USB Audio - assertion

USB Audio - assertion

[tapio laxström]

Hi!

Seems like USB Audio driver doesn't want to be on /dev/mixer0 ;)
(ecasound thru /dev/dsp0 works fine but xmms, which wants to use mixer, 
fails).

I didn't check the code; is it just buggy assertion or something else?

Current cvs version seems to work fine with my Emagic EMI 2|6 (on 
/dev/dsp1).

---clip---
[root@zappa asound]# insmod snd-usb-audio ; insmod snd-maestro3
Using /lib/modules/2.4.19-pre8/kernel/sound/usb/snd-usb-audio.o
Using /lib/modules/2.4.19-pre8/kernel/sound/pci/snd-maestro3.o
[root@zappa asound]# cat cards
0 [card0          ]: USB-Audio - USB Audio Driver
                      EMAGIC GmbH Emagic EMI 2|6
1 [card1          ]: Allegro - ESS Allegro PCI
                      ESS Allegro PCI at 0x1400, irq 5
[root@zappa asound]# xmms
xmms: simple.c:1376: snd_mixer_selem_get_playback_volume: Assertion 
`(unsigned int) channel < s->str[0].channels' failed.
Aborted
[root@zappa asound]# rmmod snd-usb-audio ; rmmod snd-maestro3
[root@zappa asound]# insmod snd-maestro3 ; insmod snd-usb-audio
Using /lib/modules/2.4.19-pre8/kernel/sound/pci/snd-maestro3.o
Using /lib/modules/2.4.19-pre8/kernel/sound/usb/snd-usb-audio.o
[root@zappa asound]# xmms
[root@zappa asound]# cat cards
0 [card0          ]: Allegro - ESS Allegro PCI
                      ESS Allegro PCI at 0x1400, irq 5
1 [card1          ]: USB-Audio - USB Audio Driver
                      EMAGIC GmbH Emagic EMI 2|6


--
best regards
--
tapio laxström



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Re: USB Audio - assertion

[Patrick Shirkey]

tapio laxström wrote:
> Hi!
> 
> Seems like USB Audio driver doesn't want to be on /dev/mixer0 ;)

Possibly your card doesn't have mixer properties. The quattro doesn't. I 
don't know exactly how to get round that with xmms though. You could try 
the native alsa plugin available from their site.


> (ecasound thru /dev/dsp0 works fine but xmms, which wants to use mixer, 
> fails).
> 
> I didn't check the code; is it just buggy assertion or something else?
> 
> Current cvs version seems to work fine with my Emagic EMI 2|6 (on 
> /dev/dsp1).
> 
> ---clip---
> [root@zappa asound]# insmod snd-usb-audio ; insmod snd-maestro3
> Using /lib/modules/2.4.19-pre8/kernel/sound/usb/snd-usb-audio.o
> Using /lib/modules/2.4.19-pre8/kernel/sound/pci/snd-maestro3.o
> [root@zappa asound]# cat cards
> 0 [card0          ]: USB-Audio - USB Audio Driver
>                      EMAGIC GmbH Emagic EMI 2|6
> 1 [card1          ]: Allegro - ESS Allegro PCI
>                      ESS Allegro PCI at 0x1400, irq 5
> [root@zappa asound]# xmms
> xmms: simple.c:1376: snd_mixer_selem_get_playback_volume: Assertion 
> `(unsigned int) channel < s->str[0].channels' failed.
> Aborted
> [root@zappa asound]# rmmod snd-usb-audio ; rmmod snd-maestro3
> [root@zappa asound]# insmod snd-maestro3 ; insmod snd-usb-audio
> Using /lib/modules/2.4.19-pre8/kernel/sound/pci/snd-maestro3.o
> Using /lib/modules/2.4.19-pre8/kernel/sound/usb/snd-usb-audio.o
> [root@zappa asound]# xmms
> [root@zappa asound]# cat cards
> 0 [card0          ]: Allegro - ESS Allegro PCI
>                      ESS Allegro PCI at 0x1400, irq 5
> 1 [card1          ]: USB-Audio - USB Audio Driver
>                      EMAGIC GmbH Emagic EMI 2|6
> 
> 
> -- 
> best regards
> -- 
> tapio laxström
> 
> 
> 
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> 



-- 
Patrick Shirkey - Boost Hardware Ltd.
For the discerning hardware connoisseur
Http://www.boosthardware.com
Http://www.boosthardware.com/LAU/guide/
========================================



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Re: USB Audio - assertion

[Takashi Iwai]

At Fri, 05 Jul 2002 23:24:06 +0900,
Patrick Shirkey wrote:
> 
> tapio laxström wrote:
> > Hi!
> > 
> > Seems like USB Audio driver doesn't want to be on /dev/mixer0 ;)
> 
> Possibly your card doesn't have mixer properties. The quattro doesn't. I 
> don't know exactly how to get round that with xmms though. You could try 
> the native alsa plugin available from their site.

emi2|6 should have mixer controls but likely they are named in a
different manner from the conventional cards.
please note that usbaudio driver creates the mixer elements
automatically by parsing the topology, hence the naming might not be
perfect.

anyway, i also recommend to use alsa output plugin.


Takashi


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