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

[Takashi Iwai <tiwai@suse.de>]

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.


Takashi


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