gr-satnogs/lib/libfec/viterbi29.c

/* Switch to K=9 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_viterbi29(int len)
{
  find_cpu_mode();

  switch (Cpu_mode) {
  case PORT:
  default:
    return create_viterbi29_port(len);
#ifdef __VEC__
  case ALTIVEC:
    return create_viterbi29_av(len);
#endif
#ifdef __i386__
  case MMX:
    return create_viterbi29_mmx(len);
  case SSE:
    return create_viterbi29_sse(len);
  case SSE2:
    return create_viterbi29_sse2(len);
#endif
#ifdef __x86_64__
  case SSE2:
    return create_viterbi29_port(len);
#endif
  }
}

void set_viterbi29_polynomial(int polys[2])
{
  switch (Cpu_mode) {
  case PORT:
  default:
    set_viterbi29_polynomial_port(polys);
    break;
#ifdef __VEC__
  case ALTIVEC:
    set_viterbi29_polynomial_av(polys);
    break;
#endif
#ifdef __i386__
  case MMX:
    set_viterbi29_polynomial_mmx(polys);
    break;
  case SSE:
    set_viterbi29_polynomial_sse(polys);
    break;
  case SSE2:
    set_viterbi29_polynomial_sse2(polys);
    break;
#endif
#ifdef __x86_64__
  case SSE2:
    set_viterbi29_polynomial_port(polys);
    break;
#endif
  }
}

/* Initialize Viterbi decoder for start of new frame */
int init_viterbi29(void *p, int starting_state)
{
  switch (Cpu_mode) {
  case PORT:
  default:
    return init_viterbi29_port(p, starting_state);
#ifdef __VEC__
  case ALTIVEC:
    return init_viterbi29_av(p, starting_state);
#endif
#ifdef __i386__
  case MMX:
    return init_viterbi29_mmx(p, starting_state);
  case SSE:
    return init_viterbi29_sse(p, starting_state);
  case SSE2:
    return init_viterbi29_sse2(p, starting_state);
#endif
#ifdef __x86_64__
  case SSE2:
    return init_viterbi29_port(p, starting_state);
#endif
  }
}

/* Viterbi chainback */
int chainback_viterbi29(
  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_viterbi29_port(p, data, nbits, endstate);
#ifdef __VEC__
  case ALTIVEC:
    return chainback_viterbi29_av(p, data, nbits, endstate);
#endif
#ifdef __i386__
  case MMX:
    return chainback_viterbi29_mmx(p, data, nbits, endstate);
  case SSE:
    return chainback_viterbi29_sse(p, data, nbits, endstate);
  case SSE2:
    return chainback_viterbi29_sse2(p, data, nbits, endstate);
#endif
#ifdef __x86_64__
  case SSE2:
    return chainback_viterbi29_port(p, data, nbits, endstate);
#endif
  }
}

/* Delete instance of a Viterbi decoder */
void delete_viterbi29(void *p)
{
  switch (Cpu_mode) {
  case PORT:
  default:
    delete_viterbi29_port(p);
    break;
#ifdef __VEC__
  case ALTIVEC:
    delete_viterbi29_av(p);
    break;
#endif
#ifdef __i386__
  case MMX:
    delete_viterbi29_mmx(p);
    break;
  case SSE:
    delete_viterbi29_sse(p);
    break;
  case SSE2:
    delete_viterbi29_sse2(p);
    break;
#endif
#ifdef __x86_64__
  case SSE2:
    delete_viterbi29_port(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_viterbi29_blk(void *p, unsigned char syms[], int nbits)
{
  switch (Cpu_mode) {
  case PORT:
  default:
    return update_viterbi29_blk_port(p, syms, nbits);
#ifdef __VEC__
  case ALTIVEC:
    return update_viterbi29_blk_av(p, syms, nbits);
#endif
#ifdef __i386__
  case MMX:
    return update_viterbi29_blk_mmx(p, syms, nbits);
  case SSE:
    return update_viterbi29_blk_sse(p, syms, nbits);
  case SSE2:
    return update_viterbi29_blk_sse2(p, syms, nbits);
#endif
#ifdef __x86_64__
  case SSE2:
    return update_viterbi29_blk_port(p, syms, nbits);
#endif
  }
}