ILIAS  release_5-3 Revision v5.3.23-19-g915713cf615
Public Member Functions | Static Public Member Functions | Data Fields
getid3_mp3 Class Reference
+ Inheritance diagram for getid3_mp3:
+ Collaboration diagram for getid3_mp3:

Public Member Functions

 Analyze ()
 
 GuessEncoderOptions ()
 
 decodeMPEGaudioHeader ($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
 
 RecursiveFrameScanning (&$offset, &$nextframetestoffset, $ScanAsCBR)
 
 FreeFormatFrameLength ($offset, $deepscan=false)
 
 getOnlyMPEGaudioInfoBruteForce ()
 
 getOnlyMPEGaudioInfo ($avdataoffset, $BitrateHistogram=false)
 
- Public Member Functions inherited from getid3_handler
 __construct (getID3 $getid3, $call_module=null)
 
 Analyze ()
 
 AnalyzeString ($string)
 
 setStringMode ($string)
 
 saveAttachment ($name, $offset, $length, $image_mime=null)
 

Static Public Member Functions

static MPEGaudioVersionArray ()
 
static MPEGaudioLayerArray ()
 
static MPEGaudioBitrateArray ()
 
static MPEGaudioFrequencyArray ()
 
static MPEGaudioChannelModeArray ()
 
static MPEGaudioModeExtensionArray ()
 
static MPEGaudioEmphasisArray ()
 
static MPEGaudioHeaderBytesValid ($head4, $allowBitrate15=false)
 
static MPEGaudioHeaderValid ($rawarray, $echoerrors=false, $allowBitrate15=false)
 
static MPEGaudioHeaderDecode ($Header4Bytes)
 
static MPEGaudioFrameLength (&$bitrate, &$version, &$layer, $padding, &$samplerate)
 
static ClosestStandardMP3Bitrate ($bit_rate)
 
static XingVBRidOffset ($version, $channelmode)
 
static LAMEvbrMethodLookup ($VBRmethodID)
 
static LAMEmiscStereoModeLookup ($StereoModeID)
 
static LAMEmiscSourceSampleFrequencyLookup ($SourceSampleFrequencyID)
 
static LAMEsurroundInfoLookup ($SurroundInfoID)
 
static LAMEpresetUsedLookup ($LAMEtag)
 

Data Fields

 $allow_bruteforce = false
 

Additional Inherited Members

- Protected Member Functions inherited from getid3_handler
 ftell ()
 
 fread ($bytes)
 
 fseek ($bytes, $whence=SEEK_SET)
 
 feof ()
 
 isDependencyFor ($module)
 
 error ($text)
 
 warning ($text)
 
 notice ($text)
 
- Protected Attributes inherited from getid3_handler
 $getid3
 
 $data_string_flag = false
 
 $data_string = ''
 
 $data_string_position = 0
 
 $data_string_length = 0
 

Detailed Description

Definition at line 25 of file module.audio.mp3.php.

Member Function Documentation

◆ Analyze()

getid3_mp3::Analyze ( )

Reimplemented from getid3_handler.

Definition at line 30 of file module.audio.mp3.php.

30 {
31 $info = &$this->getid3->info;
32
33 $initialOffset = $info['avdataoffset'];
34
35 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
36 if ($this->allow_bruteforce) {
37 $this->error('Rescanning file in BruteForce mode');
38 $this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
39 }
40 }
41
42
43 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
44 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
45 }
46
47 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
48
49 $synchoffsetwarning = 'Unknown data before synch ';
50 if (isset($info['id3v2']['headerlength'])) {
51 $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';
52 } elseif ($initialOffset > 0) {
53 $synchoffsetwarning .= '(should be at '.$initialOffset.', ';
54 } else {
55 $synchoffsetwarning .= '(should be at beginning of file, ';
56 }
57 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';
58 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
59
60 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['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 $info['audio']['codec'] = 'LAME';
64 $CurrentDataLAMEversionString = 'LAME3.';
65
66 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
67
68 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
69 $info['audio']['codec'] = 'LAME';
70 $CurrentDataLAMEversionString = 'LAME3.';
71
72 }
73
74 }
75 $this->warning($synchoffsetwarning);
76
77 }
78
79 if (isset($info['mpeg']['audio']['LAME'])) {
80 $info['audio']['codec'] = 'LAME';
81 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
82 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");
83 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
84 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");
85 }
86 }
87
88 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
89 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\‍)]', substr($CurrentDataLAMEversionString, -1))) {
90 // a version number of LAME that does not end with a number like "LAME3.92"
91 // or with a closing parenthesis like "LAME3.88 (alpha)"
92 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
93
94 // not sure what the actual last frame length will be, but will be less than or equal to 1441
95 $PossiblyLongerLAMEversion_FrameLength = 1441;
96
97 // Not sure what version of LAME this is - look in padding of last frame for longer version string
98 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
99 $this->fseek($PossibleLAMEversionStringOffset);
100 $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);
101 switch (substr($CurrentDataLAMEversionString, -1)) {
102 case 'a':
103 case 'b':
104 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
105 // need to trim off "a" to match longer string
106 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);
107 break;
108 }
109 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) {
110 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
111 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
112 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
113 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
114 }
115 }
116 }
117 }
118 if (!empty($info['audio']['encoder'])) {
119 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
120 }
121
122 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
123 case 1:
124 case 2:
125 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer'];
126 break;
127 }
128 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
129 switch ($info['audio']['dataformat']) {
130 case 'mp1':
131 case 'mp2':
132 case 'mp3':
133 $info['fileformat'] = $info['audio']['dataformat'];
134 break;
135
136 default:
137 $this->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"');
138 break;
139 }
140 }
141
142 if (empty($info['fileformat'])) {
143 unset($info['fileformat']);
144 unset($info['audio']['bitrate_mode']);
145 unset($info['avdataoffset']);
146 unset($info['avdataend']);
147 return false;
148 }
149
150 $info['mime_type'] = 'audio/mpeg';
151 $info['audio']['lossless'] = false;
152
153 // Calculate playtime
154 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
155 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
156 }
157
158 $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
159
160 return true;
161 }
getid3_handler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: getid3.php:1711
getid3_handler\fread
fread($bytes)
Definition: getid3.php:1683
getid3_handler\warning
warning($text)
Definition: getid3.php:1758
getid3_handler\error
error($text)
Definition: getid3.php:1752
getid3_mp3\getOnlyMPEGaudioInfo
getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false)
Definition: module.audio.mp3.php:1356
getid3_mp3\getOnlyMPEGaudioInfoBruteForce
getOnlyMPEGaudioInfoBruteForce()
Definition: module.audio.mp3.php:1208
getid3_mp3\GuessEncoderOptions
GuessEncoderOptions()
Definition: module.audio.mp3.php:164
$info
$info
Definition: index.php:5

References $info, getid3_handler\error(), getid3_handler\fread(), getid3_handler\fseek(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), GuessEncoderOptions(), and getid3_handler\warning().

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◆ ClosestStandardMP3Bitrate()

static getid3_mp3::ClosestStandardMP3Bitrate (   $bit_rate)
static

Definition at line 1873 of file module.audio.mp3.php.

1873 {
1874 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
1875 static $bit_rate_table = array (0=>'-');
1876 $round_bit_rate = intval(round($bit_rate, -3));
1877 if (!isset($bit_rate_table[$round_bit_rate])) {
1878 if ($round_bit_rate > max($standard_bit_rates)) {
1879 $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate));
1880 } else {
1881 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
1882 foreach ($standard_bit_rates as $standard_bit_rate) {
1883 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
1884 break;
1885 }
1886 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
1887 }
1888 }
1889 }
1890 return $bit_rate_table[$round_bit_rate];
1891 }

Referenced by decodeMPEGaudioHeader().

