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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 "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
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