MarsSeed [1] filed a deletion request for ros-melodic-audio-common [2]: Dead, unbuildable package from 2021. A required transitive dependency no longer exists (ros-melodic- message-runtime).
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ros-melodic-audio-common/
