On Mon, Jun 06, 2011 at 09:33:52AM +0200, Michael Höin wrote:
> Hi all
>
> I have a problem with a big vector. The input/output of my entity is
> like:
> : gr_block ("sub_channel_vff",
> gr_make_io_signature2 (2, 2, sizeof (float)*3072, sizeof
> (char)),
> gr_make_io_signature2 (1, 2, sizeof (float)*5376))
>
> And my forecast is like:
> ninput_items_required[i] = 76/4;
>
> The problem is that one input Frame has a size about 76*3072= 233472
> values and I cut four parts (at different positions) of size 5376 out of
> it.
> If I run the simulation I get an error:
> .....is requesting more input data than we can provide.
> ninput_items_required = 19
> max_possible_items_available = 4....
>
> If I reduce the ninput_items_required value the simulation works, but
> the value reflectes not the truth and in the gr_block file is written:
> "The estimate doesn't have to be exact, but should be close". Knows
> anybody a solution or a detour to work with this big vectors?
>
> Any idea? Any help will be appreciatedHi Michael, without knowing what you're block's supposed to do, two solutions come to mind: 1) You re-think the functionality of the block. Does it really need these massive input vectors? 2) You re-write the block to operate on streams. This should not be a problem since you've already chosen a gr_block instead of a gr_sync_block. You might need some internal buffers (that operate outside the buffers provided by GNU Radio) and some state variables to remember where you are in the stream. Are you simply cutting stuff out of a stream? In that case, a re-write should be fairly simple. MB -- Karlsruhe Institute of Technology (KIT) Communications Engineering Lab (CEL) Dipl.-Ing. Martin Braun Research Associate Kaiserstraße 12 Building 05.01 76131 Karlsruhe Phone: +49 721 608-43790 Fax: +49 721 608-46071 www.cel.kit.edu KIT -- University of the State of Baden-Württemberg and National Laboratory of the Helmholtz Association
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