Re: [Jack-Devel] Problems with audioadapter used with capture only interface

On Sun, Dec 29, 2013 at 7:56 PM, Jeremy Jongepier <[hidden]> wrote:
> On 12/29/2013 11:43 AM, Wojciech Zabolotny wrote:
>> What worked for me, was (in three different consoles of the embedded system):
>> # jackd -r -dnet -i -C0 -P1
>> # alsa_in -d hw:0,1 -r48000 -p256 -n3
>> # jack_connect alsa_in:capture_1 system:playback_1
>> however then I had some problems with xruns/latency
>>
>> Is such solution acceptable as a substitute of not working audioadapter?
>> Can I expect that with fixed audioadapter I should be able to reach lower
>> latency and less risk of xrun?
>
> Hello Wojciech,
>
> Afaik the net backend doesn't have -C and -P options, also -i needs an
> integer as a value. So the first command should throw out an error.

Hello Jeremy,

OK. In fact the "-i" option is ignored. so -C0 and -P1 are interpreted
by the jackd
itself.
If I start "jackd -R -dnet -i -C0 -P1" (or "jackd -R -dnet -C0 -P1")
on the embedded system,
I get the following ports on the DAW PC:

$ jack_lsp
system:capture_1
system:capture_2
system:playback_1
system:playback_2
system:playback_3
system:playback_4
buildroot:from_slave_1

if I start simply "jackd -R -dnet", i get :
$ jack_lsp
system:capture_1
system:capture_2
system:playback_1
system:playback_2
system:playback_3
system:playback_4
buildroot:to_slave_1
buildroot:to_slave_2
buildroot:from_slave_1
buildroot:from_slave_2
buildroot:from_slave_3
buildroot:from_slave_4


> And it seems like you're trying to run JACK as root and with the -r option
> while you probably want to use JACK with -R (which is also the default).

Yes, you are right. I've mistaken copying that from the console.

> Using alsa_in increases the change of xruns and it also increases
> latency. And in your first mail you said that you were dealing with a
> capture only interface which makes me wonder where the system:playback_1
> JACK port comes from. Could you provide some more information on your
> setup? What's in /proc/asound/cards?

As I start jack with the "net" backend, the port which is used to
connect to the master
is the "playback port". I need to connect the capture port associated
with my soundcard
(which is added by the alsa_in or by audio_adapter) this port to
transmit my audio.

Regards,
Wojtek

> Best,
>
> Jeremy
>
>
> 
> Jack-Devel mailing list
> [hidden]
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>



-- 
Wojciech M. Zabołotny
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