Use the packet encoder block Regards, Vanush
On Thu, Apr 24, 2014 at 1:05 AM, Matthieu Imbert <matthieu.imb...@inria.fr>wrote: > Hi, > > I'm currently trying to take the output of a fft block and pipe it in a > tcp sink for (near) real-time processing outside of gnuradio. > > My question is: > > Assuming that I have vectors of n floats (the fft block outputs vectors of > floats or complexes, so I may need to pipe it to a complex-to-mag2 block to > convert it to an array of floats, but that's not the main point of my > question here), if I send them directly to the tcp sink, it will become a > stream of bytes, and my code outside of gnuradio won't be able to detect > the boundaries between vectors of n bytes. Actually it won't even be able > to detect the boundaries between floats. > > So I need to "frame" the data in a kind of basic protocol. For example: > each vector of n floats, insert a m bytes header with a magic identifier, > and perhaps a length and/or sequence number. > > I'm confused about what technique to use to achieve this, between tagged > streams, messages, pdus, packets: > > - I tried using tagged stream (with "stream to tagged stream"), and piping > it to "Packet Header Generator", but the output of the "packet header > generator" seems to be only the packet header, and I don't know how to > recombine it with the payload. > > - I tried using "tagged stream to pdu", but then I don't know what to do > of the pdu output, the only block I found which may input this data type is > "Socket PDU" but I don't understand its purpose. > > - Or should I use "simple framer"? > > I'd appreciate some advice on the best / most simple way to achieve this. > I'm new to gnuradio, so feel free to correct me on any errors (and accept > my apologizes if my question seems trivial). > > best, > > -- > Matthieu Imbert <matthieu.imb...@inria.fr> > http://graal.ens-lyon.fr/~mimbert/ > INRIA / LIP ENS-Lyon research engineer > http://www.inria.fr http://www.ens-lyon.fr/LIP > +33(0)472728149 > Monod campus, room GN1 Nord 3.52 > LIP ENS-Lyon, 46 allée d'Italie > 69364 Lyon cedex 07, FRANCE > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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