On Sat, Jun 12, 2010 at 05:21:43AM -0700, Zohair wrote:
>
> Dear all,
>
> How can I define a 3-input block io signatures if the inputs are:
> 1- two float vectors with length LENGTH1 each. (from 5 to 12)
> 2- a complex vector with length LENGTH1^2
>
> output is:
> float vector with length LENGTH2.
>
> All what I dealt with before was inputs with same length but in case I dont
> know how to define this. Any help or hint, please?
>
> Thanks,
>
> Zoh
>
> ps: I'm using gr_sync_block
Taking a quick look at the docs and/or the gr_io_signature.h file reveals:
/*!
* \brief Create an i/o signature
*
* \param min_streams specify minimum number of streams (>= 0)
* \param max_streams specify maximum number of streams (>= min_streams or -1
-> infinite)
* \param sizeof_stream_item1 specify the size of the items in the first stream
* \param sizeof_stream_item2 specify the size of the items in the second stream
* \param sizeof_stream_item3 specify the size of the items in the third and
subsequent streams
*/
gr_io_signature_sptr
gr_make_io_signature3(int min_streams, int max_streams,
int sizeof_stream_item1,
int sizeof_stream_item2,
int sizeof_stream_item3
);
For the general case see:
/*!
* \brief Create an i/o signature
*
* \param min_streams specify minimum number of streams (>= 0)
* \param max_streams specify maximum number of streams (>= min_streams or -1
-> infinite)
* \param sizeof_stream_items specify the size of the items in the streams
*
* If there are more streams than there are entries in sizeof_stream_items, the
* value of the last entry in sizeof_stream_items is used for the missing
values.
* sizeof_stream_items must contain at least 1 entry.
*/
gr_io_signature_sptr
gr_make_io_signaturev(int min_streams, int max_streams,
const std::vector<int> &sizeof_stream_items);
In your case:
my_block::myblock(..., size_t length1, size_t length2)
: gr_sync_block("my_block",
gr_make_io_signature3(3, 3,
length1 * sizeof(float),
length1 * sizeof(float),
length1 * length1 *
sizeof(gr_complex)),
gr_make_io_signature(1, 1, length2 * sizeof(float)))
{
...
}
If you want to enforce the range limit on length1, check length1 in
your constructor and throw std::invalid_argument("my_block: length1 not in
[5,12]")
if you don't like the value.
Eric
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