Re: Single process freeze when opening capture device

[Abramo Bagnara <abramo.bagnara@libero.it>]

Jaroslav Kysela ha scritto:
> On Thu, 29 May 2003, Abramo Bagnara wrote:
> 
> 
>>What about a "dir" field in common section of pcm configuration?
>>
>>   dir STR	# PCM allowed directions "playback", "capture", "both" (default)
> 
> 
> I'd like to solve the problem with same names, but different 
> configurations for streams.
> 
> I have an idea like:
> 
> pcm.name {
> 	... global configuration ...
> 	playback {
> 		... playback configuration ...
> 	}
> 	capture {
> 		... capture configuration ...
> 	}
> }

I'm far from convinced that to have same name for different things is a 
good idea, and in this case I'd propose to have:

pcmc.name {
}

pcmp.name {
}

then specifying different namespaces for different things.

This also permits to leave current
pcm.name {
}

unmodified (although with lower priority wrt pcmc and pcmp).

> 
> Also, we have copy of configuration for each open which is used for 
> run-time evaluation. I think that we may pass from the open code some more 
> information and use some {} region as data caching:
> 
> private {	# reserved for internal data only, warn and ignore if user defines it
> 	direction playback
> 	ctl_cache_handle 0x%p		# cache ctl handle for runtime evaluation
> 	... etc, etc ...
> }
> 
> We may add condition (if - else) evaluation functions to runtime parsing 
> which can test the contents of private variables. Now, we have same driver 
> with different chip revisions which add/remove some features (mainly 
> controls) and we need to test them to behave correctly.
> 
> Also, the first proposal requires to change all plugins, the later will 
> rewrite the configuration at run-time, so no changes are required for 
> plugins.

I've reread many times this last part but I'm unable to understand 
what's your idea. Can you rephrase?

-- 
Abramo Bagnara                       mailto:abramo.bagnara@libero.it

Opera Unica                          Phone: +39.546.656023
Via Emilia Interna, 140
48014 Castel Bolognese (RA) - Italy



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