The Tor Browser / file comparison
comparison: content/media/webaudio/blink/ReverbAccumulationBuffer.cpp
content/media/webaudio/blink/ReverbAccumulationBuffer.cpp
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
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| -1:000000000000 | 0:73f82bbe7e5a |
|---|---|
| 1 /* | |
| 2 * Copyright (C) 2010 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * | |
| 8 * 1. Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 * notice, this list of conditions and the following disclaimer in the | |
| 12 * documentation and/or other materials provided with the distribution. | |
| 13 * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of | |
| 14 * its contributors may be used to endorse or promote products derived | |
| 15 * from this software without specific prior written permission. | |
| 16 * | |
| 17 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY | |
| 18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
| 20 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY | |
| 21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
| 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | |
| 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | |
| 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 27 */ | |
| 28 | |
| 29 #include "ReverbAccumulationBuffer.h" | |
| 30 #include "AudioNodeEngine.h" | |
| 31 #include "mozilla/PodOperations.h" | |
| 32 #include <algorithm> | |
| 33 | |
| 34 using namespace mozilla; | |
| 35 | |
| 36 namespace WebCore { | |
| 37 | |
| 38 ReverbAccumulationBuffer::ReverbAccumulationBuffer(size_t length) | |
| 39 : m_readIndex(0) | |
| 40 , m_readTimeFrame(0) | |
| 41 { | |
| 42 m_buffer.SetLength(length); | |
| 43 PodZero(m_buffer.Elements(), length); | |
| 44 } | |
| 45 | |
| 46 void ReverbAccumulationBuffer::readAndClear(float* destination, size_t numberOfFrames) | |
| 47 { | |
| 48 size_t bufferLength = m_buffer.Length(); | |
| 49 bool isCopySafe = m_readIndex <= bufferLength && numberOfFrames <= bufferLength; | |
| 50 | |
| 51 MOZ_ASSERT(isCopySafe); | |
| 52 if (!isCopySafe) | |
| 53 return; | |
| 54 | |
| 55 size_t framesAvailable = bufferLength - m_readIndex; | |
| 56 size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable); | |
| 57 size_t numberOfFrames2 = numberOfFrames - numberOfFrames1; | |
| 58 | |
| 59 float* source = m_buffer.Elements(); | |
| 60 memcpy(destination, source + m_readIndex, sizeof(float) * numberOfFrames1); | |
| 61 memset(source + m_readIndex, 0, sizeof(float) * numberOfFrames1); | |
| 62 | |
| 63 // Handle wrap-around if necessary | |
| 64 if (numberOfFrames2 > 0) { | |
| 65 memcpy(destination + numberOfFrames1, source, sizeof(float) * numberOfFrames2); | |
| 66 memset(source, 0, sizeof(float) * numberOfFrames2); | |
| 67 } | |
| 68 | |
| 69 m_readIndex = (m_readIndex + numberOfFrames) % bufferLength; | |
| 70 m_readTimeFrame += numberOfFrames; | |
| 71 } | |
| 72 | |
| 73 void ReverbAccumulationBuffer::updateReadIndex(int* readIndex, size_t numberOfFrames) const | |
| 74 { | |
| 75 // Update caller's readIndex | |
| 76 *readIndex = (*readIndex + numberOfFrames) % m_buffer.Length(); | |
| 77 } | |
| 78 | |
| 79 int ReverbAccumulationBuffer::accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames) | |
| 80 { | |
| 81 size_t bufferLength = m_buffer.Length(); | |
| 82 | |
| 83 size_t writeIndex = (*readIndex + delayFrames) % bufferLength; | |
| 84 | |
| 85 // Update caller's readIndex | |
| 86 *readIndex = (*readIndex + numberOfFrames) % bufferLength; | |
| 87 | |
| 88 size_t framesAvailable = bufferLength - writeIndex; | |
| 89 size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable); | |
| 90 size_t numberOfFrames2 = numberOfFrames - numberOfFrames1; | |
| 91 | |
| 92 float* destination = m_buffer.Elements(); | |
| 93 | |
| 94 bool isSafe = writeIndex <= bufferLength && numberOfFrames1 + writeIndex <= bufferLength && numberOfFrames2 <= bufferLength; | |
| 95 MOZ_ASSERT(isSafe); | |
| 96 if (!isSafe) | |
| 97 return 0; | |
| 98 | |
| 99 AudioBufferAddWithScale(source, 1.0f, destination + writeIndex, numberOfFrames1); | |
| 100 | |
| 101 // Handle wrap-around if necessary | |
| 102 if (numberOfFrames2 > 0) { | |
| 103 AudioBufferAddWithScale(source + numberOfFrames1, 1.0f, destination, numberOfFrames2); | |
| 104 } | |
| 105 | |
| 106 return writeIndex; | |
| 107 } | |
| 108 | |
| 109 void ReverbAccumulationBuffer::reset() | |
| 110 { | |
| 111 PodZero(m_buffer.Elements(), m_buffer.Length()); | |
| 112 m_readIndex = 0; | |
| 113 m_readTimeFrame = 0; | |
| 114 } | |
| 115 | |
| 116 } // namespace WebCore |
