diff options
Diffstat (limited to 'third_party/libwebrtc/common_audio/real_fourier.cc')
-rw-r--r-- | third_party/libwebrtc/common_audio/real_fourier.cc | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/real_fourier.cc b/third_party/libwebrtc/common_audio/real_fourier.cc new file mode 100644 index 0000000000..7365844e8d --- /dev/null +++ b/third_party/libwebrtc/common_audio/real_fourier.cc @@ -0,0 +1,51 @@ +/* + * 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 |