libavdevice/audio.c:279: error: Uninitialized Value
  The value read from ret was never initialized.

libavdevice/audio.c:279:5: 
277.     /* compute pts of the start of the packet */
278.     cur_time = av_gettime();
279.     bdelay = ret;
         ^
280.     if (ioctl(s->fd, SNDCTL_DSP_GETISPACE, &abufi) == 0) {
281.         bdelay += abufi.bytes;
