gnuradio add code to file_sink

Question

I want to store data from an USRP1 with a file sink. But I need some more logic, i.e. I don't want to store all the data but only some "events" (changes which exceed some threshold). For that I want to use a sliding window and store only the the specific vectors. Does anyone knows where I can add this code?

Thanks, Tino

Answer 1

Answered this on discuss-gnuradio:

Then don't put the logic into the file sink -- use, for example, the squelch block in a setting that doesn't let samples through as long a certain threshold hasn't been crossed for a configurable period of time -- or write that block yourself, it's not too hard if you read a bit up on stream tags; have you met the guided tutorials?