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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
| 6 * are met: | 6 * are met: |
| 7 * | 7 * |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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| 110 vDSP_fft_zrip(m_FFTSetup, &m_frame, 1, m_log2FFTSize, FFT_FORWARD); | 110 vDSP_fft_zrip(m_FFTSetup, &m_frame, 1, m_log2FFTSize, FFT_FORWARD); |
| 111 } | 111 } |
| 112 | 112 |
| 113 void FFTFrame::doInverseFFT(float* data) | 113 void FFTFrame::doInverseFFT(float* data) |
| 114 { | 114 { |
| 115 vDSP_fft_zrip(m_FFTSetup, &m_frame, 1, m_log2FFTSize, FFT_INVERSE); | 115 vDSP_fft_zrip(m_FFTSetup, &m_frame, 1, m_log2FFTSize, FFT_INVERSE); |
| 116 vDSP_ztoc(&m_frame, 1, (DSPComplex*)data, 2, m_FFTSize / 2); | 116 vDSP_ztoc(&m_frame, 1, (DSPComplex*)data, 2, m_FFTSize / 2); |
| 117 | 117 |
| 118 // Do final scaling so that x == IFFT(FFT(x)) | 118 // Do final scaling so that x == IFFT(FFT(x)) |
| 119 float scale = 1.0f / m_FFTSize; | 119 float scale = 1.0f / m_FFTSize; |
| 120 vDSP_vsmul(data, 1, &scale, data, 1, m_FFTSize); | 120 VectorMath::vsmul(data, 1, &scale, data, 1, m_FFTSize); |
| 121 } | 121 } |
| 122 | 122 |
| 123 FFTSetup FFTFrame::fftSetupForSize(unsigned fftSize) | 123 FFTSetup FFTFrame::fftSetupForSize(unsigned fftSize) |
| 124 { | 124 { |
| 125 if (!fftSetups) { | 125 if (!fftSetups) { |
| 126 fftSetups = (FFTSetup*)malloc(sizeof(FFTSetup) * kMaxFFTPow2Size); | 126 fftSetups = (FFTSetup*)malloc(sizeof(FFTSetup) * kMaxFFTPow2Size); |
| 127 memset(fftSetups, 0, sizeof(FFTSetup) * kMaxFFTPow2Size); | 127 memset(fftSetups, 0, sizeof(FFTSetup) * kMaxFFTPow2Size); |
| 128 } | 128 } |
| 129 | 129 |
| 130 int pow2size = static_cast<int>(log2(fftSize)); | 130 int pow2size = static_cast<int>(log2(fftSize)); |
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| 161 float* FFTFrame::imagData() const | 161 float* FFTFrame::imagData() const |
| 162 { | 162 { |
| 163 return m_frame.imagp; | 163 return m_frame.imagp; |
| 164 } | 164 } |
| 165 | 165 |
| 166 } // namespace blink | 166 } // namespace blink |
| 167 | 167 |
| 168 #endif // #if OS(MACOSX) | 168 #endif // #if OS(MACOSX) |
| 169 | 169 |
| 170 #endif // ENABLE(WEB_AUDIO) | 170 #endif // ENABLE(WEB_AUDIO) |
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