errorconcealment.c

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#include "contributors.h"
#include "global.h"
#include "elements.h"

static int ec_flag[SE_MAX_ELEMENTS];        
/*
static char SEtypes[][25] =
{
    "SE_HEADER",
    "SE_PTYPE",
    "SE_MBTYPE",
    "SE_REFFRAME",
    "SE_INTRAPREDMODE",
    "SE_MVD",
    "SE_CBP_INTRA",
    "SE_LUM_DC_INTRA",
    "SE_CHR_DC_INTRA",
    "SE_LUM_AC_INTRA",
    "SE_CHR_AC_INTRA",
    "SE_CBP_INTER",
    "SE_LUM_DC_INTER",
    "SE_CHR_DC_INTER",
    "SE_LUM_AC_INTER",
    "SE_CHR_AC_INTER",
    "SE_DELTA_QUANT_INTER",
    "SE_DELTA_QUANT_INTRA",
    "SE_BFRAME",
    "SE_EOS"
};
*/

int set_ec_flag(
  int se)   
{

  /*
  if (ec_flag[se] == NO_EC)
    printf("Error concealment on element %s\n",SEtypes[se]);
  */
  switch (se)
  {
  case SE_HEADER :
    ec_flag[SE_HEADER] = EC_REQ;
  case SE_PTYPE :
    ec_flag[SE_PTYPE] = EC_REQ;
  case SE_MBTYPE :
    ec_flag[SE_MBTYPE] = EC_REQ;

  case SE_REFFRAME :
    ec_flag[SE_REFFRAME] = EC_REQ;
    ec_flag[SE_MVD] = EC_REQ; // set all motion vectors to zero length
    se = SE_CBP_INTER;      // conceal also Inter texture elements
    break;

  case SE_INTRAPREDMODE :
    ec_flag[SE_INTRAPREDMODE] = EC_REQ;
    se = SE_CBP_INTRA;      // conceal also Intra texture elements
    break;
  case SE_MVD :
    ec_flag[SE_MVD] = EC_REQ;
    se = SE_CBP_INTER;      // conceal also Inter texture elements
    break;

  default:
    break;
  }

  switch (se)
  {
  case SE_CBP_INTRA :
    ec_flag[SE_CBP_INTRA] = EC_REQ;
  case SE_LUM_DC_INTRA :
    ec_flag[SE_LUM_DC_INTRA] = EC_REQ;
  case SE_CHR_DC_INTRA :
    ec_flag[SE_CHR_DC_INTRA] = EC_REQ;
  case SE_LUM_AC_INTRA :
    ec_flag[SE_LUM_AC_INTRA] = EC_REQ;
  case SE_CHR_AC_INTRA :
    ec_flag[SE_CHR_AC_INTRA] = EC_REQ;
    break;

  case SE_CBP_INTER :
    ec_flag[SE_CBP_INTER] = EC_REQ;
  case SE_LUM_DC_INTER :
    ec_flag[SE_LUM_DC_INTER] = EC_REQ;
  case SE_CHR_DC_INTER :
    ec_flag[SE_CHR_DC_INTER] = EC_REQ;
  case SE_LUM_AC_INTER :
    ec_flag[SE_LUM_AC_INTER] = EC_REQ;
  case SE_CHR_AC_INTER :
    ec_flag[SE_CHR_AC_INTER] = EC_REQ;
    break;
  case SE_DELTA_QUANT_INTER :
    ec_flag[SE_DELTA_QUANT_INTER] = EC_REQ;
    break;
  case SE_DELTA_QUANT_INTRA :
    ec_flag[SE_DELTA_QUANT_INTRA] = EC_REQ;
    break;
  default:
    break;

  }
  return EC_REQ;
}

void reset_ec_flags()
{
  int i;
  for (i=0; i<SE_MAX_ELEMENTS; i++)
    ec_flag[i] = NO_EC;
}


int get_concealed_element(SyntaxElement *sym)
{
  if (ec_flag[sym->type] == NO_EC)
    return NO_EC;
/*
#if TRACE
  printf("TRACE: get concealed element for %s!!!\n", SEtypes[sym->type]);
#endif
*/
  switch (sym->type)
  {
  case SE_HEADER :
    sym->len = 31;
    sym->inf = 0; // Picture Header
    break;

  case SE_PTYPE : // inter_img_1
  case SE_MBTYPE : // set COPY_MB
  case SE_REFFRAME :
    sym->len = 1;
    sym->inf = 0;
    break;

  case SE_INTRAPREDMODE :
  case SE_MVD :
    sym->len = 1;
    sym->inf = 0;  // set vector to zero length
    break;

  case SE_CBP_INTRA :
    sym->len = 5;
    sym->inf = 0; // codenumber 3 <=> no CBP information for INTRA images
    break;

  case SE_LUM_DC_INTRA :
  case SE_CHR_DC_INTRA :
  case SE_LUM_AC_INTRA :
  case SE_CHR_AC_INTRA :
    sym->len = 1;
    sym->inf = 0;  // return EOB
    break;

  case SE_CBP_INTER :
    sym->len = 1;
    sym->inf = 0; // codenumber 1 <=> no CBP information for INTER images
    break;

  case SE_LUM_DC_INTER :
  case SE_CHR_DC_INTER :
  case SE_LUM_AC_INTER :
  case SE_CHR_AC_INTER :
    sym->len = 1;
    sym->inf = 0;  // return EOB
    break;

  case SE_DELTA_QUANT_INTER:
    sym->len = 1;
    sym->inf = 0;
    break;
  case SE_DELTA_QUANT_INTRA:
    sym->len = 1;
    sym->inf = 0;
    break;
  default:
    break;
  }

  return EC_REQ;
}

---

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