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Re: AC97 and Linrad; works at W3SZ using OSS
- Subject: Re: AC97 and Linrad; works at W3SZ using OSS
- From: "Rein A. Smit" <rein0zn@xxxxxxxxxxxxxxxxx
- Date: Sat, 12 Apr 2003 07:41:13 -0700
Thanks again. I run this through the reflector as I suppose present
or future Linrad users might be interested in this discussion and
the final outcome.
> Hi, Rein!
> Rein A. Smit wrote:
> > Hello Roger,
> > Thanks for reply. I am using the the VIA VT82Cxx driver, it comes with
> > Mandrake.
> > I thought to read into you old DSP page ( 2001 or so ) that you
> > had Linrad running with (1) one card and without OSS. Is that
> > true? I also read in Leif's early notes that he used only
> > one card at the time?
> Yes, on a PPro200 I have Linrad running with just a single soundblaster
> card. You can run things that way. But then your options are limited
> due to the limited number of input/output channels available.
Agreed, but as at this moment I only like to use Linrad as a
audio processor. I hope to use the complete system with
front end and the rest later and then I will use OSS with the
From looking on the net I have to conclude that the AC97
and Linux do not seem to mix very well! Numerous questions
and few answers.
> > Perhaps I am trying to do something that is not possible or
> > has not be done before with Linrad?
> > The AC97 is working OK for playing CD's etc. The problem is to
> > get the DSP processed output from Linrad to get to the
> > AC97 and to disconnect the speaker output from the front end
> > module ( the digitizing part ) I believe that is because I
> > have no good control how to set-up the AC97 ( mixer problem )
> I believe this is an svgalib issue. You need to have an audio driver
> that works for AC97 with svgalib. The OSS driver does this. I suspect
> the drivers you have do not.
You have so much more experience with this than I do but hard for
me to understand that it is related to the graphics. But then
you must have some reason to think that is the case.
> Is there a reason you don't want to use OSS? It seems like so many on
> the reflector don't want to use it. But I believe Leif has recommended
> it, and it has always allowed whatever I am using here to perform with
> svgalib and linrad. While OSS costs a few dollars, the time it saves is
> worth far more than what it costs, at least to me.
> > It is in the instructions where Lief writes to use the mixer
> > ot set-up the audio cared where things are failing ( I think )
> > I wished somebody could tell me that this is nonsense or that
> > it is making sense...
> > I also would like to know the signal flow into the audio card(2)
> > RX audio into "line"?
> > Digitized signal out from card into bus...
> > Linrad DSP processed signal via bus into audio card ...
> > audio signal out on "speaker" or "PCM" ....
> I just feed the data from the hardware into the mic in on the AC97 and
> take the output from the speaker out.
Yes, That is the way it should be I think but it requires that
the card needs to get connected to the right signals ( digital )
> When using two cards, the input goes into the mic in or line in on the
> card used as input, and the output comes from the speaker out on the
> card used as output. The computer and linrad take care of sorting out
> the signals in between. I use the OSS program ossmix to set up the
> parameters correctly. Then, when running Linrad, I select the proper
> device for input and output in the A/D setup screens.
> I didn't have to do any fiddling with 'speaker' 'PCM' or other settings
> with any of the OSS drivers.
> I hope that helps.
> > 73 Rein
> > w3sz wrote:
> >>Hi, Rein!
> >>WIth my latest computer brought online I am using the onboard audio
> >>which I believe is the same as the AC 97 you refer to, and things work
> >>fine with svgalib and linrad.
> >>This machine is a homebrew P3 using a SOYO motherboard @ 1.0 GHz, RHL
> >>8.0, Delta44 input and motherboard VIA97 audio output. The audio didn't
> >>work with svgalib and the RHL audio drivers, so I use the OSS drivers.
> >>The OSS driver for the onboard sound is 'VIA VT82C686 AC97 audio'. I
> >>had to pay an extra $15 for it. After my web purchase of the addon, they
> >>just emailed me a new license file.
> >>OSS and run Linrad without identified problems.
> >>I don't know if this information will be of help to you or not, but I
> >>hope it is of some help.
> >>Please note that there may be an antispam preamble to the "replyto"
> >>address. IF so, remove it to reply directly to this message. Thank you!
> >>Roger Rehr
> >>2 Merrymount Road
> >>Reading, PA 19609
> Please note that there may be an antispam preamble to the "replyto"
> address. IF so, remove it to reply directly to this message. Thank you!
> Roger Rehr
> 2 Merrymount Road
> Reading, PA 19609