Clemens, thanks very much for your advice. But it seems that the dshare
plugin can only slave to an actual hardware device:
---
$ aplay -Dcenter /tmp/foo.wav
ALSA lib pcm_dshare.c:578:(snd_pcm_dshare_open) dshare plugin can be only
connected to hw plugin
Segmentation fault
---
Trying another plugin and starting with your example, I can get the route
plugin to route to the proper channels, but of course I lose sharing. :(
Here is that .asoundrc:
---
pcm.routed_l_r {
type route
slave.pcm surround51
ttable.0.0 1
ttable.1.1 1
}
pcm.routed_c {
type route
slave.pcm surround51
ttable.0.4 1
}
pcm.l_r {
type plug
slave.pcm routed_l_r
}
pcm.center {
type plug
slave.pcm routed_c
}
---
Do you see any way to add sharing into this config?
Will the "share" plugin work? Is aserver deprecated?
Thanks again for your help!
John
Clemens Ladisch said:
> John W. Cocula wrote:
>> Let me clarify: the real issue is *mixing* normal stereo out the L and R
>> channels, while a mono channel is also coming out the center speaker.
>> So,
>> like dmix, but dmix only works with the first 2 channels? Any solutions
>> short of using JACK?
>>
>> The following fragment works to drive only the center channel, but other
>> ALSA players block.
>>
>> pcm.voice {
>> type plug
>> slave {
>> pcm "surround51"
>> }
>> ttable.0.4 1
>> }
>
> You don't need dmix for this, because you don't want to mix several
> sources to the same channel. Try something like this (untested):
>
> pcm_slave.slave51 {
> pcm surround51
> channels 6
> rate 48000 # not sure if this is needed
> }
>
> pcm.shared_l_r {
> type dshare
> slave.pcm slave51
> ipc_key 123456
> bindings {
> 0 0
> 1 1
> }
> }
>
> pcm.shared_c {
> type dshare
> slave.pcm slave51
> ipc_key 123456
> bindings {
> 0 4
> }
> }
>
> pcm.l_r { # same as shared_l_r, but for other sample rates etc.
> type plug
> slave.pcm shared_l_r
> }
>
> pcm.center {
> type plug
> slave.pcm shared_c
> }
>
>
> HTH
> Clemens
>
>
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