h264: move {prev,next}_mb_skipped into the per-slice context

libavcodec/h264.h

@@ -314,6 +314,9 @@ typedef struct H264SliceContext {
     int luma_weight[48][2][2];
     int chroma_weight[48][2][2][2];
     int implicit_weight[48][48][2];
+
+    int prev_mb_skipped;
+    int next_mb_skipped;
 } H264SliceContext;
 
 /**
@@ -350,9 +353,6 @@ typedef struct H264Context {
     int flags;
     int workaround_bugs;
 
-    int prev_mb_skipped;
-    int next_mb_skipped;
-
     // prediction stuff
     int chroma_pred_mode;
     int intra16x16_pred_mode;

libavcodec/h264_cabac.c

@@ -1897,16 +1897,16 @@ int ff_h264_decode_mb_cabac(H264Context *h, H264SliceContext *sl)
     if( h->slice_type_nos != AV_PICTURE_TYPE_I ) {
         int skip;
         /* a skipped mb needs the aff flag from the following mb */
-        if (FRAME_MBAFF(h) && (h->mb_y & 1) == 1 && h->prev_mb_skipped)
-            skip = h->next_mb_skipped;
+        if (FRAME_MBAFF(h) && (h->mb_y & 1) == 1 && sl->prev_mb_skipped)
+            skip = sl->next_mb_skipped;
         else
             skip = decode_cabac_mb_skip( h, h->mb_x, h->mb_y );
         /* read skip flags */
         if( skip ) {
             if (FRAME_MBAFF(h) && (h->mb_y & 1) == 0) {
                 h->cur_pic.mb_type[mb_xy] = MB_TYPE_SKIP;
-                h->next_mb_skipped = decode_cabac_mb_skip( h, h->mb_x, h->mb_y+1 );
-                if(!h->next_mb_skipped)
+                sl->next_mb_skipped = decode_cabac_mb_skip( h, h->mb_x, h->mb_y+1 );
+                if(!sl->next_mb_skipped)
                     h->mb_mbaff = h->mb_field_decoding_flag = decode_cabac_field_decoding_flag(h);
             }
 
@@ -1926,7 +1926,7 @@ int ff_h264_decode_mb_cabac(H264Context *h, H264SliceContext *sl)
             h->mb_field_decoding_flag = decode_cabac_field_decoding_flag(h);
     }
 
-    h->prev_mb_skipped = 0;
+    sl->prev_mb_skipped = 0;
 
     fill_decode_neighbors(h, -(MB_FIELD(h)));
 

libavcodec/h264_cavlc.c

@@ -721,7 +721,7 @@ int ff_h264_decode_mb_cavlc(H264Context *h, H264SliceContext *sl)
             h->mb_mbaff = h->mb_field_decoding_flag = get_bits1(&h->gb);
     }
 
-    h->prev_mb_skipped= 0;
+    sl->prev_mb_skipped = 0;
 
     mb_type= get_ue_golomb(&h->gb);
     if(h->slice_type_nos == AV_PICTURE_TYPE_B){

libavcodec/h264_mvpred.h

@@ -824,7 +824,7 @@ static void av_unused decode_mb_skip(H264Context *h, H264SliceContext *sl)
     h->cur_pic.mb_type[mb_xy]      = mb_type;
     h->cur_pic.qscale_table[mb_xy] = sl->qscale;
     h->slice_table[mb_xy]            = h->slice_num;
-    h->prev_mb_skipped               = 1;
+    sl->prev_mb_skipped            = 1;
 }
 
 #endif /* AVCODEC_H264_MVPRED_H */