On Wed, Aug 1, 2012 at 3:46 PM, Alexander Olihovik <ano...@virginia.edu> wrote: > Hi all! > I'm writing a custom sink block in Python with multiple input ports of all > the same data type. > I've been reading Josh's block coding guide, but I'm confused at one point: > The value returned by a block should be the number of items produced by that > block. > Is this to say that if I have multiple ports, I may return the value of > input_items[0]? > Or is it correct to say that I must return the sum of all input_items[i], i > = range(number of input ports)? > > > I would like to create a synchronous block where all ports consume and > produce an equal number of items every time the work function is called. > However, it appears that there are times when input_items[0] != > input_items[1] != ... != input_items[numPorts-1] > If I were to return input_items[0], I would assume that this would not yield > the results I expect! > > Any help is greatly appreciated! > > From, > Alex
If you have a block with multiple input items and you want to produce the same number every time, noutput_items will tell you how much you are capable of producing on every output stream. When you 'return noutput_items', you are saying that you have produced that many items on EVERY stream. There is another way that specifies the same thing. Each block consumes some number of samples on every input stream and produces some number of samples on every output stream. You can individually specify "produce(i, N_i)" and "consume(o, N_o)" on each input and output stream, respectively. In this case i is the input stream and N_i is the number of items consumed on that input stream and o is the output stream and N_o is the number of items consumed on that output stream. When specifying your own 'produce' values, though, make sure to return WORKED_CALLED_PRODUCE, to tell the scheduler that you have done this yourself. But it sounds like you want to produce the same amount on every stream, so you should be fine just using 'return nouput_items'. Tom _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
