ILIAS  release_5-2 Revision v5.2.25-18-g3f80b828510
Public Member Functions | Static Public Member Functions | Data Fields
GetId3\Module\Audio\Mp3 Class Reference

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //. More...

+ Inheritance diagram for GetId3\Module\Audio\Mp3:
+ Collaboration diagram for GetId3\Module\Audio\Mp3:

Public Member Functions

 analyze ()
 
 GuessEncoderOptions ()
 @staticvar array $NamedPresetBitrates @staticvar array $KnownEncoderValues @staticvar array $ExpectedLowpass @staticvar array $ExpectedResampledRate More...
 
 decodeMPEGaudioHeader ($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
 @staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup @staticvar type $MPEGaudioFrequencyLookup @staticvar type $MPEGaudioChannelModeLookup @staticvar type $MPEGaudioModeExtensionLookup @staticvar type $MPEGaudioEmphasisLookup @staticvar array $MPEGaudioHeaderDecodeCache @staticvar array $MPEGaudioHeaderValidCache More...
 
 RecursiveFrameScanning (&$offset, &$nextframetestoffset, $ScanAsCBR)
 
 FreeFormatFrameLength ($offset, $deepscan=false)
 
 getOnlyMPEGaudioInfoBruteForce ()
 
 getOnlyMPEGaudioInfo ($avdataoffset, $BitrateHistogram=false)
 @staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup More...
 
- Public Member Functions inherited from GetId3\Handler\BaseHandler
 __construct (GetId3Core $getid3, $call_module=null)
 
 analyze ()
 Analyze from file pointer. More...
 
 AnalyzeString (&$string)
 Analyze from string instead. More...
 
 saveAttachment (&$ThisFileInfoIndex, $filename, $offset, $length)
 

Static Public Member Functions

static MPEGaudioVersionArray ()
 @staticvar array $MPEGaudioVersion More...
 
static MPEGaudioLayerArray ()
 @staticvar array $MPEGaudioLayer More...
 
static MPEGaudioBitrateArray ()
 @staticvar type $MPEGaudioBitrate More...
 
static MPEGaudioFrequencyArray ()
 @staticvar array $MPEGaudioFrequency More...
 
static MPEGaudioChannelModeArray ()
 @staticvar array $MPEGaudioChannelMode More...
 
static MPEGaudioModeExtensionArray ()
 @staticvar array $MPEGaudioModeExtension More...
 
static MPEGaudioEmphasisArray ()
 @staticvar array $MPEGaudioEmphasis More...
 
static MPEGaudioHeaderBytesValid ($head4, $allowBitrate15=false)
 
static MPEGaudioHeaderValid ($rawarray, $echoerrors=false, $allowBitrate15=false)
 @staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup @staticvar type $MPEGaudioFrequencyLookup @staticvar type $MPEGaudioChannelModeLookup @staticvar type $MPEGaudioModeExtensionLookup @staticvar type $MPEGaudioEmphasisLookup More...
 
static MPEGaudioHeaderDecode ($Header4Bytes)
 
static MPEGaudioFrameLength (&$bitrate, &$version, &$layer, $padding, &$samplerate)
 @staticvar array $AudioFrameLengthCache More...
 
static ClosestStandardMP3Bitrate ($bit_rate)
 @staticvar array $standard_bit_rates @staticvar array $bit_rate_table More...
 
static XingVBRidOffset ($version, $channelmode)
 @staticvar array $XingVBRidOffsetCache More...
 
static LAMEvbrMethodLookup ($VBRmethodID)
 @staticvar array $LAMEvbrMethodLookup More...
 
static LAMEmiscStereoModeLookup ($StereoModeID)
 @staticvar array $LAMEmiscStereoModeLookup More...
 
static LAMEmiscSourceSampleFrequencyLookup ($SourceSampleFrequencyID)
 @staticvar array $LAMEmiscSourceSampleFrequencyLookup More...
 
static LAMEsurroundInfoLookup ($SurroundInfoID)
 @staticvar array $LAMEsurroundInfoLookup More...
 
static LAMEpresetUsedLookup ($LAMEtag)
 

Data Fields

 $allow_bruteforce = false
 
const GETID3_MP3_VALID_CHECK_FRAMES = 35
 

Additional Inherited Members

- Protected Member Functions inherited from GetId3\Handler\BaseHandler
 ftell ()
 
 fread ($bytes)
 
 fseek ($bytes, $whence=SEEK_SET)
 
 feof ()
 
 isDependencyFor ($module)
 
 error ($text)
 
 warning ($text)
 
- Protected Attributes inherited from GetId3\Handler\BaseHandler
 $getid3
 
 $data_string_flag = false
 
 $data_string = ''
 
 $data_string_position = 0
 
 $data_string_length = 0
 

Detailed Description

GetId3() by James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g //.

module for analyzing MP3 files

number of frames to scan to determine if MPEG-audio sequence is valid Lower this number to 5-20 for faster scanning Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams

Author
James Heinrich info@.nosp@m.geti.nosp@m.d3.or.nosp@m.g http://www.getid3.org

Definition at line 38 of file Mp3.php.

Member Function Documentation

◆ analyze()

GetId3\Module\Audio\Mp3::analyze ( )
Returns
boolean

Reimplemented from GetId3\Handler\BaseHandler.

Definition at line 52 of file Mp3.php.

53 {
54 $info = &$this->getid3->info;
55
56 $initialOffset = $info['avdataoffset'];
57
58 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {
59 if ($this->allow_bruteforce) {
60 $info['error'][] = 'Rescanning file in BruteForce mode';
61 $this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info);
62 }
63 }
64
65 if (isset($info['mpeg']['audio']['bitrate_mode'])) {
66 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);
67 }
68
69 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {
70
71 $synchoffsetwarning = 'Unknown data before synch ';
72 if (isset($info['id3v2']['headerlength'])) {
73 $synchoffsetwarning .= '(ID3v2 header ends at ' . $info['id3v2']['headerlength'] . ', then ' . ($info['avdataoffset'] - $info['id3v2']['headerlength']) . ' bytes garbage, ';
74 } elseif ($initialOffset > 0) {
75 $synchoffsetwarning .= '(should be at ' . $initialOffset . ', ';
76 } else {
77 $synchoffsetwarning .= '(should be at beginning of file, ';
78 }
79 $synchoffsetwarning .= 'synch detected at ' . $info['avdataoffset'] . ')';
80 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {
81
82 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {
83
84 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';
85 $info['audio']['codec'] = 'LAME';
86 $CurrentDataLAMEversionString = 'LAME3.';
87 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {
88
89 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';
90 $info['audio']['codec'] = 'LAME';
91 $CurrentDataLAMEversionString = 'LAME3.';
92 }
93 }
94 $info['warning'][] = $synchoffsetwarning;
95 }
96
97 if (isset($info['mpeg']['audio']['LAME'])) {
98 $info['audio']['codec'] = 'LAME';
99 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {
100 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'],
101 "\x00");
102 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {
103 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'],
104 "\x00");
105 }
106 }
107
108 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));
109 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString,
110 0, 6) == 'LAME3.') && !preg_match('[0-9\‍)]',
111 substr($CurrentDataLAMEversionString,
112 -1))) {
113 // a version number of LAME that does not end with a number like "LAME3.92"
114 // or with a closing parenthesis like "LAME3.88 (alpha)"
115 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)
116 // not sure what the actual last frame length will be, but will be less than or equal to 1441
117 $PossiblyLongerLAMEversion_FrameLength = 1441;
118
119 // Not sure what version of LAME this is - look in padding of last frame for longer version string
120 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;
121 fseek($this->getid3->fp, $PossibleLAMEversionStringOffset);
122 $PossiblyLongerLAMEversion_Data = fread($this->getid3->fp,
123 $PossiblyLongerLAMEversion_FrameLength);
124 switch (substr($CurrentDataLAMEversionString, -1)) {
125 case 'a':
126 case 'b':
127 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example
128 // need to trim off "a" to match longer string
129 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString,
130 0, -1);
131 break;
132 }
133 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data,
134 $CurrentDataLAMEversionString)) !== false) {
135 if (substr($PossiblyLongerLAMEversion_String, 0,
136 strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) {
137 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String,
138 0,
139 strspn($PossiblyLongerLAMEversion_String,
140 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)"
141 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) {
142 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString;
143 }
144 }
145 }
146 }
147 if (!empty($info['audio']['encoder'])) {
148 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 ");
149 }
150
151 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') {
152 case 1:
153 case 2:
154 $info['audio']['dataformat'] = 'mp' . $info['mpeg']['audio']['layer'];
155 break;
156 }
157 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) {
158 switch ($info['audio']['dataformat']) {
159 case 'mp1':
160 case 'mp2':
161 case 'mp3':
162 $info['fileformat'] = $info['audio']['dataformat'];
163 break;
164
165 default:
166 $info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "' . $info['audio']['dataformat'] . '"';
167 break;
168 }
169 }
170
171 if (empty($info['fileformat'])) {
172 unset($info['fileformat']);
173 unset($info['audio']['bitrate_mode']);
174 unset($info['avdataoffset']);
175 unset($info['avdataend']);
176
177 return false;
178 }
179
180 $info['mime_type'] = 'audio/mpeg';
181 $info['audio']['lossless'] = false;
182
183 // Calculate playtime
184 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) {
185 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate'];
186 }
187
188 $info['audio']['encoder_options'] = $this->GuessEncoderOptions();
189
190 return true;
191 }
GetId3\Handler\BaseHandler\fseek
fseek($bytes, $whence=SEEK_SET)
Definition: BaseHandler.php:148
GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce
getOnlyMPEGaudioInfoBruteForce()
Definition: Mp3.php:1345
GetId3\Module\Audio\Mp3\GuessEncoderOptions
GuessEncoderOptions()
@staticvar array $NamedPresetBitrates @staticvar array $KnownEncoderValues @staticvar array $Expected...
Definition: Mp3.php:201
GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo
getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false)
@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGau...
Definition: Mp3.php:1510
$info
$info
Definition: example_052.php:80

References $info, GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\GuessEncoderOptions().

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◆ ClosestStandardMP3Bitrate()

static GetId3\Module\Audio\Mp3::ClosestStandardMP3Bitrate (   $bit_rate)
static

@staticvar array $standard_bit_rates @staticvar array $bit_rate_table

Parameters
type$bit_rate
Returns
int

Definition at line 2146 of file Mp3.php.

2147 {
2148 static $standard_bit_rates = array(320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000);
2149 static $bit_rate_table = array(0 => '-');
2150 $round_bit_rate = intval(round($bit_rate, -3));
2151 if (!isset($bit_rate_table[$round_bit_rate])) {
2152 if ($round_bit_rate > max($standard_bit_rates)) {
2153 $bit_rate_table[$round_bit_rate] = round($bit_rate,
2154 2 - strlen($bit_rate));
2155 } else {
2156 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates);
2157 foreach ($standard_bit_rates as $standard_bit_rate) {
2158 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) {
2159 break;
2160 }
2161 $bit_rate_table[$round_bit_rate] = $standard_bit_rate;
2162 }
2163 }
2164 }
2165
2166 return $bit_rate_table[$round_bit_rate];
2167 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ decodeMPEGaudioHeader()

GetId3\Module\Audio\Mp3::decodeMPEGaudioHeader (   $offset,
&  $info,
  $recursivesearch = true,
  $ScanAsCBR = false,
  $FastMPEGheaderScan = false 
)

@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup @staticvar type $MPEGaudioFrequencyLookup @staticvar type $MPEGaudioChannelModeLookup @staticvar type $MPEGaudioModeExtensionLookup @staticvar type $MPEGaudioEmphasisLookup @staticvar array $MPEGaudioHeaderDecodeCache @staticvar array $MPEGaudioHeaderValidCache

Parameters
type$offset
type$info
type$recursivesearch
type$ScanAsCBR
type$FastMPEGheaderScan
Returns
boolean

Definition at line 453 of file Mp3.php.

