[USRP-users] VRT Passthrough

Josh Blum josh at ettus.com
Fri Apr 12 13:54:47 EDT 2013



On 04/12/2013 10:24 AM, Joseph Payton wrote:
> Is there any straightforward way to receive and re-transmit the VRT packets
> directly using UHD, configuring a streamer or otherwise? (I am using the
> USRP N200)
> 

You might find this helpful; You can tell the device to stream to an
arbitrary socket:
http://files.ettus.com/uhd_docs/manual/html/usrp2.html#alternative-stream-destination

This means that you capture program is a simple loop with a socket recv
and write to file.

-josh

> I know that the conversion is done under the hood, but I have utility in
> getting the VRT packets onto a disk. Also, the overhead of raw packet
> capture is not attractive to me due to CPU constraints.
> 
> Right now the options that I see so far are:
> 
> 1. To keep track of the metadata on my receives  and reconstruct the VRT
> packet for my own use.
> 
> or
> 
> 2. To override / extend the io implementation to provide a "null" unpacker
> to be used in recv_pirate_loop, and just make sure that I am aware on
> the receive side that I am not receiving the usual output.
> 
> Many thanks in advance and thanks for help given in the past.
> 
> 
> 
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> 




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