52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
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/*
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* Copyright (c) 2014 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 "common_audio/real_fourier.h"
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#include "common_audio/real_fourier_ooura.h"
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#include "common_audio/signal_processing/include/signal_processing_library.h"
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#include "rtc_base/checks.h"
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namespace webrtc {
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using std::complex;
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const size_t RealFourier::kFftBufferAlignment = 32;
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std::unique_ptr<RealFourier> RealFourier::Create(int fft_order) {
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return std::unique_ptr<RealFourier>(new RealFourierOoura(fft_order));
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}
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int RealFourier::FftOrder(size_t length) {
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RTC_CHECK_GT(length, 0U);
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return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1));
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}
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size_t RealFourier::FftLength(int order) {
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RTC_CHECK_GE(order, 0);
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return size_t{1} << order;
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}
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size_t RealFourier::ComplexLength(int order) {
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return FftLength(order) / 2 + 1;
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}
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RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) {
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return fft_real_scoper(static_cast<float*>(
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AlignedMalloc(sizeof(float) * count, kFftBufferAlignment)));
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}
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RealFourier::fft_cplx_scoper RealFourier::AllocCplxBuffer(int count) {
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return fft_cplx_scoper(static_cast<complex<float>*>(
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AlignedMalloc(sizeof(complex<float>) * count, kFftBufferAlignment)));
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}
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} // namespace webrtc
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