chromium/third_party/webrtc/audio/utility/channel_mixer.h

/*
 *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef AUDIO_UTILITY_CHANNEL_MIXER_H_
#define AUDIO_UTILITY_CHANNEL_MIXER_H_

#include <stddef.h>
#include <stdint.h>

#include <memory>
#include <vector>

#include "api/audio/audio_frame.h"
#include "api/audio/channel_layout.h"

namespace webrtc {

// ChannelMixer is for converting audio between channel layouts.  The conversion
// matrix is built upon construction and used during each Transform() call.  The
// algorithm works by generating a conversion matrix mapping each output channel
// to list of input channels.  The transform renders all of the output channels,
// with each output channel rendered according to a weighted sum of the relevant
// input channels as defined in the matrix.
// This file is derived from Chromium's media/base/channel_mixer.h.
class ChannelMixer { … };

}  // namespace webrtc

#endif  // AUDIO_UTILITY_CHANNEL_MIXER_H_