getid3_mp3 Class Reference
Collaboration diagram for getid3_mp3:
Public Member Functions | |
| getid3_mp3 (&$fd, &$ThisFileInfo) | |
| GuessEncoderOptions (&$ThisFileInfo) | |
| decodeMPEGaudioHeader ($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) | |
| RecursiveFrameScanning (&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR) | |
| FreeFormatFrameLength ($fd, $offset, &$ThisFileInfo, $deepscan=false) | |
| getOnlyMPEGaudioInfoBruteForce ($fd, &$ThisFileInfo) | |
| getOnlyMPEGaudioInfo ($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false) | |
| MPEGaudioVersionArray () | |
| MPEGaudioLayerArray () | |
| MPEGaudioBitrateArray () | |
| MPEGaudioFrequencyArray () | |
| MPEGaudioChannelModeArray () | |
| MPEGaudioModeExtensionArray () | |
| MPEGaudioEmphasisArray () | |
| MPEGaudioHeaderBytesValid ($head4, $allowBitrate15=false) | |
| MPEGaudioHeaderValid ($rawarray, $echoerrors=false, $allowBitrate15=false) | |
| MPEGaudioHeaderDecode ($Header4Bytes) | |
| MPEGaudioFrameLength (&$bitrate, &$version, &$layer, $padding, &$samplerate) | |
| ClosestStandardMP3Bitrate ($bitrate) | |
| XingVBRidOffset ($version, $channelmode) | |
| LAMEvbrMethodLookup ($VBRmethodID) | |
| LAMEmiscStereoModeLookup ($StereoModeID) | |
| LAMEmiscSourceSampleFrequencyLookup ($SourceSampleFrequencyID) | |
| LAMEsurroundInfoLookup ($SurroundInfoID) | |
| LAMEpresetUsedLookup ($LAMEtag) | |
Data Fields | |
| $allow_bruteforce = false | |
Detailed Description
Definition at line 24 of file module.audio.mp3.php.
Member Function Documentation
◆ ClosestStandardMP3Bitrate()
| getid3_mp3::ClosestStandardMP3Bitrate | ( | $bitrate | ) |
Definition at line 1785 of file module.audio.mp3.php.
1785 {
1786 static $StandardBitrates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1787 static $BitrateTable = array(0=>'-');
1788 $roundbitrate = intval(round($bitrate, -3));
1789 if (!isset($BitrateTable[$roundbitrate])) {
1790 if ($roundbitrate > 320000) {
1791 $BitrateTable[$roundbitrate] = round($bitrate, -4);
1792 } else {
1793 $LastBitrate = 320000;
1794 foreach ($StandardBitrates as $StandardBitrate) {
1795 $BitrateTable[$roundbitrate] = $StandardBitrate;
1796 if ($roundbitrate >= $StandardBitrate - (($LastBitrate - $StandardBitrate) / 2)) {
1797 break;
1798 }
1799 $LastBitrate = $StandardBitrate;
1800 }
1801 }
1802 }
1803 return $BitrateTable[$roundbitrate];
1804 }
Referenced by decodeMPEGaudioHeader().
Here is the caller graph for this function:
◆ decodeMPEGaudioHeader()
| getid3_mp3::decodeMPEGaudioHeader | ( | $fd, | |
| $offset, | |||
| & | $ThisFileInfo, | ||
$recursivesearch = true, |
|||
$ScanAsCBR = false, |
|||
$FastMPEGheaderScan = false |
|||
| ) |
Definition at line 401 of file module.audio.mp3.php.
401 {
402
403 static $MPEGaudioVersionLookup;
404 static $MPEGaudioLayerLookup;
405 static $MPEGaudioBitrateLookup;
406 static $MPEGaudioFrequencyLookup;
407 static $MPEGaudioChannelModeLookup;
408 static $MPEGaudioModeExtensionLookup;
409 static $MPEGaudioEmphasisLookup;
410 if (empty($MPEGaudioVersionLookup)) {
411 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
412 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
413 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
414 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
415 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
416 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
417 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
418 }
419
420 if ($offset >= $ThisFileInfo['avdataend']) {
421 $ThisFileInfo['error'][] = 'end of file encounter looking for MPEG synch';
422 return false;
423 }
424 fseek($fd, $offset, SEEK_SET);
425 //$headerstring = fread($fd, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
426 $headerstring = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
427
428 // MP3 audio frame structure:
429 // $aa $aa $aa $aa [$bb $bb] $cc...
430 // where $aa..$aa is the four-byte mpeg-audio header (below)
431 // $bb $bb is the optional 2-byte CRC
432 // and $cc... is the audio data
433
434 $head4 = substr($headerstring, 0, 4);
435
436 static $MPEGaudioHeaderDecodeCache = array();
437 if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
438 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
439 } else {
440 $MPEGheaderRawArray = getid3_mp3::MPEGaudioHeaderDecode($head4);
441 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
442 }
443
444 static $MPEGaudioHeaderValidCache = array();
445
446 // Not in cache
447 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
448 //$MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
449 $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
450 }
451
452 // shortcut
453 if (!isset($ThisFileInfo['mpeg']['audio'])) {
454 $ThisFileInfo['mpeg']['audio'] = array();
455 }
456 $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
457
458
459 if ($MPEGaudioHeaderValidCache[$head4]) {
460 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
461 } else {
462 $ThisFileInfo['error'][] = 'Invalid MPEG audio header at offset '.$offset;
463 return false;
464 }
465
466 if (!$FastMPEGheaderScan) {
467
468 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
469 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
470
471 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
472 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
473 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
474 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
475 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
476 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
477 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
478 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
479 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
480
481 $ThisFileInfo['audio']['channels'] = $thisfile_mpeg_audio['channels'];
482 $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
483
484 if ($thisfile_mpeg_audio['protection']) {
486 }
487
488 }
489
490 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
491 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
492 $ThisFileInfo['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
493 $thisfile_mpeg_audio['raw']['bitrate'] = 0;
494 }
495 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
496 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
497
498 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $ThisFileInfo['avdataoffset'])) {
499 // only skip multiple frame check if free-format bitstream found at beginning of file
500 // otherwise is quite possibly simply corrupted data
501 $recursivesearch = false;
502 }
503
504 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
505 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
506
507 $ThisFileInfo['audio']['dataformat'] = 'mp2';
508 switch ($thisfile_mpeg_audio['channelmode']) {
509
510 case 'mono':
511 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
512 // these are ok
513 } else {
514 $ThisFileInfo['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
515 return false;
516 }
517 break;
518
519 case 'stereo':
520 case 'joint stereo':
521 case 'dual channel':
522 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
523 // these are ok
524 } else {
525 $ThisFileInfo['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.';
526 return false;
527 }
528 break;
529
530 }
531
532 }
533
534
535 if ($ThisFileInfo['audio']['sample_rate'] > 0) {
536 $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $ThisFileInfo['audio']['sample_rate']);
537 }
538
539 $nextframetestoffset = $offset + 1;
540 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
541
542 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
543
544 if (isset($thisfile_mpeg_audio['framelength'])) {
545 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
546 } else {
547 $ThisFileInfo['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.';
548 return false;
549 }
550
551 }
552
553 $ExpectedNumberOfAudioBytes = 0;
554
556 // Variable-bitrate headers
557
558 if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
559 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
560 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
561
562 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
563 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
564 $ThisFileInfo['audio']['codec'] = 'Fraunhofer';
565
566 $SideInfoData = substr($headerstring, 4 + 2, 32);
567
568 $FraunhoferVBROffset = 36;
569
570 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion
571 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay
572 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality
573 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
574 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
575 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
576 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
577 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
578 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames
579
580 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
581
582 $previousbyteoffset = $offset;
583 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
584 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
585 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
586 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
587 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
588 $previousbyteoffset += $Fraunhofer_OffsetN;
589 }
590
591
592 } else {
593
594 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
595 // depending on MPEG layer and number of channels
596
597 $VBRidOffset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
598 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
599
600 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
601 // 'Xing' is traditional Xing VBR frame
602 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
603 // 'Info' *can* legally be used to specify a VBR file as well, however.
