I guess the problem is that none of the right side variables/constant is unsigned in: so regardless of storing it in an unsigned, it overflows before you try to store it, and so it messes up everything. Note that you could also prevent this by using the correct constant 10000000U Victor On 7 Dec 2009, at 19:22, Mario Lang wrote: > Hi. > > I just happened to stumble about a (what I call) pretty subtle > bug in typical ALSA PCM code: > > root@fzidpc73:/tmp# cat test.c > #include <stdio.h> > int main() { > int period = 1024; > int nperiods = 3; > int rate = 96000; > printf("%d\n", buffer_time); > } > root@fzidpc73:/tmp# ./test > -12739 > root@fzidpc73:/tmp# sed -i -e 's/int rate/unsigned int rate/' test.c > root@fzidpc73:/tmp# gcc -o test test.c > root@fzidpc73:/tmp# ./test > 32000 > > I.e., don't trust this boilerplate formula blindly. > > -- > CYa, > ⡍⠁⠗⠊⠕ > _______________________________________________ > Linux-audio-dev mailing list > Linux-audio-dev(a)lists.linuxaudio.org > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev