mambax7 /
xoopseditors
| Total Complexity | 312 |
| Total Lines | 1553 |
| Duplicated Lines | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
Complex classes like getid3_mp3 often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use getid3_mp3, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 24 | class getid3_mp3 extends getid3_handler |
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| 25 | { |
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| 26 | // Number of frames to scan to determine if MPEG-audio sequence is valid. |
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| 27 | // Lower this number to 5-20 for faster scanning |
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| 28 | // Increase this number to 50+ for most accurate detection of valid VBR/CBR mpeg-audio streams |
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| 29 | const VALID_CHECK_FRAMES = 35; |
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| 30 | |||
| 31 | public function Analyze() |
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| 32 | { |
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| 33 | $this->getAllMPEGInfo($this->getid3->fp, $this->getid3->info); |
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| 34 | |||
| 35 | return true; |
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| 36 | } |
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| 37 | |||
| 38 | public function AnalyzeMPEGaudioInfo() |
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| 39 | { |
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| 40 | $this->getOnlyMPEGaudioInfo($this->getid3->fp, $this->getid3->info, $this->getid3->info['avdataoffset'], false); |
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| 41 | } |
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| 42 | |||
| 43 | public function getAllMPEGInfo(&$fd, &$info) |
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| 44 | { |
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| 45 | $this->getOnlyMPEGaudioInfo($fd, $info, 0 + $info['avdataoffset']); |
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| 46 | |||
| 47 | if (isset($info['mpeg']['audio']['bitrate_mode'])) { |
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| 48 | $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); |
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| 49 | } |
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| 50 | |||
| 51 | if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0)))) { |
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| 52 | $synch_offset_warning = 'Unknown data before synch '; |
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| 53 | if (isset($info['id3v2']['headerlength'])) { |
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| 54 | $synch_offset_warning .= '(ID3v2 header ends at ' . $info['id3v2']['headerlength'] . ', then ' . ($info['avdataoffset'] - $info['id3v2']['headerlength']) . ' bytes garbage, '; |
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| 55 | } else { |
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| 56 | $synch_offset_warning .= '(should be at beginning of file, '; |
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| 57 | } |
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| 58 | $synch_offset_warning .= 'synch detected at ' . $info['avdataoffset'] . ')'; |
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| 59 | if ('cbr' == $info['audio']['bitrate_mode']) { |
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| 60 | if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { |
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| 61 | $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; |
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| 62 | $info['audio']['codec'] = 'LAME'; |
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| 63 | $current_data_lame_version_string = 'LAME3.'; |
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| 64 | } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { |
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| 65 | $synch_offset_warning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; |
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| 66 | $info['audio']['codec'] = 'LAME'; |
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| 67 | $current_data_lame_version_string = 'LAME3.'; |
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| 68 | } |
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| 69 | } |
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| 70 | $this->getid3->warning($synch_offset_warning); |
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| 71 | } |
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| 72 | |||
| 73 | if (isset($info['mpeg']['audio']['LAME'])) { |
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| 74 | $info['audio']['codec'] = 'LAME'; |
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| 75 | if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { |
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| 76 | $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); |
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| 77 | } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { |
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| 78 | $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); |
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| 79 | } |
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| 80 | } |
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| 81 | |||
| 82 | $current_data_lame_version_string = (!empty($current_data_lame_version_string) ? $current_data_lame_version_string : @$info['audio']['encoder']); |
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| 83 | if (!empty($current_data_lame_version_string) && ('LAME3.' == substr($current_data_lame_version_string, 0, 6)) && !preg_match('[0-9\)]', substr($current_data_lame_version_string, -1))) { |
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| 84 | // a version number of LAME that does not end with a number like "LAME3.92" |
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| 85 | // or with a closing parenthesis like "LAME3.88 (alpha)" |
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| 86 | // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) |
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| 87 | |||
| 88 | // not sure what the actual last frame length will be, but will be less than or equal to 1441 |
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| 89 | $possibly_longer_lame_version_frame_length = 1441; |
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| 90 | |||
| 91 | // Not sure what version of LAME this is - look in padding of last frame for longer version string |
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| 92 | $possible_lame_version_string_offset = $info['avdataend'] - $possibly_longer_lame_version_frame_length; |
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| 93 | fseek($fd, $possible_lame_version_string_offset); |
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| 94 | $possibly_longer_lame_version_data = fread($fd, $possibly_longer_lame_version_frame_length); |
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| 95 | switch (substr($current_data_lame_version_string, -1)) { |
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| 96 | case 'a': |
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| 97 | case 'b': |
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| 98 | // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example |
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| 99 | // need to trim off "a" to match longer string |
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| 100 | $current_data_lame_version_string = substr($current_data_lame_version_string, 0, -1); |
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| 101 | break; |
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| 102 | } |
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| 103 | if (false !== ($possibly_longer_lame_version_string = strstr($possibly_longer_lame_version_data, $current_data_lame_version_string))) { |
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| 104 | if (substr($possibly_longer_lame_version_string, 0, strlen($current_data_lame_version_string)) == $current_data_lame_version_string) { |
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| 105 | $possibly_longer_lame_version_new_string = substr($possibly_longer_lame_version_string, 0, strspn($possibly_longer_lame_version_string, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" |
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| 106 | if (strlen($possibly_longer_lame_version_new_string) > strlen(@$info['audio']['encoder'])) { |
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| 107 | $info['audio']['encoder'] = $possibly_longer_lame_version_new_string; |
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| 108 | } |
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| 109 | } |
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| 110 | } |
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| 111 | } |
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| 112 | if (!empty($info['audio']['encoder'])) { |
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| 113 | $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); |
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| 114 | } |
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| 115 | |||
| 116 | switch (@$info['mpeg']['audio']['layer']) { |
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| 117 | case 1: |
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| 118 | case 2: |
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| 119 | $info['audio']['dataformat'] = 'mp' . $info['mpeg']['audio']['layer']; |
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| 120 | break; |
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| 121 | } |
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| 122 | if ('mp3' == @$info['fileformat']) { |
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| 123 | switch ($info['audio']['dataformat']) { |
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| 124 | case 'mp1': |
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| 125 | case 'mp2': |
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| 126 | case 'mp3': |
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| 127 | $info['fileformat'] = $info['audio']['dataformat']; |
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| 128 | break; |
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| 129 | |||
| 130 | default: |
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| 131 | $this->getid3->warning('Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "' . $info['audio']['dataformat'] . '"'); |
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| 132 | break; |
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| 133 | } |
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| 134 | } |
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| 135 | |||
| 136 | $info['mime_type'] = 'audio/mpeg'; |
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| 137 | $info['audio']['lossless'] = false; |
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| 138 | |||
| 139 | // Calculate playtime |
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| 140 | if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { |
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| 141 | $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate']; |
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| 142 | } |
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| 143 | |||
| 144 | $info['audio']['encoder_options'] = getid3_mp3::GuessEncoderOptions($info); |
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| 145 | |||
| 146 | return true; |
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| 147 | } |
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| 148 | |||
| 149 | public static function GuessEncoderOptions(&$info) |
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| 150 | { |
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| 151 | // shortcuts |
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| 152 | if (!empty($info['mpeg']['audio'])) { |
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| 153 | $thisfile_mpeg_audio = &$info['mpeg']['audio']; |
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| 154 | if (!empty($thisfile_mpeg_audio['LAME'])) { |
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| 155 | $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; |
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| 156 | } |
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| 157 | } |
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| 158 | |||
| 159 | $encoder_options = ''; |
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| 160 | static $named_preset_bitrates = [16, 24, 40, 56, 112, 128, 160, 192, 256]; |
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| 161 | |||
| 162 | if (('Fraunhofer' == @$thisfile_mpeg_audio['VBR_method']) && !empty($thisfile_mpeg_audio['VBR_quality'])) { |
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|
Comprehensibility
Best Practice
introduced
by
|
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| 163 | $encoder_options = 'VBR q' . $thisfile_mpeg_audio['VBR_quality']; |
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| 164 | } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $named_preset_bitrates))) { |
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| 165 | $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; |
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| 166 | } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { |
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| 167 | static $known_encoder_values = []; |
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| 168 | if (empty($known_encoder_values)) { |
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| 169 | //$known_encoder_values[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; |
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| 170 | $known_encoder_values[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 |
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| 171 | $known_encoder_values[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 |
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| 172 | $known_encoder_values[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 |
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| 173 | $known_encoder_values['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 |
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| 174 | $known_encoder_values['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 |
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| 175 | $known_encoder_values['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 |
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| 176 | $known_encoder_values['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 |
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| 177 | $known_encoder_values['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 |
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| 178 | $known_encoder_values['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 179 | $known_encoder_values['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 |
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| 180 | $known_encoder_values['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 181 | $known_encoder_values['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 |
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| 182 | $known_encoder_values['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 |
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| 183 | $known_encoder_values['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 |
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| 184 | $known_encoder_values['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 |
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| 185 | $known_encoder_values['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 |
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| 186 | $known_encoder_values['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 |
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| 187 | |||
| 188 | $known_encoder_values[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 189 | $known_encoder_values[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 |
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| 190 | $known_encoder_values[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 |
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| 191 | $known_encoder_values[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 |
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| 192 | $known_encoder_values[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 193 | $known_encoder_values[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 |
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| 194 | $known_encoder_values[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 |
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| 195 | $known_encoder_values[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 |
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| 196 | $known_encoder_values[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 197 | $known_encoder_values[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 |
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| 198 | $known_encoder_values[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 |
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| 199 | $known_encoder_values[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 200 | $known_encoder_values[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 201 | $known_encoder_values[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 |
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| 202 | $known_encoder_values[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 |
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| 203 | $known_encoder_values[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 |
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| 204 | $known_encoder_values[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 |
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| 205 | $known_encoder_values[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 |
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| 206 | $known_encoder_values[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 |
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| 207 | $known_encoder_values[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 |
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| 208 | $known_encoder_values[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 |
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| 209 | $known_encoder_values[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 |
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| 210 | $known_encoder_values[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 |
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| 211 | $known_encoder_values[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 |
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| 212 | $known_encoder_values[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 |
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| 213 | $known_encoder_values[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 |
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| 214 | $known_encoder_values[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 |
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| 215 | $known_encoder_values[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 |
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| 216 | $known_encoder_values[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 |
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| 217 | $known_encoder_values[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 |
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| 218 | $known_encoder_values[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 |
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| 219 | $known_encoder_values[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 |
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| 220 | $known_encoder_values[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 |
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| 221 | } |
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| 222 | |||
| 223 | if (isset($known_encoder_values[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$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']])) { |
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| 224 | $encoder_options = $known_encoder_values[$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']]; |
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| 225 | } elseif (isset($known_encoder_values['**'][$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']])) { |
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| 226 | $encoder_options = $known_encoder_values['**'][$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']]; |
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| 227 | } elseif ('vbr' == $info['audio']['bitrate_mode']) { |
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| 228 | // http://gabriel.mp3-tech.org/mp3infotag.html |
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| 229 | // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h |
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| 230 | |||
| 231 | $lame_v_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); |
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| 232 | $lame_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($lame_v_value * 10); |
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| 233 | $encoder_options = '-V' . $lame_v_value . ' -q' . $lame_q_value; |
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| 234 | } elseif ('cbr' == $info['audio']['bitrate_mode']) { |
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| 235 | $encoder_options = strtoupper($info['audio']['bitrate_mode']) . ceil($info['audio']['bitrate'] / 1000); |
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| 236 | } else { |
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| 237 | $encoder_options = strtoupper($info['audio']['bitrate_mode']); |
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| 238 | } |
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| 239 | } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { |
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| 240 | $encoder_options = 'ABR' . $thisfile_mpeg_audio_lame['bitrate_abr']; |
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| 241 | } elseif (!empty($info['audio']['bitrate'])) { |