457 {
458 static $MPEGaudioVersionLookup;
459 static $MPEGaudioLayerLookup;
460 static $MPEGaudioBitrateLookup;
461 static $MPEGaudioFrequencyLookup;
462 static $MPEGaudioChannelModeLookup;
463 static $MPEGaudioModeExtensionLookup;
464 static $MPEGaudioEmphasisLookup;
465 if (empty($MPEGaudioVersionLookup)) {
466 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
467 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
468 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
469 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
470 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
471 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
472 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
473 }
474
475 if (fseek($this->getid3->fp, $offset, SEEK_SET) != 0) {
476 $info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at ' . $offset;
477
478 return false;
479 }
480 //$headerstring = fread($this->getid3->fp, 1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
481 $headerstring = fread($this->getid3->fp, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data
482 // MP3 audio frame structure:
483 // $aa $aa $aa $aa [$bb $bb] $cc...
484 // where $aa..$aa is the four-byte mpeg-audio header (below)
485 // $bb $bb is the optional 2-byte CRC
486 // and $cc... is the audio data
487
488 $head4 = substr($headerstring, 0, 4);
489
490 static $MPEGaudioHeaderDecodeCache = array();
491 if (isset($MPEGaudioHeaderDecodeCache[$head4])) {
492 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4];
493 } else {
494 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
495 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray;
496 }
497
498 static $MPEGaudioHeaderValidCache = array();
499 if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache
500 //$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
501 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray,
502 false,
503 false);
504 }
505
506 // shortcut
507 if (!isset($info['mpeg']['audio'])) {
508 $info['mpeg']['audio'] = array();
509 }
510 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
511
512 if ($MPEGaudioHeaderValidCache[$head4]) {
513 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
514 } else {
515 $info['error'][] = 'Invalid MPEG audio header (' . Helper::PrintHexBytes($head4) . ') at offset ' . $offset;
516
517 return false;
518 }
519
520 if (!$FastMPEGheaderScan) {
521 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
522 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];
523
524 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
525 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
526 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
527 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection'];
528 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private'];
529 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
530 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright'];
531 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original'];
532 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];
533
534 $info['audio']['channels'] = $thisfile_mpeg_audio['channels'];
535 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];
536
537 if ($thisfile_mpeg_audio['protection']) {
538 $thisfile_mpeg_audio['crc'] = Helper::BigEndian2Int(substr($headerstring,
539 4,
540 2));
541 }
542 }
543
544 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
545 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
546 $info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1';
547 $thisfile_mpeg_audio['raw']['bitrate'] = 0;
548 }
549 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
550 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];
551
552 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
553 // only skip multiple frame check if free-format bitstream found at beginning of file
554 // otherwise is quite possibly simply corrupted data
555 $recursivesearch = false;
556 }
557
558 // For Layer 2 there are some combinations of bitrate and mode which are not allowed.
559 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {
560
561 $info['audio']['dataformat'] = 'mp2';
562 switch ($thisfile_mpeg_audio['channelmode']) {
563
564 case 'mono':
565 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
566 // these are ok
567 } else {
568 $info['error'][] = $thisfile_mpeg_audio['bitrate'] . 'kbps not allowed in Layer 2, ' . $thisfile_mpeg_audio['channelmode'] . '.';
569
570 return false;
571 }
572 break;
573
574 case 'stereo':
575 case 'joint stereo':
576 case 'dual channel':
577 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
578 // these are ok
579 } else {
580 $info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)) . 'kbps not allowed in Layer 2, ' . $thisfile_mpeg_audio['channelmode'] . '.';
581
582 return false;
583 }
584 break;
585 }
586 }
587
588 if ($info['audio']['sample_rate'] > 0) {
589 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'],
590 $thisfile_mpeg_audio['version'],
591 $thisfile_mpeg_audio['layer'],
592 (int) $thisfile_mpeg_audio['padding'],
593 $info['audio']['sample_rate']);
594 }
595
596 $nextframetestoffset = $offset + 1;
597 if ($thisfile_mpeg_audio['bitrate'] != 'free') {
598
599 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
600
601 if (isset($thisfile_mpeg_audio['framelength'])) {
602 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
603 } else {
604 $info['error'][] = 'Frame at offset(' . $offset . ') is has an invalid frame length.';
605
606 return false;
607 }
608 }
609
610 $ExpectedNumberOfAudioBytes = 0;
611
613 // Variable-bitrate headers
614
615 if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
616 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
617 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html
618
619 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
620 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer';
621 $info['audio']['codec'] = 'Fraunhofer';
622
623 $SideInfoData = substr($headerstring, 4 + 2, 32);
624
625 $FraunhoferVBROffset = 36;
626
627 $thisfile_mpeg_audio['VBR_encoder_version'] = Helper::BigEndian2Int(substr($headerstring,
628 $FraunhoferVBROffset + 4,
629 2)); // VbriVersion
630 $thisfile_mpeg_audio['VBR_encoder_delay'] = Helper::BigEndian2Int(substr($headerstring,
631 $FraunhoferVBROffset + 6,
632 2)); // VbriDelay
633 $thisfile_mpeg_audio['VBR_quality'] = Helper::BigEndian2Int(substr($headerstring,
634 $FraunhoferVBROffset + 8,
635 2)); // VbriQuality
636 $thisfile_mpeg_audio['VBR_bytes'] = Helper::BigEndian2Int(substr($headerstring,
637 $FraunhoferVBROffset + 10,
638 4)); // VbriStreamBytes
639 $thisfile_mpeg_audio['VBR_frames'] = Helper::BigEndian2Int(substr($headerstring,
640 $FraunhoferVBROffset + 14,
641 4)); // VbriStreamFrames
642 $thisfile_mpeg_audio['VBR_seek_offsets'] = Helper::BigEndian2Int(substr($headerstring,
643 $FraunhoferVBROffset + 18,
644 2)); // VbriTableSize
645 $thisfile_mpeg_audio['VBR_seek_scale'] = Helper::BigEndian2Int(substr($headerstring,
646 $FraunhoferVBROffset + 20,
647 2)); // VbriTableScale
648 $thisfile_mpeg_audio['VBR_entry_bytes'] = Helper::BigEndian2Int(substr($headerstring,
649 $FraunhoferVBROffset + 22,
650 2)); // VbriEntryBytes
651 $thisfile_mpeg_audio['VBR_entry_frames'] = Helper::BigEndian2Int(substr($headerstring,
652 $FraunhoferVBROffset + 24,
653 2)); // VbriEntryFrames
654
655 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];
656
657 $previousbyteoffset = $offset;
658 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
659 $Fraunhofer_OffsetN = Helper::BigEndian2Int(substr($headerstring,
660 $FraunhoferVBROffset,
661 $thisfile_mpeg_audio['VBR_entry_bytes']));
662 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
663 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
664 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
665 $previousbyteoffset += $Fraunhofer_OffsetN;
666 }
667 } else {
668
669 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
670 // depending on MPEG layer and number of channels
671
672 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'],
673 $thisfile_mpeg_audio['channelmode']);
674 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);
675
676 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring,
677 $VBRidOffset,
678 strlen('Info')) == 'Info')) {
679 // 'Xing' is traditional Xing VBR frame
680 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
681 // 'Info' *can* legally be used to specify a VBR file as well, however.
682 // http://www.multiweb.cz/twoinches/MP3inside.htm
683 //00..03 = "Xing" or "Info"
684 //04..07 = Flags:
685 // 0x01 Frames Flag set if value for number of frames in file is stored
686 // 0x02 Bytes Flag set if value for filesize in bytes is stored
687 // 0x04 TOC Flag set if values for TOC are stored
688 // 0x08 VBR Scale Flag set if values for VBR scale is stored
689 //08..11 Frames: Number of frames in file (including the first Xing/Info one)
690 //12..15 Bytes: File length in Bytes
691 //16..115 TOC (Table of Contents):
692 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
693 // Each Byte has a value according this formula:
694 // (TOC[i] / 256) * fileLenInBytes
695 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
696 // TOC[(60/240)*100] = TOC[25]
697 // and corresponding Byte in file is then approximately at:
698 // (TOC[25]/256) * 5000000
699 //116..119 VBR Scale
700 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
701// if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
702 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
703 $thisfile_mpeg_audio['VBR_method'] = 'Xing';
704// } else {
705// $ScanAsCBR = true;
706// $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
707// }
708
709 $thisfile_mpeg_audio['xing_flags_raw'] = Helper::BigEndian2Int(substr($headerstring,
710 $VBRidOffset + 4,
711 4));
712
713 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
714 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
715 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
716 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);
717
718 if ($thisfile_mpeg_audio['xing_flags']['frames']) {
719 $thisfile_mpeg_audio['VBR_frames'] = Helper::BigEndian2Int(substr($headerstring,
720 $VBRidOffset + 8,
721 4));
722 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
723 }
724 if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
725 $thisfile_mpeg_audio['VBR_bytes'] = Helper::BigEndian2Int(substr($headerstring,
726 $VBRidOffset + 12,
727 4));
728 }
729
730 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
731 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
732
733 $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames'];
734
735 if ($thisfile_mpeg_audio['layer'] == '1') {
736 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
737 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
738 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
739 } else {
740 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
741 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
742 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
743 }
744 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
745 }
746
747 if ($thisfile_mpeg_audio['xing_flags']['toc']) {
748 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
749 for ($i = 0; $i < 100; $i++) {
750 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i});
751 }
752 }
753 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
754 $thisfile_mpeg_audio['VBR_scale'] = Helper::BigEndian2Int(substr($headerstring,
755 $VBRidOffset + 116,
756 4));
757 }
758
759
760 // http://gabriel.mp3-tech.org/mp3infotag.html
761 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {
762
763 // shortcut
764 $thisfile_mpeg_audio['LAME'] = array();
765 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
766
767
768 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring,
769 $VBRidOffset + 120,
770 20);
771 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'],
772 0, 9);
773
774 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
775
776 // extra 11 chars are not part of version string when LAMEtag present
777 unset($thisfile_mpeg_audio_lame['long_version']);
778
779 // It the LAME tag was only introduced in LAME v3.90
780 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933
781 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
782 // are assuming a 'Xing' identifier offset of 0x24, which is the case for
783 // MPEG-1 non-mono, but not for other combinations
784 $LAMEtagOffsetContant = $VBRidOffset - 0x24;
785
786 // shortcuts
787 $thisfile_mpeg_audio_lame['RGAD'] = array('track' => array(), 'album' => array());
788 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD'];
789 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
790 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
791 $thisfile_mpeg_audio_lame['raw'] = array();
792 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw'];
793
794 // byte $9B VBR Quality
795 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
796 // Actually overwrites original Xing bytes
797 unset($thisfile_mpeg_audio['VBR_scale']);
798 $thisfile_mpeg_audio_lame['vbr_quality'] = Helper::BigEndian2Int(substr($headerstring,
799 $LAMEtagOffsetContant + 0x9B,
800 1));
801
802 // bytes $9C-$A4 Encoder short VersionString
803 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring,
804 $LAMEtagOffsetContant + 0x9C,
805 9);
806
807 // byte $A5 Info Tag revision + VBR method
808 $LAMEtagRevisionVBRmethod = Helper::BigEndian2Int(substr($headerstring,
809 $LAMEtagOffsetContant + 0xA5,
810 1));
811
812 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
813 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F;
814 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
815 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'],
816 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'
817 // byte $A6 Lowpass filter value
818 $thisfile_mpeg_audio_lame['lowpass_frequency'] = Helper::BigEndian2Int(substr($headerstring,
819 $LAMEtagOffsetContant + 0xA6,
820 1)) * 100;
821
822 // bytes $A7-$AE Replay Gain
823 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
824 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
825 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
826 // LAME 3.94a16 and later - 9.23 fixed point
827 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
828 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((Helper::BigEndian2Int(substr($headerstring,
829 $LAMEtagOffsetContant + 0xA7,
830 4))) / 8388608);
831 } else {
832 // LAME 3.94a15 and earlier - 32-bit floating point
833 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
834 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = Helper::LittleEndian2Float(substr($headerstring,
835 $LAMEtagOffsetContant + 0xA7,
836 4));
837 }
838 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
839 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
840 } else {
841 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = Helper::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
842 }
843
844 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = Helper::BigEndian2Int(substr($headerstring,
845 $LAMEtagOffsetContant + 0xAB,
846 2));
847 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = Helper::BigEndian2Int(substr($headerstring,
848 $LAMEtagOffsetContant + 0xAD,
849 2));
850
851
852 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {
853
854 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
855 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
856 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
857 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
858 $thisfile_mpeg_audio_lame_RGAD_track['name'] = Helper::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
859 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = Helper::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
860 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = Helper::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'],
861 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);
862
863 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
864 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
865 }
866 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
867 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
868 } else {
869 unset($thisfile_mpeg_audio_lame_RGAD['track']);
870 }
871 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {
872
873 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
874 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
875 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
876 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
877 $thisfile_mpeg_audio_lame_RGAD_album['name'] = Helper::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
878 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = Helper::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
879 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = Helper::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'],
880 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);
881
882 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
883 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
884 }
885 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
886 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
887 } else {
888 unset($thisfile_mpeg_audio_lame_RGAD['album']);
889 }
890 if (empty($thisfile_mpeg_audio_lame_RGAD)) {
891 unset($thisfile_mpeg_audio_lame['RGAD']);
892 }
893
894
895 // byte $AF Encoding flags + ATH Type
896 $EncodingFlagsATHtype = Helper::BigEndian2Int(substr($headerstring,
897 $LAMEtagOffsetContant + 0xAF,
898 1));
899 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10);
900 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
901 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40);
902 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80);
903 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F;
904
905 // byte $B0 if ABR {specified bitrate} else {minimal bitrate}
906 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = Helper::BigEndian2Int(substr($headerstring,
907 $LAMEtagOffsetContant + 0xB0,
908 1));
909 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
910 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
911 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
912 // ignore
913 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
914 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
915 }
916
917 // bytes $B1-$B3 Encoder delays
918 $EncoderDelays = Helper::BigEndian2Int(substr($headerstring,
919 $LAMEtagOffsetContant + 0xB1,
920 3));
921 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
922 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF;
923
924 // byte $B4 Misc
925 $MiscByte = Helper::BigEndian2Int(substr($headerstring,
926 $LAMEtagOffsetContant + 0xB4,
927 1));
928 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03);
929 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2;
930 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
931 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6;
932 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
933 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
934 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
935 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);
936
937 // byte $B5 MP3 Gain
938 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = Helper::BigEndian2Int(substr($headerstring,
939 $LAMEtagOffsetContant + 0xB5,
940 1),
941 false,
942 true);
943 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (Helper::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
944 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2,
945 ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));
946
947 // bytes $B6-$B7 Preset and surround info
948 $PresetSurroundBytes = Helper::BigEndian2Int(substr($headerstring,
949 $LAMEtagOffsetContant + 0xB6,
950 2));
951 // Reserved = ($PresetSurroundBytes & 0xC000);
952 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
953 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
954 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF);
955 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
956 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
957 $info['warning'][] = 'Unknown LAME preset used (' . $thisfile_mpeg_audio_lame['preset_used_id'] . ') - please report to info@getid3.org';
958 }
959 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
960 // this may change if 3.90.4 ever comes out
961 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
962 }
963
964 // bytes $B8-$BB MusicLength
965 $thisfile_mpeg_audio_lame['audio_bytes'] = Helper::BigEndian2Int(substr($headerstring,
966 $LAMEtagOffsetContant + 0xB8,
967 4));
968 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);
969
970 // bytes $BC-$BD MusicCRC
971 $thisfile_mpeg_audio_lame['music_crc'] = Helper::BigEndian2Int(substr($headerstring,
972 $LAMEtagOffsetContant + 0xBC,
973 2));
974
975 // bytes $BE-$BF CRC-16 of Info Tag
976 $thisfile_mpeg_audio_lame['lame_tag_crc'] = Helper::BigEndian2Int(substr($headerstring,
977 $LAMEtagOffsetContant + 0xBE,
978 2));
979
980
981 // LAME CBR
982 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {
983
984 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
985 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
986 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
987 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
988 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
989 //}
990 }
991 }
992 }
993 } else {
994
995 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
996 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
997 if ($recursivesearch) {
998 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
999 if ($this->RecursiveFrameScanning($offset,
1000 $nextframetestoffset, true)) {
1001 $recursivesearch = false;
1002 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
1003 }
1004 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
1005 $info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
1006 }
1007 }
1008 }
1009 }
1010
1011 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
1012 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
1013 if (isset($info['fileformat']) && ($info['fileformat'] == 'riff')) {
1014 // ignore, audio data is broken into chunks so will always be data "missing"
1015 } elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
1016 $info['warning'][] = 'Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)';
1017 } else {
1018 $info['warning'][] = 'Probable truncated file: expecting ' . $ExpectedNumberOfAudioBytes . ' bytes of audio data, only found ' . ($info['avdataend'] - $info['avdataoffset']) . ' (short by ' . ($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) . ' bytes)';
1019 }
1020 } else {
1021 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
1022 // $prenullbytefileoffset = ftell($this->getid3->fp);
1023 // fseek($this->getid3->fp, $info['avdataend'], SEEK_SET);
1024 // $PossibleNullByte = fread($this->getid3->fp, 1);
1025 // fseek($this->getid3->fp, $prenullbytefileoffset, SEEK_SET);
1026 // if ($PossibleNullByte === "\x00") {
1027 $info['avdataend']--;
1028 // $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored';
1029 // } else {
1030 // $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)';
1031 // }
1032 } else {
1033 $info['warning'][] = 'Too much data in file: expecting ' . $ExpectedNumberOfAudioBytes . ' bytes of audio data, found ' . ($info['avdataend'] - $info['avdataoffset']) . ' (' . (($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) . ' bytes too many)';
1034 }
1035 }
1036 }
1037
1038 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
1039 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
1040 $framebytelength = $this->FreeFormatFrameLength($offset, true);
1041 if ($framebytelength > 0) {
1042 $thisfile_mpeg_audio['framelength'] = $framebytelength;
1043 if ($thisfile_mpeg_audio['layer'] == '1') {
1044 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
1045 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
1046 } else {
1047 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
1048 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
1049 }
1050 } else {
1051 $info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
1052 }
1053 }
1054 }
1055
1056 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
1057 switch ($thisfile_mpeg_audio['bitrate_mode']) {
1058 case 'vbr':
1059 case 'abr':
1060 $bytes_per_frame = 1152;
1061 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
1062 $bytes_per_frame = 384;
1063 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
1064 $bytes_per_frame = 576;
1065 }
1066 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
1067 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
1068 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate'];
1069 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
1070 }
1071 break;
1072 }
1073 }
1074
1075 // End variable-bitrate headers
1077
1078 if ($recursivesearch) {
1079
1080 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset,
1081 $ScanAsCBR)) {
1082 return false;
1083 }
1084 }
1085
1086
1087 //if (false) {
1088 // // experimental side info parsing section - not returning anything useful yet
1089 //
1090 // $SideInfoBitstream = GetId3_lib::BigEndian2Bin($SideInfoData);
1091 // $SideInfoOffset = 0;
1092 //
1093 // if ($thisfile_mpeg_audio['version'] == '1') {
1094 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1095 // // MPEG-1 (mono)
1096 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1097 // $SideInfoOffset += 9;
1098 // $SideInfoOffset += 5;
1099 // } else {
1100 // // MPEG-1 (stereo, joint-stereo, dual-channel)
1101 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1102 // $SideInfoOffset += 9;
1103 // $SideInfoOffset += 3;
1104 // }
1105 // } else { // 2 or 2.5
1106 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
1107 // // MPEG-2, MPEG-2.5 (mono)
1108 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1109 // $SideInfoOffset += 8;
1110 // $SideInfoOffset += 1;
1111 // } else {
1112 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
1113 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1114 // $SideInfoOffset += 8;
1115 // $SideInfoOffset += 2;
1116 // }
1117 // }
1118 //
1119 // if ($thisfile_mpeg_audio['version'] == '1') {
1120 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1121 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
1122 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1123 // $SideInfoOffset += 2;
1124 // }
1125 // }
1126 // }
1127 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
1128 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
1129 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
1130 // $SideInfoOffset += 12;
1131 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1132 // $SideInfoOffset += 9;
1133 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
1134 // $SideInfoOffset += 8;
1135 // if ($thisfile_mpeg_audio['version'] == '1') {
1136 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1137 // $SideInfoOffset += 4;
1138 // } else {
1139 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
1140 // $SideInfoOffset += 9;
1141 // }
1142 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1143 // $SideInfoOffset += 1;
1144 //
1145 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
1146 //
1147 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
1148 // $SideInfoOffset += 2;
1149 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1150 // $SideInfoOffset += 1;
1151 //
1152 // for ($region = 0; $region < 2; $region++) {
1153 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1154 // $SideInfoOffset += 5;
1155 // }
1156 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
1157 //
1158 // for ($window = 0; $window < 3; $window++) {
1159 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1160 // $SideInfoOffset += 3;
1161 // }
1162 //
1163 // } else {
1164 //
1165 // for ($region = 0; $region < 3; $region++) {
1166 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
1167 // $SideInfoOffset += 5;
1168 // }
1169 //
1170 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
1171 // $SideInfoOffset += 4;
1172 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
1173 // $SideInfoOffset += 3;
1174 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
1175 // }
1176 //
1177 // if ($thisfile_mpeg_audio['version'] == '1') {
1178 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1179 // $SideInfoOffset += 1;
1180 // }
1181 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1182 // $SideInfoOffset += 1;
1183 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
1184 // $SideInfoOffset += 1;
1185 // }
1186 // }
1187 //}
1188 return true;
1189 }
GetId3\Lib\Helper\BigEndian2Int
static BigEndian2Int($byteword, $synchsafe=false, $signed=false)
Definition: Helper.php:374
GetId3\Lib\Helper\RGADoriginatorLookup
static RGADoriginatorLookup($originatorcode)
@staticvar array $RGADoriginator
Definition: Helper.php:1552
GetId3\Lib\Helper\LittleEndian2Float
static LittleEndian2Float($byteword)
Definition: Helper.php:277
GetId3\Lib\Helper\RGADamplitude2dB
static RGADamplitude2dB($amplitude)
Definition: Helper.php:1610
GetId3\Lib\Helper\PrintHexBytes
static PrintHexBytes($string, $hex=true, $spaces=true, $htmlencoding='UTF-8')
Definition: Helper.php:36
GetId3\Lib\Helper\RGADadjustmentLookup
static RGADadjustmentLookup($rawadjustment, $signbit)
Definition: Helper.php:1571
GetId3\Lib\Helper\RGADnameLookup
static RGADnameLookup($namecode)
@staticvar array $RGADname
Definition: Helper.php:1534
GetId3\Module\Audio\Mp3\MPEGaudioVersionArray
static MPEGaudioVersionArray()
@staticvar array $MPEGaudioVersion
Definition: Mp3.php:1818
GetId3\Module\Audio\Mp3\LAMEvbrMethodLookup
static LAMEvbrMethodLookup($VBRmethodID)
@staticvar array $LAMEvbrMethodLookup
Definition: Mp3.php:2208
GetId3\Module\Audio\Mp3\RecursiveFrameScanning
RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR)
Definition: Mp3.php:1198
GetId3\Module\Audio\Mp3\MPEGaudioModeExtensionArray
static MPEGaudioModeExtensionArray()
@staticvar array $MPEGaudioModeExtension
Definition: Mp3.php:1898
GetId3\Module\Audio\Mp3\MPEGaudioChannelModeArray
static MPEGaudioChannelModeArray()
@staticvar array $MPEGaudioChannelMode
Definition: Mp3.php:1886
GetId3\Module\Audio\Mp3\MPEGaudioEmphasisArray
static MPEGaudioEmphasisArray()
@staticvar array $MPEGaudioEmphasis
Definition: Mp3.php:1917
GetId3\Module\Audio\Mp3\FreeFormatFrameLength
FreeFormatFrameLength($offset, $deepscan=false)
Definition: Mp3.php:1252
GetId3\Module\Audio\Mp3\LAMEmiscStereoModeLookup
static LAMEmiscStereoModeLookup($StereoModeID)
@staticvar array $LAMEmiscStereoModeLookup
Definition: Mp3.php:2232
GetId3\Module\Audio\Mp3\MPEGaudioFrameLength
static MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate)
@staticvar array $AudioFrameLengthCache
Definition: Mp3.php:2085
GetId3\Module\Audio\Mp3\MPEGaudioBitrateArray
static MPEGaudioBitrateArray()
@staticvar type $MPEGaudioBitrate
Definition: Mp3.php:1842
GetId3\Module\Audio\Mp3\MPEGaudioHeaderDecode
static MPEGaudioHeaderDecode($Header4Bytes)
Definition: Mp3.php:2036
GetId3\Module\Audio\Mp3\MPEGaudioFrequencyArray
static MPEGaudioFrequencyArray()
@staticvar array $MPEGaudioFrequency
Definition: Mp3.php:1867
GetId3\Module\Audio\Mp3\LAMEsurroundInfoLookup
static LAMEsurroundInfoLookup($SurroundInfoID)
@staticvar array $LAMEsurroundInfoLookup
Definition: Mp3.php:2272
GetId3\Module\Audio\Mp3\LAMEmiscSourceSampleFrequencyLookup
static LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID)
@staticvar array $LAMEmiscSourceSampleFrequencyLookup
Definition: Mp3.php:2254
GetId3\Module\Audio\Mp3\ClosestStandardMP3Bitrate
static ClosestStandardMP3Bitrate($bit_rate)
@staticvar array $standard_bit_rates @staticvar array $bit_rate_table
Definition: Mp3.php:2146
GetId3\Module\Audio\Mp3\XingVBRidOffset
static XingVBRidOffset($version, $channelmode)
@staticvar array $XingVBRidOffsetCache
Definition: Mp3.php:2176
GetId3\Module\Audio\Mp3\LAMEpresetUsedLookup
static LAMEpresetUsedLookup($LAMEtag)
Definition: Mp3.php:2289
GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid
static MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false)
@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGau...
Definition: Mp3.php:1952
GetId3\Module\Audio\Mp3\MPEGaudioLayerArray
static MPEGaudioLayerArray()
@staticvar array $MPEGaudioLayer
Definition: Mp3.php:1830

References $info, GetId3\Lib\Helper\BigEndian2Int(), GetId3\Module\Audio\Mp3\ClosestStandardMP3Bitrate(), GetId3\Handler\BaseHandler\fread(), GetId3\Module\Audio\Mp3\FreeFormatFrameLength(), GetId3\Handler\BaseHandler\fseek(), GetId3\Module\Audio\Mp3\LAMEmiscSourceSampleFrequencyLookup(), GetId3\Module\Audio\Mp3\LAMEmiscStereoModeLookup(), GetId3\Module\Audio\Mp3\LAMEpresetUsedLookup(), GetId3\Module\Audio\Mp3\LAMEsurroundInfoLookup(), GetId3\Module\Audio\Mp3\LAMEvbrMethodLookup(), GetId3\Lib\Helper\LittleEndian2Float(), GetId3\Module\Audio\Mp3\MPEGaudioBitrateArray(), GetId3\Module\Audio\Mp3\MPEGaudioChannelModeArray(), GetId3\Module\Audio\Mp3\MPEGaudioEmphasisArray(), GetId3\Module\Audio\Mp3\MPEGaudioFrameLength(), GetId3\Module\Audio\Mp3\MPEGaudioFrequencyArray(), GetId3\Module\Audio\Mp3\MPEGaudioHeaderDecode(), GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid(), GetId3\Module\Audio\Mp3\MPEGaudioLayerArray(), GetId3\Module\Audio\Mp3\MPEGaudioModeExtensionArray(), GetId3\Module\Audio\Mp3\MPEGaudioVersionArray(), GetId3\Lib\Helper\PrintHexBytes(), GetId3\Module\Audio\Mp3\RecursiveFrameScanning(), GetId3\Lib\Helper\RGADadjustmentLookup(), GetId3\Lib\Helper\RGADamplitude2dB(), GetId3\Lib\Helper\RGADnameLookup(), GetId3\Lib\Helper\RGADoriginatorLookup(), and GetId3\Module\Audio\Mp3\XingVBRidOffset().

