group-desktop: Add Grouping tag patch for media-video/ffmpeg

Whilst this patch has been accepted upstream through [1]/[2], we still
need to apply it locally until a stable version with it is released.

[1] https://ffmpeg.org/pipermail/ffmpeg-devel/2022-February/293001.html
[2] https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/a67734596dca097584965916e0ba90e81af3163c

1 files changed, 35 insertions, 0 deletions

diff --git a/group-desktop/patches/media-video/ffmpeg/0001-avformat-id3v2-Add-Grouping-frame-to-id3v2.4-metadat.patch b/group-desktop/patches/media-video/ffmpeg/0001-avformat-id3v2-Add-Grouping-frame-to-id3v2.4-metadat.patch
new file mode 100644
index 0000000..f51dcae
--- /dev/null
+++ b/group-desktop/patches/media-video/ffmpeg/0001-avformat-id3v2-Add-Grouping-frame-to-id3v2.4-metadat.patch
@@ -0,0 +1,35 @@
+From 323acd73685903e8b1c8b99bfe89fb06b9b6ed63 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Wolfgang=20M=C3=BCller?= <wolf@oriole.systems>
+Date: Sun, 13 Feb 2022 12:45:40 +0100
+Subject: [PATCH] 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
+---
+ 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 }
+ };
+ 
+-- 
+2.35.1
+