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33 #include "platform/audio/AudioChannel.h"
37 #include "platform/audio/VectorMath.h"
38 #include "wtf/OwnPtr.h"
42 using namespace VectorMath;
44 void AudioChannel::resizeSmaller(size_t newLength)
46 ASSERT(newLength <= m_length);
47 if (newLength <= m_length)
51 void AudioChannel::scale(float scale)
56 vsmul(data(), 1, &scale, mutableData(), 1, length());
59 void AudioChannel::copyFrom(const AudioChannel* sourceChannel)
61 bool isSafe = (sourceChannel && sourceChannel->length() >= length());
66 if (sourceChannel->isSilent()) {
70 memcpy(mutableData(), sourceChannel->data(), sizeof(float) * length());
73 void AudioChannel::copyFromRange(const AudioChannel* sourceChannel, unsigned startFrame, unsigned endFrame)
75 // Check that range is safe for reading from sourceChannel.
76 bool isRangeSafe = sourceChannel && startFrame < endFrame && endFrame <= sourceChannel->length();
81 if (sourceChannel->isSilent() && isSilent())
84 // Check that this channel has enough space.
85 size_t rangeLength = endFrame - startFrame;
86 bool isRangeLengthSafe = rangeLength <= length();
87 ASSERT(isRangeLengthSafe);
88 if (!isRangeLengthSafe)
91 const float* source = sourceChannel->data();
92 float* destination = mutableData();
94 if (sourceChannel->isSilent()) {
95 if (rangeLength == length())
98 memset(destination, 0, sizeof(float) * rangeLength);
100 memcpy(destination, source + startFrame, sizeof(float) * rangeLength);
103 void AudioChannel::sumFrom(const AudioChannel* sourceChannel)
105 bool isSafe = sourceChannel && sourceChannel->length() >= length();
110 if (sourceChannel->isSilent())
114 copyFrom(sourceChannel);
116 vadd(data(), 1, sourceChannel->data(), 1, mutableData(), 1, length());
119 float AudioChannel::maxAbsValue() const
126 vmaxmgv(data(), 1, &max, length());
133 #endif // ENABLE(WEB_AUDIO)