125 lines
3.7 KiB
C++
125 lines
3.7 KiB
C++
/* -*- c++ -*- */
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/*
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* Copyright 2004 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef INCLUDED_REPEATER_P25_FRAME_H
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#define INCLUDED_REPEATER_P25_FRAME_H
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#include <gr_sync_block.h>
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#include <deque>
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class repeater_p25_frame_fb;
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/*
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* We use boost::shared_ptr's instead of raw pointers for all access
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* to gr_blocks (and many other data structures). The shared_ptr gets
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* us transparent reference counting, which greatly simplifies storage
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* management issues. This is especially helpful in our hybrid
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* C++ / Python system.
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*
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* See http://www.boost.org/libs/smart_ptr/smart_ptr.htm
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*
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* As a convention, the _sptr suffix indicates a boost::shared_ptr
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*/
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typedef boost::shared_ptr<repeater_p25_frame_fb> repeater_p25_frame_fb_sptr;
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typedef std::deque<uint8_t> dibit_queue;
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/*!
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* \brief Return a shared_ptr to a new instance of repeater_p25_frame_fb.
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*
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* To avoid accidental use of raw pointers, repeater_p25_frame_fb's
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* constructor is private. repeater_make_p25_frame_fb is the public
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* interface for creating new instances.
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*/
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repeater_p25_frame_fb_sptr repeater_make_p25_frame_fb ();
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/*!
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* \brief produce a stream of dibits, given a stream of floats in [-3,-1,1,3]
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* \ingroup block
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*
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* This uses the preferred technique: subclassing gr_sync_block.
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*/
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struct _stats_frame_history {
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uint32_t nac;
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time_t sec;
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suseconds_t usec;
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uint64_t frame_ctr;
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};
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static const int FRAME_HISTORY_SIZE=5;
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static const int MAX_NAC_LIST=5;
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class repeater_p25_frame_fb : public gr_block
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{
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private:
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// The friend declaration allows repeater_make_p25_frame_fb to
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// access the private constructor.
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friend repeater_p25_frame_fb_sptr repeater_make_p25_frame_fb ();
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repeater_p25_frame_fb (); // private constructor
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// internal functions
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typedef std::vector<bool> bit_vector;
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bool header_codeword(uint64_t acc, uint32_t& nac, uint32_t& duid);
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void rebuild_frame(bit_vector& frame_body) ;
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void proc_voice_unit(bit_vector& frame_body) ;
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void rx_sym(uint8_t dibit) ;
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void record_frame(uint32_t, uint32_t);
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// internal instance variables and state
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int reverse_p;
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int hdr_syms;
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uint32_t next_bit;
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uint64_t hdr_word;
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bit_vector frame_body;
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dibit_queue symbol_queue;
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int32_t surplus;
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uint64_t header_accum;
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uint32_t nac;
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uint32_t duid;
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uint32_t frame_size_limit;
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uint64_t last_sym_ct;
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uint32_t closed_nac_list[MAX_NAC_LIST];
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bool closed_repeater;
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// stats
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uint64_t stats_sym_ct;
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uint64_t stats_bad_bch;
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uint64_t stats_good_bch;
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uint64_t stats_bch_errs;
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uint64_t stats_e0_errs;
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uint64_t stats_et_errs;
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uint64_t stats_frames_received[16];
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struct _stats_frame_history stats_frame_history[FRAME_HISTORY_SIZE];
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public:
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~repeater_p25_frame_fb (); // public destructor
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// Where all the action really happens
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int general_work (int noutput_items,
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gr_vector_int &ninput_items,
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gr_vector_const_void_star &input_items,
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gr_vector_void_star &output_items);
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};
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#endif /* INCLUDED_REPEATER_P25_FRAME_H */
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