Persist timecode when seeking a SoundCloudM3uAudioTrack (#173)

* feat(sc-mp3): propagate timecode to seek to for persisting the position

* fix(sc-mp3): record seek after parsing headers (need downstream)

Author: rxsto

main/src/main/java/com/sedmelluq/discord/lavaplayer/container/mp3/Mp3TrackProvider.java

@@ -156,6 +156,16 @@ public void seekToTimecode(long timecode) {
         }
     }
 
+    /**
+     * Records a seek to the specified timecode without actually seeking.
+     *
+     * @param timecode The requested timecode in milliseconds
+     * @param actualTimecode The actual timecode in milliseconds
+     */
+    public void recordSeek(long timecode, long actualTimecode) {
+        downstream.seekPerformed(timecode, actualTimecode);
+    }
+
     /**
      * @return True if the track is seekable (false for streams for example).
      */

main/src/main/java/com/sedmelluq/discord/lavaplayer/source/soundcloud/SoundCloudMp3SegmentDecoder.java

@@ -35,6 +35,10 @@ public void playStream(
 
             try {
                 trackProvider.parseHeaders();
+
+                // Persist the position to seek to
+                trackProvider.recordSeek(desiredPosition, startPosition);
+
                 trackProvider.provideFrames();
             } finally {
                 trackProvider.close();