specifics.c

linux下将各类格式图片转换工具

      bnum = atoi(lp);
      SkipToSpace(lp);
      while ((*lp != '-') && (*lp != '+') &&
	     ((*lp < '0') || (*lp > '9'))) lp++;
      relative = ((*lp == '-') || (*lp == '+'));
      newqs = atoi(lp);
      SkipToSpace(lp);
      if (EndString(lp)) {
	num_scanned = 2;
      } else {
	num_scanned = 2+sscanf(lp, "%s %d %d %d %d", kind, &fx, &fy, &sx, &sy); 
      }

      qs = newqs;
      new_blk = AddBs(current, bnum, relative, qs);
      if (num_scanned > 2) {
	BlockMV *tmp;
	tmp = (BlockMV *) malloc(sizeof(BlockMV));
	switch (num_scanned) {
	case 7:
	  tmp->typ = TYP_BOTH;
	  tmp->fx = fx;
	  tmp->fy = fy;
	  tmp->bx = sx;
	  tmp->by = sy;
	  new_blk->mv = tmp;
	  break;
	case 3:
	  tmp->typ = TYP_SKIP;
	  new_blk->mv = tmp;
	  break;
	case 5:
	  if (my_upper(kind[0]) == 'B') {
	    tmp->typ = TYP_BACK;
	    tmp->bx = fx;
	    tmp->by = fy;
	  } else {
	    tmp->typ = TYP_FORW;
	    tmp->fx = fx;
	    tmp->fy = fy;
	  }
	  new_blk->mv = tmp;
	  break;
	default:
	  fprintf(stderr,
		  "Bug in specifics file!  Skipping short/long entry: %s\n",line);
	  break;
	}
      } else {
	new_blk->mv = (BlockMV *) NULL;
      }

      break;
    case 'V':
      fprintf(stderr,
	      "Cannot specify version twice!  Taking first (%d).\n",
	      version);
      break;
    default:
      printf("What? *%s*\n",line);
      break;
    }}
  
}




/*=================================================================
 *
 *     MakeFslEntry
 *
 *     Makes a single entry in for the fsl linked list (makes a frame)
 *
 *     Returns: the new entry
 *
 *     Modifies: nothing
 *
 *=================================================================
 */
FrameSpecList *MakeFslEntry()
{
  FrameSpecList *fslp;
  fslp = (FrameSpecList *) malloc(sizeof(FrameSpecList));
  fslp->framenum = -1;
  fslp->slc = (Slice_Specifics *) NULL;
  fslp->bs = (Block_Specifics *) NULL;
  return fslp;
}





/*================================================================
 *
 *   AddSlc
 *
 *   Adds a slice to framespeclist c with values snum and qs
 *
 *   Returns: nothing
 *
 *   Modifies: fsl's structure
 *
 *================================================================
 */
void AddSlc(c, snum, qs)
FrameSpecList *c;
int snum,qs;
{
  Slice_Specifics *new;
  static Slice_Specifics *last;

  new = (Slice_Specifics *) malloc(sizeof(Slice_Specifics));
  new->num = snum;
  new->qscale = qs;
  new->next = (Slice_Specifics *)NULL;
  if (c->slc == (Slice_Specifics *)NULL) {
    last = new;
    c->slc = new;
  } else {
    last->next = new;
    last = new;
  }
}





/*================================================================
 *
 *   AddBs
 *
 *   Adds a sliceblock to framespeclist c with values bnum and qs
 *
 *   Returns: pointer to the new block spec
 *
 *   Modifies: fsl's structure
 *
 *================================================================
 */
Block_Specifics *AddBs(c,bnum,rel,qs)
FrameSpecList *c;
boolean rel;
int bnum,qs;
{
  Block_Specifics *new;
  static Block_Specifics *last;

  new = (Block_Specifics *) malloc(sizeof(Block_Specifics));
  new->num = bnum;
  if (qs == 0) rel = TRUE;
  new->relative = rel;
  new->qscale = qs;
  new->next = (Block_Specifics *)NULL;
  new->mv = (BlockMV *) NULL;
  if (c->bs == (Block_Specifics *)NULL) {
    last = new;
    c->bs = new;
  } else {
    last->next = new;
    last = new;
  }
  return new;
}






/*================================================================
 *
 *  SpecLookup
 *
 *  Find out if there is any changes to be made for the qscale
 *  at entry fn.num (which is of type typ).  Sets info to point to
 *  motion vector info (if any), else NULL.
 *
 *  Returns: new qscale or -1
 *
 *  Modifies: *info (well, internal cache can change)
 *
 *================================================================
 */

int SpecLookup(fn,typ,num,info,start_qs)
int fn,typ,num;
BlockMV **info;
int start_qs;
{
  static FrameSpecList *last = (FrameSpecList *) NULL;
  Slice_Specifics *sptr=(Slice_Specifics *) NULL;
  Block_Specifics *bptr=(Block_Specifics *) NULL;
  FrameSpecList *tmp;
  boolean found_it;
  static int leftovers = 0;  /* Used in case of forced movement into 1..31 range */
  
