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 ...
}
}
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.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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