libavcodec/jpeg2000.c: Precinct size check removed

This patch removes a check which throws an error if
the log2 precinct width/height is 0. The standard allows
the first component to have 0 as the log2 width/height.
However, to ensure proper intialization of coding style,
an extra check has been added.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

libavcodec/jpeg2000.c

@@ -509,9 +509,6 @@ int ff_jpeg2000_init_component(Jpeg2000Component *comp,
         // update precincts size: 2^n value
         reslevel->log2_prec_width  = codsty->log2_prec_widths[reslevelno];
         reslevel->log2_prec_height = codsty->log2_prec_heights[reslevelno];
-        if (!reslevel->log2_prec_width || !reslevel->log2_prec_height) {
-            return AVERROR_INVALIDDATA;
-        }
 
         /* Number of bands for each resolution level */
         if (reslevelno == 0)

libavcodec/jpeg2000.h

@@ -144,6 +144,7 @@ typedef struct Jpeg2000CodingStyle {
     uint8_t prog_order;       // progression order
     uint8_t log2_prec_widths[JPEG2000_MAX_RESLEVELS];  // precincts size according resolution levels
     uint8_t log2_prec_heights[JPEG2000_MAX_RESLEVELS]; // TODO: initialize prec_size array with 0?
+    uint8_t init;
 } Jpeg2000CodingStyle;
 
 typedef struct Jpeg2000QuantStyle {

libavcodec/jpeg2000dec.c

@@ -567,7 +567,7 @@ static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 
     if ((ret = get_cox(s, &tmp)) < 0)
         return ret;
-
+    tmp.init = 1;
     for (compno = 0; compno < s->ncomponents; compno++)
         if (!(properties[compno] & HAD_COC))
             memcpy(c + compno, &tmp, sizeof(tmp));
@@ -605,6 +605,7 @@ static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
         return ret;
 
     properties[compno] |= HAD_COC;
+    c->init = 1;
     return 0;
 }
 
@@ -991,7 +992,8 @@ static int init_tile(Jpeg2000DecoderContext *s, int tileno)
 
         if (!comp->roi_shift)
             comp->roi_shift = s->roi_shift[compno];
-
+        if (!codsty->init)
+            return AVERROR_INVALIDDATA;
         if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
                                              s->cbps[compno], s->cdx[compno],
                                              s->cdy[compno], s->avctx))