AnalyserNode class abstract

The AnalyserNode represents a node able to provide real-time frequency and time-domain analysis information. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations.

An AnalyserNode has exactly one input and one output. The node works even if the output is not connected.

Without modifying the audio stream, the node allows to get the frequency and time-domain data associated to it, using a FFT.

Number of inputs 1
Number of outputs 1 (but may be left unconnected)
Channel count mode "max"
Channel count 2
Channel interpretation "speakers"

API documentation sourced from MDN Web Docs.

Implemented types

Constructors

AnalyserNode()

Properties

channelCount ↔ int
The channelCount property of the AudioNode represents an integer used to determine how many channels are used when up-mixing and down-mixing connections to any inputs to the node.
getter/setter pairinherited
channelCountMode ↔ ChannelCountMode
The channelCountMode property of the AudioNode represents an enumerated value describing the way channels must be matched between the node's inputs and outputs.
getter/setter pairinherited
channelInterpretation ↔ ChannelInterpretation
The channelInterpretation property of the AudioNode interface represents an enumerated value describing how input channels are mapped to output channels when the number of inputs/outputs is different. For example, this setting defines how a mono input will be up-mixed to a stereo or 5.1 channel output, or how a quad channel input will be down-mixed to a stereo or mono output.
getter/setter pairinherited
context → BaseAudioContext
The read-only context property of the AudioNode returns the associated BaseAudioContext, that is the object representing the processing graph the node is participating in.
no setterinherited
fftSize ↔ int
The fftSize property of the AnalyserNode is an unsigned long value and represents the window size in samples that is used when performing a Fast Fourier Transform (FFT) to get frequency domain data.
getter/setter pair
frequencyBinCount → int
The frequencyBinCount read-only property of the AnalyserNode contains the total number of data points available to AudioContext BaseAudioContext.sampleRate. This is half of the value of the AnalyserNode.fftSize. The two methods' indices have a linear relationship with the frequencies they represent, between 0 and the Nyquist frequency.
no setter
hashCode → int
The hash code for this object.
no setterinherited
maxDecibels ↔ double
The maxDecibels property of the AnalyserNode is a double value representing the maximum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the maximum value for the range of results when using getByteFrequencyData().
getter/setter pair
minDecibels ↔ double
The minDecibels property of the AnalyserNode is a double value representing the minimum power value in the scaling range for the FFT analysis data, for conversion to unsigned byte values — basically, this specifies the minimum value for the range of results when using getByteFrequencyData().
getter/setter pair
numberOfInputs → int
The numberOfInputs property of the AudioNode returns the number of inputs feeding the node. Source nodes are defined as nodes having a numberOfInputs property with a value of 0.
no setterinherited
numberOfOutputs → int
The numberOfOutputs property of the AudioNode returns the number of outputs coming out of the node. Destination nodes — like AudioDestinationNode — have a value of 0 for this attribute.
no setterinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
smoothingTimeConstant ↔ TauTime
The smoothingTimeConstant property of the AnalyserNode interface is a double value representing the averaging constant with the last analysis frame. It's basically an average between the current buffer and the last buffer the AnalyserNode processed, and results in a much smoother set of value changes over time.
getter/setter pair

Methods

connect(AudioNode destinationNode, [int output, int input]) → AudioNode
The connect() method of the AudioNode lets you connect one of the node's outputs to a target, which may be either another AudioNode (thereby directing the sound data to the specified node). See also AudioNode.connectParam
inherited
connectParam(AudioParam destinationParam, [int output, int input]) → void
This is a variant of AudioNode.connect with a DestinationParam argument instead of an AudioNode. Note : The W3C recommandation uses just one verb for both.
inherited
disconnect([AudioNode destinationParamOrOutput, int output, int input]) → void
The disconnect() method of the AudioNode lets you disconnect one or more nodes from the node on which the method is called. See also AudioNode.disconnectParam
inherited
disconnectParam(AudioParam destinationParam, [int output, int input]) → void
This is a variant of AudioNode.disconnect with a DestinationParam argument instead of an AudioNode. Note : The W3C recommandation uses just one verb for both.
inherited
getByteFrequencyData(TauUint8Array array) → void
The getByteFrequencyData() method of the AnalyserNode interface copies the current frequency data into a Uint8Array (unsigned byte array) passed into it.
getByteTimeDomainData(TauUint8Array array) → void
The getByteTimeDomainData() method of the AnalyserNode Interface copies the current waveform, or time-domain, data into a Uint8Array (unsigned byte array) passed into it.
getFloatFrequencyData(TauFloat32Array array) → void
The getFloatFrequencyData() method of the AnalyserNode Interface copies the current frequency data into a Float32Array array passed into it. Each array value is a sample, the magnitude of the signal at a particular time.
getFloatTimeDomainData(TauFloat32Array array) → void
The getFloatTimeDomainData() method of the AnalyserNode Interface copies the current waveform, or time-domain, data into a Float32Array array passed into it. Each array value is a sample, the magnitude of the signal at a particular time.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
toString() → String
A string representation of this object.
inherited

Operators

operator ==(Object other) → bool
The equality operator.
inherited