Re: ALSA / DMIX

["Nicolás Velásquez O." <spidyno@yahoo.es>]

Hello there,

My system:
- Dell, Inspiron 5100
- Debian sarge
- snd_intel8x0
- Self compiled kernel 2.6.7

I've had not so nice experiences (neither dmix nor asym) with it:
- Using xmms, if there is a lot of disk usage, audio will stop playing.
- Using (self compiled) mplayer, the audio won't play well.

Solutions: (better solutions are welcome!!!!!!)
- xmms, use xmms through arts (and arts through alsa)
- MPlayer, give cache to the default alsa device.

Solutions drawbacks:
- xmms, arts ain't that good, some audio files will play lossy.
- MPlayer, none.

Links:
http://alsa.opensrc.org/index.php?page=DmixPlugin
http://alsa.opensrc.org/index.php?page=asym



My /etc/asound.conf:
#asym fun start here. we define one pcm device called "dmixed"
pcm.dmixed {
       type dmix
       ipc_key 1025
       slave {
                pcm "hw:0,0"      # you cannot use a "plug" device
						#here,darn.
                period_time 0
                period_size 1024  # must be power of 2
                buffer_size 8192  # dito. It
                #format "S32_LE"
                #periods 128      # dito.
                #rate 8000        # with rate 8000 you *will* hear,
                                  # if ossmix is used :)
       }
       bindings {
               0 0
               1 1
       }
}

#one called "dsnooped" for capturing
pcm.dsnooped {
        ipc_key 1027
        type dsnoop
        slave.pcm "hw:0,0"
}

#and this is the real magic
pcm.asymed {
        type asym
        playback.pcm "dmixed"
        capture.pcm "dsnooped"
}

#a quick plug plugin for above device to do the converting magic
pcm.pasymed {
        type plug
        slave.pcm "asymed"
}

#a ctl device to keep xmms happy
ctl.pasymed {
        type hw
        card 0
}

#for aoss:
pcm.dsp0 {
        type plug
        slave.pcm "asymed"
}

ctl.mixer0 {
        type hw
        card 0
}

# alsa default card
pcm.!default {
       type plug
       slave.pcm "asymed"
}
#done


El Vie 09 Jul 2004 18:37, Chris Metcalf escribió:
> Has anybody had a good experience getting the Dmix plugin working
> well with ALSA?
>
> I'm trying to get my laptop (Thinkpad X31 using the snd_intel8x0 ALSA
> module) to be able to play more than one wave channel at once, but
> I'm not having much success.
>
> Any helpful direction (howtos, good/bad experiences, alternate
> methods) would be appreciated.
>
> Thanks,
> --
> Chris Metcalf
> chris@chrismetcalf.net
> http://chrismetcalf.net

-- 

Atentamente,
Nicolás Velásquez
Bogotá, Colombia

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