| /* |
| * Copyright (c) 2017 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. |
| */ |
| |
| #include "modules/audio_processing/aec3/aec3_fft.h" |
| |
| #include <algorithm> |
| #include <functional> |
| #include <iterator> |
| |
| #include "rtc_base/checks.h" |
| #include "system_wrappers/include/cpu_features_wrapper.h" |
| |
| namespace webrtc { |
| |
| namespace { |
| |
| const float kHanning64[kFftLengthBy2] = { |
| 0.f, 0.00248461f, 0.00991376f, 0.0222136f, 0.03926189f, |
| 0.06088921f, 0.08688061f, 0.11697778f, 0.15088159f, 0.1882551f, |
| 0.22872687f, 0.27189467f, 0.31732949f, 0.36457977f, 0.41317591f, |
| 0.46263495f, 0.51246535f, 0.56217185f, 0.61126047f, 0.65924333f, |
| 0.70564355f, 0.75f, 0.79187184f, 0.83084292f, 0.86652594f, |
| 0.89856625f, 0.92664544f, 0.95048443f, 0.96984631f, 0.98453864f, |
| 0.99441541f, 0.99937846f, 0.99937846f, 0.99441541f, 0.98453864f, |
| 0.96984631f, 0.95048443f, 0.92664544f, 0.89856625f, 0.86652594f, |
| 0.83084292f, 0.79187184f, 0.75f, 0.70564355f, 0.65924333f, |
| 0.61126047f, 0.56217185f, 0.51246535f, 0.46263495f, 0.41317591f, |
| 0.36457977f, 0.31732949f, 0.27189467f, 0.22872687f, 0.1882551f, |
| 0.15088159f, 0.11697778f, 0.08688061f, 0.06088921f, 0.03926189f, |
| 0.0222136f, 0.00991376f, 0.00248461f, 0.f}; |
| |
| // Hanning window from Matlab command win = sqrt(hanning(128)). |
| const float kSqrtHanning128[kFftLength] = { |
| 0.00000000000000f, 0.02454122852291f, 0.04906767432742f, 0.07356456359967f, |
| 0.09801714032956f, 0.12241067519922f, 0.14673047445536f, 0.17096188876030f, |
| 0.19509032201613f, 0.21910124015687f, 0.24298017990326f, 0.26671275747490f, |
| 0.29028467725446f, 0.31368174039889f, 0.33688985339222f, 0.35989503653499f, |
| 0.38268343236509f, 0.40524131400499f, 0.42755509343028f, 0.44961132965461f, |
| 0.47139673682600f, 0.49289819222978f, 0.51410274419322f, 0.53499761988710f, |
| 0.55557023301960f, 0.57580819141785f, 0.59569930449243f, 0.61523159058063f, |
| 0.63439328416365f, 0.65317284295378f, 0.67155895484702f, 0.68954054473707f, |
| 0.70710678118655f, 0.72424708295147f, 0.74095112535496f, 0.75720884650648f, |
| 0.77301045336274f, 0.78834642762661f, 0.80320753148064f, 0.81758481315158f, |
| 0.83146961230255f, 0.84485356524971f, 0.85772861000027f, 0.87008699110871f, |
| 0.88192126434835f, 0.89322430119552f, 0.90398929312344f, 0.91420975570353f, |
| 0.92387953251129f, 0.93299279883474f, 0.94154406518302f, 0.94952818059304f, |
| 0.95694033573221f, 0.96377606579544f, 0.97003125319454f, 0.97570213003853f, |
| 0.98078528040323f, 0.98527764238894f, 0.98917650996478f, 0.99247953459871f, |
| 0.99518472667220f, 0.99729045667869f, 0.99879545620517f, 0.99969881869620f, |
| 1.00000000000000f, 0.99969881869620f, 0.99879545620517f, 0.99729045667869f, |
| 0.99518472667220f, 0.99247953459871f, 0.98917650996478f, 0.98527764238894f, |
| 0.98078528040323f, 0.97570213003853f, 0.97003125319454f, 0.96377606579544f, |
| 0.95694033573221f, 0.94952818059304f, 0.94154406518302f, 0.93299279883474f, |