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◆ decodeMPEGaudioHeader()

getid3_mp3::decodeMPEGaudioHeader (   $offset,
&  $info,
  $recursivesearch = true,
  $ScanAsCBR = false,
  $FastMPEGheaderScan = false 
)

Definition at line 408 of file module.audio.mp3.php.

408 {
409 static $MPEGaudioVersionLookup;
410 static $MPEGaudioLayerLookup;
411 static $MPEGaudioBitrateLookup;
412 static $MPEGaudioFrequencyLookup;
413 static $MPEGaudioChannelModeLookup;
414 static $MPEGaudioModeExtensionLookup;
415 static $MPEGaudioEmphasisLookup;
416 if (empty($MPEGaudioVersionLookup)) {
417 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
418 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
419 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
420 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
421 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
422 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
423 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
424 }
425
426 if ($this->fseek($offset) != 0) {
427 $this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset);
428 return false;
429 }
430 //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
431 $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
432
433 // MP3 audio frame structure:
434 // $aa $aa $aa $aa [$bb $bb] $cc...
435 // where $aa..$aa is the four-byte mpeg-audio header (below)
436 // $bb $bb is the optional 2-byte CRC
437 // and $cc... is the audio data
438
439 $head4 = substr($headerstring, 0, 4);
440 static $MPEGaudioHeaderDecodeCache = array();
441 if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
442 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
443 } else {
444 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
445 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
446 }
447
448 static $MPEGaudioHeaderValidCache = array();
449 if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache
450 //$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
451 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
452 }
453
454 // shortcut
455 if (!isset($info['mpeg']['audio'])) {
456 $info['mpeg']['audio'] = array();
457 }
458 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
459
460
461 if ($MPEGaudioHeaderValidCache[$head4]) {
462 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
463 } else {
464 $this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset);
465 return false;
466 }
467
468 if (!$FastMPEGheaderScan) {
469 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
470 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
471
472 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
473 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
474 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
475 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
476 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
477 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
478 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
479 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
480 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
481
482 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
483 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
484
485 if ($thisfile_mpeg_audio['protection']) {
486 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
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 $this->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 == $info['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 $info['audio']['dataformat'] = 'mp2';
508 switch ($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 $this->error($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 $this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
526 return false;
527 }
528 break;
529
530 }
531
532 }
533
534
535 if ($info['audio']['sample_rate'] > 0) {
536 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
537 }
538
539 $nextframetestoffset = $offset + 1;
540 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
541
542 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
543
544 if (isset($thisfile_mpeg_audio['framelength'])) {
545 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
546 } else {
547 $this->error('Frame at offset('.$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 $info['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 $VBRidOffset = self::XingVBRidOffset($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 if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
652 $used_filesize = 0;
653 if (!empty($thisfile_mpeg_audio['VBR_bytes'])) {
654 $used_filesize = $thisfile_mpeg_audio['VBR_bytes'];
655 } elseif (!empty($info['filesize'])) {
656 $used_filesize = $info['filesize'];
657 $used_filesize -= intval(@$info['id3v2']['headerlength']);
658 $used_filesize -= (isset($info['id3v1']) ? 128 : 0);
659 $used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
660 $this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes');
661 }
662
663 $framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames'];
664
665 if ($thisfile_mpeg_audio['layer'] == '1') {
666 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
667 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
668 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
669 } else {
670 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
671 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
672 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
673 }
674 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
675 }
676
677 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
678 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
679 for ($i = 0; $i < 100; $i++) {
680 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
681 }
682 }
683 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
684 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
685 }
686
687
688 // http://gabriel.mp3-tech.org/mp3infotag.html
689 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
690
691 // shortcut
692 $thisfile_mpeg_audio['LAME'] = array();
693 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
694
695
696 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20);
697 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
698
699 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
700
701 // extra 11 chars are not part of version string when LAMEtag present
702 unset($thisfile_mpeg_audio_lame['long_version']);
703
704 // It the LAME tag was only introduced in LAME v3.90
705 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
706
707 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
708 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
709 // MPEG-1 non-mono, but not for other combinations
710 $LAMEtagOffsetContant = $VBRidOffset - 0x24;
711
712 // shortcuts
713 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array());
714 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
715 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
716 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
717 $thisfile_mpeg_audio_lame['raw'] = array();
718 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
719
720 // byte $9B VBR Quality
721 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
722 // Actually overwrites original Xing bytes
723 unset($thisfile_mpeg_audio['VBR_scale']);
724 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));
725
726 // bytes $9C-$A4 Encoder short VersionString
727 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);
728
729 // byte $A5 Info Tag revision + VBR method
730 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));
731
732 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
733 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
734 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
735 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
736
737 // byte $A6 Lowpass filter value
738 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;
739
740 // bytes $A7-$AE Replay Gain
741 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
742 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
743 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
744 // LAME 3.94a16 and later - 9.23 fixed point
745 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
746 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
747 } else {
748 // LAME 3.94a15 and earlier - 32-bit floating point
749 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
750 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
751 }
752 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
753 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
754 } else {
755 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
756 }
757
758 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
759 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));
760
761
762 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
763
764 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
765 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
766 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
767 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
768 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
769 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
770 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
771
772 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
773 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
774 }
775 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
776 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
777 } else {
778 unset($thisfile_mpeg_audio_lame_RGAD['track']);
779 }
780 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
781
782 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
783 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
784 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
785 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
786 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
787 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
788 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
789
790 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
791 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
792 }
793 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
794 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
795 } else {
796 unset($thisfile_mpeg_audio_lame_RGAD['album']);
797 }
798 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
799 unset($thisfile_mpeg_audio_lame['RGAD']);
800 }
801
802
803 // byte $AF Encoding flags + ATH Type
804 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
805 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
806 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
807 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
808 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
809 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
810
811 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
812 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
813 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
814 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
815 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
816 // ignore
817 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
818 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
819 }
820
821 // bytes $B1-$B3 Encoder delays
822 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
823 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
824 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
825
826 // byte $B4 Misc
827 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
828 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
829 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
830 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
831 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
832 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
833 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
834 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
