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<?php

if (!defined('GETID3_INCLUDEPATH')) {
    exit;
}
class getid3_ac3 extends getid3_handler
{
    private $AC3header = array();
    private $BSIoffset = 0;
    const syncword = 0xb77;
    public function Analyze()
    {
        $info =& $this->getid3->info;
        $info['ac3']['raw']['bsi'] = array();
        $thisfile_ac3 =& $info['ac3'];
        $thisfile_ac3_raw =& $thisfile_ac3['raw'];
        $thisfile_ac3_raw_bsi =& $thisfile_ac3_raw['bsi'];
        $info['fileformat'] = 'ac3';
        $this->fseek($info['avdataoffset']);
        $tempAC3header = $this->fread(100);
        $this->AC3header['syncinfo'] = getid3_lib::BigEndian2Int(substr($tempAC3header, 0, 2));
        $this->AC3header['bsi'] = getid3_lib::BigEndian2Bin(substr($tempAC3header, 2));
        $thisfile_ac3_raw_bsi['bsid'] = (getid3_lib::LittleEndian2Int(substr($tempAC3header, 5, 1)) & 0xf8) >> 3;
        unset($tempAC3header);
        if ($this->AC3header['syncinfo'] !== self::syncword) {
            if (!$this->isDependencyFor('matroska')) {
                unset($info['fileformat'], $info['ac3']);
                return $this->error('Expecting "' . dechex(self::syncword) . '" at offset ' . $info['avdataoffset'] . ', found "' . dechex($this->AC3header['syncinfo']) . '"');
            }
        }
        $info['audio']['dataformat'] = 'ac3';
        $info['audio']['bitrate_mode'] = 'cbr';
        $info['audio']['lossless'] = false;
        if ($thisfile_ac3_raw_bsi['bsid'] <= 8) {
            $thisfile_ac3_raw_bsi['crc1'] = getid3_lib::Bin2Dec($this->readHeaderBSI(16));
            $thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2);
            $thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6);
            if ($thisfile_ac3_raw_bsi['frmsizecod'] > 37) {
                $this->warning('Unexpected ac3.bsi.frmsizecod value: ' . $thisfile_ac3_raw_bsi['frmsizecod'] . ', bitrate not set correctly');
            }
            $thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5);
            $thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3);
            $thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3);
            if ($thisfile_ac3_raw_bsi['acmod'] & 0x1) {
                $thisfile_ac3_raw_bsi['cmixlev'] = $this->readHeaderBSI(2);
                $thisfile_ac3['center_mix_level'] = self::centerMixLevelLookup($thisfile_ac3_raw_bsi['cmixlev']);
            }
            if ($thisfile_ac3_raw_bsi['acmod'] & 0x4) {
                $thisfile_ac3_raw_bsi['surmixlev'] = $this->readHeaderBSI(2);
                $thisfile_ac3['surround_mix_level'] = self::surroundMixLevelLookup($thisfile_ac3_raw_bsi['surmixlev']);
            }
            if ($thisfile_ac3_raw_bsi['acmod'] == 0x2) {
                $thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2);
                $thisfile_ac3['dolby_surround_mode'] = self::dolbySurroundModeLookup($thisfile_ac3_raw_bsi['dsurmod']);
            }
            $thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1);
            $thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5);
            $thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['compr']) {
                $thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8);
                $thisfile_ac3['heavy_compression'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr']);
            }
            $thisfile_ac3_raw_bsi['flags']['langcod'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['langcod']) {
                $thisfile_ac3_raw_bsi['langcod'] = $this->readHeaderBSI(8);
            }
            $thisfile_ac3_raw_bsi['flags']['audprodinfo'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['audprodinfo']) {
                $thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5);
                $thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2);
