Re: Question about Test Suite

Hey,

> How does mkvinfo get to 451452 to begin reading the next element
> instead?

mkvinfo uses libebml's EbmlMaster::Read() function for reading a cluster
en bloc and then outputs which elements libebml has found.

EbmlMaster::Read() uses EbmlEmenet::FindNextElement() under the hood
for finding the next ID. And that function reads as many bytes as
needed for forming a valid ID.

So if the byte at position 451451 happens to be 0 (which I haven't
verified, mind you) then it will probably be skipped as an EBML ID's
first byte is never 0. Similar reasoning for other values for the
first byte, e.g. anything smaller than 0x10 would be invalid as EBML
IDs can only be four bytes long, and the position of first bit set to
1 determines the size of the EBML ID.

Kind regards,
mosu

_______________________________________________
Matroska-devel mailing list
[email protected]
http://lists.matroska.org/cgi-bin/mailman/listinfo/matroska-devel
Read Matroska-Devel on GMane: http://dir.gmane.org/gmane.comp.multimedia.matroska.devel

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=l76U
-----END PGP SIGNATURE-----