835 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
836
837 // byte $B5 MP3 Gain
838 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
839 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
840 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
841
842 // bytes $B6-$B7 Preset and surround info
843 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
844 // Reserved = ($PresetSurroundBytes & 0xC000);
845 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
846 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
847 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
848 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
849 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
850 $this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
851 }
852 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
853 // this may change if 3.90.4 ever comes out
854 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
855 }
856
857 // bytes $B8-$BB MusicLength
858 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
859 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
860
861 // bytes $BC-$BD MusicCRC
862 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));
863
864 // bytes $BE-$BF CRC-16 of Info Tag
865 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));
866
867
868 // LAME CBR
869 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
870
871 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
872 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
873 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
874 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
875 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
876 //}
877
878 }
879
880 }
881 }
882
883 } else {
884
885 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
886 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
887 if ($recursivesearch) {
888 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
889 if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
890 $recursivesearch = false;
891 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
892 }
893 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
894 $this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
895 }
896 }
897
898 }
899
900 }
901
902 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
903 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
904 if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
905 // ignore, audio data is broken into chunks so will always be data "missing"
906 }
907 elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
908 $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
909 }
910 else {
911 $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
912 }
913 } else {
914 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
915 // $prenullbytefileoffset = $this->ftell();
916 // $this->fseek($info['avdataend']);
917 // $PossibleNullByte = $this->fread(1);
918 // $this->fseek($prenullbytefileoffset);
919 // if ($PossibleNullByte === "\x00") {
920 $info['avdataend']--;
921 // $this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
922 // } else {
923 // $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
924 // }
925 } else {
926 $this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
927 }
928 }
929 }
930
931 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
932 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
933 $framebytelength = $this->FreeFormatFrameLength($offset, true);
934 if ($framebytelength > 0) {
935 $thisfile_mpeg_audio['framelength'] = $framebytelength;
936 if ($thisfile_mpeg_audio['layer'] == '1') {
937 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
938 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
939 } else {
940 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
941 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
942 }
943 } else {
944 $this->error('Error calculating frame length of free-format MP3 without Xing/LAME header');
945 }
946 }
947 }
948
949 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
950 switch ($thisfile_mpeg_audio['bitrate_mode']) {
951 case 'vbr':
952 case 'abr':
953 $bytes_per_frame = 1152;
954 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
955 $bytes_per_frame = 384;
956 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
957 $bytes_per_frame = 576;
958 }
959 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
960 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
961 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
962 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
963 }
964 break;
965 }
966 }
967
968 // End variable-bitrate headers
970
971 if ($recursivesearch) {
972
973 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
974 return false;
975 }
976
977 }
978
979
980 //if (false) {
981 // // experimental side info parsing section - not returning anything useful yet
982 //
983 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
984 // $SideInfoOffset = 0;
985 //
986 // if ($thisfile_mpeg_audio['version'] == '1') {
987 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
988 // // MPEG-1 (mono)
989 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
990 // $SideInfoOffset += 9;
991 // $SideInfoOffset += 5;
992 // } else {
993 // // MPEG-1 (stereo, joint-stereo, dual-channel)
994 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
995 // $SideInfoOffset += 9;
996 // $SideInfoOffset += 3;
997 // }
998 // } else { // 2 or 2.5
999 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1000 // // MPEG-2, MPEG-2.5 (mono)
1001 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1002 // $SideInfoOffset += 8;
1003 // $SideInfoOffset += 1;
1004 // } else {
1005 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
1006 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1007 // $SideInfoOffset += 8;
1008 // $SideInfoOffset += 2;
1009 // }
1010 // }
1011 //
1012 // if ($thisfile_mpeg_audio['version'] == '1') {
1013 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1014 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1015 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1016 // $SideInfoOffset += 2;
1017 // }
1018 // }
1019 // }
1020 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1021 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1022 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1023 // $SideInfoOffset += 12;
1024 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1025 // $SideInfoOffset += 9;
1026 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1027 // $SideInfoOffset += 8;
1028 // if ($thisfile_mpeg_audio['version'] == '1') {
1029 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1030 // $SideInfoOffset += 4;
1031 // } else {
1032 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1033 // $SideInfoOffset += 9;
1034 // }
1035 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1036 // $SideInfoOffset += 1;
1037 //
1038 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1039 //
1040 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1041 // $SideInfoOffset += 2;
1042 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1043 // $SideInfoOffset += 1;
1044 //
1045 // for ($region = 0; $region < 2; $region++) {
1046 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1047 // $SideInfoOffset += 5;
1048 // }
1049 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1050 //
1051 // for ($window = 0; $window < 3; $window++) {
1052 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1053 // $SideInfoOffset += 3;
1054 // }
1055 //
1056 // } else {
1057 //
1058 // for ($region = 0; $region < 3; $region++) {
1059 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1060 // $SideInfoOffset += 5;
1061 // }
1062 //
1063 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1064 // $SideInfoOffset += 4;
1065 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1066 // $SideInfoOffset += 3;
1067 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1068 // }
1069 //
1070 // if ($thisfile_mpeg_audio['version'] == '1') {
1071 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1072 // $SideInfoOffset += 1;
1073 // }
1074 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1075 // $SideInfoOffset += 1;
1076 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1077 // $SideInfoOffset += 1;
1078 // }
1079 // }
1080 //}
1081
1082 return true;
1083 }
getid3_handler\isDependencyFor
isDependencyFor($module)
Definition: getid3.php:1748
getid3_lib\RGADadjustmentLookup
static RGADadjustmentLookup($rawadjustment, $signbit)
Definition: getid3.lib.php:1150
getid3_lib\PrintHexBytes
static PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8')
Definition: getid3.lib.php:18
getid3_lib\RGADamplitude2dB
static RGADamplitude2dB($amplitude)
Definition: getid3.lib.php:1174
getid3_lib\RGADoriginatorLookup
static RGADoriginatorLookup($originatorcode)
Definition: getid3.lib.php:1137
getid3_lib\LittleEndian2Float
static LittleEndian2Float($byteword)
Definition: getid3.lib.php:180
getid3_lib\RGADnameLookup
static RGADnameLookup($namecode)
Definition: getid3.lib.php:1125
getid3_lib\BigEndian2Int
static BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: getid3.lib.php:263
getid3_mp3\MPEGaudioFrameLength
static MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate)
Definition: module.audio.mp3.php:1812
getid3_mp3\MPEGaudioFrequencyArray
static MPEGaudioFrequencyArray()
Definition: module.audio.mp3.php:1665
getid3_mp3\LAMEpresetUsedLookup
static LAMEpresetUsedLookup($LAMEtag)
Definition: module.audio.mp3.php:1969
getid3_mp3\MPEGaudioHeaderValid
static MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false)
Definition: module.audio.mp3.php:1703
getid3_mp3\LAMEmiscStereoModeLookup
static LAMEmiscStereoModeLookup($StereoModeID)
Definition: module.audio.mp3.php:1935
getid3_mp3\RecursiveFrameScanning
RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR)
Definition: module.audio.mp3.php:1085
getid3_mp3\MPEGaudioHeaderDecode
static MPEGaudioHeaderDecode($Header4Bytes)
Definition: module.audio.mp3.php:1775
getid3_mp3\MPEGaudioVersionArray
static MPEGaudioVersionArray()
Definition: module.audio.mp3.php:1636
getid3_mp3\MPEGaudioEmphasisArray
static MPEGaudioEmphasisArray()
Definition: module.audio.mp3.php:1694
getid3_mp3\XingVBRidOffset
static XingVBRidOffset($version, $channelmode)
Definition: module.audio.mp3.php:1893
getid3_mp3\ClosestStandardMP3Bitrate
static ClosestStandardMP3Bitrate($bit_rate)
Definition: module.audio.mp3.php:1873
getid3_mp3\LAMEvbrMethodLookup
static LAMEvbrMethodLookup($VBRmethodID)
Definition: module.audio.mp3.php:1919
getid3_mp3\MPEGaudioModeExtensionArray
static MPEGaudioModeExtensionArray()
Definition: module.audio.mp3.php:1682
getid3_mp3\LAMEmiscSourceSampleFrequencyLookup
static LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID)
Definition: module.audio.mp3.php:1949
getid3_mp3\MPEGaudioChannelModeArray
static MPEGaudioChannelModeArray()
Definition: module.audio.mp3.php:1677
getid3_mp3\MPEGaudioLayerArray
static MPEGaudioLayerArray()
Definition: module.audio.mp3.php:1641
getid3_mp3\LAMEsurroundInfoLookup
static LAMEsurroundInfoLookup($SurroundInfoID)
Definition: module.audio.mp3.php:1959
getid3_mp3\FreeFormatFrameLength
FreeFormatFrameLength($offset, $deepscan=false)
Definition: module.audio.mp3.php:1131
getid3_mp3\MPEGaudioBitrateArray
static MPEGaudioBitrateArray()
Definition: module.audio.mp3.php:1646
$i
$i
Definition: disco.tpl.php:19

References $i, $info, getid3_lib\BigEndian2Int(), ClosestStandardMP3Bitrate(), getid3_handler\error(), getid3_handler\fread(), FreeFormatFrameLength(), getid3_handler\fseek(), getid3_handler\isDependencyFor(), LAMEmiscSourceSampleFrequencyLookup(), LAMEmiscStereoModeLookup(), LAMEpresetUsedLookup(), LAMEsurroundInfoLookup(), LAMEvbrMethodLookup(), getid3_lib\LittleEndian2Float(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), MPEGaudioVersionArray(), getid3_lib\PrintHexBytes(), RecursiveFrameScanning(), getid3_lib\RGADadjustmentLookup(), getid3_lib\RGADamplitude2dB(), getid3_lib\RGADnameLookup(), getid3_lib\RGADoriginatorLookup(), getid3_handler\warning(), and XingVBRidOffset().

