This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The numberOfInputs property of the AudioNode interface returns the number of inputs feeding the node. Source nodes are defined as nodes having a numberOfInputs property with a value of 0.
An integer ≥ 0.
const audioCtx = new AudioContext(); const oscillator = audioCtx.createOscillator(); const gainNode = audioCtx.createGain(); oscillator.connect(gainNode).connect(audioCtx.destination); console.log(oscillator.numberOfInputs); // 0 console.log(gainNode.numberOfInputs); // 1 console.log(audioCtx.destination.numberOfInputs); // 1
| Specification |
|---|
| Web Audio API> # dom-audionode-numberofinputs> |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Opera | Safari | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | WebView Android | WebView on iOS | |
numberOfInputs |
14 | 12 | 25 | 15 | 6 | 18 | 25 | 14 | 6 | 1.0 | 4.4.3 | 6 |
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https://developer.mozilla.org/en-US/docs/Web/API/AudioNode/numberOfInputs