<?php

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/////////////////////////////////////////////////////////////////

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/// getID3() by James Heinrich <info@getid3.org> //

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// available at https://github.com/JamesHeinrich/getID3 //

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// or https://www.getid3.org //

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// or http://getid3.sourceforge.net //

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// see readme.txt for more details //

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/////////////////////////////////////////////////////////////////

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// //

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// module.audio.ac3.php //

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// module for analyzing AC-3 (aka Dolby Digital) audio files //

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// dependencies: NONE //

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// ///

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/////////////////////////////////////////////////////////////////

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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers

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exit;

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}

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class getid3_ac3 extends getid3_handler

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{

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/**

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* @var array

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*/

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private $AC3header = array();

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/**

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* @var int

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*/

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private $BSIoffset = 0;

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const syncword = 0x0B77;

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/**

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* @return bool

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*/

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public function Analyze() {

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$info = &$this->getid3->info;

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///AH

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$info['ac3']['raw']['bsi'] = array();

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$thisfile_ac3 = &$info['ac3'];

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$thisfile_ac3_raw = &$thisfile_ac3['raw'];

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$thisfile_ac3_raw_bsi = &$thisfile_ac3_raw['bsi'];

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// http://www.atsc.org/standards/a_52a.pdf

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$info['fileformat'] = 'ac3';

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// An AC-3 serial coded audio bit stream is made up of a sequence of synchronization frames

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// Each synchronization frame contains 6 coded audio blocks (AB), each of which represent 256

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// new audio samples per channel. A synchronization information (SI) header at the beginning

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// of each frame contains information needed to acquire and maintain synchronization. A

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// bit stream information (BSI) header follows SI, and contains parameters describing the coded

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// audio service. The coded audio blocks may be followed by an auxiliary data (Aux) field. At the

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// end of each frame is an error check field that includes a CRC word for error detection. An

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// additional CRC word is located in the SI header, the use of which, by a decoder, is optional.

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//

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// syncinfo() | bsi() | AB0 | AB1 | AB2 | AB3 | AB4 | AB5 | Aux | CRC

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// syncinfo() {

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// syncword 16

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// crc1 16

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// fscod 2

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// frmsizecod 6

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// } /* end of syncinfo */

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$this->fseek($info['avdataoffset']);

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$tempAC3header = $this->fread(100); // should be enough to cover all data, there are some variable-length fields...?

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$this->AC3header['syncinfo'] = getid3_lib::BigEndian2Int(substr($tempAC3header, 0, 2));

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$this->AC3header['bsi'] = getid3_lib::BigEndian2Bin(substr($tempAC3header, 2));

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$thisfile_ac3_raw_bsi['bsid'] = (getid3_lib::LittleEndian2Int(substr($tempAC3header, 5, 1)) & 0xF8) >> 3; // AC3 and E-AC3 put the "bsid" version identifier in the same place, but unfortnately the 4 bytes between the syncword and the version identifier are interpreted differently, so grab it here so the following code structure can make sense

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unset($tempAC3header);

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if ($this->AC3header['syncinfo'] !== self::syncword) {

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if (!$this->isDependencyFor('matroska')) {

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unset($info['fileformat'], $info['ac3']);

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return $this->error('Expecting "'.dechex(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.dechex($this->AC3header['syncinfo']).'"');

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}

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}

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$info['audio']['dataformat'] = 'ac3';

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$info['audio']['bitrate_mode'] = 'cbr';

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$info['audio']['lossless'] = false;

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if ($thisfile_ac3_raw_bsi['bsid'] <= 8) {

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$thisfile_ac3_raw_bsi['crc1'] = getid3_lib::Bin2Dec($this->readHeaderBSI(16));

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$thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2); // 5.4.1.3

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$thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6); // 5.4.1.4

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if ($thisfile_ac3_raw_bsi['frmsizecod'] > 37) { // binary: 100101 - see Table 5.18 Frame Size Code Table (1 word = 16 bits)

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$this->warning('Unexpected ac3.bsi.frmsizecod value: '.$thisfile_ac3_raw_bsi['frmsizecod'].', bitrate not set correctly');

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}

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$thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended

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$thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3);

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$thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3);

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if ($thisfile_ac3_raw_bsi['acmod'] & 0x01) {

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// If the lsb of acmod is a 1, center channel is in use and cmixlev follows in the bit stream.

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$thisfile_ac3_raw_bsi['cmixlev'] = $this->readHeaderBSI(2);

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$thisfile_ac3['center_mix_level'] = self::centerMixLevelLookup($thisfile_ac3_raw_bsi['cmixlev']);

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}

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if ($thisfile_ac3_raw_bsi['acmod'] & 0x04) {

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// If the msb of acmod is a 1, surround channels are in use and surmixlev follows in the bit stream.

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$thisfile_ac3_raw_bsi['surmixlev'] = $this->readHeaderBSI(2);

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$thisfile_ac3['surround_mix_level'] = self::surroundMixLevelLookup($thisfile_ac3_raw_bsi['surmixlev']);

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}

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if ($thisfile_ac3_raw_bsi['acmod'] == 0x02) {

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// When operating in the two channel mode, this 2-bit code indicates whether or not the program has been encoded in Dolby Surround.

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$thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2);

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$thisfile_ac3['dolby_surround_mode'] = self::dolbySurroundModeLookup($thisfile_ac3_raw_bsi['dsurmod']);

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}

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$thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1);

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// This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31.

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// The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent.

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$thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5); // 5.4.2.8 dialnorm: Dialogue Normalization, 5 Bits

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$thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1); // 5.4.2.9 compre: Compression Gain Word Exists, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['compr']) {

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$thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8); // 5.4.2.10 compr: Compression Gain Word, 8 Bits

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$thisfile_ac3['heavy_compression'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr']);

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}

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$thisfile_ac3_raw_bsi['flags']['langcod'] = (bool) $this->readHeaderBSI(1); // 5.4.2.11 langcode: Language Code Exists, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['langcod']) {

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$thisfile_ac3_raw_bsi['langcod'] = $this->readHeaderBSI(8); // 5.4.2.12 langcod: Language Code, 8 Bits

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}

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$thisfile_ac3_raw_bsi['flags']['audprodinfo'] = (bool) $this->readHeaderBSI(1); // 5.4.2.13 audprodie: Audio Production Information Exists, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['audprodinfo']) {

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$thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5); // 5.4.2.14 mixlevel: Mixing Level, 5 Bits

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$thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2); // 5.4.2.15 roomtyp: Room Type, 2 Bits

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$thisfile_ac3['mixing_level'] = (80 + $thisfile_ac3_raw_bsi['mixlevel']).'dB';

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$thisfile_ac3['room_type'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp']);

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}

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$thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5); // 5.4.2.16 dialnorm2: Dialogue Normalization, ch2, 5 Bits

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$thisfile_ac3['dialogue_normalization2'] = '-'.$thisfile_ac3_raw_bsi['dialnorm2'].'dB'; // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31. The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent.

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$thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.17 compr2e: Compression Gain Word Exists, ch2, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['compr2']) {

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$thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8); // 5.4.2.18 compr2: Compression Gain Word, ch2, 8 Bits

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$thisfile_ac3['heavy_compression2'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr2']);

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}

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$thisfile_ac3_raw_bsi['flags']['langcod2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.19 langcod2e: Language Code Exists, ch2, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['langcod2']) {

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$thisfile_ac3_raw_bsi['langcod2'] = $this->readHeaderBSI(8); // 5.4.2.20 langcod2: Language Code, ch2, 8 Bits

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}

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$thisfile_ac3_raw_bsi['flags']['audprodinfo2'] = (bool) $this->readHeaderBSI(1); // 5.4.2.21 audprodi2e: Audio Production Information Exists, ch2, 1 Bit

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if ($thisfile_ac3_raw_bsi['flags']['audprodinfo2']) {

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$thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5); // 5.4.2.22 mixlevel2: Mixing Level, ch2, 5 Bits

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$thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2); // 5.4.2.23 roomtyp2: Room Type, ch2, 2 Bits

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$thisfile_ac3['mixing_level2'] = (80 + $thisfile_ac3_raw_bsi['mixlevel2']).'dB';

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$thisfile_ac3['room_type2'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp2']);

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}

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$thisfile_ac3_raw_bsi['copyright'] = (bool) $this->readHeaderBSI(1); // 5.4.2.24 copyrightb: Copyright Bit, 1 Bit

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$thisfile_ac3_raw_bsi['original'] = (bool) $this->readHeaderBSI(1); // 5.4.2.25 origbs: Original Bit Stream, 1 Bit

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$thisfile_ac3_raw_bsi['flags']['timecod1'] = $this->readHeaderBSI(2); // 5.4.2.26 timecod1e, timcode2e: Time Code (first and second) Halves Exist, 2 Bits

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if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x01) {

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$thisfile_ac3_raw_bsi['timecod1'] = $this->readHeaderBSI(14); // 5.4.2.27 timecod1: Time code first half, 14 bits

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$thisfile_ac3['timecode1'] = 0;

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$thisfile_ac3['timecode1'] += (($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

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$thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x01F8) >> 3) * 60; // The next 6 bits represent the time in minutes, with valid values of 0�59

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$thisfile_ac3['timecode1'] += (($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)

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}

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if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x02) {

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$thisfile_ac3_raw_bsi['timecod2'] = $this->readHeaderBSI(14); // 5.4.2.28 timecod2: Time code second half, 14 bits

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$thisfile_ac3['timecode2'] = 0;

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$thisfile_ac3['timecode2'] += (($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)

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$thisfile_ac3['timecode2'] += (($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)

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$thisfile_ac3['timecode2'] += (($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

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}

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$thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['addbsi']) {

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$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.

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$this->AC3header['bsi'] .= getid3_lib::BigEndian2Bin($this->fread($thisfile_ac3_raw_bsi['addbsi_length']));

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$thisfile_ac3_raw_bsi['addbsi_data'] = substr($this->AC3header['bsi'], $this->BSIoffset, $thisfile_ac3_raw_bsi['addbsi_length'] * 8);

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$this->BSIoffset += $thisfile_ac3_raw_bsi['addbsi_length'] * 8;

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}

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} elseif ($thisfile_ac3_raw_bsi['bsid'] <= 16) { // E-AC3

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$this->error('E-AC3 parsing is incomplete and experimental in this version of getID3 ('.$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.');

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$info['audio']['dataformat'] = 'eac3';

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$thisfile_ac3_raw_bsi['strmtyp'] = $this->readHeaderBSI(2);

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$thisfile_ac3_raw_bsi['substreamid'] = $this->readHeaderBSI(3);

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$thisfile_ac3_raw_bsi['frmsiz'] = $this->readHeaderBSI(11);

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$thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2);

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if ($thisfile_ac3_raw_bsi['fscod'] == 3) {

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$thisfile_ac3_raw_bsi['fscod2'] = $this->readHeaderBSI(2);

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$thisfile_ac3_raw_bsi['numblkscod'] = 3; // six blocks per syncframe

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} else {

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$thisfile_ac3_raw_bsi['numblkscod'] = $this->readHeaderBSI(2);

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}

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$thisfile_ac3['bsi']['blocks_per_sync_frame'] = self::blocksPerSyncFrame($thisfile_ac3_raw_bsi['numblkscod']);

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$thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3);

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$thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1);

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$thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended

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$thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5);

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$thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['compr']) {

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$thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8);

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}

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if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value)

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$thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5);

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$thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['compr2']) {

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$thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8);

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}

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}

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if ($thisfile_ac3_raw_bsi['strmtyp'] == 1) { // if dependent stream

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$thisfile_ac3_raw_bsi['flags']['chanmap'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['chanmap']) {

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$thisfile_ac3_raw_bsi['chanmap'] = $this->readHeaderBSI(8);

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}

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}

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$thisfile_ac3_raw_bsi['flags']['mixmdat'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['mixmdat']) { // Mixing metadata

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if ($thisfile_ac3_raw_bsi['acmod'] > 2) { // if more than 2 channels

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$thisfile_ac3_raw_bsi['dmixmod'] = $this->readHeaderBSI(2);

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}

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if (($thisfile_ac3_raw_bsi['acmod'] & 0x01) && ($thisfile_ac3_raw_bsi['acmod'] > 2)) { // if three front channels exist

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$thisfile_ac3_raw_bsi['ltrtcmixlev'] = $this->readHeaderBSI(3);

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$thisfile_ac3_raw_bsi['lorocmixlev'] = $this->readHeaderBSI(3);

