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flvdec: Check index for being valid 

Fixes seeking in Enigma_Principles_of_Lust.flv

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-12-29 23:22:41 +01:00
parent 00c0465dbc
commit df0bff6643
1 changed files with 10 additions and 1 deletions
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11
libavformat/flvdec.c
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@ -200,7 +200,16 @@ static int parse_keyframes_index(AVFormatContext *s, AVIOContext *ioc, AVStream
}
}
if (timeslen == fileposlen && fileposlen && max_pos <= filepositions[0]) {
if (timeslen == fileposlen && fileposlen>1 && max_pos <= filepositions[0]) {
int64_t dts, size0, size1;
avio_seek(ioc, filepositions[1]-4, SEEK_SET);
size0 = avio_rb32(ioc);
avio_r8(ioc);
size1 = avio_rb24(ioc);
dts = avio_rb24(ioc);
dts |= avio_r8(ioc) << 24;
if (size0 > filepositions[1] || FFABS(dts - times[1]*1000)>5000)
goto finish;
for(i = 0; i < timeslen; i++)
av_add_index_entry(vstream, filepositions[i], times[i]*1000, 0, 0, AVINDEX_KEYFRAME);
} else