[mythtv-users] Audio to 3 devices

[Karl Newman]

On Mon, Aug 18, 2014 at 12:59 PM, Josu Lazkano <josu.lazkano at gmail.com>
wrote:

> 2014-08-18 21:40 GMT+02:00 Karl Newman <newmank1 at asme.org>:
> >
> > Nicley done. I'm always baffled by the asoundrc syntax. Maybe you could
> > insert another 6-channel "multi" which sends one copy to the receiver
> with
> > all 6 channels and sends another copy to your "route", which then
> collapses
> > the 6 channels to 2, then chain the "route" to the existing "multi" (but
> > remove the receiver as a slave from that one).
> >
> > Karl
>
> Thanks Karl, but I don't know how to write this in the ".asound" file.
>
> Could someone help with the syntax?
>
> I'll give it a stab, going by
http://alsa.opensrc.org/Asoundrc#Dupe_output_to_multiple_cards as a guide.
Their solution is a little more concise than what I was thinking. Try this:

pcm.!default {
    type plug
    slave {
        pcm "both"
    }
}

pcm.both {
    type route
    slave.pcm {
        type multi
        slaves.a {
            pcm "receiver"
            channels 6
        }
        slaves.b {
            pcm "tv"
            channels 2
        }
        slaves.c {
            pcm "analog"
            channels 2
        }
        bindings.0.slave a
        bindings.0.channel 0
        bindings.1.slave a
        bindings.1.channel 1
        bindings.2.slave a
        bindings.2.channel 2
        bindings.3.slave a
        bindings.3.channel 3
        bindings.4.slave a
        bindings.4.channel 4
        bindings.5.slave a
        bindings.5.channel 5
        bindings.6.slave b
        bindings.6.channel 0
        bindings.7.slave b
        bindings.7.channel 1
        bindings.8.slave c
        bindings.8.channel 0
        bindings.9.slave c
        bindings.9.channel 1
    }

    ttable.0.0 1.0
    ttable.1.1 1.0
    ttable.2.2 1.0
    ttable.3.3 1.0
    ttable.4.4 1.0
    ttable.5.5 1.0
    ttable.6.0 1.0
    ttable.7.1 1.0
    ttable.8.0 1.0
    ttable.9.1 1.0
}

pcm.tv {
    type hw
    card 1
    device 7
    channels 2
}

pcm.receiver {
    type hw
    card 0
    device 1
    channels 2
}

pcm.analog {
    type hw
    card 0
    device 0
    channels 2
}

I have no idea if that many channels is acceptable in the multi or route
plugins. Also note that the "tv" and "analog" are getting only the front
left/right channels (but it was that way in your original file, too).

Karl
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