[FFmpeg-cvslog] mpeg12enc: Don't set up run-level info for level 0.

[Alex Converse]

ffmpeg | branch: master | Alex Converse <alex.converse at gmail.com> | Thu Nov  3 15:56:37 2011 -0700| [7c5dfc174be59afa671a98ec85fe208c528ab64f] | committer: Alex Converse

mpeg12enc: Don't set up run-level info for level 0.

run: The number of zero coefficients preceding a non-zero coefficient,
in the scan order. The absolute value of the non-zero coefficient is
called "level".

The run-level code makes illegal reads when trying to set up tables for
nonsense level 0.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7c5dfc174be59afa671a98ec85fe208c528ab64f
---

 libavcodec/mpeg12enc.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/libavcodec/mpeg12enc.c b/libavcodec/mpeg12enc.c
index 5dedabd..26d26c7 100644
--- a/libavcodec/mpeg12enc.c
+++ b/libavcodec/mpeg12enc.c
@@ -74,6 +74,8 @@ static void init_uni_ac_vlc(RLTable *rl, uint8_t *uni_ac_vlc_len){
     for(i=0; i<128; i++){
         int level= i-64;
         int run;
+        if (!level)
+            continue;
         for(run=0; run<64; run++){
             int len, bits, code;