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/*
* Copyright (C) 2011, 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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 "config.h"
#if ENABLE(WEB_AUDIO)
#include "WaveShaperDSPKernel.h"
#include "WaveShaperProcessor.h"
#include <algorithm>
using namespace std;
namespace WebCore {
void WaveShaperDSPKernel::process(const float* source, float* destination, size_t framesToProcess)
{
ASSERT(source && destination && waveShaperProcessor());
Float32Array* curve = waveShaperProcessor()->curve();
if (!curve) {
// Act as "straight wire" pass-through if no curve is set.
memcpy(destination, source, sizeof(float) * framesToProcess);
return;
}
float* curveData = curve->data();
int curveLength = curve->length();
ASSERT(curveData);
if (!curveData || !curveLength) {
memcpy(destination, source, sizeof(float) * framesToProcess);
return;
}
// Apply waveshaping curve.
for (unsigned i = 0; i < framesToProcess; ++i) {
const float input = source[i];
// Calculate an index based on input -1 -> +1 with 0 being at the center of the curve data.
int index = (curveLength * (input + 1)) / 2;
// Clip index to the input range of the curve.
// This takes care of input outside of nominal range -1 -> +1
index = max(index, 0);
index = min(index, curveLength - 1);
destination[i] = curveData[index];
}
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
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