If we have a DB of info how would we define the abilities of each device?
I assume this info is available in the driver layer because there is a point where ALSA will return false eg. if a card is not able to run at 48000Hz
My opinion is that a simple function could be included in alsactl which scans for available devices, makes a list of their abilities. Everyone uses "post-insert alsactl restore" in the modules.conf file so it would be essentially a non issue from a user perspective.
Couldn't this be saved in the config settings for alsactl?
This whole database thing seems like overkill to me, to be honest. This is dynamic information would best be obtained from cards during operation, the only problem is that you have to lock the device. A better design would be to, if possible, allow the configuration space to be read even when a device is streaming.
I dont know the dirty details of writing drivers, but would this be a problem? Perhaps we could differ between read-locked and write-locked configuration, so there would be inclusive read access to the device, and totally exclusive access if it is to be modified.
Hope some of this makes sense
Arve Knudsen
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