dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-13 14:34:33 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

add a -partition_limit option to limit the number of bits used by intra4x4

Browse Source 
Although it degrades quality, this option is useful to avoid the 512k
limit for partition #0.
If not enough to reach the lower bound of 4bits per macroblock header,
one should also limit the number of segments used (down to -segments 1)

See the man file for extra details.

Change-Id: Ia59ffac13176c85b809ddd6340d37b54ee9487ea
This commit is contained in:
Pascal Massimino
2011-08-23 15:58:22 -07:00
parent cd12b4b0ac
commit 900286e091
8 changed files with 56 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
src/enc/quant.c
View File

@ -757,8 +757,13 @@ static int PickBestIntra4(VP8EncIterator* const it, VP8ModeScore* const rd) {
const int tlambda = dqm->tlambda_;
const uint8_t* const src0 = it->yuv_in_ + Y_OFF;
uint8_t* const best_blocks = it->yuv_out2_ + Y_OFF;
int total_header_bits = 0;
VP8ModeScore rd_best;
if (enc->max_i4_header_bits_ == 0) {
return 0;
}
InitScore(&rd_best);
rd_best.score = 211; // '211' is the value of VP8BitCost(0, 145)
VP8IteratorStartI4(it);
@ -799,7 +804,9 @@ static int PickBestIntra4(VP8EncIterator* const it, VP8ModeScore* const rd) {
}
SetRDScore(dqm->lambda_mode_, &rd_i4);
AddScore(&rd_best, &rd_i4);
if (rd_best.score >= rd->score) {
total_header_bits += mode_costs[best_mode];
if (rd_best.score >= rd->score ||
total_header_bits > enc->max_i4_header_bits_) {
return 0;
}
// Copy selected samples if not in the right place already.