2005-05-20 15:17:24

by Mayank Batra

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Subject: [Bluez-devel] Broadcast A2DP

Guys,

Is it possible to develop an application, that will
broadcast a2dp stream to more than 1 sink?

Something like an FM station?

What I want to know is that whether sufficient
bandwidth will be there or not?


Mayank

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2005-05-20 16:30:14

by Brad Midgley

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Subject: Re: [Bluez-devel] Broadcast A2DP

Mayank,

>>What I want to know is that whether sufficient
>>bandwidth will be there or not?
>
> I think it is not and besides this you might get into problems if you
> create a scatternet.

I suspect my itech clip is only insisting on being master if you
"connect" (just rfcomm, not sco) it first to the phone. Maybe Marcel
could clear it up if I'm wrong. Here's what I observe:

If the headset is connected (again, just rfcomm) and I start an a2dp
stream to it from the computer, it works fine until I move my bluetooth
mouse. The audio breaks up when the mouse is moving. What I suspect
happens is the computer is master to the mouse and slave to the headset.
I think the computer gives priority to its own piconet.

If the headset is not "connected" to the phone and I send music to it, I
can move the mouse and there is no loss of audio. Trying to initiate the
connection from phone to headset briefly causes the music to stop but
the phone connection fails and the music starts again. It seems to me
that the headset is just a slave device and won't be able to accept the
incoming connection.

Brad


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2005-05-20 15:42:10

by Marcel Holtmann

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Subject: Re: [Bluez-devel] Broadcast A2DP

Hi Mayank,

> Is it possible to develop an application, that will
> broadcast a2dp stream to more than 1 sink?

it will be possible.

> What I want to know is that whether sufficient
> bandwidth will be there or not?

I think it is not and besides this you might get into problems if you
create a scatternet. Most headphones I have seen require to be a master
of a piconet. Thus means that the source will create a scatternet and
the link manager must use hold mode to switch between both piconets. In
all my tests this was not working very good.

Regards

Marcel




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