avcodec/jpeg2000dec: Implement "Reset context probabilities on coding pass boundaries"

No testcase with just this feature known
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/jpeg2000dec.c

@@ -1335,6 +1335,9 @@ static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
                            vert_causal_ctx_csty_symbol);
             break;
         }
+        if (codsty->cblk_style & JPEG2000_CBLK_RESET) // XXX no testcase for just this
+            ff_mqc_init_contexts(&t1->mqc);
+
         if ((coder_type = needs_termination(codsty->cblk_style, pass_cnt))) {
             if (term_cnt >= cblk->nb_terminations) {
                 av_log(s->avctx, AV_LOG_ERROR, "Missing needed termination \n");