[Discuss-gnuradio] streaming from file

[Nowlan, Sean]

Hi all,

 

I am working on a custom block that tags a stream based on a binary file stretched into unpacked form:

 

(1)                              (2)                                        (3)

gr_file_source(repeat=false) --> gr_packed_to_unpacked(1, gr.MSB_FIRST) --> my_block

 

I want to come up with a good way to detect in my_block whether the stream input from (2) is finished. I guess gr_file_source will return WORK_DONE first, but I don’t know if/how that ripples down to my_block. Basically I want to be able to tag the last incoming sample with an end-of-burst tag, but I don’t know how to do this without having advance knowledge about the size of the source file.

 

Thanks,

Sean