pqindex=0 is forbidden

Originally committed as revision 11540 to svn://svn.ffmpeg.org/ffmpeg/trunk
17 years ago · 95e3fdb846
parent 9ccbc672aa
commit 95e3fdb846
1 changed files with 2 additions and 0 deletions
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@ -1065,6 +1065,7 @@ static int vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)

    /* Quantizer stuff */
    pqindex = get_bits(gb, 5);
+    if(!pqindex) return -1;
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = ff_vc1_pquant_table[0][pqindex];
    else
@ -1301,6 +1302,7 @@ static int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
        }
    }
    pqindex = get_bits(gb, 5);
+    if(!pqindex) return -1;
    v->pqindex = pqindex;
    if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
        v->pq = ff_vc1_pquant_table[0][pqindex];