604
605 // http://www.multiweb.cz/twoinches/MP3inside.htm
606 //00..03 = "Xing" or "Info"
607 //04..07 = Flags:
608 // 0x01 Frames Flag set if value for number of frames in file is stored
609 // 0x02 Bytes Flag set if value for filesize in bytes is stored
610 // 0x04 TOC Flag set if values for TOC are stored
611 // 0x08 VBR Scale Flag set if values for VBR scale is stored
612 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
613 //12..15 Bytes: File length in Bytes
614 //16..115 TOC (Table of Contents):
615 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
616 // Each Byte has a value according this formula:
617 // (TOC[i] / 256) * fileLenInBytes
618 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
619 // TOC[(60/240)*100] = TOC[25]
620 // and corresponding Byte in file is then approximately at:
621 // (TOC[25]/256) * 5000000
622 //116..119 VBR Scale
623
624
625 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
626// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
627 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
628 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
629// } else {
630// $ScanAsCBR = true;
631// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
632// }
633
634 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));
635
636 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
637 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
638 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
639 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
640
641 if ($thisfile_mpeg_audio['xing_flags']['frames']) {
642 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4));
643 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
644 }
645 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
646 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
647 }
648
649 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
650 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
651
652 $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
653
654 if ($thisfile_mpeg_audio['layer'] == '1') {
655 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
656 //$ThisFileInfo['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
657 $ThisFileInfo['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 12;
658 } else {
659 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
660 //$ThisFileInfo['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
661 $ThisFileInfo['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $ThisFileInfo['audio']['channels']) / 144;
662 }
663 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
664 }
665
666 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
667 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
668 for ($i = 0; $i < 100; $i++) {
669 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
670 }
671 }
672 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
673 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
674 }
675
676
677 // http://gabriel.mp3-tech.org/mp3infotag.html
678 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
679
680 // shortcut
681 $thisfile_mpeg_audio['LAME'] = array();
682 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
683
684
685 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
686 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
687
688 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
689
690 // extra 11 chars are not part of version string when LAMEtag present
691 unset($thisfile_mpeg_audio_lame['long_version']);
692
693 // It the LAME tag was only introduced in LAME v3.90
694 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
695
696 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
697 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
698 // MPEG-1 non-mono, but not for other combinations
699 $LAMEtagOffsetContant = $VBRidOffset - 0x24;
700
701 // shortcuts
702 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
703 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
704 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
705 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
706 $thisfile_mpeg_audio_lame['raw'] = array();
707 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
708
709 // byte $9B VBR Quality
710 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
711 // Actually overwrites original Xing bytes
712 unset($thisfile_mpeg_audio['VBR_scale']);
713 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
714
715 // bytes $9C-$A4 Encoder short VersionString
716 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
717
718 // byte $A5 Info Tag revision + VBR method
719 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
720
721 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
722 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
723 $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
724 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
725
726 // byte $A6 Lowpass filter value
727 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
728
729 // bytes $A7-$AE Replay Gain
730 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
731 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
732 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
733 // LAME 3.94a16 and later - 9.23 fixed point
734 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
735 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
736 } else {
737 // LAME 3.94a15 and earlier - 32-bit floating point
738 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
739 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
740 }
741 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
742 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
743 } else {
744 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
745 }
746
747 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
748 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
749
750
751 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
752
753 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
754 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
755 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
756 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
757 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
758 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
759 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
760
761 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
762 $ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
763 }
764 $ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
765 $ThisFileInfo['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
766 } else {
767 unset($thisfile_mpeg_audio_lame_RGAD['track']);
768 }
769 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
770
771 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
772 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
773 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
774 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
775 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
776 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
777 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
778
779 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
780 $ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
781 }
782 $ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
783 $ThisFileInfo['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
784 } else {
785 unset($thisfile_mpeg_audio_lame_RGAD['album']);
786 }
787 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
788 unset($thisfile_mpeg_audio_lame['RGAD']);
789 }
790
791
792 // byte $AF Encoding flags + ATH Type
793 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
794 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
795 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
796 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
797 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
798 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
799
800 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
801 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
802 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
803 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
804 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
805 // ignore
806 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
807 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
808 }
809
810 // bytes $B1-$B3 Encoder delays
811 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
812 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
813 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
814
815 // byte $B4 Misc
816 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
817 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
818 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
819 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
820 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
821 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
822 $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
823 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
824 $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
825
826 // byte $B5 MP3 Gain
827 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
828 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
829 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
830
831 // bytes $B6-$B7 Preset and surround info
832 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
833 // Reserved = ($PresetSurroundBytes & 0xC000);
834 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
835 $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
836 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
837 $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
838 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
839 $ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org';
840 }
841 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
842 // this may change if 3.90.4 ever comes out
843 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
844 }
845
846 // bytes $B8-$BB MusicLength
847 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
848 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
849
850 // bytes $BC-$BD MusicCRC
851 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
852
853 // bytes $BE-$BF CRC-16 of Info Tag
854 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
855
856
857 // LAME CBR
858 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
859
860 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
861 $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
862 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
863 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
864 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
865 //}
866
867 }
868
869 }
870 }
871
872 } else {
873
874 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
875 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
876 if ($recursivesearch) {
877 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
878 if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) {
879 $recursivesearch = false;
880 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
881 }
882 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
883 $ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
