Re: [Alsa-devel] sblive 4ch output w/ jack - asoundrc magic?

[Joern Nettingsmeier <nettings@folkwang-hochschule.de>]

Takashi Iwai wrote:
> At Thu, 05 Feb 2004 00:08:18 +0100,
> Joern Nettingsmeier wrote:
> 
>>[crossposted to alsa-devel and jackit-devel]
>>
>>hi *!
>>
>>i'd like to use the rear outs of my sblive platinum with jack.
>>
>>the following works:
>># aplay some.wav -Dfront &
>># aplay someother.wav -Drear
>>both signals end up at my mixer as expected, so it seems the devices 
>>are independent.
>>
>>front is hw:0,0 which is a duplex device.
>>rear is hw:0,3 and is playback only.
> 
>  
> hmm?  hw:0,3 isn't for the rear output...
> 
> there is already a standard definition for 4.0 output, "surround40".
> so, something like below would be better:
> 
> 	ctl.jtest {
> 		type hw
> 		card 0
> 	}
> 
> 	pcm.jtest {
> 		type asym
> 		playback.pcm {
> 			# route for mmap workaround
> 			type route
> 			slave.pcm surround40
> 			ttable.0.0 1
> 			ttable.1.1 1
> 			ttable.2.2 1
> 			ttable.3.3 1
> 		}
> 		capture.pcm {
> 			# 2 channels only
> 			type hw
> 			card 0
> 		}
> 	}
> 
> and run jack with -d jtest -i 2 -o 6 options.

you probably meant "-o 4", right?

works like a charm so far, many thanks!
jackd spits out a warning, though:

ALSA lib pcm.c:1168:(snd_pcm_link) SNDRV_PCM_IOCTL_LINK failed: 
Operation already in progress


i'll play with it for a while, and then i'll send it to patrick for 
inclusion in the alsa docs...


time to play :-D

jörn


-- 
"I never use EQ, never, never, never. I previously used to use mic
positioning but I've even given up on that too."
	- Jezar on http://www.audiomelody.com


Jörn Nettingsmeier
Kurfürstenstr 49, 45138 Essen, Germany
http://spunk.dnsalias.org (my server)
http://www.linuxaudiodev.org (Linux Audio Developers)





-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn