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29 #include "modules/webaudio/DynamicsCompressorNode.h"
31 #include "platform/audio/DynamicsCompressor.h"
32 #include "modules/webaudio/AudioContext.h"
33 #include "modules/webaudio/AudioNodeInput.h"
34 #include "modules/webaudio/AudioNodeOutput.h"
36 // Set output to stereo by default.
37 static const unsigned defaultNumberOfOutputChannels = 2;
41 DynamicsCompressorNode::DynamicsCompressorNode(AudioContext* context, float sampleRate)
42 : AudioNode(context, sampleRate)
44 ScriptWrappable::init(this);
45 addInput(adoptPtr(new AudioNodeInput(this)));
46 addOutput(adoptPtr(new AudioNodeOutput(this, defaultNumberOfOutputChannels)));
48 setNodeType(NodeTypeDynamicsCompressor);
50 m_threshold = AudioParam::create(context, "threshold", -24, -100, 0);
51 m_knee = AudioParam::create(context, "knee", 30, 0, 40);
52 m_ratio = AudioParam::create(context, "ratio", 12, 1, 20);
53 m_reduction = AudioParam::create(context, "reduction", 0, -20, 0);
54 m_attack = AudioParam::create(context, "attack", 0.003, 0, 1);
55 m_release = AudioParam::create(context, "release", 0.250, 0, 1);
60 DynamicsCompressorNode::~DynamicsCompressorNode()
65 void DynamicsCompressorNode::process(size_t framesToProcess)
67 AudioBus* outputBus = output(0)->bus();
70 float threshold = m_threshold->value();
71 float knee = m_knee->value();
72 float ratio = m_ratio->value();
73 float attack = m_attack->value();
74 float release = m_release->value();
76 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
77 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
78 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
79 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
80 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
82 m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
84 float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
85 m_reduction->setValue(reduction);
88 void DynamicsCompressorNode::initialize()
93 AudioNode::initialize();
94 m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels));
97 void DynamicsCompressorNode::uninitialize()
102 m_dynamicsCompressor.clear();
103 AudioNode::uninitialize();
106 double DynamicsCompressorNode::tailTime() const
108 return m_dynamicsCompressor->tailTime();
111 double DynamicsCompressorNode::latencyTime() const
113 return m_dynamicsCompressor->latencyTime();
116 void DynamicsCompressorNode::trace(Visitor* visitor)
118 visitor->trace(m_threshold);
119 visitor->trace(m_knee);
120 visitor->trace(m_ratio);
121 visitor->trace(m_reduction);
122 visitor->trace(m_attack);
123 visitor->trace(m_release);
124 AudioNode::trace(visitor);
127 } // namespace WebCore
129 #endif // ENABLE(WEB_AUDIO)