Date: 17 Jan 2000 18:28:33 +0100 From: Dag-Erling Smorgrav <des@flood.ping.uio.no> To: CGiordano@ids.net Cc: Reinier Bezuidenhout <rbezuide@oskar.dev.nanoteq.co.za>, freebsd-current@FreeBSD.ORG Subject: Re: newpcm Message-ID: <xzpsnzwobem.fsf@flood.ping.uio.no> In-Reply-To: Chris Giordano's message of "Wed, 12 Jan 2000 02:45:52 -0500" References: <200001110908.LAA06044@oskar.dev.nanoteq.co.za> <387C3130.4930E69B@ids.net>
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Chris Giordano <CGiordano@ids.net> writes: > Luigi Rizzo explained this behavior in the old pcm driver > about a year or so ago. I believe it was due to some applications > setting a fixed buffering size with the SETFRAGMENT(?) ioctl, which > was not implemented in old pcm and then mistakenly writing smaller > than intended sound samples because they assumed a different buffer > size. I don't know if this applies to newpcm, but it sounds like > the same symptoms. > > Check the -current mailing list archives for pcm0 and xgalaga. -multimedia, actually: <URL:http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=245121+249137+/usr/local/www/db/text/1998/freebsd-multimedia/19980215.freebsd-multimedia>; I (and many others, I'm sure) would be very grateful if somebody would implement Luigi's first suggestion, to wit: > 1) complete the SETFRAGMENT (or whatever it is called) implementation > (not hard, you just need to reduce the blocksize in the dma buffer > descriptor and reset the dma channel; The ioctl in question is SNDCTL_DSP_SETFRAGMENT. Its semantics are described in the "Making audio complicated" section of the OSS Programmer's Guide: <URL:http://www.opensound.com/pguide/audio2.html>. DES -- Dag-Erling Smorgrav - des@flood.ping.uio.no To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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