[FFmpeg-cvslog] avformat/id3v2: Add Grouping frame to id3v2.4 metadata table

[Wolfgang Müller]

ffmpeg | branch: master | Wolfgang Müller <wolf at oriole.systems> | Sun Feb 13 14:46:33 2022 +0100| [a67734596dca097584965916e0ba90e81af3163c] | committer: Anton Khirnov

avformat/id3v2: Add Grouping frame to id3v2.4 metadata table

The ID3v2.4.0 standard defines TIT1 as the "Content group description"
tag [1]. This frame is usually referred to as the "Grouping" tag and in
de-facto use under that name by Vorbis and APEv2 [2].

This commit introduces a mapping from "TIT1" to "grouping" in the
id3v2.4 metadata conversion table. This will enable software to access
it using that name. In particular, MPD will now read this tag correctly
when using the ffmpeg decoder plugin.

[1] https://id3.org/id3v2.4.0-frames (4.2.1)
[2] https://picard-docs.musicbrainz.org/en/appendices/tag_mapping.html#grouping-3

Signed-off-by: Wolfgang Müller <wolf at oriole.systems>
Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a67734596dca097584965916e0ba90e81af3163c
---

 libavformat/id3v2.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavformat/id3v2.c b/libavformat/id3v2.c
index ff27c062e5..0f9bedea02 100644
--- a/libavformat/id3v2.c
+++ b/libavformat/id3v2.c
@@ -69,6 +69,7 @@ const AVMetadataConv ff_id3v2_4_metadata_conv[] = {
     { "TSOA", "album-sort"    },
     { "TSOP", "artist-sort"   },
     { "TSOT", "title-sort"    },
+    { "TIT1", "grouping"      },
     { 0 }
 };