Re: real-time threaded IO with low latency (audio)
David Schleef (ds@stm.lbl.gov)
Fri, 23 Jul 1999 23:21:10 -0700
On Sat, Jul 24, 1999 at 03:14:58AM +0000, Gerhard Mack wrote:
> On Fri, 23 Jul 1999, Ingo Molnar wrote:
>
> > the whole 'why sound skips' problem i think lacks one major necessery
> > component: information. Nobody really ever analyzed what the problem
> > really is/was. I do have a awe64 soundcard (which i almost never use), if
> > you (or anyone else) could point to a method to make sound-playback
> > produce bad quality, i'd be happy to analyze the problem. Is running
> > mpg123 enough to see the problem? What should i do to make sound skip?
>
> I've tried to do this again and discovered that it's much harder to do
> then it used to be.
>
> Start mpg123 with no buffer parameter.
> Then start a kernel compile.
>
> Mpg123 will skip as the disk usage gets heavy.
>
> Somewhere between 2.2.8 and 2.3.4 something drastically reduced the sound
> dropouts on my system. I used to be able to make the sound skip even with
> "mpg123 -b 1024" but that is no longer the case.
>
> Gerhard
>
I have an ISA soundblaster on the motherboard, and a CDROM on an
ISA controller. If I try to access the CDROM while playing sounds,
like playing an MP3 off the CDROM, or burning a CD while listening
to realaudio, I get skips. Absolutely no skips if I'm not using
the CDROM. Kernel is 2.2.10.
dave...
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