                $thisfile_ac3['mixing_level'] = 80 + $thisfile_ac3_raw_bsi['mixlevel'] . 'dB';
                $thisfile_ac3['room_type'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp']);
            }
            $thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5);
            $thisfile_ac3['dialogue_normalization2'] = '-' . $thisfile_ac3_raw_bsi['dialnorm2'] . 'dB';
            $thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['compr2']) {
                $thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8);
                $thisfile_ac3['heavy_compression2'] = self::heavyCompression($thisfile_ac3_raw_bsi['compr2']);
            }
            $thisfile_ac3_raw_bsi['flags']['langcod2'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['langcod2']) {
                $thisfile_ac3_raw_bsi['langcod2'] = $this->readHeaderBSI(8);
            }
            $thisfile_ac3_raw_bsi['flags']['audprodinfo2'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['audprodinfo2']) {
                $thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5);
                $thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2);
                $thisfile_ac3['mixing_level2'] = 80 + $thisfile_ac3_raw_bsi['mixlevel2'] . 'dB';
                $thisfile_ac3['room_type2'] = self::roomTypeLookup($thisfile_ac3_raw_bsi['roomtyp2']);
            }
            $thisfile_ac3_raw_bsi['copyright'] = (bool) $this->readHeaderBSI(1);
            $thisfile_ac3_raw_bsi['original'] = (bool) $this->readHeaderBSI(1);
            $thisfile_ac3_raw_bsi['flags']['timecod1'] = $this->readHeaderBSI(2);
            if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x1) {
                $thisfile_ac3_raw_bsi['timecod1'] = $this->readHeaderBSI(14);
                $thisfile_ac3['timecode1'] = 0;
                $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x3e00) >> 9) * 3600;
                $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x1f8) >> 3) * 60;
                $thisfile_ac3['timecode1'] += (($thisfile_ac3_raw_bsi['timecod1'] & 0x3) >> 0) * 8;
            }
            if ($thisfile_ac3_raw_bsi['flags']['timecod1'] & 0x2) {
                $thisfile_ac3_raw_bsi['timecod2'] = $this->readHeaderBSI(14);
                $thisfile_ac3['timecode2'] = 0;
                $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x3800) >> 11) * 1;
                $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x7c0) >> 6) * (1 / 30);
                $thisfile_ac3['timecode2'] += (($thisfile_ac3_raw_bsi['timecod2'] & 0x3f) >> 0) * (1 / 30 / 60);
            }
            $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;
                $this->AC3header['bsi'] .= getid3_lib::BigEndian2Bin($this->fread($thisfile_ac3_raw_bsi['addbsi_length']));
                $thisfile_ac3_raw_bsi['addbsi_data'] = substr($this->AC3header['bsi'], $this->BSIoffset, $thisfile_ac3_raw_bsi['addbsi_length'] * 8);
                $this->BSIoffset += $thisfile_ac3_raw_bsi['addbsi_length'] * 8;
            }
        } elseif ($thisfile_ac3_raw_bsi['bsid'] <= 16) {
            $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_raw_bsi['substreamid'] = $this->readHeaderBSI(3);
            $thisfile_ac3_raw_bsi['frmsiz'] = $this->readHeaderBSI(11);
            $thisfile_ac3_raw_bsi['fscod'] = $this->readHeaderBSI(2);
            if ($thisfile_ac3_raw_bsi['fscod'] == 3) {
                $thisfile_ac3_raw_bsi['fscod2'] = $this->readHeaderBSI(2);
                $thisfile_ac3_raw_bsi['numblkscod'] = 3;
            } else {
                $thisfile_ac3_raw_bsi['numblkscod'] = $this->readHeaderBSI(2);
            }
            $thisfile_ac3['bsi']['blocks_per_sync_frame'] = self::blocksPerSyncFrame($thisfile_ac3_raw_bsi['numblkscod']);
            $thisfile_ac3_raw_bsi['acmod'] = $this->readHeaderBSI(3);
            $thisfile_ac3_raw_bsi['flags']['lfeon'] = (bool) $this->readHeaderBSI(1);
