SubsampleOffset.scala

// note: this doesn't demonstrate anything useful yet

SynthDef.recv("SubsampleOffset") {
  val addOff  = "addOff".kr(3)
  val in      = Impulse.ar(2) * 0.3       // some input.
  val sampDur = SampleDur.ir              // duration of one sample
  val pad     = 4                         // DelayC needs at least 4 samples buffer
  val sampOff = 1 - SubsampleOffset.ir +  // balance out subsample offset
    MouseX.kr(0, addOff)                  // add a mouse dependent offset
  
  // cubic resampling
  val resampled = DelayC.ar(in,
    maxDelayTime = sampDur * (1       + pad),
    delayTime    = sampDur * (sampOff + pad)
  )
  OffsetOut.ar("out".kr, resampled)
}

// create 2 pulse trains 1 sample apart, move one relatively to the other.
// when cursor is at the left, the impulses are adjacent, on the right, they are
// exactly 1 sample apart.

val dt = s.sampleRate.reciprocal // 1 sample delay

val x1, x2 = Synth(s)

val SECONDS_FROM_1900_TO_1970 = 2208988800L

// execute the following three lines together
val t0 = System.currentTimeMillis * 0.001 + SECONDS_FROM_1900_TO_1970
s ! osc.Bundle.secs(t0 + 0.2      , x1.newMsg("SubsampleOffset", args = List("out" -> 0)))
s ! osc.Bundle.secs(t0 + 0.2 + dt , x2.newMsg("SubsampleOffset", args = List("out" -> 1)))