GainNode
The GainNode
interface represents a change in volume. It is an AudioNode
audio-processing module that causes a given gain to be applied to the input data before its propagation to the output. A GainNode
always has exactly one input and one output, both with the same number of channels.
The gain is a unitless value, changing with time, that is multiplied to each corresponding sample of all input channels. If modified, the new gain is instantly applied, causing unaesthetic 'clicks' in the resulting audio. To prevent this from happening, never change the value directly but use the exponential interpolation methods on the AudioParam
interface.
Number of inputs | 1 |
---|---|
Number of outputs | 1 |
Channel count mode | "max" |
Channel count | 2 (not used in the default count mode) |
Channel interpretation | "speakers" |
Constructor
GainNode()
-
Creates and returns a new
GainNode
object. As an alternative, you can use theBaseAudioContext.createGain()
factory method; see Creating an AudioNode.
Instance properties
Inherits properties from its parent, AudioNode
.
GainNode.gain
Read only-
An a-rate
AudioParam
representing the amount of gain to apply. You have to setAudioParam.value
or use the methods ofAudioParam
to change the effect of gain.
Instance methods
No specific method; inherits methods from its parent, AudioNode
.
Example
See BaseAudioContext.createGain()
for example code showing how to use an AudioContext
to create a GainNode
.
Specifications
Specification |
---|
Web Audio API # GainNode |
Browser compatibility
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