genish.js/js/delay.js

gen~ in js

'use strict'

const gen  = require( './gen.js'  ),
      data = require( './data.js' ),
      poke = require( './poke.js' ),
      peek = require( './peek.js' ),
      sub  = require( './sub.js'  ),
      wrap = require( './wrap.js' ),
      accum= require( './accum.js'),
      memo = require( './memo.js' )

const proto = {
  basename:'delay',

  gen() {
    let inputs = gen.getInputs( this )
    
    gen.memo[ this.name ] = inputs[0]
    
    return inputs[0]
  },
}

const defaults = { size: 512, interp:'none' }

module.exports = ( in1, taps, properties ) => {
  const ugen = Object.create( proto )
  let writeIdx, readIdx, delaydata

  if( Array.isArray( taps ) === false ) taps = [ taps ]
  
  const props = Object.assign( {}, defaults, properties )

  const maxTapSize = Math.max( ...taps )
  if( props.size < maxTapSize ) props.size = maxTapSize

  delaydata = data( props.size )
  
  ugen.inputs = []

  writeIdx = accum( 1, 0, { max:props.size, min:0 })
  
  for( let i = 0; i < taps.length; i++ ) {
    ugen.inputs[ i ] = peek( delaydata, wrap( sub( writeIdx, taps[i] ), 0, props.size ),{ mode:'samples', interp:props.interp })
  }
  
  ugen.outputs = ugen.inputs // XXX ugh, Ugh, UGH! but i guess it works.

  poke( delaydata, in1, writeIdx )

  ugen.name = `${ugen.basename}${gen.getUID()}`

  return ugen
}