A NOTE has been added to this issue. ====================================================================== <https://bugtrack.alsa-project.org/alsa-bug/view.php?id=2210> ====================================================================== Reported By: cmorgan Assigned To: perex ====================================================================== Project: ALSA - driver Issue ID: 2210 Category: 0_compilation problem_!!! Reproducibility: always Severity: major Priority: normal Status: assigned Distribution: Debian Kernel Version: 2.6.16-2-amd64-k8 (Debian 2.6.16-14) ====================================================================== Date Submitted: 06-14-2006 23:56 CEST Last Modified: 06-15-2006 02:47 CEST ====================================================================== Summary: poll() behaving anomalously, returning alternate streams on each interrupt, playback then capture but never both together Description: poll() behaving anomalously, returning alternate streams on each interrupt, playback then capture but never both together. Causes jack audio server to be unable to play back audio. Running jack with the alsa plugin and giving it the -P option puts the jack alsa driver into playback only mode. This makes jack work again. ====================================================================== ---------------------------------------------------------------------- rlrevell - 06-15-06 00:31 ---------------------------------------------------------------------- That's normal behavior - on most sound cards the capture and playback are independent. JACK should handle it. I think it might be a bug in JACK. What exactly are the symptoms - "it doesn't work" is not helpful. Please post the exact error messages. ---------------------------------------------------------------------- cmorgan - 06-15-06 02:47 ---------------------------------------------------------------------- I apologize for not providing more information. I haven't developed with alsa before so its tough to know what is enough information to provide. Here is the trace from the case where jackd is poll()ing on playback and capture: 1150332186452694: checked 1 fds, 22954 usecs since poll entered capture: revents & POLLERR, setting xrun_detected 1150332186452694 capture stream ready capture_avail == -EPIPE, setting xrun_detected playback_avail == -EPIPE, setting xrun_detected xrun_detected, calling alsa_driver_xrun_recovery() and returning 0 1150332186529668: checked 2 fds, 20899 usecs since poll entered 1150332186529668 playback stream ready 1150332186529668 capture stream timed out 1150332186556790: checked 1 fds, 27109 usecs since poll entered capture: revents & POLLERR, setting xrun_detected 1150332186556790 capture stream ready capture_avail == -EPIPE, setting xrun_detected playback_avail == -EPIPE, setting xrun_detected xrun_detected, calling alsa_driver_xrun_recovery() and returning 0 1150332186636694: checked 2 fds, 23851 usecs since poll entered ... and the one from just playback: 1150332304773422: checked 1 fds, 21313 usecs since poll entered 1150332304773422 playback stream ready wakeup complete, avail = 1024, pavail = 1024 cavail = 2147483647 1150332304794754: checked 1 fds, 21318 usecs since poll entered 1150332304794754 playback stream ready wakeup complete, avail = 1024, pavail = 1024 cavail = 2147483647 1150332304816085: checked 1 fds, 21315 usecs since poll entered 1150332304816085 playback stream ready wakeup complete, avail = 1024, pavail = 1024 cavail = 2147483647 1150332304837422: checked 1 fds, 21320 usecs since poll entered ... So, in the case of just playback jack doesn't detect an xrun every other poll() and works like it should Chris Issue History Date Modified Username Field Change ====================================================================== 06-14-06 23:56 cmorgan New Issue 06-14-06 23:56 cmorgan Distribution => Debian 06-14-06 23:56 cmorgan Kernel Version => 2.6.16-2-amd64-k8 (Debian 2.6.16-14) 06-15-06 00:31 rlrevell Note Added: 0010217 06-15-06 02:47 cmorgan Note Added: 0010224 ====================================================================== _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
