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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 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
| 8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
| 10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
| (...skipping 76 matching lines...) Expand 10 before | Expand all | Expand 10 after Loading... |
| 87 source[0] = m_lastValues[0]; | 87 source[0] = m_lastValues[0]; |
| 88 source[1] = m_lastValues[1]; | 88 source[1] = m_lastValues[1]; |
| 89 } | 89 } |
| 90 | 90 |
| 91 // Make a local copy. | 91 // Make a local copy. |
| 92 double virtualReadIndex = m_virtualReadIndex; | 92 double virtualReadIndex = m_virtualReadIndex; |
| 93 | 93 |
| 94 // Sanity check source buffer access. | 94 // Sanity check source buffer access. |
| 95 ASSERT(framesToProcess > 0); | 95 ASSERT(framesToProcess > 0); |
| 96 ASSERT(virtualReadIndex >= 0 && | 96 ASSERT(virtualReadIndex >= 0 && |
| 97 1 + static_cast<unsigned>(virtualReadIndex + | 97 1 + |
| 98 (framesToProcess - 1) * rate) < | 98 static_cast<unsigned>(virtualReadIndex + |
| 99 (framesToProcess - 1) * rate) < |
| 99 m_sourceBuffer.size()); | 100 m_sourceBuffer.size()); |
| 100 | 101 |
| 101 // Do the linear interpolation. | 102 // Do the linear interpolation. |
| 102 int n = framesToProcess; | 103 int n = framesToProcess; |
| 103 while (n--) { | 104 while (n--) { |
| 104 unsigned readIndex = static_cast<unsigned>(virtualReadIndex); | 105 unsigned readIndex = static_cast<unsigned>(virtualReadIndex); |
| 105 double interpolationFactor = virtualReadIndex - readIndex; | 106 double interpolationFactor = virtualReadIndex - readIndex; |
| 106 | 107 |
| 107 double sample1 = source[readIndex]; | 108 double sample1 = source[readIndex]; |
| 108 double sample2 = source[readIndex + 1]; | 109 double sample2 = source[readIndex + 1]; |
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| 134 m_fillIndex = 0; | 135 m_fillIndex = 0; |
| 135 m_lastValues[0] = 0.0f; | 136 m_lastValues[0] = 0.0f; |
| 136 m_lastValues[1] = 0.0f; | 137 m_lastValues[1] = 0.0f; |
| 137 } | 138 } |
| 138 | 139 |
| 139 double AudioResamplerKernel::rate() const { | 140 double AudioResamplerKernel::rate() const { |
| 140 return m_resampler->rate(); | 141 return m_resampler->rate(); |
| 141 } | 142 } |
| 142 | 143 |
| 143 } // namespace blink | 144 } // namespace blink |
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