From: Fred =?iso-8859-1?q?Sch=E4ttgen?= <bluez-devel@schaettgen.de>
To: bluez-devel@lists.sourceforge.net
Subject: Re: [Bluez-devel] sco links
References: <4045E93F.4040900@soft.uni-linz.ac.at> <4045F5AF.2000107@superbug.demon.co.uk>
In-Reply-To: <4045F5AF.2000107@superbug.demon.co.uk>
Cc: Simon Vogl <vogl@soft.uni-linz.ac.at>,
   James Courtier-Dutton <James@superbug.demon.co.uk>
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Date: Wed, 3 Mar 2004 17:17:06 +0100

On Wednesday 03 March 2004 16:11, James Courtier-Dutton wrote:
> Simon Vogl wrote:
> > hi,
> > can anyone help me with my sco link? in about 50% of cases, the audio
> > data has an offset of one byte, resulting in terrible noise. I think I
> > saw a flag in a packet header somewhere that indicates the number of
> > bytes to skip
> > until the audio data starts -- I looked through the bt specs several
> > times now
> > but can't find it again. Anyone has a clue for this?
> > Simon
>
> The terrible noise will be lost interrupts

I have also noticed that problem. When I just tried with hstest, 2 out of 5 
tries were noise, the rest was perfect.
I don't think is has anything to do with interrupts, because the the problem 
lasts for the whole duration of the connection or it doesn't appear at all.
Also could I work around that problem somewhat in an own application by 
guessing the byte order of the 16-bit audio samples. So I also think that 
there is something wrong with some offset.

Btw. I'm currently running 2.4.24, so maybe this has been fixed in 2.4.25. 
When comparing the ouput of scotest with that of hcidump, it looks like it is 
not the same every time... with scotest and hcidump running on the same 
machine, shouldn't the SCO data that's displayed by hcidump be exactly the 
same as the output of hstest? 

greetings
Fred


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