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H.264 weighted prediction. 

Bidirectional weighting has not been tested for bitwise accuracy, but looks correct.

Originally committed as revision 3811 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Loren Merritt 21 years ago
parent
85df8f7cf0
commit
9f2d1b4ff5
3 changed files with 277 additions and 5 deletions
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  1. +97
    -0
      libavcodec/dsputil.c
  2. +5
    -0
      libavcodec/dsputil.h
  3. +175
    -5
      libavcodec/h264.c

+ 97
- 0
libavcodec/dsputil.c View File

@@ -2374,6 +2374,82 @@ H264_MC(avg_, 16)
#undef op2_put
#endif

static inline uint8_t clip1(int x){
if(x > 255) return 255;
if(x < 0) return 0;
return x;
}
#define op_scale1(x) block[x] = clip1( (block[x]*weight + offset) >> log2_denom )
#define op_scale2(x) dst[x] = clip( (src[x]*weights + dst[x]*weightd + offset) >> (log2_denom+1), 0, 255 )
#define H264_WEIGHT(W,H) \
static void weight_h264_pixels ## W ## x ## H ## _c(uint8_t *block, int stride, int log2_denom, int weight, int offset){ \
int x, y; \
offset <<= log2_denom; \
if(log2_denom) offset += 1<<(log2_denom-1); \
for(y=0; y<H; y++, block += stride){ \
op_scale1(0); \
op_scale1(1); \
if(W==2) continue; \
op_scale1(2); \
op_scale1(3); \
if(W==4) continue; \
op_scale1(4); \
op_scale1(5); \
op_scale1(6); \
op_scale1(7); \
if(W==8) continue; \
op_scale1(8); \
op_scale1(9); \
op_scale1(10); \
op_scale1(11); \
op_scale1(12); \
op_scale1(13); \
op_scale1(14); \
op_scale1(15); \
} \
} \
static void biweight_h264_pixels ## W ## x ## H ## _c(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offsetd, int offsets){ \
int x, y; \
int offset = (offsets + offsetd + 1) >> 1; \
offset = ((offset << 1) + 1) << log2_denom; \
for(y=0; y<H; y++, dst += stride, src += stride){ \
op_scale2(0); \
op_scale2(1); \
if(W==2) continue; \
op_scale2(2); \
op_scale2(3); \
if(W==4) continue; \
op_scale2(4); \
op_scale2(5); \
op_scale2(6); \
op_scale2(7); \
if(W==8) continue; \
op_scale2(8); \
op_scale2(9); \
op_scale2(10); \
op_scale2(11); \
op_scale2(12); \
op_scale2(13); \
op_scale2(14); \
op_scale2(15); \
} \
}

H264_WEIGHT(16,16)
H264_WEIGHT(16,8)
H264_WEIGHT(8,16)
H264_WEIGHT(8,8)
H264_WEIGHT(8,4)
H264_WEIGHT(4,8)
H264_WEIGHT(4,4)
H264_WEIGHT(4,2)
H264_WEIGHT(2,4)
H264_WEIGHT(2,2)

#undef op_scale1
#undef op_scale2
#undef H264_WEIGHT

static void wmv2_mspel8_h_lowpass(uint8_t *dst, uint8_t *src, int dstStride, int srcStride, int h){
uint8_t *cm = cropTbl + MAX_NEG_CROP;
int i;
@@ -3604,6 +3680,27 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
c->avg_h264_chroma_pixels_tab[1]= avg_h264_chroma_mc4_c;
c->avg_h264_chroma_pixels_tab[2]= avg_h264_chroma_mc2_c;

c->weight_h264_pixels_tab[0]= weight_h264_pixels16x16_c;
c->weight_h264_pixels_tab[1]= weight_h264_pixels16x8_c;
c->weight_h264_pixels_tab[2]= weight_h264_pixels8x16_c;
c->weight_h264_pixels_tab[3]= weight_h264_pixels8x8_c;
c->weight_h264_pixels_tab[4]= weight_h264_pixels8x4_c;
c->weight_h264_pixels_tab[5]= weight_h264_pixels4x8_c;
c->weight_h264_pixels_tab[6]= weight_h264_pixels4x4_c;
c->weight_h264_pixels_tab[7]= weight_h264_pixels4x2_c;
c->weight_h264_pixels_tab[8]= weight_h264_pixels2x4_c;
c->weight_h264_pixels_tab[9]= weight_h264_pixels2x2_c;
c->biweight_h264_pixels_tab[0]= biweight_h264_pixels16x16_c;
c->biweight_h264_pixels_tab[1]= biweight_h264_pixels16x8_c;
c->biweight_h264_pixels_tab[2]= biweight_h264_pixels8x16_c;
c->biweight_h264_pixels_tab[3]= biweight_h264_pixels8x8_c;
c->biweight_h264_pixels_tab[4]= biweight_h264_pixels8x4_c;
c->biweight_h264_pixels_tab[5]= biweight_h264_pixels4x8_c;
c->biweight_h264_pixels_tab[6]= biweight_h264_pixels4x4_c;
c->biweight_h264_pixels_tab[7]= biweight_h264_pixels4x2_c;
c->biweight_h264_pixels_tab[8]= biweight_h264_pixels2x4_c;
c->biweight_h264_pixels_tab[9]= biweight_h264_pixels2x2_c;

