<?php
+
/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org> //
-// available at http://getid3.sourceforge.net //
-// or http://www.getid3.org //
-// also https://github.com/JamesHeinrich/getID3 //
-/////////////////////////////////////////////////////////////////
-// See readme.txt for more details //
+// available at https://github.com/JamesHeinrich/getID3 //
+// or https://www.getid3.org //
+// or http://getid3.sourceforge.net //
+// see readme.txt for more details //
/////////////////////////////////////////////////////////////////
// //
// module.audio.ac3.php //
class getid3_ac3 extends getid3_handler
{
+ /**
+ * @var array
+ */
private $AC3header = array();
+
+ /**
+ * @var int
+ */
private $BSIoffset = 0;
const syncword = 0x0B77;
+ /**
+ * @return bool
+ */
public function Analyze() {
$info = &$this->getid3->info;
if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x01) {
$thisfile_ac3_raw_bsi['timecod1'] = $this->readHeaderBSI(14); // 5.4.2.27 timecod1: Time code first half, 14 bits
$thisfile_ac3['timecode1'] = 0;
- $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x3E00) >> 9) * 3600; // The first 5 bits of this 14-bit field represent the time in hours, with valid values of 0\9623
- $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x01F8) >> 3) * 60; // The next 6 bits represent the time in minutes, with valid values of 0\9659
- $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x0003) >> 0) * 8; // The final 3 bits represents the time in 8 second increments, with valid values of 0\967 (representing 0, 8, 16, ... 56 seconds)
+ $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x3E00) >> 9) * 3600; // The first 5 bits of this 14-bit field represent the time in hours, with valid values of 0�23
+ $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x01F8) >> 3) * 60; // The next 6 bits represent the time in minutes, with valid values of 0�59
+ $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x0003) >> 0) * 8; // The final 3 bits represents the time in 8 second increments, with valid values of 0�7 (representing 0, 8, 16, ... 56 seconds)
}
if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x02) {
$thisfile_ac3_raw_bsi['timecod2'] = $this->readHeaderBSI(14); // 5.4.2.28 timecod2: Time code second half, 14 bits
$thisfile_ac3['timecode2'] = 0;
- $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x3800) >> 11) * 1; // The first 3 bits of this 14-bit field represent the time in seconds, with valid values from 0\967 (representing 0-7 seconds)
- $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x07C0) >> 6) * (1 / 30); // The next 5 bits represents the time in frames, with valid values from 0\9629 (one frame = 1/30th of a second)
- $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x003F) >> 0) * ((1 / 30) / 60); // The final 6 bits represents fractions of 1/64 of a frame, with valid values from 0\9663
+ $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x3800) >> 11) * 1; // The first 3 bits of this 14-bit field represent the time in seconds, with valid values from 0�7 (representing 0-7 seconds)
+ $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x07C0) >> 6) * (1 / 30); // The next 5 bits represents the time in frames, with valid values from 0�29 (one frame = 1/30th of a second)
+ $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x003F) >> 0) * ((1 / 30) / 60); // The final 6 bits represents fractions of 1/64 of a frame, with valid values from 0�63
}
$thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1);
if ($thisfile_ac3_raw_bsi['flags']['addbsi']) {
- $thisfile_ac3_raw_bsi['addbsi_length'] = $this->readHeaderBSI(6) + 1; // This 6-bit code, which exists only if addbside is a 1, indicates the length in bytes of additional bit stream information. The valid range of addbsil is 0\9663, indicating 1\9664 additional bytes, respectively.
+ $thisfile_ac3_raw_bsi['addbsi_length'] = $this->readHeaderBSI(6) + 1; // This 6-bit code, which exists only if addbside is a 1, indicates the length in bytes of additional bit stream information. The valid range of addbsil is 0�63, indicating 1�64 additional bytes, respectively.
$this->AC3header['bsi'] .= getid3_lib::BigEndian2Bin($this->fread($thisfile_ac3_raw_bsi['addbsi_length']));
} elseif ($thisfile_ac3_raw_bsi['bsid'] <= 16) { // E-AC3
-$this->error('E-AC3 parsing is incomplete and experimental in this version of getID3 ('.$this->getid3->version().'). Notably the bitrate calculations are wrong -- value might (or not) be correct, but it is not calculated correctly. Email info@getid3.org if you know how to calculate EAC3 bitrate correctly.');
+ $this->error('E-AC3 parsing is incomplete and experimental in this version of getID3 ('.$this->getid3->version().'). Notably the bitrate calculations are wrong -- value might (or not) be correct, but it is not calculated correctly. Email info@getid3.org if you know how to calculate EAC3 bitrate correctly.');
$info['audio']['dataformat'] = 'eac3';
$thisfile_ac3_raw_bsi['strmtyp'] = $this->readHeaderBSI(2);
$thisfile_ac3['frame_length'] = self::frameSizeLookup($thisfile_ac3_raw_bsi['frmsizecod'], $thisfile_ac3_raw_bsi['fscod']);
$thisfile_ac3['bitrate'] = self::bitrateLookup($thisfile_ac3_raw_bsi['frmsizecod']);
} elseif (!empty($thisfile_ac3_raw_bsi['frmsiz'])) {
-// this isn't right, but it's (usually) close, roughly 5% less than it should be.
-// but WHERE is the actual bitrate value stored in EAC3?? email info@getid3.org if you know!
+ // this isn't right, but it's (usually) close, roughly 5% less than it should be.
+ // but WHERE is the actual bitrate value stored in EAC3?? email info@getid3.org if you know!
$thisfile_ac3['bitrate'] = ($thisfile_ac3_raw_bsi['frmsiz'] + 1) * 16 * 30; // The frmsiz field shall contain a value one less than the overall size of the coded syncframe in 16-bit words. That is, this field may assume a value ranging from 0 to 2047, and these values correspond to syncframe sizes ranging from 1 to 2048.
-// kludge-fix to make it approximately the expected value, still not "right":
-$thisfile_ac3['bitrate'] = round(($thisfile_ac3['bitrate'] * 1.05) / 16000) * 16000;
+ // kludge-fix to make it approximately the expected value, still not "right":
+ $thisfile_ac3['bitrate'] = round(($thisfile_ac3['bitrate'] * 1.05) / 16000) * 16000;
}
$info['audio']['bitrate'] = $thisfile_ac3['bitrate'];
- $thisfile_ac3['service_type'] = self::serviceTypeLookup($thisfile_ac3_raw_bsi['bsmod'], $thisfile_ac3_raw_bsi['acmod']);
+ if (isset($thisfile_ac3_raw_bsi['bsmod']) && isset($thisfile_ac3_raw_bsi['acmod'])) {
+ $thisfile_ac3['service_type'] = self::serviceTypeLookup($thisfile_ac3_raw_bsi['bsmod'], $thisfile_ac3_raw_bsi['acmod']);
+ }
$ac3_coding_mode = self::audioCodingModeLookup($thisfile_ac3_raw_bsi['acmod']);
foreach($ac3_coding_mode as $key => $value) {
$thisfile_ac3[$key] = $value;
return true;
}
+ /**
+ * @param int $length
+ *
+ * @return float|int
+ */
private function readHeaderBSI($length) {
$data = substr($this->AC3header['bsi'], $this->BSIoffset, $length);
$this->BSIoffset += $length;
return bindec($data);
}
+ /**
+ * @param int $fscod
+ *
+ * @return int|string|false
+ */
public static function sampleRateCodeLookup($fscod) {
static $sampleRateCodeLookup = array(
0 => 48000,
return (isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false);
}
+ /**
+ * @param int $fscod2
+ *
+ * @return int|string|false
+ */
public static function sampleRateCodeLookup2($fscod2) {
static $sampleRateCodeLookup2 = array(
0 => 24000,
return (isset($sampleRateCodeLookup2[$fscod2]) ? $sampleRateCodeLookup2[$fscod2] : false);
