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.

EventTarget

AudioNode

ScriptProcessorNode

**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 ScriptProcessorNode stores the input in a buffer, send the audioprocess event. The EventHandler takes the input buffer and fill the output buffer which is sent to the output by the ScriptProcessorNode.](/en-US/docs/Web/API/ScriptProcessorNode/webaudioscriptprocessingnode.png)

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 the `onaudioprocess` 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 with JavaScript enabled. Enable JavaScript to view data.

See also
--------

* Using the Web Audio API