Edge emulation for fields. 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 10674 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -4096,7 +4096,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
     h->slice_num = ++h0->current_slice;
 
     h->emu_edge_width= (s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;
-    h->emu_edge_height= FRAME_MBAFF ? 0 : h->emu_edge_width;
+    h->emu_edge_height= (FRAME_MBAFF || FIELD_PICTURE) ? 0 : h->emu_edge_width;
 
     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
         av_log(h->s.avctx, AV_LOG_DEBUG, "slice:%d %s mb:%d %c pps:%u frame:%d poc:%d/%d ref:%d/%d qp:%d loop:%d:%d:%d weight:%d%s\n",