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}

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if ($thisfile_ac3_raw_bsi['acmod'] & 0x04) { // if a surround channel exists

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$thisfile_ac3_raw_bsi['ltrtsurmixlev'] = $this->readHeaderBSI(3);

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$thisfile_ac3_raw_bsi['lorosurmixlev'] = $this->readHeaderBSI(3);

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}

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if ($thisfile_ac3_raw_bsi['flags']['lfeon']) { // if the LFE channel exists

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$thisfile_ac3_raw_bsi['flags']['lfemixlevcod'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['lfemixlevcod']) {

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$thisfile_ac3_raw_bsi['lfemixlevcod'] = $this->readHeaderBSI(5);

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}

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}

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if ($thisfile_ac3_raw_bsi['strmtyp'] == 0) { // if independent stream

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$thisfile_ac3_raw_bsi['flags']['pgmscl'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['pgmscl']) {

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$thisfile_ac3_raw_bsi['pgmscl'] = $this->readHeaderBSI(6);

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}

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if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value)

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$thisfile_ac3_raw_bsi['flags']['pgmscl2'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['pgmscl2']) {

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$thisfile_ac3_raw_bsi['pgmscl2'] = $this->readHeaderBSI(6);

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}

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}

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$thisfile_ac3_raw_bsi['flags']['extpgmscl'] = (bool) $this->readHeaderBSI(1);

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if ($thisfile_ac3_raw_bsi['flags']['extpgmscl']) {

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$thisfile_ac3_raw_bsi['extpgmscl'] = $this->readHeaderBSI(6);

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}

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$thisfile_ac3_raw_bsi['mixdef'] = $this->readHeaderBSI(2);

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if ($thisfile_ac3_raw_bsi['mixdef'] == 1) { // mixing option 2

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$thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1);

[273] Fix | Delete

$thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1);

[274] Fix | Delete

$thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3);

[275] Fix | Delete

} elseif ($thisfile_ac3_raw_bsi['mixdef'] == 2) { // mixing option 3

[276] Fix | Delete

$thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI(12);

[277] Fix | Delete

} elseif ($thisfile_ac3_raw_bsi['mixdef'] == 3) { // mixing option 4

[278] Fix | Delete

$mixdefbitsread = 0;

[279] Fix | Delete

$thisfile_ac3_raw_bsi['mixdeflen'] = $this->readHeaderBSI(5); $mixdefbitsread += 5;

[280] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['mixdata2'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[281] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['mixdata2']) {

[282] Fix | Delete

$thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[283] Fix | Delete

$thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[284] Fix | Delete

$thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3); $mixdefbitsread += 3;

[285] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmlscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[286] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmlscl']) {

[287] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmlscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[288] Fix | Delete

}

[289] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmcscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[290] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmcscl']) {

[291] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmcscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[292] Fix | Delete

}

[293] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmrscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[294] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmrscl']) {

[295] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmrscl'] = $this->readHeaderBSI(4);

[296] Fix | Delete

}

[297] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmlsscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[298] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmlsscl']) {

[299] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmlsscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[300] Fix | Delete

}

[301] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmrsscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[302] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmrsscl']) {

[303] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmrsscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[304] Fix | Delete

}

[305] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmlfescl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[306] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmlfescl']) {

[307] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmlfescl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[308] Fix | Delete

}

[309] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['dmixscl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[310] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['dmixscl']) {

[311] Fix | Delete

$thisfile_ac3_raw_bsi['dmixscl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[312] Fix | Delete

}

[313] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['addch'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[314] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['addch']) {

[315] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmaux1scl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[316] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmaux1scl']) {

[317] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmaux1scl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[318] Fix | Delete

}

[319] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['extpgmaux2scl'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[320] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['extpgmaux2scl']) {

[321] Fix | Delete

$thisfile_ac3_raw_bsi['extpgmaux2scl'] = $this->readHeaderBSI(4); $mixdefbitsread += 4;

[322] Fix | Delete

}

[323] Fix | Delete

}

[324] Fix | Delete

}

[325] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['mixdata3'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[326] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['mixdata3']) {

[327] Fix | Delete

$thisfile_ac3_raw_bsi['spchdat'] = $this->readHeaderBSI(5); $mixdefbitsread += 5;

[328] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['addspchdat'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[329] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['addspchdat']) {

[330] Fix | Delete

$thisfile_ac3_raw_bsi['spchdat1'] = $this->readHeaderBSI(5); $mixdefbitsread += 5;

[331] Fix | Delete

$thisfile_ac3_raw_bsi['spchan1att'] = $this->readHeaderBSI(2); $mixdefbitsread += 2;

[332] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['addspchdat1'] = (bool) $this->readHeaderBSI(1); $mixdefbitsread += 1;

[333] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['addspchdat1']) {

[334] Fix | Delete

$thisfile_ac3_raw_bsi['spchdat2'] = $this->readHeaderBSI(5); $mixdefbitsread += 5;

[335] Fix | Delete

$thisfile_ac3_raw_bsi['spchan2att'] = $this->readHeaderBSI(3); $mixdefbitsread += 3;

[336] Fix | Delete

}

[337] Fix | Delete

}

[338] Fix | Delete

}

[339] Fix | Delete

$mixdata_bits = (8 * ($thisfile_ac3_raw_bsi['mixdeflen'] + 2)) - $mixdefbitsread;

[340] Fix | Delete

$mixdata_fill = (($mixdata_bits % 8) ? 8 - ($mixdata_bits % 8) : 0);

[341] Fix | Delete

$thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI($mixdata_bits);

[342] Fix | Delete

$thisfile_ac3_raw_bsi['mixdatafill'] = $this->readHeaderBSI($mixdata_fill);

[343] Fix | Delete

unset($mixdefbitsread, $mixdata_bits, $mixdata_fill);

[344] Fix | Delete

}

[345] Fix | Delete

if ($thisfile_ac3_raw_bsi['acmod'] < 2) { // if mono or dual mono source

[346] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['paninfo'] = (bool) $this->readHeaderBSI(1);

[347] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['paninfo']) {

[348] Fix | Delete

$thisfile_ac3_raw_bsi['panmean'] = $this->readHeaderBSI(8);

[349] Fix | Delete

$thisfile_ac3_raw_bsi['paninfo'] = $this->readHeaderBSI(6);

[350] Fix | Delete

}

[351] Fix | Delete

if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value)

[352] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['paninfo2'] = (bool) $this->readHeaderBSI(1);

[353] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['paninfo2']) {

[354] Fix | Delete

$thisfile_ac3_raw_bsi['panmean2'] = $this->readHeaderBSI(8);

[355] Fix | Delete

$thisfile_ac3_raw_bsi['paninfo2'] = $this->readHeaderBSI(6);

[356] Fix | Delete

}

[357] Fix | Delete

}

[358] Fix | Delete

}

[359] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['frmmixcfginfo'] = (bool) $this->readHeaderBSI(1);

[360] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['frmmixcfginfo']) { // mixing configuration information

[361] Fix | Delete

if ($thisfile_ac3_raw_bsi['numblkscod'] == 0) {

[362] Fix | Delete

$thisfile_ac3_raw_bsi['blkmixcfginfo'][0] = $this->readHeaderBSI(5);

[363] Fix | Delete

} else {

[364] Fix | Delete

for ($blk = 0; $blk < $thisfile_ac3_raw_bsi['numblkscod']; $blk++) {

[365] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['blkmixcfginfo'.$blk] = (bool) $this->readHeaderBSI(1);

[366] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['blkmixcfginfo'.$blk]) { // mixing configuration information

[367] Fix | Delete

$thisfile_ac3_raw_bsi['blkmixcfginfo'][$blk] = $this->readHeaderBSI(5);

[368] Fix | Delete

}

[369] Fix | Delete

}

[370] Fix | Delete

}

[371] Fix | Delete

}

[372] Fix | Delete

}

[373] Fix | Delete

}

[374] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['infomdat'] = (bool) $this->readHeaderBSI(1);

[375] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['infomdat']) { // Informational metadata

[376] Fix | Delete

$thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3);

[377] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['copyrightb'] = (bool) $this->readHeaderBSI(1);

[378] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['origbs'] = (bool) $this->readHeaderBSI(1);

[379] Fix | Delete

if ($thisfile_ac3_raw_bsi['acmod'] == 2) { // if in 2/0 mode

[380] Fix | Delete

$thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2);

