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 DynamicsCompressorNode_h
26#define DynamicsCompressorNode_h
27
28#include "AudioNode.h"
29#include "AudioParam.h"
30#include <memory>
31
32namespace WebCore {
33
34class DynamicsCompressor;
35
36class DynamicsCompressorNode : public AudioNode {
37public:
38    static PassRefPtr<DynamicsCompressorNode> create(AudioContext* context, float sampleRate)
39    {
40        return adoptRef(new DynamicsCompressorNode(context, sampleRate));
41    }
42
43    virtual ~DynamicsCompressorNode();
44
45    // AudioNode
46    virtual void process(size_t framesToProcess) override;
47    virtual void reset() override;
48    virtual void initialize() override;
49    virtual void uninitialize() override;
50
51    // Static compression curve parameters.
52    AudioParam* threshold() { return m_threshold.get(); }
53    AudioParam* knee() { return m_knee.get(); }
54    AudioParam* ratio() { return m_ratio.get(); }
55    AudioParam* attack() { return m_attack.get(); }
56    AudioParam* release() { return m_release.get(); }
57
58    // Amount by which the compressor is currently compressing the signal in decibels.
59    AudioParam* reduction() { return m_reduction.get(); }
60
61private:
62    virtual double tailTime() const override;
63    virtual double latencyTime() const override;
64
65    DynamicsCompressorNode(AudioContext*, float sampleRate);
66
67    std::unique_ptr<DynamicsCompressor> m_dynamicsCompressor;
68    RefPtr<AudioParam> m_threshold;
69    RefPtr<AudioParam> m_knee;
70    RefPtr<AudioParam> m_ratio;
71    RefPtr<AudioParam> m_reduction;
72    RefPtr<AudioParam> m_attack;
73    RefPtr<AudioParam> m_release;
74};
75
76} // namespace WebCore
77
78#endif // DynamicsCompressorNode_h
79