| 0.92387953251129f, 0.91420975570353f, 0.90398929312344f, 0.89322430119552f, |
| 0.88192126434835f, 0.87008699110871f, 0.85772861000027f, 0.84485356524971f, |
| 0.83146961230255f, 0.81758481315158f, 0.80320753148064f, 0.78834642762661f, |
| 0.77301045336274f, 0.75720884650648f, 0.74095112535496f, 0.72424708295147f, |
| 0.70710678118655f, 0.68954054473707f, 0.67155895484702f, 0.65317284295378f, |
| 0.63439328416365f, 0.61523159058063f, 0.59569930449243f, 0.57580819141785f, |
| 0.55557023301960f, 0.53499761988710f, 0.51410274419322f, 0.49289819222978f, |
| 0.47139673682600f, 0.44961132965461f, 0.42755509343028f, 0.40524131400499f, |
| 0.38268343236509f, 0.35989503653499f, 0.33688985339222f, 0.31368174039889f, |
| 0.29028467725446f, 0.26671275747490f, 0.24298017990326f, 0.21910124015687f, |
| 0.19509032201613f, 0.17096188876030f, 0.14673047445536f, 0.12241067519922f, |
| 0.09801714032956f, 0.07356456359967f, 0.04906767432742f, 0.02454122852291f}; |
| |
| bool IsSse2Available() { |
| #if defined(WEBRTC_ARCH_X86_FAMILY) |
| return GetCPUInfo(kSSE2) != 0; |
| #else |
| return false; |
| #endif |
| } |
| |
| } // namespace |
| |
| Aec3Fft::Aec3Fft() : ooura_fft_(IsSse2Available()) {} |
| |
| // TODO(peah): Change x to be std::array once the rest of the code allows this. |
| void Aec3Fft::ZeroPaddedFft(rtc::ArrayView<const float> x, |
| Window window, |
| FftData* X) const { |
| RTC_DCHECK(X); |
| RTC_DCHECK_EQ(kFftLengthBy2, x.size()); |
| std::array<float, kFftLength> fft; |
| std::fill(fft.begin(), fft.begin() + kFftLengthBy2, 0.f); |
| switch (window) { |
| case Window::kRectangular: |
| std::copy(x.begin(), x.end(), fft.begin() + kFftLengthBy2); |
| break; |
| case Window::kHanning: |
| std::transform(x.begin(), x.end(), std::begin(kHanning64), |
| fft.begin() + kFftLengthBy2, |
| [](float a, float b) { return a * b; }); |
| break; |
| case Window::kSqrtHanning: |
| RTC_DCHECK_NOTREACHED(); |
| break; |
| default: |
| RTC_DCHECK_NOTREACHED(); |
| } |
| |
| Fft(&fft, X); |
| } |
| |
| void Aec3Fft::PaddedFft(rtc::ArrayView<const float> x, |
| rtc::ArrayView<const float> x_old, |
| Window window, |
| FftData* X) const { |
| RTC_DCHECK(X); |
| RTC_DCHECK_EQ(kFftLengthBy2, x.size()); |
| RTC_DCHECK_EQ(kFftLengthBy2, x_old.size()); |
| std::array<float, kFftLength> fft; |
| |
| switch (window) { |
| case Window::kRectangular: |
| std::copy(x_old.begin(), x_old.end(), fft.begin()); |
| std::copy(x.begin(), x.end(), fft.begin() + x_old.size()); |
| break; |
| case Window::kHanning: |
| RTC_DCHECK_NOTREACHED(); |
| break; |
| case Window::kSqrtHanning: |
| std::transform(x_old.begin(), x_old.end(), std::begin(kSqrtHanning128), |
| fft.begin(), std::multiplies<float>()); |
| std::transform(x.begin(), x.end(), |
| std::begin(kSqrtHanning128) + x_old.size(), |
| fft.begin() + x_old.size(), std::multiplies<float>()); |
| break; |
| default: |
| RTC_DCHECK_NOTREACHED(); |
| } |
| |
| Fft(&fft, X); |
| } |
| |
| } // namespace webrtc |