[FFmpeg-cvslog] mpeg4videodec: Force quant_precision to stay within the valid range.

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Apr  7 19:53:51 2012 +0200| [50ec8a2acd4f7ad422c0883153b856e737adf973] | committer: Michael Niedermayer

mpeg4videodec: Force quant_precision to stay within the valid range.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=50ec8a2acd4f7ad422c0883153b856e737adf973
---

 libavcodec/mpeg4videodec.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
index 99aecbb..43e9d32 100644
--- a/libavcodec/mpeg4videodec.c
+++ b/libavcodec/mpeg4videodec.c
@@ -1674,6 +1674,9 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
             s->quant_precision = get_bits(gb, 4); /* quant_precision */
             if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
             if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
+            if(s->quant_precision<3 || s->quant_precision>9) {
+                s->quant_precision = 5;
+            }
         } else {
             s->quant_precision = 5;
         }