h264: move initialising the explicit pred weight table for MBAFF

Currently it's done in the code that initialises the ref list for
MBAFF, which is not a logical place for it. Move it to the function that
parses the pred table from the bitstream, which is analogous to what is
done for the implicit weight table as well.

libavcodec/h264_parse.c

@@ -26,7 +26,7 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
                               const int *ref_count, int slice_type_nos,
                               H264PredWeightTable *pwt)
 {
-    int list, i;
+    int list, i, j;
     int luma_def, chroma_def;
 
     pwt->use_weight             = 0;
@@ -78,6 +78,14 @@ int ff_h264_pred_weight_table(GetBitContext *gb, const SPS *sps,
                     }
                 }
             }
+
+            // for MBAFF
+            pwt->luma_weight[16 + 2 * i][list][0] = pwt->luma_weight[16 + 2 * i + 1][list][0] = pwt->luma_weight[i][list][0];
+            pwt->luma_weight[16 + 2 * i][list][1] = pwt->luma_weight[16 + 2 * i + 1][list][1] = pwt->luma_weight[i][list][1];
+            for (j = 0; j < 2; j++) {
+                pwt->chroma_weight[16 + 2 * i][list][j][0] = pwt->chroma_weight[16 + 2 * i + 1][list][j][0] = pwt->chroma_weight[i][list][j][0];
+                pwt->chroma_weight[16 + 2 * i][list][j][1] = pwt->chroma_weight[16 + 2 * i + 1][list][j][1] = pwt->chroma_weight[i][list][j][1];
+            }
         }
         if (slice_type_nos != AV_PICTURE_TYPE_B)
             break;

libavcodec/h264_refs.c

@@ -373,13 +373,6 @@ void ff_h264_fill_mbaff_ref_list(H264SliceContext *sl)
                 field[1].data[j] += frame->parent->f->linesize[j];
             field[1].reference = PICT_BOTTOM_FIELD;
             field[1].poc       = field[1].parent->field_poc[1];
-
-            sl->pwt.luma_weight[16 + 2 * i][list][0] = sl->pwt.luma_weight[16 + 2 * i + 1][list][0] = sl->pwt.luma_weight[i][list][0];
-            sl->pwt.luma_weight[16 + 2 * i][list][1] = sl->pwt.luma_weight[16 + 2 * i + 1][list][1] = sl->pwt.luma_weight[i][list][1];
-            for (j = 0; j < 2; j++) {
-                sl->pwt.chroma_weight[16 + 2 * i][list][j][0] = sl->pwt.chroma_weight[16 + 2 * i + 1][list][j][0] = sl->pwt.chroma_weight[i][list][j][0];
-                sl->pwt.chroma_weight[16 + 2 * i][list][j][1] = sl->pwt.chroma_weight[16 + 2 * i + 1][list][j][1] = sl->pwt.chroma_weight[i][list][j][1];
-            }
         }
     }
 }