Optimizing the Aural Experience on Android Devices with xHE-AAC

This post introduces the implementation of xHE-AAC on Android devices. It details the technical aspects of MPEG-D DRC, including its use for loudness management by normalizing dialogue levels using anchorLoudness metadata and decoder-side gain. It also explains dynamic range control (DRC) using the uniDRC payload to adapt audio to different playback environments and devices, reducing dynamic range where necessary without affecting dialogue. The post highlights the use of Android's MediaFormat APIs and specific keys like KEY_AAC_DRC_TARGET_REFERENCE_LEVEL.