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You can install your own EXIF

You can install your own EXIF-callback and get all EXIF/TIFF tags into your app.
This callback is called:
- EXIF: tag parameter is EXIF tag ID
- Kodak Metadata: tag | 0x20000
- Panasonic metadata: tag | 0x30000
- Tiff/DNG IFDs: tag | ((ifd + 1) << 20)

(tag upper bits are for LibRaw 0.19, in 0.18 ifd# was not passed)

This callback is not called on makernotes value parsing, but will receive complete makernotes record as tag# 0x927c

-- Alex Tutubalin