884 }
885 }
886
887 }
888
889 }
890
891 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']))) {
892 if ($ExpectedNumberOfAudioBytes > ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) {
893 if (($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])) == 1) {
894 $ThisFileInfo['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
895 } else {
896 $ThisFileInfo['warning'][] = 'Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'])).' bytes)';
897 }
898 } else {
899 if ((($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
900 // $prenullbytefileoffset = ftell($fd);
901 // fseek($fd, $ThisFileInfo['avdataend'], SEEK_SET);
902 // $PossibleNullByte = fread($fd, 1);
903 // fseek($fd, $prenullbytefileoffset, SEEK_SET);
904 // if ($PossibleNullByte === "\x00") {
905 $ThisFileInfo['avdataend']--;
906 // $ThisFileInfo['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
907 // } else {
908 // $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
909 // }
910 } else {
911 $ThisFileInfo['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']).' ('.(($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
912 }
913 }
914 }
915
916 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) {
917 if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
919 if ($framebytelength > 0) {
920 $thisfile_mpeg_audio['framelength'] = $framebytelength;
921 if ($thisfile_mpeg_audio['layer'] == '1') {
922 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
923 $ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
924 } else {
925 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
926 $ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
927 }
928 } else {
929 $ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
930 }
931 }
932 }
933
934 if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
935 switch ($thisfile_mpeg_audio['bitrate_mode']) {
936 case 'vbr':
937 case 'abr':
938 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
939 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384);
940 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
941 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576);
942 } else {
943 $thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152);
944 }
945 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
946 $ThisFileInfo['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
947 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
948 }
949 break;
950 }
951 }
952
953 // End variable-bitrate headers
955
956 if ($recursivesearch) {
957
958 if (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, $ScanAsCBR)) {
959 return false;
960 }
961
962 }
963
964
965 //if (false) {
966 // // experimental side info parsing section - not returning anything useful yet
967 //
968 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
969 // $SideInfoOffset = 0;
970 //
971 // if ($thisfile_mpeg_audio['version'] == '1') {
972 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
973 // // MPEG-1 (mono)
974 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
975 // $SideInfoOffset += 9;
976 // $SideInfoOffset += 5;
977 // } else {
978 // // MPEG-1 (stereo, joint-stereo, dual-channel)
979 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
980 // $SideInfoOffset += 9;
981 // $SideInfoOffset += 3;
982 // }
983 // } else { // 2 or 2.5
984 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
985 // // MPEG-2, MPEG-2.5 (mono)
986 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
987 // $SideInfoOffset += 8;
988 // $SideInfoOffset += 1;
989 // } else {
990 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
991 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
992 // $SideInfoOffset += 8;
993 // $SideInfoOffset += 2;
994 // }
995 // }
996 //
997 // if ($thisfile_mpeg_audio['version'] == '1') {
998 // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) {
999 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1000 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1001 // $SideInfoOffset += 2;
1002 // }
1003 // }
1004 // }
1005 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1006 // for ($channel = 0; $channel < $ThisFileInfo['audio']['channels']; $channel++) {
1007 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1008 // $SideInfoOffset += 12;
1009 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1010 // $SideInfoOffset += 9;
1011 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1012 // $SideInfoOffset += 8;
1013 // if ($thisfile_mpeg_audio['version'] == '1') {
1014 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1015 // $SideInfoOffset += 4;
1016 // } else {
1017 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1018 // $SideInfoOffset += 9;
1019 // }
1020 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1021 // $SideInfoOffset += 1;
1022 //
1023 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1024 //
1025 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1026 // $SideInfoOffset += 2;
1027 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1028 // $SideInfoOffset += 1;
1029 //
1030 // for ($region = 0; $region < 2; $region++) {
1031 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1032 // $SideInfoOffset += 5;
1033 // }
1034 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1035 //
1036 // for ($window = 0; $window < 3; $window++) {
1037 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1038 // $SideInfoOffset += 3;
1039 // }
1040 //
1041 // } else {
1042 //
1043 // for ($region = 0; $region < 3; $region++) {
1044 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1045 // $SideInfoOffset += 5;
1046 // }
1047 //
1048 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1049 // $SideInfoOffset += 4;
1050 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1051 // $SideInfoOffset += 3;
1052 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1053 // }
1054 //
1055 // if ($thisfile_mpeg_audio['version'] == '1') {
1056 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1057 // $SideInfoOffset += 1;
1058 // }
1059 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1060 // $SideInfoOffset += 1;
1061 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1062 // $SideInfoOffset += 1;
1063 // }
1064 // }
1065 //}
1066
1067 return true;
1068 }
RGADadjustmentLookup($rawadjustment, $signbit)
Definition: getid3.lib.php:1141
BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:234
MPEGaudioHeaderDecode($Header4Bytes)
Definition: module.audio.mp3.php:1687
LAMEvbrMethodLookup($VBRmethodID)
Definition: module.audio.mp3.php:1832
ClosestStandardMP3Bitrate($bitrate)
Definition: module.audio.mp3.php:1785
LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID)
Definition: module.audio.mp3.php:1862
FreeFormatFrameLength($fd, $offset, &$ThisFileInfo, $deepscan=false)
Definition: module.audio.mp3.php:1108
MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false)
Definition: module.audio.mp3.php:1615
MPEGaudioModeExtensionArray()
Definition: module.audio.mp3.php:1594
LAMEmiscStereoModeLookup($StereoModeID)
Definition: module.audio.mp3.php:1848
LAMEsurroundInfoLookup($SurroundInfoID)
Definition: module.audio.mp3.php:1872
MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate)
Definition: module.audio.mp3.php:1724
RecursiveFrameScanning(&$fd, &$ThisFileInfo, &$offset, &$nextframetestoffset, $ScanAsCBR)
Definition: module.audio.mp3.php:1070
MPEGaudioChannelModeArray()
Definition: module.audio.mp3.php:1589
XingVBRidOffset($version, $channelmode)
Definition: module.audio.mp3.php:1806
References getid3_lib\BigEndian2Int(), ClosestStandardMP3Bitrate(), FreeFormatFrameLength(), LAMEmiscSourceSampleFrequencyLookup(), LAMEmiscStereoModeLookup(), LAMEpresetUsedLookup(), LAMEsurroundInfoLookup(), LAMEvbrMethodLookup(), getid3_lib\LittleEndian2Float(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), MPEGaudioVersionArray(), RecursiveFrameScanning(), getid3_lib\RGADadjustmentLookup(), getid3_lib\RGADamplitude2dB(), getid3_lib\RGADnameLookup(), getid3_lib\RGADoriginatorLookup(), and XingVBRidOffset().
Referenced by getid3_mpeg\getid3_mpeg(), getOnlyMPEGaudioInfo(), and RecursiveFrameScanning().
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◆ FreeFormatFrameLength()
| getid3_mp3::FreeFormatFrameLength | ( | $fd, | |
| $offset, | |||
| & | $ThisFileInfo, | ||
$deepscan = false |
|||
| ) |
Definition at line 1108 of file module.audio.mp3.php.
1108 {
1109 fseek($fd, $offset, SEEK_SET);
1110 $MPEGaudioData = fread($fd, 32768);
1111
1112 $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1113 // may be different pattern due to padding
1114 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
1115 if ($SyncPattern2 === $SyncPattern1) {
1116 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
1117 }
1118
1119 $framelength = false;
1120 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1121 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1122 if ($framelength1 > 4) {
1123 $framelength = $framelength1;
1124 }
1125 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1126 $framelength = $framelength2;
1127 }
1128 if (!$framelength) {
1129
1130 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1131 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1132 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1133
1134 if ($framelength1 > 4) {
1135 $framelength = $framelength1;
1136 }
1137 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1138 $framelength = $framelength2;
1139 }
1140 if (!$framelength) {
1141 $ThisFileInfo['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset;
1142 return false;
1143 } else {
1144 $ThisFileInfo['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
1145 $ThisFileInfo['audio']['codec'] = 'LAME';
1146 $ThisFileInfo['audio']['encoder'] = 'LAME3.88';
1147 $SyncPattern1 = substr($SyncPattern1, 0, 3);
1148 $SyncPattern2 = substr($SyncPattern2, 0, 3);
1149 }
1150 }
1151
1152 if ($deepscan) {
1153
1154 $ActualFrameLengthValues = array();
1155 $nextoffset = $offset + $framelength;
1156 while ($nextoffset < ($ThisFileInfo['avdataend'] - 6)) {
1157 fseek($fd, $nextoffset - 1, SEEK_SET);
1158 $NextSyncPattern = fread($fd, 6);
1159 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1160 // good - found where expected
1161 $ActualFrameLengthValues[] = $framelength;
1162 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1163 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1164 $ActualFrameLengthValues[] = ($framelength - 1);
1165 $nextoffset--;
1166 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1167 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1168 $ActualFrameLengthValues[] = ($framelength + 1);
1169 $nextoffset++;
1170 } else {
1171 $ThisFileInfo['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset;
1172 return false;
1173 }
1174 $nextoffset += $framelength;
1175 }
1176 if (count($ActualFrameLengthValues) > 0) {
1177 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1178 }
1179 }
1180 return $framelength;
1181 }
PrintHexBytes($string, $hex=true, $spaces=true, $htmlsafe=true)
Definition: getid3.lib.php:17
References getid3_lib\PrintHexBytes().
Referenced by decodeMPEGaudioHeader().
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◆ getid3_mp3()
| getid3_mp3::getid3_mp3 | ( | & | $fd, |
| & | $ThisFileInfo | ||
| ) |
Definition at line 29 of file module.audio.mp3.php.