            $thisfile_ac3_raw_bsi['bsid'] = $this->readHeaderBSI(5);
            $thisfile_ac3_raw_bsi['dialnorm'] = $this->readHeaderBSI(5);
            $thisfile_ac3_raw_bsi['flags']['compr'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['compr']) {
                $thisfile_ac3_raw_bsi['compr'] = $this->readHeaderBSI(8);
            }
            if ($thisfile_ac3_raw_bsi['acmod'] == 0) {
                $thisfile_ac3_raw_bsi['dialnorm2'] = $this->readHeaderBSI(5);
                $thisfile_ac3_raw_bsi['flags']['compr2'] = (bool) $this->readHeaderBSI(1);
                if ($thisfile_ac3_raw_bsi['flags']['compr2']) {
                    $thisfile_ac3_raw_bsi['compr2'] = $this->readHeaderBSI(8);
                }
            }
            if ($thisfile_ac3_raw_bsi['strmtyp'] == 1) {
                $thisfile_ac3_raw_bsi['flags']['chanmap'] = (bool) $this->readHeaderBSI(1);
                if ($thisfile_ac3_raw_bsi['flags']['chanmap']) {
                    $thisfile_ac3_raw_bsi['chanmap'] = $this->readHeaderBSI(8);
                }
            }
            $thisfile_ac3_raw_bsi['flags']['mixmdat'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['mixmdat']) {
                if ($thisfile_ac3_raw_bsi['acmod'] > 2) {
                    $thisfile_ac3_raw_bsi['dmixmod'] = $this->readHeaderBSI(2);
                }
                if ($thisfile_ac3_raw_bsi['acmod'] & 0x1 && $thisfile_ac3_raw_bsi['acmod'] > 2) {
                    $thisfile_ac3_raw_bsi['ltrtcmixlev'] = $this->readHeaderBSI(3);
                    $thisfile_ac3_raw_bsi['lorocmixlev'] = $this->readHeaderBSI(3);
                }
                if ($thisfile_ac3_raw_bsi['acmod'] & 0x4) {
                    $thisfile_ac3_raw_bsi['ltrtsurmixlev'] = $this->readHeaderBSI(3);
                    $thisfile_ac3_raw_bsi['lorosurmixlev'] = $this->readHeaderBSI(3);
                }
                if ($thisfile_ac3_raw_bsi['flags']['lfeon']) {
                    $thisfile_ac3_raw_bsi['flags']['lfemixlevcod'] = (bool) $this->readHeaderBSI(1);
                    if ($thisfile_ac3_raw_bsi['flags']['lfemixlevcod']) {
                        $thisfile_ac3_raw_bsi['lfemixlevcod'] = $this->readHeaderBSI(5);
                    }
                }
                if ($thisfile_ac3_raw_bsi['strmtyp'] == 0) {
                    $thisfile_ac3_raw_bsi['flags']['pgmscl'] = (bool) $this->readHeaderBSI(1);
                    if ($thisfile_ac3_raw_bsi['flags']['pgmscl']) {
                        $thisfile_ac3_raw_bsi['pgmscl'] = $this->readHeaderBSI(6);
                    }
                    if ($thisfile_ac3_raw_bsi['acmod'] == 0) {
                        $thisfile_ac3_raw_bsi['flags']['pgmscl2'] = (bool) $this->readHeaderBSI(1);
                        if ($thisfile_ac3_raw_bsi['flags']['pgmscl2']) {
                            $thisfile_ac3_raw_bsi['pgmscl2'] = $this->readHeaderBSI(6);
                        }
                    }
                    $thisfile_ac3_raw_bsi['flags']['extpgmscl'] = (bool) $this->readHeaderBSI(1);
                    if ($thisfile_ac3_raw_bsi['flags']['extpgmscl']) {
                        $thisfile_ac3_raw_bsi['extpgmscl'] = $this->readHeaderBSI(6);
                    }
                    $thisfile_ac3_raw_bsi['mixdef'] = $this->readHeaderBSI(2);
                    if ($thisfile_ac3_raw_bsi['mixdef'] == 1) {
                        $thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1);
                        $thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1);
                        $thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3);
                    } elseif ($thisfile_ac3_raw_bsi['mixdef'] == 2) {
                        $thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI(12);
                    } elseif ($thisfile_ac3_raw_bsi['mixdef'] == 3) {
                        $mixdefbitsread = 0;
                        $thisfile_ac3_raw_bsi['mixdeflen'] = $this->readHeaderBSI(5);