Referenced by GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo(), and GetId3\Module\Audio\Mp3\RecursiveFrameScanning().

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◆ FreeFormatFrameLength()

GetId3\Module\Audio\Mp3::FreeFormatFrameLength (   $offset,
  $deepscan = false 
)
Parameters
type$offset
type$deepscan
Returns
boolean

Definition at line 1252 of file Mp3.php.

1253 {
1254 $info = &$this->getid3->info;
1255
1256 fseek($this->getid3->fp, $offset, SEEK_SET);
1257 $MPEGaudioData = fread($this->getid3->fp, 32768);
1258
1259 $SyncPattern1 = substr($MPEGaudioData, 0, 4);
1260 // may be different pattern due to padding
1261 $SyncPattern2 = $SyncPattern1{0} . $SyncPattern1{1} . chr(ord($SyncPattern1{2}) | 0x02) . $SyncPattern1{3};
1262 if ($SyncPattern2 === $SyncPattern1) {
1263 $SyncPattern2 = $SyncPattern1{0} . $SyncPattern1{1} . chr(ord($SyncPattern1{2}) & 0xFD) . $SyncPattern1{3};
1264 }
1265
1266 $framelength = false;
1267 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4);
1268 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4);
1269 if ($framelength1 > 4) {
1270 $framelength = $framelength1;
1271 }
1272 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1273 $framelength = $framelength2;
1274 }
1275 if (!$framelength) {
1276
1277 // LAME 3.88 has a different value for modeextension on the first frame vs the rest
1278 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3),
1279 4);
1280 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3),
1281 4);
1282
1283 if ($framelength1 > 4) {
1284 $framelength = $framelength1;
1285 }
1286 if (($framelength2 > 4) && ($framelength2 < $framelength1)) {
1287 $framelength = $framelength2;
1288 }
1289 if (!$framelength) {
1290 $info['error'][] = 'Cannot find next free-format synch pattern (' . Helper::PrintHexBytes($SyncPattern1) . ' or ' . Helper::PrintHexBytes($SyncPattern2) . ') after offset ' . $offset;
1291
1292 return false;
1293 } else {
1294 $info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)';
1295 $info['audio']['codec'] = 'LAME';
1296 $info['audio']['encoder'] = 'LAME3.88';
1297 $SyncPattern1 = substr($SyncPattern1, 0, 3);
1298 $SyncPattern2 = substr($SyncPattern2, 0, 3);
1299 }
1300 }
1301
1302 if ($deepscan) {
1303
1304 $ActualFrameLengthValues = array();
1305 $nextoffset = $offset + $framelength;
1306 while ($nextoffset < ($info['avdataend'] - 6)) {
1307 fseek($this->getid3->fp, $nextoffset - 1, SEEK_SET);
1308 $NextSyncPattern = fread($this->getid3->fp, 6);
1309 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern,
1310 1,
1311 strlen($SyncPattern2)) == $SyncPattern2)) {
1312 // good - found where expected
1313 $ActualFrameLengthValues[] = $framelength;
1314 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern,
1315 0,
1316 strlen($SyncPattern2)) == $SyncPattern2)) {
1317 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was)
1318 $ActualFrameLengthValues[] = ($framelength - 1);
1319 $nextoffset--;
1320 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern,
1321 2,
1322 strlen($SyncPattern2)) == $SyncPattern2)) {
1323 // ok - found one byte later than expected (last frame was padded, first frame wasn't)
1324 $ActualFrameLengthValues[] = ($framelength + 1);
1325 $nextoffset++;
1326 } else {
1327 $info['error'][] = 'Did not find expected free-format sync pattern at offset ' . $nextoffset;
1328
1329 return false;
1330 }
1331 $nextoffset += $framelength;
1332 }
1333 if (count($ActualFrameLengthValues) > 0) {
1334 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues)));
1335 }
1336 }
1337
1338 return $framelength;
1339 }

References $info, GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), and GetId3\Lib\Helper\PrintHexBytes().

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ getOnlyMPEGaudioInfo()

GetId3\Module\Audio\Mp3::getOnlyMPEGaudioInfo (   $avdataoffset,
  $BitrateHistogram = false 
)

@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup

Parameters
type$avdataoffset
boolean$BitrateHistogram
Returns
boolean

Definition at line 1510 of file Mp3.php.

