From alsa-devel-owner@alsa.jcu.cz  Sun Oct 11 16:07:01 1998
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	Sun, 11 Oct 1998 16:06:21 +0200
Date: Sun, 11 Oct 1998 16:06:21 +0200 (CEST)
From: Jaroslav Kysela <perex@jcu.cz>
To: Matthias Dahl <matthew@nights.dhis.org>
cc: alsa-devel@alsa.jcu.cz
Subject: Re: ALSA and RVPlayer 5.0
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On Sun, 11 Oct 1998, Matthias Dahl wrote:

> ]/ Howdy! \[
> 
> I hope this is the right address to write to, because I haven't found any
> other one in the documentation which fits. :-(
> 
> If I'm wrong here, I'm very sorry, but maybe you can help me. :)
> 
> Now back to the subject. I've upgraded to ALSA from OSS/Lite today.  I am
> very positively suprised, how far this project has already gotten.  It is
> great work and should be integrated into the main Kernel... Keep it up!!!
> 
> (And I could bet, some programs have a better sound quality than before!)
> 
> And back again to the subject. :) Although every program is working fine,
> still there is one player which makes trouble - it's the RealPlayer 5.00.
> It playes the movies, but the sound is very very bumpy.
> 
> It's like...
>               1sec sound          | This repeats until
> 	      a brief clack/stop  | the movie is finished.
> 
> I've tried almost every possible thing with the fragement size option for
> the ALSA OSS-Emu driver, but it made things even worse. Depending on what
> I did, I got bumpy-free sound, which unfortunately stopped  after several
> seconds as well as the RealPlayer itself.
> 
> Is this problem already known? Is there maybe already a patch available??

It is known, no fix and probably it willn't be fixed from me. I spended
very much my time to find where is the problem. It looks for me, that RV
have wrong OSS/Lite driver (Alan Cox - current main maintainer of
OSS/Lite - reports trouble with RV, too). RV setup very small fragments
which is inadequate to used stream format (if I remember correctly it's
128 fragments with 64 byte size). This setup causes high interrupt
activity and underruns are occured in many cases. After some time is
playback stream between driver and RV totaly unsychronized and some bad
things are happen (RV stops or something like this).

I'm sorry, but maybe it's time to write to Real Networks that RV for Linux
have wrong audio driver and if they don't want support better ALSA native
interface. This activity shoudl come from you - RV user.

							Jaroslav

-----
Jaroslav Kysela <perex@jcu.cz>
Academic Computer Centre, University of South Bohemia
Branisovska 31, C. Budejovice, CZ-370 05 Czech Republic


