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Re: [Discuss-gnuradio] fundamentals of block-connections, message queue

From: Douglas Geiger
Subject: Re: [Discuss-gnuradio] fundamentals of block-connections, message queue etc.
Date: Thu, 27 Aug 2009 11:44:35 -0400

On Thu, Aug 27, 2009 at 11:00 AM, Ulrika Uppman<address@hidden> wrote:
>  Thank you both very much for your responses Doug and Colby. I have now gone 
> through the code in gr-usrp2 and usrp2/host thoroughly and I can see how the 
> data is handled before sent on to the processing blocks.
> I can also see that the metadata is discarded at a point, and I found some 
> post in the archive about that this will be changed in later releases. I'm 
> curious if anyone knows if this is something anyone is working on at the 
> moment?
> /Ulrika

As I understand it that is currently waiting on the message-passing
functionality (which is putting the main functionality of mblocks into
the standard gnuradio block API). I would imagine it will actually
show up with/after the switch to the VRT format (vs. the current raw
ethernet frames + thin custom header).

In the meantime, if you need the information you could create a custom
usrp2 source block which saved the metadata somewhere. Not for the
faint of heart perhaps, but certainly doable. Then the real question
becomes what you want to do with the metadata (e.g. do you just want
to use it in the source block, or do you want to pass it along to the
subsequent block(s)).


Doug Geiger

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