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 | |
31 | namespace WebCore { |
32 | |
33 | class DynamicsCompressor; |
34 | |
35 | class DynamicsCompressorNode final : public AudioNode { |
36 | WTF_MAKE_ISO_ALLOCATED(DynamicsCompressorNode); |
37 | public: |
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 | |
61 | private: |
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 | |