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162 lines
3.4 KiB
162 lines
3.4 KiB
/* K=7 r=1/2 Viterbi decoder with optional Intel or PowerPC SIMD
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* Copyright Feb 2004, Phil Karn, KA9Q
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <memory.h>
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#include "fec.h"
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/* Create a new instance of a Viterbi decoder */
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void *create_viterbi27(int len){
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find_cpu_mode();
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switch(Cpu_mode){
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case PORT:
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default:
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return create_viterbi27_port(len);
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#ifdef __VEC__
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case ALTIVEC:
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return create_viterbi27_av(len);
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#endif
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#ifdef __i386__
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case MMX:
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return create_viterbi27_mmx(len);
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case SSE:
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return create_viterbi27_sse(len);
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case SSE2:
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return create_viterbi27_sse2(len);
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#endif
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}
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}
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void set_viterbi27_polynomial(int polys[2]){
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switch(Cpu_mode){
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case PORT:
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default:
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set_viterbi27_polynomial_port(polys);
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break;
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#ifdef __VEC__
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case ALTIVEC:
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set_viterbi27_polynomial_av(polys);
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break;
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#endif
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#ifdef __i386__
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case MMX:
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set_viterbi27_polynomial_mmx(polys);
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break;
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case SSE:
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set_viterbi27_polynomial_sse(polys);
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break;
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case SSE2:
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set_viterbi27_polynomial_sse2(polys);
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break;
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#endif
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}
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}
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/* Initialize Viterbi decoder for start of new frame */
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int init_viterbi27(void *p,int starting_state){
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switch(Cpu_mode){
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case PORT:
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default:
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return init_viterbi27_port(p,starting_state);
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#ifdef __VEC__
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case ALTIVEC:
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return init_viterbi27_av(p,starting_state);
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#endif
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#ifdef __i386__
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case MMX:
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return init_viterbi27_mmx(p,starting_state);
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case SSE:
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return init_viterbi27_sse(p,starting_state);
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case SSE2:
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return init_viterbi27_sse2(p,starting_state);
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#endif
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}
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}
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/* Viterbi chainback */
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int chainback_viterbi27(
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void *p,
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unsigned char *data, /* Decoded output data */
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unsigned int nbits, /* Number of data bits */
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unsigned int endstate){ /* Terminal encoder state */
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switch(Cpu_mode){
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case PORT:
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default:
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return chainback_viterbi27_port(p,data,nbits,endstate);
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#ifdef __VEC__
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case ALTIVEC:
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return chainback_viterbi27_av(p,data,nbits,endstate);
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#endif
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#ifdef __i386__
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case MMX:
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return chainback_viterbi27_mmx(p,data,nbits,endstate);
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case SSE:
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return chainback_viterbi27_sse(p,data,nbits,endstate);
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case SSE2:
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return chainback_viterbi27_sse2(p,data,nbits,endstate);
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#endif
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}
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}
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/* Delete instance of a Viterbi decoder */
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void delete_viterbi27(void *p){
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switch(Cpu_mode){
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case PORT:
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default:
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delete_viterbi27_port(p);
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break;
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#ifdef __VEC__
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case ALTIVEC:
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delete_viterbi27_av(p);
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break;
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#endif
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#ifdef __i386__
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case MMX:
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delete_viterbi27_mmx(p);
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break;
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case SSE:
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delete_viterbi27_sse(p);
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break;
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case SSE2:
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delete_viterbi27_sse2(p);
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break;
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#endif
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}
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}
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/* Update decoder with a block of demodulated symbols
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* Note that nbits is the number of decoded data bits, not the number
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* of symbols!
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*/
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int update_viterbi27_blk(void *p,unsigned char syms[],int nbits){
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if(p == NULL)
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return -1;
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switch(Cpu_mode){
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case PORT:
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default:
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update_viterbi27_blk_port(p,syms,nbits);
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break;
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#ifdef __VEC__
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case ALTIVEC:
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update_viterbi27_blk_av(p,syms,nbits);
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break;
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#endif
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#ifdef __i386__
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case MMX:
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update_viterbi27_blk_mmx(p,syms,nbits);
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break;
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case SSE:
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update_viterbi27_blk_sse(p,syms,nbits);
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break;
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case SSE2:
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update_viterbi27_blk_sse2(p,syms,nbits);
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break;
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#endif
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}
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return 0;
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}
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