c++ - GNU Radio io_signature -


i'm getting gnu radio , after created new block, in main class have peace of code :

square_ff_impl::square_ff_impl()   : gr::block("square_ff",               gr::io_signature::make(<+imin+>, <+imax+>, sizeof (<+itype+>)), // input signature               gr::io_signature::make(<+omin+>, <+omax+>, sizeof (<+otype+>))) // output signature {     // empty constructor }

i don't know put in min , max (even after reading doc).

can give me examples please ?

imin - minimum number of acceptable input ports imax - maximum number of acceptable input ports omin - minimum number of acceptable output ports omax - maximum number of acceptable output ports

the documentation talks bit in iosignatures portion of blockscodingguide:

  • the first 2 parameters min , max number of ports, allows blocks have selectable number of ports @ runtime.

a value of -1 means "unlimited".

as example of source block, take @ io signature of null source block, takes no input:

null_source_impl::null_source_impl (size_t sizeof_stream_item)   : sync_block("null_source",                   io_signature::make(0, 0, 0),                   io_signature::make(1, -1, sizeof_stream_item)) { }

for sink, check out null sink, has no output:

null_sink_impl::null_sink_impl(size_t sizeof_stream_item)   : sync_block("null_sink",                io_signature::make(1, -1, sizeof_stream_item),                io_signature::make(0, 0, 0)) { }

and simple processing blocks, add_ff, takes unlimited input , produces 1 output stream:

add_ff_impl::add_ff_impl(size_t vlen)   : sync_block("add_ff",           io_signature::make (1, -1, sizeof(float)*vlen),           io_signature::make (1,  1, sizeof(float)*vlen)), d_vlen(vlen) { ...

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