1 /*
2  *  Copyright (c) 2015 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 #ifndef WEBRTC_COMMON_AUDIO_REAL_FOURIER_OOURA_H_
12 #define WEBRTC_COMMON_AUDIO_REAL_FOURIER_OOURA_H_
13 
14 #include <complex>
15 
16 #include "webrtc/base/scoped_ptr.h"
17 #include "webrtc/common_audio/real_fourier.h"
18 
19 namespace webrtc {
20 
21 class RealFourierOoura : public RealFourier {
22  public:
23   explicit RealFourierOoura(int fft_order);
24 
25   void Forward(const float* src, std::complex<float>* dest) const override;
26   void Inverse(const std::complex<float>* src, float* dest) const override;
27 
order()28   int order() const override {
29     return order_;
30   }
31 
32  private:
33   const int order_;
34   const size_t length_;
35   const size_t complex_length_;
36   // These are work arrays for Ooura. The names are based on the comments in
37   // fft4g.c.
38   const rtc::scoped_ptr<size_t[]> work_ip_;
39   const rtc::scoped_ptr<float[]> work_w_;
40 };
41 
42 }  // namespace webrtc
43 
44 #endif  // WEBRTC_COMMON_AUDIO_REAL_FOURIER_OOURA_H_
45 
46