1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/blink/ReverbAccumulationBuffer.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,75 @@
1.4 +/*
1.5 + * Copyright (C) 2010 Google Inc. All rights reserved.
1.6 + *
1.7 + * Redistribution and use in source and binary forms, with or without
1.8 + * modification, are permitted provided that the following conditions
1.9 + * are met:
1.10 + *
1.11 + * 1. Redistributions of source code must retain the above copyright
1.12 + * notice, this list of conditions and the following disclaimer.
1.13 + * 2. Redistributions in binary form must reproduce the above copyright
1.14 + * notice, this list of conditions and the following disclaimer in the
1.15 + * documentation and/or other materials provided with the distribution.
1.16 + * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
1.17 + * its contributors may be used to endorse or promote products derived
1.18 + * from this software without specific prior written permission.
1.19 + *
1.20 + * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
1.21 + * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
1.22 + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
1.23 + * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
1.24 + * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
1.25 + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
1.26 + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
1.27 + * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
1.28 + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
1.29 + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1.30 + */
1.31 +
1.32 +#ifndef ReverbAccumulationBuffer_h
1.33 +#define ReverbAccumulationBuffer_h
1.34 +
1.35 +#include "nsTArray.h"
1.36 +#include "mozilla/MemoryReporting.h"
1.37 +
1.38 +namespace WebCore {
1.39 +
1.40 +typedef nsTArray<float> AudioFloatArray;
1.41 +
1.42 +// ReverbAccumulationBuffer is a circular delay buffer with one client reading from it and multiple clients
1.43 +// writing/accumulating to it at different delay offsets from the read position. The read operation will zero the memory
1.44 +// just read from the buffer, so it will be ready for accumulation the next time around.
1.45 +class ReverbAccumulationBuffer {
1.46 +public:
1.47 + ReverbAccumulationBuffer(size_t length);
1.48 +
1.49 + // This will read from, then clear-out numberOfFrames
1.50 + void readAndClear(float* destination, size_t numberOfFrames);
1.51 +
1.52 + // Each ReverbConvolverStage will accumulate its output at the appropriate delay from the read position.
1.53 + // We need to pass in and update readIndex here, since each ReverbConvolverStage may be running in
1.54 + // a different thread than the realtime thread calling ReadAndClear() and maintaining m_readIndex
1.55 + // Returns the writeIndex where the accumulation took place
1.56 + int accumulate(float* source, size_t numberOfFrames, int* readIndex, size_t delayFrames);
1.57 +
1.58 + size_t readIndex() const { return m_readIndex; }
1.59 + void updateReadIndex(int* readIndex, size_t numberOfFrames) const;
1.60 +
1.61 + size_t readTimeFrame() const { return m_readTimeFrame; }
1.62 +
1.63 + void reset();
1.64 +
1.65 + size_t sizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
1.66 + {
1.67 + return m_buffer.SizeOfExcludingThis(aMallocSizeOf);
1.68 + }
1.69 +
1.70 +private:
1.71 + AudioFloatArray m_buffer;
1.72 + size_t m_readIndex;
1.73 + size_t m_readTimeFrame; // for debugging (frame on continuous timeline)
1.74 +};
1.75 +
1.76 +} // namespace WebCore
1.77 +
1.78 +#endif // ReverbAccumulationBuffer_h