                        $mixdefbitsread += 5;
                        $thisfile_ac3_raw_bsi['flags']['mixdata2'] = (bool) $this->readHeaderBSI(1);
                        $mixdefbitsread += 1;
                        if ($thisfile_ac3_raw_bsi['flags']['mixdata2']) {
                            $thisfile_ac3_raw_bsi['premixcmpsel'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            $thisfile_ac3_raw_bsi['drcsrc'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            $thisfile_ac3_raw_bsi['premixcmpscl'] = $this->readHeaderBSI(3);
                            $mixdefbitsread += 3;
                            $thisfile_ac3_raw_bsi['flags']['extpgmlscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmlscl']) {
                                $thisfile_ac3_raw_bsi['extpgmlscl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['extpgmcscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmcscl']) {
                                $thisfile_ac3_raw_bsi['extpgmcscl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['extpgmrscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmrscl']) {
                                $thisfile_ac3_raw_bsi['extpgmrscl'] = $this->readHeaderBSI(4);
                            }
                            $thisfile_ac3_raw_bsi['flags']['extpgmlsscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmlsscl']) {
                                $thisfile_ac3_raw_bsi['extpgmlsscl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['extpgmrsscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmrsscl']) {
                                $thisfile_ac3_raw_bsi['extpgmrsscl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['extpgmlfescl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['extpgmlfescl']) {
                                $thisfile_ac3_raw_bsi['extpgmlfescl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['dmixscl'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['dmixscl']) {
                                $thisfile_ac3_raw_bsi['dmixscl'] = $this->readHeaderBSI(4);
                                $mixdefbitsread += 4;
                            }
                            $thisfile_ac3_raw_bsi['flags']['addch'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['addch']) {
                                $thisfile_ac3_raw_bsi['flags']['extpgmaux1scl'] = (bool) $this->readHeaderBSI(1);
                                $mixdefbitsread += 1;
                                if ($thisfile_ac3_raw_bsi['flags']['extpgmaux1scl']) {
                                    $thisfile_ac3_raw_bsi['extpgmaux1scl'] = $this->readHeaderBSI(4);
                                    $mixdefbitsread += 4;
                                }
                                $thisfile_ac3_raw_bsi['flags']['extpgmaux2scl'] = (bool) $this->readHeaderBSI(1);
                                $mixdefbitsread += 1;
                                if ($thisfile_ac3_raw_bsi['flags']['extpgmaux2scl']) {
                                    $thisfile_ac3_raw_bsi['extpgmaux2scl'] = $this->readHeaderBSI(4);
                                    $mixdefbitsread += 4;
                                }
                            }
                        }
                        $thisfile_ac3_raw_bsi['flags']['mixdata3'] = (bool) $this->readHeaderBSI(1);
                        $mixdefbitsread += 1;
                        if ($thisfile_ac3_raw_bsi['flags']['mixdata3']) {
                            $thisfile_ac3_raw_bsi['spchdat'] = $this->readHeaderBSI(5);
                            $mixdefbitsread += 5;
                            $thisfile_ac3_raw_bsi['flags']['addspchdat'] = (bool) $this->readHeaderBSI(1);
                            $mixdefbitsread += 1;
                            if ($thisfile_ac3_raw_bsi['flags']['addspchdat']) {
                                $thisfile_ac3_raw_bsi['spchdat1'] = $this->readHeaderBSI(5);
                                $mixdefbitsread += 5;
                                $thisfile_ac3_raw_bsi['spchan1att'] = $this->readHeaderBSI(2);
                                $mixdefbitsread += 2;
                                $thisfile_ac3_raw_bsi['flags']['addspchdat1'] = (bool) $this->readHeaderBSI(1);
                                $mixdefbitsread += 1;
                                if ($thisfile_ac3_raw_bsi['flags']['addspchdat1']) {
                                    $thisfile_ac3_raw_bsi['spchdat2'] = $this->readHeaderBSI(5);
                                    $mixdefbitsread += 5;
                                    $thisfile_ac3_raw_bsi['spchan2att'] = $this->readHeaderBSI(3);
                                    $mixdefbitsread += 3;
                                }
                            }
                        }
                        $mixdata_bits = 8 * ($thisfile_ac3_raw_bsi['mixdeflen'] + 2) - $mixdefbitsread;
                        $mixdata_fill = $mixdata_bits % 8 ? 8 - $mixdata_bits % 8 : 0;
                        $thisfile_ac3_raw_bsi['mixdata'] = $this->readHeaderBSI($mixdata_bits);
                        $thisfile_ac3_raw_bsi['mixdatafill'] = $this->readHeaderBSI($mixdata_fill);
                        unset($mixdefbitsread, $mixdata_bits, $mixdata_fill);
                    }
                    if ($thisfile_ac3_raw_bsi['acmod'] < 2) {
                        $thisfile_ac3_raw_bsi['flags']['paninfo'] = (bool) $this->readHeaderBSI(1);
                        if ($thisfile_ac3_raw_bsi['flags']['paninfo']) {
                            $thisfile_ac3_raw_bsi['panmean'] = $this->readHeaderBSI(8);
                            $thisfile_ac3_raw_bsi['paninfo'] = $this->readHeaderBSI(6);
                        }
                        if ($thisfile_ac3_raw_bsi['acmod'] == 0) {
                            $thisfile_ac3_raw_bsi['flags']['paninfo2'] = (bool) $this->readHeaderBSI(1);
                            if ($thisfile_ac3_raw_bsi['flags']['paninfo2']) {
                                $thisfile_ac3_raw_bsi['panmean2'] = $this->readHeaderBSI(8);
                                $thisfile_ac3_raw_bsi['paninfo2'] = $this->readHeaderBSI(6);
                            }
                        }
                    }
                    $thisfile_ac3_raw_bsi['flags']['frmmixcfginfo'] = (bool) $this->readHeaderBSI(1);
                    if ($thisfile_ac3_raw_bsi['flags']['frmmixcfginfo']) {
                        if ($thisfile_ac3_raw_bsi['numblkscod'] == 0) {
                            $thisfile_ac3_raw_bsi['blkmixcfginfo'][0] = $this->readHeaderBSI(5);
                        } else {
                            for ($blk = 0; $blk < $thisfile_ac3_raw_bsi['numblkscod']; $blk++) {
                                $thisfile_ac3_raw_bsi['flags']['blkmixcfginfo' . $blk] = (bool) $this->readHeaderBSI(1);
                                if ($thisfile_ac3_raw_bsi['flags']['blkmixcfginfo' . $blk]) {
                                    $thisfile_ac3_raw_bsi['blkmixcfginfo'][$blk] = $this->readHeaderBSI(5);
                                }
                            }
                        }
                    }
                }
            }
            $thisfile_ac3_raw_bsi['flags']['infomdat'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['infomdat']) {
                $thisfile_ac3_raw_bsi['bsmod'] = $this->readHeaderBSI(3);
                $thisfile_ac3_raw_bsi['flags']['copyrightb'] = (bool) $this->readHeaderBSI(1);
                $thisfile_ac3_raw_bsi['flags']['origbs'] = (bool) $this->readHeaderBSI(1);
                if ($thisfile_ac3_raw_bsi['acmod'] == 2) {
                    $thisfile_ac3_raw_bsi['dsurmod'] = $this->readHeaderBSI(2);
                    $thisfile_ac3_raw_bsi['dheadphonmod'] = $this->readHeaderBSI(2);
                }
                if ($thisfile_ac3_raw_bsi['acmod'] >= 6) {
                    $thisfile_ac3_raw_bsi['dsurexmod'] = $this->readHeaderBSI(2);
                }
                $thisfile_ac3_raw_bsi['flags']['audprodi'] = (bool) $this->readHeaderBSI(1);
                if ($thisfile_ac3_raw_bsi['flags']['audprodi']) {
                    $thisfile_ac3_raw_bsi['mixlevel'] = $this->readHeaderBSI(5);
                    $thisfile_ac3_raw_bsi['roomtyp'] = $this->readHeaderBSI(2);
                    $thisfile_ac3_raw_bsi['flags']['adconvtyp'] = (bool) $this->readHeaderBSI(1);
                }
                if ($thisfile_ac3_raw_bsi['acmod'] == 0) {
                    $thisfile_ac3_raw_bsi['flags']['audprodi2'] = (bool) $this->readHeaderBSI(1);
                    if ($thisfile_ac3_raw_bsi['flags']['audprodi2']) {
                        $thisfile_ac3_raw_bsi['mixlevel2'] = $this->readHeaderBSI(5);
                        $thisfile_ac3_raw_bsi['roomtyp2'] = $this->readHeaderBSI(2);
                        $thisfile_ac3_raw_bsi['flags']['adconvtyp2'] = (bool) $this->readHeaderBSI(1);
                    }
                }
                if ($thisfile_ac3_raw_bsi['fscod'] < 3) {
                    $thisfile_ac3_raw_bsi['flags']['sourcefscod'] = (bool) $this->readHeaderBSI(1);
                }
            }
            if ($thisfile_ac3_raw_bsi['strmtyp'] == 0 && $thisfile_ac3_raw_bsi['numblkscod'] != 3) {
                $thisfile_ac3_raw_bsi['flags']['convsync'] = (bool) $this->readHeaderBSI(1);
            }
            if ($thisfile_ac3_raw_bsi['strmtyp'] == 2) {
                if ($thisfile_ac3_raw_bsi['numblkscod'] != 3) {
                    $thisfile_ac3_raw_bsi['flags']['blkid'] = 1;
                } else {
                    $thisfile_ac3_raw_bsi['flags']['blkid'] = (bool) $this->readHeaderBSI(1);
                }
                if ($thisfile_ac3_raw_bsi['flags']['blkid']) {
                    $thisfile_ac3_raw_bsi['frmsizecod'] = $this->readHeaderBSI(6);
                }
            }
            $thisfile_ac3_raw_bsi['flags']['addbsi'] = (bool) $this->readHeaderBSI(1);
            if ($thisfile_ac3_raw_bsi['flags']['addbsi']) {
                $thisfile_ac3_raw_bsi['addbsil'] = $this->readHeaderBSI(6);
                $thisfile_ac3_raw_bsi['addbsi'] = $this->readHeaderBSI(($thisfile_ac3_raw_bsi['addbsil'] + 1) * 8);
            }
        } else {
            $this->error('Bit stream identification is version ' . $thisfile_ac3_raw_bsi['bsid'] . ', but getID3() only understands up to version 16. Please submit a support ticket with a sample file.');
            unset($info['ac3']);
            return false;
        }
        if (isset($thisfile_ac3_raw_bsi['fscod2'])) {
            $thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup2($thisfile_ac3_raw_bsi['fscod2']);
        } else {
            $thisfile_ac3['sample_rate'] = self::sampleRateCodeLookup($thisfile_ac3_raw_bsi['fscod']);
        }
        if ($thisfile_ac3_raw_bsi['fscod'] <= 3) {
            $info['audio']['sample_rate'] = $thisfile_ac3['sample_rate'];
        } else {
            $this->warning('Unexpected ac3.bsi.fscod value: ' . $thisfile_ac3_raw_bsi['fscod']);
        }
        if (isset($thisfile_ac3_raw_bsi['frmsizecod'])) {
            $thisfile_ac3['frame_length'] = self::frameSizeLookup($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'])) {
            $thisfile_ac3['bitrate'] = ($thisfile_ac3_raw_bsi['frmsiz'] + 1) * 16 * 30;
            $thisfile_ac3['bitrate'] = round($thisfile_ac3['bitrate'] * 1.05 / 16000) * 16000;
        }
        $info['audio']['bitrate'] = $thisfile_ac3['bitrate'];
        if (isset($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] = $value;
        }
        switch ($thisfile_ac3_raw_bsi['acmod']) {
            case 0:
            case 1:
                $info['audio']['channelmode'] = 'mono';
                break;
            case 3:
            case 4:
                $info['audio']['channelmode'] = 'stereo';
