| /* |
| * 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/ReverbInputBuffer.h" |
| |
| namespace WebCore { |
| |
| ReverbInputBuffer::ReverbInputBuffer(size_t length) |
| : m_buffer(length) |
| , m_writeIndex(0) |
| { |
| } |
| |
| void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames) |
| { |
| size_t bufferLength = m_buffer.size(); |
| bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength; |
| ASSERT(isCopySafe); |
| if (!isCopySafe) |
| return; |
| |
| memcpy(m_buffer.data() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames); |
| |
| m_writeIndex += numberOfFrames; |
| ASSERT(m_writeIndex <= bufferLength); |
| |
| if (m_writeIndex >= bufferLength) |
| m_writeIndex = 0; |
| } |
| |
| float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames) |
| { |
| size_t bufferLength = m_buffer.size(); |
| bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength; |
| ASSERT(isPointerGood); |
| if (!isPointerGood) { |
| // Should never happen in practice but return pointer to start of buffer (avoid crash) |
| if (readIndex) |
| *readIndex = 0; |
| return m_buffer.data(); |
| } |
| |
| float* sourceP = m_buffer.data(); |
| float* p = sourceP + *readIndex; |
| |
| // Update readIndex |
| *readIndex = (*readIndex + numberOfFrames) % bufferLength; |
| |
| return p; |
| } |
| |
| void ReverbInputBuffer::reset() |
| { |
| m_buffer.zero(); |
| m_writeIndex = 0; |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEB_AUDIO) |