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 | #pragma once |
26 | |
27 | #include "AudioDSPKernel.h" |
28 | #include "AudioDSPKernelProcessor.h" |
29 | #include "AudioNode.h" |
30 | #include <JavaScriptCore/Float32Array.h> |
31 | #include <memory> |
32 | #include <wtf/Lock.h> |
33 | #include <wtf/RefPtr.h> |
34 | |
35 | namespace WebCore { |
36 | |
37 | // WaveShaperProcessor is an AudioDSPKernelProcessor which uses WaveShaperDSPKernel objects to implement non-linear distortion effects. |
38 | |
39 | class WaveShaperProcessor final : public AudioDSPKernelProcessor { |
40 | public: |
41 | enum OverSampleType { |
42 | OverSampleNone, |
43 | OverSample2x, |
44 | OverSample4x |
45 | }; |
46 | |
47 | WaveShaperProcessor(float sampleRate, size_t numberOfChannels); |
48 | |
49 | virtual ~WaveShaperProcessor(); |
50 | |
51 | std::unique_ptr<AudioDSPKernel> createKernel() override; |
52 | |
53 | void process(const AudioBus* source, AudioBus* destination, size_t framesToProcess) override; |
54 | |
55 | void setCurve(Float32Array*); |
56 | Float32Array* curve() { return m_curve.get(); } |
57 | |
58 | void setOversample(OverSampleType); |
59 | OverSampleType oversample() const { return m_oversample; } |
60 | |
61 | private: |
62 | // m_curve represents the non-linear shaping curve. |
63 | RefPtr<Float32Array> m_curve; |
64 | |
65 | OverSampleType m_oversample; |
66 | |
67 | // This synchronizes process() with setCurve(). |
68 | mutable Lock m_processMutex; |
69 | }; |
70 | |
71 | } // namespace WebCore |
72 | |