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From: stefan@rabas.info
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Date: Mon, 19 Dec 2005 13:27:30 +0100

hello

I have a problem getting my a2dp connection onto my headset to work on my linux
machine.
But the sco connection works (I didn't test the mic sofar).

I searched the internet for a hint how to solve this matter, but didn't find
anything.
So I think this is the appropriate spot to post my problem.

  Sorry if I'm wrong.

I'm running Debian Sarge with a newly compiled kernel 2.6.14.3.
I got the whole bluetooth subsystem (except debugging I think) coded into the
kernel,
along with the ALSA system.
Following packages are installed:

bluez-utils    2.15-1.1
alsa-base      1.0.8-7
alsa-utils     1.0.8-4

The bluetooth-alsa version is the 0.4 from the cvs. It compiled without any
error,
along with the kernel snd-bt-sco module.

To test the sco connection I did the following:

-load snd-bt-sco
-pair headset with computer ('hcitool cc <btaddr>' with auth and encrypt enabled
in
 hcid.conf, as I think a2dp requires both)
-'btsco <btaddr>'
-play audio using xmms with appropriate alsa-device

After aborting btsco, but leaving the headset still paired I tryed to play audio
via
the command provided on the official bluetooth-alsa site:

 >debian:/usr/src/btsco-0.4# hcitool con
 >Connections:
 >        < ACL 00:13:1B:00:50:32 handle 46 state 1 lm SLAVE AUTH ENCRYPT
 >debian:/usr/src/btsco-0.4# mpg123 --au - smooth.mp3 | ./a2play
00:13:1B:00:50:32
 >High Performance MPEG 1.0/2.0/2.5 Audio Player for Layer 1, 2 and 3.
 >Version 0.59r (1999/Jun/15). Written and copyrights by Michael Hipp.
 ...(I Cut out part of the mpg123 output)
 >Playing MPEG stream from smooth.mp3 ...
 >Junk at the beginning 49443303
 >MPEG 1.0 layer III, 192 kbit/s, 44100 Hz joint-stereo
 >out of sync (0x2e)
 >couldn't read header on -

At next I tryed the seccond command provided on the site:

 >debian:/usr/src/btsco-0.4# mpg123 --au - smooth.mp3 | sbc/sbcenc |
./sbc/rcplay 00:13:1B:00:50:32
 >High Performance MPEG 1.0/2.0/2.5 Audio Player for Layer 1, 2 and 3.
 ...
 >Playing MPEG stream from smooth.mp3 ...
 >Junk at the beginning 49443303
 >MPEG 1.0 layer III, 192 kbit/s, 44100 Hz joint-stereo
 >Can't get channel number: Success

I'm focussing on the "out of sync" error message now.
The usage of a2play tells me that I'm able to define the input file directly.
So I did:

 >mpg123 --au - smooth.mp3 > smooth.au
Now I got the song in sun audio format.

I tried the following next:

 >debian:/usr/src/btsco-0.4# ./a2play 00:13:1B:00:50:32 smooth.au
 >out of sync (0x2e)
 >couldn't read header on smooth.au

Next up was a different audio format, and hey, the errorcode changed:

 >debian:/usr/src/btsco-0.4# ./a2play 00:13:1B:00:50:32 smooth.mp3
 >out of sync (0x49)
 >couldn't read header on smooth.mp3

So there must be something wrong with the audioformat, I guess.
I seriously don't know which one works or should work.

The headset istself is called "Cyber Headphone".
At least it shows up that way when i do 'hcitool scan'
The headset itself works fine with the a2dp connection running winXP and a
Toshiba stack.

Thanks for the help.

Stefan Rabas



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