Date: Thu, 4 Apr 2002 15:11:39 -0500 From: Chip Marshall <chip@chocobo.cx> To: multimedia@FreeBSD.ORG Subject: Re: Soundblaster Live rear channels? Message-ID: <20020404201139.GA57081@chocobo.cx> In-Reply-To: <3CACAC92.3040506@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>
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[-- Attachment #1 --] On April 04, 2002, Lars Eggert sent me the following: > The Anarcat wrote: > >FreeBSD Audio Driver (newpcm) Mar 27 2002 12:56:06 > >Installed devices: > >pcm0: <Creative EMU10K1> at io 0x9000 irq 5 (4p/1r/0v channels duplex) > > > >So it has 4 play channels. newpcm supports multiple through the use of > >multiple channels, AFAIK. On -stable, newpcm supports this through > >hw.snd.pcm0.vchans. The default value is 0 which means there is only > >one virtual channel available. If you bump this to 1 or 2, you have > >more virtual channels available. These are accessible through > >/dev/dspX.Y where Y is the virtual channel. I have the same card in a 4.5-R box here, my hw.snd.pcm0.vchans is 0, and I have /dev/dsp0.[0123]. It appears that these are the hardware mixer channels for the card, as I can set 4 programs to each use one of them, and they can all play at the same time. I don't think these are virtual channels, but rather just sub-devices for the seperate channels the card supports. > I think I was unclear here when using "channel". What I'm trying to do > is getting sound out of the two rear speakers with a 5-speaker setup. > There's two separate cables that go from the soundcard to the speakers, > one is for the front pair and subwoofer, the other drives the two rear > speakers. No signal comes out of the latter. Perhaps to use the rear speakers, you need to feed in a special file format? I mean, for stereo, we don't feed two mono streams into two devices, we feed one stereo stream into a single dsp device. Perhaps you need to be feeding in a quad-channel stream into one of the dsp's? I have no clue really, just thought I'd toss the idea out there. -- Chip Marshall <chip@chocobo.cx> http://www.chocobo.cx/chip/ GCM/CS d+(-) s+:++ a20>? C++ UB++++$ P+++$ L- E--- W++ N@ o K- w O M+ V-- PS+ PE Y+ PGP+ t+@ 5 X R@ tv+() b++>+++ DI++++ D(-) G++ e>++ h->++ r++ y- [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (FreeBSD) Comment: For info see http://www.gnupg.org iD8DBQE8rLN68vyTVl6qbdQRAslsAJ9f52Bc38IExuCcShoRa8rTttV/BACfcnkW Q4LSsURoB3LTVF7I6DFl+70= =NHAd -----END PGP SIGNATURE-----help
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