1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/blink/ReverbConvolver.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,99 @@
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 ReverbConvolver_h
1.33 +#define ReverbConvolver_h
1.34 +
1.35 +#include "ReverbAccumulationBuffer.h"
1.36 +#include "ReverbInputBuffer.h"
1.37 +#include "nsAutoPtr.h"
1.38 +#include "mozilla/MemoryReporting.h"
1.39 +#ifdef LOG
1.40 +#undef LOG
1.41 +#endif
1.42 +#include "base/condition_variable.h"
1.43 +#include "base/lock.h"
1.44 +#include "base/thread.h"
1.45 +
1.46 +namespace WebCore {
1.47 +
1.48 +class ReverbConvolverStage;
1.49 +
1.50 +class ReverbConvolver {
1.51 +public:
1.52 + // maxFFTSize can be adjusted (from say 2048 to 32768) depending on how much precision is necessary.
1.53 + // For certain tweaky de-convolving applications the phase errors add up quickly and lead to non-sensical results with
1.54 + // larger FFT sizes and single-precision floats. In these cases 2048 is a good size.
1.55 + // If not doing multi-threaded convolution, then should not go > 8192.
1.56 + ReverbConvolver(const float* impulseResponseData, size_t impulseResponseLength, size_t renderSliceSize, size_t maxFFTSize, size_t convolverRenderPhase, bool useBackgroundThreads);
1.57 + ~ReverbConvolver();
1.58 +
1.59 + void process(const float* sourceChannelData, size_t sourceChannelLength,
1.60 + float* destinationChannelData, size_t destinationChannelLength,
1.61 + size_t framesToProcess);
1.62 + void reset();
1.63 +
1.64 + size_t impulseResponseLength() const { return m_impulseResponseLength; }
1.65 +
1.66 + ReverbInputBuffer* inputBuffer() { return &m_inputBuffer; }
1.67 +
1.68 + bool useBackgroundThreads() const { return m_useBackgroundThreads; }
1.69 + void backgroundThreadEntry();
1.70 +
1.71 + size_t latencyFrames() const;
1.72 +
1.73 + size_t sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
1.74 +private:
1.75 + nsTArray<nsAutoPtr<ReverbConvolverStage> > m_stages;
1.76 + nsTArray<nsAutoPtr<ReverbConvolverStage> > m_backgroundStages;
1.77 + size_t m_impulseResponseLength;
1.78 +
1.79 + ReverbAccumulationBuffer m_accumulationBuffer;
1.80 +
1.81 + // One or more background threads read from this input buffer which is fed from the realtime thread.
1.82 + ReverbInputBuffer m_inputBuffer;
1.83 +
1.84 + // First stage will be of size m_minFFTSize. Each next stage will be twice as big until we hit m_maxFFTSize.
1.85 + size_t m_minFFTSize;
1.86 + size_t m_maxFFTSize;
1.87 +
1.88 + // But don't exceed this size in the real-time thread (if we're doing background processing).
1.89 + size_t m_maxRealtimeFFTSize;
1.90 +
1.91 + // Background thread and synchronization
1.92 + base::Thread m_backgroundThread;
1.93 + Lock m_backgroundThreadLock;
1.94 + ConditionVariable m_backgroundThreadCondition;
1.95 + bool m_useBackgroundThreads;
1.96 + bool m_wantsToExit;
1.97 + bool m_moreInputBuffered;
1.98 +};
1.99 +
1.100 +} // namespace WebCore
1.101 +
1.102 +#endif // ReverbConvolver_h
