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XMP is a media-metadata standard based on XML which may be used across a variety of media formats. Some video-processing software writes XMP data without updating the native metadata fields. Therefore, we should aim at reading XMP metadata and give priority of XMP data over native fields. Pros: - Support for *all* common media formats. Cons: - XML (complex, verbose, chaotic). - Does not even come close to fulfilling its promise of being well defined (see below). Implement a simple XMP-parser using libxml2. Connect the XMP-parser to the existing Quicktime/MP4 parser. First problem encountered: According to the spec, XMP data supposed to be put in the 'XMP_' atom. But for example exiftools instead writes an 'uuid' atom with a special 16-byte uid. Implement both, more options will probably follow. Second problem: two versions of recording the creation date were found 1) The content of a <exif:DateTimeOriginal> tag. 2) The xmp::CreateDate attribute of a <rdf:Description> tag. Here too, more versions are expected to surface and will have to be supported in due course (with an obvious priority problem). Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
11 lines
254 B
C
11 lines
254 B
C
// Parse XMP blocks using libxml2
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#ifndef XMP_PARSER_H
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#define XMP_PARSER_H
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#include "units.h" // for timestamp_t
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#include <stddef.h> // for size_t
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timestamp_t parse_xmp(const char *data, size_t size); // On failure returns 0.
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#endif // XMP_PARSER_H
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