Date: Fri, 28 Sep 2001 03:34:03 +0100 From: "cameron grant" <gandalf@vilnya.demon.co.uk> To: <joeo@cracktown.com>, <freebsd-multimedia@freebsd.org> Subject: Re: stable pcm problem with some linux games errs apps Message-ID: <00c201c147c6$09991a90$0504020a@haveblue> References: <Pine.LNX.4.30.0109271710530.12814-100000@asmodean-ssn.nks.net>
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> Setting up some debugging reveals that both these games do a ioctl
> DSP_SETFRAGMENT requesting only 1 DMA block.
the oss spec says:
The 16 most significant bits (MMMM) determine the maximum number of
fragments. By default, the driver computes this based on available buffer
space. The minimum value is 2 and the maximum depends on the total buffer
space available for the device. Set MMMM=0x7fff if you don't want to limit
the number of fragments.
> I was hoping that the workaround for would be a simple kluge, but
> chn_setblocksize(...) in /sys/dev/sound/pcm/channel.c has some additional
> logic in it that sets the blkcnt much higher...
that logic is only used where no blocksize is requested.
if i knew what it was trying to do by requesting 1 block, i could implement
it.
-cg
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