Referenced by getOnlyMPEGaudioInfo(), and RecursiveFrameScanning().

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◆ FreeFormatFrameLength()

getid3_mp3::FreeFormatFrameLength (   $offset,
  $deepscan = false 
)

Definition at line 1131 of file module.audio.mp3.php.

1131 {
1132 $info = &$this->getid3->info;
1133
1134 $this->fseek($offset);
1135 $MPEGaudioData = $this->fread(32768);
1136
1137 $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1138 // may be different pattern due to padding
1139 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3};
1140 if ($SyncPattern2 === $SyncPattern1) {
1141 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3};
1142 }
1143
1144 $framelength = false;
1145 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1146 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1147 if ($framelength1 > 4) {
1148 $framelength = $framelength1;
1149 }
1150 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1151 $framelength = $framelength2;
1152 }
1153 if (!$framelength) {
1154
1155 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1156 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4);
1157 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4);
1158
1159 if ($framelength1 > 4) {
1160 $framelength = $framelength1;
1161 }
1162 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1163 $framelength = $framelength2;
1164 }
1165 if (!$framelength) {
1166 $this->error('Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset);
1167 return false;
1168 } else {
1169 $this->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)');
1170 $info['audio']['codec'] = 'LAME';
1171 $info['audio']['encoder'] = 'LAME3.88';
1172 $SyncPattern1 = substr($SyncPattern1, 0, 3);
1173 $SyncPattern2 = substr($SyncPattern2, 0, 3);
1174 }
1175 }
1176
1177 if ($deepscan) {
1178
1179 $ActualFrameLengthValues = array();
1180 $nextoffset = $offset + $framelength;
1181 while ($nextoffset < ($info['avdataend'] - 6)) {
1182 $this->fseek($nextoffset - 1);
1183 $NextSyncPattern = $this->fread(6);
1184 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) {
1185 // good - found where expected
1186 $ActualFrameLengthValues[] = $framelength;
1187 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) {
1188 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1189 $ActualFrameLengthValues[] = ($framelength - 1);
1190 $nextoffset--;
1191 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) {
1192 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1193 $ActualFrameLengthValues[] = ($framelength + 1);
1194 $nextoffset++;
1195 } else {
1196 $this->error('Did not find expected free-format sync pattern at offset '.$nextoffset);
1197 return false;
1198 }
1199 $nextoffset += $framelength;
1200 }
1201 if (count($ActualFrameLengthValues) > 0) {
1202 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1203 }
1204 }
1205 return $framelength;
1206 }

References $info, getid3_handler\error(), getid3_handler\fread(), getid3_handler\fseek(), getid3_lib\PrintHexBytes(), and getid3_handler\warning().

Referenced by decodeMPEGaudioHeader().

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◆ getOnlyMPEGaudioInfo()

getid3_mp3::getOnlyMPEGaudioInfo (   $avdataoffset,
  $BitrateHistogram = false 
)

Definition at line 1356 of file module.audio.mp3.php.

