| /* |
| * 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 "config.h" |
| |
| #if ENABLE(WEB_AUDIO) |
| |
| #include "platform/audio/ReverbAccumulationBuffer.h" |
| |
| #include "platform/audio/VectorMath.h" |
| |
| namespace WebCore { |
| |
| using namespace VectorMath; |
| |
| ReverbAccumulationBuffer::ReverbAccumulationBuffer(size_t length) |
| : m_buffer(length) |
| , m_readIndex(0) |
| , m_readTimeFrame(0) |
| { |
| } |
| |
| void ReverbAccumulationBuffer::readAndClear(float* destination, size_t numberOfFrames) |
| { |
| size_t bufferLength = m_buffer.size(); |
| bool isCopySafe = m_readIndex <= bufferLength && numberOfFrames <= bufferLength; |
| |
| ASSERT(isCopySafe); |
| if (!isCopySafe) |
| return; |
| |
| size_t framesAvailable = bufferLength - m_readIndex; |
| size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable); |
| size_t numberOfFrames2 = numberOfFrames - numberOfFrames1; |
| |
| float* source = m_buffer.data(); |
| memcpy(destination, source + m_readIndex, sizeof(float) * numberOfFrames1); |
| memset(source + m_readIndex, 0, sizeof(float) * numberOfFrames1); |
| |
| // Handle wrap-around if necessary |
| if (numberOfFrames2 > 0) { |
| memcpy(destination + numberOfFrames1, source, sizeof(float) * numberOfFrames2); |
| memset(source, 0, sizeof(float) * numberOfFrames2); |
| } |
| |
| m_readIndex = (m_readIndex + numberOfFrames) % bufferLength; |
| m_readTimeFrame += numberOfFrames; |
| } |
| |
| void ReverbAccumulationBuffer::updateReadIndex(int* readIndex, size_t numberOfFrames) const |
| { |
| // Update caller's readIndex |
| *readIndex = (*readIndex + numberOfFrames) % m_buffer.size(); |
| } |
| |
| int ReverbAccumulationBuffer::accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames) |
| { |
| size_t bufferLength = m_buffer.size(); |
| |
| size_t writeIndex = (*readIndex + delayFrames) % bufferLength; |
| |
| // Update caller's readIndex |
| *readIndex = (*readIndex + numberOfFrames) % bufferLength; |
| |
| size_t framesAvailable = bufferLength - writeIndex; |
| size_t numberOfFrames1 = std::min(numberOfFrames, framesAvailable); |
| size_t numberOfFrames2 = numberOfFrames - numberOfFrames1; |
| |
| float* destination = m_buffer.data(); |
| |
| bool isSafe = writeIndex <= bufferLength && numberOfFrames1 + writeIndex <= bufferLength && numberOfFrames2 <= bufferLength; |
| ASSERT(isSafe); |
| if (!isSafe) |
| return 0; |
| |
| vadd(source, 1, destination + writeIndex, 1, destination + writeIndex, 1, numberOfFrames1); |
| |
| // Handle wrap-around if necessary |
| if (numberOfFrames2 > 0) |
| vadd(source + numberOfFrames1, 1, destination, 1, destination, 1, numberOfFrames2); |
| |
| return writeIndex; |
| } |
| |
| void ReverbAccumulationBuffer::reset() |
| { |
| m_buffer.zero(); |
| m_readIndex = 0; |
| m_readTimeFrame = 0; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |