diff --git a/libavcodec/vc1_block.c b/libavcodec/vc1_block.c
index b58b71b3e0..a2321eddb9 100644
--- a/libavcodec/vc1_block.c
+++ b/libavcodec/vc1_block.c
@@ -45,6 +45,9 @@ static const uint8_t offset_table[2][9] = {
     {  0,  1,  3,  7, 15, 31, 63, 127, 255 },
 };
 
+// mapping table for internal block representation
+static const int block_map[6] = {0, 2, 1, 3, 4, 5};
+
 /***********************************************************************/
 /**
  * @name VC-1 Bitplane decoding
@@ -86,11 +89,11 @@ static void vc1_put_blocks_clamped(VC1Context *v, int put_signed)
                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i] - 2]) {
                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + ((i & 1) - 2) * 8;
                     if (put_signed)
-                        s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][i],
+                        s->idsp.put_signed_pixels_clamped(v->block[v->topleft_blk_idx][block_map[i]],
                                                           i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
                                                           i > 3 ? s->uvlinesize : s->linesize);
                     else
-                        s->idsp.put_pixels_clamped(v->block[v->topleft_blk_idx][i],
+                        s->idsp.put_pixels_clamped(v->block[v->topleft_blk_idx][block_map[i]],
                                                    i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize - 8 : dest,
                                                    i > 3 ? s->uvlinesize : s->linesize);
                 }
@@ -102,11 +105,11 @@ static void vc1_put_blocks_clamped(VC1Context *v, int put_signed)
                             v->mb_type[0][s->block_index[i] - 2 * s->block_wrap[i]]) {
                     dest = s->dest[0] + ((i & 2) - 4) * 4 * s->linesize + (i & 1) * 8;
                     if (put_signed)
-                        s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][i],
+                        s->idsp.put_signed_pixels_clamped(v->block[v->top_blk_idx][block_map[i]],
                                                           i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
                                                           i > 3 ? s->uvlinesize : s->linesize);
                     else
-                        s->idsp.put_pixels_clamped(v->block[v->top_blk_idx][i],
+                        s->idsp.put_pixels_clamped(v->block[v->top_blk_idx][block_map[i]],
                                                    i > 3 ? s->dest[i - 3] - 8 * s->uvlinesize : dest,
                                                    i > 3 ? s->uvlinesize : s->linesize);
                 }
@@ -125,11 +128,11 @@ static void vc1_put_blocks_clamped(VC1Context *v, int put_signed)
                     else
                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + ((i & 1) - 2) * 8;
                     if (put_signed)
-                        s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][i],
+                        s->idsp.put_signed_pixels_clamped(v->block[v->left_blk_idx][block_map[i]],
                                                           i > 3 ? s->dest[i - 3] - 8 : dest,
                                                           i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                     else
-                        s->idsp.put_pixels_clamped(v->block[v->left_blk_idx][i],
+                        s->idsp.put_pixels_clamped(v->block[v->left_blk_idx][block_map[i]],
                                                    i > 3 ? s->dest[i - 3] - 8 : dest,
                                                    i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                 }
@@ -145,11 +148,11 @@ static void vc1_put_blocks_clamped(VC1Context *v, int put_signed)
                     else
                         dest = s->dest[0] + (i & 2) * 4 * s->linesize + (i & 1) * 8;
                     if (put_signed)
-                        s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][i],
+                        s->idsp.put_signed_pixels_clamped(v->block[v->cur_blk_idx][block_map[i]],
                                                           i > 3 ? s->dest[i - 3] : dest,
                                                           i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                     else
-                        s->idsp.put_pixels_clamped(v->block[v->cur_blk_idx][i],
+                        s->idsp.put_pixels_clamped(v->block[v->cur_blk_idx][block_map[i]],
                                                    i > 3 ? s->dest[i - 3] : dest,
                                                    i > 3 ? s->uvlinesize : s->linesize << fieldtx);
                 }
@@ -1348,18 +1351,18 @@ static int vc1_decode_p_mb(VC1Context *v)
                     if (i == 1 || i == 3 || s->mb_x)
                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                            (i & 4) ? v->codingset2 : v->codingset);
                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                         continue;
-                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                     if (v->rangeredfrm)
                         for (j = 0; j < 64; j++)
-                            v->block[v->cur_blk_idx][i][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
                     block_cbp   |= 0xF << (i << 2);
                     block_intra |= 1 << i;
                 } else if (val) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb, first_block,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb, first_block,
                                              s->dest[dst_idx] + off, (i & 4) ? s->uvlinesize : s->linesize,
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
                     block_cbp |= pat << (i << 2);
@@ -1449,18 +1452,18 @@ static int vc1_decode_p_mb(VC1Context *v)
                     if (i == 1 || i == 3 || s->mb_x)
                         v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, is_coded[i], mquant,
+                    vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, is_coded[i], mquant,
                                            (i & 4) ? v->codingset2 : v->codingset);
                     if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                         continue;
-                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                    v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                     if (v->rangeredfrm)
                         for (j = 0; j < 64; j++)
-                            v->block[v->cur_blk_idx][i][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[i]][j] <<= 1;
                     block_cbp   |= 0xF << (i << 2);
                     block_intra |= 1 << i;
                 } else if (is_coded[i]) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                              first_block, s->dest[dst_idx] + off,
                                              (i & 4) ? s->uvlinesize : s->linesize,
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
@@ -1591,11 +1594,11 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
                 if (i == 1 || i == 3 || s->mb_x)
                     v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-                vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+                vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                        (i & 4) ? v->codingset2 : v->codingset);
                 if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
                 if (i < 4)
                     off = (fieldtx) ? ((i & 1) * 8) + ((i & 2) >> 1) * s->linesize : (i & 1) * 8 + 4 * (i & 2) * s->linesize;
                 else
@@ -1671,7 +1674,7 @@ static int vc1_decode_p_mb_intfr(VC1Context *v)
                 else
                     off = (i & 4) ? 0 : ((i & 1) * 8 + ((i > 1) * s->linesize));
                 if (val) {
-                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                    pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                              first_block, s->dest[dst_idx] + off,
                                              (i & 4) ? s->uvlinesize : (s->linesize << fieldtx),
                                              CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY), &block_tt);
@@ -1757,11 +1760,11 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
             if (i == 1 || i == 3 || s->mb_x)
                 v->c_avail = v->mb_type[0][s->block_index[i] - 1];
 
