content/media/webaudio/blink/ReverbInputBuffer.cpp@b8a032363ba2 (annotated)
content/media/webaudio/blink/ReverbInputBuffer.cpp
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2010 Google Inc. All rights reserved. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Redistribution and use in source and binary forms, with or without |
| michael@0 | 5 | * modification, are permitted provided that the following conditions |
| michael@0 | 6 | * are met: |
| michael@0 | 7 | * |
| michael@0 | 8 | * 1. Redistributions of source code must retain the above copyright |
| michael@0 | 9 | * notice, this list of conditions and the following disclaimer. |
| michael@0 | 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| michael@0 | 11 | * notice, this list of conditions and the following disclaimer in the |
| michael@0 | 12 | * documentation and/or other materials provided with the distribution. |
| michael@0 | 13 | * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of |
| michael@0 | 14 | * its contributors may be used to endorse or promote products derived |
| michael@0 | 15 | * from this software without specific prior written permission. |
| michael@0 | 16 | * |
| michael@0 | 17 | * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY |
| michael@0 | 18 | * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
| michael@0 | 19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| michael@0 | 20 | * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY |
| michael@0 | 21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| michael@0 | 22 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| michael@0 | 23 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| michael@0 | 24 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| michael@0 | 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| michael@0 | 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| michael@0 | 27 | */ |
| michael@0 | 28 | |
| michael@0 | 29 | #include "ReverbInputBuffer.h" |
| michael@0 | 30 | #include "mozilla/PodOperations.h" |
| michael@0 | 31 | |
| michael@0 | 32 | using namespace mozilla; |
| michael@0 | 33 | |
| michael@0 | 34 | namespace WebCore { |
| michael@0 | 35 | |
| michael@0 | 36 | ReverbInputBuffer::ReverbInputBuffer(size_t length) |
| michael@0 | 37 | : m_writeIndex(0) |
| michael@0 | 38 | { |
| michael@0 | 39 | m_buffer.SetLength(length); |
| michael@0 | 40 | PodZero(m_buffer.Elements(), length); |
| michael@0 | 41 | } |
| michael@0 | 42 | |
| michael@0 | 43 | void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames) |
| michael@0 | 44 | { |
| michael@0 | 45 | size_t bufferLength = m_buffer.Length(); |
| michael@0 | 46 | bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength; |
| michael@0 | 47 | MOZ_ASSERT(isCopySafe); |
| michael@0 | 48 | if (!isCopySafe) |
| michael@0 | 49 | return; |
| michael@0 | 50 | |
| michael@0 | 51 | memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames); |
| michael@0 | 52 | |
| michael@0 | 53 | m_writeIndex += numberOfFrames; |
| michael@0 | 54 | MOZ_ASSERT(m_writeIndex <= bufferLength); |
| michael@0 | 55 | |
| michael@0 | 56 | if (m_writeIndex >= bufferLength) |
| michael@0 | 57 | m_writeIndex = 0; |
| michael@0 | 58 | } |
| michael@0 | 59 | |
| michael@0 | 60 | float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames) |
| michael@0 | 61 | { |
| michael@0 | 62 | size_t bufferLength = m_buffer.Length(); |
| michael@0 | 63 | bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength; |
| michael@0 | 64 | MOZ_ASSERT(isPointerGood); |
| michael@0 | 65 | if (!isPointerGood) { |
| michael@0 | 66 | // Should never happen in practice but return pointer to start of buffer (avoid crash) |
| michael@0 | 67 | if (readIndex) |
| michael@0 | 68 | *readIndex = 0; |
| michael@0 | 69 | return m_buffer.Elements(); |
| michael@0 | 70 | } |
| michael@0 | 71 | |
| michael@0 | 72 | float* sourceP = m_buffer.Elements(); |
| michael@0 | 73 | float* p = sourceP + *readIndex; |
| michael@0 | 74 | |
| michael@0 | 75 | // Update readIndex |
| michael@0 | 76 | *readIndex = (*readIndex + numberOfFrames) % bufferLength; |
| michael@0 | 77 | |
| michael@0 | 78 | return p; |
| michael@0 | 79 | } |
| michael@0 | 80 | |
| michael@0 | 81 | void ReverbInputBuffer::reset() |
| michael@0 | 82 | { |
| michael@0 | 83 | PodZero(m_buffer.Elements(), m_buffer.Length()); |
| michael@0 | 84 | m_writeIndex = 0; |
| michael@0 | 85 | } |
| michael@0 | 86 | |
| michael@0 | 87 | } // namespace WebCore |
