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
18namespace webrtc {
19
20using std::complex;
21
22const size_t RealFourier::kFftBufferAlignment = 32;
23
24rtc::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
32int RealFourier::FftOrder(size_t length) {
33  RTC_CHECK_GT(length, 0U);
34  return WebRtcSpl_GetSizeInBits(static_cast<uint32_t>(length - 1));
35}
36
37size_t RealFourier::FftLength(int order) {
38  RTC_CHECK_GE(order, 0);
39  return static_cast<size_t>(1 << order);
40}
41
42size_t RealFourier::ComplexLength(int order) {
43  return FftLength(order) / 2 + 1;
44}
45
46RealFourier::fft_real_scoper RealFourier::AllocRealBuffer(int count) {
47  return fft_real_scoper(static_cast<float*>(
48      AlignedMalloc(sizeof(float) * count, kFftBufferAlignment)));
49}
50
51RealFourier::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