Implement runtime audio post-processing pipeline. See go/cast_audio.json

chromecast/media/cma/backend/alsa/audio_filter_interface.h

-// Copyright 2016 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_ALSA_AUDIO_FILTER_INTERFACE_H_
-#define CHROMECAST_MEDIA_CMA_BACKEND_ALSA_AUDIO_FILTER_INTERFACE_H_
-
-#include <stdint.h>
-
-#include "media/base/sample_format.h"
-
-namespace chromecast {
-namespace media {
-
-class AudioFilterInterface {
- public:
-  virtual ~AudioFilterInterface() = default;
-  virtual bool SetSampleRateAndFormat(int sample_rate,
-                                      ::media::SampleFormat sample_format) = 0;
-
-  // Process data frames. Must be interleaved. |data| will be overwritten.
-  virtual bool ProcessInterleaved(uint8_t* data, int frames, float volume) = 0;
-};
-
-}  // namespace media
-}  // namespace chromecast
-
-#endif  // CHROMECAST_MEDIA_CMA_BACKEND_ALSA_AUDIO_FILTER_INTERFACE_H_