MasterClockChangeNotifier typedef

MasterClockChangeNotifier = void Function(int positionSec, int totalDurationSec, bool isPlaying, double playbackRate, int positionMs)

主时钟变更回调：positionSec(秒)、totalDurationSec(秒)、isPlaying、playbackRate、positionMs(毫秒，供信令 offset 对齐)

Implementation

typedef MasterClockChangeNotifier =
    void Function(
      int positionSec,
      int totalDurationSec,
      bool isPlaying,
      double playbackRate,
      int positionMs,
    );