Load CMA backend from shared library

chromecast/media/cma/backend/audio_pipeline_device.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_
-
-#include "base/macros.h"
-#include "chromecast/media/cma/backend/media_component_device.h"
-
-namespace chromecast {
-namespace media {
-class AudioPipelineDeviceClient;
-struct AudioConfig;
-
-class AudioPipelineDevice : public MediaComponentDevice {
- public:
-  AudioPipelineDevice();
-  ~AudioPipelineDevice() override;
-
-  // Provide the audio configuration.
-  // Must be called before switching from |kStateUninitialized| to |kStateIdle|.
-  // Afterwards, this can be invoked any time the configuration changes.
-  // Returns true if the configuration is a supported configuration.
-  virtual bool SetConfig(const AudioConfig& config) = 0;
-
-  // Sets the volume multiplier.
-  // The multiplier must be in the range [0.0, 1.0].
-  virtual void SetStreamVolumeMultiplier(float multiplier) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(AudioPipelineDevice);
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_AUDIO_PIPELINE_DEVICE_H_