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Re: [Discuss-gnuradio] A few questions about subclassing gr_block
From: |
Martin Braun (CEL) |
Subject: |
Re: [Discuss-gnuradio] A few questions about subclassing gr_block |
Date: |
Fri, 3 May 2013 09:10:13 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, May 03, 2013 at 09:08:34AM +0200, Martin Braun (CEL) wrote:
> > Currently I have an implementation of the block, but I am having trouble
> > understanding the relationship between ninput_items and noutput_items.
> > When I
> > feed the block from a file source consisting of 720 samples, I get
> > ninput_items
> > [0] = 720 and noutput_items = 512. Does this value for noutput_items mean I
> > can only consume and copy 512 of the input samples? And do I need to
> > implement
> > forecast if I want to output more?
>
> That depends. Do you *really* want to output more? How many? What if
> your have 1440 items at the input?
>
> Basically, this is telling you there's space for 512 items in the output
> buffer. If you can use a sync_block, you'll never run into these
> problems, because there's only one value.
Also, there's lots of other functions to control the output buffer size,
e.g. set_output_multiple(), set_min_output_items()...
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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