GNU Radio 3.4.0 C++ API
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00001 /* -*- c++ -*- */ 00002 /* 00003 * Copyright 2005 Free Software Foundation, Inc. 00004 * 00005 * This file is part of GNU Radio 00006 * 00007 * GNU Radio is free software; you can redistribute it and/or modify 00008 * it under the terms of the GNU General Public License as published by 00009 * the Free Software Foundation; either version 3, or (at your option) 00010 * any later version. 00011 * 00012 * GNU Radio is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 * GNU General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU General Public License 00018 * along with GNU Radio; see the file COPYING. If not, write to 00019 * the Free Software Foundation, Inc., 51 Franklin Street, 00020 * Boston, MA 02110-1301, USA. 00021 */ 00022 00023 #ifndef INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H 00024 #define INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H 00025 00026 #include <gr_block.h> 00027 00028 /*! 00029 * \brief align several complex short (interleaved short) input channels with corresponding unsigned 32 bit sample_counters (provided as interleaved 16 bit values) 00030 * \ingroup misc 00031 * \param number of complex_short input channels (including the 32 bit counting channel) 00032 * \param align_interval is after how much samples (minimally) the sample-alignement is refreshed. Default is 128. 00033 * A bigger value means less processing power but also requests more buffer space, which has a maximum. 00034 * Decrease the align_interval if you get an error like: 00035 * "sched: <gr_block align_on_samplenumbers_ss (0)> is requesting more input data than we can provide. 00036 * ninput_items_required = 32768 00037 * max_possible_items_available = 16383 00038 * If this is a filter, consider reducing the number of taps." 00039 * \ingroup block 00040 * Pay attention on how you connect this block. 00041 * It expects a minimum of 2 usrp_source_s with nchan number of channels and FPGA_MODE_COUNTING_32BIT enabled. 00042 * This means that the first complex_short channel on every input is an interleaved 32 bit counter. 00043 * The samples are aligned by dropping samples untill the samplenumbers match. 00044 */ 00045 class gr_align_on_samplenumbers_ss; 00046 typedef boost::shared_ptr<gr_align_on_samplenumbers_ss> gr_align_on_samplenumbers_ss_sptr; 00047 00048 gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan=2, int align_interval=128); 00049 00050 00051 00052 00053 class gr_align_on_samplenumbers_ss : public gr_block 00054 { 00055 int d_align_interval; 00056 int d_sample_counter; 00057 int d_nchan; 00058 bool d_in_presync; 00059 unsigned int d_ninputs; 00060 class align_state { 00061 public: 00062 unsigned int ucounter_end; 00063 unsigned int ucounter_begin; 00064 int diff; 00065 int diff_comp; 00066 int diff_end; 00067 int diff_comp_end; 00068 bool sync_found; 00069 bool sync_end_found; 00070 int ninput_items; 00071 int ninput_items_used; 00072 }; 00073 std::vector<align_state> d_state; 00074 00075 friend gr_align_on_samplenumbers_ss_sptr gr_make_align_on_samplenumbers_ss (int nchan,int align_interval); 00076 gr_align_on_samplenumbers_ss (int nchan,int align_interval); 00077 00078 public: 00079 ~gr_align_on_samplenumbers_ss(); 00080 bool check_topology (int ninputs, int noutputs); 00081 void forecast (int noutput_items, 00082 gr_vector_int &ninput_items_required); 00083 00084 int general_work (int noutput_items, 00085 gr_vector_int &ninput_items, 00086 gr_vector_const_void_star &input_items, 00087 gr_vector_void_star &output_items); 00088 }; 00089 00090 00091 #endif /* INCLUDED_GR_ALIGN_ON_SAMPLE_NUMBERS_SS_H */