c->put_mspel_pixels_tab[0]= put_mspel8_mc00_c;
c->put_mspel_pixels_tab[1]= put_mspel8_mc10_c;
c->put_mspel_pixels_tab[2]= put_mspel8_mc20_c;


+ 5
- 0
libavcodec/dsputil.h View File

@@ -105,6 +105,8 @@ typedef void (*op_pixels_func)(uint8_t *block/*align width (8 or 16)*/, const ui
typedef void (*tpel_mc_func)(uint8_t *block/*align width (8 or 16)*/, const uint8_t *pixels/*align 1*/, int line_size, int w, int h);
typedef void (*qpel_mc_func)(uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);
typedef void (*h264_chroma_mc_func)(uint8_t *dst/*align 8*/, uint8_t *src/*align 1*/, int srcStride, int h, int x, int y);
typedef void (*h264_weight_func)(uint8_t *block, int stride, int log2_denom, int weight, int offset);
typedef void (*h264_biweight_func)(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offsetd, int offsets);

#define DEF_OLD_QPEL(name)\
void ff_put_ ## name (uint8_t *dst/*align width (8 or 16)*/, uint8_t *src/*align 1*/, int stride);\
@@ -258,6 +260,9 @@ typedef struct DSPContext {
qpel_mc_func put_h264_qpel_pixels_tab[3][16];
qpel_mc_func avg_h264_qpel_pixels_tab[3][16];
h264_weight_func weight_h264_pixels_tab[10];
h264_biweight_func biweight_h264_pixels_tab[10];
me_cmp_func pix_abs[2][4];
/* huffyuv specific */


+ 175
- 5
libavcodec/h264.c View File

@@ -255,12 +255,15 @@ typedef struct H264Context{
int max_pic_num;

//Weighted pred stuff
int use_weight;
int use_weight_chroma;
int luma_log2_weight_denom;
int chroma_log2_weight_denom;
int luma_weight[2][16];
int luma_offset[2][16];
int chroma_weight[2][16][2];
int chroma_offset[2][16][2];
int implicit_weight[16][16];
//deblock
int deblocking_filter; ///< disable_deblocking_filter_idc with 1<->0
@@ -2203,7 +2206,7 @@ static inline void mc_dir_part(H264Context *h, Picture *pic, int n, int square,
chroma_op(dest_cr, src_cr, s->uvlinesize, chroma_height, mx&7, my&7);
}

static inline void mc_part(H264Context *h, int n, int square, int chroma_height, int delta,
static inline void mc_part_std(H264Context *h, int n, int square, int chroma_height, int delta,
uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
int x_offset, int y_offset,
qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
@@ -2237,9 +2240,95 @@ static inline void mc_part(H264Context *h, int n, int square, int chroma_height,
}
}

static inline void mc_part_weighted(H264Context *h, int n, int square, int chroma_height, int delta,
uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
int x_offset, int y_offset,
qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
h264_weight_func luma_weight_op, h264_weight_func chroma_weight_op,
h264_biweight_func luma_weight_avg, h264_biweight_func chroma_weight_avg,
int list0, int list1){
MpegEncContext * const s = &h->s;

dest_y += 2*x_offset + 2*y_offset*s-> linesize;
dest_cb += x_offset + y_offset*s->uvlinesize;
dest_cr += x_offset + y_offset*s->uvlinesize;
x_offset += 8*s->mb_x;
y_offset += 8*s->mb_y;
if(list0 && list1){
/* don't optimize for luma-only case, since B-frames usually
* use implicit weights => chroma too. */
uint8_t *tmp_cb = s->obmc_scratchpad;
uint8_t *tmp_cr = tmp_cb + 8*s->uvlinesize;
uint8_t *tmp_y = tmp_cr + 8*s->uvlinesize;
int refn0 = h->ref_cache[0][ scan8[n] ];
int refn1 = h->ref_cache[1][ scan8[n] ];

