stew

a monorepo of some sort
git clone git://git.nsmpr.xyz/stew.git
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extract.c (380B)

      1 /*
      2  * Extracts first channel from 16-bit stereo PCM input.
      3  * Output is 16-bit mono, naturally.
      4  */
      5 
      6 #include<u.h>
      7 #include<libc.h>
      8 
      9 void
     10 main(void)
     11 {
     12 	long i, n;
     13 	s16int buf[4096];
     14 	while ((n = read(0, buf, 4096 * sizeof(s16int))) > 0) {
     15 		for (i = 0; i <= n / sizeof(s16int) / 2; i += 1) {
     16 			buf[i] = buf[i * 2];
     17 		}
     18 		if (write(1, buf, n / 2) <= 0) exits("can't write");
     19 	}
     20 }