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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);
46 addOutput(AudioNodeOutput::create(this, defaultNumberOfOutputChannels));
48 setNodeType(NodeTypeDynamicsCompressor);
50 m_threshold = AudioParam::create(context, -24);
51 m_knee = AudioParam::create(context, 30);
52 m_ratio = AudioParam::create(context, 12);
53 m_reduction = AudioParam::create(context, 0);
54 m_attack = AudioParam::create(context, 0.003);
55 m_release = AudioParam::create(context, 0.250);
60 DynamicsCompressorNode::~DynamicsCompressorNode()
62 ASSERT(!isInitialized());
65 void DynamicsCompressorNode::dispose()
71 void DynamicsCompressorNode::process(size_t framesToProcess)
73 AudioBus* outputBus = output(0)->bus();
76 float threshold = m_threshold->value();
77 float knee = m_knee->value();
78 float ratio = m_ratio->value();
79 float attack = m_attack->value();
80 float release = m_release->value();
82 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
83 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
84 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
85 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
86 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
88 m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
90 float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
91 m_reduction->setValue(reduction);
94 void DynamicsCompressorNode::initialize()
99 AudioNode::initialize();
100 m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels));
103 void DynamicsCompressorNode::uninitialize()
105 if (!isInitialized())
108 m_dynamicsCompressor.clear();
109 AudioNode::uninitialize();
112 double DynamicsCompressorNode::tailTime() const
114 return m_dynamicsCompressor->tailTime();
117 double DynamicsCompressorNode::latencyTime() const
119 return m_dynamicsCompressor->latencyTime();
122 void DynamicsCompressorNode::trace(Visitor* visitor)
124 visitor->trace(m_threshold);
125 visitor->trace(m_knee);
126 visitor->trace(m_ratio);
127 visitor->trace(m_reduction);
128 visitor->trace(m_attack);
129 visitor->trace(m_release);
130 AudioNode::trace(visitor);
135 #endif // ENABLE(WEB_AUDIO)