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#ifndef WaveShaperProcessor_h
26#define WaveShaperProcessor_h
27
28#include "platform/audio/AudioDSPKernel.h"
29#include "platform/audio/AudioDSPKernelProcessor.h"
30#include "modules/webaudio/AudioNode.h"
31#include "wtf/Float32Array.h"
32#include "wtf/RefPtr.h"
33#include "wtf/ThreadingPrimitives.h"
34
35namespace blink {
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    virtual PassOwnPtr<AudioDSPKernel> createKernel() OVERRIDE;
52
53    virtual 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
68} // namespace blink
69
70#endif // WaveShaperProcessor_h
71