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d20639f1f6
This CL adds an nonwindowed spectrum of the linear filter error to use in the NLP computation. Bug: webrtc:8661 Change-Id: I45bc9bb3eb8eeac0c5d6adb414638eb12b635a27 Reviewed-on: https://webrtc-review.googlesource.com/38701 Reviewed-by: Gustaf Ullberg <gustaf@webrtc.org> Commit-Queue: Per Åhgren <peah@webrtc.org> Cr-Commit-Position: refs/heads/master@{#21583}
75 lines
2.7 KiB
C++
75 lines
2.7 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 "modules/audio_processing/aec3/aec3_fft.h"
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#include <algorithm>
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#include "rtc_base/checks.h"
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namespace webrtc {
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namespace {
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const float kHanning64[kFftLengthBy2] = {
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0.f, 0.00248461f, 0.00991376f, 0.0222136f, 0.03926189f,
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0.06088921f, 0.08688061f, 0.11697778f, 0.15088159f, 0.1882551f,
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0.22872687f, 0.27189467f, 0.31732949f, 0.36457977f, 0.41317591f,
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0.46263495f, 0.51246535f, 0.56217185f, 0.61126047f, 0.65924333f,
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0.70564355f, 0.75f, 0.79187184f, 0.83084292f, 0.86652594f,
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0.89856625f, 0.92664544f, 0.95048443f, 0.96984631f, 0.98453864f,
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0.99441541f, 0.99937846f, 0.99937846f, 0.99441541f, 0.98453864f,
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0.96984631f, 0.95048443f, 0.92664544f, 0.89856625f, 0.86652594f,
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0.83084292f, 0.79187184f, 0.75f, 0.70564355f, 0.65924333f,
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0.61126047f, 0.56217185f, 0.51246535f, 0.46263495f, 0.41317591f,
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0.36457977f, 0.31732949f, 0.27189467f, 0.22872687f, 0.1882551f,
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0.15088159f, 0.11697778f, 0.08688061f, 0.06088921f, 0.03926189f,
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0.0222136f, 0.00991376f, 0.00248461f, 0.f};
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} // namespace
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// TODO(peah): Change x to be std::array once the rest of the code allows this.
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void Aec3Fft::ZeroPaddedFft(rtc::ArrayView<const float> x,
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Window window,
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FftData* X) const {
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RTC_DCHECK(X);
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RTC_DCHECK_EQ(kFftLengthBy2, x.size());
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std::array<float, kFftLength> fft;
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std::fill(fft.begin(), fft.begin() + kFftLengthBy2, 0.f);
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switch (window) {
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case Window::kRectangular:
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std::copy(x.begin(), x.end(), fft.begin() + kFftLengthBy2);
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break;
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case Window::kHanning:
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std::transform(x.begin(), x.end(), std::begin(kHanning64),
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fft.begin() + kFftLengthBy2,
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[](float a, float b) { return a * b; });
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break;
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default:
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RTC_NOTREACHED();
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}
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Fft(&fft, X);
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}
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void Aec3Fft::PaddedFft(rtc::ArrayView<const float> x,
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rtc::ArrayView<float> x_old,
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FftData* X) const {
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RTC_DCHECK(X);
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RTC_DCHECK_EQ(kFftLengthBy2, x.size());
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RTC_DCHECK_EQ(kFftLengthBy2, x_old.size());
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std::array<float, kFftLength> fft;
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std::copy(x_old.begin(), x_old.end(), fft.begin());
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std::copy(x.begin(), x.end(), fft.begin() + x_old.size());
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std::copy(x.begin(), x.end(), x_old.begin());
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Fft(&fft, X);
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}
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} // namespace webrtc
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