Message-ID: <20050523121022.83208.qmail@web8307.mail.in.yahoo.com>
From: Mayank Batra <mayankbatra@yahoo.co.in>
Subject: Re: [Bluez-devel] Broadcast A2DP
To: bluez-devel@lists.sourceforge.net
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Date: Mon, 23 May 2005 13:10:22 +0100 (BST)

Marcel,
> 
> > 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.


Consider the simple case, when the headphones will not
want to become the master of the piconet, so, there
will be only a single piconet with the a2dp source as
the master. Thus no scatternet.
(IVT's BlueSoleil, for instance, does not require to
be master)

Now, my question is, whether I can send a broadcast
packet on the L2CAP layer. If yes, then how?

Or will I have to send packets one after the other to
all the sinks. If this is the case then I'm afraid
that we'll face shortage of bandwidth, cause after sbc
encoding, bit rates are no less than 210 kbps, which
means that no more than 3 sinks can be supported (for
a bandwidth of 723 kbps).

Also, I read somewhere that at L2CAP level, we can
form groups similar to IGMP. Is that true? or rather,
is it there in Bluez?


Mayank Batra


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