Re: double speed (ADAT), and hw params ordering

[Takashi Iwai <tiwai@suse.de>]

At Thu, 18 Jul 2002 14:58:07 -0400,
Paul Davis wrote:
> 
> i've been wondering what to do about setting sample rates in the
> hammerfall and h-dsp drivers. fernando and gary from CCRMA have made
> the excellent suggestion that rather than have the driver pretend that
> all rates are available all the time, as it currently does, that we
> have a control switch to go between regular rates and the "double
> speed" or "bitsplit" rates (64kHz-96kHz) which reduce the channel
> count.  i think this is an excellent idea. you would not be able to
> use the switch while the device was open. when you opened it, you
> would find (for example) a device with 14 channels (12 ADAT plus 2
> SPDIF) at 64-96kHz or 26 channels (24 ADAT+2 SPDIF) at 32-48kHz.
 
i vote for this idea.

> if anyone objects to this model, please let me know. right now, its
> more or less impossible to get access to the higher rates.
> 
> on a related note, although the above suggestion will fix this
> particular problem, it seems that it might be wise to consider adding
> a parameter order information field to the driver API, so that drivers
> can say "you have to set param P first, then param N, then param
> O". the default would obviously be "don't care", but for devices that
> lose certain capabilities when certain parameters are set, it would
> make things very much easier.

agreed that it's good to have such one.
but how to implement this?
from the design of hw_constraint, i don't think it's so easy...


Takashi


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