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| 242 | if ('cbr' == $info['audio']['bitrate_mode']) { |
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| 243 | $encoder_options = strtoupper($info['audio']['bitrate_mode']) . ceil($info['audio']['bitrate'] / 1000); |
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| 244 | } else { |
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| 245 | $encoder_options = strtoupper($info['audio']['bitrate_mode']); |
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| 246 | } |
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| 247 | } |
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| 248 | if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { |
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| 249 | $encoder_options .= ' -b' . $thisfile_mpeg_audio_lame['bitrate_min']; |
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| 250 | } |
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| 251 | |||
| 252 | if (@$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] || @$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']) { |
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| 253 | $encoder_options .= ' --nogap'; |
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| 254 | } |
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| 255 | |||
| 256 | if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { |
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| 257 | $exploded_options = explode(' ', $encoder_options, 4); |
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| 258 | if ('--r3mix' == $exploded_options[0]) { |
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| 259 | $exploded_options[1] = 'r3mix'; |
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| 260 | } |
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| 261 | switch ($exploded_options[0]) { |
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| 262 | case '--preset': |
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| 263 | case '--alt-preset': |
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| 264 | case '--r3mix': |
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| 265 | if ('fast' == $exploded_options[1]) { |
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| 266 | $exploded_options[1] .= ' ' . $exploded_options[2]; |
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| 267 | } |
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| 268 | switch ($exploded_options[1]) { |
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| 269 | case 'portable': |
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| 270 | case 'medium': |
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| 271 | case 'standard': |
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| 272 | case 'extreme': |
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| 273 | case 'insane': |
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| 274 | case 'fast portable': |
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| 275 | case 'fast medium': |
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| 276 | case 'fast standard': |
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| 277 | case 'fast extreme': |
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| 278 | case 'fast insane': |
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| 279 | case 'r3mix': |
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| 280 | static $expected_lowpass = [ |
||
| 281 | 'insane|20500' => 20500, |
||
| 282 | 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 |
||
| 283 | 'medium|18000' => 18000, |
||
| 284 | 'fast medium|18000' => 18000, |
||
| 285 | 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
||
| 286 | 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
||
| 287 | 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 |
||
| 288 | 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 |
||
| 289 | 'standard|19000' => 19000, |
||
| 290 | 'fast standard|19000' => 19000, |
||
| 291 | 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 |
||
| 292 | 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 |
||
| 293 | 'r3mix|18000' => 18000, // 3.94, 3.95 |
||
| 294 | ]; |
||
| 295 | if (!isset($expected_lowpass[$exploded_options[1] . '|' . $thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) |
||
| 296 | && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round( |
||
| 297 | $thisfile_mpeg_audio['sample_rate'] / 2000 |
||
| 298 | ))) { |
||
| 299 | $encoder_options .= ' --lowpass ' . $thisfile_mpeg_audio_lame['lowpass_frequency']; |
||
| 300 | } |
||
| 301 | break; |
||
| 302 | |||
| 303 | default: |
||
| 304 | break; |
||
| 305 | } |
||
| 306 | break; |
||
| 307 | } |
||
| 308 | } |
||
| 309 | |||
| 310 | if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { |
||
| 311 | if ((44100 == $thisfile_mpeg_audio['sample_rate']) && (1 != $thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { |
||
| 312 | $encoder_options .= ' --resample 44100'; |
||
| 313 | } elseif ((48000 == $thisfile_mpeg_audio['sample_rate']) && (2 != $thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { |
||
| 314 | $encoder_options .= ' --resample 48000'; |
||
| 315 | } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { |
||
| 316 | switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { |
||
| 317 | case 0: // <= 32000 |
||
| 318 | // may or may not be same as source frequency - ignore |
||
| 319 | break; |
||
| 320 | case 1: // 44100 |
||
| 321 | case 2: // 48000 |
||
| 322 | case 3: // 48000+ |
||
| 323 | $exploded_options = explode(' ', $encoder_options, 4); |
||
| 324 | switch ($exploded_options[0]) { |
||
| 325 | case '--preset': |
||
| 326 | case '--alt-preset': |
||
