On Fri, May 18, 2018 at 06:07:29PM +0530, Muni Sekhar wrote: > [ Please keep me in CC as I'm not subscribed to the list] > > Hi All, > > I am trying to characterize the audio synchronization between two > systems. There is a mechanism to route audio between two systems, we > run ‘aplay’ at one system and ‘arecord’ in other system. > > We need to measure the time difference when audio sample is out at one > port and arriving at another port in different system. > > I plan to add printk’s in “struct snd_pcm_ops” call backs, but does > these call backs tells when it received first and last audio > frames\samples? > > Or else please suggest any other best method. First off you need a "shared timer/clock" between the two systems in order to have a chance to determine what actually happens here. Good luck with that! :) Also, there's been tons of research in this area over the years, please look into that, odds are these problems have been solved already. I know of several commercial devices that already handle this just fine. best of luck! greg k-h _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
