Re: [Discuss-gnuradio] File source and seek()

[Martin Braun]

On 03/10/2014 06:38 PM, trracer dangly wrote:
> Hello,
> 
> I am having some trouble getting the seek() function in the file source
> to work.
> 
> My program has a non-repeating file source, and a GUI button with the
> callback function set_button(). In the callback I have written the below
> code, which should reset the file source to the beginning of the file:
> 
> self.blocks_file_source_0.seek(0,0)
> 
> When I press the button before the file source has streamed to the end,
> the seek() works fine and resets the file source to the beginning. When
> I press the button after the file source has streamed to the end and
> stopped, the seek() does not work and nothing happens in the code. I
> suspect this has something to do with the scheduler thinking this block
> is done and ignoring it or deleting it or something, but I have been
> unable to get it working the way I want it to.

You're on the right track: In a non-repeating file source, the block
will return -1 after the file was read, which triggers a shutdown of the
FG. So, what you really want is to restart the flow graph.

Perhaps you need to write your own block which acts on your inputs.

M