Add AVIF image filetype

[koodimetsa]

AVIF support is getting traction in browsers and it would be great to detect AVIF-files as images 👍🏼

[Mr Tom]

Could you provide a small test file?

Header bytes seem to be:

00 00 00 18 66 74 79 70 61 76 69 66 00 00 00 00
....ftypavif....

The avif part can be avif, avis or avio according to https://aomediacodec.github.io/av1-avif/#biblio-isobmff

[koodimetsa]

Hi,

Here is one:
https://raw.githubusercontent.com/AOMediaCodec/av1-avif/master/testFiles/Microsoft/Mexico.avif

Would put it here, but Github doesn't support AVIF yet 😅