WebAudio Kotlin

---

A library of KotlinJS externals for the WebAudio API. Currently still a Work In Progress.

Using

This library can be added as a local maven artifact. Clone, publish to Maven local and import it with gradle into your KotlinJS project. It then can be used directly.

Example

fun main() {
    /*
    The Audio Context can be created with a JS object. 
    This library includes a jsObject helper function
    to create JS objects.
     */
    val ctx = AudioContext(jsObject {
        latencyHint = "interactive"
        sampleRate = 44100
    })

    val osc = ctx.createOscillator()
    osc.type = "square"
    osc.frequency.setValueAtTime(440.0,ctx.currentTime)
    osc.start()

    val gain = ctx.createGain()
    gain.gain.setValueAtTime(0.0,ctx.currentTime)

    osc.connect(gain)
    gain.connect(ctx.destination)

    window.addEventListener("mousedown",{ e ->
        gain.gain.setValueAtTime(1.0,ctx.currentTime)
        console.log("mouse down")
    })
    window.addEventListener("mouseup",{ e ->
        gain.gain.setValueAtTime(0.0,ctx.currentTime)
        console.log("mouse up")
    })
}

Contributing

As this is just a library of externals, contributing is easy! If you see something that isn't here but is in the WebAudio API Docs, please do help out by filling in the external declarations.

Notes

For some reason, KotlinJS doesn't come with bindings for WebAudio. An issue has been brought up on Jetbrains's youtrack. But there has been no follow up.