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avformat/mxfdec: fix essence_offset calculation 

The reference point for a KAG is the first byte of the key of a Partition Pack.

Fixes ticket #2817.
Fixes ticket #5317.

Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2018-02-17 11:47:57 +01:00
parent d54a04b69b
commit e9b0e42e77
1 changed files with 2 additions and 2 deletions
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4
libavformat/mxfdec.c
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@ -2875,8 +2875,8 @@ static int mxf_read_header(AVFormatContext *s)
* for OPAtom we still need the actual essence_offset though (the KL's length can vary)
*/
int64_t op1a_essence_offset =
round_to_kag(mxf->current_partition->this_partition +
mxf->current_partition->pack_length, mxf->current_partition->kag_size) +
mxf->current_partition->this_partition +
round_to_kag(mxf->current_partition->pack_length, mxf->current_partition->kag_size) +
round_to_kag(mxf->current_partition->header_byte_count, mxf->current_partition->kag_size) +
round_to_kag(mxf->current_partition->index_byte_count, mxf->current_partition->kag_size);