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

decoding speed-up (~1%)

Browse Source 
- precompute filtering strength once for all at the beginning
  instead of per-macroblock
- reduce size of VP8MB struct from 8 bytes to 4.
- removed VP8StoreBlock() accordingly

Change-Id: Icf3d329473e21c464770be3d72a04c9ee4c321f2
This commit is contained in:
Pascal Massimino
2012-12-14 10:22:54 -08:00
parent bcec339b01
commit 0f57dcc31f
4 changed files with 68 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

24
src/dec/vp8.c
View File

@ -236,20 +236,6 @@ static int ParseFilterHeader(VP8BitReader* br, VP8Decoder* const dec) {
}
}
dec->filter_type_ = (hdr->level_ == 0) ? 0 : hdr->simple_ ? 1 : 2;
if (dec->filter_type_ > 0) { // precompute filter levels per segment
if (dec->segment_hdr_.use_segment_) {
int s;
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
int strength = dec->segment_hdr_.filter_strength_[s];
if (!dec->segment_hdr_.absolute_delta_) {
strength += hdr->level_;
}
dec->filter_levels_[s] = strength;
}
} else {
dec->filter_levels_[0] = hdr->level_;
}
}
return !br->eof_;
}
@ -675,6 +661,12 @@ int VP8DecodeMB(VP8Decoder* const dec, VP8BitReader* const token_br) {
dec->non_zero_ac_ = 0;
}
if (dec->filter_type_ > 0) { // store filter info
VP8FInfo* const finfo = dec->f_info_ + dec->mb_x_;
*finfo = dec->fstrengths_[dec->segment_][dec->is_i4x4_];
finfo->f_inner_ = (!info->skip_ || dec->is_i4x4_);
}
return (!token_br->eof_);
}
@ -698,10 +690,8 @@ static int ParseFrame(VP8Decoder* const dec, VP8Io* io) {
return VP8SetError(dec, VP8_STATUS_NOT_ENOUGH_DATA,
"Premature end-of-file encountered.");
}
// Reconstruct and emit samples.
VP8ReconstructBlock(dec);
// Store data and save block's filtering params
VP8StoreBlock(dec);
}
if (!VP8ProcessRow(dec, io)) {
return VP8SetError(dec, VP8_STATUS_USER_ABORT, "Output aborted.");