}
+ /**
+ * @param int $bsmod
+ * @param int $acmod
+ *
+ * @return string|false
+ */
public static function serviceTypeLookup($bsmod, $acmod) {
static $serviceTypeLookup = array();
if (empty($serviceTypeLookup)) {
return (isset($serviceTypeLookup[$bsmod][$acmod]) ? $serviceTypeLookup[$bsmod][$acmod] : false);
}
+ /**
+ * @param int $acmod
+ *
+ * @return array|false
+ */
public static function audioCodingModeLookup($acmod) {
// array(channel configuration, # channels (not incl LFE), channel order)
static $audioCodingModeLookup = array (
return (isset($audioCodingModeLookup[$acmod]) ? $audioCodingModeLookup[$acmod] : false);
}
+ /**
+ * @param int $cmixlev
+ *
+ * @return int|float|string|false
+ */
public static function centerMixLevelLookup($cmixlev) {
static $centerMixLevelLookup;
if (empty($centerMixLevelLookup)) {
return (isset($centerMixLevelLookup[$cmixlev]) ? $centerMixLevelLookup[$cmixlev] : false);
}
+ /**
+ * @param int $surmixlev
+ *
+ * @return int|float|string|false
+ */
public static function surroundMixLevelLookup($surmixlev) {
static $surroundMixLevelLookup;
if (empty($surroundMixLevelLookup)) {
return (isset($surroundMixLevelLookup[$surmixlev]) ? $surroundMixLevelLookup[$surmixlev] : false);
}
+ /**
+ * @param int $dsurmod
+ *
+ * @return string|false
+ */
public static function dolbySurroundModeLookup($dsurmod) {
static $dolbySurroundModeLookup = array(
0 => 'not indicated',
return (isset($dolbySurroundModeLookup[$dsurmod]) ? $dolbySurroundModeLookup[$dsurmod] : false);
}
+ /**
+ * @param int $acmod
+ * @param bool $lfeon
+ *
+ * @return array
+ */
public static function channelsEnabledLookup($acmod, $lfeon) {
$lookup = array(
- 'ch1'=>(bool) ($acmod == 0),
- 'ch2'=>(bool) ($acmod == 0),
- 'left'=>(bool) ($acmod > 1),
- 'right'=>(bool) ($acmod > 1),
+ 'ch1'=>($acmod == 0),
+ 'ch2'=>($acmod == 0),
+ 'left'=>($acmod > 1),
+ 'right'=>($acmod > 1),
'center'=>(bool) ($acmod & 0x01),
'surround_mono'=>false,
'surround_left'=>false,
return $lookup;
}
+ /**
+ * @param int $compre
+ *
+ * @return float|int
+ */
public static function heavyCompression($compre) {
// The first four bits indicate gain changes in 6.02dB increments which can be
// implemented with an arithmetic shift operation. The following four bits
return $log_gain - $lin_gain;
}
+ /**
+ * @param int $roomtyp
+ *
+ * @return string|false
+ */
public static function roomTypeLookup($roomtyp) {
static $roomTypeLookup = array(
0 => 'not indicated',
return (isset($roomTypeLookup[$roomtyp]) ? $roomTypeLookup[$roomtyp] : false);
}
+ /**
+ * @param int $frmsizecod
+ * @param int $fscod
+ *
+ * @return int|false
+ */
public static function frameSizeLookup($frmsizecod, $fscod) {
// LSB is whether padding is used or not
$padding = (bool) ($frmsizecod & 0x01);
return (isset($frameSizeLookup[$framesizeid][$fscod]) ? $frameSizeLookup[$framesizeid][$fscod] : false);
}
+ /**
+ * @param int $frmsizecod
+ *
+ * @return int|false
+ */
public static function bitrateLookup($frmsizecod) {
// LSB is whether padding is used or not
$padding = (bool) ($frmsizecod & 0x01);
return (isset($bitrateLookup[$framesizeid]) ? $bitrateLookup[$framesizeid] : false);
}
+ /**
+ * @param int $numblkscod
+ *
+ * @return int|false
+ */
public static function blocksPerSyncFrame($numblkscod) {
static $blocksPerSyncFrameLookup = array(
0 => 1,
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