522d71bf36
This CL adds the remaining code for the first version of EchoCanceller3. TBR=aleloi@webrtc.org BUG=webrtc:6018 Review-Url: https://codereview.webrtc.org/2678423005 Cr-Commit-Position: refs/heads/master@{#16801}
64 lines
1.8 KiB
C++
64 lines
1.8 KiB
C++
/*
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* Copyright (c) 2017 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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#include "webrtc/modules/audio_processing/aec3/erl_estimator.h"
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#include <algorithm>
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namespace webrtc {
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namespace {
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constexpr float kMinErl = 0.01f;
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constexpr float kMaxErl = 1000.f;
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} // namespace
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ErlEstimator::ErlEstimator() {
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erl_.fill(kMaxErl);
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hold_counters_.fill(0);
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}
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ErlEstimator::~ErlEstimator() = default;
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void ErlEstimator::Update(
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const std::array<float, kFftLengthBy2Plus1>& render_spectrum,
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const std::array<float, kFftLengthBy2Plus1>& capture_spectrum) {
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const auto& X2 = render_spectrum;
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const auto& Y2 = capture_spectrum;
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// Corresponds to WGN of power -46 dBFS.
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constexpr float kX2Min = 44015068.0f;
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// Update the estimates in a maximum statistics manner.
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for (size_t k = 1; k < kFftLengthBy2; ++k) {
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if (X2[k] > kX2Min) {
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const float new_erl = Y2[k] / X2[k];
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if (new_erl < erl_[k]) {
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hold_counters_[k - 1] = 1000;
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erl_[k] += 0.1 * (new_erl - erl_[k]);
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erl_[k] = std::max(erl_[k], kMinErl);
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}
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}
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}
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std::for_each(hold_counters_.begin(), hold_counters_.end(),
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[](int& a) { --a; });
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std::transform(hold_counters_.begin(), hold_counters_.end(), erl_.begin() + 1,
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erl_.begin() + 1, [](int a, float b) {
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return a > 0 ? b : std::min(kMaxErl, 2.f * b);
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});
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erl_[0] = erl_[1];
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erl_[kFftLengthBy2] = erl_[kFftLengthBy2 - 1];
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}
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} // namespace webrtc
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