Message-ID: <40376D2B.1060904@superbug.demon.co.uk>
From: James Courtier-Dutton <James@superbug.demon.co.uk>
MIME-Version: 1.0
To: =?ISO-8859-1?Q?Fred_Sch=E4ttgen?= <bluez-devel@schaettgen.de>
CC: bluez-devel@lists.sourceforge.net, Simon Vogl <vogl@soft.uni-linz.ac.at>
Subject: Re: [Bluez-devel] sco link help needed
References: <4034CA08.50500@soft.uni-linz.ac.at> <200402191629.38846.bluez-devel@schaettgen.de>
In-Reply-To: <200402191629.38846.bluez-devel@schaettgen.de>
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Sender: bluez-devel-admin@lists.sourceforge.net
Errors-To: bluez-devel-admin@lists.sourceforge.net
Date: Sat, 21 Feb 2004 14:37:31 +0000

Fred Sch?ttgen wrote:
> On Thursday 19 February 2004 15:36, Simon Vogl wrote:
> 
>>Hi,
>>I desparately need some help with audio links:
>>I have written two small programs that use my pc to emulate a headset
>>and a handsfree device. Both work quite nicely, the rfcomm-based
>>initialization takes place, and I get an SCO connection, but mysteriously,
>>I don't get a single byte of audio data (I don't see it with hcidump
>>neither).
>>
>>my setup:
>>* Acer usb bluetooth dongle
>>* test phones used: p800 (headset), p6600/ngage/3650 (handsfree) with no
>>luck... * kernel 2.4.23
>>* bluez utils&lib from cvs
>>* and yes, i did register hset profile via sdptool....
>>
>>I had the program running perfectly already with a T68i....
>>Any help appreciated heavily (for example a traace of a successful
>>connection...), Simon
> 
> 
> I wrote a small handsfree application as a part of the KDE Bluetooth 
> Framework. It basically worked, even though it had problems with an ever 
> increasing lag, which has probably nothing to do with bluez. But at the 
> moment it's broken and it's not very high priority, since my microphone is 
> also broken ;)
> But you might take a look at it.. it's in kdeextragear-3:
> http://webcvs.kde.org/cgi-bin/cvsweb.cgi/kdeextragear-3/kdebluetooth/handsfree/
> I'll try to fix it during the next days.
> 
> Btw. I'm not sure if the sound doesn't work currently because of a kernel 
> problem. Maybe I should try with an older kernel.. It used to work with 
> 2.4.24 if I remember correctly.
> 
> greetings
> Fred
> 
For those interested, I am planning to write an alsa driver for 
bluetooth headsets.
The alsa driver module would load into kernel, but not present any sound 
devices.
Once a pairing had been set up (a small tool will be used for the 
pairing), the alsa driver module would then dynamically add a sound card 
to the kernel device list, and this sound card would work just like any 
other sound device in linux.
The alsa driver would handle both iso and rfcomm connections, iso for 
the sound, rfcomm for mixer volume etc.

Is anyone else working on this, or shall I start alone?

Cheers
James


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