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Fix chroma mv offsets for PAFF in a way that is compatible with MBAFF by 

setting Picture.reference to indicate parity for all Pictures in
reference list.

Patch by Jeff Downs, heydowns T borg O com

Originally committed as revision 10744 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jeff Downs 2007-10-15 22:17:39 +00:00 committed by Carl Eugen Hoyos
parent f1bf85b8cf
commit 2143b11853
1 changed files with 8 additions and 6 deletions
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14
libavcodec/h264.c
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@ -1729,7 +1729,7 @@ static inline void mc_dir_part(H264Context *h, Picture *pic, int n, int square,
if(MB_FIELD){
// chroma offset when predicting from a field of opposite parity
my += 2 * ((s->mb_y & 1) - (h->ref_cache[list][scan8[n]] & 1));
my += 2 * ((s->mb_y & 1) - (pic->reference - 1));
emu |= (my>>3) < 0 || (my>>3) + 8 >= (pic_height>>1);
}
src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->mb_uvlinesize;
@ -2764,11 +2764,12 @@ static void hl_decode_mb(H264Context *h){
else hl_decode_mb_simple(h);
}
static void pic_as_field(Picture *pic, const int bottom){
static void pic_as_field(Picture *pic, const int parity){
int i;
for (i = 0; i < 4; ++i) {
if (bottom)
if (parity == PICT_BOTTOM_FIELD)
pic->data[i] += pic->linesize[i];
pic->reference = parity;
pic->linesize[i] *= 2;
}
}
@ -2779,7 +2780,7 @@ static int split_field_copy(Picture *dest, Picture *src,
if (match) {
*dest = *src;
pic_as_field(dest, parity == PICT_BOTTOM_FIELD);
pic_as_field(dest, parity);
dest->pic_id *= 2;
dest->pic_id += id_add;
}
@ -3133,8 +3134,7 @@ static int decode_ref_pic_list_reordering(H264Context *h){
}
h->ref_list[list][index]= *ref;
if (FIELD_PICTURE){
int bot = pic_structure == PICT_BOTTOM_FIELD;
pic_as_field(&h->ref_list[list][index], bot);
pic_as_field(&h->ref_list[list][index], pic_structure);
}
}
}else{
@ -3166,9 +3166,11 @@ static void fill_mbaff_ref_list(H264Context *h){
field[0] = *frame;
for(j=0; j<3; j++)
field[0].linesize[j] <<= 1;
field[0].reference = PICT_TOP_FIELD;
field[1] = field[0];
for(j=0; j<3; j++)
field[1].data[j] += frame->linesize[j];
field[1].reference = PICT_BOTTOM_FIELD;
h->luma_weight[list][16+2*i] = h->luma_weight[list][16+2*i+1] = h->luma_weight[list][i];
h->luma_offset[list][16+2*i] = h->luma_offset[list][16+2*i+1] = h->luma_offset[list][i];