Line data    Source code

       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             :  */
      28             : 
      29             : #include "ReverbInputBuffer.h"
      30             : #include "mozilla/PodOperations.h"
      31             : 
      32             : using namespace mozilla;
      33             : 
      34             : namespace WebCore {
      35             : 
      36           0 : ReverbInputBuffer::ReverbInputBuffer(size_t length)
      37           0 :     : m_writeIndex(0)
      38             : {
      39           0 :   m_buffer.SetLength(length);
      40           0 :   PodZero(m_buffer.Elements(), length);
      41           0 : }
      42             : 
      43           0 : void ReverbInputBuffer::write(const float* sourceP, size_t numberOfFrames)
      44             : {
      45           0 :     size_t bufferLength = m_buffer.Length();
      46           0 :     bool isCopySafe = m_writeIndex + numberOfFrames <= bufferLength;
      47           0 :     MOZ_ASSERT(isCopySafe);
      48           0 :     if (!isCopySafe)
      49           0 :         return;
      50             : 
      51           0 :     memcpy(m_buffer.Elements() + m_writeIndex, sourceP, sizeof(float) * numberOfFrames);
      52             : 
      53           0 :     m_writeIndex += numberOfFrames;
      54           0 :     MOZ_ASSERT(m_writeIndex <= bufferLength);
      55             : 
      56           0 :     if (m_writeIndex >= bufferLength)
      57           0 :         m_writeIndex = 0;
      58             : }
      59             : 
      60           0 : float* ReverbInputBuffer::directReadFrom(int* readIndex, size_t numberOfFrames)
      61             : {
      62           0 :     size_t bufferLength = m_buffer.Length();
      63           0 :     bool isPointerGood = readIndex && *readIndex >= 0 && *readIndex + numberOfFrames <= bufferLength;
      64           0 :     MOZ_ASSERT(isPointerGood);
      65           0 :     if (!isPointerGood) {
      66             :         // Should never happen in practice but return pointer to start of buffer (avoid crash)
      67           0 :         if (readIndex)
      68           0 :             *readIndex = 0;
      69           0 :         return m_buffer.Elements();
      70             :     }
      71             : 
      72           0 :     float* sourceP = m_buffer.Elements();
      73           0 :     float* p = sourceP + *readIndex;
      74             : 
      75             :     // Update readIndex
      76           0 :     *readIndex = (*readIndex + numberOfFrames) % bufferLength;
      77             : 
      78           0 :     return p;
      79             : }
      80             : 
      81           0 : void ReverbInputBuffer::reset()
      82             : {
      83           0 :     PodZero(m_buffer.Elements(), m_buffer.Length());
      84           0 :     m_writeIndex = 0;
      85           0 : }
      86             : 
      87             : } // namespace WebCore