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Fix dual prime motion compensation in field pictures.

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Fixes issue1125.

Originally committed as revision 20666 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2009-11-30 02:37:03 +00:00
parent 419bddd366
commit f0ec239438
1 changed files with 5 additions and 3 deletions
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8
libavcodec/mpeg12.c
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@ -448,18 +448,20 @@ static int mpeg_decode_mb(MpegEncContext *s,
for(i=0;i<2;i++) {
if (USES_LIST(mb_type, i)) {
int dmx, dmy, mx, my, m;
const int my_shift= s->picture_structure == PICT_FRAME;
mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0],
s->last_mv[i][0][0]);
s->last_mv[i][0][0] = mx;
s->last_mv[i][1][0] = mx;
dmx = get_dmv(s);
my = mpeg_decode_motion(s, s->mpeg_f_code[i][1],
s->last_mv[i][0][1] >> 1);
s->last_mv[i][0][1] >> my_shift);
dmy = get_dmv(s);
s->last_mv[i][0][1] = my<<1;
s->last_mv[i][1][1] = my<<1;
s->last_mv[i][0][1] = my<<my_shift;
s->last_mv[i][1][1] = my<<my_shift;
s->mv[i][0][0] = mx;
s->mv[i][0][1] = my;