Date: Tue, 01 May 2001 17:09:25 -0400 From: Jason Andresen <jandrese@mitre.org> To: Orion Hodson <hodson@aciri.org> Cc: freebsd-multimedia@freebsd.org, George Uhl <uhl@rattler-f.gsfc.nasa.gov> Subject: Re: " Fwd: RAT problems with aureal vortex1 soundcard " Message-ID: <3AEF2605.10F764DB@mitre.org> References: <3AEEF94F.7594CEF3@mitre.org> <200105011827.f41IRHe32143@mule.aciri.org>
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Orion Hodson wrote: > > Jason Andresen writes: > > I don't think any modern version of VAT support half-duplex > > communication. Apparently the designers thought that everybody would be > > using full duplex sound cards by now. Fortunatly VAT will completely > > refuse to start if you have a half duplex card or driver. > > Jason > > I think you are confusing RAT and VAT. RAT only works with full > duplex cards - I made that (erroneous) design decision when RAT-4 work > started. AFAIK VAT has always supported half-duplex cards > and half-duplex operation with full duplex cards. Work on VAT stopped > around 95-96, so there are no "modern" versions, only maintenance has > gone on since then. > > There was a problem with the freebsd-ports version of VAT misdetecting > full duplex cards as half-duplex, but it still worked > (http://www.FreeBSD.org/cgi/query-pr.cgi?pr=23618). I shall re-check > the freebsd ports version tonight to be sure unless. I seem to remember looking at the code for VAT once and discovering that the half duplex audio was handled by function called HDsomethingortheother. That function consisted of one line IIRC: return 0; At work, I was supposed to get some SB16s working in full duplex with 4.0. Unfortunatly I found out later that full duplex was completely broken in 4.0 and the code we were using was 4.0-kernel specific. :( There might be some systems where the half duplex is working (VAT has several different sound systems that can be selected at compile time) but the voxware-linux system wasn't one of them. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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