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| 1 /* | 1 /* |
| 2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 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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| 51 // Normal constructor: allocates for a given fftSize. | 51 // Normal constructor: allocates for a given fftSize. |
| 52 FFTFrame::FFTFrame(unsigned fftSize) | 52 FFTFrame::FFTFrame(unsigned fftSize) |
| 53 : m_FFTSize(fftSize), | 53 : m_FFTSize(fftSize), |
| 54 m_log2FFTSize(static_cast<unsigned>(log2(fftSize))), | 54 m_log2FFTSize(static_cast<unsigned>(log2(fftSize))), |
| 55 m_realData(fftSize / 2), | 55 m_realData(fftSize / 2), |
| 56 m_imagData(fftSize / 2), | 56 m_imagData(fftSize / 2), |
| 57 m_forwardContext(nullptr), | 57 m_forwardContext(nullptr), |
| 58 m_inverseContext(nullptr), | 58 m_inverseContext(nullptr), |
| 59 m_complexData(fftSize) { | 59 m_complexData(fftSize) { |
| 60 // We only allow power of two. | 60 // We only allow power of two. |
| 61 ASSERT(1UL << m_log2FFTSize == m_FFTSize); | 61 DCHECK_EQ(1UL << m_log2FFTSize, m_FFTSize); |
| 62 | 62 |
| 63 m_forwardContext = contextForSize(fftSize, DFT_R2C); | 63 m_forwardContext = contextForSize(fftSize, DFT_R2C); |
| 64 m_inverseContext = contextForSize(fftSize, IDFT_C2R); | 64 m_inverseContext = contextForSize(fftSize, IDFT_C2R); |
| 65 } | 65 } |
| 66 | 66 |
| 67 // Creates a blank/empty frame (interpolate() must later be called). | 67 // Creates a blank/empty frame (interpolate() must later be called). |
| 68 FFTFrame::FFTFrame() | 68 FFTFrame::FFTFrame() |
| 69 : m_FFTSize(0), | 69 : m_FFTSize(0), |
| 70 m_log2FFTSize(0), | 70 m_log2FFTSize(0), |
| 71 m_forwardContext(nullptr), | 71 m_forwardContext(nullptr), |
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| 150 return const_cast<float*>(m_complexData.data()); | 150 return const_cast<float*>(m_complexData.data()); |
| 151 } | 151 } |
| 152 | 152 |
| 153 RDFTContext* FFTFrame::contextForSize(unsigned fftSize, int trans) { | 153 RDFTContext* FFTFrame::contextForSize(unsigned fftSize, int trans) { |
| 154 // FIXME: This is non-optimal. Ideally, we'd like to share the contexts for | 154 // FIXME: This is non-optimal. Ideally, we'd like to share the contexts for |
| 155 // FFTFrames of the same size. But FFmpeg's RDFT uses a scratch buffer | 155 // FFTFrames of the same size. But FFmpeg's RDFT uses a scratch buffer |
| 156 // inside the context and so they are not thread-safe. We could improve this | 156 // inside the context and so they are not thread-safe. We could improve this |
| 157 // by sharing the FFTFrames on a per-thread basis. | 157 // by sharing the FFTFrames on a per-thread basis. |
| 158 DCHECK(fftSize); | 158 DCHECK(fftSize); |
| 159 int pow2size = static_cast<int>(log2(fftSize)); | 159 int pow2size = static_cast<int>(log2(fftSize)); |
| 160 ASSERT(pow2size < kMaxFFTPow2Size); | 160 DCHECK_LT(pow2size, kMaxFFTPow2Size); |
| 161 | 161 |
| 162 RDFTContext* context = av_rdft_init(pow2size, (RDFTransformType)trans); | 162 RDFTContext* context = av_rdft_init(pow2size, (RDFTransformType)trans); |
| 163 return context; | 163 return context; |
| 164 } | 164 } |
| 165 | 165 |
| 166 } // namespace blink | 166 } // namespace blink |
| 167 | 167 |
| 168 #endif // USE(WEBAUDIO_FFMPEG) | 168 #endif // USE(WEBAUDIO_FFMPEG) |
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