1/*
2 * Copyright (C) 2010, 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 ConvolverNode_h
26#define ConvolverNode_h
27
28#include "AudioNode.h"
29#include <memory>
30#include <mutex>
31#include <wtf/RefPtr.h>
32
33namespace WebCore {
34
35class AudioBuffer;
36class Reverb;
37
38class ConvolverNode : public AudioNode {
39public:
40    static PassRefPtr<ConvolverNode> create(AudioContext* context, float sampleRate)
41    {
42        return adoptRef(new ConvolverNode(context, sampleRate));
43    }
44
45    virtual ~ConvolverNode();
46
47    // AudioNode
48    virtual void process(size_t framesToProcess) override;
49    virtual void reset() override;
50    virtual void initialize() override;
51    virtual void uninitialize() override;
52
53    // Impulse responses
54    void setBuffer(AudioBuffer*);
55    AudioBuffer* buffer();
56
57    bool normalize() const { return m_normalize; }
58    void setNormalize(bool normalize) { m_normalize = normalize; }
59
60private:
61    ConvolverNode(AudioContext*, float sampleRate);
62
63    virtual double tailTime() const override;
64    virtual double latencyTime() const override;
65
66    std::unique_ptr<Reverb> m_reverb;
67    RefPtr<AudioBuffer> m_buffer;
68
69    // This synchronizes dynamic changes to the convolution impulse response with process().
70    mutable std::mutex m_processMutex;
71
72    // Normalize the impulse response or not. Must default to true.
73    bool m_normalize;
74};
75
76} // namespace WebCore
77
78#endif // ConvolverNode_h
79