1356 {
1357 // looks for synch, decodes MPEG audio header
1358
1359 $info = &$this->getid3->info;
1360
1361 static $MPEGaudioVersionLookup;
1362 static $MPEGaudioLayerLookup;
1363 static $MPEGaudioBitrateLookup;
1364 if (empty($MPEGaudioVersionLookup)) {
1365 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1366 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1367 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1368
1369 }
1370
1371 $this->fseek($avdataoffset);
1372 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset);
1373 if ($sync_seek_buffer_size <= 0) {
1374 $this->error('Invalid $sync_seek_buffer_size at offset '.$avdataoffset);
1375 return false;
1376 }
1377 $header = $this->fread($sync_seek_buffer_size);
1378 $sync_seek_buffer_size = strlen($header);
1379 $SynchSeekOffset = 0;
1380 while ($SynchSeekOffset < $sync_seek_buffer_size) {
1381 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
1382
1383 if ($SynchSeekOffset > $sync_seek_buffer_size) {
1384 // if a synch's not found within the first 128k bytes, then give up
1385 $this->error('Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB');
1386 if (isset($info['audio']['bitrate'])) {
1387 unset($info['audio']['bitrate']);
1388 }
1389 if (isset($info['mpeg']['audio'])) {
1390 unset($info['mpeg']['audio']);
1391 }
1392 if (empty($info['mpeg'])) {
1393 unset($info['mpeg']);
1394 }
1395 return false;
1396
1397 } elseif (feof($this->getid3->fp)) {
1398
1399 $this->error('Could not find valid MPEG audio synch before end of file');
1400 if (isset($info['audio']['bitrate'])) {
1401 unset($info['audio']['bitrate']);
1402 }
1403 if (isset($info['mpeg']['audio'])) {
1404 unset($info['mpeg']['audio']);
1405 }
1406 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
1407 unset($info['mpeg']);
1408 }
1409 return false;
1410 }
1411 }
1412
1413 if (($SynchSeekOffset + 1) >= strlen($header)) {
1414 $this->error('Could not find valid MPEG synch before end of file');
1415 return false;
1416 }
1417
1418 if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
1419 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1420 $FirstFrameThisfileInfo = $info;
1421 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1422 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) {
1423 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1424 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1425 unset($FirstFrameThisfileInfo);
1426 }
1427 }
1428
1429 $dummy = $info; // only overwrite real data if valid header found
1430 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) {
1431 $info = $dummy;
1432 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1433 switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1434 case '':
1435 case 'id3':
1436 case 'ape':
1437 case 'mp3':
1438 $info['fileformat'] = 'mp3';
1439 $info['audio']['dataformat'] = 'mp3';
1440 break;
1441 }
1442 if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1443 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1444 // If there is garbage data between a valid VBR header frame and a sequence
1445 // of valid MPEG-audio frames the VBR data is no longer discarded.
1446 $info = $FirstFrameThisfileInfo;
1447 $info['avdataoffset'] = $FirstFrameAVDataOffset;
1448 $info['fileformat'] = 'mp3';
1449 $info['audio']['dataformat'] = 'mp3';
1450 $dummy = $info;
1451 unset($dummy['mpeg']['audio']);
1452 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1453 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1454 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) {
1455 $info = $dummy;
1456 $info['avdataoffset'] = $GarbageOffsetEnd;
1457 $this->warning('apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd);
1458 } else {
1459 $this->warning('using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')');
1460 }
1461 }
1462 }
1463 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1464 // VBR file with no VBR header
1465 $BitrateHistogram = true;
1466 }
1467
1468 if ($BitrateHistogram) {
1469
1470 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0);
1471 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0);
1472
1473 if ($info['mpeg']['audio']['version'] == '1') {
1474 if ($info['mpeg']['audio']['layer'] == 3) {
1475 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0);
1476 } elseif ($info['mpeg']['audio']['layer'] == 2) {
1477 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0);
1478 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1479 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0);
1480 }
1481 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1482 $info['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);
1483 } else {
1484 $info['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);
1485 }
1486
1487 $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1488 $synchstartoffset = $info['avdataoffset'];
1489 $this->fseek($info['avdataoffset']);
1490
1491 // you can play with these numbers:
1492 $max_frames_scan = 50000;
1493 $max_scan_segments = 10;
1494
1495 // don't play with these numbers:
1496 $FastMode = false;
1497 $SynchErrorsFound = 0;
1498 $frames_scanned = 0;
1499 $this_scan_segment = 0;
1500 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1501 $pct_data_scanned = 0;
1502 for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) {
1503 $frames_scanned_this_segment = 0;
1504 if ($this->ftell() >= $info['avdataend']) {
1505 break;
1506 }
1507 $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1508 if ($current_segment > 0) {
1509 $this->fseek($scan_start_offset[$current_segment]);
1510 $buffer_4k = $this->fread(4096);
1511 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1512 if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
1513 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) {
1514 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1515 if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) {
1516 $scan_start_offset[$current_segment] += $j;
1517 break;
1518 }
1519 }
1520 }
1521 }
1522 }
1523 $synchstartoffset = $scan_start_offset[$current_segment];
1524 while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) {
1525 $FastMode = true;
1526 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1527
1528 if (empty($dummy['mpeg']['audio']['framelength'])) {
1529 $SynchErrorsFound++;
1530 $synchstartoffset++;
1531 } else {
1532 getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1533 getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1534 getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1535 $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1536 }
1537 $frames_scanned++;
1538 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1539 $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
1540 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1541 // file likely contains < $max_frames_scan, just scan as one segment
1542 $max_scan_segments = 1;
1543 $frames_scan_per_segment = $max_frames_scan;
1544 } else {
1545 $pct_data_scanned += $this_pct_scanned;
1546 break;
1547 }
1548 }
1549 }
1550 }
1551 if ($pct_data_scanned > 0) {
1552 $this->warning('too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
1553 foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1554 if (!preg_match('#_distribution$#i', $key1)) {
1555 continue;
1556 }
1557 foreach ($value1 as $key2 => $value2) {
1558 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1559 }
1560 }
1561 }
1562
1563 if ($SynchErrorsFound > 0) {
1564 $this->warning('Found '.$SynchErrorsFound.' synch errors in histogram analysis');
1565 //return false;
1566 }
1567
1568 $bittotal = 0;
1569 $framecounter = 0;
1570 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1571 $framecounter += $bitratecount;
1572 if ($bitratevalue != 'free') {
1573 $bittotal += ($bitratevalue * $bitratecount);
1574 }
1575 }
1576 if ($framecounter == 0) {
1577 $this->error('Corrupt MP3 file: framecounter == zero');
1578 return false;
1579 }
1580 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter);
1581 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1582
1583 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1584
1585
1586 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1587 $distinct_bitrates = 0;
1588 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1589 if ($bitrate_count > 0) {
1590 $distinct_bitrates++;
1591 }
1592 }
1593 if ($distinct_bitrates > 1) {
1594 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1595 } else {
1596 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1597 }
1598 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1599
1600 }
1601
1602 break; // exit while()
1603 }
1604 }
1605
1606 $SynchSeekOffset++;
1607 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1608 // end of file/data
1609
1610 if (empty($info['mpeg']['audio'])) {
1611
1612 $this->error('could not find valid MPEG synch before end of file');
1613 if (isset($info['audio']['bitrate'])) {
1614 unset($info['audio']['bitrate']);
1615 }
1616 if (isset($info['mpeg']['audio'])) {
1617 unset($info['mpeg']['audio']);
1618 }
1619 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1620 unset($info['mpeg']);
1621 }
1622 return false;
1623
1624 }
1625 break;
1626 }
1627
1628 }
1629 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1630 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1631 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1632 return true;
1633 }
getid3_handler\ftell
ftell()
Definition: getid3.php:1676
getid3_handler\feof
feof()
Definition: getid3.php:1741
getid3_lib\safe_inc
static safe_inc(&$variable, $increment=1)
Definition: getid3.lib.php:56
getid3_lib\CastAsInt
static CastAsInt($floatnum)
Definition: getid3.lib.php:65
getid3_mp3\decodeMPEGaudioHeader
decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
Definition: module.audio.mp3.php:408
GETID3_MP3_VALID_CHECK_FRAMES
const GETID3_MP3_VALID_CHECK_FRAMES
getID3() by James Heinrich info@getid3.org //
Definition: module.audio.mp3.php:22
$header
$header
Definition: no_cookie.tpl.php:6

References $header, $info, getid3_lib\CastAsInt(), decodeMPEGaudioHeader(), getid3_handler\error(), getid3_handler\feof(), getid3_handler\fread(), getid3_handler\fseek(), getid3_handler\ftell(), GETID3_MP3_VALID_CHECK_FRAMES, MPEGaudioBitrateArray(), MPEGaudioLayerArray(), MPEGaudioVersionArray(), getid3_lib\safe_inc(), and getid3_handler\warning().

Referenced by Analyze().

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◆ getOnlyMPEGaudioInfoBruteForce()

getid3_mp3::getOnlyMPEGaudioInfoBruteForce ( )

Definition at line 1208 of file module.audio.mp3.php.

