1 /* 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "common_audio/real_fourier.h" 12 13 #include "common_audio/real_fourier_ooura.h" 14 #include "common_audio/signal_processing/include/signal_processing_library.h" 15 #include "rtc_base/checks.h" 16 17 namespace webrtc { 18 19 using std::complex; 20 21 const size_t RealFourier::kFftBufferAlignment = 32; 22 Create(int fft_order)23std::unique_ptr<RealFourier> RealFourier::Create(int fft_order) { 24 return std::unique_ptr<RealFourier>(new RealFourierOoura(fft_order)); 25 } 26 FftOrder(size_t length)27int RealFourier::FftOrder(size_t length) { 28 RTC_CHECK_GT(length, 0U); 29 return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1)); 30 } 31 FftLength(int order)32size_t RealFourier::FftLength(int order) { 33 RTC_CHECK_GE(order, 0); 34 return size_t{1} << order; 35 } 36 ComplexLength(int order)37size_t RealFourier::ComplexLength(int order) { 38 return FftLength(order) / 2 + 1; 39 } 40 AllocRealBuffer(int count)41RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) { 42 return fft_real_scoper(static_cast<float*>( 43 AlignedMalloc(sizeof(float) * count, kFftBufferAlignment))); 44 } 45 AllocCplxBuffer(int count)46RealFourier::fft_cplx_scoper RealFourier::AllocCplxBuffer(int count) { 47 return fft_cplx_scoper(static_cast<complex<float>*>( 48 AlignedMalloc(sizeof(complex<float>) * count, kFftBufferAlignment))); 49 } 50 51 } // namespace webrtc 52