buffered method
Return buffered duration in milliseconds. https://github.com/wang-bin/mdk-sdk/wiki/Player-APIs#int64_t-bufferedint64_t-bytes--nullptr-const
Implementation
int buffered() {
//var cbytes = calloc<Int64>();
final ret = _player.ref.buffered
.asFunction<int Function(Pointer<mdkPlayer>, Pointer<Int64>)>()(
_player.ref.object, nullptr);
//cbytes.value
//calloc.free(cbytes);
return ret;
}