1208 {
1209 $MPEGaudioHeaderDecodeCache = array();
1210 $MPEGaudioHeaderValidCache = array();
1211 $MPEGaudioHeaderLengthCache = array();
1212 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1213 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1214 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1215 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1216 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1217 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1218 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1219 $LongMPEGversionLookup = array();
1220 $LongMPEGlayerLookup = array();
1221 $LongMPEGbitrateLookup = array();
1222 $LongMPEGpaddingLookup = array();
1223 $LongMPEGfrequencyLookup = array();
1224 $Distribution['bitrate'] = array();
1225 $Distribution['frequency'] = array();
1226 $Distribution['layer'] = array();
1227 $Distribution['version'] = array();
1228 $Distribution['padding'] = array();
1229
1230 $info = &$this->getid3->info;
1231 $this->fseek($info['avdataoffset']);
1232
1233 $max_frames_scan = 5000;
1234 $frames_scanned = 0;
1235
1236 $previousvalidframe = $info['avdataoffset'];
1237 while ($this->ftell() < $info['avdataend']) {
1238 set_time_limit(30);
1239 $head4 = $this->fread(4);
1240 if (strlen($head4) < 4) {
1241 break;
1242 }
1243 if ($head4{0} != "\xFF") {
1244 for ($i = 1; $i < 4; $i++) {
1245 if ($head4{$i} == "\xFF") {
1246 $this->fseek($i - 4, SEEK_CUR);
1247 continue 2;
1248 }
1249 }
1250 continue;
1251 }
1252 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1253 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1254 }
1255 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1256 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
1257 }
1258 if ($MPEGaudioHeaderValidCache[$head4]) {
1259
1260 if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1261 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1262 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1263 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1264 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1265 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1266 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1267 $LongMPEGbitrateLookup[$head4],
1268 $LongMPEGversionLookup[$head4],
1269 $LongMPEGlayerLookup[$head4],
1270 $LongMPEGpaddingLookup[$head4],
1271 $LongMPEGfrequencyLookup[$head4]);
1272 }
1273 if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1274 $WhereWeWere = $this->ftell();
1275 $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1276 $next4 = $this->fread(4);
1277 if ($next4{0} == "\xFF") {
1278 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1279 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1280 }
1281 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1282 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
1283 }
1284 if ($MPEGaudioHeaderValidCache[$next4]) {
1285 $this->fseek(-4, SEEK_CUR);
1286
1287 getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
1288 getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
1289 getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
1290 getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
1291 getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
1292 if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
1293 $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
1294 $this->warning('too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.');
1295 foreach ($Distribution as $key1 => $value1) {
1296 foreach ($value1 as $key2 => $value2) {
1297 $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1298 }
1299 }
1300 break;
1301 }
1302 continue;
1303 }
1304 }
1305 unset($next4);
1306 $this->fseek($WhereWeWere - 3);
1307 }
1308
1309 }
1310 }
1311 foreach ($Distribution as $key => $value) {
1312 ksort($Distribution[$key], SORT_NUMERIC);
1313 }
1314 ksort($Distribution['version'], SORT_STRING);
1315 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1316 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1317 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1318 $info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1319 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1320 if (count($Distribution['version']) > 1) {
1321 $this->error('Corrupt file - more than one MPEG version detected');
1322 }
1323 if (count($Distribution['layer']) > 1) {
1324 $this->error('Corrupt file - more than one MPEG layer detected');
1325 }
1326 if (count($Distribution['frequency']) > 1) {
1327 $this->error('Corrupt file - more than one MPEG sample rate detected');
1328 }
1329
1330
1331 $bittotal = 0;
1332 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1333 if ($bitratevalue != 'free') {
1334 $bittotal += ($bitratevalue * $bitratecount);
1335 }
1336 }
1337 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1338 if ($info['mpeg']['audio']['frame_count'] == 0) {
1339 $this->error('no MPEG audio frames found');
1340 return false;
1341 }
1342 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
1343 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1344 $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true);
1345
1346 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1347 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1348 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1349 $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
1350 $info['fileformat'] = $info['audio']['dataformat'];
1351
1352 return true;
1353 }
getid3_lib\array_max
static array_max($arraydata, $returnkey=false)
Definition: getid3.lib.php:507
$key
$key
Definition: croninfo.php:18

References $i, $info, $key, getid3_lib\array_max(), getid3_handler\error(), getid3_handler\fread(), getid3_handler\fseek(), getid3_handler\ftell(), MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrameLength(), MPEGaudioFrequencyArray(), MPEGaudioHeaderDecode(), MPEGaudioHeaderValid(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), MPEGaudioVersionArray(), getid3_lib\safe_inc(), and getid3_handler\warning().

Referenced by Analyze().

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◆ GuessEncoderOptions()

getid3_mp3::GuessEncoderOptions ( )

Definition at line 164 of file module.audio.mp3.php.

164 {
165 // shortcuts
166 $info = &$this->getid3->info;
167 if (!empty($info['mpeg']['audio'])) {
168 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
169 if (!empty($thisfile_mpeg_audio['LAME'])) {
170 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
171 }
172 }
173
174 $encoder_options = '';
175 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
176
177 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
178
179 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality'];
180
181 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) {
182
183 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
184
185 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
186
187 static $KnownEncoderValues = array();
188 if (empty($KnownEncoderValues)) {
189
190 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
191 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
192 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
193 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
194 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
195 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
196 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
197 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
198 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
199 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
200 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
201 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
202 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
203 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
204 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
205 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
206 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
207 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
208
209 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
210 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
211 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
212 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
213 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
214 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
215 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
216 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
217 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
218 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
219 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
220 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
221 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
222 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
223 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
224 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
225 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
226 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
227 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
228 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
229 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
230 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
231 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
232 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
233 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
234 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
235 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
236 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
237 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
238 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
239 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
240 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
241 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
242 }
243
244 if (isset($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']])) {
245
246 $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']];
247
248 } 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']])) {
249
250 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
251
252 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
253
254 // http://gabriel.mp3-tech.org/mp3infotag.html
255 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
256
257
258 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
259 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
260 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value;
261
262 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
263
264 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
265
266 } else {
267
268 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
269
270 }
271
272 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
273
274 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr'];
275
276 } elseif (!empty($info['audio']['bitrate'])) {
277
278 if ($info['audio']['bitrate_mode'] == 'cbr') {
279 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
280 } else {
281 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
282 }
283
284 }
285 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
286 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min'];
287 }
288
289 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
290 $encoder_options .= ' --nogap';
291 }
292
293 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
294 $ExplodedOptions = explode(' ', $encoder_options, 4);
295 if ($ExplodedOptions[0] == '--r3mix') {
296 $ExplodedOptions[1] = 'r3mix';
297 }
298 switch ($ExplodedOptions[0]) {
299 case '--preset':
300 case '--alt-preset':
301 case '--r3mix':
302 if ($ExplodedOptions[1] == 'fast') {
303 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2];
304 }
305 switch ($ExplodedOptions[1]) {
306 case 'portable':
307 case 'medium':
308 case 'standard':
309 case 'extreme':
310 case 'insane':
311 case 'fast portable':
312 case 'fast medium':
313 case 'fast standard':
314 case 'fast extreme':
315 case 'fast insane':
316 case 'r3mix':
317 static $ExpectedLowpass = array(
318 'insane|20500' => 20500,
319 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
320 'medium|18000' => 18000,
321 'fast medium|18000' => 18000,
322 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
323 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
324 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
325 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
326 'standard|19000' => 19000,
327 'fast standard|19000' => 19000,
328 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
329 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
330 'r3mix|18000' => 18000, // 3.94, 3.95
331 );
332 if (!isset($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))) {
333 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency'];
334 }
335 break;
336
337 default:
338 break;
339 }
340 break;
341 }
342 }
343
344 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
345 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
346 $encoder_options .= ' --resample 44100';
347 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
348 $encoder_options .= ' --resample 48000';
349 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
350 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
351 case 0: // <= 32000
352 // may or may not be same as source frequency - ignore
353 break;
354 case 1: // 44100
355 case 2: // 48000
356 case 3: // 48000+
357 $ExplodedOptions = explode(' ', $encoder_options, 4);
358 switch ($ExplodedOptions[0]) {
359 case '--preset':
360 case '--alt-preset':
361 switch ($ExplodedOptions[1]) {
362 case 'fast':
363 case 'portable':
364 case 'medium':
365 case 'standard':
366 case 'extreme':
367 case 'insane':
368 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
369 break;
370
371 default:
372 static $ExpectedResampledRate = array(
373 'phon+/lw/mw-eu/sw|16000' => 16000,
374 'mw-us|24000' => 24000, // 3.95
375 'mw-us|32000' => 32000, // 3.93
376 'mw-us|16000' => 16000, // 3.92
377 'phone|16000' => 16000,
378 'phone|11025' => 11025, // 3.94a15
379 'radio|32000' => 32000, // 3.94a15
380 'fm/radio|32000' => 32000, // 3.92
381 'fm|32000' => 32000, // 3.90
382 'voice|32000' => 32000);
383 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) {
384 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
385 }
386 break;
387 }
388 break;
389
390 case '--r3mix':
391 default:
392 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate'];
393 break;
394 }
395 break;
396 }
397 }
398 }
399 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
400 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
401 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
402 }
403
404 return $encoder_options;
405 }

References $info.

Referenced by Analyze().

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◆ LAMEmiscSourceSampleFrequencyLookup()

static getid3_mp3::LAMEmiscSourceSampleFrequencyLookup (   $SourceSampleFrequencyID)
static

Definition at line 1949 of file module.audio.mp3.php.