1511 {
1512 // looks for synch, decodes MPEG audio header
1513
1514 $info = &$this->getid3->info;
1515
1516 static $MPEGaudioVersionLookup;
1517 static $MPEGaudioLayerLookup;
1518 static $MPEGaudioBitrateLookup;
1519 if (empty($MPEGaudioVersionLookup)) {
1520 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1521 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1522 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1523 }
1524
1525 fseek($this->getid3->fp, $avdataoffset, SEEK_SET);
1526 $sync_seek_buffer_size = min(128 * 1024,
1527 $info['avdataend'] - $avdataoffset);
1528 if ($sync_seek_buffer_size <= 0) {
1529 $info['error'][] = 'Invalid $sync_seek_buffer_size at offset ' . $avdataoffset;
1530
1531 return false;
1532 }
1533 $header = fread($this->getid3->fp, $sync_seek_buffer_size);
1534 $sync_seek_buffer_size = strlen($header);
1535 $SynchSeekOffset = 0;
1536 while ($SynchSeekOffset < $sync_seek_buffer_size) {
1537 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) {
1538
1539 if ($SynchSeekOffset > $sync_seek_buffer_size) {
1540 // if a synch's not found within the first 128k bytes, then give up
1541 $info['error'][] = 'Could not find valid MPEG audio synch within the first ' . round($sync_seek_buffer_size / 1024) . 'kB';
1542 if (isset($info['audio']['bitrate'])) {
1543 unset($info['audio']['bitrate']);
1544 }
1545 if (isset($info['mpeg']['audio'])) {
1546 unset($info['mpeg']['audio']);
1547 }
1548 if (empty($info['mpeg'])) {
1549 unset($info['mpeg']);
1550 }
1551
1552 return false;
1553 } elseif (feof($this->getid3->fp)) {
1554
1555 $info['error'][] = 'Could not find valid MPEG audio synch before end of file';
1556 if (isset($info['audio']['bitrate'])) {
1557 unset($info['audio']['bitrate']);
1558 }
1559 if (isset($info['mpeg']['audio'])) {
1560 unset($info['mpeg']['audio']);
1561 }
1562 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) {
1563 unset($info['mpeg']);
1564 }
1565
1566 return false;
1567 }
1568 }
1569
1570 if (($SynchSeekOffset + 1) >= strlen($header)) {
1571 $info['error'][] = 'Could not find valid MPEG synch before end of file';
1572
1573 return false;
1574 }
1575
1576 if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected
1577 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) {
1578 $FirstFrameThisfileInfo = $info;
1579 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset;
1580 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset,
1581 $FirstFrameThisfileInfo,
1582 false)) {
1583 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's
1584 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below
1585 unset($FirstFrameThisfileInfo);
1586 }
1587 }
1588
1589 $dummy = $info; // only overwrite real data if valid header found
1590 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset,
1591 $dummy, true)) {
1592 $info = $dummy;
1593 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset;
1594 switch (isset($info['fileformat']) ? $info['fileformat'] : '') {
1595 case '':
1596 case 'id3':
1597 case 'ape':
1598 case 'mp3':
1599 $info['fileformat'] = 'mp3';
1600 $info['audio']['dataformat'] = 'mp3';
1601 break;
1602 }
1603 if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) {
1604 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) {
1605 // If there is garbage data between a valid VBR header frame and a sequence
1606 // of valid MPEG-audio frames the VBR data is no longer discarded.
1607 $info = $FirstFrameThisfileInfo;
1608 $info['avdataoffset'] = $FirstFrameAVDataOffset;
1609 $info['fileformat'] = 'mp3';
1610 $info['audio']['dataformat'] = 'mp3';
1611 $dummy = $info;
1612 unset($dummy['mpeg']['audio']);
1613 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength'];
1614 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset;
1615 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd,
1616 $dummy, true, true)) {
1617 $info = $dummy;
1618 $info['avdataoffset'] = $GarbageOffsetEnd;
1619 $info['warning'][] = 'apparently-valid VBR header not used because could not find ' . self::GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . '), but did find valid CBR stream starting at ' . $GarbageOffsetEnd;
1620 } else {
1621 $info['warning'][] = 'using data from VBR header even though could not find ' . self::GETID3_MP3_VALID_CHECK_FRAMES . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' . ($GarbageOffsetEnd - $GarbageOffsetStart) . ' bytes between ' . $GarbageOffsetStart . ' and ' . $GarbageOffsetEnd . ')';
1622 }
1623 }
1624 }
1625 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) {
1626 // VBR file with no VBR header
1627 $BitrateHistogram = true;
1628 }
1629
1630 if ($BitrateHistogram) {
1631
1632 $info['mpeg']['audio']['stereo_distribution'] = array('stereo' => 0, 'joint stereo' => 0, 'dual channel' => 0, 'mono' => 0);
1633 $info['mpeg']['audio']['version_distribution'] = array('1' => 0, '2' => 0, '2.5' => 0);
1634
1635 if ($info['mpeg']['audio']['version'] == '1') {
1636 if ($info['mpeg']['audio']['layer'] == 3) {
1637 $info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 40000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0);
1638 } elseif ($info['mpeg']['audio']['layer'] == 2) {
1639 $info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 48000 => 0, 56000 => 0, 64000 => 0, 80000 => 0, 96000 => 0, 112000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 320000 => 0, 384000 => 0);
1640 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1641 $info['mpeg']['audio']['bitrate_distribution'] = array('free' => 0, 32000 => 0, 64000 => 0, 96000 => 0, 128000 => 0, 160000 => 0, 192000 => 0, 224000 => 0, 256000 => 0, 288000 => 0, 320000 => 0, 352000 => 0, 384000 => 0, 416000 => 0, 448000 => 0);
1642 }
1643 } elseif ($info['mpeg']['audio']['layer'] == 1) {
1644 $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);
1645 } else {
1646 $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);
1647 }
1648
1649 $dummy = array('error' => $info['error'], 'warning' => $info['warning'], 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1650 $synchstartoffset = $info['avdataoffset'];
1651 fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
1652
1653 // you can play with these numbers:
1654 $max_frames_scan = 50000;
1655 $max_scan_segments = 10;
1656
1657 // don't play with these numbers:
1658 $FastMode = false;
1659 $SynchErrorsFound = 0;
1660 $frames_scanned = 0;
1661 $this_scan_segment = 0;
1662 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments);
1663 $pct_data_scanned = 0;
1664 for ($current_segment = 0;
1665 $current_segment < $max_scan_segments;
1666 $current_segment++) {
1667 $frames_scanned_this_segment = 0;
1668 if (ftell($this->getid3->fp) >= $info['avdataend']) {
1669 break;
1670 }
1671 $scan_start_offset[$current_segment] = max(ftell($this->getid3->fp),
1672 $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments)));
1673 if ($current_segment > 0) {
1674 fseek($this->getid3->fp,
1675 $scan_start_offset[$current_segment],
1676 SEEK_SET);
1677 $buffer_4k = fread($this->getid3->fp, 4096);
1678 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) {
1679 if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected
1680 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j,
1681 $dummy,
1682 false,
1683 false,
1684 $FastMode)) {
1685 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength'];
1686 if ($this->decodeMPEGaudioHeader($calculated_next_offset,
1687 $dummy,
1688 false,
1689 false,
1690 $FastMode)) {
1691 $scan_start_offset[$current_segment] += $j;
1692 break;
1693 }
1694 }
1695 }
1696 }
1697 }
1698 $synchstartoffset = $scan_start_offset[$current_segment];
1699 while ($this->decodeMPEGaudioHeader($synchstartoffset,
1700 $dummy, false,
1701 false, $FastMode)) {
1702 $FastMode = true;
1703 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']];
1704
1705 if (empty($dummy['mpeg']['audio']['framelength'])) {
1706 $SynchErrorsFound++;
1707 $synchstartoffset++;
1708 } else {
1709 Helper::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]);
1710 Helper::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]);
1711 Helper::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]);
1712 $synchstartoffset += $dummy['mpeg']['audio']['framelength'];
1713 }
1714 $frames_scanned++;
1715 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) {
1716 $this_pct_scanned = (ftell($this->getid3->fp) - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']);
1717 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) {
1718 // file likely contains < $max_frames_scan, just scan as one segment
1719 $max_scan_segments = 1;
1720 $frames_scan_per_segment = $max_frames_scan;
1721 } else {
1722 $pct_data_scanned += $this_pct_scanned;
1723 break;
1724 }
1725 }
1726 }
1727 }
1728 if ($pct_data_scanned > 0) {
1729 $info['warning'][] = 'too many MPEG audio frames to scan, only scanned ' . $frames_scanned . ' frames in ' . $max_scan_segments . ' segments (' . number_format($pct_data_scanned * 100,
1730 1) . '% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
1731 foreach ($info['mpeg']['audio'] as $key1 => $value1) {
1732 if (!preg_match('#_distribution$#i', $key1)) {
1733 continue;
1734 }
1735 foreach ($value1 as $key2 => $value2) {
1736 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned);
1737 }
1738 }
1739 }
1740
1741 if ($SynchErrorsFound > 0) {
1742 $info['warning'][] = 'Found ' . $SynchErrorsFound . ' synch errors in histogram analysis';
1743 //return false;
1744 }
1745
1746 $bittotal = 0;
1747 $framecounter = 0;
1748 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) {
1749 $framecounter += $bitratecount;
1750 if ($bitratevalue != 'free') {
1751 $bittotal += ($bitratevalue * $bitratecount);
1752 }
1753 }
1754 if ($framecounter == 0) {
1755 $info['error'][] = 'Corrupt MP3 file: framecounter == zero';
1756
1757 return false;
1758 }
1759 $info['mpeg']['audio']['frame_count'] = Helper::CastAsInt($framecounter);
1760 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter);
1761
1762 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1763
1764
1765 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently
1766 $distinct_bitrates = 0;
1767 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) {
1768 if ($bitrate_count > 0) {
1769 $distinct_bitrates++;
1770 }
1771 }
1772 if ($distinct_bitrates > 1) {
1773 $info['mpeg']['audio']['bitrate_mode'] = 'vbr';
1774 } else {
1775 $info['mpeg']['audio']['bitrate_mode'] = 'cbr';
1776 }
1777 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1778 }
1779
1780 break; // exit while()
1781 }
1782 }
1783
1784 $SynchSeekOffset++;
1785 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) {
1786 // end of file/data
1787
1788 if (empty($info['mpeg']['audio'])) {
1789
1790 $info['error'][] = 'could not find valid MPEG synch before end of file';
1791 if (isset($info['audio']['bitrate'])) {
1792 unset($info['audio']['bitrate']);
1793 }
1794 if (isset($info['mpeg']['audio'])) {
1795 unset($info['mpeg']['audio']);
1796 }
1797 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) {
1798 unset($info['mpeg']);
1799 }
1800
1801 return false;
1802 }
1803 break;
1804 }
1805 }
1806 $info['audio']['channels'] = $info['mpeg']['audio']['channels'];
1807 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode'];
1808 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1809
1810 return true;
1811 }
GetId3\Lib\Helper\safe_inc
static safe_inc(&$variable, $increment=1)
Definition: Helper.php:91
GetId3\Lib\Helper\CastAsInt
static CastAsInt($floatnum)
Definition: Helper.php:107
GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader
decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false)
@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGau...
Definition: Mp3.php:453
$header
$header
Definition: example_011.php:123

References $header, $info, GetId3\Lib\Helper\CastAsInt(), GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Handler\BaseHandler\feof(), GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), GetId3\Handler\BaseHandler\ftell(), GetId3\Module\Audio\Mp3\MPEGaudioBitrateArray(), GetId3\Module\Audio\Mp3\MPEGaudioLayerArray(), GetId3\Module\Audio\Mp3\MPEGaudioVersionArray(), and GetId3\Lib\Helper\safe_inc().

