From d88ea354638b3624a9658cd0702598bd64905a4b Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 7 Feb 2010 01:17:13 +0000
Subject: [PATCH] Fix reference selection for colocated MBs from frames to
 fields.

Originally committed as revision 21663 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/h264_direct.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/h264_direct.c b/libavcodec/h264_direct.c
index fa9380d563..f8b86358f0 100644
--- a/libavcodec/h264_direct.c
+++ b/libavcodec/h264_direct.c
@@ -123,6 +123,12 @@ void ff_h264_direct_ref_list_init(H264Context * const h){
     if(cur->pict_type != FF_B_TYPE || h->direct_spatial_mv_pred)
         return;
 
+    if(s->picture_structure == PICT_FRAME){
+        int cur_poc = s->current_picture_ptr->poc;
+        int *col_poc = h->ref_list[1]->field_poc;
+        ref1sidx=sidx= (FFABS(col_poc[0] - cur_poc) >= FFABS(col_poc[1] - cur_poc));
+    }
+
     for(list=0; list<2; list++){
         fill_colmap(h, h->map_col_to_list0, list, sidx, ref1sidx, 0);
         for(field=0; field<2; field++)