1 /* Switch to K=9 r=1/3 Viterbi decoder with optional Intel or PowerPC SIMD
2 * Copyright Aug 2006, Phil Karn, KA9Q
3 */
4 #include <stdio.h>
5 #include <stdlib.h>
6 #include <memory.h>
7 #include "fec.h"
8
9 /* Create a new instance of a Viterbi decoder */
create_viterbi39(int len)10 void *create_viterbi39(int len){
11 find_cpu_mode();
12
13 switch(Cpu_mode){
14 case PORT:
15 default:
16 return create_viterbi39_port(len);
17 #ifdef __VEC__
18 case ALTIVEC:
19 return create_viterbi39_av(len);
20 #endif
21 #ifdef __i386__
22 case MMX:
23 return create_viterbi39_mmx(len);
24 case SSE:
25 return create_viterbi39_sse(len);
26 case SSE2:
27 return create_viterbi39_sse2(len);
28 #endif
29 }
30 }
31
set_viterbi39_polynomial(int polys[3])32 void set_viterbi39_polynomial(int polys[3]){
33 switch(Cpu_mode){
34 case PORT:
35 default:
36 set_viterbi39_polynomial_port(polys);
37 break;
38 #ifdef __VEC__
39 case ALTIVEC:
40 set_viterbi39_polynomial_av(polys);
41 break;
42 #endif
43 #ifdef __i386__
44 case MMX:
45 set_viterbi39_polynomial_mmx(polys);
46 break;
47 case SSE:
48 set_viterbi39_polynomial_sse(polys);
49 break;
50 case SSE2:
51 set_viterbi39_polynomial_sse2(polys);
52 break;
53 #endif
54 }
55 }
56
57
58 /* Initialize Viterbi decoder for start of new frame */
init_viterbi39(void * p,int starting_state)59 int init_viterbi39(void *p,int starting_state){
60 switch(Cpu_mode){
61 case PORT:
62 default:
63 return init_viterbi39_port(p,starting_state);
64 #ifdef __VEC__
65 case ALTIVEC:
66 return init_viterbi39_av(p,starting_state);
67 #endif
68 #ifdef __i386__
69 case MMX:
70 return init_viterbi39_mmx(p,starting_state);
71 case SSE:
72 return init_viterbi39_sse(p,starting_state);
73 case SSE2:
74 return init_viterbi39_sse2(p,starting_state);
75 #endif
76 }
77 }
78
79 /* Viterbi chainback */
chainback_viterbi39(void * p,unsigned char * data,unsigned int nbits,unsigned int endstate)80 int chainback_viterbi39(
81 void *p,
82 unsigned char *data, /* Decoded output data */
83 unsigned int nbits, /* Number of data bits */
84 unsigned int endstate){ /* Terminal encoder state */
85
86 switch(Cpu_mode){
87 case PORT:
88 default:
89 return chainback_viterbi39_port(p,data,nbits,endstate);
90 #ifdef __VEC__
91 case ALTIVEC:
92 return chainback_viterbi39_av(p,data,nbits,endstate);
93 #endif
94 #ifdef __i386__
95 case MMX:
96 return chainback_viterbi39_mmx(p,data,nbits,endstate);
97 case SSE:
98 return chainback_viterbi39_sse(p,data,nbits,endstate);
99 case SSE2:
100 return chainback_viterbi39_sse2(p,data,nbits,endstate);
101 #endif
102 }
103 }
104
105 /* Delete instance of a Viterbi decoder */
delete_viterbi39(void * p)106 void delete_viterbi39(void *p){
107 switch(Cpu_mode){
108 case PORT:
109 default:
110 delete_viterbi39_port(p);
111 break;
112 #ifdef __VEC__
113 case ALTIVEC:
114 delete_viterbi39_av(p);
115 break;
116 #endif
117 #ifdef __i386__
118 case MMX:
119 delete_viterbi39_mmx(p);
120 break;
121 case SSE:
122 delete_viterbi39_sse(p);
123 break;
124 case SSE2:
125 delete_viterbi39_sse2(p);
126 break;
127 #endif
128 }
129 }
130
131 /* Update decoder with a block of demodulated symbols
132 * Note that nbits is the number of decoded data bits, not the number
133 * of symbols!
134 */
update_viterbi39_blk(void * p,unsigned char syms[],int nbits)135 int update_viterbi39_blk(void *p,unsigned char syms[],int nbits){
136 switch(Cpu_mode){
137 case PORT:
138 default:
139 return update_viterbi39_blk_port(p,syms,nbits);
140 #ifdef __VEC__
141 case ALTIVEC:
142 return update_viterbi39_blk_av(p,syms,nbits);
143 #endif
144 #ifdef __i386__
145 case MMX:
146 return update_viterbi39_blk_mmx(p,syms,nbits);
147 case SSE:
148 return update_viterbi39_blk_sse(p,syms,nbits);
149 case SSE2:
150 return update_viterbi39_blk_sse2(p,syms,nbits);
151 #endif
152 }
153 }
154