mc_dir_part(h, &h->ref_list[0][refn0], n, square, chroma_height, delta, 0,
dest_y, dest_cb, dest_cr,
x_offset, y_offset, qpix_put, chroma_put);
mc_dir_part(h, &h->ref_list[1][refn1], n, square, chroma_height, delta, 1,
tmp_y, tmp_cb, tmp_cr,
x_offset, y_offset, qpix_put, chroma_put);

if(h->use_weight == 2){
int weight0 = h->implicit_weight[refn0][refn1];
int weight1 = 64 - weight0;
luma_weight_avg( dest_y, tmp_y, s-> linesize, 5, weight0, weight1, 0, 0);
chroma_weight_avg(dest_cb, tmp_cb, s->uvlinesize, 5, weight0, weight1, 0, 0);
chroma_weight_avg(dest_cr, tmp_cr, s->uvlinesize, 5, weight0, weight1, 0, 0);
}else{
luma_weight_avg(dest_y, tmp_y, s->linesize, h->luma_log2_weight_denom,
h->luma_weight[0][refn0], h->luma_weight[1][refn1],
h->luma_offset[0][refn0], h->luma_offset[1][refn1]);
chroma_weight_avg(dest_cb, tmp_cb, s->uvlinesize, h->chroma_log2_weight_denom,
h->chroma_weight[0][refn0][0], h->chroma_weight[1][refn1][0],
h->chroma_offset[0][refn0][0], h->chroma_offset[1][refn1][0]);
chroma_weight_avg(dest_cr, tmp_cr, s->uvlinesize, h->chroma_log2_weight_denom,
h->chroma_weight[0][refn0][1], h->chroma_weight[1][refn1][1],
h->chroma_offset[0][refn0][1], h->chroma_offset[1][refn1][1]);
}
}else{
int list = list1 ? 1 : 0;
int refn = h->ref_cache[list][ scan8[n] ];
Picture *ref= &h->ref_list[list][refn];
mc_dir_part(h, ref, n, square, chroma_height, delta, list,
dest_y, dest_cb, dest_cr, x_offset, y_offset,
qpix_put, chroma_put);

luma_weight_op(dest_y, s->linesize, h->luma_log2_weight_denom,
h->luma_weight[list][refn], h->luma_offset[list][refn]);
if(h->use_weight_chroma){
chroma_weight_op(dest_cb, s->uvlinesize, h->chroma_log2_weight_denom,
h->chroma_weight[list][refn][0], h->chroma_offset[list][refn][0]);
chroma_weight_op(dest_cr, s->uvlinesize, h->chroma_log2_weight_denom,
h->chroma_weight[list][refn][1], h->chroma_offset[list][refn][1]);
}
}
}

static inline void mc_part(H264Context *h, int n, int square, int chroma_height, int delta,
uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
int x_offset, int y_offset,
qpel_mc_func *qpix_put, h264_chroma_mc_func chroma_put,
qpel_mc_func *qpix_avg, h264_chroma_mc_func chroma_avg,
h264_weight_func *weight_op, h264_biweight_func *weight_avg,
int list0, int list1){
if((h->use_weight==2 && list0 && list1
&& (h->implicit_weight[ h->ref_cache[0][scan8[n]] ][ h->ref_cache[1][scan8[n]] ] != 32))
|| h->use_weight==1)
mc_part_weighted(h, n, square, chroma_height, delta, dest_y, dest_cb, dest_cr,
x_offset, y_offset, qpix_put, chroma_put,
weight_op[0], weight_op[3], weight_avg[0], weight_avg[3], list0, list1);
else
mc_part_std(h, n, square, chroma_height, delta, dest_y, dest_cb, dest_cr,
x_offset, y_offset, qpix_put, chroma_put, qpix_avg, chroma_avg, list0, list1);
}

