ScriptProcessorNode
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
The ScriptProcessorNode
interface allows the generation, processing, or analyzing of audio using JavaScript.
Note: This feature was replaced by AudioWorklets and the AudioWorkletNode
interface.
The ScriptProcessorNode
interface is an AudioNode
audio-processing module that is linked to two buffers, one containing the input audio data, one containing the processed output audio data. An event, implementing the AudioProcessingEvent
interface, is sent to the object each time the input buffer contains new data, and the event handler terminates when it has filled the output buffer with data.
The size of the input and output buffer are defined at the creation time, when the BaseAudioContext.createScriptProcessor
method is called (both are defined by BaseAudioContext.createScriptProcessor
's bufferSize
parameter). The buffer size must be a power of 2 between 256
and 16384
, that is 256
, 512
, 1024
, 2048
, 4096
, 8192
or 16384
. Small numbers lower the latency, but large number may be necessary to avoid audio breakup and glitches.
If the buffer size is not defined, which is recommended, the browser will pick one that its heuristic deems appropriate.
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" |
Instance properties
Inherits properties from its parent, AudioNode
.
ScriptProcessorNode.bufferSize
Read only Deprecated-
Returns an integer representing both the input and output buffer size. Its value can be a power of 2 value in the range
256
–16384
.
Instance methods
No specific methods; inherits methods from its parent, AudioNode
.
Events
Listen to these events using addEventListener()
or by assigning an event listener to the oneventname
property of this interface:
audioprocess
Deprecated-
Fired when an input buffer of a
ScriptProcessorNode
is ready to be processed. Also available via theonaudioprocess
event handler property.
Examples
See BaseAudioContext.createScriptProcessor()
for example code.
Specifications
Since the August 29, 2014 Web Audio API specification publication, this feature has been deprecated. It is no longer on track to become a standard.
It was replaced by AudioWorklets and the AudioWorkletNode
interface.
Browser compatibility
BCD tables only load in the browser