The Tor Browser / file comparison
comparison: content/media/webaudio/blink/ReverbInputBuffer.cpp
content/media/webaudio/blink/ReverbInputBuffer.cpp
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| 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 "ReverbInputBuffer.h" | |
| 30 #include "mozilla/PodOperations.h" | |
| 31 | |
| 32 using namespace mozilla; | |
| 33 | |
| 34 namespace WebCore { | |
| 35 | |
| 36 ReverbInputBuffer::ReverbInputBuffer(size_t length) | |
| 37 : m_writeIndex(0) | |
| 38 { | |
| 39 m_buffer.SetLength(length); | |
| 40 PodZero(m_buffer.Elements(), length); | |
| 41 } | |
| 42 | |
| 43 void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames) | |
| 44 { | |
| 45 size_t bufferLength = m_buffer.Length(); | |
| 46 bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength; | |
| 47 MOZ_ASSERT(isCopySafe); | |
| 48 if (!isCopySafe) | |
| 49 return; | |
| 50 | |
| 51 memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames); | |
| 52 | |
| 53 m_writeIndex += numberOfFrames; | |
| 54 MOZ_ASSERT(m_writeIndex <= bufferLength); | |
| 55 | |
| 56 if (m_writeIndex >= bufferLength) | |
| 57 m_writeIndex = 0; | |
| 58 } | |
| 59 | |
| 60 float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames) | |
| 61 { | |
| 62 size_t bufferLength = m_buffer.Length(); | |
| 63 bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength; | |
| 64 MOZ_ASSERT(isPointerGood); | |
| 65 if (!isPointerGood) { | |
| 66 // Should never happen in practice but return pointer to start of buffer (avoid crash) | |
| 67 if (readIndex) | |
| 68 *readIndex = 0; | |
| 69 return m_buffer.Elements(); | |
| 70 } | |
| 71 | |
| 72 float* sourceP = m_buffer.Elements(); | |
| 73 float* p = sourceP + *readIndex; | |
| 74 | |
| 75 // Update readIndex | |
| 76 *readIndex = (*readIndex + numberOfFrames) % bufferLength; | |
| 77 | |
| 78 return p; | |
| 79 } | |
| 80 | |
| 81 void ReverbInputBuffer::reset() | |
| 82 { | |
| 83 PodZero(m_buffer.Elements(), m_buffer.Length()); | |
| 84 m_writeIndex = 0; | |
| 85 } | |
| 86 | |
| 87 } // namespace WebCore |
