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/*
* 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 MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
#define MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
#include <vector>
#include "api/array_view.h"
#include "api/audio/echo_canceller3_config.h"
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
// Performs channel conversion to mono for the purpose of providing a decent
// mono input for the delay estimation. This is achieved by analyzing all
// incoming channels and produce one single channel output.
class AlignmentMixer {
public:
AlignmentMixer(size_t num_channels,
const EchoCanceller3Config::Delay::AlignmentMixing& config);
AlignmentMixer(size_t num_channels,
bool downmix,
bool adaptive_selection,
float excitation_limit,
bool prefer_first_two_channels);
void ProduceOutput(rtc::ArrayView<const std::vector<float>> x,
rtc::ArrayView<float, kBlockSize> y);
enum class MixingVariant { kDownmix, kAdaptive, kFixed };
private:
const size_t num_channels_;
const float one_by_num_channels_;
const float excitation_energy_threshold_;
const bool prefer_first_two_channels_;
const MixingVariant selection_variant_;
std::array<size_t, 2> strong_block_counters_;
std::vector<float> cumulative_energies_;
int selected_channel_ = 0;
size_t block_counter_ = 0;
void Downmix(const rtc::ArrayView<const std::vector<float>> x,
rtc::ArrayView<float, kBlockSize> y) const;
int SelectChannel(rtc::ArrayView<const std::vector<float>> x);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
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