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Re: [Discuss-gnuradio] UHD accessing metadata

From: Josh Blum
Subject: Re: [Discuss-gnuradio] UHD accessing metadata
Date: Thu, 06 May 2010 13:24:46 -0700
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv: Gecko/20100217 Shredder/3.0.3pre

gnuradio does not offer any kind of sample decoration. So, the metadata is present in the simple uhd source block, and dropped on its way out of the block.

You would need to make some kind of c++ app in gnuradio or maybe standalone to deal with the metatdata. I dont know another way.

Also, the uhd comes with an example app called rx_timed_samples.cpp, you may want to take a look at this to see how the api deals with the metadata. I will expand this example to include clock configuration when i get the chance as well.

I hope that helps,

On 05/06/2010 12:35 PM, Criss Swaim wrote:
I have been working with the uhd version of gnuradio and have attached a
gps unit to the usrp2 to set the pps.  So far, I have not figured out
how to extract the time (secs and nsecs) metadata for a signal sample.
This is mostly due to my limited C++ coding skills.  Has anyone
successfully extracted the time metadata and would you be willing to
share the C++ code to show me how to capture and extract the  time metadata.

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