| 327 | switch ($exploded_options[1]) { |
||
| 328 | case 'fast': |
||
| 329 | case 'portable': |
||
| 330 | case 'medium': |
||
| 331 | case 'standard': |
||
| 332 | case 'extreme': |
||
| 333 | case 'insane': |
||
| 334 | $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate']; |
||
| 335 | break; |
||
| 336 | |||
| 337 | default: |
||
| 338 | static $expected_resampled_rate = [ |
||
| 339 | 'phon+/lw/mw-eu/sw|16000' => 16000, |
||
| 340 | 'mw-us|24000' => 24000, // 3.95 |
||
| 341 | 'mw-us|32000' => 32000, // 3.93 |
||
| 342 | 'mw-us|16000' => 16000, // 3.92 |
||
| 343 | 'phone|16000' => 16000, |
||
| 344 | 'phone|11025' => 11025, // 3.94a15 |
||
| 345 | 'radio|32000' => 32000, // 3.94a15 |
||
| 346 | 'fm/radio|32000' => 32000, // 3.92 |
||
| 347 | 'fm|32000' => 32000, // 3.90 |
||
| 348 | 'voice|32000' => 32000 |
||
| 349 | ]; |
||
| 350 | if (!isset($expected_resampled_rate[$exploded_options[1] . '|' . $thisfile_mpeg_audio['sample_rate']])) { |
||
| 351 | $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate']; |
||
| 352 | } |
||
| 353 | break; |
||
| 354 | } |
||
| 355 | break; |
||
| 356 | |||
| 357 | case '--r3mix': |
||
| 358 | default: |
||
| 359 | $encoder_options .= ' --resample ' . $thisfile_mpeg_audio['sample_rate']; |
||
| 360 | break; |
||
| 361 | } |
||
| 362 | break; |
||
| 363 | } |
||
| 364 | } |
||
| 365 | } |
||
| 366 | if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { |
||
| 367 | //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); |
||
| 368 | $encoder_options = strtoupper($info['audio']['bitrate_mode']); |
||
| 369 | } |
||
| 370 | |||
| 371 | return $encoder_options; |
||
| 372 | } |
||
| 373 | |||
| 374 | public function decodeMPEGaudioHeader($fd, $offset, &$info, $recursive_search = true, $scan_as_cbr = false, $fast_mpeg_header_scan = false) |
||
| 375 | { |
||
| 376 | static $mpeg_audio_version_lookup; |
||
| 377 | static $mpeg_audio_layer_lookup; |
||
| 378 | static $mpeg_audio_bitrate_lookup; |
||
| 379 | static $mpeg_audio_frequency_lookup; |
||
| 380 | static $mpeg_audio_channel_mode_lookup; |
||
| 381 | static $mpeg_audio_mode_extension_lookup; |
||
| 382 | static $mpeg_audio_emphasis_lookup; |
||
| 383 | if (empty($mpeg_audio_version_lookup)) { |
||
| 384 | $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
||
| 385 | $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
||
| 386 | $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
||
| 387 | $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); |
||
| 388 | $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); |
||
| 389 | $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); |
||
| 390 | $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); |
||
| 391 | } |
||
| 392 | |||
| 393 | if ($offset >= $info['avdataend']) { |
||
| 394 | // non-fatal error: 'end of file encounter looking for MPEG synch' |
||
| 395 | return; |
||
| 396 | } |
||
| 397 | fseek($fd, $offset, SEEK_SET); |
||
| 398 | $header_string = fread($fd, 226); // LAME header at offset 36 + 190 bytes of Xing/LAME data |
||
| 399 | |||
| 400 | // MP3 audio frame structure: |
||
| 401 | // $aa $aa $aa $aa [$bb $bb] $cc... |
||
| 402 | // where $aa..$aa is the four-byte mpeg-audio header (below) |
||
| 403 | // $bb $bb is the optional 2-byte CRC |
||
| 404 | // and $cc... is the audio data |
||
| 405 | |||
| 406 | $head4 = substr($header_string, 0, 4); |
||
| 407 | |||
| 408 | if (isset($mpeg_audio_header_decode_cache[$head4])) { |
||
| 409 | $mpeg_header_raw_array = $mpeg_audio_header_decode_cache[$head4]; |
||
| 410 | } else { |
||
| 411 | $mpeg_header_raw_array = getid3_mp3::MPEGaudioHeaderDecode($head4); |
||
| 412 | $mpeg_audio_header_decode_cache[$head4] = $mpeg_header_raw_array; |
||
| 413 | } |
||
| 414 | |||
| 415 | // Not in cache |
||
| 416 | if (!isset($mpeg_audio_header_valid_cache[$head4])) { |
||
| 417 | $mpeg_audio_header_valid_cache[$head4] = getid3_mp3::MPEGaudioHeaderValid($mpeg_header_raw_array, false, false); |
||
| 418 | } |
||
| 419 | |||
| 420 | // shortcut |
||
| 421 | if (!isset($info['mpeg']['audio'])) { |
||
| 422 | $info['mpeg']['audio'] = []; |
||
| 423 | } |
||
| 424 | $thisfile_mpeg_audio = &$info['mpeg']['audio']; |
||
| 425 | |||
| 426 | if ($mpeg_audio_header_valid_cache[$head4]) { |
||
| 427 | $thisfile_mpeg_audio['raw'] = $mpeg_header_raw_array; |
||
| 428 | } else { |
||
| 429 | // non-fatal error: Invalid MPEG audio header at offset $offset |
||
| 430 | return; |
||
| 431 | } |
||
| 432 | |||
| 433 | if (!$fast_mpeg_header_scan) { |
||
| 434 | $thisfile_mpeg_audio['version'] = $mpeg_audio_version_lookup[$thisfile_mpeg_audio['raw']['version']]; |
||
| 435 | $thisfile_mpeg_audio['layer'] = $mpeg_audio_layer_lookup[$thisfile_mpeg_audio['raw']['layer']]; |
||
| 436 | |||
| 437 | $thisfile_mpeg_audio['channelmode'] = $mpeg_audio_channel_mode_lookup[$thisfile_mpeg_audio['raw']['channelmode']]; |
||
| 438 | $thisfile_mpeg_audio['channels'] = (('mono' == $thisfile_mpeg_audio['channelmode']) ? 1 : 2); |
||
| 439 | $thisfile_mpeg_audio['sample_rate'] = $mpeg_audio_frequency_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; |
||
| 440 | $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; |
||
| 441 | $thisfile_mpeg_audio['private'] = (bool)$thisfile_mpeg_audio['raw']['private']; |
||
| 442 | $thisfile_mpeg_audio['modeextension'] = $mpeg_audio_mode_extension_lookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; |
||
| 443 | $thisfile_mpeg_audio['copyright'] = (bool)$thisfile_mpeg_audio['raw']['copyright']; |
||
| 444 | $thisfile_mpeg_audio['original'] = (bool)$thisfile_mpeg_audio['raw']['original']; |
||
| 445 | $thisfile_mpeg_audio['emphasis'] = $mpeg_audio_emphasis_lookup[$thisfile_mpeg_audio['raw']['emphasis']]; |
||
| 446 | |||
| 447 | $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; |
