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Modifies macroblock addressing and current macroblock y-position for field decoding. 

Adds convenience definition for pictures that are field or mbaff based. Part of PAFF implementation.

patch by Jeff Downs, heydowns a borg d com
original thread:
Subject: [FFmpeg-devel] [PATCH] Implement PAFF in H.264
Date: 18/09/07 20:30

Originally committed as revision 10672 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jeff Downs 2007-10-06 05:59:14 +00:00 committed by Andreas Öman
parent 949da388de
commit f3e53d9fcd
2 changed files with 11 additions and 6 deletions
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16
libavcodec/h264.c
View File

@ -177,7 +177,7 @@ static void fill_caches(H264Context *h, int mb_type, int for_deblock){
//wow what a mess, why didn't they simplify the interlacing&intra stuff, i can't imagine that these complex rules are worth it
top_xy = mb_xy - s->mb_stride;
top_xy = mb_xy - (s->mb_stride << FIELD_PICTURE);
topleft_xy = top_xy - 1;
topright_xy= top_xy + 1;
left_xy[1] = left_xy[0] = mb_xy-1;
@ -3921,13 +3921,15 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
s->current_picture_ptr->frame_num= h->frame_num; //FIXME frame_num cleanup
assert(s->mb_num == s->mb_width * s->mb_height);
if(first_mb_in_slice << h->mb_aff_frame >= s->mb_num ||
if(first_mb_in_slice << FIELD_OR_MBAFF_PICTURE >= s->mb_num ||
first_mb_in_slice >= s->mb_num){
av_log(h->s.avctx, AV_LOG_ERROR, "first_mb_in_slice overflow\n");
return -1;
}
s->resync_mb_x = s->mb_x = first_mb_in_slice % s->mb_width;
s->resync_mb_y = s->mb_y = (first_mb_in_slice / s->mb_width) << h->mb_aff_frame;
s->resync_mb_y = s->mb_y = (first_mb_in_slice / s->mb_width) << FIELD_OR_MBAFF_PICTURE;
if (s->picture_structure == PICT_BOTTOM_FIELD)
s->resync_mb_y = s->mb_y = s->mb_y + 1;
assert(s->mb_y < s->mb_height);
if(s->picture_structure==PICT_FRAME){
@ -4987,7 +4989,7 @@ static int decode_cabac_mb_skip( H264Context *h, int mb_x, int mb_y ) {
}else{
int mb_xy = mb_x + mb_y*s->mb_stride;
mba_xy = mb_xy - 1;
mbb_xy = mb_xy - s->mb_stride;
mbb_xy = mb_xy - (s->mb_stride << FIELD_PICTURE);
}
if( h->slice_table[mba_xy] == h->slice_num && !IS_SKIP( s->current_picture.mb_type[mba_xy] ))
@ -5431,6 +5433,8 @@ static inline void compute_mb_neighbors(H264Context *h)
if (left_mb_frame_flag != curr_mb_frame_flag) {
h->left_mb_xy[0] = pair_xy - 1;
}
} else if (FIELD_PICTURE) {
h->top_mb_xy -= s->mb_stride;
}
return;
}
@ -6666,7 +6670,7 @@ static int decode_slice(struct AVCodecContext *avctx, H264Context *h){
s->mb_x = 0;
ff_draw_horiz_band(s, 16*s->mb_y, 16);
++s->mb_y;
if(FRAME_MBAFF) {
if(FIELD_OR_MBAFF_PICTURE) {
++s->mb_y;
}
}
@ -6703,7 +6707,7 @@ static int decode_slice(struct AVCodecContext *avctx, H264Context *h){
s->mb_x=0;
ff_draw_horiz_band(s, 16*s->mb_y, 16);
++s->mb_y;
if(FRAME_MBAFF) {
if(FIELD_OR_MBAFF_PICTURE) {
++s->mb_y;
}
if(s->mb_y >= s->mb_height){

1
libavcodec/h264.h
View File

@ -68,6 +68,7 @@
#undef IS_INTERLACED
#define IS_INTERLACED(mb_type) 0
#endif
#define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
/**
* Sequence parameter set