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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "platform/audio/AudioChannel.h"
#include "platform/audio/VectorMath.h"
#include <algorithm>
#include <math.h>
namespace blink {
using namespace VectorMath;
void AudioChannel::resizeSmaller(size_t newLength) {
ASSERT(newLength <= m_length);
if (newLength <= m_length)
m_length = newLength;
}
void AudioChannel::scale(float scale) {
if (isSilent())
return;
vsmul(data(), 1, &scale, mutableData(), 1, length());
}
void AudioChannel::copyFrom(const AudioChannel* sourceChannel) {
bool isSafe = (sourceChannel && sourceChannel->length() >= length());
ASSERT(isSafe);
if (!isSafe)
return;
if (sourceChannel->isSilent()) {
zero();
return;
}
memcpy(mutableData(), sourceChannel->data(), sizeof(float) * length());
}
void AudioChannel::copyFromRange(const AudioChannel* sourceChannel,
unsigned startFrame,
unsigned endFrame) {
// Check that range is safe for reading from sourceChannel.
bool isRangeSafe = sourceChannel && startFrame < endFrame &&
endFrame <= sourceChannel->length();
ASSERT(isRangeSafe);
if (!isRangeSafe)
return;
if (sourceChannel->isSilent() && isSilent())
return;
// Check that this channel has enough space.
size_t rangeLength = endFrame - startFrame;
bool isRangeLengthSafe = rangeLength <= length();
ASSERT(isRangeLengthSafe);
if (!isRangeLengthSafe)
return;
const float* source = sourceChannel->data();
float* destination = mutableData();
if (sourceChannel->isSilent()) {
if (rangeLength == length())
zero();
else
memset(destination, 0, sizeof(float) * rangeLength);
} else
memcpy(destination, source + startFrame, sizeof(float) * rangeLength);
}
void AudioChannel::sumFrom(const AudioChannel* sourceChannel) {
bool isSafe = sourceChannel && sourceChannel->length() >= length();
ASSERT(isSafe);
if (!isSafe)
return;
if (sourceChannel->isSilent())
return;
if (isSilent())
copyFrom(sourceChannel);
else
vadd(data(), 1, sourceChannel->data(), 1, mutableData(), 1, length());
}
float AudioChannel::maxAbsValue() const {
if (isSilent())
return 0;
float max = 0;
vmaxmgv(data(), 1, &max, length());
return max;
}
} // namespace blink
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