| /* |
| * 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 "webrtc/common_audio/real_fourier.h" |
| |
| #include <cstdlib> |
| |
| #include "third_party/openmax_dl/dl/sp/api/omxSP.h" |
| #include "webrtc/base/checks.h" |
| |
| namespace webrtc { |
| |
| using std::complex; |
| |
| // The omx implementation uses this macro to check order validity. |
| const int RealFourier::kMaxFftOrder = TWIDDLE_TABLE_ORDER; |
| const int RealFourier::kFftBufferAlignment = 32; |
| |
| RealFourier::RealFourier(int fft_order) |
| : order_(fft_order), |
| omx_spec_(nullptr) { |
| CHECK_GE(order_, 1); |
| CHECK_LE(order_, kMaxFftOrder); |
| |
| OMX_INT buffer_size; |
| OMXResult r; |
| |
| r = omxSP_FFTGetBufSize_R_F32(order_, &buffer_size); |
| CHECK_EQ(r, OMX_Sts_NoErr); |
| |
| omx_spec_ = malloc(buffer_size); |
| DCHECK(omx_spec_); |
| |
| r = omxSP_FFTInit_R_F32(omx_spec_, order_); |
| CHECK_EQ(r, OMX_Sts_NoErr); |
| } |
| |
| RealFourier::~RealFourier() { |
| free(omx_spec_); |
| } |
| |
| int RealFourier::FftOrder(int length) { |
| for (int order = 0; order <= kMaxFftOrder; order++) { |
| if ((1 << order) >= length) { |
| return order; |
| } |
| } |
| return -1; |
| } |
| |
| int RealFourier::ComplexLength(int order) { |
| CHECK_LE(order, kMaxFftOrder); |
| CHECK_GT(order, 0); |
| return (1 << 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))); |
| } |
| |
| void RealFourier::Forward(const float* src, complex<float>* dest) const { |
| OMXResult r; |
| r = omxSP_FFTFwd_RToCCS_F32(src, reinterpret_cast<OMX_F32*>(dest), omx_spec_); |
| CHECK_EQ(r, OMX_Sts_NoErr); |
| } |
| |
| void RealFourier::Inverse(const complex<float>* src, float* dest) const { |
| OMXResult r; |
| r = omxSP_FFTInv_CCSToR_F32(reinterpret_cast<const OMX_F32*>(src), dest, |
| omx_spec_); |
| CHECK_EQ(r, OMX_Sts_NoErr); |
| } |
| |
| } // namespace webrtc |
| |