avcodec/jpeg2000: Remove CBLK limit

This also reduces the amount of memory needed
Fixes Ticket4672

The new code seems slightly faster as well, probably due to better cache usage
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/jpeg2000.c

@@ -171,22 +171,22 @@ void ff_jpeg2000_set_significance(Jpeg2000T1Context *t1, int x, int y,
 {
     x++;
     y++;
-    t1->flags[y][x] |= JPEG2000_T1_SIG;
+    t1->flags[(y) * t1->stride + x] |= JPEG2000_T1_SIG;
     if (negative) {
-        t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;
-        t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;
-        t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;
-        t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;
+        t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W | JPEG2000_T1_SGN_W;
+        t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E | JPEG2000_T1_SGN_E;
+        t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N | JPEG2000_T1_SGN_N;
+        t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S | JPEG2000_T1_SGN_S;
     } else {
-        t1->flags[y][x + 1] |= JPEG2000_T1_SIG_W;
-        t1->flags[y][x - 1] |= JPEG2000_T1_SIG_E;
-        t1->flags[y + 1][x] |= JPEG2000_T1_SIG_N;
-        t1->flags[y - 1][x] |= JPEG2000_T1_SIG_S;
+        t1->flags[(y) * t1->stride + x + 1] |= JPEG2000_T1_SIG_W;
+        t1->flags[(y) * t1->stride + x - 1] |= JPEG2000_T1_SIG_E;
+        t1->flags[(y + 1) * t1->stride + x] |= JPEG2000_T1_SIG_N;
+        t1->flags[(y - 1) * t1->stride + x] |= JPEG2000_T1_SIG_S;
     }
-    t1->flags[y + 1][x + 1] |= JPEG2000_T1_SIG_NW;
-    t1->flags[y + 1][x - 1] |= JPEG2000_T1_SIG_NE;
-    t1->flags[y - 1][x + 1] |= JPEG2000_T1_SIG_SW;
-    t1->flags[y - 1][x - 1] |= JPEG2000_T1_SIG_SE;
+    t1->flags[(y + 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_NW;
+    t1->flags[(y + 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_NE;
+    t1->flags[(y - 1) * t1->stride + x + 1] |= JPEG2000_T1_SIG_SW;
+    t1->flags[(y - 1) * t1->stride + x - 1] |= JPEG2000_T1_SIG_SE;
 }
 
 static const uint8_t lut_gain[2][4] = { { 0, 0, 0, 0 }, { 0, 1, 1, 2 } };

libavcodec/jpeg2000.h

@@ -67,10 +67,6 @@ enum Jpeg2000Quantsty { // quantization style
     JPEG2000_QSTY_SE    // scalar expounded
 };
 
-#define JPEG2000_MAX_CBLKW 128
-#define JPEG2000_MAX_CBLKH 128
-
-
 #define JPEG2000_MAX_DECLEVELS 32
 #define JPEG2000_MAX_RESLEVELS (JPEG2000_MAX_DECLEVELS + 1)
 
@@ -123,9 +119,10 @@ enum Jpeg2000Quantsty { // quantization style
 #define JPEG2000_PGOD_CPRL      0x04  // Component-position-resolution level-layer progression
 
 typedef struct Jpeg2000T1Context {
-    int data[JPEG2000_MAX_CBLKW][JPEG2000_MAX_CBLKH];
-    uint16_t flags[JPEG2000_MAX_CBLKW + 2][JPEG2000_MAX_CBLKH + 2];
+    int data[6144];
+    uint16_t flags[6156];
     MqcState mqc;
+    int stride;
 } Jpeg2000T1Context;
 
 typedef struct Jpeg2000TgtNode {