1/*
2 * Copyright (C) 2011, 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 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "config.h"
26
27#if ENABLE(WEB_AUDIO)
28
29#include "WaveShaperProcessor.h"
30
31#include "WaveShaperDSPKernel.h"
32
33namespace WebCore {
34
35WaveShaperProcessor::WaveShaperProcessor(float sampleRate, size_t numberOfChannels)
36 : AudioDSPKernelProcessor(sampleRate, numberOfChannels)
37 , m_oversample(OverSampleNone)
38{
39}
40
41WaveShaperProcessor::~WaveShaperProcessor()
42{
43 if (isInitialized())
44 uninitialize();
45}
46
47std::unique_ptr<AudioDSPKernel> WaveShaperProcessor::createKernel()
48{
49 return std::make_unique<WaveShaperDSPKernel>(this);
50}
51
52void WaveShaperProcessor::setCurve(Float32Array* curve)
53{
54 // This synchronizes with process().
55 std::lock_guard<Lock> lock(m_processMutex);
56
57 m_curve = curve;
58}
59
60void WaveShaperProcessor::setOversample(OverSampleType oversample)
61{
62 // This synchronizes with process().
63 std::lock_guard<Lock> lock(m_processMutex);
64
65 m_oversample = oversample;
66
67 if (oversample != OverSampleNone) {
68 for (auto& audioDSPKernel : m_kernels) {
69 WaveShaperDSPKernel& kernel = static_cast<WaveShaperDSPKernel&>(*audioDSPKernel);
70 kernel.lazyInitializeOversampling();
71 }
72 }
73}
74
75void WaveShaperProcessor::process(const AudioBus* source, AudioBus* destination, size_t framesToProcess)
76{
77 if (!isInitialized()) {
78 destination->zero();
79 return;
80 }
81
82 bool channelCountMatches = source->numberOfChannels() == destination->numberOfChannels() && source->numberOfChannels() == m_kernels.size();
83 ASSERT(channelCountMatches);
84 if (!channelCountMatches)
85 return;
86
87 // The audio thread can't block on this lock, so we use std::try_to_lock instead.
88 std::unique_lock<Lock> lock(m_processMutex, std::try_to_lock);
89 if (!lock.owns_lock()) {
90 // Too bad - the try_lock() failed. We must be in the middle of a setCurve() call.
91 destination->zero();
92 return;
93 }
94
95 // For each channel of our input, process using the corresponding WaveShaperDSPKernel into the output channel.
96 for (unsigned i = 0; i < m_kernels.size(); ++i)
97 m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->mutableData(), framesToProcess);
98}
99
100} // namespace WebCore
101
102#endif // ENABLE(WEB_AUDIO)
103