11 Apr
2009
11 Apr
'09
10:17 p.m.
On Sunday 12 April 2009 01:10:09 you wrote:
Andrew,
How to deal with the mixer (output channels) via CLI?
amixer.
Flo
Florian,
Yes, I see amixer must be used. The proble is, hdsp driver maps card's mixer
controls to alsa mixer controls in not-obvious way.There was somewhere some
information about accessing hdsp mixer controls (how to relate channels and
appropriate controls, write (and read?) values and such), but I can not found
it now (probably it was at old alsa site).
The card has
numid=5,iface=HWDEP,name='Mixer'
control, and, probably, something like
amixer cset numid=5 x,y,z
must be used. What are those x, y, z? :-)
OTOH, it seems like I can not get current hdsp mixer settings: 'amixer cget
numid=5' just returns a tuple with three zero rather full 3dim matrix. Can I?
Has anybody elaborated information about all these issues?
Andrew
-------------------------------------------------------
To have some reserve in volume I set amplifier's
volume regulator
higher than, say, is needed at current moment. As a result I have
software level noticeably below 100%. I suppose such software volume
regulating eats samples resolution (and, at least theoretically,
sometimes I have, say, 12-13 bits rather 16).
If you use the hdsp's matrix mixer, it will render the volume with
higher precision than 16 bits, so play back unattenuated and control
the output level in the matrix mixer.