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avformat/mov.c: require tfhd to begin parsing trun

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Detecting missing tfhd avoids re-using tfhd track info from the previous
moof. For files with multiple tracks, this may make a mess of the
avindex and fragindex, which can later trigger av_assert0 in
mov_read_trun().

Reviewed-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
chcunningham 2019-02-06 16:12:51 -08:00 • committed by Michael Niedermayer
parent 7cab5471b2
commit 3ea87e5d9e
2 changed files with 11 additions and 0 deletions
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1
libavformat/isom.h
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@ -87,6 +87,7 @@ typedef struct MOVAtom {
struct MOVParseTableEntry;
typedef struct MOVFragment {
int found_tfhd;
unsigned track_id;
uint64_t base_data_offset;
uint64_t moof_offset;

10
libavformat/mov.c
View file

@ -1366,6 +1366,9 @@ static void fix_frag_index_entries(MOVFragmentIndex *frag_index, int index,
static int mov_read_moof(MOVContext *c, AVIOContext *pb, MOVAtom atom)
{
// Set by mov_read_tfhd(). mov_read_trun() will reject files missing tfhd.
c->fragment.found_tfhd = 0;
if (!c->has_looked_for_mfra && c->use_mfra_for > 0) {
c->has_looked_for_mfra = 1;
if (pb->seekable & AVIO_SEEKABLE_NORMAL) {
@ -4544,6 +4547,8 @@ static int mov_read_tfhd(MOVContext *c, AVIOContext *pb, MOVAtom atom)
MOVTrackExt *trex = NULL;
int flags, track_id, i;
c->fragment.found_tfhd = 1;
avio_r8(pb); /* version */
flags = avio_rb24(pb);
@ -4679,6 +4684,11 @@ static int mov_read_trun(MOVContext *c, AVIOContext *pb, MOVAtom atom)
AVIndexEntry *new_entries;
MOVFragmentStreamInfo * frag_stream_info;
if (!frag->found_tfhd) {
av_log(c->fc, AV_LOG_ERROR, "trun track id unknown, no tfhd was found\n");
return AVERROR_INVALIDDATA;
}
for (i = 0; i < c->fc->nb_streams; i++) {
if (c->fc->streams[i]->id == frag->track_id) {
st = c->fc->streams[i];