The Tor Browser: content/media/webaudio/blink/ReverbInputBuffer.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /*

     2  * Copyright (C) 2010 Google Inc. All rights reserved.

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  *

     8  * 1.  Redistributions of source code must retain the above copyright

     9  *     notice, this list of conditions and the following disclaimer.

    10  * 2.  Redistributions in binary form must reproduce the above copyright

    11  *     notice, this list of conditions and the following disclaimer in the

    12  *     documentation and/or other materials provided with the distribution.

    13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

    14  *     its contributors may be used to endorse or promote products derived

    15  *     from this software without specific prior written permission.

    16  *

    17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

    18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

    19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

    20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

    21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

    22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

    23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

    24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

    26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    27  */

    29 #include "ReverbInputBuffer.h"

    30 #include "mozilla/PodOperations.h"

    32 using namespace mozilla;

    34 namespace WebCore {

    36 ReverbInputBuffer::ReverbInputBuffer(size_t length)

    37     : m_writeIndex(0)

    38 {

    39   m_buffer.SetLength(length);

    40   PodZero(m_buffer.Elements(), length);

    41 }

    43 void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames)

    44 {

    45     size_t bufferLength = m_buffer.Length();

    46     bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength;

    47     MOZ_ASSERT(isCopySafe);

    48     if (!isCopySafe)

    49         return;

    51     memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames);

    53     m_writeIndex += numberOfFrames;

    54     MOZ_ASSERT(m_writeIndex <= bufferLength);

    56     if (m_writeIndex >= bufferLength)

    57         m_writeIndex = 0;

    58 }

    60 float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames)

    61 {

    62     size_t bufferLength = m_buffer.Length();

    63     bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength;

    64     MOZ_ASSERT(isPointerGood);

    65     if (!isPointerGood) {

    66         // Should never happen in practice but return pointer to start of buffer (avoid crash)

    67         if (readIndex)

    68             *readIndex = 0;

    69         return m_buffer.Elements();

    70     }

    72     float* sourceP = m_buffer.Elements();

    73     float* p = sourceP + *readIndex;

    75     // Update readIndex

    76     *readIndex = (*readIndex + numberOfFrames) % bufferLength;

    78     return p;

    79 }

    81 void ReverbInputBuffer::reset()

    82 {

    83     PodZero(m_buffer.Elements(), m_buffer.Length());

    84     m_writeIndex = 0;

    85 }

    87 } // namespace WebCore

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