1 /* -*- c++ -*- */
2 /*
3  * Copyright 2015 Free Software Foundation, Inc.
4  *
5  * This file is part of GNU Radio
6  *
7  * GNU Radio is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 3, or (at your option)
10  * any later version.
11  *
12  * GNU Radio is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  * GNU General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with GNU Radio; see the file COPYING.  If not, write to
19  * the Free Software Foundation, Inc., 51 Franklin Street,
20  * Boston, MA 02110-1301, USA.
21  */
22 
23 #ifndef INCLUDED_LDPC_DECODER_H
24 #define INCLUDED_LDPC_DECODER_H
25 
26 typedef float INPUT_DATATYPE;
27 typedef unsigned char OUTPUT_DATATYPE;
28 
29 #include <gnuradio/fec/decoder.h>
30 #include <map>
31 #include <string>
32 #include <vector>
33 
34 #include <gnuradio/fec/alist.h>
35 #include <gnuradio/fec/awgn_bp.h>
36 #include <gnuradio/fec/cldpc.h>
37 
38 namespace gr {
39 namespace fec {
40 
41 
42 #define MAXLOG 1e7
43 
44 class FEC_API ldpc_decoder : public generic_decoder
45 {
46 private:
47     // private constructor
48     ldpc_decoder(std::string alist_file, float sigma, int max_iterations);
49 
50     // plug into the generic fec api
51     int get_history();
52     float get_shift();
53     const char* get_conversion();
54     void generic_work(void* inBuffer, void* outbuffer);
55     float d_iterations;
56     int d_input_size, d_output_size;
57     double d_rate;
58 
59     alist d_list;
60     cldpc d_code;
61     awgn_bp d_spa;
62 
63 public:
64     ~ldpc_decoder();
65 
66     double rate();
67     bool set_frame_size(unsigned int frame_size);
68 
69     static generic_decoder::sptr
70     make(std::string alist_file, float sigma = 0.5, int max_iterations = 50);
71 
72     int get_output_size();
73     int get_input_size();
74     int get_input_item_size();
75     int get_output_item_size();
get_iterations()76     float get_iterations() { return d_iterations; }
77 };
78 
79 } // namespace fec
80 } // namespace gr
81 
82 #endif /* INCLUDED_LDPC_DECODER_H */
83