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Normie
Tux's lil' helper
Joined: 03 Jul 2002
Posts: 83
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 Posted: Sat Nov 30, 2002 7:03 pm Post subject: ALSA: Sound from more than one app at the same time? |
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Basically, I want to play a game on zsnes with music coming from xmms, but neither can run if the other is running, sound disabled or otherwise. Any ideas?
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Malakin
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Joined: 14 Apr 2002
Posts: 1692
Location: Victoria BC Canada
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| Posted: Sat Nov 30, 2002 11:59 pm Post subject: |
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There should definitely be an faq for the whole sound issue.
Alsa only supports hardware mixing with certain cards. You can look at the list here (http://www.alsa-project.org/alsa-doc/) and the ones with a (4) beside them support this.
2.4 kernel sound support doesn't support sound mixing at all.
If your sound card doesn't support hardware mixing then you need a software mixer like arts or esound.
If you need software mixer support then set the audio output on all your programs to use arts (or whatever mixer you choose).
If your program doesn't support arts then you can start it like this instead "artsdsp program" with program being the name of the program, this forces sound output to go through arts. |
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Herodot
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Joined: 29 Jul 2002
Posts: 429
Location: Professor Xavier's school for gifted youngsters
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| Posted: Sun Dec 01, 2002 4:24 am Post subject: |
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Hi,
| Quote: | | here should definitely be an faq for the whole sound issue. |
Well, there's a HOWTO. But it's very simple, and I really agree with you.
| Quote: | | 2.4 kernel sound support doesn't support sound mixing at all. |
Please explain. This is only with compiled OSS stuff, right?
| Quote: | | If your program doesn't support arts then you can start it like this instead "artsdsp program" with program being the name of the program, this forces sound output to go through arts. |
I just asked about this in another thread - where were you? It's a great little trick, but unfortunately it doesn't work when I try to do | Code: | | artsdsp java playwav something.wav |
I get one of those "mcop warning: user defined signal handler found for SIG_PIPE, overriding"
Still, thank you for a couple of insightful comments.
Herodot |
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void
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Joined: 24 Jun 2002
Posts: 42
Location: Sweden
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| Posted: Sun Dec 01, 2002 9:05 am Post subject: |
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Newer versions of alsa suports multiple outputs with cs46xx (common chip). Compiling the cvs version or (at least I think) the newest release will fix this.
Oh, you have to add mmap=1 to your module-options for your soundcard (it was a thread about this). |
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Malakin
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Joined: 14 Apr 2002
Posts: 1692
Location: Victoria BC Canada
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| Posted: Sun Dec 01, 2002 11:53 pm Post subject: |
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| Quote: | | Please explain. This is only with compiled OSS stuff, right? |
Yes, no mixing with OSS. What I meant was 2.5x+ kernel sound is now Alsa by default.
| Quote: | | I get one of those "mcop warning: user defined signal handler found for SIG_PIPE, overriding" |
artsdsp doesn't work for everything, you can try void's suggestion. |
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Normie
Tux's lil' helper
Joined: 03 Jul 2002
Posts: 83
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| Posted: Mon Dec 02, 2002 6:58 pm Post subject: |
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I use the via686 module, since that's the only one that works with my computer in alsa. The kernel support works, but the tone of the sounds in a large number of programs is a few notes too high, oddly enough, so I have to use alsa.
I can't find an mmap option of any sort anywhere, which, needless to say, is bad for my sound-mixing needs (not to mention my quake3 needs).
Any advice?
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Malakin
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Joined: 14 Apr 2002
Posts: 1692
Location: Victoria BC Canada
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| Posted: Mon Dec 02, 2002 10:34 pm Post subject: |
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| Quote: | | I can't find an mmap option of any sort anywhere |
artsdsp --mmap
(Or just artsdsp -m)
When you load the Alsa modules you should be loading all these:
snd-via686
snd-pcm-oss
snd-mixer-oss |
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Lin_Matt
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Joined: 23 Jun 2002
Posts: 581
Location: TechWasteland (Mississippi)
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| Posted: Mon Dec 02, 2002 10:39 pm Post subject: |
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Along the same lines...
Does anyone know of a way to route a particular app's sound thru one of the mixer controls so it could be mixed with sound from another app? I would really love to be able to control xine's volume via the video mixer control... |
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Bar
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Joined: 21 Jun 2003
Posts: 73
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| Posted: Fri Jul 04, 2003 3:43 am Post subject: |
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| cant speak for xine, but xmms's volume control changes the psd value in alsamixer, so if there is a psd value in your mixer thats probably it |
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RoVeRken
Tux's lil' helper
Joined: 22 May 2003
Posts: 93
Location: Belgium (Leuven)
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| Posted: Fri Jul 04, 2003 3:54 pm Post subject: |
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AH, i have this problem too ;p gonne try it out today ... thx
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Woody
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Joined: 30 Nov 2002
Posts: 592
Location: Milwaukee
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| Posted: Sat Jul 05, 2003 8:10 am Post subject: |
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| Malakin wrote: |
Alsa only supports hardware mixing with certain cards. You can look at the list here (http://www.alsa-project.org/alsa-doc/) and the ones with a (4) beside them support this.
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Well the (4) means the card supports hardware mixing. The real question is
can alsa do software mixing? the answer is supposed to be yes (via the dmix
plugin) but I've yet to see (hear?) it work without massive xruns. |
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