13 Feb
2005
13 Feb
'05
2:50 p.m.
Thanks, Thomas.
Nice script--as it also explains the parameter relationships nicely.
thomas charbonnel writes:
Janina Sajka wrote :
--
Janina Sajka Phone: +1.202.494.7040
Partner, Capital Accessibility LLC http://www.CapitalAccessibility.Com
Chair, Accessibility Workgroup Free Standards Group (FSG)
janina(a)freestandards.org http://a11y.org
If Linux can't solve your computing problem, you need a different problem.
Something about amixer's control of the HDSP
Multiface has changed. And,
I can't seem to hack how to fix things. Please help!
I used to use the simple bash script (as published in Linux Journal)
#!/bin/bash
for i in $(seq 1 18);do
amixer cset name=Chn,index=$i 32768
done
to set all the channels to unity, but this script no longer works. I
get:
amixer: Control default cinfo error: No such file or directory
Meanwhile, my hdsp is definitely clipping and I can't quite tell where
to tweak it.
alsamixer is also no longer available, gives an error:
No mixer elems found
This is with Fedora 3, so alsa 1.0.6 and the alsa-firmware tools
(hdsploader, hdspconfig, hdspmixer).
PS: hdspmixer is not accessible to me because I need an eyes-free
interface.
I suppose knowing where/how to tweak the hdspmixer default presets might
do it??
Thanks for any help.
Janina
Hi Janina,
You have to use the 'Mixer' ctl with amixer (numid=5).
It takes three parameters: source, destination, and gain
source: 0-25 -> the physical inputs
(on the multiface only 0-17)
26-51 -> the playbacks (software output)
(only 26-43 on the mf)
destination: 0-25 -> physical outputs (mf: 0-17)
26-27 -> line out (phone)
gain: 0-65536 -> 0 is minus infinity, 32768 is 0 dB, 65535 is + 6dB
You can use the following script, equivalent to the 1st hdspmixer
preset :
#! /bin/bash
for out_left in $(seq 0 2 25);
do
let out_right=$out_left+1
let in_left=$out_left+26
let in_right=$out_right+26
amixer cset numid=5 $in_left,$out_left,32768
amixer cset numid=5 $in_left,26,16384
amixer cset numid=5 $in_right,$out_right,32768
amixer cset numid=5 $in_right,27,16384;
done;
Thomas