static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
qpel_mc_func (*qpix_put)[16], h264_chroma_mc_func (*chroma_put),
qpel_mc_func (*qpix_avg)[16], h264_chroma_mc_func (*chroma_avg)){
qpel_mc_func (*qpix_avg)[16], h264_chroma_mc_func (*chroma_avg),
h264_weight_func *weight_op, h264_biweight_func *weight_avg){
MpegEncContext * const s = &h->s;
const int mb_xy= s->mb_x + s->mb_y*s->mb_stride;
const int mb_type= s->current_picture.mb_type[mb_xy];
@@ -2249,20 +2338,25 @@ static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t
if(IS_16X16(mb_type)){
mc_part(h, 0, 1, 8, 0, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[0], chroma_put[0], qpix_avg[0], chroma_avg[0],
&weight_op[0], &weight_avg[0],
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
}else if(IS_16X8(mb_type)){
mc_part(h, 0, 0, 4, 8, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
&weight_op[1], &weight_avg[1],
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
mc_part(h, 8, 0, 4, 8, dest_y, dest_cb, dest_cr, 0, 4,
qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
&weight_op[1], &weight_avg[1],
IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
}else if(IS_8X16(mb_type)){
mc_part(h, 0, 0, 8, 8*s->linesize, dest_y, dest_cb, dest_cr, 0, 0,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[2], &weight_avg[2],
IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
mc_part(h, 4, 0, 8, 8*s->linesize, dest_y, dest_cb, dest_cr, 4, 0,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[2], &weight_avg[2],
IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
}else{
int i;
@@ -2278,20 +2372,25 @@ static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t
if(IS_SUB_8X8(sub_mb_type)){
mc_part(h, n, 1, 4, 0, dest_y, dest_cb, dest_cr, x_offset, y_offset,
qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
&weight_op[3], &weight_avg[3],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
}else if(IS_SUB_8X4(sub_mb_type)){
mc_part(h, n , 0, 2, 4, dest_y, dest_cb, dest_cr, x_offset, y_offset,
qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
&weight_op[4], &weight_avg[4],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
mc_part(h, n+2, 0, 2, 4, dest_y, dest_cb, dest_cr, x_offset, y_offset+2,
qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
&weight_op[4], &weight_avg[4],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
}else if(IS_SUB_4X8(sub_mb_type)){
mc_part(h, n , 0, 4, 4*s->linesize, dest_y, dest_cb, dest_cr, x_offset, y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[5], &weight_avg[5],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
mc_part(h, n+1, 0, 4, 4*s->linesize, dest_y, dest_cb, dest_cr, x_offset+2, y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[5], &weight_avg[5],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
}else{
int j;
@@ -2301,6 +2400,7 @@ static void hl_motion(H264Context *h, uint8_t *dest_y, uint8_t *dest_cb, uint8_t
int sub_y_offset= y_offset + (j&2);
mc_part(h, n+j, 1, 2, 0, dest_y, dest_cb, dest_cr, sub_x_offset, sub_y_offset,
qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
&weight_op[6], &weight_avg[6],
IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
}
}
@@ -2397,6 +2497,8 @@ static void free_tables(H264Context *h){

av_freep(&h->mb2b_xy);
av_freep(&h->mb2b8_xy);

av_freep(&h->s.obmc_scratchpad);
}

/**
@@ -2437,6 +2539,8 @@ static int alloc_tables(H264Context *h){
h->mb2b8_xy[mb_xy]= b8_xy;
}
}

CHECKED_ALLOCZ(s->obmc_scratchpad, 16*s->linesize + 2*8*s->uvlinesize);
return 0;
fail:
@@ -2668,7 +2772,8 @@ static void hl_decode_mb(H264Context *h){
}else if(s->codec_id == CODEC_ID_H264){
hl_motion(h, dest_y, dest_cb, dest_cr,
s->dsp.put_h264_qpel_pixels_tab, s->dsp.put_h264_chroma_pixels_tab,
s->dsp.avg_h264_qpel_pixels_tab, s->dsp.avg_h264_chroma_pixels_tab);
s->dsp.avg_h264_qpel_pixels_tab, s->dsp.avg_h264_chroma_pixels_tab,
s->dsp.weight_h264_pixels_tab, s->dsp.biweight_h264_pixels_tab);
}


