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Adjust SAO mode coding cost for zero offsets.

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- Coding zero with TR only takes one bit.

- Even though offset 0 should be fairly common, this doesn't seem to help very
  much and actually increases bdrate on some sequences.
This commit is contained in:
Ari Koivula 2014-04-15 14:40:33 +03:00
parent 67a3d5542c
commit 9ff32c566c
1 changed files with 8 additions and 6 deletions
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14
src/sao.c
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@ -148,9 +148,10 @@ static int sao_mode_bits_edge(int edge_class, int offsets[NUM_SAO_EDGE_CATEGORIE
sao_eo_cat edge_cat;
for (edge_cat = SAO_EO_CAT1; edge_cat <= SAO_EO_CAT4; ++edge_cat) {
int abs_offset = abs(offsets[edge_cat]);
mode_bits += 2 + abs_offset;
if (abs_offset == SAO_ABS_OFFSET_MAX) {
mode_bits -= 1;
if (abs_offset == 0 || abs_offset == SAO_ABS_OFFSET_MAX) {
mode_bits += abs_offset + 1;
} else {
mode_bits += abs_offset + 2;
}
}
}
@ -171,9 +172,10 @@ static int sao_mode_bits_band(int band_position, int offsets[NUM_SAO_EDGE_CATEGO
sao_eo_cat edge_cat;
for (edge_cat = SAO_EO_CAT1; edge_cat <= SAO_EO_CAT4; ++edge_cat) {
int abs_offset = abs(offsets[edge_cat]);
mode_bits += 2 + abs_offset;
if (abs_offset == SAO_ABS_OFFSET_MAX) {
mode_bits -= 1;
if (abs_offset == 0 || abs_offset == SAO_ABS_OFFSET_MAX) {
mode_bits += abs_offset + 1;
} else {
mode_bits += abs_offset + 2;
}
}
}