Date: Fri, 18 Jul 1997 18:20:22 +0200 (MET DST) From: Luigi Rizzo <luigi@labinfo.iet.unipi.it> To: hasty@rah.star-gate.com (Amancio Hasty) Cc: multimedia@FreeBSD.ORG Subject: Re: sound and dma ... Message-ID: <199707181620.SAA17901@labinfo.iet.unipi.it> In-Reply-To: <199707181630.JAA05399@rah.star-gate.com> from "Amancio Hasty" at Jul 18, 97 09:30:38 am
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> No problem;specially, since , the dma subsystem is so complex for > just playing audio --- I think is amazing . Hopefully, with PCI > things will get better because the complex buffering scheme is > really about reducing latency to the sound card. yes except all sound card I can find are ISA units... But this discussion on the double buffering problem has made me finally remember that I forgot to implement such a scheme in the "asc" driver (for scanner) and this is probably the reason why, in color mode, I occasionally lose samples :( Latest snap of the sound code (with sndstat working and initial support for multiple boards of the same type) at http://www.iet.unipi.it/~luigi/snd970718.tgz this includes a critical fix to "pnp.c" which was the reason why my card had a tendency to hang during the probe... I have a test machine with 1 PnP device (CS4232) and an old sound galaxy which probes as SoundBlaster 2.1: rizzo# cat /dev/sndstat FreeBSD Sound Driver Jul 18 1997 Installed drivers: pcm0: <SoundBlaster 2.1> at 0x0240 irq 7 dma 1:0 pcm1: <SoundBlaster Pro 3.2> at 0x0220 irq 7 dma 1:0 rizzo# Cheers Luigi
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