[Discuss-gnuradio] change number of input bytes in block

[steve]

Hi,

i've a _bb block that i wrote. On the first call to work() i
get 2047 bytes, 2nd call 127, then 7 and then 1 byte ..then the
whole thing starts again.

I would like to get the same amount of data for each call to
work() (e.g. always 512 bytes on input). Is that possible?

Where does 2047, 127, 7 and 1 come from anyway?
(2^11 - 1, 2^7 -1, 2^3 - 1, 2^1 - 1)

steve