                break;
            default:
                $info['audio']['channelmode'] = 'surround';
                break;
        }
        $info['audio']['channels'] = $thisfile_ac3['num_channels'];
        $thisfile_ac3['lfe_enabled'] = $thisfile_ac3_raw_bsi['flags']['lfeon'];
        if ($thisfile_ac3_raw_bsi['flags']['lfeon']) {
            $info['audio']['channels'] .= '.1';
        }
        $thisfile_ac3['channels_enabled'] = self::channelsEnabledLookup($thisfile_ac3_raw_bsi['acmod'], $thisfile_ac3_raw_bsi['flags']['lfeon']);
        $thisfile_ac3['dialogue_normalization'] = '-' . $thisfile_ac3_raw_bsi['dialnorm'] . 'dB';
        return true;
    }
    private function readHeaderBSI($length)
    {
        $data = substr($this->AC3header['bsi'], $this->BSIoffset, $length);
        $this->BSIoffset += $length;
        return bindec($data);
    }
    public static function sampleRateCodeLookup($fscod)
    {
        static $sampleRateCodeLookup = array(0 => 48000, 1 => 44100, 2 => 32000, 3 => 'reserved');
        return isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false;
    }
    public static function sampleRateCodeLookup2($fscod2)
    {
        static $sampleRateCodeLookup2 = array(0 => 24000, 1 => 22050, 2 => 16000, 3 => 'reserved');
        return isset($sampleRateCodeLookup2[$fscod2]) ? $sampleRateCodeLookup2[$fscod2] : false;
    }
    public static function serviceTypeLookup($bsmod, $acmod)
    {
        static $serviceTypeLookup = array();
        if (empty($serviceTypeLookup)) {
            for ($i = 0; $i <= 7; $i++) {
                $serviceTypeLookup[0][$i] = 'main audio service: complete main (CM)';
                $serviceTypeLookup[1][$i] = 'main audio service: music and effects (ME)';
                $serviceTypeLookup[2][$i] = 'associated service: visually impaired (VI)';
                $serviceTypeLookup[3][$i] = 'associated service: hearing impaired (HI)';
                $serviceTypeLookup[4][$i] = 'associated service: dialogue (D)';
                $serviceTypeLookup[5][$i] = 'associated service: commentary (C)';
                $serviceTypeLookup[6][$i] = 'associated service: emergency (E)';
            }
            $serviceTypeLookup[7][1] = 'associated service: voice over (VO)';
            for ($i = 2; $i <= 7; $i++) {
                $serviceTypeLookup[7][$i] = 'main audio service: karaoke';
            }
        }
        return isset($serviceTypeLookup[$bsmod][$acmod]) ? $serviceTypeLookup[$bsmod][$acmod] : false;
    }
    public static function audioCodingModeLookup($acmod)
    {
        static $audioCodingModeLookup = array(0 => array('channel_config' => '1+1', 'num_channels' => 2, 'channel_order' => 'Ch1,Ch2'), 1 => array('channel_config' => '1/0', 'num_channels' => 1, 'channel_order' => 'C'), 2 => array('channel_config' => '2/0', 'num_channels' => 2, 'channel_order' => 'L,R'), 3 => array('channel_config' => '3/0', 'num_channels' => 3, 'channel_order' => 'L,C,R'), 4 => array('channel_config' => '2/1', 'num_channels' => 3, 'channel_order' => 'L,R,S'), 5 => array('channel_config' => '3/1', 'num_channels' => 4, 'channel_order' => 'L,C,R,S'), 6 => array('channel_config' => '2/2', 'num_channels' => 4, 'channel_order' => 'L,R,SL,SR'), 7 => array('channel_config' => '3/2', 'num_channels' => 5, 'channel_order' => 'L,C,R,SL,SR'));
        return isset($audioCodingModeLookup[$acmod]) ? $audioCodingModeLookup[$acmod] : false;
    }
    public static function centerMixLevelLookup($cmixlev)
    {
        static $centerMixLevelLookup;
        if (empty($centerMixLevelLookup)) {
            $centerMixLevelLookup = array(0 => pow(2, -3.0 / 6), 1 => pow(2, -4.5 / 6), 2 => pow(2, -6.0 / 6), 3 => 'reserved');
        }
        return isset($centerMixLevelLookup[$cmixlev]) ? $centerMixLevelLookup[$cmixlev] : false;
    }
    public static function surroundMixLevelLookup($surmixlev)
    {
        static $surroundMixLevelLookup;
