Re: [Discuss-gnuradio] A block with different input signatures

[Zohair]

Oh That's makes sense. Thanks a lot.


Eric Blossom wrote:
> 
> 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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> 
> 

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