It doesn't matter actually. If read pointers of the sound cards are accessible, then one of the soundcards can be considered as the reference one and "absolute" time can be measured as
(buffer_size * number_of_fully_read_buffers) + read_pointer - I mean, read_pointer has the range of 0..buffer_size - 1. On Sat, 31 Dec 2005 12:53:58 -0800 (PST) Bill Unruh <[EMAIL PROTECTED]> wrote: > As I understand it, the new HPET timers are sufficiently different from the > old RTC chips, that the RTC timer has gotten screwed up in the transition. > Ie, you could use the new hpet fuctionality and it would work well. > Unfortunately no software does. It uses the old RTC interface, and that as > I understand it is worse under the new chipsets than it even was under the > old. > > I may quite possibly be all wet in this. > > On Sat, 31 Dec 2005, Lee Revell wrote: > > > On Sat, 2005-12-31 at 12:36 -0800, Bill Unruh wrote: > >> But the problem is getting those ticks out. In particular, with the > >> new timer chips on the newer chipsets, rtc works by polling, which is > >> notoriously bad at accurate timing. Even with interrupts, you cannot > >> have them too often or your computer will not do much, and the timer > >> interrupt could be delayed. Ie, your computer does a whole lot of > >> stuff besides audio all of which can interfer with the > >> timing. > > > > What RTC chipsets are you referring to that can't generate periodic > > interrupts? > > > > > > > > ------------------------------------------------------- > > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > > for problems? Stop! Download the new AJAX search engine that makes > > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > > http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click > > _______________________________________________ > > Alsa-user mailing list > > Alsa-user@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/alsa-user > > > > -- > William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273 > Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324 > UBC, Vancouver,BC | Program in Cosmology | [EMAIL PROTECTED] > Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/ > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click > _______________________________________________ > Alsa-user mailing list > Alsa-user@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/alsa-user > ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://ads.osdn.com/?ad_id=7637&alloc_id=16865&op=click _______________________________________________ Alsa-user mailing list Alsa-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/alsa-user
