int offset = 0;
class MyTable implements AudioSignal {
  int high;
  int low;
  int count = 0;
  int pos;
  boolean start = true;
  int amp = 0;

  void generate(float[] samp) { 
    for (int x = 0; x < samp.length; x++) {
      for(int y=0;y<100;y++) {
        pos = x * 100 + y;
        color c = img.get(x, y);
        if(red(c)<=50) {
          imgArray[pos] = pos;
        } 
        else {
          imgArray[pos] = 0;
        }
        sndArray[y] = imgArray[pos];
      }

      high = sndArray[0];

      for(int i=0;i<100;i++) {
        if(sndArray[i]>0 && start) {
          low = sndArray[i];
          start = !start;
        } 
        else if(sndArray[i]==0 && start) {
          offset++;
        }
        if(sndArray[i]>high) {
          high = sndArray[i];
        }
      }

      if(high>0 && low>0) {
        amp = high-low+offset;
        
        if(x%2==1) {
          //top edge
          samp[x] = map(offset, 1, 100, 1, 0);
        } 
        else {
          //bottom edge
          samp[x] = map(amp, 1, 100, 1, 0);
        }
      } 
      else {
        amp = 0;
        samp[x] = amp;
      }
      start = !start;
      offset = 0;
    }
  }

  // this is a stricly mono signal
  void generate(float[] left, float[] right) {
    generate(left);
    generate(right);
  }
}