- /* Iterate until the delta constraints between each groups are
- satisfyed. I'm sure it is possible to find a better algorithm,
- but I am lazy */
- do {
- recurse = 0;
- for(i=1;i<=nb_groups;i++) {
- delta = exp1[i] - exp1[i-1];
- if (delta > 2) {
- /* if delta too big, we encode a smaller exponent */
- exp1[i] = exp1[i-1] + 2;
- } else if (delta < -2) {
- /* if delta is too small, we must decrease the previous
- exponent, which means we must recurse */
- recurse = 1;
- exp1[i-1] = exp1[i] + 2;
- }
- }
- } while (recurse);
-
+ /* Decrease the delta between each groups to within 2
+ * so that they can be differentially encoded */
+ for (i=1;i<=nb_groups;i++)
+ exp1[i] = FFMIN(exp1[i], exp1[i-1] + 2);
+ for (i=nb_groups-1;i>=0;i--)
+ exp1[i] = FFMIN(exp1[i], exp1[i+1] + 2);
+