// Segregate tracks in channel space.
// Changes channel coding so that each track has its own private channel.
// First verifies that no track uses more than one channel.
#include <stdio.h>
#include <stdlib.h>
#include "h.h"
static int gcount(ui x) {int c=0; while(x){++c; x &= x-1;} return c;}
BP bp; note * mus = 0;
int main(){note * music = Read("", &bp); ui const tc=bp.trks;
unsigned short usg[tc];
{int j=tc; while(j--) usg[j] = 0;}
{void fed(note n){if(!n.trk || n.trk> tc) exit(printf("Foo\n"));
   if(n.dur!=OpaqueStuff) {usg[n.trk-1] |= 1<< (n.chan-1);}}
scan(fed, music, 0);
{int j=tc; int b = 0; while(j--) if(gcount(usg[j])>1) {b=1;
     printf("Track %d uses these channels: %04X\n", j+1, usg[j]);}
  if(b) exit(printf("No conversion performed\n"));}}
{void fed(note n){n.chan = n.trk; aug(n, &mus);}
scan(fed, music, 0);}

Write("nsh.midi", mus, &bp);
return 0;}