29 {
30
32 if ($this->allow_bruteforce) {
33 $ThisFileInfo['error'][] = 'Rescanning file in BruteForce mode';
34 $this->getOnlyMPEGaudioInfoBruteForce($fd, $ThisFileInfo);
35 }
36 }
37
38
39 if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode'])) {
40 $ThisFileInfo['audio']['bitrate_mode'] = strtolower($ThisFileInfo['mpeg']['audio']['bitrate_mode']);
41 }
42
43 if (((isset($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] > $ThisFileInfo['id3v2']['headerlength'])) || (!isset($ThisFileInfo['id3v2']) && ($ThisFileInfo['avdataoffset'] > 0)))) {
44
45 $synchoffsetwarning = 'Unknown data before synch ';
46 if (isset($ThisFileInfo['id3v2']['headerlength'])) {
47 $synchoffsetwarning .= '(ID3v2 header ends at '.$ThisFileInfo['id3v2']['headerlength'].', then '.($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']).' bytes garbage, ';
48 } else {
49 $synchoffsetwarning .= '(should be at beginning of file, ';
50 }
51 $synchoffsetwarning .= 'synch detected at '.$ThisFileInfo['avdataoffset'].')';
52 if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
53
54 if (!empty($ThisFileInfo['id3v2']['headerlength']) && (($ThisFileInfo['avdataoffset'] - $ThisFileInfo['id3v2']['headerlength']) == $ThisFileInfo['mpeg']['audio']['framelength'])) {
55
56 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
57 $ThisFileInfo['audio']['codec'] = 'LAME';
58 $CurrentDataLAMEversionString = 'LAME3.';
59
60 } elseif (empty($ThisFileInfo['id3v2']['headerlength']) && ($ThisFileInfo['avdataoffset'] == $ThisFileInfo['mpeg']['audio']['framelength'])) {
61
62 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
63 $ThisFileInfo['audio']['codec'] = 'LAME';
64 $CurrentDataLAMEversionString = 'LAME3.';
65
66 }
67
68 }
69 $ThisFileInfo['warning'][] = $synchoffsetwarning;
70
71 }
72
73 if (isset($ThisFileInfo['mpeg']['audio']['LAME'])) {
74 $ThisFileInfo['audio']['codec'] = 'LAME';
75 if (!empty($ThisFileInfo['mpeg']['audio']['LAME']['long_version'])) {
76 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['long_version'], "\x00");
77 } elseif (!empty($ThisFileInfo['mpeg']['audio']['LAME']['short_version'])) {
78 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['mpeg']['audio']['LAME']['short_version'], "\x00");
79 }
80 }
81
82 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : @$ThisFileInfo['audio']['encoder']);
83 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {
84 // a version number of LAME that does not end with a number like "LAME3.92"
85 // or with a closing parenthesis like "LAME3.88 (alpha)"
86 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
87
88 // not sure what the actual last frame length will be, but will be less than or equal to 1441
89 $PossiblyLongerLAMEversion_FrameLength = 1441;
90
91 // Not sure what version of LAME this is - look in padding of last frame for longer version string
92 $PossibleLAMEversionStringOffset = $ThisFileInfo['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
93 fseek($fd, $PossibleLAMEversionStringOffset);
94 $PossiblyLongerLAMEversion_Data = fread($fd, $PossiblyLongerLAMEversion_FrameLength);
95 switch (substr($CurrentDataLAMEversionString, -1)) {
96 case 'a':
97 case 'b':
98 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
99 // need to trim off "a" to match longer string
100 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
101 break;
102 }
103 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
104 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
105 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
106 if (strlen($PossiblyLongerLAMEversion_NewString) > strlen(@$ThisFileInfo['audio']['encoder'])) {
107 $ThisFileInfo['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
108 }
109 }
110 }
111 }
112 if (!empty($ThisFileInfo['audio']['encoder'])) {
113 $ThisFileInfo['audio']['encoder'] = rtrim($ThisFileInfo['audio']['encoder'], "\x00 ");
114 }
115
116 switch (@$ThisFileInfo['mpeg']['audio']['layer']) {
117 case 1:
118 case 2:
119 $ThisFileInfo['audio']['dataformat'] = 'mp'.$ThisFileInfo['mpeg']['audio']['layer'];
120 break;
121 }
122 if ($ThisFileInfo['fileformat'] == 'mp3') {
123 switch ($ThisFileInfo['audio']['dataformat']) {
124 case 'mp1':
125 case 'mp2':
126 case 'mp3':
127 $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
128 break;
129
130 default:
131 $ThisFileInfo['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$ThisFileInfo['audio']['dataformat'].'"';
132 break;
133 }
134 }
135
136 if (empty($ThisFileInfo['fileformat'])) {
137 unset($ThisFileInfo['fileformat']);
138 unset($ThisFileInfo['audio']['bitrate_mode']);
139 unset($ThisFileInfo['avdataoffset']);
140 unset($ThisFileInfo['avdataend']);
141 return false;
142 }
143
144 $ThisFileInfo['mime_type'] = 'audio/mpeg';
145 $ThisFileInfo['audio']['lossless'] = false;
146
147 // Calculate playtime
148 if (!isset($ThisFileInfo['playtime_seconds']) && isset($ThisFileInfo['audio']['bitrate']) && ($ThisFileInfo['audio']['bitrate'] > 0)) {
149 $ThisFileInfo['playtime_seconds'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 / $ThisFileInfo['audio']['bitrate'];
150 }
151
153
154 return true;
155 }
getOnlyMPEGaudioInfoBruteForce($fd, &$ThisFileInfo)
Definition: module.audio.mp3.php:1183
getOnlyMPEGaudioInfo($fd, &$ThisFileInfo, $avdataoffset, $BitrateHistogram=false)
Definition: module.audio.mp3.php:1319
GuessEncoderOptions(&$ThisFileInfo)
Definition: module.audio.mp3.php:158
References getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and GuessEncoderOptions().
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◆ getOnlyMPEGaudioInfo()
| getid3_mp3::getOnlyMPEGaudioInfo | ( | $fd, | |
| & | $ThisFileInfo, | ||
| $avdataoffset, | |||
$BitrateHistogram = false |
|||
| ) |
Definition at line 1319 of file module.audio.mp3.php.
1319 {
1320 // looks for synch, decodes MPEG audio header
1321
1322 fseek($fd, $avdataoffset, SEEK_SET);
1323 $header = '';
1324 $SynchSeekOffset = 0;
1325
1326 static $MPEGaudioVersionLookup;
1327 static $MPEGaudioLayerLookup;
1328 static $MPEGaudioBitrateLookup;
1329 if (empty($MPEGaudioVersionLookup)) {
1330 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1331 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1332 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1333
1334 }
1335
1336 $header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2));
1337 while (true) {
1338
1339 if (($SynchSeekOffset > $header_len) && (($avdataoffset + $SynchSeekOffset) < $ThisFileInfo['avdataend']) && !feof($fd)) {
1340
1341 if ($SynchSeekOffset > 131072) {
1342 // if a synch's not found within the first 128k bytes, then give up
1343 $ThisFileInfo['error'][] = 'could not find valid MPEG audio synch within the first 128k bytes';
1344 if (isset($ThisFileInfo['audio']['bitrate'])) {
1345 unset($ThisFileInfo['audio']['bitrate']);
1346 }
1347 if (isset($ThisFileInfo['mpeg']['audio'])) {
1348 unset($ThisFileInfo['mpeg']['audio']);
1349 }
1350 if (empty($ThisFileInfo['mpeg'])) {
1351 unset($ThisFileInfo['mpeg']);
1352 }
1353 return false;
1354
1355 } elseif ($header .= fread($fd, GETID3_FREAD_BUFFER_SIZE)) {
1356
1357 // great
1358 $header_len = strlen($header) - intval(round(GETID3_FREAD_BUFFER_SIZE / 2));
1359
1360 } else {
1361
1362 $ThisFileInfo['error'][] = 'could not find valid MPEG audio synch before end of file';
1363 if (isset($ThisFileInfo['audio']['bitrate'])) {
1364 unset($ThisFileInfo['audio']['bitrate']);
1365 }
1366 if (isset($ThisFileInfo['mpeg']['audio'])) {
1367 unset($ThisFileInfo['mpeg']['audio']);
1368 }
1369 if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || (count($ThisFileInfo['mpeg']) == 0))) {
1370 unset($ThisFileInfo['mpeg']);
1371 }
1372 return false;
1373
1374 }
1375 }
1376
1377 if (($SynchSeekOffset + 1) >= strlen($header)) {
1378 $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
1379 return false;
1380 }
1381
1382 if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
1383
1384 if (!isset($FirstFrameThisfileInfo) && !isset($ThisFileInfo['mpeg']['audio'])) {
1385 $FirstFrameThisfileInfo = $ThisFileInfo;
1386 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1387 if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdataoffset + $SynchSeekOffset, $FirstFrameThisfileInfo, false)) {
1388 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1389 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1390 unset($FirstFrameThisfileInfo);
1391 }
1392 }
1393
1394 $dummy = $ThisFileInfo; // only overwrite real data if valid header found
1396 $ThisFileInfo = $dummy;
1397 $ThisFileInfo['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1398 switch ($ThisFileInfo['fileformat']) {
1399 case '':
1400 case 'id3':
1401 case 'ape':
1402 case 'mp3':
1403 $ThisFileInfo['fileformat'] = 'mp3';
1404 $ThisFileInfo['audio']['dataformat'] = 'mp3';
1405 break;
1406 }
1407 if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1408 if (!(abs($ThisFileInfo['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1409 // If there is garbage data between a valid VBR header frame and a sequence
1410 // of valid MPEG-audio frames the VBR data is no longer discarded.
