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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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| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 */ | 29 */ |
| 30 | 30 |
| 31 #include "platform/audio/DownSampler.h" | 31 #include "platform/audio/DownSampler.h" |
| 32 #include "wtf/MathExtras.h" | 32 #include "platform/wtf/MathExtras.h" |
| 33 | 33 |
| 34 namespace blink { | 34 namespace blink { |
| 35 | 35 |
| 36 DownSampler::DownSampler(size_t inputBlockSize) | 36 DownSampler::DownSampler(size_t inputBlockSize) |
| 37 : m_inputBlockSize(inputBlockSize), | 37 : m_inputBlockSize(inputBlockSize), |
| 38 m_reducedKernel(DefaultKernelSize / 2), | 38 m_reducedKernel(DefaultKernelSize / 2), |
| 39 m_convolver(inputBlockSize / 2), // runs at 1/2 source sample-rate | 39 m_convolver(inputBlockSize / 2), // runs at 1/2 source sample-rate |
| 40 m_tempBuffer(inputBlockSize / 2), | 40 m_tempBuffer(inputBlockSize / 2), |
| 41 m_inputBuffer(inputBlockSize * 2) { | 41 m_inputBuffer(inputBlockSize * 2) { |
| 42 initializeKernel(); | 42 initializeKernel(); |
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| 139 m_inputBuffer.zero(); | 139 m_inputBuffer.zero(); |
| 140 } | 140 } |
| 141 | 141 |
| 142 size_t DownSampler::latencyFrames() const { | 142 size_t DownSampler::latencyFrames() const { |
| 143 // Divide by two since this is a linear phase kernel and the delay is at the | 143 // Divide by two since this is a linear phase kernel and the delay is at the |
| 144 // center of the kernel. | 144 // center of the kernel. |
| 145 return m_reducedKernel.size() / 2; | 145 return m_reducedKernel.size() / 2; |
| 146 } | 146 } |
| 147 | 147 |
| 148 } // namespace blink | 148 } // namespace blink |
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