On Sun, 7 Dec 2003, Arve Knudsen wrote:
> On Sun, 7 Dec 2003 21:00:13 +0100 (CET), Jaroslav Kysela <[EMAIL PROTECTED]>
> wrote:
>
> > On Sun, 7 Dec 2003, Arve Knudsen wrote:
> >
> >> > We all think in the same way, but there's no simple solution for this
> >> > problem. I prefer to have such configuration information in an
> >> user-space
> >> > database accessed via an alsa-lib API. It's nothing for the kernel
> >> space.
> >>
> >> I dunno, I think Paul's thoughts sound sensible. Its not solved in a
> >> simple
> >> manner, but it was obviously solved somehow with other driver
> >> architectures.
> >
> > With very little success when a complicated hardware is in the machine.
> I can't remember having any real problems with this on Windows, or hearing
> about any such problems from others? There was the problem with Logic Audio
> not coping with Hammerfall's variable numberof channels, but I think other
> applications worked fine.
>
> >> Will this database cope with runtime variables, such as the number of
> >> channels with RME Hammerfall though (dependent on samplerate)?
> >
> > It depends on our goals and what we expect from this information. Can you
> > describe your requirement (for what reason, you need this information?).
>
> I'm one of the developers responsible for the ALSA implementation of a
> cross
> platform audio wrapper called PortAudio (www.portaudio.com), which gathers
> info about available devices during startup. Also, when using this library
> myself, I would like to be able to display a list of devices/channels to
> choose from (I normally use channels 17/18). Anyway, such information is
> seemingly easily obtained with other driver architectures, any reason why
> this shouldnt be available to Linux users (disregarding the implementation
> issue)? Personally I see no reason to inhibit flexibility beyond what we
> see as immediately useful.
It depends on your look.
1) we have "abstract" devices not connected to hw (for example null PCM
device in alsa-lib); they can support any configuration you can imagine
2) which information is valid when some devices/configurations cannot be
used simultaneously?
And I'm sure that I forgot something.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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