Hi, I was just asking myself the same question but I'm not sure I understood your answer.
Is it possible to have two output streams of different data types? I want one to be unsignad char and the other one float or double. How is it to be coded? ...: gr_sync_block (..., gr_make_io_signature (1, 1, size_of (...)) gr_make_io_signature (1, 12, size_of (?????))) Regards, Irene Eric Blossom wrote: > > On Wed, Apr 26, 2006 at 11:50:39AM -0400, Chuck Swiger wrote: >> How do you declare two inputs of different data types? >> >> Several atsc blocks pass a stream of 'float' and also 'syminfo' >> (a struct of 4 ints). >> >> >From what I can tell, gr_sync_block allows many inputs and outputs, >> but only of the same type(?). >> >> gr_block::gr_block (const std::string &name, >> gr_io_signature_sptr input_signature, >> gr_io_signature_sptr output_signature) >> >> where >> >> gr_io_signature (int min_streams, int max_streams, size_t >> sizeof_stream_item) >> >> tia >> --Chuck > > Hi Chuck, > > You're right. FWIW, the underlying representation is designed to > support different types on each input or output stream, but the top > level constructor, gr_io_signature, doesn't implement an interface to it. > > I'm pretty sure that sizeof(atsc::syminfo) is 4, which is the same as > sizeof(float). This is true because the total width of the integer > bit fields in atsc::syminfo is <= 32. > > > Add > > assert(sizeof(float) == sizeof(atsc::syminfo)); > > somewhere in work, and then cast away. We lose clarity in the i/o > signature, but I'm pretty sure it'll work. [ It worked before ;) ] > > > E.g., > > int > foo::work(...) > { > const float *in_sample = (const float *) input_items[0]; > const atsc::syminfo *in_tag = (const atsc::syminfo *) input_items[1]; > > assert(sizeof(float) == sizeof(atsc::syminfo)); > > ... > } > > Eric > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- View this message in context: http://www.nabble.com/two-inputs-outputs-of-different-data-types-tp4104088p18253966.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio