getid3_mp3::MPEGaudioHeaderDecode() public WP 1.0

{} Это метод класса: getid3_mp3{}

Хуков нет.

Возвращает

Массив|false.

Использование

$result = getid3_mp3::MPEGaudioHeaderDecode( $Header4Bytes );

$Header4Bytes(строка) (обязательный)

-

Код getid3_mp3::MPEGaudioHeaderDecode() getid3 mp3::MPEGaudioHeaderDecode ^{WP 5.8.1}

public static function MPEGaudioHeaderDecode($Header4Bytes) {
	// AAAA AAAA  AAAB BCCD  EEEE FFGH  IIJJ KLMM
	// A - Frame sync (all bits set)
	// B - MPEG Audio version ID
	// C - Layer description
	// D - Protection bit
	// E - Bitrate index
	// F - Sampling rate frequency index
	// G - Padding bit
	// H - Private bit
	// I - Channel Mode
	// J - Mode extension (Only if Joint stereo)
	// K - Copyright
	// L - Original
	// M - Emphasis

	if (strlen($Header4Bytes) != 4) {
		return false;
	}

	$MPEGrawHeader['synch']         = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
	$MPEGrawHeader['version']       = (ord($Header4Bytes[1]) & 0x18) >> 3; //    BB
	$MPEGrawHeader['layer']         = (ord($Header4Bytes[1]) & 0x06) >> 1; //      CC
	$MPEGrawHeader['protection']    = (ord($Header4Bytes[1]) & 0x01);      //        D
	$MPEGrawHeader['bitrate']       = (ord($Header4Bytes[2]) & 0xF0) >> 4; // EEEE
	$MPEGrawHeader['sample_rate']   = (ord($Header4Bytes[2]) & 0x0C) >> 2; //     FF
	$MPEGrawHeader['padding']       = (ord($Header4Bytes[2]) & 0x02) >> 1; //       G
	$MPEGrawHeader['private']       = (ord($Header4Bytes[2]) & 0x01);      //        H
	$MPEGrawHeader['channelmode']   = (ord($Header4Bytes[3]) & 0xC0) >> 6; // II
	$MPEGrawHeader['modeextension'] = (ord($Header4Bytes[3]) & 0x30) >> 4; //   JJ
	$MPEGrawHeader['copyright']     = (ord($Header4Bytes[3]) & 0x08) >> 3; //     K
	$MPEGrawHeader['original']      = (ord($Header4Bytes[3]) & 0x04) >> 2; //      L
	$MPEGrawHeader['emphasis']      = (ord($Header4Bytes[3]) & 0x03);      //       MM

	return $MPEGrawHeader;
}