On Fri, 12 Sep 2003, James Courtier-Dutton wrote:
> There is a MAJOR problem with the current alsa mixer.
> How do I set a mixer volume to the 0 db point. I.E. no attenuation, and
> no gain.
> Currently, we might have a value from 0 to 100%. Percent of what?
Percent of the volume range.
> What this value means varies depending on the sound card hardware being
> used.
> I think that this should all be changed to signed values, with a max and
> a min setting. With a value of 0 being equivalent to no-gain,
> no-attenuation. Each alsa-driver would then convert this signed value
> into a value actually written to the hardware register via a lookup table.
Things are not as easy as you like. Using the signed notation for the
volume representation does not sound bad, but on the other side, it's
great to have zero as minimum value as well.
I have plans to extend the mixer interface to pass (and handle) the dB
resolution. But it will be done completely in the user space. The alsa-lib
will analyze information from the driver (hardware components) and then it
will use a predefined expressions for these transformations. I think that
we should not polute the kernel space with these "additional" things.
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project, SuSE Labs
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