jpeg2000: Define the maximum decomposition levels

And define the resolution levels according.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/jpeg2000.h

@@ -67,7 +67,9 @@ enum Jpeg2000Quantsty { // quantization style
 #define JPEG2000_MAX_CBLKW 64
 #define JPEG2000_MAX_CBLKH 64
 
-#define JPEG2000_MAX_RESLEVELS 33
+
+#define JPEG2000_MAX_DECLEVELS 32
+#define JPEG2000_MAX_RESLEVELS (JPEG2000_MAX_DECLEVELS + 1)
 
 // T1 flags
 // flags determining significance of neighbor coefficients
@@ -145,8 +147,8 @@ typedef struct Jpeg2000CodingStyle {
 } Jpeg2000CodingStyle;
 
 typedef struct Jpeg2000QuantStyle {
-    uint8_t expn[32 * 3];  // quantization exponent
-    uint32_t mant[32 * 3]; // quantization mantissa
+    uint8_t expn[JPEG2000_MAX_DECLEVELS * 3];  // quantization exponent
+    uint32_t mant[JPEG2000_MAX_DECLEVELS * 3]; // quantization mantissa
     uint8_t quantsty;      // quantization style
     uint8_t nguardbits;    // number of guard bits
 } Jpeg2000QuantStyle;

libavcodec/jpeg2000dec.c

@@ -367,7 +367,7 @@ static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
         x          = bytestream_get_be16(&s->buf);
         q->expn[0] = x >> 11;
         q->mant[0] = x & 0x7ff;
-        for (i = 1; i < 32 * 3; i++) {
+        for (i = 1; i < JPEG2000_MAX_DECLEVELS * 3; i++) {
             int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
             q->expn[i] = curexpn;
             q->mant[i] = q->mant[0];