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 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 "config.h" 30 31#if ENABLE(WEB_AUDIO) 32 33#include "AudioChannel.h" 34 35#include "VectorMath.h" 36#include <algorithm> 37#include <math.h> 38 39namespace WebCore { 40 41using namespace VectorMath; 42 43void AudioChannel::resizeSmaller(size_t newLength) 44{ 45 ASSERT(newLength <= m_length); 46 if (newLength <= m_length) 47 m_length = newLength; 48} 49 50void AudioChannel::scale(float scale) 51{ 52 if (isSilent()) 53 return; 54 55 vsmul(data(), 1, &scale, mutableData(), 1, length()); 56} 57 58void AudioChannel::copyFrom(const AudioChannel* sourceChannel) 59{ 60 bool isSafe = (sourceChannel && sourceChannel->length() >= length()); 61 ASSERT(isSafe); 62 if (!isSafe) 63 return; 64 65 if (sourceChannel->isSilent()) { 66 zero(); 67 return; 68 } 69 memcpy(mutableData(), sourceChannel->data(), sizeof(float) * length()); 70} 71 72void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame) 73{ 74 // Check that range is safe for reading from sourceChannel. 75 bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length(); 76 ASSERT(isRangeSafe); 77 if (!isRangeSafe) 78 return; 79 80 if (sourceChannel->isSilent() && isSilent()) 81 return; 82 83 // Check that this channel has enough space. 84 size_t rangeLength = endFrame - startFrame; 85 bool isRangeLengthSafe = rangeLength <= length(); 86 ASSERT(isRangeLengthSafe); 87 if (!isRangeLengthSafe) 88 return; 89 90 const float* source = sourceChannel->data(); 91 float* destination = mutableData(); 92 93 if (sourceChannel->isSilent()) { 94 if (rangeLength == length()) 95 zero(); 96 else 97 memset(destination, 0, sizeof(float) * rangeLength); 98 } else 99 memcpy(destination, source + startFrame, sizeof(float) * rangeLength); 100} 101 102void AudioChannel::sumFrom(const AudioChannel* sourceChannel) 103{ 104 bool isSafe = sourceChannel && sourceChannel->length() >= length(); 105 ASSERT(isSafe); 106 if (!isSafe) 107 return; 108 109 if (sourceChannel->isSilent()) 110 return; 111 112 if (isSilent()) 113 copyFrom(sourceChannel); 114 else 115 vadd(data(), 1, sourceChannel->data(), 1, mutableData(), 1, length()); 116} 117 118float AudioChannel::maxAbsValue() const 119{ 120 if (isSilent()) 121 return 0; 122 123 float max = 0; 124 125 vmaxmgv(data(), 1, &max, length()); 126 127 return max; 128} 129 130} // WebCore 131 132#endif // ENABLE(WEB_AUDIO) 133