Alsa fails to open plug:surround51

Alsa fails to open plug:surround51

[Karsten Jeppesen]

Xine will open default to play the dvd menu (2.0).
Then it will issue a snd_pcm_close for that stream

When it then tries to open plug:surround51 (for the movie)  then this 
call fails with resource busy.
What could be the reason?


Karsten



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Re: Alsa fails to open plug:surround51

[Clemens Ladisch]

Karsten Jeppesen wrote:
> Xine will open default to play the dvd menu (2.0).
> Then it will issue a snd_pcm_close for that stream
>
> When it then tries to open plug:surround51 (for the movie)  then this
> call fails with resource busy.

Which sound card?

Could you check with strace whether the device (/dev/snd/pcmCxDyp)
really is closed?


Regards,
Clemens



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Re: Alsa fails to open plug:surround51

[Takashi Iwai]

At Fri, 24 Jun 2005 09:11:35 +0200 (METDST),
Clemens Ladisch wrote:
> 
> Karsten Jeppesen wrote:
> > Xine will open default to play the dvd menu (2.0).
> > Then it will issue a snd_pcm_close for that stream
> >
> > When it then tries to open plug:surround51 (for the movie)  then this
> > call fails with resource busy.
> 
> Which sound card?
> 
> Could you check with strace whether the device (/dev/snd/pcmCxDyp)
> really is closed?

A known problem with dmix.  It's a race between the dmix server
process and reopening process.

A workaround would be to take a short sleep (or polling of resource
release) at closing a dmix stream...  But anyway it's tricky.


Takashi


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Re: Alsa fails to open plug:surround51

[Karsten Jeppesen]

Takashi Iwai wrote:

>At Fri, 24 Jun 2005 09:11:35 +0200 (METDST),
>Clemens Ladisch wrote:
>  
>
>>Karsten Jeppesen wrote:
>>    
>>
>>>Xine will open default to play the dvd menu (2.0).
>>>Then it will issue a snd_pcm_close for that stream
>>>
>>>When it then tries to open plug:surround51 (for the movie)  then this
>>>call fails with resource busy.
>>>      
>>>
>>Which sound card?
>>
>>Could you check with strace whether the device (/dev/snd/pcmCxDyp)
>>really is closed?
>>    
>>
>
>A known problem with dmix.  It's a race between the dmix server
>process and reopening process.
>
>A workaround would be to take a short sleep (or polling of resource
>release) at closing a dmix stream...  But anyway it's tricky.
>  
>
What I ended up doing in Xine is just that. Sleeping a second and then 
try again.
Thanks both of you.  (Soundcard is an ALC650 builtin on an ABIT NF7-S, 
using analog outputs)

Karsten



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