Chromecast: adds a media pipeline feeding data to CMA device backends.

chromecast/media/cma/pipeline/audio_pipeline.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_PIPELINE_AUDIO_PIPELINE_H_
+#define CHROMECAST_MEDIA_CMA_PIPELINE_AUDIO_PIPELINE_H_
+
+#include "base/macros.h"
+#include "chromecast/media/cma/pipeline/av_pipeline_client.h"
+
+namespace chromecast {
+namespace media {
+
+class AudioPipeline {
+ public:
+  AudioPipeline();
+  virtual ~AudioPipeline();
+
+  // Set the audio client.
+  virtual void SetClient(const AvPipelineClient& client) = 0;
+
+  // Set the stream volume.
+  // - A value of 1.0 is the neutral value.
+  // - |volume|=0.0 mutes the stream.
+  virtual void SetVolume(float volume) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AudioPipeline);
+};
+
+}  // namespace media
+}  // namespace chromecast
+
+#endif  // CHROMECAST_MEDIA_CMA_PIPELINE_AUDIO_PIPELINE_H_