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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 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 are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * 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 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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91 // Copy source samples to 2nd half of input buffer. | 91 // Copy source samples to 2nd half of input buffer. |
92 bool isInputBufferGood = m_inputBuffer.size() == sourceFramesToProcess * 2 && | 92 bool isInputBufferGood = m_inputBuffer.size() == sourceFramesToProcess * 2 && |
93 halfSize <= sourceFramesToProcess; | 93 halfSize <= sourceFramesToProcess; |
94 ASSERT(isInputBufferGood); | 94 ASSERT(isInputBufferGood); |
95 if (!isInputBufferGood) | 95 if (!isInputBufferGood) |
96 return; | 96 return; |
97 | 97 |
98 float* inputP = m_inputBuffer.data() + sourceFramesToProcess; | 98 float* inputP = m_inputBuffer.data() + sourceFramesToProcess; |
99 memcpy(inputP, sourceP, sizeof(float) * sourceFramesToProcess); | 99 memcpy(inputP, sourceP, sizeof(float) * sourceFramesToProcess); |
100 | 100 |
101 // Copy even sample-frames 0,2,4,6... (delayed by the linear phase delay) dire
ctly into destP. | 101 // Copy even sample-frames 0,2,4,6... (delayed by the linear phase delay) |
| 102 // directly into destP. |
102 for (unsigned i = 0; i < sourceFramesToProcess; ++i) | 103 for (unsigned i = 0; i < sourceFramesToProcess; ++i) |
103 destP[i * 2] = *((inputP - halfSize) + i); | 104 destP[i * 2] = *((inputP - halfSize) + i); |
104 | 105 |
105 // Compute odd sample-frames 1,3,5,7... | 106 // Compute odd sample-frames 1,3,5,7... |
106 float* oddSamplesP = m_tempBuffer.data(); | 107 float* oddSamplesP = m_tempBuffer.data(); |
107 m_convolver.process(&m_kernel, sourceP, oddSamplesP, sourceFramesToProcess); | 108 m_convolver.process(&m_kernel, sourceP, oddSamplesP, sourceFramesToProcess); |
108 | 109 |
109 for (unsigned i = 0; i < sourceFramesToProcess; ++i) | 110 for (unsigned i = 0; i < sourceFramesToProcess; ++i) |
110 destP[i * 2 + 1] = oddSamplesP[i]; | 111 destP[i * 2 + 1] = oddSamplesP[i]; |
111 | 112 |
112 // Copy 2nd half of input buffer to 1st half. | 113 // Copy 2nd half of input buffer to 1st half. |
113 memcpy(m_inputBuffer.data(), inputP, sizeof(float) * sourceFramesToProcess); | 114 memcpy(m_inputBuffer.data(), inputP, sizeof(float) * sourceFramesToProcess); |
114 } | 115 } |
115 | 116 |
116 void UpSampler::reset() { | 117 void UpSampler::reset() { |
117 m_convolver.reset(); | 118 m_convolver.reset(); |
118 m_inputBuffer.zero(); | 119 m_inputBuffer.zero(); |
119 } | 120 } |
120 | 121 |
121 size_t UpSampler::latencyFrames() const { | 122 size_t UpSampler::latencyFrames() const { |
122 // Divide by two since this is a linear phase kernel and the delay is at the c
enter of the kernel. | 123 // Divide by two since this is a linear phase kernel and the delay is at the |
| 124 // center of the kernel. |
123 return m_kernel.size() / 2; | 125 return m_kernel.size() / 2; |
124 } | 126 } |
125 | 127 |
126 } // namespace blink | 128 } // namespace blink |
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