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 | |
33 | namespace WebCore { |
34 | |
35 | WaveShaperProcessor::WaveShaperProcessor(float sampleRate, size_t numberOfChannels) |
36 | : AudioDSPKernelProcessor(sampleRate, numberOfChannels) |
37 | , m_oversample(OverSampleNone) |
38 | { |
39 | } |
40 | |
41 | WaveShaperProcessor::~WaveShaperProcessor() |
42 | { |
43 | if (isInitialized()) |
44 | uninitialize(); |
45 | } |
46 | |
47 | std::unique_ptr<AudioDSPKernel> WaveShaperProcessor::createKernel() |
48 | { |
49 | return std::make_unique<WaveShaperDSPKernel>(this); |
50 | } |
51 | |
52 | void 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 | |
60 | void 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 | |
75 | void 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 | |