dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-18 23:09:52 +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

100
src/dec/frame.c
View File

@ -97,53 +97,50 @@ static void FilterRow(const VP8Decoder* const dec) {
}
//------------------------------------------------------------------------------
// Precompute the filtering strength for each segment and each i4x4/i16x16 mode.
void VP8StoreBlock(VP8Decoder* const dec) {
static void PrecomputeFilterStrengths(VP8Decoder* const dec) {
if (dec->filter_type_ > 0) {
VP8FInfo* const info = dec->f_info_ + dec->mb_x_;
const int skip = dec->mb_info_[dec->mb_x_].skip_;
int level = dec->filter_levels_[dec->segment_];
if (dec->filter_hdr_.use_lf_delta_) {
// TODO(skal): only CURRENT is handled for now.
level += dec->filter_hdr_.ref_lf_delta_[0];
if (dec->is_i4x4_) {
level += dec->filter_hdr_.mode_lf_delta_[0];
}
}
level = (level < 0) ? 0 : (level > 63) ? 63 : level;
info->f_level_ = level;
if (dec->filter_hdr_.sharpness_ > 0) {
if (dec->filter_hdr_.sharpness_ > 4) {
level >>= 2;
int s;
const VP8FilterHeader* const hdr = &dec->filter_hdr_;
for (s = 0; s < NUM_MB_SEGMENTS; ++s) {
int i4x4;
// First, compute the initial level
int base_level;
if (dec->segment_hdr_.use_segment_) {
base_level = dec->segment_hdr_.filter_strength_[s];
if (!dec->segment_hdr_.absolute_delta_) {
base_level += hdr->level_;
}
} else {
level >>= 1;
base_level = hdr->level_;
}
if (level > 9 - dec->filter_hdr_.sharpness_) {
level = 9 - dec->filter_hdr_.sharpness_;
}
}
for (i4x4 = 0; i4x4 <= 1; ++i4x4) {
VP8FInfo* const info = &dec->fstrengths_[s][i4x4];
int level = base_level;
if (hdr->use_lf_delta_) {
// TODO(skal): only CURRENT is handled for now.
level += hdr->ref_lf_delta_[0];
if (i4x4) {
level += hdr->mode_lf_delta_[0];
}
}
level = (level < 0) ? 0 : (level > 63) ? 63 : level;
info->f_level_ = level;
info->f_ilevel_ = (level < 1) ? 1 : level;
info->f_inner_ = (!skip || dec->is_i4x4_);
}
{
// Transfer samples to row cache
int y;
const int y_offset = dec->cache_id_ * 16 * dec->cache_y_stride_;
const int uv_offset = dec->cache_id_ * 8 * dec->cache_uv_stride_;
uint8_t* const ydst = dec->cache_y_ + dec->mb_x_ * 16 + y_offset;
uint8_t* const udst = dec->cache_u_ + dec->mb_x_ * 8 + uv_offset;
uint8_t* const vdst = dec->cache_v_ + dec->mb_x_ * 8 + uv_offset;
for (y = 0; y < 16; ++y) {
memcpy(ydst + y * dec->cache_y_stride_,
dec->yuv_b_ + Y_OFF + y * BPS, 16);
}
for (y = 0; y < 8; ++y) {
memcpy(udst + y * dec->cache_uv_stride_,
dec->yuv_b_ + U_OFF + y * BPS, 8);
memcpy(vdst + y * dec->cache_uv_stride_,
dec->yuv_b_ + V_OFF + y * BPS, 8);
if (hdr->sharpness_ > 0) {
if (hdr->sharpness_ > 4) {
level >>= 2;
} else {
level >>= 1;
}
if (level > 9 - hdr->sharpness_) {
level = 9 - hdr->sharpness_;
}
}
info->f_ilevel_ = (level < 1) ? 1 : level;
info->f_inner_ = 0;
}
}
}
}
@ -339,6 +336,7 @@ VP8StatusCode VP8EnterCritical(VP8Decoder* const dec, VP8Io* const io) {
dec->br_mb_y_ = dec->mb_h_;
}
}
PrecomputeFilterStrengths(dec);
return VP8_STATUS_OK;
}
@ -551,6 +549,7 @@ static WEBP_INLINE void Copy32b(uint8_t* dst, uint8_t* src) {
}
void VP8ReconstructBlock(VP8Decoder* const dec) {
int j;
uint8_t* const y_dst = dec->yuv_b_ + Y_OFF;
uint8_t* const u_dst = dec->yuv_b_ + U_OFF;
uint8_t* const v_dst = dec->yuv_b_ + V_OFF;
@ -558,7 +557,6 @@ void VP8ReconstructBlock(VP8Decoder* const dec) {
// Rotate in the left samples from previously decoded block. We move four
// pixels at a time for alignment reason, and because of in-loop filter.
if (dec->mb_x_ > 0) {
int j;
for (j = -1; j < 16; ++j) {
Copy32b(&y_dst[j * BPS - 4], &y_dst[j * BPS + 12]);
}
@ -567,7 +565,6 @@ void VP8ReconstructBlock(VP8Decoder* const dec) {
Copy32b(&v_dst[j * BPS - 4], &v_dst[j * BPS + 4]);
}
} else {
int j;
for (j = 0; j < 16; ++j) {
y_dst[j * BPS - 1] = 129;
}
@ -670,6 +667,21 @@ void VP8ReconstructBlock(VP8Decoder* const dec) {
}
}
}
// Transfer reconstructed samples from yuv_b_ cache to final destination.
{
const int y_offset = dec->cache_id_ * 16 * dec->cache_y_stride_;
const int uv_offset = dec->cache_id_ * 8 * dec->cache_uv_stride_;
uint8_t* const y_out = dec->cache_y_ + dec->mb_x_ * 16 + y_offset;
uint8_t* const u_out = dec->cache_u_ + dec->mb_x_ * 8 + uv_offset;
uint8_t* const v_out = dec->cache_v_ + dec->mb_x_ * 8 + uv_offset;
for (j = 0; j < 16; ++j) {
memcpy(y_out + j * dec->cache_y_stride_, y_dst + j * BPS, 16);
}
for (j = 0; j < 8; ++j) {
memcpy(u_out + j * dec->cache_uv_stride_, u_dst + j * BPS, 8);
memcpy(v_out + j * dec->cache_uv_stride_, v_dst + j * BPS, 8);
}
}
}
//------------------------------------------------------------------------------