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 "webrtc/common_audio/real_fourier.h" 12 13 #include "webrtc/base/checks.h" 14 #include "webrtc/common_audio/real_fourier_ooura.h" 15 #include "webrtc/common_audio/real_fourier_openmax.h" 16 #include "webrtc/common_audio/signal_processing/include/spl_inl.h" 17 18 namespace webrtc { 19 20 using std::complex; 21 22 const size_t RealFourier::kFftBufferAlignment = 32; 23 24 rtc::scoped_ptr<RealFourier> RealFourier::Create(int fft_order) { 25 #if defined(RTC_USE_OPENMAX_DL) 26 return rtc::scoped_ptr<RealFourier>(new RealFourierOpenmax(fft_order)); 27 #else 28 return rtc::scoped_ptr<RealFourier>(new RealFourierOoura(fft_order)); 29 #endif 30 } 31 32 int RealFourier::FftOrder(size_t length) { 33 RTC_CHECK_GT(length, 0U); 34 return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1)); 35 } 36 37 size_t RealFourier::FftLength(int order) { 38 RTC_CHECK_GE(order, 0); 39 return static_cast<size_t>(1 << order); 40 } 41 42 size_t RealFourier::ComplexLength(int order) { 43 return FftLength(order) / 2 + 1; 44 } 45 46 RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) { 47 return fft_real_scoper(static_cast<float*>( 48 AlignedMalloc(sizeof(float) * count, kFftBufferAlignment))); 49 } 50 51 RealFourier::fft_cplx_scoper RealFourier::AllocCplxBuffer(int count) { 52 return fft_cplx_scoper(static_cast<complex<float>*>( 53 AlignedMalloc(sizeof(complex<float>) * count, kFftBufferAlignment))); 54 } 55 56 } // namespace webrtc 57 58
