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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)
45 addOutput(AudioNodeOutput::create(this, defaultNumberOfOutputChannels));
47 setNodeType(NodeTypeDynamicsCompressor);
49 m_threshold = AudioParam::create(context, -24);
50 m_knee = AudioParam::create(context, 30);
51 m_ratio = AudioParam::create(context, 12);
52 m_reduction = AudioParam::create(context, 0);
53 m_attack = AudioParam::create(context, 0.003);
54 m_release = AudioParam::create(context, 0.250);
59 DynamicsCompressorNode::~DynamicsCompressorNode()
61 ASSERT(!isInitialized());
64 void DynamicsCompressorNode::dispose()
70 void DynamicsCompressorNode::process(size_t framesToProcess)
72 AudioBus* outputBus = output(0)->bus();
75 float threshold = m_threshold->value();
76 float knee = m_knee->value();
77 float ratio = m_ratio->value();
78 float attack = m_attack->value();
79 float release = m_release->value();
81 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamThreshold, threshold);
82 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamKnee, knee);
83 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRatio, ratio);
84 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamAttack, attack);
85 m_dynamicsCompressor->setParameterValue(DynamicsCompressor::ParamRelease, release);
87 m_dynamicsCompressor->process(input(0)->bus(), outputBus, framesToProcess);
89 float reduction = m_dynamicsCompressor->parameterValue(DynamicsCompressor::ParamReduction);
90 m_reduction->setValue(reduction);
93 void DynamicsCompressorNode::initialize()
98 AudioNode::initialize();
99 m_dynamicsCompressor = adoptPtr(new DynamicsCompressor(sampleRate(), defaultNumberOfOutputChannels));
102 void DynamicsCompressorNode::uninitialize()
104 if (!isInitialized())
107 m_dynamicsCompressor.clear();
108 AudioNode::uninitialize();
111 void DynamicsCompressorNode::clearInternalStateWhenDisabled()
113 m_reduction->setValue(0);
116 double DynamicsCompressorNode::tailTime() const
118 return m_dynamicsCompressor->tailTime();
121 double DynamicsCompressorNode::latencyTime() const
123 return m_dynamicsCompressor->latencyTime();
126 void DynamicsCompressorNode::trace(Visitor* visitor)
128 visitor->trace(m_threshold);
129 visitor->trace(m_knee);
130 visitor->trace(m_ratio);
131 visitor->trace(m_reduction);
132 visitor->trace(m_attack);
133 visitor->trace(m_release);
134 AudioNode::trace(visitor);
139 #endif // ENABLE(WEB_AUDIO)