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grinch
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Joined: 30 Jan 2003
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PostPosted: Tue Dec 16, 2003 4:34 pm    Post subject: Full Duplex ALSA? Reply with quote

Why is it that I can only get one sound imput at a time with ALSA? For example if I'm using beep-media-player (OSS Output Plugin) and gaim (aplay command to play sounds) then only one can play at a time... and oddly enough all the gaim sounds que up and play after I stop playing music with beep.

edit:
I use:
gnome 2.4
linux-2.6-test11-love1
CMedia Internal soundcard (Gnome ALSA Mixer lists it as CMedia PCI)
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scoon
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PostPosted: Tue Dec 16, 2003 5:10 pm    Post subject: Re: Full Duplex ALSA? Reply with quote

grinch wrote:
Why is it that I can only get one sound imput at a time with ALSA? For example if I'm using beep-media-player (OSS Output Plugin) and gaim (aplay command to play sounds) then only one can play at a time... and oddly enough all the gaim sounds que up and play after I stop playing music with beep.

edit:
I use:
gnome 2.4
linux-2.6-test11-love1
CMedia Internal soundcard (Gnome ALSA Mixer lists it as CMedia PCI)


I don't know anything about that chip, but I would check and see if it has hardware mixing, if not you will need to set up dmix (an alsa feature) to do software mixing.
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blueworm
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PostPosted: Tue Dec 16, 2003 7:24 pm    Post subject: Reply with quote

Only the soundcards(drivers) marked witha (4) support hardware mixing
http://www.alsa-project.org/alsa-doc/index.php3?vendor=All#matrix
full-duplex is the ability to record and play at the same time.
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grinch
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PostPosted: Tue Dec 16, 2003 8:33 pm    Post subject: Reply with quote

hmm, guess its not supported. That means I'll have to get my SBLive! working instead.
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grinch
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PostPosted: Tue Dec 16, 2003 8:43 pm    Post subject: Reply with quote

hey cool, I turned off the CMedia device in BIOS and my SBLive! works now with mixing.
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lbrtuk
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PostPosted: Wed Dec 17, 2003 1:34 am    Post subject: Reply with quote

Just fyi, duplex is when you can read from the soundcard and write to it at the same time, ie- you can be recording from a microphone and playing music at the same time*.

What you're talking about is mixing.

* - silly example. In real life the applications for this are far more useful/exciting. Think realtime audio processing.
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OpelBlitz
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PostPosted: Thu Dec 18, 2003 11:26 pm    Post subject: Reply with quote

So, is mixing supported in 0.9.8 drivers?

Never mind, My i8x0 sound doesn't. Stupid laptop :)
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