Re: [LAU] CM6206 S/PDIF JACK input

Hi Len!

Thanks for your reply but it seems like half an answer to me as you didn't
tell me what to do with the output of arecord -L?

I found a seemingly relevant thread on the LM forums where someone managed
to get their SPDIF working under JACK by writing a custom ALSA config file
but there wasn't quite enough hand-holding to get things working for me
unfortunately. I have posted all the previously mentioned info on my device
as well as the output of arecord -L to

http://linuxmusicians.com/viewtopic.php?f=27&t=8898

Thanks for your help Len and anyone else who can offer me any guidance here!

On Mon, Nov 12, 2012 at 9:00 PM, Len Ovens <len@email-addr-hidden> wrote:

>
> On Mon, November 12, 2012 12:11 pm, Dan MacDonald wrote:
> > Hello LA land!
> >
> > I got a Startech USB audio device based on the C-Media CM6206 purely in
> > the
> > hope of being able to use its S/PDIF input under JACK. It runs JACK just
> > fine, I just don't know how I might access the SPDIF input (or even the
> > line-in, just out of interest) from under JACK?
> >
> > When I run alsamixer and switch to viewing the capture ports of the
> cm6206
> > there are 4 capture channels - PCM, Line, Mic and S/PDIF In but under
> JACK
> > I only get 2 capture ports which are the L and R analogue mic input
> > channels. I can also see the light emitting from the S/PDIF out port so I
> > am confident the S/PDIF should work and hopefully under JACK.
>
> Ok, first thing to try is to make sure you can see the s/pdif inout with
> alsa. audacity or arecord should be able to record audio (audacity
> provides metering which may make things easier). alsamixer does not show
> capture ports it shows volume controls or switches. Often you would have 3
> or 4 inputs that are switched/mixed to give one stereo input. So making
> sure your s/pdif channel is on/unmuted/turned up is the first step. You
> may wish to mute Line and Mic while playing with it. You probably (from
> what you have said) have:
>
> Mic-------------\
> \
> Line----------| Mixer |------PCM------>ALSA-->Jack
> /
> S/PDIF----------/
>
> Each line here would be a stereo path (two Channels).
>
> In other words I think you will find there are only two input channels to
> ALSA.
>
>
> > card 2: Device [USB Sound Device], device 0: USB Audio [USB Audio]
> > Subdevices: 1/1
> > Subdevice #0: subdevice #0
>
> Assuming this is the device notice this doesn't shows number of channels.
>
> > 11: [ 2- 0]: digital audio playback
> > 12: [ 2- 0]: digital audio capture
> > 13: [ 2] : control
> > 33: : timer
>
> Or this... but they don't on my 4channel+spdif card either.
>
> Try arecord -L
> (Capital L)
>
> It still doesn't show number of outputs directly but rather choices, There
> it lists stereo as:
> front:CARD=M66,DEV=0
> M Audio Delta 66, ICE1712 multi
> Front speakers
> and spdif as:
> iec958:CARD=M66,DEV=0
> M Audio Delta 66, ICE1712 multi
> IEC958 (S/PDIF) Digital Audio Output
> To use my 4 analog inputs I would use:
> surround40:CARD=M66,DEV=0
> M Audio Delta 66, ICE1712 multi
> 4.0 Surround output to Front and Rear speakers
> This one here _might_ be my analog inputs plus spdif:
> surround51:CARD=M66,DEV=0
> M Audio Delta 66, ICE1712 multi
> 5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> I say might be because jack actually show 12 inputs:
> 1-4 are analog
> 5-8 are not used but defined for the ice1712
> 9-10 spdif
> 11-12 monitor mixer output
> So the last two inputs in 5.1 might actually be the dead inputs 5-6
>
>
> --
> Len Ovens
> www.OvenWerks.net
>
>

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Received on Tue Nov 13 04:15:03 2012