getid3_mp3::MPEGaudioHeaderValid( array $rawarray, bool $echoerrors = false, bool $allowBitrate15 = false ): bool

1846	public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) {1847		if (!isset($rawarray['synch']) || ($rawarray['synch'] & 0x0FFE) != 0x0FFE) {1848			return false;1849		}1850 1851		static $MPEGaudioVersionLookup;1852		static $MPEGaudioLayerLookup;1853		static $MPEGaudioBitrateLookup;1854		static $MPEGaudioFrequencyLookup;1855		static $MPEGaudioChannelModeLookup;1856		static $MPEGaudioModeExtensionLookup;1857		static $MPEGaudioEmphasisLookup;1858		if (empty($MPEGaudioVersionLookup)) {1859			$MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();1860			$MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();1861			$MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();1862			$MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();1863			$MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();1864			$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();1865			$MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();1866		}1867 1868		if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {1869			$decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];1870		} else {1871			echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');1872			return false;1873		}1874		if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {1875			$decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];1876		} else {1877			echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');1878			return false;1879		}1880		if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {1881			echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');1882			if ($rawarray['bitrate'] == 15) {1883				// known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 01884				// let it go through here otherwise file will not be identified1885				if (!$allowBitrate15) {1886					return false;1887				}1888			} else {1889				return false;1890			}1891		}1892		if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {1893			echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');1894			return false;1895		}1896		if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {1897			echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');1898			return false;1899		}1900		if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {1901			echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');1902			return false;1903		}1904		if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {1905			echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');1906			return false;1907		}1908		// These are just either set or not set, you can't mess that up :)1909		// $rawarray['protection'];1910		// $rawarray['padding'];1911		// $rawarray['private'];1912		// $rawarray['copyright'];1913		// $rawarray['original'];1914 1915		return true;1916	}