vc1: simplify *_use_ic initialization

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/vc1.c

@@ -596,24 +596,20 @@ static void rotate_luts(VC1Context *v)
             C = A;                                            \
         } else {                                              \
             DEF;                                              \
-            memcpy(&tmp, &L  , sizeof(tmp));                  \
+            memcpy(&tmp, L   , sizeof(tmp));                  \
-            memcpy(&L  , &N  , sizeof(tmp));                  \
+            memcpy(L   , N   , sizeof(tmp));                  \
-            memcpy(&N  , &tmp, sizeof(tmp));                  \
+            memcpy(N   , &tmp, sizeof(tmp));                  \
             C = N;                                            \
         }                                                     \
     } while(0)
 
-    ROTATE(int tmp,             v->last_use_ic, v->next_use_ic, v->curr_use_ic, v->aux_use_ic);
+    ROTATE(int *tmp,            &v->last_use_ic, &v->next_use_ic, v->curr_use_ic, &v->aux_use_ic);
     ROTATE(uint8_t tmp[2][256], v->last_luty,   v->next_luty,   v->curr_luty,   v->aux_luty);
     ROTATE(uint8_t tmp[2][256], v->last_lutuv,  v->next_lutuv,  v->curr_lutuv,  v->aux_lutuv);
 
     INIT_LUT(32, 0, v->curr_luty[0], v->curr_lutuv[0], 0);
     INIT_LUT(32, 0, v->curr_luty[1], v->curr_lutuv[1], 0);
-    v->curr_use_ic = 0;
+    *v->curr_use_ic = 0;
-    if (v->curr_luty == v->next_luty) {
-        // If we just initialized next_lut, clear next_use_ic to match.
-        v->next_use_ic = 0;
-    }
 }
 
 int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
@@ -1108,7 +1104,7 @@ int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                         INIT_LUT(v->lumscale2, v->lumshift2, v->curr_luty[v->cur_field_type^1], v->curr_lutuv[v->cur_field_type^1], 0);
                         INIT_LUT(v->lumscale , v->lumshift , v->last_luty[v->cur_field_type  ], v->last_lutuv[v->cur_field_type  ], 1);
                     }
-                    v->next_use_ic = v->curr_use_ic = 1;
+                    v->next_use_ic = *v->curr_use_ic = 1;
                 } else {
                     INIT_LUT(v->lumscale , v->lumshift , v->last_luty[0], v->last_lutuv[0], 1);
                     INIT_LUT(v->lumscale2, v->lumshift2, v->last_luty[1], v->last_lutuv[1], 1);

libavcodec/vc1.h

@@ -315,7 +315,7 @@ typedef struct VC1Context{
     uint8_t  aux_luty[2][256],  aux_lutuv[2][256];  ///< lookup tables used for intensity compensation
     uint8_t next_luty[2][256], next_lutuv[2][256];  ///< lookup tables used for intensity compensation
     uint8_t (*curr_luty)[256]  ,(*curr_lutuv)[256];
-    int last_use_ic, curr_use_ic, next_use_ic, aux_use_ic;
+    int last_use_ic, *curr_use_ic, next_use_ic, aux_use_ic;
     int rnd;                        ///< rounding control
 
     /** Frame decoding info for S/M profiles only */

libavcodec/vc1dec.c

@@ -377,7 +377,7 @@ static void vc1_mc_1mv(VC1Context *v, int dir)
             srcV = s->current_picture.f.data[2];
             luty  = v->curr_luty;
             lutuv = v->curr_lutuv;
-            use_ic = v->curr_use_ic;
+            use_ic = *v->curr_use_ic;
         } else {
             srcY = s->last_picture.f.data[0];
             srcU = s->last_picture.f.data[1];
@@ -571,7 +571,7 @@ static void vc1_mc_4mv_luma(VC1Context *v, int n, int dir, int avg)
         if (v->field_mode && (v->cur_field_type != v->ref_field_type[dir]) && v->second_field) {
             srcY = s->current_picture.f.data[0];
             luty = v->curr_luty;
-            use_ic = v->curr_use_ic;
+            use_ic = *v->curr_use_ic;
         } else {
             srcY = s->last_picture.f.data[0];
             luty = v->last_luty;
@@ -873,7 +873,7 @@ static void vc1_mc_4mv_chroma(VC1Context *v, int dir)
             srcU = s->current_picture.f.data[1];
             srcV = s->current_picture.f.data[2];
             lutuv = v->curr_lutuv;
-            use_ic = v->curr_use_ic;
+            use_ic = *v->curr_use_ic;
         } else {
             srcU = s->last_picture.f.data[1];
             srcV = s->last_picture.f.data[2];