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