Messages in this thread | | | Date | Wed, 27 Oct 1999 12:20:42 -0400 | From | Wakko Warner <> | Subject | Re: Pb with es1370 and smp |
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> > 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.
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