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CedarX is a proprietary multimedia framework distributed by Allwinner and not supported by the linux-sunxi community.

It's the name of the proprietary software libraries responsible for hardware accelerated video and audio de-/encoding (CedarV + CedarA) in conjunction with with a hardware block. As for audio, the hardware ACE (Audio Codec Engine) appears to only exist in A10 and older SoCs. Allwinner refactored their proprietary userspace libraries and published them partly under GPLv2 naming them "media-codec" while some codecs are still only available as proprietary binary blobs linked in like plugins.