Grace Baldonasa wrote: > After computing the rate, value could be of decimal format, In the computer, all values are binary. > is it rounded off to either equal or greater than the whole number > itself? There is no whole number, it is interpreted as a number with 16 binary fractional digits. > subs->freqmax = subs->freqn + (subs->freqn >> 2); > Q: why is subs->freqn shifted by 2 It's just subs->freqn plus 25 percent, and that is just some random value that should be safe enough for any real sample clock. > subs->phase = 0; > /* calculate the max. size of packet */ > maxsize = ((subs->freqmax + 0xffff) * (frame_bits >> 3)) >> 16; > > Q: why subs->freqmax is added with 0xffff, then frame_bits is shifted by 3 > then the whole thing shifted by 16. It's shifted by 16 to throw away the fractional digits; we calculate whole bytes. "frame_bits/8" is the number of bytes per frame. Adding 0xffff ensures that despite the truncation by the final shift, the value is rounded up. HTH Clemens ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
