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 "ReverbConvolverStage.h"
30
31 #include "ReverbAccumulationBuffer.h"
32 #include "ReverbConvolver.h"
33 #include "ReverbInputBuffer.h"
34 #include "mozilla/PodOperations.h"
35
36 using namespace mozilla;
37
38 namespace WebCore {
39
ReverbConvolverStage(const float * impulseResponse,size_t,size_t reverbTotalLatency,size_t stageOffset,size_t stageLength,size_t fftSize,size_t renderPhase,ReverbAccumulationBuffer * accumulationBuffer)40 ReverbConvolverStage::ReverbConvolverStage(
41 const float* impulseResponse, size_t, size_t reverbTotalLatency,
42 size_t stageOffset, size_t stageLength, size_t fftSize, size_t renderPhase,
43 ReverbAccumulationBuffer* accumulationBuffer)
44 : m_accumulationBuffer(accumulationBuffer),
45 m_accumulationReadIndex(0),
46 m_inputReadIndex(0) {
47 MOZ_ASSERT(impulseResponse);
48 MOZ_ASSERT(accumulationBuffer);
49
50 m_fftKernel = MakeUnique<FFTBlock>(fftSize);
51 m_fftKernel->PadAndMakeScaledDFT(impulseResponse + stageOffset, stageLength);
52 m_fftConvolver = MakeUnique<FFTConvolver>(fftSize, renderPhase);
53
54 // The convolution stage at offset stageOffset needs to have a corresponding
55 // delay to cancel out the offset.
56 size_t totalDelay = stageOffset + reverbTotalLatency;
57
58 // But, the FFT convolution itself incurs latency, so subtract this out...
59 size_t fftLatency = m_fftConvolver->latencyFrames();
60 MOZ_ASSERT(totalDelay >= fftLatency);
61 totalDelay -= fftLatency;
62
63 m_postDelayLength = totalDelay;
64 }
65
sizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const66 size_t ReverbConvolverStage::sizeOfIncludingThis(
67 mozilla::MallocSizeOf aMallocSizeOf) const {
68 size_t amount = aMallocSizeOf(this);
69
70 if (m_fftKernel) {
71 amount += m_fftKernel->SizeOfIncludingThis(aMallocSizeOf);
72 }
73
74 if (m_fftConvolver) {
75 amount += m_fftConvolver->sizeOfIncludingThis(aMallocSizeOf);
76 }
77
78 return amount;
79 }
80
processInBackground(ReverbConvolver * convolver)81 void ReverbConvolverStage::processInBackground(ReverbConvolver* convolver) {
82 ReverbInputBuffer* inputBuffer = convolver->inputBuffer();
83 float* source =
84 inputBuffer->directReadFrom(&m_inputReadIndex, WEBAUDIO_BLOCK_SIZE);
85 process(source);
86 }
87
process(const float * source)88 void ReverbConvolverStage::process(const float* source) {
89 MOZ_ASSERT(source);
90 if (!source) return;
91
92 // Now, run the convolution (into the delay buffer).
93 // An expensive FFT will happen every fftSize / 2 frames.
94 const float* output = m_fftConvolver->process(m_fftKernel.get(), source);
95
96 // Now accumulate into reverb's accumulation buffer.
97 m_accumulationBuffer->accumulate(output, WEBAUDIO_BLOCK_SIZE,
98 &m_accumulationReadIndex, m_postDelayLength);
99 }
100
101 } // namespace WebCore
102