[381] Fix | Delete

$thisfile_ac3_raw_bsi['dheadphonmod'] = $this->readHeaderBSI(2);

[382] Fix | Delete

}

[383] Fix | Delete

if ($thisfile_ac3_raw_bsi['acmod'] >= 6) { // if both surround channels exist

[384] Fix | Delete

$thisfile_ac3_raw_bsi['dsurexmod'] = $this->readHeaderBSI(2);

[385] Fix | Delete

}

[386] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['audprodi'] = (bool) $this->readHeaderBSI(1);

[387] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['audprodi']) {

[388] Fix | Delete

$thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5);

[389] Fix | Delete

$thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2);

[390] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['adconvtyp'] = (bool) $this->readHeaderBSI(1);

[391] Fix | Delete

}

[392] Fix | Delete

if ($thisfile_ac3_raw_bsi['acmod'] == 0) { // if 1+1 mode (dual mono, so some items need a second value)

[393] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['audprodi2'] = (bool) $this->readHeaderBSI(1);

[394] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['audprodi2']) {

[395] Fix | Delete

$thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5);

[396] Fix | Delete

$thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2);

[397] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['adconvtyp2'] = (bool) $this->readHeaderBSI(1);

[398] Fix | Delete

}

[399] Fix | Delete

}

[400] Fix | Delete

if ($thisfile_ac3_raw_bsi['fscod'] < 3) { // if not half sample rate

[401] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['sourcefscod'] = (bool) $this->readHeaderBSI(1);

[402] Fix | Delete

}

[403] Fix | Delete

}

[404] Fix | Delete

if (($thisfile_ac3_raw_bsi['strmtyp'] == 0) && ($thisfile_ac3_raw_bsi['numblkscod'] != 3)) { // if both surround channels exist

[405] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['convsync'] = (bool) $this->readHeaderBSI(1);

[406] Fix | Delete

}

[407] Fix | Delete

if ($thisfile_ac3_raw_bsi['strmtyp'] == 2) { // if bit stream converted from AC-3

[408] Fix | Delete

if ($thisfile_ac3_raw_bsi['numblkscod'] != 3) { // 6 blocks per syncframe

[409] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['blkid'] = 1;

[410] Fix | Delete

} else {

[411] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['blkid'] = (bool) $this->readHeaderBSI(1);

[412] Fix | Delete

}

[413] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['blkid']) {

[414] Fix | Delete

$thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6);

[415] Fix | Delete

}

[416] Fix | Delete

}

[417] Fix | Delete

$thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1);

[418] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['addbsi']) {

[419] Fix | Delete

$thisfile_ac3_raw_bsi['addbsil'] = $this->readHeaderBSI(6);

[420] Fix | Delete

$thisfile_ac3_raw_bsi['addbsi'] = $this->readHeaderBSI(($thisfile_ac3_raw_bsi['addbsil'] + 1) * 8);

[421] Fix | Delete

}

[422] Fix | Delete

[423] Fix | Delete

} else {

[424] Fix | Delete

[425] Fix | Delete

$this->error('Bit stream identification is version '.$thisfile_ac3_raw_bsi['bsid'].', but getID3() only understands up to version 16. Please submit a support ticket with a sample file.');

[426] Fix | Delete

unset($info['ac3']);

[427] Fix | Delete

return false;

[428] Fix | Delete

[429] Fix | Delete

}

[430] Fix | Delete

[431] Fix | Delete

if (isset($thisfile_ac3_raw_bsi['fscod2'])) {

[432] Fix | Delete

$thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup2($thisfile_ac3_raw_bsi['fscod2']);

[433] Fix | Delete

} else {

[434] Fix | Delete

$thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup($thisfile_ac3_raw_bsi['fscod']);

[435] Fix | Delete

}

[436] Fix | Delete

if ($thisfile_ac3_raw_bsi['fscod'] <= 3) {

[437] Fix | Delete

$info['audio']['sample_rate'] = $thisfile_ac3['sample_rate'];

[438] Fix | Delete

} else {

[439] Fix | Delete

$this->warning('Unexpected ac3.bsi.fscod value: '.$thisfile_ac3_raw_bsi['fscod']);

[440] Fix | Delete

}

[441] Fix | Delete

if (isset($thisfile_ac3_raw_bsi['frmsizecod'])) {

[442] Fix | Delete

$thisfile_ac3['frame_length'] = self::frameSizeLookup($thisfile_ac3_raw_bsi['frmsizecod'], $thisfile_ac3_raw_bsi['fscod']);

[443] Fix | Delete

$thisfile_ac3['bitrate'] = self::bitrateLookup($thisfile_ac3_raw_bsi['frmsizecod']);

[444] Fix | Delete

} elseif (!empty($thisfile_ac3_raw_bsi['frmsiz'])) {

[445] Fix | Delete

// this isn't right, but it's (usually) close, roughly 5% less than it should be.

