wp-includes/ID3/module.tag.id3v2.php:3279$indexintstring public static function RVA2ChannelTypeLookup($index) { static $RVA2ChannelTypeLookup = array( 0x00 => 'Other', 0x01 => 'Master volume', 0x02 => 'Front right', 0x03 => 'Front left', 0x04 => 'Back right', 0x05 => 'Back left', 0x06 => 'Front centre', 0x07 => 'Back centre', 0x08 => 'Subwoofer' ); return (isset($RVA2ChannelTypeLookup[$index]) ? $RVA2ChannelTypeLookup[$index] : ''); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.tag.id3v2.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.