From a61456152d91673bd174ec7f9b23d51077f0d9de Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Wed, 18 Apr 2007 17:36:52 +0000 Subject: [PATCH] Pullback should be performed on scaled motion vectors in B-frames Originally committed as revision 8750 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/vc1.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c index 77d6828..23a3d91 100644 --- a/libavcodec/vc1.c +++ b/libavcodec/vc1.c @@ -2304,6 +2304,12 @@ static inline void vc1_pred_b_mv(VC1Context *v, int dmv_x[2], int dmv_y[2], int s->mv[0][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 0, s->quarter_sample); s->mv[1][0][0] = scale_mv(s->next_picture.motion_val[1][xy][0], v->bfraction, 1, s->quarter_sample); s->mv[1][0][1] = scale_mv(s->next_picture.motion_val[1][xy][1], v->bfraction, 1, s->quarter_sample); + + /* Pullback predicted motion vectors as specified in 8.4.5.4 */ + s->mv[0][0][0] = av_clip(s->mv[0][0][0], -60 - (s->mb_x << 6), (s->mb_width << 6) - 4 - (s->mb_x << 6)); + s->mv[0][0][1] = av_clip(s->mv[0][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6)); + s->mv[1][0][0] = av_clip(s->mv[1][0][0], -60 - (s->mb_x << 6), (s->mb_width << 6) - 4 - (s->mb_x << 6)); + s->mv[1][0][1] = av_clip(s->mv[1][0][1], -60 - (s->mb_y << 6), (s->mb_height << 6) - 4 - (s->mb_y << 6)); if(direct) { s->current_picture.motion_val[0][xy][0] = s->mv[0][0][0]; s->current_picture.motion_val[0][xy][1] = s->mv[0][0][1]; -- 2.7.4