jpeg2000: Drop unused and writeonly fields

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/jpeg2000.h

@@ -136,8 +136,6 @@ typedef struct Jpeg2000CodingStyle {
             log2_cblk_height; // exponent of codeblock size
     uint8_t transform;        // DWT type
     uint8_t csty;             // coding style
-    uint8_t log2_prec_width,
-            log2_prec_height; // precinct size
     uint8_t nlayers;          // number of layers
     uint8_t mct;              // multiple component transformation
     uint8_t cblk_style;       // codeblock coding style
@@ -172,7 +170,6 @@ typedef struct Jpeg2000Cblk {
 } Jpeg2000Cblk; // code block
 
 typedef struct Jpeg2000Prec {
-    uint16_t xi0, yi0; // codeblock indexes ([xi0, xi1))
     uint16_t nb_codeblocks_width;
     uint16_t nb_codeblocks_height;
     Jpeg2000TgtNode *zerobits;
@@ -186,7 +183,6 @@ typedef struct Jpeg2000Prec {
 typedef struct Jpeg2000Band {
     uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
     uint16_t log2_cblk_width, log2_cblk_height;
-    uint16_t cblknx, cblkny;
     float stepsize; // quantization stepsize
     Jpeg2000Prec *prec;
 } Jpeg2000Band; // subband

libavcodec/jpeg2000dec.c

@@ -318,6 +318,9 @@ static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
             c->log2_prec_widths[i]  =  byte       & 0x0F;    // precinct PPx
             c->log2_prec_heights[i] = (byte >> 4) & 0x0F;    // precinct PPy
         }
+    } else {
+        memset(c->log2_prec_widths , 15, sizeof(c->log2_prec_widths ));
+        memset(c->log2_prec_heights, 15, sizeof(c->log2_prec_heights));
     }
     return 0;
 }
@@ -332,9 +335,6 @@ static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
     if (bytestream2_get_bytes_left(&s->g) < 5)
         return AVERROR_INVALIDDATA;
 
-    tmp.log2_prec_width  =
-    tmp.log2_prec_height = 15;
-
     tmp.csty = bytestream2_get_byteu(&s->g);
 
     // get progression order
@@ -650,8 +650,6 @@ static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
         if (band->coord[0][0] == band->coord[0][1] ||
             band->coord[1][0] == band->coord[1][1])
             continue;
-        prec->yi0 = 0;
-        prec->xi0 = 0;
         nb_code_blocks =  prec->nb_codeblocks_height *
                           prec->nb_codeblocks_width;
         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {