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#include "config.h"
26
27#if ENABLE(WEB_AUDIO)
28
29#include "DynamicsCompressorNode.h"
30
31#include "AudioContext.h"
32#include "AudioNodeInput.h"
33#include "AudioNodeOutput.h"
34#include "DynamicsCompressor.h"
35#include <wtf/IsoMallocInlines.h>
36
37// Set output to stereo by default.
38static const unsigned defaultNumberOfOutputChannels = 2;
39
40namespace WebCore {
41
42WTF_MAKE_ISO_ALLOCATED_IMPL(DynamicsCompressorNode);
43
44DynamicsCompressorNode::DynamicsCompressorNode(AudioContext& context, float sampleRate)
45 : AudioNode(context, sampleRate)
46{
47 setNodeType(NodeTypeDynamicsCompressor);
48
49 addInput(std::make_unique<AudioNodeInput>(this));
50 addOutput(std::make_unique<AudioNodeOutput>(this, defaultNumberOfOutputChannels));
51
52 m_threshold = AudioParam::create(context, "threshold", -24, -100, 0);
53 m_knee = AudioParam::create(context, "knee", 30, 0, 40);
54 m_ratio = AudioParam::create(context, "ratio", 12, 1, 20);
55 m_reduction = AudioParam::create(context, "reduction", 0, -20, 0);
56 m_attack = AudioParam::create(context, "attack", 0.003, 0, 1);
57 m_release = AudioParam::create(context, "release", 0.250, 0, 1);
58
59 initialize();
60}
61
62DynamicsCompressorNode::~DynamicsCompressorNode()
63{
64 uninitialize();
65}
66
67void DynamicsCompressorNode::process(size_t framesToProcess)
68{
69 AudioBus* outputBus = output(0)->bus();
70 ASSERT(outputBus);
71
72 float threshold = m_threshold->value();
73 float knee = m_knee->value();
74 float ratio = m_ratio->value();
75 float attack = m_attack->value();
76 float release = m_release->value();
77
78 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
79 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
80 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
81 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
82 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
83
84 m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
85
86 float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
87 m_reduction->setValue(reduction);
88}
89
90void DynamicsCompressorNode::reset()
91{
92 m_dynamicsCompressor->reset();
93}
94
95void DynamicsCompressorNode::initialize()
96{
97 if (isInitialized())
98 return;
99
100 AudioNode::initialize();
101 m_dynamicsCompressor = std::make_unique<DynamicsCompressor>(sampleRate(), defaultNumberOfOutputChannels);
102}
103
104void DynamicsCompressorNode::uninitialize()
105{
106 if (!isInitialized())
107 return;
108
109 m_dynamicsCompressor = nullptr;
110 AudioNode::uninitialize();
111}
112
113double DynamicsCompressorNode::tailTime() const
114{
115 return m_dynamicsCompressor->tailTime();
116}
117
118double DynamicsCompressorNode::latencyTime() const
119{
120 return m_dynamicsCompressor->latencyTime();
121}
122
123} // namespace WebCore
124
125#endif // ENABLE(WEB_AUDIO)
126