Extract basic tags, as a fallback

scanner/metadata/metadata.go

@@ -115,15 +115,17 @@ func (m *baseMetadata) parseFloat(tagName string) float32 {
 
 var dateRegex = regexp.MustCompile(`([12]\d\d\d)`)
 
-func (m *baseMetadata) parseYear(tagName string) int {
-	if v, ok := m.tags[tagName]; ok {
-		match := dateRegex.FindStringSubmatch(v)
-		if len(match) == 0 {
-			log.Warn("Error parsing year from ffmpeg date field", "file", m.filePath, "date", v)
-			return 0
+func (m *baseMetadata) parseYear(tags ...string) int {
+	for _, t := range tags {
+		if v, ok := m.tags[t]; ok {
+			match := dateRegex.FindStringSubmatch(v)
+			if len(match) == 0 {
+				log.Warn("Error parsing year from ffmpeg date field", "file", m.filePath, "date", v)
+				return 0
+			}
+			year, _ := strconv.Atoi(match[1])
+			return year
 		}
-		year, _ := strconv.Atoi(match[1])
-		return year
 	}
 	return 0
 }

scanner/metadata/taglib.go

@@ -14,6 +14,14 @@ type taglibMetadata struct {
 	hasPicture bool
 }
 
+func (m *taglibMetadata) Title() string  { return m.getTag("title", "titlesort", "_track") }
+func (m *taglibMetadata) Album() string  { return m.getTag("album", "albumsort", "_album") }
+func (m *taglibMetadata) Artist() string { return m.getTag("artist", "artistsort", "_artist") }
+func (m *taglibMetadata) Genre() string  { return m.getTag("genre", "_genre") }
+func (m *taglibMetadata) Year() int      { return m.parseYear("date", "_year") }
+func (m *taglibMetadata) TrackNumber() (int, int) {
+	return m.parseTuple("track", "tracknumber", "_track")
+}
 func (m *taglibMetadata) Duration() float32 { return m.parseFloat("length") }
 func (m *taglibMetadata) BitRate() int      { return m.parseInt("bitrate") }
 func (m *taglibMetadata) HasPicture() bool  { return m.hasPicture }

scanner/metadata/taglib/taglib_parser.cpp

@@ -21,12 +21,37 @@ int taglib_read(const char *filename, unsigned long id) {
     return TAGLIB_ERR_AUDIO_PROPS;
   }
 
+  // Add audio properties to the tags
   const TagLib::AudioProperties *props(f.audioProperties());
   go_map_put_int(id, (char *)"length", props->length());
   go_map_put_int(id, (char *)"bitrate", props->bitrate());
 
   TagLib::PropertyMap tags = f.file()->properties();
 
+  // Make sure at least the basic properties are extracted
+  TagLib::Tag *basic = f.file()->tag();
+  if (!basic->isEmpty()) {
+    if (!basic->title().isEmpty()) {
+      tags.insert("_title", basic->title());
+    }
+    if (!basic->artist().isEmpty()) {
+      tags.insert("_artist", basic->artist());
+    }
+    if (!basic->album().isEmpty()) {
+      tags.insert("_album", basic->album());
+    }
+    if (!basic->genre().isEmpty()) {
+      tags.insert("_genre", basic->genre());
+    }
+    if (basic->year() > 0) {
+      tags.insert("_year", TagLib::String::number(basic->year()));
+    }
+    if (basic->track() > 0) {
+      tags.insert("_track", TagLib::String::number(basic->track()));
+    }
+  }
+
+  // Get some extended/non-standard ID3-only tags (ex: iTunes extended frames)
   TagLib::MPEG::File *mp3File(dynamic_cast<TagLib::MPEG::File *>(f.file()));
   if (mp3File != NULL) {
     if (mp3File->ID3v2Tag()) {
@@ -39,6 +64,7 @@ int taglib_read(const char *filename, unsigned long id) {
     }
   }
 
+  // Get only the first occurrence of each tag (for now)
   for (TagLib::PropertyMap::ConstIterator i = tags.begin(); i != tags.end();
        ++i) {
     for (TagLib::StringList::ConstIterator j = i->second.begin();

scanner/metadata/taglib/taglib_parser.go

@@ -38,7 +38,7 @@ func Read(filename string) (map[string]string, error) {
 	if res != 0 {
 		return nil, fmt.Errorf("cannot process %s", filename)
 	}
-	log.Trace("TagLib: read tags", "tags", m, "filename", "filename")
+	log.Debug("TagLib: read tags", "tags", m, "filename", filename)
 	return m, nil
 }