On Tue, Jun 3, 2014 at 11:08 PM, Activecat <[email protected]> wrote:
> > Create a general block with two inputs and two outputs. > The two outputs connect to the USRP UHD sink. The first input connects to > the constantly transmitting source while the second input connects to the > non-consistent source. > > In your forecast function: > > ninput_items_required[0] = noutput_items; > ninput_items_required[1] = 0; > > > Then in your general_work function: > > const gr_complex *in0 = (const gr_complex*) input_items[0]; > const gr_complex *in1 = (const gr_complex*) input_items[1]; > gr_complex *out0 = (gr_complex*) output_items[0]; > gr_complex *out1 = (gr_complex*) output_items[1]; > > for (int i=0; i < noutput_items; i++) > out0[i] = in0[i]; > > for (int i=0; i < ninput_items[1]; i++) > out1[i] = in1[i] > > for (int i=ninput_items[1]; i < noutput_items; i++) > out1[i] = 0.0; // here you fill in the zeros, but won't > over-filled. > > consume( 0, noutput_items); > consume( 1, ninput_items[1]); > > return noutput_items; > > I've tested out above idea, it works. Its implementation source file is at https://github.com/activecat/gr-test2/blob/master/lib/streamer1_impl.cc To test it out, just run the flowgraph of https://github.com/activecat/gr-test2/blob/master/examples/flowgraph_09.grc https://github.com/activecat/gr-test2
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