From owner-freebsd-multimedia Tue May 1 14:10: 4 2001 Delivered-To: freebsd-multimedia@freebsd.org Received: from smtpproxy1.mitre.org (mb-20-100.mitre.org [129.83.20.100]) by hub.freebsd.org (Postfix) with ESMTP id 1C71F37B422 for ; Tue, 1 May 2001 14:09:58 -0700 (PDT) (envelope-from jandrese@mitre.org) Received: from avsrv1.mitre.org (avsrv1.mitre.org [129.83.20.58]) by smtpproxy1.mitre.org (8.9.3/8.9.3) with ESMTP id RAA02734; Tue, 1 May 2001 17:09:43 -0400 (EDT) Received: from MAILHUB1 (mailhub1.mitre.org [129.83.20.31]) by smtpsrv1.mitre.org (8.9.3/8.9.3) with ESMTP id RAA02796; Tue, 1 May 2001 17:09:42 -0400 (EDT) Received: from dhcp-105-164.mitre.org (128.29.105.164) by mailhub1.mitre.org with SMTP id 6360683; Tue, 01 May 2001 17:08:26 -0400 Message-ID: <3AEF2605.10F764DB@mitre.org> Date: Tue, 01 May 2001 17:09:25 -0400 From: Jason Andresen Organization: The MITRE Corporation X-Mailer: Mozilla 4.75 [en]C-20000818M (Windows NT 5.0; U) X-Accept-Language: en MIME-Version: 1.0 To: Orion Hodson Cc: freebsd-multimedia@freebsd.org, George Uhl Subject: Re: " Fwd: RAT problems with aureal vortex1 soundcard " References: <3AEEF94F.7594CEF3@mitre.org> <200105011827.f41IRHe32143@mule.aciri.org> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-multimedia@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org 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