GNU Radio 3.6.3.1 C++ API
int.h
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1 /* Include file to configure the RS codec for integer symbols
2  *
3  * Copyright 2002, Phil Karn, KA9Q
4  * May be used under the terms of the GNU General Public License (GPL)
5  */
6 #define DTYPE int
7 
8 #include <gr_core_api.h>
9 
10 /* Reed-Solomon codec control block */
11 struct GR_CORE_API rs {
12  unsigned int mm; /* Bits per symbol */
13  unsigned int nn; /* Symbols per block (= (1<<mm)-1) */
14  int *alpha_to; /* log lookup table */
15  int *index_of; /* Antilog lookup table */
16  int *genpoly; /* Generator polynomial */
17  unsigned int nroots; /* Number of generator roots = number of parity symbols */
18  unsigned int fcr; /* First consecutive root, index form */
19  unsigned int prim; /* Primitive element, index form */
20  unsigned int iprim; /* prim-th root of 1, index form */
21 };
22 
23 static inline int modnn(struct rs *rs,int x){
24  while (x >= rs->nn) {
25  x -= rs->nn;
26  x = (x >> rs->mm) + (x & rs->nn);
27  }
28  return x;
29 }
30 #define MODNN(x) modnn(rs,x)
31 
32 #define MM (rs->mm)
33 #define NN (rs->nn)
34 #define ALPHA_TO (rs->alpha_to)
35 #define INDEX_OF (rs->index_of)
36 #define GENPOLY (rs->genpoly)
37 #define NROOTS (rs->nroots)
38 #define FCR (rs->fcr)
39 #define PRIM (rs->prim)
40 #define IPRIM (rs->iprim)
41 #define A0 (NN)
42 
43 #define ENCODE_RS encode_rs_int
44 #define DECODE_RS decode_rs_int
45 #define INIT_RS init_rs_int
46 #define FREE_RS free_rs_int
47 
48 GR_CORE_API void ENCODE_RS(void *p,DTYPE *data,DTYPE *parity);
49 GR_CORE_API int DECODE_RS(void *p,DTYPE *data,int *eras_pos,int no_eras);
50 void *INIT_RS(unsigned int symsize,unsigned int gfpoly,unsigned int fcr,
51  unsigned int prim,unsigned int nroots);
52 GR_CORE_API void FREE_RS(void *p);
53 
54 
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