Date: Mon, 9 Dec 1996 16:41:37 -0800 (PST) From: Doug White <dwhite@gdi.uoregon.edu> To: multimedia@freebsd.org Subject: GUS & Mbone: more updates Message-ID: <Pine.BSI.3.94.961209162258.1592A-100000@gdi.uoregon.edu>
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Hello again... After I replaced my VAT with a full duplex version from rah, the looping and popping and whatnot has stopped. I've been watching the IETF stuff for several hours now and it works like a charm. The only annoying thing is that the audio cuts out every so often, but I think this is from problems at the gateway or transmitter at ietf2.bbnplanet.com so I'm not worried about it. I've noticed that the volume bars lag quite a bit behind the audio, such that I've just turned them off. Any ideas behind that? The thing that does worry me is the excessive debugging output from the kernel. I get lots of these: isa_dmastart: channel 1 busy isa_dmastart: channel 3 busy I know this is a silly stupid thing, but I can't remeber where this is at. Someone have the patch? (BTW: these pop up whenever I jump between vats (I'm watching both IETF channels currently), and just every so often. Any guesses why both the play and record DMAs bounce? Secondly, when I was using the half-duplex vat, I got a lot of these lines: Dec 8 23:55:26 gdi /kernel: write select 1 Dec 8 23:55:27 gdi last message repeated 672 times Dec 8 23:55:27 gdi /kernel: isa_dmastart: channel 3 busy Dec 8 23:55:29 gdi /kernel: write select 0 Dec 8 23:55:29 gdi last message repeated 4 times Dec 8 23:55:29 gdi /kernel: write select 1 Dec 8 23:55:31 gdi /kernel: write select 0 Dec 8 23:55:31 gdi last message repeated 4 times Here is the interesting part. The audio was clear until the 'channel 3 busy' message came up. Then I got the write select 0's interspersing thoughout the write select 1 messages. (I got these write select's regularly.) At the same time, the looping, popping, and general poor audio started up. I'm guessing that these status messages may be related to the poor audio output from the half duplex vat (which must be used on SoundBlasters). Note that i got the exact same poor output until I bumped my vat to the full duplex version. I still have the half-duplex, so I'd be glad to do some testing. I'll only have my net until midday tomorrow or so, so get back to me soon if you want to deal with this before January. I'm not experienced enough programming to track down this stuff. I'm hoping someone will pick this up (bill?) and work with this. I'd really like to see the half-duplex vat's audio quality improve, as many of us are stuck with them and don't want to spend the $xxx on a gus when (IMHO) the awe32 has nicer MIDI audio :), and paid $200-300 for the AWE originally. Finally: all is well at gdi. Now to bludgeon the qcam into shape again and play with increasing the fps... Doug White | University of Oregon Internet: dwhite@resnet.uoregon.edu | Residence Networking Assistant http://gladstone.uoregon.edu/~dwhite | Computer Science Major
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