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Re: [Discuss-gnuradio] Question about inputs and outputs of a block


From: Josh Blum
Subject: Re: [Discuss-gnuradio] Question about inputs and outputs of a block
Date: Thu, 25 Feb 2010 11:41:23 -0800
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.9pre) Gecko/20100217 Shredder/3.0.3pre

gr_make_io_signature2 and 3? Common mr gnuradio, with your fancy c++ and your smart pointers and your swig. How-about replacing this with a single gr_make_io_signature with some parameter defaults:

gr_make_io_signature(min, max, io_size0, io_size1=0, io_size2=0, io_size2=0... io_size7=0)

-Josh

On 02/25/2010 06:57 AM, Tom Rondeau wrote:
On Thu, Feb 25, 2010 at 9:26 AM, address@hidden
<address@hidden>  wrote:
Hi all,

I'd like to know if it's possible to create a block with two inputs (or two
outputs) having different sizes.
For example, a block that takes a vector of N numbers on one of its two inputs
and a stream (a vector which has only one element) on the other input.
I already tried to create a block with these characteristics, but I failed.
Please tell me if this is possible.

Best Regards,

Elettra.

Yes, this is possible (in C++ blocks). You will make the IO signature
using "gr_make_io_signature2", which takes the standard (min inputs,
max inputs) as the first two arguments and the next two arguments are
the item sizes for the different inputs/outputs. You can also use
"gr_make_io_signature3" or "gr_make_io_signaturev", which takes a
vector for the signature to have different stream sizes for any number
of ports.

We used this extensively in the OFDM code. For example, in
gr_ofdm_sampler, on the input, we take in a stream of complex values
on input 0 and a stream of characters (that act as flags) on input 1.
The IO signature looks like:

gr_make_io_signature2 (2, 2, sizeof (gr_complex), sizeof(char))


Tom


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