In handlers made use of oggtag.ReadFile() func. Also updated func names.

internal/http/dj_handlers.go

@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"log"
 	"net/http"
-	"os"
 	"time"
 )
 
@@ -58,17 +57,15 @@ func (dj *DJHandlers) PlaylistNext(w http.ResponseWriter, _ *http.Request) {
 		log.Println("the end of a playlist has been reached")
 	} else {
 		go func() {
-			f, err := os.Open(nxt)
+			bs, be, err := oggtag.ReadFile(nxt)
 			if err != nil {
-				log.Println("cannot open file \"", nxt, "\" to read tags")
+				log.Println("cannot read an OGG file", nxt, ":", err)
 			}
 
-			buf := make([]byte, 4096)
-			f.Read(buf)
-
 			song := radio.Song_{
-				Artist:       oggtag.OggGetTag(buf, "artist"),
-				Title:        oggtag.OggGetTag(buf, "title"),
+				Artist:       oggtag.GetTag(bs, "artist"),
+				Title:        oggtag.GetTag(bs, "title"),
+				Duration:     oggtag.GetDuration(bs, be),
 				MaxListeners: dj.listeners.Current(),
 				StartAt:      time.Now()}
 			// radio.CheckAndUpdateMostListenedSong(song, currentSong)