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 "modules/webaudio/WaveShaperProcessor.h"
30
31#include "modules/webaudio/WaveShaperDSPKernel.h"
32
33namespace blink {
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
47PassOwnPtr<AudioDSPKernel> WaveShaperProcessor::createKernel()
48{
49    return adoptPtr(new WaveShaperDSPKernel(this));
50}
51
52void WaveShaperProcessor::setCurve(Float32Array* curve)
53{
54    // This synchronizes with process().
55    MutexLocker processLocker(m_processLock);
56
57    m_curve = curve;
58}
59
60void WaveShaperProcessor::setOversample(OverSampleType oversample)
61{
62    // This synchronizes with process().
63    MutexLocker processLocker(m_processLock);
64
65    m_oversample = oversample;
66
67    if (oversample != OverSampleNone) {
68        for (unsigned i = 0; i < m_kernels.size(); ++i) {
69            WaveShaperDSPKernel* kernel = static_cast<WaveShaperDSPKernel*>(m_kernels[i].get());
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 call tryLock() instead.
88    MutexTryLocker tryLocker(m_processLock);
89    if (tryLocker.locked()) {
90        // For each channel of our input, process using the corresponding WaveShaperDSPKernel into the output channel.
91        for (unsigned i = 0; i < m_kernels.size(); ++i)
92            m_kernels[i]->process(source->channel(i)->data(), destination->channel(i)->mutableData(), framesToProcess);
93    } else {
94        // Too bad - the tryLock() failed. We must be in the middle of a setCurve() call.
95        destination->zero();
96    }
97}
98
99} // namespace blink
100
101#endif // ENABLE(WEB_AUDIO)
102