!7

import static x30_pkg.x30_util.VF1;

sclass AudioOutput > DynPrintLog {
  int bufSize = 40960;
  float gain = 1;
  transient playAudioFromSampleMakingFunction_AudioLoop loop;
  transient L<VF1<double[]>> sources = synchroList();
  transient SimpleLiveValue<Int> numSources = new(Int, 0);
  
  visualize {
    ret centerAndSouth(super.visualize(),
      vstackWithSpacing(
        withLabel("Volume (0-200%):", liveSliderZeroToOne(gain/2, voidfunc(float f) { setField(gain := f*2) })),
        jrightalignedline(withLabel("Sound sources:", jLiveValueLabel(numSources)))
      ));
  }
  
  start {
    ownTimer(loop = playAudioFromSampleMakingFunction(bufSize, voidfunc(double[] pair) {
      audio_makeSampleFromSources(sources, pair, gain)
    }));
  }
  
  void setNumSources { numSources.set(l(sources)); }

  // API
  
  void addSource(VF1<double[]> source) { sources.add(source); setNumSources(); }
  void removeSource(VF1<double[]> source) { sources.remove(source); setNumSources(); }
}