Referenced by GetId3\Module\Audio\Mp3\analyze().

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◆ getOnlyMPEGaudioInfoBruteForce()

GetId3\Module\Audio\Mp3::getOnlyMPEGaudioInfoBruteForce ( )
Returns
boolean

Definition at line 1345 of file Mp3.php.

1346 {
1347 $MPEGaudioHeaderDecodeCache = array();
1348 $MPEGaudioHeaderValidCache = array();
1349 $MPEGaudioHeaderLengthCache = array();
1350 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1351 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1352 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1353 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1354 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1355 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1356 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1357 $LongMPEGversionLookup = array();
1358 $LongMPEGlayerLookup = array();
1359 $LongMPEGbitrateLookup = array();
1360 $LongMPEGpaddingLookup = array();
1361 $LongMPEGfrequencyLookup = array();
1362 $Distribution['bitrate'] = array();
1363 $Distribution['frequency'] = array();
1364 $Distribution['layer'] = array();
1365 $Distribution['version'] = array();
1366 $Distribution['padding'] = array();
1367
1368 $info = &$this->getid3->info;
1369 fseek($this->getid3->fp, $info['avdataoffset'], SEEK_SET);
1370
1371 $max_frames_scan = 5000;
1372 $frames_scanned = 0;
1373
1374 $previousvalidframe = $info['avdataoffset'];
1375 while (ftell($this->getid3->fp) < $info['avdataend']) {
1376 set_time_limit(30);
1377 $head4 = fread($this->getid3->fp, 4);
1378 if (strlen($head4) < 4) {
1379 break;
1380 }
1381 if ($head4{0} != "\xFF") {
1382 for ($i = 1; $i < 4; $i++) {
1383 if ($head4{$i} == "\xFF") {
1384 fseek($this->getid3->fp, $i - 4, SEEK_CUR);
1385 continue 2;
1386 }
1387 }
1388 continue;
1389 }
1390 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
1391 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
1392 }
1393 if (!isset($MPEGaudioHeaderValidCache[$head4])) {
1394 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4],
1395 false,
1396 false);
1397 }
1398 if ($MPEGaudioHeaderValidCache[$head4]) {
1399
1400 if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
1401 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
1402 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
1403 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
1404 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
1405 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
1406 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
1407 $LongMPEGbitrateLookup[$head4],
1408 $LongMPEGversionLookup[$head4],
1409 $LongMPEGlayerLookup[$head4],
1410 $LongMPEGpaddingLookup[$head4],
1411 $LongMPEGfrequencyLookup[$head4]);
1412 }
1413 if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
1414 $WhereWeWere = ftell($this->getid3->fp);
1415 fseek($this->getid3->fp,
1416 $MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
1417 $next4 = fread($this->getid3->fp, 4);
1418 if ($next4{0} == "\xFF") {
1419 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
1420 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
1421 }
1422 if (!isset($MPEGaudioHeaderValidCache[$next4])) {
1423 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4],
1424 false,
1425 false);
1426 }
1427 if ($MPEGaudioHeaderValidCache[$next4]) {
1428 fseek($this->getid3->fp, -4, SEEK_CUR);
1429
1430 Helper::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
1431 Helper::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
1432 Helper::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
1433 Helper::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
1434 Helper::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
1435 if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
1436 $pct_data_scanned = (ftell($this->getid3->fp) - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
1437 $info['warning'][] = 'too many MPEG audio frames to scan, only scanned first ' . $max_frames_scan . ' frames (' . number_format($pct_data_scanned * 100,
1438 1) . '% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
1439 foreach ($Distribution as $key1 => $value1) {
1440 foreach ($value1 as $key2 => $value2) {
1441 $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
1442 }
1443 }
1444 break;
1445 }
1446 continue;
1447 }
1448 }
1449 unset($next4);
1450 fseek($this->getid3->fp, $WhereWeWere - 3, SEEK_SET);
1451 }
1452 }
1453 }
1454 foreach ($Distribution as $key => $value) {
1455 ksort($Distribution[$key], SORT_NUMERIC);
1456 }
1457 ksort($Distribution['version'], SORT_STRING);
1458 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate'];
1459 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
1460 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer'];
1461 $info['mpeg']['audio']['version_distribution'] = $Distribution['version'];
1462 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding'];
1463 if (count($Distribution['version']) > 1) {
1464 $info['error'][] = 'Corrupt file - more than one MPEG version detected';
1465 }
1466 if (count($Distribution['layer']) > 1) {
1467 $info['error'][] = 'Corrupt file - more than one MPEG layer detected';
1468 }
1469 if (count($Distribution['frequency']) > 1) {
1470 $info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
1471 }
1472
1473
1474 $bittotal = 0;
1475 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
1476 if ($bitratevalue != 'free') {
1477 $bittotal += ($bitratevalue * $bitratecount);
1478 }
1479 }
1480 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']);
1481 if ($info['mpeg']['audio']['frame_count'] == 0) {
1482 $info['error'][] = 'no MPEG audio frames found';
1483
1484 return false;
1485 }
1486 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']);
1487 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
1488 $info['mpeg']['audio']['sample_rate'] = Helper::array_max($Distribution['frequency'],
1489 true);
1490
1491 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate'];
1492 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
1493 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate'];
1494 $info['audio']['dataformat'] = 'mp' . Helper::array_max($Distribution['layer'],
1495 true);
1496 $info['fileformat'] = $info['audio']['dataformat'];
1497
1498 return true;
1499 }
GetId3\Lib\Helper\array_max
static array_max($arraydata, $returnkey=false)
Definition: Helper.php:755

References $info, GetId3\Lib\Helper\array_max(), GetId3\Handler\BaseHandler\fread(), GetId3\Handler\BaseHandler\fseek(), GetId3\Handler\BaseHandler\ftell(), GetId3\Module\Audio\Mp3\MPEGaudioBitrateArray(), GetId3\Module\Audio\Mp3\MPEGaudioChannelModeArray(), GetId3\Module\Audio\Mp3\MPEGaudioEmphasisArray(), GetId3\Module\Audio\Mp3\MPEGaudioFrameLength(), GetId3\Module\Audio\Mp3\MPEGaudioFrequencyArray(), GetId3\Module\Audio\Mp3\MPEGaudioHeaderDecode(), GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid(), GetId3\Module\Audio\Mp3\MPEGaudioLayerArray(), GetId3\Module\Audio\Mp3\MPEGaudioModeExtensionArray(), GetId3\Module\Audio\Mp3\MPEGaudioVersionArray(), and GetId3\Lib\Helper\safe_inc().

Referenced by GetId3\Module\Audio\Mp3\analyze().

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◆ GuessEncoderOptions()

GetId3\Module\Audio\Mp3::GuessEncoderOptions ( )

@staticvar array $NamedPresetBitrates @staticvar array $KnownEncoderValues @staticvar array $ExpectedLowpass @staticvar array $ExpectedResampledRate

Returns
type

Definition at line 201 of file Mp3.php.

202 {
203 // shortcuts
204 $info = &$this->getid3->info;
205 if (!empty($info['mpeg']['audio'])) {
206 $thisfile_mpeg_audio = &$info['mpeg']['audio'];
207 if (!empty($thisfile_mpeg_audio['LAME'])) {
208 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME'];
209 }
210 }
211
212 $encoder_options = '';
213 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256);
214
215 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) {
216
217 $encoder_options = 'VBR q' . $thisfile_mpeg_audio['VBR_quality'];
218 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'],
219 $NamedPresetBitrates))) {
220
221 $encoder_options = $thisfile_mpeg_audio_lame['preset_used'];
222 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) {
223
224 static $KnownEncoderValues = array();
225 if (empty($KnownEncoderValues)) {
226
227 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name';
228 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92
229 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91
230 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95
231 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92
232 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91
233 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3
234 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92
235 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91
236 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
237 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3
238 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
239 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3
240 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92
241 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91
242 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95
243 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3
244 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3
245
246 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
247 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1
248 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93
249 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95
250 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
251 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1
252 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93
253 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95
254 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
255 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1
256 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95
257 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
258 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
259 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92
260 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1
261 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95
262 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1
263 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95
264 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14
265 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92
266 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91
267 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1
268 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95
269 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14
270 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15
271 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1
272 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93
273 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95
274 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14
275 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15
276 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1
277 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93
278 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95
279 }
280
281 if (isset($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']])) {
282
283 $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']];
284 } 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']])) {
285
286 $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']][$thisfile_mpeg_audio_lame['lowpass_frequency']];
287 } elseif ($info['audio']['bitrate_mode'] == 'vbr') {
288
289 // http://gabriel.mp3-tech.org/mp3infotag.html
290 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h
291
292 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10);
293 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10);
294 $encoder_options = '-V' . $LAME_V_value . ' -q' . $LAME_q_value;
295 } elseif ($info['audio']['bitrate_mode'] == 'cbr') {
296
297 $encoder_options = strtoupper($info['audio']['bitrate_mode']) . ceil($info['audio']['bitrate'] / 1000);
298 } else {
299
300 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
301 }
302 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) {
303
304 $encoder_options = 'ABR' . $thisfile_mpeg_audio_lame['bitrate_abr'];
305 } elseif (!empty($info['audio']['bitrate'])) {
306
307 if ($info['audio']['bitrate_mode'] == 'cbr') {
308 $encoder_options = strtoupper($info['audio']['bitrate_mode']) . ceil($info['audio']['bitrate'] / 1000);
309 } else {
310 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
311 }
312 }
313 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) {
314 $encoder_options .= ' -b' . $thisfile_mpeg_audio_lame['bitrate_min'];
315 }
316
317 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) {
318 $encoder_options .= ' --nogap';
319 }
320
321 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) {
322 $ExplodedOptions = explode(' ', $encoder_options, 4);
323 if ($ExplodedOptions[0] == '--r3mix') {
324 $ExplodedOptions[1] = 'r3mix';
325 }
326 switch ($ExplodedOptions[0]) {
327 case '--preset':
328 case '--alt-preset':
329 case '--r3mix':
330 if ($ExplodedOptions[1] == 'fast') {
331 $ExplodedOptions[1] .= ' ' . $ExplodedOptions[2];
332 }
333 switch ($ExplodedOptions[1]) {
334 case 'portable':
335 case 'medium':
336 case 'standard':
337 case 'extreme':
338 case 'insane':
339 case 'fast portable':
340 case 'fast medium':
341 case 'fast standard':
342 case 'fast extreme':
343 case 'fast insane':
344 case 'r3mix':
345 static $ExpectedLowpass = array(
346 'insane|20500' => 20500,
347 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91
348 'medium|18000' => 18000,
349 'fast medium|18000' => 18000,
350 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
351 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
352 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95
353 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1
354 'standard|19000' => 19000,
355 'fast standard|19000' => 19000,
356 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92
357 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91
358 'r3mix|18000' => 18000, // 3.94, 3.95
359 );
360 if (!isset($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))) {
361 $encoder_options .= ' --lowpass ' . $thisfile_mpeg_audio_lame['lowpass_frequency'];
362 }
363 break;
364
365 default:
366 break;
367 }
368 break;
369 }
370 }
371
372 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) {
373 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) {
374 $encoder_options .= ' --resample 44100';
375 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) {
376 $encoder_options .= ' --resample 48000';
377 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) {
378 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) {
379 case 0: // <= 32000
380 // may or may not be same as source frequency - ignore
381 break;
382 case 1: // 44100
383 case 2: // 48000
384 case 3: // 48000+
385 $ExplodedOptions = explode(' ', $encoder_options, 4);
386 switch ($ExplodedOptions[0]) {
387 case '--preset':
388 case '--alt-preset':
389 switch ($ExplodedOptions[1]) {
390 case 'fast':
391 case 'portable':
392 case 'medium':
393 case 'standard':
394 case 'extreme':
395 case 'insane':
396 $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];
397 break;
398
399 default:
400 static $ExpectedResampledRate = array(
401 'phon+/lw/mw-eu/sw|16000' => 16000,
402 'mw-us|24000' => 24000, // 3.95
403 'mw-us|32000' => 32000, // 3.93
404 'mw-us|16000' => 16000, // 3.92
405 'phone|16000' => 16000,
406 'phone|11025' => 11025, // 3.94a15
407 'radio|32000' => 32000, // 3.94a15
408 'fm/radio|32000' => 32000, // 3.92
409 'fm|32000' => 32000, // 3.90
410 'voice|32000' => 32000);
411 if (!isset($ExpectedResampledRate[$ExplodedOptions[1] . '|' . $thisfile_mpeg_audio['sample_rate']])) {
412 $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];
413 }
414 break;
415 }
416 break;
417
418 case '--r3mix':
419 default:
420 $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate'];
421 break;
422 }
423 break;
424 }
425 }
426 }
427 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) {
428 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000);
429 $encoder_options = strtoupper($info['audio']['bitrate_mode']);
430 }
431
432 return $encoder_options;
433 }