1949 {
1950 static $LAMEmiscSourceSampleFrequencyLookup = array(
1951 0 => '<= 32 kHz',
1952 1 => '44.1 kHz',
1953 2 => '48 kHz',
1954 3 => '> 48kHz'
1955 );
1956 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
1957 }

Referenced by decodeMPEGaudioHeader().

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◆ LAMEmiscStereoModeLookup()

static getid3_mp3::LAMEmiscStereoModeLookup (   $StereoModeID)
static

Definition at line 1935 of file module.audio.mp3.php.

1935 {
1936 static $LAMEmiscStereoModeLookup = array(
1937 0 => 'mono',
1938 1 => 'stereo',
1939 2 => 'dual mono',
1940 3 => 'joint stereo',
1941 4 => 'forced stereo',
1942 5 => 'auto',
1943 6 => 'intensity stereo',
1944 7 => 'other'
1945 );
1946 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
1947 }

Referenced by decodeMPEGaudioHeader().

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◆ LAMEpresetUsedLookup()

static getid3_mp3::LAMEpresetUsedLookup (   $LAMEtag)
static

Definition at line 1969 of file module.audio.mp3.php.

1969 {
1970
1971 if ($LAMEtag['preset_used_id'] == 0) {
1972 // no preset used (LAME >=3.93)
1973 // no preset recorded (LAME <3.93)
1974 return '';
1975 }
1976 $LAMEpresetUsedLookup = array();
1977
1979 for ($i = 8; $i <= 320; $i++) {
1980 switch ($LAMEtag['vbr_method']) {
1981 case 'cbr':
1982 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;
1983 break;
1984 case 'abr':
1985 default: // other VBR modes shouldn't be here(?)
1986 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;
1987 break;
1988 }
1989 }
1990
1991 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
1992
1993 // named alt-presets
1994 $LAMEpresetUsedLookup[1000] = '--r3mix';
1995 $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
1996 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
1997 $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
1998 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
1999 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
2000 $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
2001 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2002
2003 // LAME 3.94 additions/changes
2004 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
2005 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
2006
2007 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
2008 $LAMEpresetUsedLookup[410] = '-V9';
2009 $LAMEpresetUsedLookup[420] = '-V8';
2010 $LAMEpresetUsedLookup[440] = '-V6';
2011 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
2012 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003
2013 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003
2014 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2015 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003
2016 $LAMEpresetUsedLookup[490] = '-V1';
2017 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003
2018
2019 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org');
2020 }

References $i.

Referenced by decodeMPEGaudioHeader().

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◆ LAMEsurroundInfoLookup()

static getid3_mp3::LAMEsurroundInfoLookup (   $SurroundInfoID)
static

Definition at line 1959 of file module.audio.mp3.php.

1959 {
1960 static $LAMEsurroundInfoLookup = array(
1961 0 => 'no surround info',
1962 1 => 'DPL encoding',
1963 2 => 'DPL2 encoding',
1964 3 => 'Ambisonic encoding'
1965 );
1966 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
1967 }

Referenced by decodeMPEGaudioHeader().

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◆ LAMEvbrMethodLookup()

static getid3_mp3::LAMEvbrMethodLookup (   $VBRmethodID)
static

Definition at line 1919 of file module.audio.mp3.php.

1919 {
1920 static $LAMEvbrMethodLookup = array(
1921 0x00 => 'unknown',
1922 0x01 => 'cbr',
1923 0x02 => 'abr',
1924 0x03 => 'vbr-old / vbr-rh',
1925 0x04 => 'vbr-new / vbr-mtrh',
1926 0x05 => 'vbr-mt',
1927 0x06 => 'vbr (full vbr method 4)',
1928 0x08 => 'cbr (constant bitrate 2 pass)',
1929 0x09 => 'abr (2 pass)',
1930 0x0F => 'reserved'
1931 );
1932 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
1933 }

Referenced by decodeMPEGaudioHeader().

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◆ MPEGaudioBitrateArray()

static getid3_mp3::MPEGaudioBitrateArray ( )
static

Definition at line 1646 of file module.audio.mp3.php.

1646 {
1647 static $MPEGaudioBitrate;
1648 if (empty($MPEGaudioBitrate)) {
1649 $MPEGaudioBitrate = array (
1650 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1651 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1652 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1653 ),
1654
1655 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1656 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1657 )
1658 );
1659 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1660 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1661 }
1662 return $MPEGaudioBitrate;
1663 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioChannelModeArray()

static getid3_mp3::MPEGaudioChannelModeArray ( )
static

Definition at line 1677 of file module.audio.mp3.php.

1677 {
1678 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1679 return $MPEGaudioChannelMode;
1680 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioEmphasisArray()

static getid3_mp3::MPEGaudioEmphasisArray ( )
static

Definition at line 1694 of file module.audio.mp3.php.

1694 {
1695 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1696 return $MPEGaudioEmphasis;
1697 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioFrameLength()

static getid3_mp3::MPEGaudioFrameLength ( &  $bitrate,
&  $version,
&  $layer,
  $padding,
&  $samplerate 
)
static

Definition at line 1812 of file module.audio.mp3.php.

1812 {
1813 static $AudioFrameLengthCache = array();
1814
1815 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
1816 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
1817 if ($bitrate != 'free') {
1818
1819 if ($version == '1') {
1820
1821 if ($layer == '1') {
1822
1823 // For Layer I slot is 32 bits long
1824 $FrameLengthCoefficient = 48;
1825 $SlotLength = 4;
1826
1827 } else { // Layer 2 / 3
1828
1829 // for Layer 2 and Layer 3 slot is 8 bits long.
1830 $FrameLengthCoefficient = 144;
1831 $SlotLength = 1;
1832
1833 }
1834
1835 } else { // MPEG-2 / MPEG-2.5
1836
1837 if ($layer == '1') {
1838
1839 // For Layer I slot is 32 bits long
1840 $FrameLengthCoefficient = 24;
1841 $SlotLength = 4;
1842
1843 } elseif ($layer == '2') {
1844
1845 // for Layer 2 and Layer 3 slot is 8 bits long.
1846 $FrameLengthCoefficient = 144;
1847 $SlotLength = 1;
1848
1849 } else { // layer 3
1850
1851 // for Layer 2 and Layer 3 slot is 8 bits long.
1852 $FrameLengthCoefficient = 72;
1853 $SlotLength = 1;
1854
1855 }
1856
1857 }
1858
1859 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
1860 if ($samplerate > 0) {
1861 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
1862 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
1863 if ($padding) {
1864 $NewFramelength += $SlotLength;
1865 }
1866 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
1867 }
1868 }
1869 }
1870 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
1871 }

References $version.

Referenced by decodeMPEGaudioHeader(), and getOnlyMPEGaudioInfoBruteForce().

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◆ MPEGaudioFrequencyArray()

static getid3_mp3::MPEGaudioFrequencyArray ( )
static

Definition at line 1665 of file module.audio.mp3.php.

1665 {
1666 static $MPEGaudioFrequency;
1667 if (empty($MPEGaudioFrequency)) {
1668 $MPEGaudioFrequency = array (
1669 '1' => array(44100, 48000, 32000),
1670 '2' => array(22050, 24000, 16000),
1671 '2.5' => array(11025, 12000, 8000)
1672 );
1673 }
1674 return $MPEGaudioFrequency;
1675 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioHeaderBytesValid()

static getid3_mp3::MPEGaudioHeaderBytesValid (   $head4,
  $allowBitrate15 = false 
)
static

Definition at line 1699 of file module.audio.mp3.php.

1699 {
1700 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15);
1701 }

References MPEGaudioHeaderValid().