-            vc1_decode_intra_block(v, v->block[v->cur_blk_idx][i], i, val, mquant,
+            vc1_decode_intra_block(v, v->block[v->cur_blk_idx][block_map[i]], i, val, mquant,
                                    (i & 4) ? v->codingset2 : v->codingset);
             if (CONFIG_GRAY && (i > 3) && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                 continue;
-            v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][i]);
+            v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[i]]);
             off  = (i & 4) ? 0 : ((i & 1) * 8 + (i & 2) * 4 * s->linesize);
             block_cbp |= 0xf << (i << 2);
         }
@@ -1806,7 +1809,7 @@ static int vc1_decode_p_mb_intfi(VC1Context *v)
             val = ((cbp >> (5 - i)) & 1);
             off = (i & 4) ? 0 : (i & 1) * 8 + (i & 2) * 4 * s->linesize;
             if (val) {
-                pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][i], i, mquant, ttmb,
+                pat = vc1_decode_p_block(v, v->block[v->cur_blk_idx][block_map[i]], i, mquant, ttmb,
                                          first_block, s->dest[dst_idx] + off,
                                          (i & 4) ? s->uvlinesize : s->linesize,
                                          CONFIG_GRAY && (i & 4) && (s->avctx->flags & AV_CODEC_FLAG_GRAY),
@@ -2541,9 +2544,8 @@ static void vc1_decode_i_blocks(VC1Context *v)
         s->mb_x = 0;
         init_block_index(v);
         for (; s->mb_x < v->end_mb_x; s->mb_x++) {
-            int16_t (*block)[64] = v->block[v->cur_blk_idx];
             ff_update_block_index(s);
-            s->bdsp.clear_blocks(block[0]);
+            s->bdsp.clear_blocks(v->block[v->cur_blk_idx][0]);
             mb_pos = s->mb_x + s->mb_y * s->mb_width;
             s->current_picture.mb_type[mb_pos]                     = MB_TYPE_INTRA;
             s->current_picture.qscale_table[mb_pos]                = v->pq;
@@ -2568,11 +2570,11 @@ static void vc1_decode_i_blocks(VC1Context *v)
                 }
                 cbp |= val << (5 - k);
 
-                vc1_decode_i_block(v, block[k], k, val, (k < 4) ? v->codingset : v->codingset2);
+                vc1_decode_i_block(v, v->block[v->cur_blk_idx][block_map[k]], k, val, (k < 4) ? v->codingset : v->codingset2);
 
                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(block[k]);
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[k]]);
             }
 
             if (v->overlap && v->pq >= 9) {
@@ -2580,13 +2582,13 @@ static void vc1_decode_i_blocks(VC1Context *v)
                 if (v->rangeredfrm)
                     for (k = 0; k < 6; k++)
                         for (j = 0; j < 64; j++)
-                            block[k][j] <<= 1;
+                            v->block[v->cur_blk_idx][block_map[k]][j] <<= 1;
                 vc1_put_blocks_clamped(v, 1);
             } else {
                 if (v->rangeredfrm)
                     for (k = 0; k < 6; k++)
                         for (j = 0; j < 64; j++)
-                            block[k][j] = (block[k][j] - 64) << 1;
+                            v->block[v->cur_blk_idx][block_map[k]][j] = (v->block[v->cur_blk_idx][block_map[k]][j] - 64) << 1;
                 vc1_put_blocks_clamped(v, 0);
             }
 
@@ -2673,10 +2675,9 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
         s->mb_x = 0;
         init_block_index(v);
         for (;s->mb_x < s->mb_width; s->mb_x++) {
-            int16_t (*block)[64] = v->block[v->cur_blk_idx];
             mquant = v->pq;
             ff_update_block_index(s);
-            s->bdsp.clear_blocks(block[0]);
+            s->bdsp.clear_blocks(v->block[v->cur_blk_idx][0]);
             mb_pos = s->mb_x + s->mb_y * s->mb_stride;
             s->current_picture.mb_type[mb_pos + v->mb_off]                         = MB_TYPE_INTRA;
             for (int i = 0; i < 4; i++) {
@@ -2718,12 +2719,12 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
                 v->a_avail = !s->first_slice_line || (k == 2 || k == 3);
                 v->c_avail = !!s->mb_x || (k == 1 || k == 3);
 
-                vc1_decode_i_block_adv(v, block[k], k, val,
+                vc1_decode_i_block_adv(v, v->block[v->cur_blk_idx][block_map[k]], k, val,
                                        (k < 4) ? v->codingset : v->codingset2, mquant);
 
                 if (CONFIG_GRAY && k > 3 && (s->avctx->flags & AV_CODEC_FLAG_GRAY))
                     continue;
-                v->vc1dsp.vc1_inv_trans_8x8(block[k]);
+                v->vc1dsp.vc1_inv_trans_8x8(v->block[v->cur_blk_idx][block_map[k]]);
             }
 
             if (v->overlap && (v->pq >= 9 || v->condover != CONDOVER_NONE))