  *info = (BlockMV * )NULL;
  if (last == (FrameSpecList *) NULL){
    /* No cache, try to find number fn */
    tmp = fsl;
    found_it = FALSE;
    while (tmp != (FrameSpecList *) NULL) {
      if (tmp->framenum == fn) {
	found_it = TRUE;
	break;
      } else tmp = tmp->next;
    }
    if (!found_it) return -1;
    last=tmp;
  } else {
    if (last->framenum != fn) { /* cache miss! */
      /* first check if it is next */
      if ((last->next != (FrameSpecList *) NULL) && 
	  (last->next->framenum == fn)) {
	last = last->next;
      } else {
	/* if not next, check from the start.
	   (this allows people to put frames out of order,even
	   though the spec doesnt allow it.) */
	tmp = fsl;
	found_it = FALSE;
	while (tmp != (FrameSpecList *) NULL) {
	  if (tmp->framenum==fn) {found_it = TRUE; break;}
	  tmp = tmp->next;
	}
	if (!found_it) return -1;
	last = tmp;
      }
    }
  }
  /* neither of these should ever be true, unless there is a bug above */
  if (last == (FrameSpecList *) NULL) {
    fprintf(stderr, "PROGRAMMER ERROR: last is null!\n");
    return -1;
  }
  if (last->framenum!=fn) {
    fprintf(stderr, "PROGRAMMER ERROR: last has wrong number!\n");
    return -1; /* no data on it */
  }
  
  switch(typ) {
  case 0: /* Frame: num is ignored */
    leftovers = 0;
#ifdef BLEAH
    printf("QSchange frame %d to %d\n", fn, last->qscale);
#endif 
    return last->qscale;
    break;

  case 1: /* Slice */
    leftovers = 0;
    /* So, any data on slices? */
    if (last->slc == (Slice_Specifics *) NULL) return -1;
    for (sptr = last->slc; sptr != (Slice_Specifics *) NULL; sptr = sptr->next) {
      if (sptr->num == num) {
#ifdef BLEAH
	printf("QSchange Slice %d.%d to %d\n", fn, num, sptr->qscale);
#endif
	if (sptr->qscale == 0) return -1;
	return sptr->qscale;
      }
    }
    break;

  case 2:  /* block */
    /* So, any data on blocks? */
    if (last->bs == (Block_Specifics *) NULL) {
      return -1;
    }
    for (bptr=last->bs; bptr != (Block_Specifics *) NULL; bptr=bptr->next) {
      if (bptr->num == num) {
	int new_one;
#ifdef BLEAH
	printf("QSchange Block %d.%d to %d\n", fn, num, bptr->qscale);
#endif
	*info = bptr->mv;
	if (bptr->relative) {
	  if (bptr->qscale == 0) {
	    /* Do nothing! */
	    new_one = start_qs;
	  } else {
	    new_one = start_qs + bptr->qscale + leftovers;
	    if (new_one < 1) {
	      leftovers = new_one - 1;
	      new_one = 1;
	    } else if (new_one > 31) {
	      leftovers = new_one - 31;
	      new_one = 31;
	    } else leftovers = 0;
	  }}
	else {
	  new_one = bptr->qscale;
	  leftovers = 0;
	}
	return new_one;
      }
    }
    break;
  default:
    fprintf(stderr, "PROGRAMMER ERROR:  reached unreachable code in SpecLookup\n");
    break;
  }
  /* no luck */
  return -1;
}
     
    
/*================================================================
 *
 *  SpecTypeLookup
 *
 *  Find out if there is any changes to be made for the type of frame
 *  at frame fn.
 *
 *  Returns: new type or -1 (unspecified)
 *
 *================================================================
 */
int SpecTypeLookup(fn)
int fn;
{
  FrameSpecList *tmp;

  /* try to find number fn */
  tmp = fsl;
  do {
    if (tmp->framenum == fn) break;
    else tmp = tmp->next;
  } while (tmp != (FrameSpecList *) NULL);
  if (tmp == (FrameSpecList *) NULL) {
#ifdef BLEAH
    printf("Frame %d type not specified\n", fn);
#endif
    return -1;
  }
#ifdef BLEAH
  printf("Frame %d type set to %d\n", fn, tmp->frametype);
#endif
  return tmp->frametype;
}