Currently playing track often not updated

patrickkfkan · March 14, 2024, 6:40pm

I suspect this to be the same issue raised a while ago regarding the YT Music plugin. I tracked this down to a bug in Volumio’s “statemachine” that affects plugins that prefetch tracks and call setConsumeUpdateService('mpd', true) – which seems to be what Qobuz is doing.

If it’s of any help, here’s the description of the bug and workaround I implemented in the YT Music plugin:

github.com

patrickkfkan/volumio-ytmusic/blob/94bc70a543b845ef40fab7df5ff700c9b482eee7/src/lib/controller/play/PlayController.ts#L494


      
                    }
                  }
                };
                return `ytmusic/${ViewHelper.constructUriSegmentFromView(targetView)}`;
              }
          
              return null;
            }
          }
          
          /**
           * Given state is updated by calling `setConsumeUpdateService('mpd', true)` (`consumeIgnoreMetadata`: true), when moving to
           * prefetched track there's no guarantee the state machine will store the correct consume state obtained from MPD. It depends on
           * whether the state machine increments `currentPosition` before or after MPD calls `pushState()`. The intended
           * order is 'before' - but because the increment is triggered through a timer, it is possible that MPD calls `pushState()` first,
           * thereby causing the state machine to store the wrong state info (title, artist, album...obtained from trackBlock at
           * `currentPosition` which has not yet been incremented).
           *
           * See state machine `syncState()` and  `increasePlaybackTimer()`.
           *
           * `PrefetchPlaybackStateFixer` checks whether the state is consistent when prefetched track is played and `currentPosition` updated