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Ministry of English Composition treatment for the new metadata API

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Originally committed as revision 16427 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson 2009-01-04 20:47:09 +00:00
parent 06a7bd9a2e
commit ea29242cc7
1 changed files with 16 additions and 13 deletions
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29
libavformat/avformat.h
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@ -48,19 +48,22 @@ unsigned avformat_version(void);
/*
* public Metadata API.
* Important concepts, to keep in mind
* 1. keys are unique, there are never 2 tags with equal keys, this is also
* meant semantically that is a demuxer should not knowingly produce
* several keys that are litterally different but semantically identical,
* like key=Author5, key=Author6.
* All authors have to be placed in the same tag for the case of Authors.
* 2. Metadata is flat, there are no subtags, if you for whatever obscene
* reason want to store the email address of the child of producer alice
* and actor bob, that could have key=alice_and_bobs_childs_email_address.
* 3. A tag whichs value is translated has the ISO 639 3-letter language code
* with a '-' between appended. So for example Author-ger=Michael, Author-eng=Mike
* the original/default language is in the unqualified "Author"
* Public Metadata API.
* The metadata API allows libavformat to export metadata tags to a client
* application using a sequence of key/value pairs.
* Important concepts to keep in mind:
* 1. Keys are unique; there can never be 2 tags with the same key. This is
* also meant semantically, i.e., a demuxer should not knowingly produce
* several keys that are literally different but semantically identical.
* E.g., key=Author5, key=Author6. In this example, all authors must be
* placed in the same tag.
* 2. Metadata is flat, not hierarchical; there are no subtags. If you
* want to store, e.g., the email address of the child of producer Alice
* and actor Bob, that could have key=alice_and_bobs_childs_email_address.
* 3. A tag whose value is localized for a particular language is appended
* with a dash character ('-') and the ISO 639 3-letter language code.
* For example: Author-ger=Michael, Author-eng=Mike
* The original/default language is in the unqualified "Author" tag.
* A demuxer should set a default if it sets any translated tag.
*/