[446] Fix | Delete

// but WHERE is the actual bitrate value stored in EAC3?? email info@getid3.org if you know!

[447] Fix | Delete

$thisfile_ac3['bitrate'] = ($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.

[448] Fix | Delete

// kludge-fix to make it approximately the expected value, still not "right":

[449] Fix | Delete

$thisfile_ac3['bitrate'] = round(($thisfile_ac3['bitrate'] * 1.05) / 16000) * 16000;

[450] Fix | Delete

}

[451] Fix | Delete

$info['audio']['bitrate'] = $thisfile_ac3['bitrate'];

[452] Fix | Delete

[453] Fix | Delete

if (isset($thisfile_ac3_raw_bsi['bsmod']) && isset($thisfile_ac3_raw_bsi['acmod'])) {

[454] Fix | Delete

$thisfile_ac3['service_type'] = self::serviceTypeLookup($thisfile_ac3_raw_bsi['bsmod'], $thisfile_ac3_raw_bsi['acmod']);

[455] Fix | Delete

}

[456] Fix | Delete

$ac3_coding_mode = self::audioCodingModeLookup($thisfile_ac3_raw_bsi['acmod']);

[457] Fix | Delete

foreach($ac3_coding_mode as $key => $value) {

[458] Fix | Delete

$thisfile_ac3[$key] = $value;

[459] Fix | Delete

}

[460] Fix | Delete

switch ($thisfile_ac3_raw_bsi['acmod']) {

[461] Fix | Delete

case 0:

[462] Fix | Delete

case 1:

[463] Fix | Delete

$info['audio']['channelmode'] = 'mono';

[464] Fix | Delete

break;

[465] Fix | Delete

case 3:

[466] Fix | Delete

case 4:

[467] Fix | Delete

$info['audio']['channelmode'] = 'stereo';

[468] Fix | Delete

break;

[469] Fix | Delete

default:

[470] Fix | Delete

$info['audio']['channelmode'] = 'surround';

[471] Fix | Delete

break;

[472] Fix | Delete

}

[473] Fix | Delete

$info['audio']['channels'] = $thisfile_ac3['num_channels'];

[474] Fix | Delete

[475] Fix | Delete

$thisfile_ac3['lfe_enabled'] = $thisfile_ac3_raw_bsi['flags']['lfeon'];

[476] Fix | Delete

if ($thisfile_ac3_raw_bsi['flags']['lfeon']) {

[477] Fix | Delete

$info['audio']['channels'] .= '.1';

[478] Fix | Delete

}

[479] Fix | Delete

[480] Fix | Delete

$thisfile_ac3['channels_enabled'] = self::channelsEnabledLookup($thisfile_ac3_raw_bsi['acmod'], $thisfile_ac3_raw_bsi['flags']['lfeon']);

[481] Fix | Delete

$thisfile_ac3['dialogue_normalization'] = '-'.$thisfile_ac3_raw_bsi['dialnorm'].'dB';

[482] Fix | Delete

[483] Fix | Delete

return true;

[484] Fix | Delete

}

[485] Fix | Delete

[486] Fix | Delete

/**

[487] Fix | Delete

* @param int $length

[488] Fix | Delete

*

[489] Fix | Delete

* @return int

[490] Fix | Delete

*/

[491] Fix | Delete

private function readHeaderBSI($length) {

[492] Fix | Delete

$data = substr($this->AC3header['bsi'], $this->BSIoffset, $length);

[493] Fix | Delete

$this->BSIoffset += $length;

[494] Fix | Delete

[495] Fix | Delete

return bindec($data);

[496] Fix | Delete

}

[497] Fix | Delete

[498] Fix | Delete

/**

[499] Fix | Delete