Show taglib and ffmpeg versions in the log

core/ffmpeg/ffmpeg.go

@@ -23,6 +23,7 @@ type FFmpeg interface {
 	Probe(ctx context.Context, files []string) (string, error)
 	CmdPath() (string, error)
 	IsAvailable() bool
+	Version() string
 }
 
 func New() FFmpeg {
@@ -84,6 +85,24 @@ func (e *ffmpeg) IsAvailable() bool {
 	return err == nil
 }
 
+// Version executes ffmpeg -version and extracts the version from the output.
+// Sample output: ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
+func (e *ffmpeg) Version() string {
+	cmd, err := ffmpegCmd()
+	if err != nil {
+		return "N/A"
+	}
+	out, err := exec.Command(cmd, "-version").CombinedOutput() // #nosec
+	if err != nil {
+		return "N/A"
+	}
+	parts := strings.Split(string(out), " ")
+	if len(parts) < 3 {
+		return "N/A"
+	}
+	return parts[2]
+}
+
 func (e *ffmpeg) start(ctx context.Context, args []string) (io.ReadCloser, error) {
 	log.Trace(ctx, "Executing ffmpeg command", "cmd", args)
 	j := &ffCmd{args: args}

scanner/metadata/ffmpeg/ffmpeg.go

@@ -49,6 +49,10 @@ func (e *Extractor) CustomMappings() metadata.ParsedTags {
 	}
 }
 
+func (e *Extractor) Version() string {
+	return e.ffmpeg.Version()
+}
+
 func (e *Extractor) extractMetadata(filePath, info string) (metadata.ParsedTags, error) {
 	tags := e.parseInfo(info)
 	if len(tags) == 0 {

scanner/metadata/metadata.go

@@ -22,6 +22,7 @@ import (
 type Extractor interface {
 	Parse(files ...string) (map[string]ParsedTags, error)
 	CustomMappings() ParsedTags
+	Version() string
 }
 
 var extractors = map[string]Extractor{}
@@ -30,6 +31,12 @@ func RegisterExtractor(id string, parser Extractor) {
 	extractors[id] = parser
 }
 
+func LogExtractors() {
+	for id, p := range extractors {
+		log.Debug("Registered metadata extractor", "id", id, "version", p.Version())
+	}
+}
+
 func Extract(files ...string) (map[string]Tags, error) {
 	p, ok := extractors[conf.Server.Scanner.Extractor]
 	if !ok {

scanner/metadata/taglib/taglib.go

@@ -34,6 +34,10 @@ func (e *Extractor) CustomMappings() metadata.ParsedTags {
 	}
 }
 
+func (e *Extractor) Version() string {
+	return Version()
+}
+
 func (e *Extractor) extractMetadata(filePath string) (metadata.ParsedTags, error) {
 	tags, err := Read(filePath)
 	if err != nil {

scanner/metadata/taglib/taglib_wrapper.cpp

@@ -21,6 +21,13 @@
 
 char has_cover(const TagLib::FileRef f);
 
+static char TAGLIB_VERSION[16];
+
+char* taglib_version() {
+    snprintf((char *)TAGLIB_VERSION, 16, "%d.%d.%d", TAGLIB_MAJOR_VERSION, TAGLIB_MINOR_VERSION, TAGLIB_PATCH_VERSION);
+    return (char *)TAGLIB_VERSION;
+}
+
 int taglib_read(const FILENAME_CHAR_T *filename, unsigned long id) {
   TagLib::FileRef f(filename, true, TagLib::AudioProperties::Fast);
 

scanner/metadata/taglib/taglib_wrapper.go

@@ -25,6 +25,10 @@ import (
 
 const iTunesKeyPrefix = "----:com.apple.itunes:"
 
+func Version() string {
+	return C.GoString(C.taglib_version())
+}
+
 func Read(filename string) (tags map[string][]string, err error) {
 	// Do not crash on failures in the C code/library
 	debug.SetPanicOnFault(true)

scanner/metadata/taglib/taglib_wrapper.h

@@ -17,6 +17,7 @@ extern void go_map_put_int(unsigned long id, char *key, int val);
 extern void go_map_put_lyrics(unsigned long id, char *lang, char *val);
 extern void go_map_put_lyric_line(unsigned long id, char *lang, char *text, int time);
 int taglib_read(const FILENAME_CHAR_T *filename, unsigned long id);
+char* taglib_version();
 
 #ifdef __cplusplus
 }

scanner/tag_scanner.go

@@ -38,6 +38,7 @@ func NewTagScanner(rootFolder string, ds model.DataStore, playlists core.Playlis
 		ds:          ds,
 		cacheWarmer: cacheWarmer,
 	}
+	metadata.LogExtractors()
 
 	return s
 }

tests/mock_ffmpeg.go

@@ -64,6 +64,10 @@ func (ff *MockFFmpeg) CmdPath() (string, error) {
 	return "ffmpeg", nil
 }
 
+func (ff *MockFFmpeg) Version() string {
+	return "1.0"
+}
+
 func (ff *MockFFmpeg) Read(p []byte) (n int, err error) {
 	ff.lock.Lock()
 	defer ff.lock.Unlock()