[linux-audio-user] HDSP & amixer: What's Changed?
janina at rednote.net
Sun Feb 13 13:49:59 EST 2005
Nice script--as it also explains the parameter relationships nicely.
thomas charbonnel writes:
> Janina Sajka wrote :
> > 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 $(seq 0 2 25);
> let out_right=$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;
Janina Sajka Phone: +1.202.494.7040
Partner, Capital Accessibility LLC http://www.CapitalAccessibility.Com
Chair, Accessibility Workgroup Free Standards Group (FSG)
janina at freestandards.org http://a11y.org
If Linux can't solve your computing problem, you need a different problem.
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