Date: Wed, 14 Mar 2001 11:04:24 +0000 From: Roger Hardiman <roger@cs.strath.ac.uk> To: "Andresen,Jason R." <jandrese@mitre.org>, freebsd-multimedia@FreeBSD.ORG Subject: Re: many questions with bktr(4) and pcm(4) Message-ID: <3AAF5038.7CD7489D@cs.strath.ac.uk> References: <200103100029.DAA49746@f434.n5020.z2.fidonet.org> <3AAE6FF8.3BDE9EFD@cs.strath.ac.uk> <3AAE9AD7.467C6FF3@mitre.org>
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Jason, > > > pci0: <unknown card> (vendor=0x109e, dev=0x0878) at 20.1 irq 10 > > > > This is the audio capture part of the Bt878 chip. > > It is unused. I really should supress this messag > > as it is nothing to worry about. > > Er, wouldn't that be useful for capturing movies with the BT8x8? > Right now I'm able to capture the video just fine, but the audio > is always problematic. Using the built in facility on the chip > seems like a very elegant solution, of course I don't actually > have the expertise to do this... Well it is sort of usefull. The typical setup is to use a short cable from the TV tuner card to your sound card, and to sample the audio there. Which is that we do in the FXTV application and how 99.9% of TV cards work. Just as there are problems with the 'normal audio' on TV cards, there is more than one way to wire up the Bt878's audio capture input and I've no idea which cards actually wire audio from the tuner or MSP34xx chips to the Bt878 audio capture hardware. The audio capture is only mono, but it does sample at sample rates of something like 150 kHz. The idea being that it can sample RDS (radio data) or digitally encoded stereo and then decode that. If someone wants to write support for the audio capture, I'll happily include it, but I don't think I'll ever write support for it unless someone paid me, as the typical setup is to sample with your sound card. Hope this explains it all ok. Roger To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-multimedia" in the body of the message
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