libcgss is a helper library for THE iDOLM@STER Cinderella Girls Starlight Stage (CGSS/DereSute/デレステ). It currently supports HCA audio decoding and ACB exploring. It also applies to other games like THE iDOLM@STER Million Live! Theater Days (MLTD/MiriShita/ミリシタ).
key should be 0 (ciph 0x00) output is garbled, but not entirely
密钥应为0（ciph值为0x00） 输出未正常解码，但并不是完全噪音
Source: Rizline - https://apps.apple.com/hk/app/id1632188345 / https://play.google.com/store/apps/details?id=com.leiting.RizlineHk.android
rizline_MainMenu_BGM_Loop_1.acb.gz