58 lines
2.0 KiB
C
58 lines
2.0 KiB
C
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/*
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* Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
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#define MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
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#include <vector>
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#include "api/array_view.h"
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#include "api/audio/echo_canceller3_config.h"
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#include "modules/audio_processing/aec3/aec3_common.h"
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#include "modules/audio_processing/aec3/block.h"
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namespace webrtc {
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// Performs channel conversion to mono for the purpose of providing a decent
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// mono input for the delay estimation. This is achieved by analyzing all
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// incoming channels and produce one single channel output.
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class AlignmentMixer {
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public:
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AlignmentMixer(size_t num_channels,
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const EchoCanceller3Config::Delay::AlignmentMixing& config);
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AlignmentMixer(size_t num_channels,
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bool downmix,
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bool adaptive_selection,
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float excitation_limit,
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bool prefer_first_two_channels);
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void ProduceOutput(const Block& x, rtc::ArrayView<float, kBlockSize> y);
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enum class MixingVariant { kDownmix, kAdaptive, kFixed };
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private:
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const size_t num_channels_;
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const float one_by_num_channels_;
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const float excitation_energy_threshold_;
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const bool prefer_first_two_channels_;
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const MixingVariant selection_variant_;
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std::array<size_t, 2> strong_block_counters_;
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std::vector<float> cumulative_energies_;
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int selected_channel_ = 0;
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size_t block_counter_ = 0;
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void Downmix(const Block& x, rtc::ArrayView<float, kBlockSize> y) const;
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int SelectChannel(const Block& x);
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AEC3_ALIGNMENT_MIXER_H_
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