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 "AudioNode.h"
28#include "AudioParam.h"
29#include <memory>
30
31namespace WebCore {
32
33class DynamicsCompressor;
34
35class DynamicsCompressorNode final : public AudioNode {
36 WTF_MAKE_ISO_ALLOCATED(DynamicsCompressorNode);
37public:
38 static Ref<DynamicsCompressorNode> create(AudioContext& context, float sampleRate)
39 {
40 return adoptRef(*new DynamicsCompressorNode(context, sampleRate));
41 }
42
43 virtual ~DynamicsCompressorNode();
44
45 // AudioNode
46 void process(size_t framesToProcess) override;
47 void reset() override;
48 void initialize() override;
49 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 double tailTime() const override;
63 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