1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/*
* Copyright (C) 2011, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(WEB_AUDIO)
#include "DynamicsCompressorNode.h"
#include "AudioContext.h"
#include "AudioNodeInput.h"
#include "AudioNodeOutput.h"
#include "DynamicsCompressor.h"
// Set output to stereo by default.
static const unsigned defaultNumberOfOutputChannels = 2;
namespace WebCore {
DynamicsCompressorNode::DynamicsCompressorNode(AudioContext* context, float sampleRate)
: AudioNode(context, sampleRate)
{
addInput(adoptPtr(new AudioNodeInput(this)));
addOutput(adoptPtr(new AudioNodeOutput(this, defaultNumberOfOutputChannels)));
setNodeType(NodeTypeDynamicsCompressor);
m_threshold = AudioParam::create(context, "threshold", -24, -100, 0);
m_knee = AudioParam::create(context, "knee", 30, 0, 40);
m_ratio = AudioParam::create(context, "ratio", 12, 1, 20);
m_reduction = AudioParam::create(context, "reduction", 0, -20, 0);
m_attack = AudioParam::create(context, "attack", 0.003, 0, 1);
m_release = AudioParam::create(context, "release", 0.250, 0, 1);
initialize();
}
DynamicsCompressorNode::~DynamicsCompressorNode()
{
uninitialize();
}
void DynamicsCompressorNode::process(size_t framesToProcess)
{
AudioBus* outputBus = output(0)->bus();
ASSERT(outputBus);
float threshold = m_threshold->value();
float knee = m_knee->value();
float ratio = m_ratio->value();
float attack = m_attack->value();
float release = m_release->value();
m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
m_reduction->setValue(reduction);
}
void DynamicsCompressorNode::reset()
{
m_dynamicsCompressor->reset();
}
void DynamicsCompressorNode::initialize()
{
if (isInitialized())
return;
AudioNode::initialize();
m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels));
}
void DynamicsCompressorNode::uninitialize()
{
if (!isInitialized())
return;
m_dynamicsCompressor.clear();
AudioNode::uninitialize();
}
double DynamicsCompressorNode::tailTime() const
{
return m_dynamicsCompressor->tailTime();
}
double DynamicsCompressorNode::latencyTime() const
{
return m_dynamicsCompressor->latencyTime();
}
} // namespace WebCore
#endif // ENABLE(WEB_AUDIO)
|
