[Bluez-devel] AVDTP in BlueZ

[Bluez-devel] AVDTP in BlueZ

[Martin Raspaud]

Hi all,


According to the mailing archive (since september 2005) and the Todo
List there is no implementation of avdtp in BlueZ.
Is this right ?
I am planning to implement audio streaming (ogg) over bluetooth. If I
understand correctly (reading the mailing archive) there were attemps
to consider the bluetooth device as a soundcard using alsa. Is this
working ? Would this fit my purpose ? Would it replace avdtp in BlueZ ?

My idea was to implement an icecast plugin/patch to send the data over
bluetooth and then implement a reader on the phone/pda/some device.
Do you think it is doable ? Is someone already working on this ?

Do you any idea about that ?

Best regards

Martin



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Re: [Bluez-devel] AVDTP in BlueZ

[Brad Midgley]

Martin

> According to the mailing archive (since september 2005) and the Todo
> List there is no implementation of avdtp in BlueZ.
> Is this right ?

it is true in that you can't create an avdtp "socket" like you can an
l2cap socket. but we can still build up avdtp signaling in userspace
using l2cap connections.

> I am planning to implement audio streaming (ogg) over bluetooth. If I
> understand correctly (reading the mailing archive) there were attemps
> to consider the bluetooth device as a soundcard using alsa. Is this
> working ? Would this fit my purpose ? Would it replace avdtp in BlueZ ?

we only have a prototype that runs in userspace and accepts audio data
from stdin if you want to stream stuff.

i've been tinkering with an alsa plugin.

> My idea was to implement an icecast plugin/patch to send the data over
> bluetooth and then implement a reader on the phone/pda/some device.
> Do you think it is doable ? Is someone already working on this ?
> 
> Do you any idea about that ?

you are going to implement an a2dp sink in the phone? it is probably
doable and we do have code for it but it will take some adapting to put
it on another platform and it will require a decent-powered arm cpu.
(many phones have a dsp where the encoder could run a lot more
efficiently, but it's a big job to write a dsp task.)

brad


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Re: [Bluez-devel] Multiple headsets with one dongle

[Southwing - Miquel Puchol]

Hi Brad,

Thanks for your reply!

 >> The rfcomm channel communication is not where interference
 >> happens. It's when both headsets try to build the sco
 >> connection at the same time.

OK, that gives me some point where to start looking.

 >> I'm not totally sure how to do this anyway. Marcel has hinted
 >> at it and apparently there's a boot-time parameter to set
 >> something to allow two sco connections. I tried to capture
 >> everything in the btsco bug for multiple headsets, but this
 >> is all I come up with there:

This would be boot-time for the dongle's boot, or the actual machine's boot?

 >> Marcel adds: "To get more than one SCO channel working the
 >> hci_usb driver must be fixed to dynamicaly change the
 >> alternate settting."

Also, fixed as in repaired, or as in set to something permanent? I'll 
take a look at the archives and bug log.

Best regards,

Mike




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[Bluez-devel] AVDTP in Bluez

[Ivy]

Hi,

        I'd like to know that weather AVDTP has implemented and integrated with BLUEZ Stack or not ?.  I have gonethrough Bluez Mailing list. I had seen the discussion between Marcel and Aarthi about AVDTP Design. If it is implemented, where can i see that file ?.. 

        Thanks for your time and Help...

Thanks
-Ivy ..


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Re: [Bluez-devel] AVDTP in Bluez

[Brad Midgley]

Ivy,

There is no AVDTP code implemented in the kernel or bluez libs. The 
closest thing we have is an example of some AVDTP (specifically, just 
A2DP) negotiation in userspace by a2play.c. see bluetooth-alsa.sf.net.

Brad

Brad

Ivy wrote:
> Hi,
> 
>         I'd like to know that weather AVDTP has implemented and integrated with BLUEZ Stack or not ?.  I have gonethrough Bluez Mailing list. I had seen the discussion between Marcel and Aarthi about AVDTP Design. If it is implemented, where can i see that file ?.. 
> 
>         Thanks for your time and Help...
> 
> Thanks
> -Ivy ..
> 
> 
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