1411 $ThisFileInfo = $FirstFrameThisfileInfo;
1412 $ThisFileInfo['avdataoffset'] = $FirstFrameAVDataOffset;
1413 $ThisFileInfo['fileformat'] = 'mp3';
1414 $ThisFileInfo['audio']['dataformat'] = 'mp3';
1415 $dummy = $ThisFileInfo;
1416 unset($dummy['mpeg']['audio']);
1417 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1418 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1420
1421 $ThisFileInfo = $dummy;
1422 $ThisFileInfo['avdataoffset'] = $GarbageOffsetEnd;
1423 $ThisFileInfo['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd;
1424
1425 } else {
1426
1427 $ThisFileInfo['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')';
1428
1429 }
1430 }
1431 }
1432 if (isset($ThisFileInfo['mpeg']['audio']['bitrate_mode']) && ($ThisFileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($ThisFileInfo['mpeg']['audio']['VBR_method'])) {
1433 // VBR file with no VBR header
1434 $BitrateHistogram = true;
1435 }
1436
1437 if ($BitrateHistogram) {
1438
1439 $ThisFileInfo['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1440 $ThisFileInfo['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1441
1442 if ($ThisFileInfo['mpeg']['audio']['version'] == '1') {
1443 if ($ThisFileInfo['mpeg']['audio']['layer'] == 3) {
1444 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1445 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 2) {
1446 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1447 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
1448 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1449 }
1450 } elseif ($ThisFileInfo['mpeg']['audio']['layer'] == 1) {
1451 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0);
1452 } else {
1453 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0);
1454 }
1455
1456 $dummy = array('error'=>$ThisFileInfo['error'], 'warning'=>$ThisFileInfo['warning'], 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
1457 $synchstartoffset = $ThisFileInfo['avdataoffset'];
1458
1459 $FastMode = false;
1460 $SynchErrorsFound = 0;
1461 while (getid3_mp3::decodeMPEGaudioHeader($fd, $synchstartoffset, $dummy, false, false, $FastMode)) {
1462 $FastMode = true;
1463 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1464
1465 if (empty($dummy['mpeg']['audio']['framelength'])) {
1466 $SynchErrorsFound++;
1467 } else {
1468 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++;
1469 $ThisFileInfo['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++;
1470 $ThisFileInfo['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++;
1471
1472 $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1473 }
1474 }
1475 if ($SynchErrorsFound > 0) {
1476 $ThisFileInfo['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis';
1477 //return false;
1478 }
1479
1480 $bittotal = 0;
1481 $framecounter = 0;
1482 foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1483 $framecounter += $bitratecount;
1484 if ($bitratevalue != 'free') {
1485 $bittotal += ($bitratevalue * $bitratecount);
1486 }
1487 }
1488 if ($framecounter == 0) {
1489 $ThisFileInfo['error'][] = 'Corrupt MP3 file: framecounter == zero';
1490 return false;
1491 }
1492 $ThisFileInfo['mpeg']['audio']['frame_count'] = $framecounter;
1493 $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1494
1495 $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
1496
1497
1498 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1499 $distinct_bitrates = 0;
1500 foreach ($ThisFileInfo['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1501 if ($bitrate_count > 0) {
1502 $distinct_bitrates++;
1503 }
1504 }
1505 if ($distinct_bitrates > 1) {
1506 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'vbr';
1507 } else {
1508 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = 'cbr';
1509 }
1510 $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
1511
1512 }
1513
1514 break; // exit while()
1515 }
1516 }
1517
1518 $SynchSeekOffset++;
1519 if (($avdataoffset + $SynchSeekOffset) >= $ThisFileInfo['avdataend']) {
1520 // end of file/data
1521
1522 if (empty($ThisFileInfo['mpeg']['audio'])) {
1523
1524 $ThisFileInfo['error'][] = 'could not find valid MPEG synch before end of file';
1525 if (isset($ThisFileInfo['audio']['bitrate'])) {
1526 unset($ThisFileInfo['audio']['bitrate']);
1527 }
1528 if (isset($ThisFileInfo['mpeg']['audio'])) {
1529 unset($ThisFileInfo['mpeg']['audio']);
1530 }
1531 if (isset($ThisFileInfo['mpeg']) && (!is_array($ThisFileInfo['mpeg']) || empty($ThisFileInfo['mpeg']))) {
1532 unset($ThisFileInfo['mpeg']);
1533 }
1534 return false;
1535
1536 }
1537 break;
1538 }
1539
1540 }
1541 $ThisFileInfo['audio']['channels'] = $ThisFileInfo['mpeg']['audio']['channels'];
1542 $ThisFileInfo['audio']['channelmode'] = $ThisFileInfo['mpeg']['audio']['channelmode'];
1543 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
1544 return true;
1545 }
decodeMPEGaudioHeader($fd, $offset, &$ThisFileInfo, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
Definition: module.audio.mp3.php:401
References decodeMPEGaudioHeader(), GETID3_FREAD_BUFFER_SIZE, MPEGaudioBitrateArray(), MPEGaudioLayerArray(), and MPEGaudioVersionArray().
Referenced by getid3_mp3(), getid3_quicktime\getid3_quicktime(), and getid3_riff\ParseRIFF().
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◆ getOnlyMPEGaudioInfoBruteForce()
| getid3_mp3::getOnlyMPEGaudioInfoBruteForce | ( | $fd, | |
| & | $ThisFileInfo | ||
| ) |
Definition at line 1183 of file module.audio.mp3.php.
