1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/blink/ReverbInputBuffer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,87 @@
1.4 +/*
1.5 + * Copyright (C) 2010 Google Inc. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions
1.9 + * are met:
1.10 + *
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
1.17 + * its contributors may be used to endorse or promote products derived
1.18 + * from this software without specific prior written permission.
1.19 + *
1.20 + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
1.21 + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
1.22 + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1.23 + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
1.24 + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.25 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
1.26 + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
1.27 + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.28 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.29 + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.30 + */
1.31 +
1.32 +#include "ReverbInputBuffer.h"
1.33 +#include "mozilla/PodOperations.h"
1.34 +
1.35 +using namespace mozilla;
1.36 +
1.37 +namespace WebCore {
1.38 +
1.39 +ReverbInputBuffer::ReverbInputBuffer(size_t length)
1.40 + : m_writeIndex(0)
1.41 +{
1.42 + m_buffer.SetLength(length);
1.43 + PodZero(m_buffer.Elements(), length);
1.44 +}
1.45 +
1.46 +void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames)
1.47 +{
1.48 + size_t bufferLength = m_buffer.Length();
1.49 + bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength;
1.50 + MOZ_ASSERT(isCopySafe);
1.51 + if (!isCopySafe)
1.52 + return;
1.53 +
1.54 + memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames);
1.55 +
1.56 + m_writeIndex += numberOfFrames;
1.57 + MOZ_ASSERT(m_writeIndex <= bufferLength);
1.58 +
1.59 + if (m_writeIndex >= bufferLength)
1.60 + m_writeIndex = 0;
1.61 +}
1.62 +
1.63 +float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames)
1.64 +{
1.65 + size_t bufferLength = m_buffer.Length();
1.66 + bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength;
1.67 + MOZ_ASSERT(isPointerGood);
1.68 + if (!isPointerGood) {
1.69 + // Should never happen in practice but return pointer to start of buffer (avoid crash)
1.70 + if (readIndex)
1.71 + *readIndex = 0;
1.72 + return m_buffer.Elements();
1.73 + }
1.74 +
1.75 + float* sourceP = m_buffer.Elements();
1.76 + float* p = sourceP + *readIndex;
1.77 +
1.78 + // Update readIndex
1.79 + *readIndex = (*readIndex + numberOfFrames) % bufferLength;
1.80 +
1.81 + return p;
1.82 +}
1.83 +
1.84 +void ReverbInputBuffer::reset()
1.85 +{
1.86 + PodZero(m_buffer.Elements(), m_buffer.Length());
1.87 + m_writeIndex = 0;
1.88 +}
1.89 +
1.90 +} // namespace WebCore
