@class NSDictionary, NSIndexSet; @interface TSCHDownsampleData : NSObject @property (readonly, copy, nonatomic) NSDictionary *indexToPositionMap; @property (readonly, copy, nonatomic) NSDictionary *positionToIndexMap; @property (readonly, copy, nonatomic) NSIndexSet *indexSet; + (id)emptyData; + (id)dataWithIndexSet:(id)a0; + (id)dataWithIndexSet:(id)a0 indexToPositionMap:(id)a1 positionToIndexMap:(id)a2; - (id)initWithIndexSet:(id)a0; - (void).cxx_destruct; - (unsigned long long)indexAtPosition:(unsigned long long)a0; - (id)initWithIndexSet:(id)a0 indexToPositionMap:(id)a1 positionToIndexMap:(id)a2; - (unsigned long long)positionOfIndex:(unsigned long long)a0; @end