1183 {
1184
1185 $MPEGaudioHeaderDecodeCache = array();
1186 $MPEGaudioHeaderValidCache = array();
1187 $MPEGaudioHeaderLengthCache = array();
1188 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1189 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1190 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1191 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
1192 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
1193 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
1194 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
1195 $LongMPEGversionLookup = array();
1196 $LongMPEGlayerLookup = array();
1197 $LongMPEGbitrateLookup = array();
1198 $LongMPEGpaddingLookup = array();
1199 $LongMPEGfrequencyLookup = array();
1200
1201 $Distribution['bitrate'] = array();
1202 $Distribution['frequency'] = array();
1203 $Distribution['layer'] = array();
1204 $Distribution['version'] = array();
1205 $Distribution['padding'] = array();
1206
1207 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
1208
1209 $previousvalidframe = $ThisFileInfo['avdataoffset'];
1210 while (ftell($fd) < $ThisFileInfo['avdataend']) {
1211 set_time_limit(30);
1212 $head4 = fread($fd, 4);
1213 if (strlen($head4) < 4) {
1214 break;
1215 }
1216 if ($head4{0} != "\xFF") {
1217 for ($i = 1; $i < 4; $i++) {
1218 if ($head4{$i} == "\xFF") {
1219 fseek($fd, $i - 4, SEEK_CUR);
1220 continue 2;
1221 }
1222 }
1223 continue;
1224 }
1225 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1226 $MPEGaudioHeaderDecodeCache[$head4] = getid3_mp3::MPEGaudioHeaderDecode($head4);
1227 }
1228 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1229 $MPEGaudioHeaderValidCache[$head4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1230 }
1231 if ($MPEGaudioHeaderValidCache[$head4]) {
1232
1233 if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1234 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1235 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1236 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1237 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1238 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1239 $MPEGaudioHeaderLengthCache[$head4] = getid3_mp3::MPEGaudioFrameLength(
1240 $LongMPEGbitrateLookup[$head4],
1241 $LongMPEGversionLookup[$head4],
1242 $LongMPEGlayerLookup[$head4],
1243 $LongMPEGpaddingLookup[$head4],
1244 $LongMPEGfrequencyLookup[$head4]);
1245 }
1246 if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1247 $WhereWeWere = ftell($fd);
1248 fseek($fd, $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1249 $next4 = fread($fd, 4);
1250 if ($next4{0} == "\xFF") {
1251 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1252 $MPEGaudioHeaderDecodeCache[$next4] = getid3_mp3::MPEGaudioHeaderDecode($next4);
1253 }
1254 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1255 $MPEGaudioHeaderValidCache[$next4] = getid3_mp3::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1256 }
1257 if ($MPEGaudioHeaderValidCache[$next4]) {
1258 fseek($fd, -4, SEEK_CUR);
1259
1260 @$Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]++;
1261 @$Distribution['layer'][$LongMPEGlayerLookup[$head4]]++;
1262 @$Distribution['version'][$LongMPEGversionLookup[$head4]]++;
1263 @$Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]++;
1264 @$Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]++;
1265 continue;
1266 }
1267 }
1268 unset($next4);
1269 fseek($fd, $WhereWeWere - 3, SEEK_SET);
1270 }
1271
1272 }
1273 }
1274 foreach ($Distribution as $key => $value) {
1275 ksort($Distribution[$key], SORT_NUMERIC);
1276 }
1277 ksort($Distribution['version'], SORT_STRING);
1278 $ThisFileInfo['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1279 $ThisFileInfo['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1280 $ThisFileInfo['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1281 $ThisFileInfo['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1282 $ThisFileInfo['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1283 if (count($Distribution['version']) > 1) {
1284 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG version detected';
1285 }
1286 if (count($Distribution['layer']) > 1) {
1287 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG layer detected';
1288 }
1289 if (count($Distribution['frequency']) > 1) {
1290 $ThisFileInfo['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
1291 }
1292
1293
1294 $bittotal = 0;
1295 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1296 if ($bitratevalue != 'free') {
1297 $bittotal += ($bitratevalue * $bitratecount);
1298 }
1299 }
1300 $ThisFileInfo['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1301 if ($ThisFileInfo['mpeg']['audio']['frame_count'] == 0) {
1302 $ThisFileInfo['error'][] = 'no MPEG audio frames found';
1303 return false;
1304 }
1305 $ThisFileInfo['mpeg']['audio']['bitrate'] = ($bittotal / $ThisFileInfo['mpeg']['audio']['frame_count']);
1306 $ThisFileInfo['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1307 $ThisFileInfo['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1308
1309 $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpeg']['audio']['bitrate'];
1310 $ThisFileInfo['audio']['bitrate_mode'] = $ThisFileInfo['mpeg']['audio']['bitrate_mode'];
1311 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['mpeg']['audio']['sample_rate'];
1312 $ThisFileInfo['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1313 $ThisFileInfo['fileformat'] = $ThisFileInfo['audio']['dataformat'];
1314
1315 return true;
1316 }
References getid3_lib\array_max(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), and MPEGaudioVersionArray().
Referenced by getid3_mp3().
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◆ GuessEncoderOptions()
| getid3_mp3::GuessEncoderOptions | ( | & | $ThisFileInfo | ) |
Definition at line 158 of file module.audio.mp3.php.
158 {
159 // shortcuts
160 if (!empty($ThisFileInfo['mpeg']['audio'])) {
161 $thisfile_mpeg_audio = &$ThisFileInfo['mpeg']['audio'];
162 if (!empty($thisfile_mpeg_audio['LAME'])) {
163 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
164 }
165 }
166
167 $encoder_options = '';
168 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
169
170 if ((@$thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
171
172 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
173
174 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
175
176 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
177
178 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
179
180 static $KnownEncoderValues = array();
181 if (empty($KnownEncoderValues)) {
182
183 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
184 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
185 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
186 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
187 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
188 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
189 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
190 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
191 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
192 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
193 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
194 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
195 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
196 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
197 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
198 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
199 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
200 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
201
202 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
203 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
204 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
205 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
206 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
207 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
208 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
209 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
210 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
211 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
212 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
213 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
214 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
215 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
216 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
217 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
218 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
219 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
220 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
221 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
222 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
223 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
224 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
225 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
226 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
227 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
228 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
229 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
230 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
231 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
232 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
233 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
234 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
235 }
236
237 if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
238
239 $encoder_options = $KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
240
241 } elseif (isset($KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) {
242
243 $encoder_options = $KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
244
245 } elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'vbr') {
246
247 // http://gabriel.mp3-tech.org/mp3infotag.html
248 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
249
250
251 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
252 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
253 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
254
255 } elseif ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
256
257 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
258
259 } else {
260
261 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
262
263 }
264
265 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
266
267 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
268
269 } elseif (!empty($ThisFileInfo['audio']['bitrate'])) {
270
271 if ($ThisFileInfo['audio']['bitrate_mode'] == 'cbr') {
272 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
273 } else {
274 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
275 }
276
277 }
278 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
279 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
280 }
281
282 if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) {
283 $encoder_options .= ' --nogap';
284 }
285
286 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
287 $ExplodedOptions = explode(' ', $encoder_options, 4);
288 if ($ExplodedOptions[0] == '--r3mix') {
289 $ExplodedOptions[1] = 'r3mix';
290 }
291 switch ($ExplodedOptions[0]) {
292 case '--preset':
293 case '--alt-preset':
294 case '--r3mix':
295 if ($ExplodedOptions[1] == 'fast') {
296 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
297 }
298 switch ($ExplodedOptions[1]) {
299 case 'portable':
300 case 'medium':
301 case 'standard':
302 case 'extreme':
303 case 'insane':
304 case 'fast portable':
305 case 'fast medium':
306 case 'fast standard':
307 case 'fast extreme':
308 case 'fast insane':
309 case 'r3mix':
310 static $ExpectedLowpass = array(
311 'insane|20500' => 20500,
312 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
313 'medium|18000' => 18000,
314 'fast medium|18000' => 18000,
315 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
316 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
317 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
318 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
319 'standard|19000' => 19000,
320 'fast standard|19000' => 19000,
321 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
322 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
323 'r3mix|18000' => 18000, // 3.94, 3.95
324 );
325 if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) {
326 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
327 }
328 break;
329
330 default:
331 break;
332 }
333 break;
334 }
335 }
336
337 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
338 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
339 $encoder_options .= ' --resample 44100';
340 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
341 $encoder_options .= ' --resample 48000';
342 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
343 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
344 case 0: // <= 32000
345 // may or may not be same as source frequency - ignore
346 break;
347 case 1: // 44100
348 case 2: // 48000
349 case 3: // 48000+
350 $ExplodedOptions = explode(' ', $encoder_options, 4);
351 switch ($ExplodedOptions[0]) {
352 case '--preset':
353 case '--alt-preset':
354 switch ($ExplodedOptions[1]) {
355 case 'fast':
356 case 'portable':
357 case 'medium':
358 case 'standard':
359 case 'extreme':
360 case 'insane':
361 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
362 break;
363
364 default:
365 static $ExpectedResampledRate = array(
366 'phon+/lw/mw-eu/sw|16000' => 16000,
367 'mw-us|24000' => 24000, // 3.95
368 'mw-us|32000' => 32000, // 3.93
369 'mw-us|16000' => 16000, // 3.92
370 'phone|16000' => 16000,
371 'phone|11025' => 11025, // 3.94a15
372 'radio|32000' => 32000, // 3.94a15
373 'fm/radio|32000' => 32000, // 3.92
374 'fm|32000' => 32000, // 3.90
375 'voice|32000' => 32000);
376 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
377 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
378 }
379 break;
380 }
381 break;
382
383 case '--r3mix':
384 default:
385 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
386 break;
387 }
388 break;
389 }
390 }
391 }
392 if (empty($encoder_options) && !empty($ThisFileInfo['audio']['bitrate']) && !empty($ThisFileInfo['audio']['bitrate_mode'])) {
393 //$encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']).ceil($ThisFileInfo['audio']['bitrate'] / 1000);
394 $encoder_options = strtoupper($ThisFileInfo['audio']['bitrate_mode']);
395 }
396
397 return $encoder_options;
398 }
Referenced by getid3_mp3(), and getid3_riff\getid3_riff().