        if (empty($surroundMixLevelLookup)) {
            $surroundMixLevelLookup = array(0 => pow(2, -3.0 / 6), 1 => pow(2, -6.0 / 6), 2 => 0, 3 => 'reserved');
        }
        return isset($surroundMixLevelLookup[$surmixlev]) ? $surroundMixLevelLookup[$surmixlev] : false;
    }
    public static function dolbySurroundModeLookup($dsurmod)
    {
        static $dolbySurroundModeLookup = array(0 => 'not indicated', 1 => 'Not Dolby Surround encoded', 2 => 'Dolby Surround encoded', 3 => 'reserved');
        return isset($dolbySurroundModeLookup[$dsurmod]) ? $dolbySurroundModeLookup[$dsurmod] : false;
    }
    public static function channelsEnabledLookup($acmod, $lfeon)
    {
        $lookup = array('ch1' => $acmod == 0, 'ch2' => $acmod == 0, 'left' => $acmod > 1, 'right' => $acmod > 1, 'center' => (bool) ($acmod & 0x1), 'surround_mono' => false, 'surround_left' => false, 'surround_right' => false, 'lfe' => $lfeon);
        switch ($acmod) {
            case 4:
            case 5:
                $lookup['surround_mono'] = true;
                break;
            case 6:
            case 7:
                $lookup['surround_left'] = true;
                $lookup['surround_right'] = true;
                break;
        }
        return $lookup;
    }
    public static function heavyCompression($compre)
    {
        $fourbit = str_pad(decbin(($compre & 0xf0) >> 4), 4, '0', STR_PAD_LEFT);
        if ($fourbit[0] == '1') {
            $log_gain = -8 + bindec(substr($fourbit, 1));
        } else {
            $log_gain = bindec(substr($fourbit, 1));
        }
        $log_gain = ($log_gain + 1) * getid3_lib::RGADamplitude2dB(2);
        $lin_gain = (16 + ($compre & 0xf)) / 32;
        return $log_gain - $lin_gain;
    }
    public static function roomTypeLookup($roomtyp)
    {
        static $roomTypeLookup = array(0 => 'not indicated', 1 => 'large room, X curve monitor', 2 => 'small room, flat monitor', 3 => 'reserved');
        return isset($roomTypeLookup[$roomtyp]) ? $roomTypeLookup[$roomtyp] : false;
    }
    public static function frameSizeLookup($frmsizecod, $fscod)
    {
        $padding = (bool) ($frmsizecod & 0x1);
        $framesizeid = ($frmsizecod & 0x3e) >> 1;
        static $frameSizeLookup = array();
        if (empty($frameSizeLookup)) {
            $frameSizeLookup = array(0 => array(128, 138, 192), 1 => array(160, 174, 240), 2 => array(192, 208, 288), 3 => array(224, 242, 336), 4 => array(256, 278, 384), 5 => array(320, 348, 480), 6 => array(384, 416, 576), 7 => array(448, 486, 672), 8 => array(512, 556, 768), 9 => array(640, 696, 960), 10 => array(768, 834, 1152), 11 => array(896, 974, 1344), 12 => array(1024, 1114, 1536), 13 => array(1280, 1392, 1920), 14 => array(1536, 1670, 2304), 15 => array(1792, 1950, 2688), 16 => array(2048, 2228, 3072), 17 => array(2304, 2506, 3456), 18 => array(2560, 2786, 3840));
        }
        $paddingBytes = 0;
        if ($fscod == 1 && $padding) {
            $paddingBytes = 2;
        }
        return isset($frameSizeLookup[$framesizeid][$fscod]) ? $frameSizeLookup[$framesizeid][$fscod] + $paddingBytes : false;
    }
    public static function bitrateLookup($frmsizecod)
    {
        $padding = (bool) ($frmsizecod & 0x1);
        $framesizeid = ($frmsizecod & 0x3e) >> 1;
        static $bitrateLookup = array(0 => 32000, 1 => 40000, 2 => 48000, 3 => 56000, 4 => 64000, 5 => 80000, 6 => 96000, 7 => 112000, 8 => 128000, 9 => 160000, 10 => 192000, 11 => 224000, 12 => 256000, 13 => 320000, 14 => 384000, 15 => 448000, 16 => 512000, 17 => 576000, 18 => 640000);
        return isset($bitrateLookup[$framesizeid]) ? $bitrateLookup[$framesizeid] : false;
    }
    public static function blocksPerSyncFrame($numblkscod)
    {
        static $blocksPerSyncFrameLookup = array(0 => 1, 1 => 2, 2 => 3, 3 => 6);
        return isset($blocksPerSyncFrameLookup[$numblkscod]) ? $blocksPerSyncFrameLookup[$numblkscod] : false;
    }
}