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}
66 lines
2.0 KiB
C++
66 lines
2.0 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/erle_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 kMinErle = 1.f;
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constexpr float kMaxErle = 8.f;
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} // namespace
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ErleEstimator::ErleEstimator() {
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erle_.fill(kMinErle);
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hold_counters_.fill(0);
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}
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ErleEstimator::~ErleEstimator() = default;
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void ErleEstimator::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 std::array<float, kFftLengthBy2Plus1>& subtractor_spectrum) {
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const auto& X2 = render_spectrum;
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const auto& Y2 = capture_spectrum;
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const auto& E2 = subtractor_spectrum;
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// Corresponds of WGN of power -46 dBFS.
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constexpr float kX2Min = 44015068.0f;
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// Update the estimates in a clamped minimum statistics manner.
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for (size_t k = 1; k < kFftLengthBy2; ++k) {
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if (X2[k] > kX2Min && E2[k] > 0.f) {
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const float new_erle = Y2[k] / E2[k];
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if (new_erle > erle_[k]) {
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hold_counters_[k - 1] = 100;
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erle_[k] += 0.1f * (new_erle - erle_[k]);
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erle_[k] = std::max(kMinErle, std::min(erle_[k], kMaxErle));
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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(),
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erle_.begin() + 1, erle_.begin() + 1, [](int a, float b) {
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return a > 0 ? b : std::max(kMinErle, 0.97f * b);
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});
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erle_[0] = erle_[1];
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erle_[kFftLengthBy2] = erle_[kFftLengthBy2 - 1];
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}
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} // namespace webrtc
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