Re: [Discuss-gnuradio] Block with N inputs and M outputs (M>=N)

[Michael Dickens]

Just a quick additive note, all from my testing of 
"set_output_multiple()":

"set_output_multiple (M)" will work so long as M isn't too big.  
Anything up to 100 or so seems to work OK; even 1000 or so usually 
works.  5000 or higher generally doesn't work, though I'm sure there 
are specific values which would work (e.g. powers of 2 are more likely 
than prime numbers).  Unless your M and N are "small enough", then 
you'll likely need to inherit from "gr_block" directory and use 
"general_work()".  Using a finite-state machine (FSM; e.g. the GMSK 
packet sink), if your task can be broken down into parts as well as 
picked up from available "history", would allow for a much more robust 
implementation - taking in whatever input data is available, not just a 
given multiple of some number, and producing whatever it can from that 
data.  The trade-off is that "forecast()"ing the number of input items 
required for a given number of output items is potentially more 
challenging ... could depend on the amount of accumulated history, what 
state the FSM is in, etc.. - MLD