#include <stdio.h>
#include <fcntl.h>

void main(argc, argv)
int argc;
char *argv[];
{
  FILE *f, *g;
  short words[16384];
  int a, start=0, end=0;

  /* try to open the audio file */
  if(argc != 3)
    exit(1);

  if(!(f=fopen(argv[1], "r"))) {
    perror(argv[1]);
    exit(1);
  } if(!(g=fopen(argv[2], "w"))) {
    perror(argv[2]);
    exit(1);
  }

  fseek(f, 100, SEEK_SET);
  while(!start && fread(words, 2, 16384, f))
    for(a=0;a<16384;a+=2)
      if(words[a] < -500 || words[a] > 500 ||
         words[a+1] < -500 || words[a+1] > 500) {
        start=ftell(f)-(32768-(a*2));
        break;
      }

  fseek(f, -32768, SEEK_END);
  while(!end) {
    fread(words, 2, 16384, f);
    for(a=16382;a>=0;a-=2)
      if(words[a] < -500 || words[a] > 500 ||
         words[a+1] < -500 || words[a+1] > 500) {
        end=(ftell(f)-(32768-(a*2)))-start;
        break;
      }
    fseek(f, -65536, SEEK_CUR);
  }

  printf("Start: %d. Length: %d\n", start, end);
  fseek(f, start, SEEK_SET);

  while((a=fread(words, 1, (end > 32768)?32768:end, f))) {
    fwrite(words, 1, a, g);
    if((end-=32768) < 0)
      end=0;
  }
  fflush(g);
}