  13 struct AudioConfig;
  14
  15 // Interface for platform-specific audio pipeline backend.
  16 // See comments on MediaComponentDevice.
  17 class AudioPipelineDevice : public MediaComponentDevice {
  18  public:
  19   ~AudioPipelineDevice() override {}
  20
  21   // Provides the audio configuration.
  22   // Will be called before switching from |kStateUninitialized| to |kStateIdle|.
  23   // Afterwards, this can be invoked any time the configuration changes.
  24   // Returns true if the configuration is a supported configuration.
  25   virtual bool SetConfig(const AudioConfig& config) = 0;
  26
  27   // Sets the volume multiplier.
  28   // The multiplier is in the range [0.0, 1.0].
  29   virtual void SetStreamVolumeMultiplier(float multiplier) = 0;
  30 };
  31
  32 }  // namespace media
  33 }  // namespace chromecast
  34
  35 #endif  // CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_