* Takashi Iwai ([EMAIL PROTECTED]) wrote:
> At Fri, 31 Oct 2003 12:39:18 -0500,
> Marcel wrote:
> >
> > * Takashi Iwai ([EMAIL PROTECTED]) wrote:
> > > At Thu, 30 Oct 2003 12:42:39 -0500,
> > > Marcel wrote:
> > > >
> > > >
> > > > I've been trying to finetune my cmipci for several weeks now. And this is
> > > > the best way I've been able to get transparent operation with various audio
> > > > material: stereo, mono, 4.0, 5.1. The main problem being no surround sound
> > > > iif "Exchange DAC" setting was not set, and sound on the rear speakers only
> > > > if it was.
> > >
> > > ah, this might be true.
> > > does it happen both on 4.0 and 5.1 outputs?
> > > i don't remember that it's necessary for 5.1 at the last time i
> > > tested.
> >
> > With surround40 plugin, 4 speakers, yes it's needed for both 4.0 and 5.1
> > material. Applications such as mplayer or xine will remix 5.1 material to
> > 4 channels. For 6 speakers systems, I really don't know.
>
> could you try surround51 and check whether it somehow works?
I tried. It's ok with stereo material. With 5.1 material, xine refuses to
use it because I have 4 speakers only. Mplayer will use it but 2 channels
only. Seems there is no way to force applications to use 6 channels when I
got only 4 speakers. "Mplayer -ao alsa9:surround51 -channels 6" gives an
error. And I don't have any 5.1 sound file in wav or mp3 format for aplay
or alsaplayer to try. Never been able to locate some. But I suspect it
will fail too. I think you'll need someone with 6 physical speakers to have
this verified.
>
> > > perhaps we should simply remove this control from user and handle
> > > internally for the MC6 chip.
> > >
> >
> > I agree. Its usage is confusing and may results in improper operation
>
> how about the attached patch?
Great job! If I understand how it works, the mixer setting is gone for the
8738-MC[46] chipsets, and still there for plain 8[37]38. Works very well
here, no more confusion. Multi-channel sound is enabled automatically.
Front material is always in front, and surround material always in rear.
Adjustment is unconventional, but straightforward for surround material:
1 - Master at 0.
2 - Adjust rear volume with PCM near maximum required.
3 - Increase front volume with Master to obtain rear-front balance.
4 - Decrease PCM to lower volume on all 4 speakers.
Unusual, but that's the way its operates.
Don't forget to remove the following block in alsa/cards/CMI8738-MC6.conf if
you added it in the CVS, otherwise you'll get errors when using surround40
as "Exchange DAC" is no more:
# {
# name "Exchange DAC"
# lock true
# preserve true
# value true
# }
May I suggest adding this patch to the CVS?
One more control that deserves to go in mixer: "3D Control Switch". It
doesn't work, never did, does nothing at all.
-------------------------------------------------------
This SF.net email is sponsored by: SF.net Giveback Program.
Does SourceForge.net help you be more productive? Does it
help you create better code? SHARE THE LOVE, and help us help
YOU! Click Here: http://sourceforge.net/donate/
_______________________________________________
Alsa-devel mailing list
[EMAIL PROTECTED]
https://lists.sourceforge.net/lists/listinfo/alsa-devel
