Yes, each "item" is supposed to be a vector of 10000 floats; and yes, each input stream contains 10000 floats. I chose a vector type for flexibility but I could always go back to turning it into a "plain old data".
In that case, could I pass a multidimensional array as an input argument to general_work? For example, I pass array_name[2][10000] where the main index [2] in this case, represents 2 inputs streams? I don't really intend to vary the input and output rates, but thanks for the suggestion on using gr_sync_block! I'll try it too. As a side note to <pedantic>, I already created functions that do just that. It's already incorporated into the main signal processing block that I am creating. But thanks for the suggestion! I'll see if I could use it. =) On Jan 7, 2008 11:40 AM, Eric Blossom <[EMAIL PROTECTED]> wrote: > On Mon, Jan 07, 2008 at 10:28:39AM +0800, Jonas Gacrama wrote: > > These are some of the input parameters of gr_block::general_work() : > > > > input_items vector of pointers to the input items, one entry per input > > stream > > output_items vector of pointers to the output items, one entry per > > output stream > > > > Am I correct in understanding that the input_items CAN point to a > > vector<float> type of inputs? > > No, the data items must be "plain-old-data"... > Something that can be copied safely with memcpy. > > > I plan to implement two input channels > > of vector<float> type. Therefore I plan to pass TWO POINTERS of > > vector<float> type as "input_items" to general_work. > > Do you mean that each "item" is conceptually a vector of 10,000 > floats? And that your block operates on two input streams, each of > which contains "items" that are vectors of 10,000 floats? > > If so, you input signature should be: > > gr_make_io_signature(2, 2, 10000 * sizeof(float)) > > > Unless your block has a time varying i/o rate between input and > output, I'd recommend that you derive your class from gr_sync_block > instead of gr_block. It's easier that way. > > > Note that the discussion on this website: > > "http://www.gnu.org/software/gnuradio/doc/howto-write-a-block.html"; > > only used one > > "channel" of inputs since it only took values from a single stream. I > > plan to take TWO CHANNELS of inputs wherein each channel contains > > 10000 inputs. > > <pedantic> > > One of the joys of Free Software is that the code is available to > inspect. There are 100's of blocks to look at, and at least 1/2 of > them take more than a single input. > > In particular, you may want to look at the code for > gr_add_vff.{h,cc} which adds streams of vectors of floats together and > gr_add_ff.{h,cc} which adds streams of floats together. > > </pendantic> > > Eric > _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
