wp-includes/ID3/module.audio.ac3.php:505$fscodintint|string|false public static function sampleRateCodeLookup($fscod) { static $sampleRateCodeLookup = array( 0 => 48000, 1 => 44100, 2 => 32000, 3 => 'reserved' // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute. ); return (isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false); }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/ID3/module.audio.ac3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.