3 * Copyright 2005 Free Software Foundation, Inc.
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23 #ifndef INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H
24 #define INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H
29 * \brief align several complex short (interleaved short) input channels with corresponding unsigned 32 bit sample_counters (provided as interleaved 16 bit values)
31 * \param number of complex_short input channels (including the 32 bit counting channel)
32 * \param align_interval is after how much samples (minimally) the sample-alignement is refreshed. Default is 128.
33 * A bigger value means less processing power but also requests more buffer space, which has a maximum.
34 * Decrease the align_interval if you get an error like:
35 * "sched: <gr_block align_on_samplenumbers_ss (0)> is requesting more input data than we can provide.
36 * ninput_items_required = 32768
37 * max_possible_items_available = 16383
38 * If this is a filter, consider reducing the number of taps."
40 * Pay attention on how you connect this block.
41 * It expects a minimum of 2 usrp_source_s with nchan number of channels and FPGA_MODE_COUNTING_32BIT enabled.
42 * This means that the first complex_short channel on every input is an interleaved 32 bit counter.
43 * The samples are aligned by dropping samples untill the samplenumbers match.
45 class gr_align_on_samplenumbers_ss;
46 typedef boost::shared_ptr<gr_align_on_samplenumbers_ss> gr_align_on_samplenumbers_ss_sptr;
48 gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan=2, int align_interval=128);
53 class gr_align_on_samplenumbers_ss : public gr_block
59 unsigned int d_ninputs;
62 unsigned int ucounter_end;
63 unsigned int ucounter_begin;
71 int ninput_items_used;
73 std::vector<align_state> d_state;
75 friend gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan,int align_interval);
76 gr_align_on_samplenumbers_ss (int nchan,int align_interval);
79 ~gr_align_on_samplenumbers_ss();
80 bool check_topology (int ninputs, int noutputs);
81 void forecast (int noutput_items,
82 gr_vector_int &ninput_items_required);
84 int general_work (int noutput_items,
85 gr_vector_int &ninput_items,
86 gr_vector_const_void_star &input_items,
87 gr_vector_void_star &output_items);
91 #endif /* INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H */