dmix and full-duplex

dmix and full-duplex

[David Lloyd]

After much frustration being stuck on intel8x0 and trying to run teamspeak 
at the same time as a game, I was looking at the dmix implementation and I 
had several questions.

What I want to do is modify dmix to do one of these things, in order of 
increasing desirability:

1) When capture stream is opened, let the open succeed, and all audio read 
from the capture stream is 0 (like the null plugin I guess).

2) Allow one client to open capture stream and just pipe data from the 
slave to the client (no multiplexing of any kind).

3) Combine dmix and dsnoop into a full-duplex sharing plugin.  This seems 
like the ideal setup to me.

The current implementation seems to me to handle capture stream in the 
worst possible way.  When I open TeamSpeak and a game with sound with 
dmix, TeamSpeak wont even open the sound device for playback because 
capture returns an error.

The thing is, dmix seems to have been around for years and nobody has 
addressed the shared full duplex issue, although it is talked about from 
time to time.

So I will make a deal... if you all give me support and help with my
questions, I'll tackle the problem myself, probably in the order I've
liested above. :)

Otherwise, if you all think this is not a worthwhile avenue to pursue, I 
will try to convince my wife to let me buy a sblive and call it a day. :)

- D


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Re: dmix and full-duplex

[Peter Kirk]

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Hash: SHA1

Am Mittwoch, 17. Dezember 2003 21:11 schrieb David Lloyd:
> After much frustration being stuck on intel8x0 and trying to run teamspeak
> at the same time as a game, I was looking at the dmix implementation and I
> had several questions.

> So I will make a deal... if you all give me support and help with my
> questions, I'll tackle the problem myself, probably in the order I've
> liested above. :)
>
> Otherwise, if you all think this is not a worthwhile avenue to pursue, I
> will try to convince my wife to let me buy a sblive and call it a day. :)
Well,

its a very worth while avenue - in my personal and biased opinion (as being
heavily involved with teamspeak and its linux problems). You might want to
read the lengthy thread I created by asking for smart dmix and dsnooping -
Title is "smart and automatic use of dmix and dsnoop - feature suggestion."

Good luck
Peter
- --
"The only way I can lose this election is if I'm caught in bed with a dead
girl or a live boy."
- -- Louisiana governor Edwin Edwards
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Re: dmix and full-duplex

[David Lloyd]

On Wed, 17 Dec 2003, Peter Kirk wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> Am Mittwoch, 17. Dezember 2003 21:11 schrieb David Lloyd:
> > Otherwise, if you all think this is not a worthwhile avenue to pursue, I
> > will try to convince my wife to let me buy a sblive and call it a day. :)
> 
> its a very worth while avenue - in my personal and biased opinion (as
> being heavily involved with teamspeak and its linux problems). You might
> want to read the lengthy thread I created by asking for smart dmix and
> dsnooping - Title is "smart and automatic use of dmix and dsnoop -
> feature suggestion."

I read the thread, it was very informative.  Actually that thread was 
pretty much my initial reference for learing how dmix works. :)  But it 
didn't directly address the full-duplex software issue, mostly it talked 
about using cards with hardware mixing.  I'm hoping to address the issue 
directly, and beat it to a bloody conclusion in time for a clan match!  
Now *that* is coding under pressure :)

- D


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Re: dmix and full-duplex

[Frank Barknecht]

Hallo,
David Lloyd hat gesagt: // David Lloyd wrote:

> The thing is, dmix seems to have been around for years 

dmix is not around for years. It came to live more or less this year,
and was only fully functional for some cards with version 0.9.7 or .8.

Another thing is, that while dmix works very well with correctly
written ALSA applications, OSS applications still aren't fully
supported (some maybe never will, all require hacks).

Nevertheless dmix is rather well explored now, but dsnoop would profit
a lot from a page like that: http://alsa.opensrc.org/?DmixPlugin

So it would be wonderful if you could find more real-world experiences
about dsnoop and then would document it for others to use, too.

(I can't speak for Teamspeak, I don't know it, I play on my GBA.)

ciao
-- 
 Frank Barknecht                               _ ______footils.org__


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