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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