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◆ LAMEmiscSourceSampleFrequencyLookup()
| getid3_mp3::LAMEmiscSourceSampleFrequencyLookup | ( | $SourceSampleFrequencyID | ) |
Definition at line 1862 of file module.audio.mp3.php.
1862 {
1863 static $LAMEmiscSourceSampleFrequencyLookup = array(
1864 0 => '<= 32 kHz',
1865 1 => '44.1 kHz',
1866 2 => '48 kHz',
1867 3 => '> 48kHz'
1868 );
1869 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
1870 }
Referenced by decodeMPEGaudioHeader().
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◆ LAMEmiscStereoModeLookup()
| getid3_mp3::LAMEmiscStereoModeLookup | ( | $StereoModeID | ) |
Definition at line 1848 of file module.audio.mp3.php.
1848 {
1849 static $LAMEmiscStereoModeLookup = array(
1850 0 => 'mono',
1851 1 => 'stereo',
1852 2 => 'dual mono',
1853 3 => 'joint stereo',
1854 4 => 'forced stereo',
1855 5 => 'auto',
1856 6 => 'intensity stereo',
1857 7 => 'other'
1858 );
1859 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
1860 }
Referenced by decodeMPEGaudioHeader().
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◆ LAMEpresetUsedLookup()
| getid3_mp3::LAMEpresetUsedLookup | ( | $LAMEtag | ) |
Definition at line 1882 of file module.audio.mp3.php.
1882 {
1883
1884 if ($LAMEtag['preset_used_id'] == 0) {
1885 // no preset used (LAME >=3.93)
1886 // no preset recorded (LAME <3.93)
1887 return '';
1888 }
1889 $LAMEpresetUsedLookup = array();
1890
1892 for ($i = 8; $i <= 320; $i++) {
1893 switch ($LAMEtag['vbr_method']) {
1894 case 'cbr':
1895 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
1896 break;
1897 case 'abr':
1898 default: // other VBR modes shouldn't be here(?)
1899 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
1900 break;
1901 }
1902 }
1903
1904 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
1905
1906 // named alt-presets
1907 $LAMEpresetUsedLookup[1000] = '--r3mix';
1908 $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
1909 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
1910 $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
1911 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
1912 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
1913 $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
1914 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
1915
1916 // LAME 3.94 additions/changes
1917 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
1918 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
1919
1920 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
1921 $LAMEpresetUsedLookup[410] = '-V9';
1922 $LAMEpresetUsedLookup[420] = '-V8';
1923 $LAMEpresetUsedLookup[440] = '-V6';
1924 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
1925 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
1926 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
1927 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
1928 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
1929 $LAMEpresetUsedLookup[490] = '-V1';
1930 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
1931
1932 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
1933 }
Referenced by decodeMPEGaudioHeader().
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◆ LAMEsurroundInfoLookup()
| getid3_mp3::LAMEsurroundInfoLookup | ( | $SurroundInfoID | ) |
Definition at line 1872 of file module.audio.mp3.php.
1872 {
1873 static $LAMEsurroundInfoLookup = array(
1874 0 => 'no surround info',
1875 1 => 'DPL encoding',
1876 2 => 'DPL2 encoding',
1877 3 => 'Ambisonic encoding'
1878 );
1879 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
1880 }
Referenced by decodeMPEGaudioHeader().
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◆ LAMEvbrMethodLookup()
| getid3_mp3::LAMEvbrMethodLookup | ( | $VBRmethodID | ) |
Definition at line 1832 of file module.audio.mp3.php.
1832 {
1833 static $LAMEvbrMethodLookup = array(
1834 0x00 => 'unknown',
1835 0x01 => 'cbr',
1836 0x02 => 'abr',
1837 0x03 => 'vbr-old / vbr-rh',
1838 0x04 => 'vbr-new / vbr-mtrh',
1839 0x05 => 'vbr-mt',
1840 0x06 => 'Full VBR Method 4',
1841 0x08 => 'constant bitrate 2 pass',
1842 0x09 => 'abr 2 pass',
1843 0x0F => 'reserved'
1844 );
1845 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
1846 }
Referenced by decodeMPEGaudioHeader().
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◆ MPEGaudioBitrateArray()
| getid3_mp3::MPEGaudioBitrateArray | ( | ) |
Definition at line 1558 of file module.audio.mp3.php.
1558 {
1559 static $MPEGaudioBitrate;
1560 if (empty($MPEGaudioBitrate)) {
1561 $MPEGaudioBitrate = array (
1562 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1563 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1564 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1565 ),
1566
1567 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1568 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1569 )
1570 );
1571 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1572 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1573 }
1574 return $MPEGaudioBitrate;
1575 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioChannelModeArray()
| getid3_mp3::MPEGaudioChannelModeArray | ( | ) |
Definition at line 1589 of file module.audio.mp3.php.
1589 {
1590 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1591 return $MPEGaudioChannelMode;
1592 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioEmphasisArray()
| getid3_mp3::MPEGaudioEmphasisArray | ( | ) |
Definition at line 1606 of file module.audio.mp3.php.
1606 {
1607 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1608 return $MPEGaudioEmphasis;
1609 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioFrameLength()
| getid3_mp3::MPEGaudioFrameLength | ( | & | $bitrate, |
| & | $version, | ||
| & | $layer, | ||
| $padding, | |||
| & | $samplerate | ||
| ) |
Definition at line 1724 of file module.audio.mp3.php.
1724 {
1725 static $AudioFrameLengthCache = array();
1726
1727 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1728 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1729 if ($bitrate != 'free') {
1730
1731 if ($version == '1') {
1732
1733 if ($layer == '1') {
1734
1735 // For Layer I slot is 32 bits long
1736 $FrameLengthCoefficient = 48;
1737 $SlotLength = 4;
1738
1739 } else { // Layer 2 / 3
1740
1741 // for Layer 2 and Layer 3 slot is 8 bits long.
1742 $FrameLengthCoefficient = 144;
1743 $SlotLength = 1;
1744
1745 }
1746
1747 } else { // MPEG-2 / MPEG-2.5
1748
1749 if ($layer == '1') {
1750
1751 // For Layer I slot is 32 bits long
1752 $FrameLengthCoefficient = 24;
1753 $SlotLength = 4;
1754
1755 } elseif ($layer == '2') {
1756
1757 // for Layer 2 and Layer 3 slot is 8 bits long.
1758 $FrameLengthCoefficient = 144;
1759 $SlotLength = 1;
1760
1761 } else { // layer 3
1762
1763 // for Layer 2 and Layer 3 slot is 8 bits long.
1764 $FrameLengthCoefficient = 72;
1765 $SlotLength = 1;
1766
1767 }
1768
1769 }
1770
1771 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1772 if ($samplerate > 0) {
1773 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1774 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1775 if ($padding) {
1776 $NewFramelength += $SlotLength;
1777 }
1778 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1779 }
1780 }
1781 }
1782 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1783 }
Referenced by decodeMPEGaudioHeader(), and getOnlyMPEGaudioInfoBruteForce().
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◆ MPEGaudioFrequencyArray()
| getid3_mp3::MPEGaudioFrequencyArray | ( | ) |
Definition at line 1577 of file module.audio.mp3.php.
1577 {
1578 static $MPEGaudioFrequency;
1579 if (empty($MPEGaudioFrequency)) {
1580 $MPEGaudioFrequency = array (
1581 '1' => array(44100, 48000, 32000),
1582 '2' => array(22050, 24000, 16000),
1583 '2.5' => array(11025, 12000, 8000)
1584 );
1585 }
1586 return $MPEGaudioFrequency;
1587 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioHeaderBytesValid()
| getid3_mp3::MPEGaudioHeaderBytesValid | ( | $head4, | |
$allowBitrate15 = false |
|||
| ) |
Definition at line 1611 of file module.audio.mp3.php.
1611 {
1612 return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1613 }
References MPEGaudioHeaderDecode(), and MPEGaudioHeaderValid().
Referenced by getid3_riff\ParseRIFF().
