intrax8: Keep a reference to the decoder blocks

libavcodec/intrax8.c

@@ -480,9 +480,8 @@ static void x8_get_prediction(IntraX8Context *const w)
 static void x8_ac_compensation(IntraX8Context *const w, const int direction,
                                const int dc_level)
 {
-    MpegEncContext *const s = w->s;
     int t;
-#define B(x, y) s->block[0][w->idsp.idct_permutation[(x) + (y) * 8]]
+#define B(x, y) w->block[0][w->idsp.idct_permutation[(x) + (y) * 8]]
 #define T(x)  ((x) * dc_level + 0x8000) >> 16;
     switch (direction) {
     case 0:
@@ -526,7 +525,7 @@ static void x8_ac_compensation(IntraX8Context *const w, const int direction,
         t        = T(1084); // g
         B(1, 1) += t;
 
-        s->block_last_index[0] = FFMAX(s->block_last_index[0], 7 * 8);
+        w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
         break;
     case 1:
         B(0, 1) -= T(6269);
@@ -534,7 +533,7 @@ static void x8_ac_compensation(IntraX8Context *const w, const int direction,
         B(0, 5) -= T(172);
         B(0, 7) -= T(73);
 
-        s->block_last_index[0] = FFMAX(s->block_last_index[0], 7 * 8);
+        w->block_last_index[0] = FFMAX(w->block_last_index[0], 7 * 8);
         break;
     case 2:
         B(1, 0) -= T(6269);
@@ -542,7 +541,7 @@ static void x8_ac_compensation(IntraX8Context *const w, const int direction,
         B(5, 0) -= T(172);
         B(7, 0) -= T(73);
 
-        s->block_last_index[0] = FFMAX(s->block_last_index[0], 7);
+        w->block_last_index[0] = FFMAX(w->block_last_index[0], 7);
         break;
     }
 #undef B
@@ -572,8 +571,6 @@ static const int16_t quant_table[64] = {
 
 static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
 {
-    MpegEncContext *const s = w->s;
-
     uint8_t *scantable;
     int final, run, level;
     int ac_mode, dc_mode, est_run, dc_level;
@@ -583,7 +580,7 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
     int sign;
 
     assert(w->orient < 12);
-    w->bdsp.clear_block(s->block[0]);
+    w->bdsp.clear_block(w->block[0]);
 
     if (chroma)
         dc_mode = 2;
@@ -644,12 +641,12 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
             if (use_quant_matrix)
                 level = (level * quant_table[pos]) >> 8;
 
-            s->block[0][scantable[pos]] = level;
+            w->block[0][scantable[pos]] = level;
         } while (!final);
 
-        s->block_last_index[0] = pos;
+        w->block_last_index[0] = pos;
     } else { // DC only
-        s->block_last_index[0] = 0;
+        w->block_last_index[0] = 0;
         if (w->flat_dc && ((unsigned) (dc_level + 1)) < 3) { // [-1; 1]
             int32_t divide_quant = !chroma ? w->divide_quant_dc_luma
                                            : w->divide_quant_dc_chroma;
@@ -669,9 +666,9 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
         zeros_only = (dc_level == 0);
     }
     if (!chroma)
-        s->block[0][0] = dc_level * w->quant;
+        w->block[0][0] = dc_level * w->quant;
     else
-        s->block[0][0] = dc_level * w->quant_dc_chroma;
+        w->block[0][0] = dc_level * w->quant_dc_chroma;
 
     // there is !zero_only check in the original, but dc_level check is enough
     if ((unsigned int) (dc_level + 1) >= 3 && (w->edges & 3) != 3) {
@@ -681,7 +678,7 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
         direction = (0x6A017C >> (w->orient * 2)) & 3;
         if (direction != 3) {
             // modify block_last[]
-            x8_ac_compensation(w, direction, s->block[0][0]);
+            x8_ac_compensation(w, direction, w->block[0][0]);
         }
     }
 
@@ -696,7 +693,7 @@ static int x8_decode_intra_mb(IntraX8Context *const w, const int chroma)
     if (!zeros_only)
         w->idsp.idct_add(w->dest[chroma],
                          w->frame->linesize[!!chroma],
-                         s->block[0]);
+                         w->block[0]);
 
 block_placed:
     if (!chroma)
@@ -735,6 +732,8 @@ static void x8_init_block_index(IntraX8Context *w, AVFrame *frame)
 
 av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
                                    IntraX8Context *w, IDCTDSPContext *idsp,
+                                   int16_t (*block)[64],
+                                   int block_last_index[12],
                                    int mb_width, int mb_height,
                                    MpegEncContext *const s)
 {
@@ -746,6 +745,8 @@ av_cold int ff_intrax8_common_init(AVCodecContext *avctx,
     w->idsp = *idsp;
     w->mb_width  = mb_width;
     w->mb_height = mb_height;
+    w->block = block;
+    w->block_last_index = block_last_index;
     w->s = s;
 
     // two rows, 2 blocks per cannon mb

libavcodec/intrax8.h

@@ -37,6 +37,8 @@ typedef struct IntraX8Context {
     uint8_t *prediction_table; // 2 * (mb_w * 2)
     ScanTable scantable[3];
     AVCodecContext *avctx;
+    int *block_last_index;  ///< last nonzero coefficient in block
+    int16_t (*block)[64];
 
     // set by the caller codec
     MpegEncContext *s;
@@ -77,6 +79,8 @@ typedef struct IntraX8Context {
  * @param avctx pointer to AVCodecContext
  * @param w pointer to IntraX8Context
  * @param idsp pointer to IDCTDSPContext
+ * @param block pointer to block array
+ * @param block_last_index pointer to index array
  * @param mb_width macroblock width
  * @param mb_height macroblock height
  * @param s pointer to MpegEncContext of the parent codec
@@ -84,6 +88,8 @@ typedef struct IntraX8Context {
  */
 int ff_intrax8_common_init(AVCodecContext *avctx,
                            IntraX8Context *w, IDCTDSPContext *idsp,
+                           int16_t (*block)[64],
+                           int block_last_index[12],
                            int mb_width, int mb_height,
                            MpegEncContext *const s);
 

libavcodec/vc1dec.c

@@ -380,6 +380,7 @@ av_cold int ff_vc1_decode_init_alloc_tables(VC1Context *v)
     }
 
     ret = ff_intrax8_common_init(s->avctx, &v->x8, &s->idsp,
+                                 s->block, s->block_last_index,
                                  s->mb_width, s->mb_height,
                                  s);
     if (ret < 0)

libavcodec/wmv2dec.c

@@ -475,6 +475,7 @@ static av_cold int wmv2_decode_init(AVCodecContext *avctx)
     ff_wmv2_common_init(w);
 
     return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
+                                  w->s.block, w->s.block_last_index,
                                   w->s.mb_width, w->s.mb_height, &w->s);
 }