зеркало из https://github.com/mozilla/gecko-dev.git
88 строки
3.1 KiB
C++
88 строки
3.1 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 "ReverbInputBuffer.h"
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#include "mozilla/PodOperations.h"
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using namespace mozilla;
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namespace WebCore {
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ReverbInputBuffer::ReverbInputBuffer(size_t length)
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: m_writeIndex(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 ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames)
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{
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size_t bufferLength = m_buffer.Length();
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bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength;
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MOZ_ASSERT(isCopySafe);
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if (!isCopySafe)
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return;
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memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames);
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m_writeIndex += numberOfFrames;
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MOZ_ASSERT(m_writeIndex <= bufferLength);
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if (m_writeIndex >= bufferLength)
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m_writeIndex = 0;
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}
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float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames)
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{
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size_t bufferLength = m_buffer.Length();
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bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength;
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MOZ_ASSERT(isPointerGood);
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if (!isPointerGood) {
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// Should never happen in practice but return pointer to start of buffer (avoid crash)
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if (readIndex)
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*readIndex = 0;
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return m_buffer.Elements();
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}
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float* sourceP = m_buffer.Elements();
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float* p = sourceP + *readIndex;
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// Update readIndex
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*readIndex = (*readIndex + numberOfFrames) % bufferLength;
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return p;
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}
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void ReverbInputBuffer::reset()
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{
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PodZero(m_buffer.Elements(), m_buffer.Length());
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m_writeIndex = 0;
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}
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} // namespace WebCore
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