avcodec/jpeg2000dec: Support progression order changes

Fixes Ticket4657
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/jpeg2000.c

@@ -391,6 +391,8 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
                 Jpeg2000Prec *prec = band->prec + precno;
                 int nb_codeblocks;
 
+                prec->decoded_layers = 0;
+
                 /* TODO: Explain formula for JPEG200 DCINEMA. */
                 /* TODO: Verify with previous count of codeblocks per band */
 

libavcodec/jpeg2000.h

@@ -183,6 +183,7 @@ typedef struct Jpeg2000Prec {
     Jpeg2000TgtNode *zerobits;
     Jpeg2000TgtNode *cblkincl;
     Jpeg2000Cblk *cblk;
+    int decoded_layers;
     uint16_t coord[2][2]; // border coordinates {{x0, x1}, {y0, y1}}
 } Jpeg2000Prec; // precinct