@@ -2898,9 +3003,14 @@ static int decode_ref_pic_list_reordering(H264Context *h){
static int pred_weight_table(H264Context *h){
MpegEncContext * const s = &h->s;
int list, i;
int luma_def, chroma_def;
h->use_weight= 0;
h->use_weight_chroma= 0;
h->luma_log2_weight_denom= get_ue_golomb(&s->gb);
h->chroma_log2_weight_denom= get_ue_golomb(&s->gb);
luma_def = 1<<h->luma_log2_weight_denom;
chroma_def = 1<<h->chroma_log2_weight_denom;

for(list=0; list<2; list++){
for(i=0; i<h->ref_count[list]; i++){
@@ -2910,6 +3020,12 @@ static int pred_weight_table(H264Context *h){
if(luma_weight_flag){
h->luma_weight[list][i]= get_se_golomb(&s->gb);
h->luma_offset[list][i]= get_se_golomb(&s->gb);
if( h->luma_weight[list][i] != luma_def
|| h->luma_offset[list][i] != 0)
h->use_weight= 1;
}else{
h->luma_weight[list][i]= luma_def;
h->luma_offset[list][i]= 0;
}

chroma_weight_flag= get_bits1(&s->gb);
@@ -2918,14 +3034,62 @@ static int pred_weight_table(H264Context *h){
for(j=0; j<2; j++){
h->chroma_weight[list][i][j]= get_se_golomb(&s->gb);
h->chroma_offset[list][i][j]= get_se_golomb(&s->gb);
if( h->chroma_weight[list][i][j] != chroma_def
|| h->chroma_offset[list][i][j] != 0)
h->use_weight_chroma= 1;
}
}else{
int j;
for(j=0; j<2; j++){
h->chroma_weight[list][i][j]= chroma_def;
h->chroma_offset[list][i][j]= 0;
}
}
}
if(h->slice_type != B_TYPE) break;
}
h->use_weight= h->use_weight || h->use_weight_chroma;
return 0;
}

static void implicit_weight_table(H264Context *h){
MpegEncContext * const s = &h->s;
int list, i;
int ref0, ref1;
int cur_poc = s->current_picture_ptr->poc;

if( h->ref_count[0] == 1 && h->ref_count[1] == 1
&& h->ref_list[0][0].poc + h->ref_list[1][0].poc == 2*cur_poc){
h->use_weight= 0;
h->use_weight_chroma= 0;
return;
}

h->use_weight= 2;
h->use_weight_chroma= 2;
h->luma_log2_weight_denom= 5;
h->chroma_log2_weight_denom= 5;

/* FIXME: MBAFF */
for(ref0=0; ref0 < h->ref_count[0]; ref0++){
int poc0 = h->ref_list[0][ref0].poc;
for(ref1=0; ref1 < h->ref_count[1]; ref1++){
int poc1 = h->ref_list[0][ref1].poc;
int td = clip(poc1 - poc0, -128, 127);
if(td){
int tb = clip(cur_poc - poc0, -128, 127);
int tx = (16384 + (ABS(td) >> 1)) / td;
int dist_scale_factor = clip((tb*tx + 32) >> 6, -1024, 1023) >> 2;
if(dist_scale_factor < -64 || dist_scale_factor > 128)
h->implicit_weight[ref0][ref1] = 32;
else
h->implicit_weight[ref0][ref1] = 64 - dist_scale_factor;
}else
h->implicit_weight[ref0][ref1] = 32;
}
}
}

/**
* instantaneous decoder refresh.
*/
@@ -3387,6 +3551,10 @@ static int decode_slice_header(H264Context *h){
if( (h->pps.weighted_pred && (h->slice_type == P_TYPE || h->slice_type == SP_TYPE ))
|| (h->pps.weighted_bipred_idc==1 && h->slice_type==B_TYPE ) )
pred_weight_table(h);
else if(h->pps.weighted_bipred_idc==2 && h->slice_type==B_TYPE)
implicit_weight_table(h);
else
h->use_weight = 0;
if(s->current_picture.reference)
decode_ref_pic_marking(h);
@@ -3431,14 +3599,16 @@ static int decode_slice_header(H264Context *h){
h->slice_num++;

if(s->avctx->debug&FF_DEBUG_PICT_INFO){
av_log(h->s.avctx, AV_LOG_DEBUG, "slice:%d mb:%d %c pps:%d frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d\n",
av_log(h->s.avctx, AV_LOG_DEBUG, "slice:%d mb:%d %c pps:%d frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d weight:%d%s\n",
h->slice_num, first_mb_in_slice,
av_get_pict_type_char(h->slice_type),
pps_id, h->frame_num,
s->current_picture_ptr->field_poc[0], s->current_picture_ptr->field_poc[1],
h->ref_count[0], h->ref_count[1],
s->qscale,
h->deblocking_filter
h->deblocking_filter,
h->use_weight,
h->use_weight==1 && h->use_weight_chroma ? "c" : ""
);
}



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