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matroskaenc: fix cue tracknum off by 1 error

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Fixes out of array accesses

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-23 23:05:44 +01:00
parent 73fce258b7
commit 285485ac5f
1 changed files with 4 additions and 2 deletions
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6
libavformat/matroskaenc.c
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@ -407,9 +407,11 @@ static int64_t mkv_write_cues(AVIOContext *pb, mkv_cues *cues, mkv_track *tracks
for (j = 0; j < num_tracks; j++)
tracks[j].has_cue = 0;
for (j = 0; j < cues->num_entries - i && entry[j].pts == pts; j++) {
if (tracks[entry[j].tracknum].has_cue)
int tracknum = entry[j].tracknum - 1;
av_assert0(tracknum>=0 && tracknum<num_tracks);
if (tracks[tracknum].has_cue)
continue;
tracks[entry[j].tracknum].has_cue = 1;
tracks[tracknum].has_cue = 1;
track_positions = start_ebml_master(pb, MATROSKA_ID_CUETRACKPOSITION, MAX_CUETRACKPOS_SIZE);
put_ebml_uint(pb, MATROSKA_ID_CUETRACK , entry[j].tracknum );
put_ebml_uint(pb, MATROSKA_ID_CUECLUSTERPOSITION, entry[j].cluster_pos);