getid3_mp3::MPEGaudioHeaderDecode() public WP 1.0
{} Это метод класса: getid3_mp3{}
Хуков нет.
Возвращает
Массив/false.
Использование
$result = getid3_mp3::MPEGaudioHeaderDecode( $Header4Bytes );
- $Header4Bytes(строка) (обязательный)
Код getid3_mp3::MPEGaudioHeaderDecode() getid3 mp3::MPEGaudioHeaderDecode WP 5.6
public static function MPEGaudioHeaderDecode($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;
}