From 4afd5d355396d176adfc81c0379bcca604d12ab3 Mon Sep 17 00:00:00 2001
From: Zoe Roux <zoe.roux@zoriya.dev>
Date: Sun, 20 Jul 2025 14:49:43 +0200
Subject: [PATCH] Add `mime_codec` to subtitles in the transcoder

---
 transcoder/src/info.go      | 13 +++++++++++--
 transcoder/src/metadata.go  | 11 ++++++-----
 transcoder/src/subtitles.go |  1 +
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/transcoder/src/info.go b/transcoder/src/info.go
index c6acf295..1d0a882d 100644
--- a/transcoder/src/info.go
+++ b/transcoder/src/info.go
@@ -17,7 +17,7 @@ import (
 	"gopkg.in/vansante/go-ffprobe.v2"
 )
 
-const InfoVersion = 2
+const InfoVersion = 3
 
 type Versions struct {
 	Info      int32 `json:"info"`
@@ -112,6 +112,8 @@ type Subtitle struct {
 	Language *string `json:"language"`
 	/// The codec of this stream.
 	Codec string `json:"codec"`
+	/// The codec of this stream (defined as the RFC 6381).
+	MimeCodec *string `json:"mimeCodec"`
 	/// The extension for the codec.
 	Extension *string `json:"extension"`
 	/// Is this stream the default one of it's type?
@@ -136,7 +138,7 @@ type Chapter struct {
 	/// The name of this chapter. This should be a human-readable name that could be presented to the user.
 	Name string `json:"name"`
 	/// The type value is used to mark special chapters (openning/credits...)
-	Type ChapterType `json:"type"`  
+	Type ChapterType `json:"type"`
 }
 
 type ChapterType string
@@ -222,6 +224,12 @@ var SubtitleExtensions = map[string]string{
 	"vtt":    "vtt",
 }
 
+var SubtitleMimes = map[string]string{
+	"subrip": "application/x-subrip",
+	"ass":    "text/x-ssa",
+	"vtt":    "text/vtt",
+}
+
 func RetriveMediaInfo(path string, sha string) (*MediaInfo, error) {
 	defer utils.PrintExecTime("mediainfo for %s", path)()
 
@@ -288,6 +296,7 @@ func RetriveMediaInfo(path string, sha string) (*MediaInfo, error) {
 				Title:             OrNull(stream.Tags.Title),
 				Language:          NullIfUnd(lang.String()),
 				Codec:             stream.CodecName,
+				MimeCodec:         OrNull(SubtitleMimes[stream.CodecName]),
 				Extension:         extension,
 				IsDefault:         stream.Disposition.Default != 0,
 				IsForced:          stream.Disposition.Forced != 0,
diff --git a/transcoder/src/metadata.go b/transcoder/src/metadata.go
index 254fdc14..ca20bdad 100644
--- a/transcoder/src/metadata.go
+++ b/transcoder/src/metadata.go
@@ -241,7 +241,7 @@ func (s *MetadataService) getMetadata(path string, sha string) (*MediaInfo, erro
 	}
 
 	rows, err = s.database.Query(
-		`select s.idx, s.title, s.language, s.codec, s.extension, s.is_default, s.is_forced, s.is_hearing_impaired
+		`select s.idx, s.title, s.language, s.codec, s.mime_codec s.extension, s.is_default, s.is_forced, s.is_hearing_impaired
 		from subtitles as s where s.sha=$1`,
 		sha,
 	)
@@ -250,7 +250,7 @@ func (s *MetadataService) getMetadata(path string, sha string) (*MediaInfo, erro
 	}
 	for rows.Next() {
 		var s Subtitle
-		err := rows.Scan(&s.Index, &s.Title, &s.Language, &s.Codec, &s.Extension, &s.IsDefault, &s.IsForced, &s.IsHearingImpaired)
+		err := rows.Scan(&s.Index, &s.Title, &s.Language, &s.Codec, &s.MimeCodec, &s.Extension, &s.IsDefault, &s.IsForced, &s.IsHearingImpaired)
 		if err != nil {
 			return nil, err
 		}
@@ -351,20 +351,21 @@ func (s *MetadataService) storeFreshMetadata(path string, sha string) (*MediaInf
 	}
 	for _, s := range ret.Subtitles {
 		tx.Exec(`
-			insert into subtitles(sha, idx, title, language, codec, extension, is_default, is_forced, is_hearing_impaired)
-			values ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+			insert into subtitles(sha, idx, title, language, codec, mime_codec, extension, is_default, is_forced, is_hearing_impaired)
+			values ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)
 			on conflict (sha, idx) do update set
 				sha = excluded.sha,
 				idx = excluded.idx,
 				title = excluded.title,
 				language = excluded.language,
 				codec = excluded.codec,
+				mime_codec = excluded.mime_codec,
 				extension = excluded.extension,
 				is_default = excluded.is_default,
 				is_forced = excluded.is_forced,
 				is_hearing_impaired = excluded.is_hearing_impaired
 			`,
-			ret.Sha, s.Index, s.Title, s.Language, s.Codec, s.Extension, s.IsDefault, s.IsForced, s.IsHearingImpaired,
+			ret.Sha, s.Index, s.Title, s.Language, s.Codec, s.MimeCodec, s.Extension, s.IsDefault, s.IsForced, s.IsHearingImpaired,
 		)
 	}
 	for _, c := range ret.Chapters {
diff --git a/transcoder/src/subtitles.go b/transcoder/src/subtitles.go
index ad6bccc0..3a52d58a 100644
--- a/transcoder/src/subtitles.go
+++ b/transcoder/src/subtitles.go
@@ -38,6 +38,7 @@ outer:
 				sub := Subtitle{
 					Index:      nil,
 					Codec:      codec,
+					MimeCodec:  OrNull(SubtitleMimes[codec]),
 					Extension:  &ext,
 					IsExternal: true,
 					Path:       &match,