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117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ReverbAccumulationBuffer.h"
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#include "AudioNodeEngine.h"
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#include "mozilla/PodOperations.h"
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#include <algorithm>
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using namespace mozilla;
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namespace WebCore {
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ReverbAccumulationBuffer::ReverbAccumulationBuffer(size_t length)
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: m_readIndex(0)
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, m_readTimeFrame(0)
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{
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m_buffer.SetLength(length);
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PodZero(m_buffer.Elements(), length);
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}
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void ReverbAccumulationBuffer::readAndClear(float* destination, size_t numberOfFrames)
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{
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size_t bufferLength = m_buffer.Length();
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bool isCopySafe = m_readIndex <= bufferLength && numberOfFrames <= bufferLength;
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MOZ_ASSERT(isCopySafe);
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if (!isCopySafe)
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return;
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size_t framesAvailable = bufferLength - m_readIndex;
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size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable);
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size_t numberOfFrames2 = numberOfFrames - numberOfFrames1;
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float* source = m_buffer.Elements();
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memcpy(destination, source + m_readIndex, sizeof(float) * numberOfFrames1);
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memset(source + m_readIndex, 0, sizeof(float) * numberOfFrames1);
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// Handle wrap-around if necessary
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if (numberOfFrames2 > 0) {
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memcpy(destination + numberOfFrames1, source, sizeof(float) * numberOfFrames2);
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memset(source, 0, sizeof(float) * numberOfFrames2);
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}
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m_readIndex = (m_readIndex + numberOfFrames) % bufferLength;
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m_readTimeFrame += numberOfFrames;
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}
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void ReverbAccumulationBuffer::updateReadIndex(int* readIndex, size_t numberOfFrames) const
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{
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// Update caller's readIndex
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*readIndex = (*readIndex + numberOfFrames) % m_buffer.Length();
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}
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int ReverbAccumulationBuffer::accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames)
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{
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size_t bufferLength = m_buffer.Length();
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size_t writeIndex = (*readIndex + delayFrames) % bufferLength;
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// Update caller's readIndex
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*readIndex = (*readIndex + numberOfFrames) % bufferLength;
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size_t framesAvailable = bufferLength - writeIndex;
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size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable);
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size_t numberOfFrames2 = numberOfFrames - numberOfFrames1;
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float* destination = m_buffer.Elements();
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bool isSafe = writeIndex <= bufferLength && numberOfFrames1 + writeIndex <= bufferLength && numberOfFrames2 <= bufferLength;
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MOZ_ASSERT(isSafe);
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if (!isSafe)
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return 0;
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AudioBufferAddWithScale(source, 1.0f, destination + writeIndex, numberOfFrames1);
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// Handle wrap-around if necessary
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if (numberOfFrames2 > 0) {
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AudioBufferAddWithScale(source + numberOfFrames1, 1.0f, destination, numberOfFrames2);
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}
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return writeIndex;
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}
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void ReverbAccumulationBuffer::reset()
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{
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PodZero(m_buffer.Elements(), m_buffer.Length());
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m_readIndex = 0;
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m_readTimeFrame = 0;
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}
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} // namespace WebCore
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