2.2.5 • Published 8 years ago
audio-slot-param v2.2.5
audio-slot-param
Link and transform schedule-based observables and connect to AudioParams (Web Audio API).
Params are instances of observ-node-array/single.
Example
var Param = require('audio-slot-param')
var apply = require('audio-slot-param/apply')
var context = {
audio: new AudioContext(), // Web Audio
nodes: {
lfo: require('audio-slot/modulators/lfo')
}
}
var frequency = Param(context, 440)
var osc = audioContext.createOscillator()
var unapply = apply(context, osc.frequency, frequency)
osc.connect(context.audio.destination)
osc.start()
// set the value explicitly:
frequency.set(220)
// modulate with an LFO
frequency.set({
node: 'lfo',
mode: 'add',
amp: 50,
value: 220,
rate: 8, // hz
trigger: false
})
Transforms
var Transform = require('audio-slot-param/transform')
var pitch = Param(context, 0)
var octave = Param(context, 0)
var frequency = Transform(context, [ 440, // base freq
{ param: obs.octave, transform: transformOctave },
{ param: obs.noteOffset, transform: transformNote }
])
apply(context, osc.frequency, frequency)
octave.set(-1)
pitch.set(4)
osc.frequency.value //= 277.1826309768721
// or as above, we can specify a modulator instead of explicit value:
pitch.set({
node: 'lfo',
mode: 'add',
amp: 1,
value: 4,
rate: 8, // hz
trigger: false
})
function transformOctave(baseFrequency, value){
return baseFrequency * Math.pow(2, value)
}
function transformNote(baseFrequency, value){
return baseFrequency * Math.pow(2, value / 12)
}
Param Proxy
Creates a placeholder param that can be swapped for a real param later.
var Proxy = require('audio-slot-param/proxy')
var param = Proxy(context, 440)
apply(context, osc.frequency, param)
// then later on swap:
var target = LFO(context)
param.set(target)
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