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| 1 /* | 1 /* | 
| 2  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | 2  *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved. | 
| 3  * | 3  * | 
| 4  *  Use of this source code is governed by a BSD-style license | 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 | 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 | 6  *  tree. An additional intellectual property rights grant can be found | 
| 7  *  in the file PATENTS.  All contributing project authors may | 7  *  in the file PATENTS.  All contributing project authors may | 
| 8  *  be found in the AUTHORS file in the root of the source tree. | 8  *  be found in the AUTHORS file in the root of the source tree. | 
| 9  */ | 9  */ | 
| 10 | 10 | 
| 11 #include "webrtc/common_audio/real_fourier_ooura.h" | 11 #include "webrtc/common_audio/real_fourier_ooura.h" | 
| 12 | 12 | 
| 13 #include <cmath> | 13 #include <cmath> | 
| 14 #include <algorithm> | 14 #include <algorithm> | 
| 15 | 15 | 
| 16 #include "webrtc/base/checks.h" |  | 
| 17 #include "webrtc/common_audio/fft4g.h" | 16 #include "webrtc/common_audio/fft4g.h" | 
|  | 17 #include "webrtc/rtc_base/checks.h" | 
| 18 | 18 | 
| 19 namespace webrtc { | 19 namespace webrtc { | 
| 20 | 20 | 
| 21 using std::complex; | 21 using std::complex; | 
| 22 | 22 | 
| 23 namespace { | 23 namespace { | 
| 24 | 24 | 
| 25 void Conjugate(complex<float>* array, size_t complex_length) { | 25 void Conjugate(complex<float>* array, size_t complex_length) { | 
| 26   std::for_each(array, array + complex_length, | 26   std::for_each(array, array + complex_length, | 
| 27                 [=](complex<float>& v) { v = std::conj(v); }); | 27                 [=](complex<float>& v) { v = std::conj(v); }); | 
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| 76   } | 76   } | 
| 77 | 77 | 
| 78   WebRtc_rdft(length_, -1, dest, work_ip_.get(), work_w_.get()); | 78   WebRtc_rdft(length_, -1, dest, work_ip_.get(), work_w_.get()); | 
| 79 | 79 | 
| 80   // Ooura returns a scaled version. | 80   // Ooura returns a scaled version. | 
| 81   const float scale = 2.0f / length_; | 81   const float scale = 2.0f / length_; | 
| 82   std::for_each(dest, dest + length_, [scale](float& v) { v *= scale; }); | 82   std::for_each(dest, dest + length_, [scale](float& v) { v *= scale; }); | 
| 83 } | 83 } | 
| 84 | 84 | 
| 85 }  // namespace webrtc | 85 }  // namespace webrtc | 
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