Bill Yi | 4e213d5 | 2015-06-23 13:53:11 -0700 | [diff] [blame] | 1 | /* K=7 r=1/2 Viterbi decoder with optional Intel or PowerPC SIMD |
| 2 | * Copyright Feb 2004, 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 */ |
| 10 | void *create_viterbi27(int len){ |
| 11 | find_cpu_mode(); |
| 12 | |
| 13 | switch(Cpu_mode){ |
| 14 | case PORT: |
| 15 | default: |
| 16 | return create_viterbi27_port(len); |
| 17 | #ifdef __VEC__ |
| 18 | case ALTIVEC: |
| 19 | return create_viterbi27_av(len); |
| 20 | #endif |
| 21 | #ifdef __i386__ |
| 22 | case MMX: |
| 23 | return create_viterbi27_mmx(len); |
| 24 | case SSE: |
| 25 | return create_viterbi27_sse(len); |
| 26 | case SSE2: |
| 27 | return create_viterbi27_sse2(len); |
| 28 | #endif |
| 29 | } |
| 30 | } |
| 31 | |
| 32 | void set_viterbi27_polynomial(int polys[2]){ |
| 33 | switch(Cpu_mode){ |
| 34 | case PORT: |
| 35 | default: |
| 36 | set_viterbi27_polynomial_port(polys); |
| 37 | break; |
| 38 | #ifdef __VEC__ |
| 39 | case ALTIVEC: |
| 40 | set_viterbi27_polynomial_av(polys); |
| 41 | break; |
| 42 | #endif |
| 43 | #ifdef __i386__ |
| 44 | case MMX: |
| 45 | set_viterbi27_polynomial_mmx(polys); |
| 46 | break; |
| 47 | case SSE: |
| 48 | set_viterbi27_polynomial_sse(polys); |
| 49 | break; |
| 50 | case SSE2: |
| 51 | set_viterbi27_polynomial_sse2(polys); |
| 52 | break; |
| 53 | #endif |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | /* Initialize Viterbi decoder for start of new frame */ |
| 58 | int init_viterbi27(void *p,int starting_state){ |
| 59 | switch(Cpu_mode){ |
| 60 | case PORT: |
| 61 | default: |
| 62 | return init_viterbi27_port(p,starting_state); |
| 63 | #ifdef __VEC__ |
| 64 | case ALTIVEC: |
| 65 | return init_viterbi27_av(p,starting_state); |
| 66 | #endif |
| 67 | #ifdef __i386__ |
| 68 | case MMX: |
| 69 | return init_viterbi27_mmx(p,starting_state); |
| 70 | case SSE: |
| 71 | return init_viterbi27_sse(p,starting_state); |
| 72 | case SSE2: |
| 73 | return init_viterbi27_sse2(p,starting_state); |
| 74 | #endif |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | /* Viterbi chainback */ |
| 79 | int chainback_viterbi27( |
| 80 | void *p, |
| 81 | unsigned char *data, /* Decoded output data */ |
| 82 | unsigned int nbits, /* Number of data bits */ |
| 83 | unsigned int endstate){ /* Terminal encoder state */ |
| 84 | |
| 85 | switch(Cpu_mode){ |
| 86 | case PORT: |
| 87 | default: |
| 88 | return chainback_viterbi27_port(p,data,nbits,endstate); |
| 89 | #ifdef __VEC__ |
| 90 | case ALTIVEC: |
| 91 | return chainback_viterbi27_av(p,data,nbits,endstate); |
| 92 | #endif |
| 93 | #ifdef __i386__ |
| 94 | case MMX: |
| 95 | return chainback_viterbi27_mmx(p,data,nbits,endstate); |
| 96 | case SSE: |
| 97 | return chainback_viterbi27_sse(p,data,nbits,endstate); |
| 98 | case SSE2: |
| 99 | return chainback_viterbi27_sse2(p,data,nbits,endstate); |
| 100 | #endif |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | /* Delete instance of a Viterbi decoder */ |
| 105 | void delete_viterbi27(void *p){ |
| 106 | switch(Cpu_mode){ |
| 107 | case PORT: |
| 108 | default: |
| 109 | delete_viterbi27_port(p); |
| 110 | break; |
| 111 | #ifdef __VEC__ |
| 112 | case ALTIVEC: |
| 113 | delete_viterbi27_av(p); |
| 114 | break; |
| 115 | #endif |
| 116 | #ifdef __i386__ |
| 117 | case MMX: |
| 118 | delete_viterbi27_mmx(p); |
| 119 | break; |
| 120 | case SSE: |
| 121 | delete_viterbi27_sse(p); |
| 122 | break; |
| 123 | case SSE2: |
| 124 | delete_viterbi27_sse2(p); |
| 125 | break; |
| 126 | #endif |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | /* Update decoder with a block of demodulated symbols |
| 131 | * Note that nbits is the number of decoded data bits, not the number |
| 132 | * of symbols! |
| 133 | */ |
| 134 | int update_viterbi27_blk(void *p,unsigned char syms[],int nbits){ |
| 135 | if(p == NULL) |
| 136 | return -1; |
| 137 | |
| 138 | switch(Cpu_mode){ |
| 139 | case PORT: |
| 140 | default: |
| 141 | update_viterbi27_blk_port(p,syms,nbits); |
| 142 | break; |
| 143 | #ifdef __VEC__ |
| 144 | case ALTIVEC: |
| 145 | update_viterbi27_blk_av(p,syms,nbits); |
| 146 | break; |
| 147 | #endif |
| 148 | #ifdef __i386__ |
| 149 | case MMX: |
| 150 | update_viterbi27_blk_mmx(p,syms,nbits); |
| 151 | break; |
| 152 | case SSE: |
| 153 | update_viterbi27_blk_sse(p,syms,nbits); |
| 154 | break; |
| 155 | case SSE2: |
| 156 | update_viterbi27_blk_sse2(p,syms,nbits); |
| 157 | break; |
| 158 | #endif |
| 159 | } |
| 160 | return 0; |
| 161 | } |