Referenced by getid3_riff\ParseRIFF().

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◆ MPEGaudioHeaderDecode()

static getid3_mp3::MPEGaudioHeaderDecode (   $Header4Bytes)
static

Definition at line 1775 of file module.audio.mp3.php.

1775 {
1776 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
1777 // A - Frame sync (all bits set)
1778 // B - MPEG Audio version ID
1779 // C - Layer description
1780 // D - Protection bit
1781 // E - Bitrate index
1782 // F - Sampling rate frequency index
1783 // G - Padding bit
1784 // H - Private bit
1785 // I - Channel Mode
1786 // J - Mode extension (Only if Joint stereo)
1787 // K - Copyright
1788 // L - Original
1789 // M - Emphasis
1790
1791 if (strlen($Header4Bytes) != 4) {
1792 return false;
1793 }
1794
1795 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4;
1796 $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
1797 $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
1798 $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
1799 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
1800 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
1801 $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
1802 $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
1803 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
1804 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
1805 $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
1806 $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
1807 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
1808
1809 return $MPEGrawHeader;
1810 }

References getid3_lib\BigEndian2Int().

Referenced by decodeMPEGaudioHeader(), and getOnlyMPEGaudioInfoBruteForce().

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◆ MPEGaudioHeaderValid()

static getid3_mp3::MPEGaudioHeaderValid (   $rawarray,
  $echoerrors = false,
  $allowBitrate15 = false 
)
static

Definition at line 1703 of file module.audio.mp3.php.

1703 {
1704 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1705 return false;
1706 }
1707
1708 static $MPEGaudioVersionLookup;
1709 static $MPEGaudioLayerLookup;
1710 static $MPEGaudioBitrateLookup;
1711 static $MPEGaudioFrequencyLookup;
1712 static $MPEGaudioChannelModeLookup;
1713 static $MPEGaudioModeExtensionLookup;
1714 static $MPEGaudioEmphasisLookup;
1715 if (empty($MPEGaudioVersionLookup)) {
1716 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1717 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1718 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1719 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1720 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1721 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1722 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1723 }
1724
1725 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1726 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1727 } else {
1728 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : '');
1729 return false;
1730 }
1731 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1732 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1733 } else {
1734 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : '');
1735 return false;
1736 }
1737 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1738 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : '');
1739 if ($rawarray['bitrate'] == 15) {
1740 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1741 // let it go through here otherwise file will not be identified
1742 if (!$allowBitrate15) {
1743 return false;
1744 }
1745 } else {
1746 return false;
1747 }
1748 }
1749 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
1750 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : '');
1751 return false;
1752 }
1753 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
1754 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : '');
1755 return false;
1756 }
1757 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
1758 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : '');
1759 return false;
1760 }
1761 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
1762 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : '');
1763 return false;
1764 }
1765 // These are just either set or not set, you can't mess that up :)
1766 // $rawarray['protection'];
1767 // $rawarray['padding'];
1768 // $rawarray['private'];
1769 // $rawarray['copyright'];
1770 // $rawarray['original'];
1771
1772 return true;
1773 }

References MPEGaudioBitrateArray(), MPEGaudioChannelModeArray(), MPEGaudioEmphasisArray(), MPEGaudioFrequencyArray(), MPEGaudioLayerArray(), MPEGaudioModeExtensionArray(), and MPEGaudioVersionArray().

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderBytesValid().

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◆ MPEGaudioLayerArray()

static getid3_mp3::MPEGaudioLayerArray ( )
static

Definition at line 1641 of file module.audio.mp3.php.

1641 {
1642 static $MPEGaudioLayer = array(false, 3, 2, 1);
1643 return $MPEGaudioLayer;
1644 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioModeExtensionArray()

static getid3_mp3::MPEGaudioModeExtensionArray ( )
static

Definition at line 1682 of file module.audio.mp3.php.

1682 {
1683 static $MPEGaudioModeExtension;
1684 if (empty($MPEGaudioModeExtension)) {
1685 $MPEGaudioModeExtension = array (
1686 1 => array('4-31', '8-31', '12-31', '16-31'),
1687 2 => array('4-31', '8-31', '12-31', '16-31'),
1688 3 => array('', 'IS', 'MS', 'IS+MS')
1689 );
1690 }
1691 return $MPEGaudioModeExtension;
1692 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ MPEGaudioVersionArray()

static getid3_mp3::MPEGaudioVersionArray ( )
static

Definition at line 1636 of file module.audio.mp3.php.

1636 {
1637 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1638 return $MPEGaudioVersion;
1639 }

Referenced by decodeMPEGaudioHeader(), getOnlyMPEGaudioInfo(), getOnlyMPEGaudioInfoBruteForce(), and MPEGaudioHeaderValid().

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◆ RecursiveFrameScanning()

getid3_mp3::RecursiveFrameScanning ( &  $offset,
&  $nextframetestoffset,
  $ScanAsCBR 
)

Definition at line 1085 of file module.audio.mp3.php.

1085 {
1086 $info = &$this->getid3->info;
1087 $firstframetestarray = array('error' => array(), 'warning'=> array(), 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1088 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1089
1090 for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1091 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1092 if (($nextframetestoffset + 4) >= $info['avdataend']) {
1093 // end of file
1094 return true;
1095 }
1096
1097 $nextframetestarray = array('error' => array(), 'warning' => array(), 'avdataend' => $info['avdataend'], 'avdataoffset'=>$info['avdataoffset']);
1098 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) {
1099 if ($ScanAsCBR) {
1100 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1101 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1102 return false;
1103 }
1104 }
1105
1106
1107 // next frame is OK, get ready to check the one after that
1108 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1109 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1110 } else {
1111 $this->error('Frame at offset ('.$offset.') is has an invalid frame length.');
1112 return false;
1113 }
1114
1115 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1116
1117 // it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK
1118 return true;
1119
1120 } else {
1121
1122 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1123 $this->warning('Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.');
1124
1125 return false;
1126 }
1127 }
1128 return true;
1129 }

References $i, $info, decodeMPEGaudioHeader(), getid3_handler\error(), GETID3_MP3_VALID_CHECK_FRAMES, and getid3_handler\warning().

Referenced by decodeMPEGaudioHeader().

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◆ XingVBRidOffset()

static getid3_mp3::XingVBRidOffset (   $version,
  $channelmode 
)
static

Definition at line 1893 of file module.audio.mp3.php.

1893 {
1894 static $XingVBRidOffsetCache = array();
1895 if (empty($XingVBRidOffset)) {
1896 $XingVBRidOffset = array (
1897 '1' => array ('mono' => 0x15, // 4 + 17 = 21
1898 'stereo' => 0x24, // 4 + 32 = 36
1899 'joint stereo' => 0x24,
1900 'dual channel' => 0x24
1901 ),
1902
1903 '2' => array ('mono' => 0x0D, // 4 + 9 = 13
1904 'stereo' => 0x15, // 4 + 17 = 21
1905 'joint stereo' => 0x15,
1906 'dual channel' => 0x15
1907 ),
1908
1909 '2.5' => array ('mono' => 0x15,
1910 'stereo' => 0x15,
1911 'joint stereo' => 0x15,
1912 'dual channel' => 0x15
1913 )
1914 );
1915 }
1916 return $XingVBRidOffset[$version][$channelmode];
1917 }

References $version.

Referenced by decodeMPEGaudioHeader().

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Field Documentation

◆ $allow_bruteforce

getid3_mp3::$allow_bruteforce = false

Definition at line 28 of file module.audio.mp3.php.

The documentation for this class was generated from the following file: