Add support for AVIF still and animated

internal/magic/ftyp.go

@@ -1,6 +1,10 @@
 package magic
 
 var (
+	// AVIF matches an AV1 Image File Format still or animated.
+	// Wikipedia page seems outdated listing image/avif-sequence for animations.
+	// https://github.com/AOMediaCodec/av1-avif/issues/59
+	AVIF = ftyp([]byte("avif"), []byte("avis"))
 	// Mp4 matches an MP4 file.
 	Mp4 = ftyp(
 		[]byte("avc1"), []byte("dash"), []byte("iso2"), []byte("iso3"),

mimetype_test.go

@@ -34,6 +34,8 @@ var files = map[string]string{
 	"atom.atom":          "application/atom+xml",
 	"au.au":              "audio/basic",
 	"avi.avi":            "video/x-msvideo",
+	"avif.avif":          "image/avif",
+	"avifsequence.avif":  "image/avif",
 	"bmp.bmp":            "image/bmp",
 	"bpg.bpg":            "image/bpg",
 	"bz2.bz2":            "application/x-bzip2",

supported_mimes.md

@@ -1,4 +1,4 @@
-## 165 Supported MIME types
+## 166 Supported MIME types
 This file is automatically generated when running tests. Do not edit manually.
 
 Extension | MIME type | Aliases
@@ -135,6 +135,7 @@ Extension | MIME type | Aliases
 **.pat** | image/x-gimp-pat | -
 **.gbr** | image/x-gimp-gbr | -
 **.glb** | model/gltf-binary | -
+**.avif** | image/avif | -
 **.txt** | text/plain | -
 **.html** | text/html | -
 **.svg** | image/svg+xml | -

tree.go

@@ -24,7 +24,7 @@ var root = newMIME("application/octet-stream", "",
 	gzip, class, swf, crx, ttf, woff, woff2, otf, eot, wasm, shx, dbf, dcm, rar,
 	djvu, mobi, lit, bpg, sqlite3, dwg, nes, lnk, macho, qcp, icns, heic,
 	heicSeq, heif, heifSeq, hdr, mrc, mdb, accdb, zstd, cab, rpm, xz, lzip,
-	torrent, cpio, tzif, xcf, pat, gbr, glb,
+	torrent, cpio, tzif, xcf, pat, gbr, glb, avif,
 	// Keep text last because it is the slowest check
 	text,
 )
@@ -133,6 +133,7 @@ var (
 	heif    = newMIME("image/heif", ".heif", magic.Heif)
 	heifSeq = newMIME("image/heif-sequence", ".heif", magic.HeifSequence)
 	hdr     = newMIME("image/vnd.radiance", ".hdr", magic.Hdr)
+	avif    = newMIME("image/avif", ".avif", magic.AVIF)
 	mp3     = newMIME("audio/mpeg", ".mp3", magic.Mp3).
 		alias("audio/x-mpeg", "audio/mp3")
 	flac = newMIME("audio/flac", ".flac", magic.Flac)