bluez audio questions

Bluez-devel deker 2 participants 2 messages Oct 16, 2008 Bluetooth drivers

Share & tools

deker

author

2008-10-16 19:58 UTC #0 lore raw

So, per Brad's advice I've been following the audio HOWTO at
http://wiki.bluez.org/wiki/HOWTO/AudioDevices

I seem to either not be getting something, or bluez has changed it's dbus interface for audio dramatically. Looking at the HOWTO, it would appear that I have to active the audio service before I can send audio to a device. Great, no problem. Ok, one problem...org.bluez.Manager.ActivateService doesn't seem to exist. Looking at the dbus API spec in the 4.13 source tarball doesn't list it, and looking at dbus with D-Feet I see what matches the API listed in the docs. Is there some new method for service activation I'm missing?

Any help is appreciated. I really don't feel like this should be rocket surgery, I guess I just haven't found the bluez-audio Rosetta Stone yet...

Thanks again,

-d

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Bluez-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/bluez-devel

Johan Hedberg

2008-10-16 21:54 UTC #1 lore raw

Hi,

Quoted 2 lines · deker

So, per Brad's advice I've been following the audio HOWTO at
http://wiki.bluez.org/wiki/HOWTO/AudioDevices

Unfortunately the wiki hasn't been updated for 4.x. The instructions there only apply for 3.x. Any help updating it for 4.x is appreciated (the only reason that hasn't happened is lack of time).

Quoted 10 lines

I seem to either not be getting something, or bluez has changed it's dbus interface for audio dramatically. Looking at the HOWTO, it would appear that I have to active the audio service before I can send audio to a device. Great, no problem. Ok, one problem...org.bluez.Manager.ActivateService doesn't seem to exist. Looking at the dbus API spec in the 4.13 source tarball doesn't list it,
and looking at dbus with D-Feet I see what matches the API listed in the
docs. Is there some new method for service activation I'm missing?

If you're interested about the differences between 3.x and 4.x I'm sure you'll find discussion about it in the mailing list archives (probably linux-bluetooth though since that's the official one these days) and iirc Marcel even wrote an article about it in the bluez blog (www.bluez.org).
The API reference documentation itself is available in the doc subdirectory of bluez.

Quoted 4 lines

Any help is appreciated. I really don't feel like this should be rocket
surgery, I guess I just haven't found the bluez-audio Rosetta Stone yet...

Setting up a headset with 4.x should in theory be much simpler than with 3.x. First you need to pair the headset, discover its services and create a D-Bus object for it. This is all done with just one operation in 4.x, which is by calling the CreatePairedDevice method. You can either use some GUI like bluetooth-wizard from bluez-gnome to do this or if you're just using the command line you could use the simple-agent python script from the test subdirectory:
./simple-agent hci0 <headset address>
It'll ask you for the pin on stdin.

After this first step you should be able to use your headset the same way as you did with 3.x. E.g. with alsa have your .asoundrc set up and configure your favorite alsa application to the entry in it.

Johan