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check norm6 vlc validity as there are some bit sequences which dont corespond to any codeword, the other vlc tables all seem to be huffman tables though

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Originally committed as revision 3883 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-01-25 01:29:10 +00:00
parent e5540b3fd3
commit 6b250f09e8
1 changed files with 4 additions and 0 deletions
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libavcodec/vc9.c
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@ -852,6 +852,10 @@ static int bitplane_decoding(BitPlane *bp, VC9Context *v)
for(y= bp->height%tile_h; y< bp->height; y+=tile_h){ for(y= bp->height%tile_h; y< bp->height; y+=tile_h){
for(x= bp->width%tile_w; x< bp->width; x+=tile_w){ for(x= bp->width%tile_w; x< bp->width; x+=tile_w){
code = get_vlc2(&v->gb, vc9_norm6_vlc.table, VC9_NORM6_VLC_BITS, 2); code = get_vlc2(&v->gb, vc9_norm6_vlc.table, VC9_NORM6_VLC_BITS, 2);
if(code<0){
av_log(v->avctx, AV_LOG_DEBUG, "inavlid NORM-6 VLC\n");
return -1;
}
//FIXME following is a pure guess and probably wrong //FIXME following is a pure guess and probably wrong
//FIXME A bitplane (0 | !0), so could the shifts be avoided ? //FIXME A bitplane (0 | !0), so could the shifts be avoided ?
planep[x + 0*bp->stride]= (code>>0)&1; planep[x + 0*bp->stride]= (code>>0)&1;