Re: [LAD] First release of zita-ajbridge

On 03/21/2012 12:54 PM, James Warden wrote:
>
>
> Hi Fons,
>
> I gave it a shot yesterday evening. It was not meant to be a thorough
> test but just a check whether I could just replace alsa_in/out with
> zita_a2j/j2a in my environment:
>
> - Core 2 Duo 2 x 2.4GHz (cpufreq disabled)
>
> - kernel 3.2 from liquorix (debian i686) with thread_irq enabled (but
> no complete preemption patch) - RME HDSP + Multiface II
>
> - jackd2 (latest from svn, before it got moved to github) running in
> sync mode, at 96kHz, buffer size 2 x 256 frames
>
> - zita_a2j running on ALSA loopback (loopback card with only two pcm
> substreams enabled when loaded to the kernel)
>
> My .asoundrc is described in the unofficial ALSA WIKI page about the
> loopback device used as a bridge for non-jack apps. I basically set
> the loopback card h/w and s/w parameters to match my jack setting.
>
> The result is not as good out of the box as with alsa_in. I have a
> wav file which is a 440Hz signal running for 2mn. When I play it
> through mplayer -ao alsa and alsa_in on the other end of the ALSA
> loopback, I get no interruption at all. Your zita_a2j app quickly
> introduces interruptions (dropouts probably) which happen when it
> displays something about synchronization in the terminal. I played
> with the resampling factor but it did not improve anything in terms
> of dropouts. On the other hand, alsa_in was just fine.
>
>
> Not sure whether you can use this at all as a data point, but
> something is not optimally running. I have no time to do more
> thorough tests.

I've been debugging this use-case with Fons over the last 24 hours.
Meanwhile he's at zita-ajbridge 0.2.1 (still unreleased) and it
currently runs [mostly] find as a drop-in replacement for alsa_in/out
[for loopback devices].

There's still some issues to be sorted out though.

robin

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Received on Wed Mar 21 16:15:01 2012