Re: [PATCH] Adds dB gain to alsa-driver, alsa-lib.

[Liam Girdwood <liam.girdwood@wolfsonmicro.com>]

On Fri, 2005-12-16 at 15:11 +0100, Jaroslav Kysela wrote:
> On Fri, 16 Dec 2005, Takashi Iwai wrote:
> 
> > The trick is to define "step".  Then min/max can be usually within
> > 8 bits.  I recommend you to take a look at HD-audio specification, for
> > example.
> 
> Just short note: Wouldn't be better to use a RPN expression to describe dB 
> <-> raw conversions like rrdtool uses? Just idea (of course that everybody 
> tells me that it's overkill).
> 

I think it might just be overkill :) as whoever is writing the driver
code will probably just lift the values from the codec data sheet. The
data sheets I've seen typically just specify the dB range and step size.

Liam  



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