vail/static/scripts/audio.mjs

56 lines
1.0 KiB
JavaScript
Raw Normal View History

2023-01-16 17:29:17 -07:00
/**
* @file Provides some base audio tools.
*/
2023-01-17 12:25:20 -07:00
import * as time from "./time.mjs"
2023-01-16 17:29:17 -07:00
/**
* Compute the special "Audio Context" time
*
* This is is a duration from now, in seconds.
*
* @param {AudioContext} context
* @param {Date} when Date to compute
* @returns audiocontext time
*/
function AudioContextTime(context, when) {
if (!when) return 0
2023-01-17 12:25:20 -07:00
let acOffset = Date.now() - (context.currentTime * time.Second)
return Math.max(when - acOffset, 0) / time.Second
2023-01-16 17:29:17 -07:00
}
class AudioSource {
/**
* A generic audio source
*
* @param {AudioContext} context
*/
constructor(context) {
this.context = context
this.masterGain = new GainNode(this.context)
}
/**
* Connect to an audio node
*
* @param {AudioNode} destinationNode
*/
connect(destinationNode) {
this.masterGain.connect(destinationNode)
}
/**
* Set the master gain for this audio source.
*
* @param {Number} value New gain value
*/
SetGain(value) {
this.masterGain.gain.value = value
}
}
export {
AudioContextTime,
AudioSource,
}