References $info.

Referenced by GetId3\Module\Audio\Mp3\analyze().

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◆ LAMEmiscSourceSampleFrequencyLookup()

static GetId3\Module\Audio\Mp3::LAMEmiscSourceSampleFrequencyLookup (   $SourceSampleFrequencyID)
static

@staticvar array $LAMEmiscSourceSampleFrequencyLookup

Parameters
type$SourceSampleFrequencyID
Returns
type

Definition at line 2254 of file Mp3.php.

2255 {
2256 static $LAMEmiscSourceSampleFrequencyLookup = array(
2257 0 => '<= 32 kHz',
2258 1 => '44.1 kHz',
2259 2 => '48 kHz',
2260 3 => '> 48kHz'
2261 );
2262
2263 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : '');
2264 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ LAMEmiscStereoModeLookup()

static GetId3\Module\Audio\Mp3::LAMEmiscStereoModeLookup (   $StereoModeID)
static

@staticvar array $LAMEmiscStereoModeLookup

Parameters
type$StereoModeID
Returns
type

Definition at line 2232 of file Mp3.php.

2233 {
2234 static $LAMEmiscStereoModeLookup = array(
2235 0 => 'mono',
2236 1 => 'stereo',
2237 2 => 'dual mono',
2238 3 => 'joint stereo',
2239 4 => 'forced stereo',
2240 5 => 'auto',
2241 6 => 'intensity stereo',
2242 7 => 'other'
2243 );
2244
2245 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : '');
2246 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ LAMEpresetUsedLookup()

static GetId3\Module\Audio\Mp3::LAMEpresetUsedLookup (   $LAMEtag)
static
Parameters
type$LAMEtag
Returns
string

Definition at line 2289 of file Mp3.php.

2290 {
2291
2292 if ($LAMEtag['preset_used_id'] == 0) {
2293 // no preset used (LAME >=3.93)
2294 // no preset recorded (LAME <3.93)
2295 return '';
2296 }
2297 $LAMEpresetUsedLookup = array();
2298
2300 for ($i = 8; $i <= 320; $i++) {
2301 switch ($LAMEtag['vbr_method']) {
2302 case 'cbr':
2303 $LAMEpresetUsedLookup[$i] = '--alt-preset ' . $LAMEtag['vbr_method'] . ' ' . $i;
2304 break;
2305 case 'abr':
2306 default: // other VBR modes shouldn't be here(?)
2307 $LAMEpresetUsedLookup[$i] = '--alt-preset ' . $i;
2308 break;
2309 }
2310 }
2311
2312 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()
2313 // named alt-presets
2314 $LAMEpresetUsedLookup[1000] = '--r3mix';
2315 $LAMEpresetUsedLookup[1001] = '--alt-preset standard';
2316 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme';
2317 $LAMEpresetUsedLookup[1003] = '--alt-preset insane';
2318 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';
2319 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';
2320 $LAMEpresetUsedLookup[1006] = '--alt-preset medium';
2321 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';
2322
2323 // LAME 3.94 additions/changes
2324 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003
2325 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003
2326
2327 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003
2328 $LAMEpresetUsedLookup[410] = '-V9';
2329 $LAMEpresetUsedLookup[420] = '-V8';
2330 $LAMEpresetUsedLookup[440] = '-V6';
2331 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003
2332 $LAMEpresetUsedLookup[450] = '--preset ' . (($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '') . 'portable'; // 3.94a15 Nov 12 2003
2333 $LAMEpresetUsedLookup[460] = '--preset ' . (($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '') . 'medium'; // 3.94a15 Nov 12 2003
2334 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003
2335 $LAMEpresetUsedLookup[480] = '--preset ' . (($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '') . 'standard'; // 3.94a15 Nov 12 2003
2336 $LAMEpresetUsedLookup[490] = '-V1';
2337 $LAMEpresetUsedLookup[500] = '--preset ' . (($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '') . 'extreme'; // 3.94a15 Nov 12 2003
2338
2339 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: ' . $LAMEtag['preset_used_id'] . ' - report to info@getid3.org');
2340 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ LAMEsurroundInfoLookup()

static GetId3\Module\Audio\Mp3::LAMEsurroundInfoLookup (   $SurroundInfoID)
static

@staticvar array $LAMEsurroundInfoLookup

Parameters
type$SurroundInfoID
Returns
type

Definition at line 2272 of file Mp3.php.

2273 {
2274 static $LAMEsurroundInfoLookup = array(
2275 0 => 'no surround info',
2276 1 => 'DPL encoding',
2277 2 => 'DPL2 encoding',
2278 3 => 'Ambisonic encoding'
2279 );
2280
2281 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved');
2282 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ LAMEvbrMethodLookup()

static GetId3\Module\Audio\Mp3::LAMEvbrMethodLookup (   $VBRmethodID)
static

@staticvar array $LAMEvbrMethodLookup

Parameters
type$VBRmethodID
Returns
type

Definition at line 2208 of file Mp3.php.

2209 {
2210 static $LAMEvbrMethodLookup = array(
2211 0x00 => 'unknown',
2212 0x01 => 'cbr',
2213 0x02 => 'abr',
2214 0x03 => 'vbr-old / vbr-rh',
2215 0x04 => 'vbr-new / vbr-mtrh',
2216 0x05 => 'vbr-mt',
2217 0x06 => 'vbr (full vbr method 4)',
2218 0x08 => 'cbr (constant bitrate 2 pass)',
2219 0x09 => 'abr (2 pass)',
2220 0x0F => 'reserved'
2221 );
2222
2223 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : '');
2224 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ MPEGaudioBitrateArray()

static GetId3\Module\Audio\Mp3::MPEGaudioBitrateArray ( )
static

@staticvar type $MPEGaudioBitrate

Returns
type

Definition at line 1842 of file Mp3.php.

1843 {
1844 static $MPEGaudioBitrate;
1845 if (empty($MPEGaudioBitrate)) {
1846 $MPEGaudioBitrate = array(
1847 '1' => array(1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000),
1848 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000),
1849 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000)
1850 ),
1851 '2' => array(1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000),
1852 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000),
1853 )
1854 );
1855 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2];
1856 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2'];
1857 }
1858
1859 return $MPEGaudioBitrate;
1860 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioChannelModeArray()

static GetId3\Module\Audio\Mp3::MPEGaudioChannelModeArray ( )
static

@staticvar array $MPEGaudioChannelMode

Returns
string

Definition at line 1886 of file Mp3.php.

1887 {
1888 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono');
1889
1890 return $MPEGaudioChannelMode;
1891 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioEmphasisArray()

static GetId3\Module\Audio\Mp3::MPEGaudioEmphasisArray ( )
static

@staticvar array $MPEGaudioEmphasis

Returns
boolean

Definition at line 1917 of file Mp3.php.

1918 {
1919 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17');
1920
1921 return $MPEGaudioEmphasis;
1922 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioFrameLength()

static GetId3\Module\Audio\Mp3::MPEGaudioFrameLength ( &  $bitrate,
&  $version,
&  $layer,
  $padding,
&  $samplerate 
)
static

@staticvar array $AudioFrameLengthCache

Parameters
type$bitrate
type$version
type$layer
type$padding
type$samplerate
Returns
type

Definition at line 2085 of file Mp3.php.

2087 {
2088 static $AudioFrameLengthCache = array();
2089
2090 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) {
2091 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false;
2092 if ($bitrate != 'free') {
2093
2094 if ($version == '1') {
2095
2096 if ($layer == '1') {
2097
2098 // For Layer I slot is 32 bits long
2099 $FrameLengthCoefficient = 48;
2100 $SlotLength = 4;
2101 } else { // Layer 2 / 3
2102 // for Layer 2 and Layer 3 slot is 8 bits long.
2103 $FrameLengthCoefficient = 144;
2104 $SlotLength = 1;
2105 }
2106 } else { // MPEG-2 / MPEG-2.5
2107 if ($layer == '1') {
2108
2109 // For Layer I slot is 32 bits long
2110 $FrameLengthCoefficient = 24;
2111 $SlotLength = 4;
2112 } elseif ($layer == '2') {
2113
2114 // for Layer 2 and Layer 3 slot is 8 bits long.
2115 $FrameLengthCoefficient = 144;
2116 $SlotLength = 1;
2117 } else { // layer 3
2118 // for Layer 2 and Layer 3 slot is 8 bits long.
2119 $FrameLengthCoefficient = 72;
2120 $SlotLength = 1;
2121 }
2122 }
2123
2124 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding
2125 if ($samplerate > 0) {
2126 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate;
2127 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I)
2128 if ($padding) {
2129 $NewFramelength += $SlotLength;
2130 }
2131 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength;
2132 }
2133 }
2134 }
2135
2136 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate];
2137 }

References $version.

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), and GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce().

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◆ MPEGaudioFrequencyArray()

static GetId3\Module\Audio\Mp3::MPEGaudioFrequencyArray ( )
static

@staticvar array $MPEGaudioFrequency

Returns
array

Definition at line 1867 of file Mp3.php.

