59 lines
2.0 KiB
C++
59 lines
2.0 KiB
C++
/*
|
|
* 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_
|