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