Date: Sat, 1 Jan 2000 04:52:30 -0000 From: "Cameron Grant" <gandalf@vilnya.demon.co.uk> To: "Seigo Tanimura" <tanimura@r.dl.itc.u-tokyo.ac.jp>, <dmmiller@cvzoom.net> Cc: <current@freebsd.org>, "Seigo Tanimura" <tanimura@r.dl.itc.u-tokyo.ac.jp> Subject: Re: Newpcm is broken again for mpg123 (ESS 1868 isa sound card) Message-ID: <001f01bf5414$02bbbb80$0304020a@rings> References: <14429.46098.1195.72159A@rina.r.dl.itc.u-tokyo.ac.jp><14433.63218.157116.72159A@silver.carrots.uucp.r.dl.itc.u-tokyo.ac.jp><386278C7.B748EEF5@cvzoom.net><14434.52947.683451.72159A@rina.r.dl.itc.u-tokyo.ac.jp><14436.13492.839612.72159A@silver.carrots.uucp.r.dl.itc.u-tokyo.ac.jp><14439.4177.642029.72159A@rina.r.dl.itc.u-tokyo.ac.jp><14439.26155.338725.72159A@silver.carrots.uucp.r.dl.itc.u-tokyo.ac.jp><386AB7A8.DC369061@cvzoom.net> <14445.33821.200059.72159A@silver.carrots.uucp.r.dl.itc.u-tokyo.ac.jp>
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> Donn> "ba ba ba ba ba ba ba ba ba ba ba ba ba ba". I have the ESS
> Donn> 1868, of course. Well, I (wisely) saved my old kernel as
> Donn> /kernel.good and just booted into that.
>
> Donn> Could you also say what was fixed if you get around to it? I'd
> Donn> to learn a little more about the sound driver.
> The following things were in the recent mail of mine:
>
> - All ioctl(2)s go to see the secondary buffer(if I have forget nothing).
> - chn_setblocksize() changes the size of the secondary buffer.
> - chn_mmap() maps the secondary buffer.
> - chn_poll() invokes DMA.
> - chn_wrintr() performs DMA emulation for pcm devices with no DMA
> functionality(requested by nyan).
> - SNDCTL_DSP_SETFRAGMENT handles the count correctly.
> - GETI/OSPACE returns the number of fragments.
> - DMA transfer keeps running upon underrun. Some DSPs seem to end up
> with an unpredictable result if the DMA gets stopped followed by
> immediate restart. This revokes the change in
sys/dev/sound/pcm/channel.c
> rev 1.12.
> - chn_write() and chn_read() returns EAGAIN for nonblocking if there
> are no space to write or data to read.
the ess problem was a result of me reducing the buffer size to 8k instead of
64k to see what would happen. only ess cards seem to have problems, so it's
back to 64k for them but 8k for other isa cards.
- cameron
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