libavcodec/jpeg2000dec: Enhance pix fmt selection

This patch assigns default pix format values when
a match does not take place.

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

libavcodec/jpeg2000dec.c

@@ -436,6 +436,18 @@ static int get_siz(Jpeg2000DecoderContext *s)
                 s->cdef[3] = 3;
                 i = 0;
             }
+        } else if (ncomponents == 3 && s->precision == 8 &&
+                   s->cdx[0] == s->cdx[1] && s->cdx[0] == s->cdx[2] &&
+                   s->cdy[0] == s->cdy[1] && s->cdy[0] == s->cdy[2]) {
+            s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
+            i = 0;
+        } else if (ncomponents == 2 && s->precision == 8 &&
+                   s->cdx[0] == s->cdx[1] && s->cdy[0] == s->cdy[1]) {
+            s->avctx->pix_fmt = AV_PIX_FMT_YA8;
+            i = 0;
+        } else if (ncomponents == 1 && s->precision == 8) {
+            s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
+            i = 0;
         }
     }