Chromecast: adds interfaces for hardware layer of CMA pipeline.

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 media {
+class AudioDecoderConfig;
+}
+
+namespace chromecast {
+namespace media {
+class AudioPipelineDeviceClient;
+
+class AudioPipelineDevice : public MediaComponentDevice {
+ public:
+  AudioPipelineDevice();
+  virtual ~AudioPipelineDevice();
+
+  // 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 ::media::AudioDecoderConfig& 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_