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
35namespace WebCore {
36
37// WaveShaperProcessor is an AudioDSPKernelProcessor which uses WaveShaperDSPKernel objects to implement non-linear distortion effects.
38
39class WaveShaperProcessor final : public AudioDSPKernelProcessor {
40public:
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
61private:
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