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◆ MPEGaudioHeaderDecode()
| getid3_mp3::MPEGaudioHeaderDecode | ( | $Header4Bytes | ) |
Definition at line 1687 of file module.audio.mp3.php.
1687 {
1688 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1689 // A - Frame sync (all bits set)
1690 // B - MPEG Audio version ID
1691 // C - Layer description
1692 // D - Protection bit
1693 // E - Bitrate index
1694 // F - Sampling rate frequency index
1695 // G - Padding bit
1696 // H - Private bit
1697 // I - Channel Mode
1698 // J - Mode extension (Only if Joint stereo)
1699 // K - Copyright
1700 // L - Original
1701 // M - Emphasis
1702
1703 if (strlen($Header4Bytes) != 4) {
1704 return false;
1705 }
1706
1707 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1708 $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
1709 $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
1710 $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
1711 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
1712 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
1713 $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
1714 $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
1715 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
1716 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
1717 $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
1718 $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
1719 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
1720
1721 return $MPEGrawHeader;
1722 }
References getid3_lib\BigEndian2Int().
Referenced by decodeMPEGaudioHeader(), getid3_quicktime\getid3_quicktime(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderBytesValid().
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◆ MPEGaudioHeaderValid()
| getid3_mp3::MPEGaudioHeaderValid | ( | $rawarray, | |
$echoerrors = false, |
|||
$allowBitrate15 = false |
|||
| ) |
Definition at line 1615 of file module.audio.mp3.php.
1615 {
1616 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1617 return false;
1618 }
1619
1620 static $MPEGaudioVersionLookup;
1621 static $MPEGaudioLayerLookup;
1622 static $MPEGaudioBitrateLookup;
1623 static $MPEGaudioFrequencyLookup;
1624 static $MPEGaudioChannelModeLookup;
1625 static $MPEGaudioModeExtensionLookup;
1626 static $MPEGaudioEmphasisLookup;
1627 if (empty($MPEGaudioVersionLookup)) {
1628 $MPEGaudioVersionLookup = getid3_mp3::MPEGaudioVersionArray();
1629 $MPEGaudioLayerLookup = getid3_mp3::MPEGaudioLayerArray();
1630 $MPEGaudioBitrateLookup = getid3_mp3::MPEGaudioBitrateArray();
1631 $MPEGaudioFrequencyLookup = getid3_mp3::MPEGaudioFrequencyArray();
1632 $MPEGaudioChannelModeLookup = getid3_mp3::MPEGaudioChannelModeArray();
1633 $MPEGaudioModeExtensionLookup = getid3_mp3::MPEGaudioModeExtensionArray();
1634 $MPEGaudioEmphasisLookup = getid3_mp3::MPEGaudioEmphasisArray();
1635 }
1636
1637 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1638 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1639 } else {
1640 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1641 return false;
1642 }
1643 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1644 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1645 } else {
1646 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1647 return false;
1648 }
1649 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1650 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1651 if ($rawarray['bitrate'] == 15) {
1652 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1653 // let it go through here otherwise file will not be identified
1654 if (!$allowBitrate15) {
1655 return false;
1656 }
1657 } else {
1658 return false;
1659 }
1660 }
1661 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1662 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1663 return false;
1664 }
1665 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1666 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1667 return false;
1668 }
1669 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1670 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1671 return false;
1672 }
1673 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1674 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1675 return false;
1676 }
1677 // These are just either set or not set, you can't mess that up :)
1678 // $rawarray['protection'];
1679 // $rawarray['padding'];
1680 // $rawarray['private'];
1681 // $rawarray['copyright'];
1682 // $rawarray['original'];
1683
1684 return true;
1685 }
References MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrequencyArray(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), and MPEGaudioVersionArray().
Referenced by decodeMPEGaudioHeader(), getid3_quicktime\getid3_quicktime(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderBytesValid().
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◆ MPEGaudioLayerArray()
| getid3_mp3::MPEGaudioLayerArray | ( | ) |
Definition at line 1553 of file module.audio.mp3.php.
1553 {
1554 static $MPEGaudioLayer = array(false, 3, 2, 1);
1555 return $MPEGaudioLayer;
1556 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioModeExtensionArray()
| getid3_mp3::MPEGaudioModeExtensionArray | ( | ) |
Definition at line 1594 of file module.audio.mp3.php.
1594 {
1595 static $MPEGaudioModeExtension;
1596 if (empty($MPEGaudioModeExtension)) {
1597 $MPEGaudioModeExtension = array (
1598 1 => array('4-31', '8-31', '12-31', '16-31'),
1599 2 => array('4-31', '8-31', '12-31', '16-31'),
1600 3 => array('', 'IS', 'MS', 'IS+MS')
1601 );
1602 }
1603 return $MPEGaudioModeExtension;
1604 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ MPEGaudioVersionArray()
| getid3_mp3::MPEGaudioVersionArray | ( | ) |
Definition at line 1548 of file module.audio.mp3.php.
1548 {
1549 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1550 return $MPEGaudioVersion;
1551 }
Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().
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◆ RecursiveFrameScanning()
| getid3_mp3::RecursiveFrameScanning | ( | & | $fd, |
| & | $ThisFileInfo, | ||
| & | $offset, | ||
| & | $nextframetestoffset, | ||
| $ScanAsCBR | |||
| ) |
Definition at line 1070 of file module.audio.mp3.php.
1070 {
1072 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1073 if (($nextframetestoffset + 4) >= $ThisFileInfo['avdataend']) {
1074 // end of file
1075 return true;
1076 }
1077
1078 $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$ThisFileInfo['avdataend'], 'avdataoffset'=>$ThisFileInfo['avdataoffset']);
1079 if (getid3_mp3::decodeMPEGaudioHeader($fd, $nextframetestoffset, $nextframetestarray, false)) {
1080 if ($ScanAsCBR) {
1081 // force CBR mode, used for trying to pick out invalid audio streams with
1082 // valid(?) VBR headers, or VBR streams with no VBR header
1083 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($ThisFileInfo['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $ThisFileInfo['mpeg']['audio']['bitrate'])) {
1084 return false;
1085 }
1086 }
1087
1088
1089 // next frame is OK, get ready to check the one after that
1090 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1091 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1092 } else {
1093 $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.';
1094 return false;
1095 }
1096
1097 } else {
1098
1099 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1100 $ThisFileInfo['error'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.';
1101
1102 return false;
1103 }
1104 }
1105 return true;
1106 }
const GETID3_MP3_VALID_CHECK_FRAMES
getID3() by James Heinrich info@getid3.org //
Definition: module.audio.mp3.php:21
References decodeMPEGaudioHeader(), and GETID3_MP3_VALID_CHECK_FRAMES.
Referenced by decodeMPEGaudioHeader().
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◆ XingVBRidOffset()
| getid3_mp3::XingVBRidOffset | ( | $version, | |
| $channelmode | |||
| ) |
Definition at line 1806 of file module.audio.mp3.php.
1806 {
1807 static $XingVBRidOffsetCache = array();
1808 if (empty($XingVBRidOffset)) {
1809 $XingVBRidOffset = array (
1810 '1' => array ('mono' => 0x15, // 4 + 17 = 21
1811 'stereo' => 0x24, // 4 + 32 = 36
1812 'joint stereo' => 0x24,
1813 'dual channel' => 0x24
1814 ),
1815
1816 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
1817 'stereo' => 0x15, // 4 + 17 = 21
1818 'joint stereo' => 0x15,
1819 'dual channel' => 0x15
1820 ),
1821
1822 '2.5' => array ('mono' => 0x15,
1823 'stereo' => 0x15,
1824 'joint stereo' => 0x15,
1825 'dual channel' => 0x15
1826 )
1827 );
1828 }
1829 return $XingVBRidOffset[$version][$channelmode];
1830 }
Referenced by decodeMPEGaudioHeader().
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Field Documentation
◆ $allow_bruteforce
| getid3_mp3::$allow_bruteforce = false |
Definition at line 27 of file module.audio.mp3.php.
The documentation for this class was generated from the following file:
- Services/MediaObjects/getid3/getid3/module.audio.mp3.php
