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List:       gnuradio-discuss
Subject:    Re: [Discuss-gnuradio] Question about inputs and outputs of a block
From:       Josh Blum <josh () joshknows ! com>
Date:       2010-02-25 19:41:23
Message-ID: 4B86D263.2070905 () joshknows ! com
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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, elettra.pisa@libero.it
> <elettra.pisa@libero.it>  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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> Discuss-gnuradio@gnu.org
> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio



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