Re: Pb with es1370 and smp
Wakko Warner (wakko@animx.eu.org)
Wed, 27 Oct 1999 12:20:42 -0400
> > Do you have found a solution about your problem
> > with playing a wave file ?
> > ( you get crackling noise ) .
> >
> > I have the same problem with playing MP3 .
> >
> I think that this is a timing problem with the DMA-timer.
> It sounds like that the driver plays a block of a specified length and
> then plays the next block of that length, but the problem is that
> between these blocks there is a delay so that the value of the D/A
> converter does not change for that delay. This gives something like a
> hole in the signal.
>
> I have then posted some program code which sets the fragment size to a
> bigger value, so that there are not so many holes per second, so
> reducing the distortion of the signal, but this does not solve the
> problem completely.
>
> As I am very busy at this time, I was not able to look deeper into the
> es1370 code for the reason now, but I am still interested in that issue.
>
> So I would like it, if the developers of the driver or any other people
> send me some documentation of the es1370 chip. Maybe this could help me
> finding the reason for that crackling noise.
>
> This crackling noise does not occur on /dev/dsp1, so it might help, if I
> know more about the differences between the devices behind /dev/dsp and
> /dev/dsp1
Seems like noone wants to look into this (And I don't even understand the
kernel). SMP has nothing to do with this. I found out that if you play an
8bit stereo causes the problem on /dev/dsp, but not dsp1. other samples
(8bit mono, or 16bit) doesn't cause this problem.
--
Lab tests show that use of micro$oft causes cancer in lab animals
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