Date: Thu, 04 Apr 2002 11:55:53 -0800 From: Lars Eggert <larse@ISI.EDU> To: The Anarcat <anarcat@anarcat.dyndns.org> Cc: John Utz <john@utzweb.net>, multimedia@FreeBSD.ORG Subject: Re: Soundblaster Live rear channels? Message-ID: <3CACAFC9.3060908@isi.edu> References: <3CAC8E70.3040700@isi.edu> <Pine.LNX.4.44.0204041147440.2292-100000@jupiter.linuxengine.net> <20020404193214.GD279@lenny.anarcat.dyndns.org> <3CACAC92.3040506@isi.edu> <20020404194937.GE279@lenny.anarcat.dyndns.org>
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[-- Attachment #1 --] The Anarcat wrote: >> My understanding was that "virtual" channels act like virtual sound >> cards, i.e. each applications gets what looks like a separate >> sound device, and the kernel muxes the output. I'm not sure this >> has anything to do with the mixer channels, which is where I would >> expect the rear channel to show up. > > > And this is why I brought up the "mapping" issue. I think pcm can use > the multiple channels available (front and rear) through the virtual > channels technique. > > The kernel can mux the input from various apps into a single sound channel, > so it's likely that it can do the opposite: mux a single sound input > to multiple channels. > > I can't answer wether it is the case, but it's likely to be. It's not as simple as that. There's harware on the card that processes stereo input (from apps) and creates four separate signals for surround sound. (Otherwise you could simply hook up the rear speaker pair in parallel to the front one, using the same output signals.) Lars -- Lars Eggert <larse@isi.edu> Information Sciences Institute http://www.isi.edu/larse/ University of Southern California [-- Attachment #2 --] 0 *H 01 0 + 0 *H 00 G0 *H 01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.300 010824164000Z 020824164000Z0T10 UEggert1 0 U*Lars10U Lars Eggert1 0 *H larse@isi.edu00 *H 0 |\Pw v~~ FDooӦA\- Cˀ4.)&{肋 ,z (ܷر߈T7_'txGH^tt/ҹB8%t<#ֲN V0T0*+e!0 00L2uMyffBNUbNJJcdZ2s0U 0 larse@isi.edu0 U 0 0 *H aJPMՒ ]cѭC+kS+wZ1gY",YT41 j 6:~℩ D~Kؚl=u(ՎM?cF7@}T00 G0 *H 01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.300 010824164000Z 020824164000Z0T10 UEggert1 0 U*Lars10U Lars Eggert1 0 *H larse@isi.edu00 *H 0 |\Pw v~~ FDooӦA\- Cˀ4.)&{肋 ,z (ܷر߈T7_'txGH^tt/ҹB8%t<#ֲN V0T0*+e!0 00L2uMyffBNUbNJJcdZ2s0U 0 larse@isi.edu0 U 0 0 *H aJPMՒ ]cѭC+kS+wZ1gY",YT41 j 6:~℩ D~Kؚl=u(ՎM?cF7@}T0)0 0 *H 01 0 UZA10U Western Cape10U Cape Town10U Thawte Consulting1(0&U Certification Services Division1$0"UThawte Personal Freemail CA1+0) *H personal-freemail@thawte.com0 000830000000Z 020829235959Z01 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.3000 *H 0 32c %E>nx'gڈD)c5*mp<ܮto034qmOe KaU5u'rװ |CBPQ<9TIf - ki N0L0)U "0 0 10UPrivateLabel1-2970U 0 0 U 0 *H so&e4KYbDI j&*b ct mSK8P:l4撜n# KrgPo.X PW Ո9[9}4%MjÑ/<RbH10001 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.30G0 + a0 *H 1 *H 0 *H 1 020404195554Z0# *H 1H.ʻ %%hc 0R *H 1E0C0 *H 0*H 0 *H @0+0 *H (0 *H 101 0 UZA10U Western Cape10U Cape Town10 U Thawte1 0U Certificate Services1(0&U Personal Freemail RSA 2000.8.30G0 *H sC3ZcJE~QVsH:4mФyy 4 t+r~Pz Lcdl?06/R puJ j1X{ jg y%C&x7s43
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