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 "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 #include <wtf/OwnPtr.h> 39 40 namespace WebCore { 41 42 using namespace VectorMath; 43 44 void AudioChannel::scale(double scale) 45 { 46 float s = static_cast<float>(scale); 47 vsmul(data(), 1, &s, data(), 1, length()); 48 } 49 50 void AudioChannel::copyFrom(const AudioChannel* sourceChannel) 51 { 52 bool isSafe = (sourceChannel && sourceChannel->length() >= length()); 53 ASSERT(isSafe); 54 if (!isSafe) 55 return; 56 57 memcpy(data(), sourceChannel->data(), sizeof(float) * length()); 58 } 59 60 void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame) 61 { 62 // Check that range is safe for reading from sourceChannel. 63 bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length(); 64 ASSERT(isRangeSafe); 65 if (!isRangeSafe) 66 return; 67 68 // Check that this channel has enough space. 69 size_t rangeLength = endFrame - startFrame; 70 bool isRangeLengthSafe = rangeLength <= length(); 71 ASSERT(isRangeLengthSafe); 72 if (!isRangeLengthSafe) 73 return; 74 75 const float* source = sourceChannel->data(); 76 float* destination = data(); 77 memcpy(destination, source + startFrame, sizeof(float) * rangeLength); 78 } 79 80 void AudioChannel::sumFrom(const AudioChannel* sourceChannel) 81 { 82 bool isSafe = sourceChannel && sourceChannel->length() >= length(); 83 ASSERT(isSafe); 84 if (!isSafe) 85 return; 86 87 vadd(data(), 1, sourceChannel->data(), 1, data(), 1, length()); 88 } 89 90 float AudioChannel::maxAbsValue() const 91 { 92 const float* p = data(); 93 int n = length(); 94 95 float max = 0.0f; 96 while (n--) 97 max = std::max(max, fabsf(*p++)); 98 99 return max; 100 } 101 102 } // WebCore 103 104 #endif // ENABLE(WEB_AUDIO) 105