1868 {
1869 static $MPEGaudioFrequency;
1870 if (empty($MPEGaudioFrequency)) {
1871 $MPEGaudioFrequency = array(
1872 '1' => array(44100, 48000, 32000),
1873 '2' => array(22050, 24000, 16000),
1874 '2.5' => array(11025, 12000, 8000)
1875 );
1876 }
1877
1878 return $MPEGaudioFrequency;
1879 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioHeaderBytesValid()

static GetId3\Module\Audio\Mp3::MPEGaudioHeaderBytesValid (   $head4,
  $allowBitrate15 = false 
)
static
Parameters
type$head4
type$allowBitrate15
Returns
type

Definition at line 1930 of file Mp3.php.

1932 {
1933 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4),
1934 false,
1935 $allowBitrate15);
1936 }

References GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

Referenced by GetId3\Module\AudioVideo\Riff\ParseRIFF().

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◆ MPEGaudioHeaderDecode()

static GetId3\Module\Audio\Mp3::MPEGaudioHeaderDecode (   $Header4Bytes)
static
Parameters
type$Header4Bytes
Returns
boolean

Definition at line 2036 of file Mp3.php.

2037 {
2038 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM
2039 // A - Frame sync (all bits set)
2040 // B - MPEG Audio version ID
2041 // C - Layer description
2042 // D - Protection bit
2043 // E - Bitrate index
2044 // F - Sampling rate frequency index
2045 // G - Padding bit
2046 // H - Private bit
2047 // I - Channel Mode
2048 // J - Mode extension (Only if Joint stereo)
2049 // K - Copyright
2050 // L - Original
2051 // M - Emphasis
2052
2053 if (strlen($Header4Bytes) != 4) {
2054 return false;
2055 }
2056
2057 $MPEGrawHeader['synch'] = (Helper::BigEndian2Int(substr($Header4Bytes,
2058 0, 2)) & 0xFFE0) >> 4;
2059 $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB
2060 $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC
2061 $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D
2062 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE
2063 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF
2064 $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G
2065 $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H
2066 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II
2067 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ
2068 $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K
2069 $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L
2070 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM
2071
2072 return $MPEGrawHeader;
2073 }

References GetId3\Lib\Helper\BigEndian2Int().

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), and GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce().

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◆ MPEGaudioHeaderValid()

static GetId3\Module\Audio\Mp3::MPEGaudioHeaderValid (   $rawarray,
  $echoerrors = false,
  $allowBitrate15 = false 
)
static

@staticvar type $MPEGaudioVersionLookup @staticvar type $MPEGaudioLayerLookup @staticvar type $MPEGaudioBitrateLookup @staticvar type $MPEGaudioFrequencyLookup @staticvar type $MPEGaudioChannelModeLookup @staticvar type $MPEGaudioModeExtensionLookup @staticvar type $MPEGaudioEmphasisLookup

Parameters
type$rawarray
type$echoerrors
type$allowBitrate15
Returns
boolean

Definition at line 1952 of file Mp3.php.

1954 {
1955 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) {
1956 return false;
1957 }
1958
1959 static $MPEGaudioVersionLookup;
1960 static $MPEGaudioLayerLookup;
1961 static $MPEGaudioBitrateLookup;
1962 static $MPEGaudioFrequencyLookup;
1963 static $MPEGaudioChannelModeLookup;
1964 static $MPEGaudioModeExtensionLookup;
1965 static $MPEGaudioEmphasisLookup;
1966 if (empty($MPEGaudioVersionLookup)) {
1967 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray();
1968 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray();
1969 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray();
1970 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray();
1971 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray();
1972 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
1973 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray();
1974 }
1975
1976 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) {
1977 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']];
1978 } else {
1979 echo ($echoerrors ? "\n" . 'invalid Version (' . $rawarray['version'] . ')' : '');
1980
1981 return false;
1982 }
1983 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) {
1984 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']];
1985 } else {
1986 echo ($echoerrors ? "\n" . 'invalid Layer (' . $rawarray['layer'] . ')' : '');
1987
1988 return false;
1989 }
1990 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) {
1991 echo ($echoerrors ? "\n" . 'invalid Bitrate (' . $rawarray['bitrate'] . ')' : '');
1992 if ($rawarray['bitrate'] == 15) {
1993 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0
1994 // let it go through here otherwise file will not be identified
1995 if (!$allowBitrate15) {
1996 return false;
1997 }
1998 } else {
1999 return false;
2000 }
2001 }
2002 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) {
2003 echo ($echoerrors ? "\n" . 'invalid Frequency (' . $rawarray['sample_rate'] . ')' : '');
2004
2005 return false;
2006 }
2007 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) {
2008 echo ($echoerrors ? "\n" . 'invalid ChannelMode (' . $rawarray['channelmode'] . ')' : '');
2009
2010 return false;
2011 }
2012 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) {
2013 echo ($echoerrors ? "\n" . 'invalid Mode Extension (' . $rawarray['modeextension'] . ')' : '');
2014
2015 return false;
2016 }
2017 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) {
2018 echo ($echoerrors ? "\n" . 'invalid Emphasis (' . $rawarray['emphasis'] . ')' : '');
2019
2020 return false;
2021 }
2022 // These are just either set or not set, you can't mess that up :)
2023 // $rawarray['protection'];
2024 // $rawarray['padding'];
2025 // $rawarray['private'];
2026 // $rawarray['copyright'];
2027 // $rawarray['original'];
2028 return true;
2029 }

References GetId3\Module\Audio\Mp3\MPEGaudioBitrateArray(), GetId3\Module\Audio\Mp3\MPEGaudioChannelModeArray(), GetId3\Module\Audio\Mp3\MPEGaudioEmphasisArray(), GetId3\Module\Audio\Mp3\MPEGaudioFrequencyArray(), GetId3\Module\Audio\Mp3\MPEGaudioLayerArray(), GetId3\Module\Audio\Mp3\MPEGaudioModeExtensionArray(), and GetId3\Module\Audio\Mp3\MPEGaudioVersionArray().

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderBytesValid().

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◆ MPEGaudioLayerArray()

static GetId3\Module\Audio\Mp3::MPEGaudioLayerArray ( )
static

@staticvar array $MPEGaudioLayer

Returns
boolean

Definition at line 1830 of file Mp3.php.

1831 {
1832 static $MPEGaudioLayer = array(false, 3, 2, 1);
1833
1834 return $MPEGaudioLayer;
1835 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioModeExtensionArray()

static GetId3\Module\Audio\Mp3::MPEGaudioModeExtensionArray ( )
static

@staticvar array $MPEGaudioModeExtension

Returns
array

Definition at line 1898 of file Mp3.php.

1899 {
1900 static $MPEGaudioModeExtension;
1901 if (empty($MPEGaudioModeExtension)) {
1902 $MPEGaudioModeExtension = array(
1903 1 => array('4-31', '8-31', '12-31', '16-31'),
1904 2 => array('4-31', '8-31', '12-31', '16-31'),
1905 3 => array('', 'IS', 'MS', 'IS+MS')
1906 );
1907 }
1908
1909 return $MPEGaudioModeExtension;
1910 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ MPEGaudioVersionArray()

static GetId3\Module\Audio\Mp3::MPEGaudioVersionArray ( )
static

@staticvar array $MPEGaudioVersion

Returns
string

Definition at line 1818 of file Mp3.php.

1819 {
1820 static $MPEGaudioVersion = array('2.5', false, '2', '1');
1821
1822 return $MPEGaudioVersion;
1823 }

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfo(), GetId3\Module\Audio\Mp3\getOnlyMPEGaudioInfoBruteForce(), and GetId3\Module\Audio\Mp3\MPEGaudioHeaderValid().

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◆ RecursiveFrameScanning()

GetId3\Module\Audio\Mp3::RecursiveFrameScanning ( &  $offset,
&  $nextframetestoffset,
  $ScanAsCBR 
)
Parameters
type$offset
type$nextframetestoffset
type$ScanAsCBR
Returns
boolean

Definition at line 1198 of file Mp3.php.

1200 {
1201 $info = &$this->getid3->info;
1202 $firstframetestarray = array('error' => '', 'warning' => '', 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1203 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false);
1204
1205 for ($i = 0; $i < self::GETID3_MP3_VALID_CHECK_FRAMES; $i++) {
1206 // check next self::GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch
1207 if (($nextframetestoffset + 4) >= $info['avdataend']) {
1208 // end of file
1209 return true;
1210 }
1211
1212 $nextframetestarray = array('error' => '', 'warning' => '', 'avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']);
1213 if ($this->decodeMPEGaudioHeader($nextframetestoffset,
1214 $nextframetestarray, false)) {
1215 if ($ScanAsCBR) {
1216 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header
1217 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) {
1218 return false;
1219 }
1220 }
1221
1222 // next frame is OK, get ready to check the one after that
1223 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) {
1224 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength'];
1225 } else {
1226 $info['error'][] = 'Frame at offset (' . $offset . ') is has an invalid frame length.';
1227
1228 return false;
1229 }
1230 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) {
1231
1232 // 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
1233 return true;
1234 } else {
1235
1236 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence
1237 $info['warning'][] = 'Frame at offset (' . $offset . ') is valid, but the next one at (' . $nextframetestoffset . ') is not.';
1238
1239 return false;
1240 }
1241 }
1242
1243 return true;
1244 }
GetId3\Module\Audio\Mp3\GETID3_MP3_VALID_CHECK_FRAMES
const GETID3_MP3_VALID_CHECK_FRAMES
Definition: Mp3.php:46

References $info, GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader(), and GetId3\Module\Audio\Mp3\GETID3_MP3_VALID_CHECK_FRAMES.

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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◆ XingVBRidOffset()

static GetId3\Module\Audio\Mp3::XingVBRidOffset (   $version,
  $channelmode 
)
static

@staticvar array $XingVBRidOffsetCache

Parameters
type$version
type$channelmode
Returns
array

Definition at line 2176 of file Mp3.php.

2177 {
2178 static $XingVBRidOffsetCache = array();
2179 if (empty($XingVBRidOffset)) {
2180 $XingVBRidOffset = array(
2181 '1' => array('mono' => 0x15, // 4 + 17 = 21
2182 'stereo' => 0x24, // 4 + 32 = 36
2183 'joint stereo' => 0x24,
2184 'dual channel' => 0x24
2185 ),
2186 '2' => array('mono' => 0x0D, // 4 + 9 = 13
2187 'stereo' => 0x15, // 4 + 17 = 21
2188 'joint stereo' => 0x15,
2189 'dual channel' => 0x15
2190 ),
2191 '2.5' => array('mono' => 0x15,
2192 'stereo' => 0x15,
2193 'joint stereo' => 0x15,
2194 'dual channel' => 0x15
2195 )
2196 );
2197 }
2198
2199 return $XingVBRidOffset[$version][$channelmode];
2200 }

References $version.

Referenced by GetId3\Module\Audio\Mp3\decodeMPEGaudioHeader().

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Field Documentation

◆ $allow_bruteforce

GetId3\Module\Audio\Mp3::$allow_bruteforce = false

Definition at line 44 of file Mp3.php.

◆ GETID3_MP3_VALID_CHECK_FRAMES

const GetId3\Module\Audio\Mp3::GETID3_MP3_VALID_CHECK_FRAMES = 35

Definition at line 46 of file Mp3.php.

Referenced by GetId3\Module\Audio\Mp3\RecursiveFrameScanning().

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