Re: trouble with constraint rules - Line6 TonePort UX1 USB driver

[Takashi Iwai <tiwai@suse.de>]

At Sat, 13 May 2006 12:46:19 +0300,
Stefano D Angelo wrote:
> 
> Hi,
> I'm having troubles setting hardware constraint rules. What I need to do is
> setting the period size once I know the rate requested by the application.
> The settings are these: 44100 Hz <-> 45 * 2 frames per period, 48000 Hz <-> 48
> * 2 frames per period.

This won't work as expected, unfortunately.

The ALSA configuration selection is basically a narrowing of the
configuration space.  A constraint can reduce the space, e.g. from a
range [0,100] to [50,80].  But it can't move the range from [10,20] to
[30,40].

In that case, I'd implement two different PCMs for both rates.
Or, just start with 48k then extend to other rates.


Takashi


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