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Take into account the coding cost of not using SAO.

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This commit is contained in:
Ari Koivula 2014-04-15 16:39:51 +03:00
parent 880d09b27a
commit 33b9594fec
1 changed files with 37 additions and 4 deletions
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41
src/sao.c
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@ -121,13 +121,17 @@ static int sao_check_merge(const sao_info *sao_candidate, int type,
int band_position, int eo_class)
{
if (sao_candidate && sao_candidate->type == type) {
if (type == SAO_TYPE_NONE) {
return 1;
}
if (offsets[1] == sao_candidate->offsets[1] &&
offsets[2] == sao_candidate->offsets[2] &&
offsets[3] == sao_candidate->offsets[3] &&
offsets[4] == sao_candidate->offsets[4]) {
// Type must be BAND or EDGE
if ((type == SAO_TYPE_BAND && band_position == sao_candidate->band_position) ||
(type == SAO_TYPE_EDGE && eo_class == sao_candidate->eo_class)) {
(type == SAO_TYPE_EDGE && eo_class == sao_candidate->eo_class))
{
return 1;
}
}
@ -136,6 +140,31 @@ static int sao_check_merge(const sao_info *sao_candidate, int type,
}
static int sao_mode_bits_none(sao_info *sao_top, sao_info *sao_left)
{
int mode_bits = 0;
// FL coded merges.
if (sao_left != NULL) {
mode_bits += 1;
if (sao_check_merge(sao_left, SAO_TYPE_NONE, 0, 0, 0)) {
return mode_bits;
}
}
if (sao_top != NULL) {
mode_bits += 1;
if (sao_check_merge(sao_top, SAO_TYPE_NONE, 0, 0, 0)) {
return mode_bits;
}
}
// TR coded type_idx_, none = 0
mode_bits += 1;
return mode_bits;
}
static int sao_mode_bits_edge(int edge_class, int offsets[NUM_SAO_EDGE_CATEGORIES],
sao_info *sao_top, sao_info *sao_left)
{
@ -750,9 +779,13 @@ static void sao_search_best_mode(const pixel * data[], const pixel * recdata[],
*sao_out = band_sao;
}
// When BD-rate would increase because of SAO, disable it
if(sao_out->ddistortion >= 0) {
sao_out->type = SAO_TYPE_NONE;
// Choose between SAO and doing nothing, taking into account the
// rate-distortion cost of coding do nothing.
{
int cost_of_nothing = sao_mode_bits_none(sao_top, sao_left) * (int)(g_cur_lambda_cost + 0.5);
if (sao_out->ddistortion >= cost_of_nothing) {
sao_out->type = SAO_TYPE_NONE;
}
}
sao_out->merge_up_flag = sao_check_merge(sao_top, sao_out->type, sao_out->offsets,