ItemKey: Add variants for AcoustID

Author: Serial-ATA

CHANGELOG.md

@@ -18,7 +18,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - `ItemKey::ReleaseCountry` ([PR](https://github.com/Serial-ATA/lofty-rs/pull/573))
     - Currently, this maps to the [fields](https://picard-docs.musicbrainz.org/en/appendices/tag_mapping.html#id30) used by MusicBrainz Picard, which expect an
       ISO 3166-1 code.
-- **Serde**: [Serde] support for `*Type` enums (`FileType`, `TagType`, `PictureType`)
+  - `ItemKey::AcoustId` and `ItemKey::AcoustIdFingerprint` ([issue](https://github.com/Serial-ATA/lofty-rs/issues/455)) ([PR](https://github.com/Serial-ATA/lofty-rs/pull/575))
+    - These two fields come from [AcoustID], and can appear multiple times in a single tag.
+- **Serde**: [Serde] support for `*Type` enums (`FileType`, `TagType`, `PictureType`) ([issue](https://github.com/Serial-ATA/lofty-rs/issues/533)) ([PR](https://github.com/Serial-ATA/lofty-rs/pull/534))
   - Support can be enabled with the new `serde` feature (not enabled by default)
 - **Probe**: `Probe::read_bound()` ([PR](https://github.com/Serial-ATA/lofty-rs/pull/557))
   - Same as `Probe::read()`, but returns a [`BoundTaggedFile`](https://docs.rs/lofty/latest/lofty/file/struct.BoundTaggedFile.html)
@@ -1049,4 +1051,5 @@ See [ogg_pager's changelog](ogg_pager/CHANGELOG.md).
 
 [serde]: https://docs.rs/serde
 [TagLib]: https://github.com/taglib/taglib
+[AcoustID]: https://acoustid.org/
 [ogg_pager's changelog]: ogg_pager/CHANGELOG.md

lofty/src/id3/v2/tag.rs

@@ -1416,6 +1416,8 @@ impl MergeTag for SplitTagRemainder {
 		for item_key in [
 			ItemKey::TrackArtists,
 			ItemKey::Director,
+			ItemKey::AcoustId,
+			ItemKey::AcoustIdFingerprint,
 			ItemKey::CatalogNumber,
 			ItemKey::MusicBrainzArtistId,
 			ItemKey::MusicBrainzReleaseArtistId,

lofty/src/tag/item.rs

@@ -131,6 +131,8 @@ gen_map!(
 	"RELEASEDATE"                    => ReleaseDate,
 	"ISRC"                           => Isrc,
 	"Barcode"                        => Barcode,
+	"ACOUSTID_ID"                    => AcoustId,
+	"ACOUSTID_FINGERPRINT"           => AcoustIdFingerprint,
 	"CatalogNumber"                  => CatalogNumber,
 	"Compilation"                    => FlagCompilation,
 	"Media"                          => OriginalMediaType,
@@ -199,6 +201,8 @@ gen_map!(
 	"TDOR"                                  => OriginalReleaseDate,
 	"TSRC"                                  => Isrc,
 	"BARCODE"                               => Barcode,
+	"Acoustid Id"                           => AcoustId,
+	"Acoustid Fingerprint"                  => AcoustIdFingerprint,
 	"CATALOGNUMBER"                         => CatalogNumber,
 	"WORK"                                  => Work, // ID3v2.4: TXXX:WORK (Apple uses TIT1/ContentGroup, see GRP1/AppleId3v2ContentGroup for disambiguation)
 	"MVNM"                                  => Movement,
@@ -300,6 +304,8 @@ gen_map!(
 	"----:com.apple.iTunes:RELEASEDATE"                       => ReleaseDate,
 	"----:com.apple.iTunes:ISRC"                              => Isrc,
 	"----:com.apple.iTunes:BARCODE"                           => Barcode,
+	"----:com.apple.iTunes:Acoustid Id"                       => AcoustId,
+	"----:com.apple.iTunes:Acoustid Fingerprint"              => AcoustIdFingerprint,
 	"----:com.apple.iTunes:CATALOGNUMBER"                     => CatalogNumber,
 	"cpil"                                                    => FlagCompilation,
 	"pcst"                                                    => FlagPodcast,
@@ -411,6 +417,8 @@ gen_map!(
 	"RELEASEDATE"                             => ReleaseDate,
 	"ISRC"                                    => Isrc,
 	"BARCODE"                                 => Barcode,
+	"ACOUSTID_ID"                             => AcoustId,
+	"ACOUSTID_FINGERPRINT"                    => AcoustIdFingerprint,
 	"CATALOGNUMBER"                           => CatalogNumber,
 	"COMPILATION"                             => FlagCompilation,
 	"MEDIA"                                   => OriginalMediaType,
@@ -627,6 +635,18 @@ gen_item_keys!(
 		// Identifiers
 		Isrc,
 		Barcode,
+		/// [AcoustID] audio identifiers
+		///
+		/// Note that this may appear multiple times in a single tag.
+		///
+		/// [AcoustID]: https://acoustid.org/
+		AcoustId,
+		/// [AcoustID] audio fingerprints
+		///
+		/// Note that this may appear multiple times in a single tag.
+		///
+		/// [AcoustID]: https://acoustid.org/
+		AcoustIdFingerprint,
 		CatalogNumber,
 		Work,
 		Movement,