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https://github.com/classilla/tenfourfox.git
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108 lines
4.2 KiB
C++
108 lines
4.2 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ReverbConvolverStage.h"
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#include "ReverbAccumulationBuffer.h"
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#include "ReverbConvolver.h"
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#include "ReverbInputBuffer.h"
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#include "mozilla/PodOperations.h"
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using namespace mozilla;
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namespace WebCore {
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ReverbConvolverStage::ReverbConvolverStage(const float* impulseResponse, size_t,
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size_t reverbTotalLatency,
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size_t stageOffset,
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size_t stageLength,
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size_t fftSize, size_t renderPhase,
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ReverbAccumulationBuffer* accumulationBuffer)
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: m_accumulationBuffer(accumulationBuffer)
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, m_accumulationReadIndex(0)
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, m_inputReadIndex(0)
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{
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MOZ_ASSERT(impulseResponse);
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MOZ_ASSERT(accumulationBuffer);
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m_fftKernel = new FFTBlock(fftSize);
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m_fftKernel->PadAndMakeScaledDFT(impulseResponse + stageOffset, stageLength);
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m_fftConvolver = new FFTConvolver(fftSize, renderPhase);
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// The convolution stage at offset stageOffset needs to have a corresponding delay to cancel out the offset.
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size_t totalDelay = stageOffset + reverbTotalLatency;
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// But, the FFT convolution itself incurs latency, so subtract this out...
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size_t fftLatency = m_fftConvolver->latencyFrames();
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MOZ_ASSERT(totalDelay >= fftLatency);
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totalDelay -= fftLatency;
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m_postDelayLength = totalDelay;
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}
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size_t ReverbConvolverStage::sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
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{
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size_t amount = aMallocSizeOf(this);
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if (m_fftKernel) {
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amount += m_fftKernel->SizeOfIncludingThis(aMallocSizeOf);
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}
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if (m_fftConvolver) {
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amount += m_fftConvolver->sizeOfIncludingThis(aMallocSizeOf);
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}
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return amount;
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}
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void ReverbConvolverStage::processInBackground(ReverbConvolver* convolver)
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{
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ReverbInputBuffer* inputBuffer = convolver->inputBuffer();
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float* source = inputBuffer->directReadFrom(&m_inputReadIndex,
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WEBAUDIO_BLOCK_SIZE);
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process(source);
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}
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void ReverbConvolverStage::process(const float* source)
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{
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MOZ_ASSERT(source);
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if (!source)
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return;
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// Now, run the convolution (into the delay buffer).
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// An expensive FFT will happen every fftSize / 2 frames.
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const float* output = m_fftConvolver->process(m_fftKernel, source);
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// Now accumulate into reverb's accumulation buffer.
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m_accumulationBuffer->accumulate(output, WEBAUDIO_BLOCK_SIZE,
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&m_accumulationReadIndex,
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m_postDelayLength);
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}
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} // namespace WebCore
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