[PlanetCCRMA] Help: Alsa & Jack

[Fernando Lopez-Lezcano]

On Sat, 2005-04-02 at 23:31, Gregory McCourt wrote:
> Hello. I'm new to the Planet and FC3, and my previous experience was with doing 
> extemporaneous work using csound on RH. I'm sure there is just something I'm 
> overlooking here as nobody else seems to be having a problem with jackd. 
> I'm using the current stable kernel of Planet (but want to try the Edge) 
> on recent P4 hardware with an all SCSI subsystem (less fd and cdrom). 
> My soundcard is one of the newer SB Live 7.1 24bit:
> 
> [admin@ip-61 ~]$ cat /proc/asound/cards
> 0 [CA0106         ]: CA0106 - CA0106
>                      Live! 7.1 24bit [SB0410] at 0xdf80 irq 20
> 
> 
> Oddly, if I restart, or stop and start, alsa i get the following:
> [root@ip-61 admin]# /etc/rc.d/init.d/alsasound restart
> Shutting down sound driver                                 [  OK  ]
> Starting sound driver snd-ca0106                           [  OK  ]
> Starting sequencer                                         [  OK  ]
> Restoring sound driver settings /usr/sbin/alsactl: load_state:1272: No soundcards found...
>                                                            [FAILED]
> [root@ip-61 admin]# /etc/rc.d/init.d/alsasound start
> ALSA driver already running
> Starting sound driver snd-ca0106                           [  OK  ]
> Starting sequencer                                         [  OK  ]
> Restoring sound driver settings                            [  OK  ]
> [root@ip-61 admin]# /etc/rc.d/init.d/alsasound stop
> Shutting down sound driver                                 [  OK  ]
> [root@ip-61 admin]# /etc/rc.d/init.d/alsasound start
> Starting sound driver snd-ca0106                           [  OK  ]
> Starting sequencer                                         [  OK  ]
> Restoring sound driver settings /usr/sbin/alsactl: load_state:1272: No soundcards found...
>                                                            [FAILED]
> 
> Notice that if I start again after the failed restart I get no error. I've been able to play audio from snd and ogg123, so I am getting output.
> 
> I apt-got qjackctl and started jack from there.
> 
> Commandline Warning:
> 
> Warning: no locale found: /usr/share/locale/qjackctl_en_US.UTF-8.qm
> 
> qjackctl message log:
> 
> 14:02:23.948 Patchbay deactivated.
> 14:02:24.224 Statistics reset.
> 14:02:24.229 Could not open ALSA sequencer as a client. MIDI patchbay will be not available.
> ALSA lib seq_hw.c:451:(snd_seq_hw_open) open /dev/snd/seq failed: No such file or directory
> 14:02:57.770 Startup script...
> 14:02:57.770 artsshell -q terminate
> 14:02:58.039 Startup script terminated with exit status=256.
> 14:02:58.039 JACK is starting...
> 14:02:58.039 /usr/bin/jackd -R -dalsa -dhw:0 -r48000 -p1024 -n2
> 14:02:58.052 JACK was started with PID=5217 (0x1461).
> jackd 0.99.36
> Copyright 2001-2003 Paul Davis and others.
> jackd comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> JACK compiled with System V SHM support.
> loading driver ..
> apparent rate = 48000
> creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
> control device hw:0
> configuring for 48000Hz, period = 1024 frames, buffer = 2 periods
> Couldn't open hw:0 for 32bit samples trying 24bit instead
> Couldn't open hw:0 for 24bit samples trying 16bit instead
> nperiods = 2 for capture
> nperiods = 2 for playback
> **** alsa_pcm: xrun of at least 0.022 msecs
> **** alsa_pcm: xrun of at least 0.024 msecs
> 
> ...and xruns there after.
> 
> What am I doing wrong here? 

It does not look like you are doing anything wrong. I may be that your
card is not happy with the parameter you are choosing. The first thing I
would try is to increase the number of periods from 2 to 3, and/or
decrease the period size to 512. 

-- Fernando