||
| 448 | $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; |
||
| 449 | |||
| 450 | if ($thisfile_mpeg_audio['protection']) { |
||
| 451 | $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($header_string, 4, 2)); |
||
| 452 | } |
||
| 453 | } |
||
| 454 | |||
| 455 | if (15 == $thisfile_mpeg_audio['raw']['bitrate']) { |
||
| 456 | // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 |
||
| 457 | $this->getid3->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'); |
||
| 458 | $thisfile_mpeg_audio['raw']['bitrate'] = 0; |
||
| 459 | } |
||
| 460 | $thisfile_mpeg_audio['padding'] = (bool)$thisfile_mpeg_audio['raw']['padding']; |
||
| 461 | $thisfile_mpeg_audio['bitrate'] = $mpeg_audio_bitrate_lookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; |
||
| 462 | |||
| 463 | if (('free' == $thisfile_mpeg_audio['bitrate']) && ($offset == $info['avdataoffset'])) { |
||
| 464 | // only skip multiple frame check if free-format bitstream found at beginning of file |
||
| 465 | // otherwise is quite possibly simply corrupted data |
||
| 466 | $recursive_search = false; |
||
| 467 | } |
||
| 468 | |||
| 469 | // For Layer 2 there are some combinations of bitrate and mode which are not allowed. |
||
| 470 | if (!$fast_mpeg_header_scan && ('2' == $thisfile_mpeg_audio['layer'])) { |
||
| 471 | $info['audio']['dataformat'] = 'mp2'; |
||
| 472 | switch ($thisfile_mpeg_audio['channelmode']) { |
||
| 473 | case 'mono': |
||
| 474 | if (('free' == $thisfile_mpeg_audio['bitrate']) || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { |
||
| 475 | // these are ok |
||
| 476 | } else { |
||
| 477 | // non-fatal error: bitrate not allowed in Layer 2/mono |
||
| 478 | return; |
||
| 479 | } |
||
| 480 | break; |
||
| 481 | |||
| 482 | case 'stereo': |
||
| 483 | case 'joint stereo': |
||
| 484 | case 'dual channel': |
||
| 485 | if (('free' == $thisfile_mpeg_audio['bitrate']) || (64000 == $thisfile_mpeg_audio['bitrate']) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { |
||
| 486 | // these are ok |
||
| 487 | } else { |
||
| 488 | // non-fatal error: bitrate not allowed in Layer 2/stereo/joint stereo/dual channel |
||
| 489 | return; |
||
| 490 | } |
||
| 491 | break; |
||
| 492 | } |
||
| 493 | } |
||
| 494 | |||
| 495 | if ($info['audio']['sample_rate'] > 0) { |
||
| 496 | $thisfile_mpeg_audio['framelength'] = getid3_mp3::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int)$thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); |
||
| 497 | } |
||
| 498 | |||
| 499 | $next_frame_test_offset = $offset + 1; |
||
| 500 | if ('free' != $thisfile_mpeg_audio['bitrate']) { |
||
| 501 | $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
||
| 502 | |||
| 503 | if (isset($thisfile_mpeg_audio['framelength'])) { |
||
| 504 | $next_frame_test_offset = $offset + $thisfile_mpeg_audio['framelength']; |
||
| 505 | } else { |
||
| 506 | // non-fatal error: Frame at offset('.$offset.') is has an invalid frame length. |
||
| 507 | return; |
||
| 508 | } |
||
| 509 | } |
||
| 510 | |||
| 511 | $expected_number_of_audio_bytes = 0; |
||
| 512 | |||
| 513 | //////////////////////////////////////////////////////////////////////////////////// |
||
| 514 | // Variable-bitrate headers |
||
| 515 | |||
| 516 | if ('VBRI' == substr($header_string, 4 + 32, 4)) { |
||
| 517 | // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) |
||
| 518 | // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html |
||
| 519 | |||
| 520 | $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
||
| 521 | $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; |
||
| 522 | $info['audio']['codec'] = 'Fraunhofer'; |
||
| 523 | |||
| 524 | $side_info_data = substr($header_string, 4 + 2, 32); |
||
| 525 | |||
| 526 | $fraunhofer_vbr_offset = 36; |
||
| 527 | |||
| 528 | $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 4, 2)); // VbriVersion |
||
| 529 | $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 6, 2)); // VbriDelay |
||
| 530 | $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 8, 2)); // VbriQuality |
||
| 531 | $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 10, 4)); // VbriStreamBytes |
||
| 532 | $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 14, 4)); // VbriStreamFrames |
||
| 533 | $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 18, 2)); // VbriTableSize |
||
| 534 | $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 20, 2)); // VbriTableScale |
||
| 535 | $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 22, 2)); // VbriEntryBytes |
||
| 536 | $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset + 24, 2)); // VbriEntryFrames |
||
| 537 | |||
| 538 | $expected_number_of_audio_bytes = $thisfile_mpeg_audio['VBR_bytes']; |
||
| 539 | |||
| 540 | $previous_byte_offset = $offset; |
||
| 541 | for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { |
||
| 542 | $fraunhofer_offset_n = getid3_lib::BigEndian2Int(substr($header_string, $fraunhofer_vbr_offset, $thisfile_mpeg_audio['VBR_entry_bytes'])); |
||
| 543 | $fraunhofer_vbr_offset += $thisfile_mpeg_audio['VBR_entry_bytes']; |
||
| 544 | $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']); |
||
| 545 | $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($fraunhofer_offset_n * $thisfile_mpeg_audio['VBR_seek_scale']) + $previous_byte_offset; |
||
| 546 | $previous_byte_offset += $fraunhofer_offset_n; |
||
| 547 | } |
||
| 548 | } else { |
||
| 549 | // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) |
||
| 550 | // depending on MPEG layer and number of channels |
||
| 551 | |||
| 552 | $vbr_id_offset = getid3_mp3::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); |
||
| 553 | $side_info_data = substr($header_string, 4 + 2, $vbr_id_offset - 4); |
||
| 554 | |||
| 555 | if (('Xing' == substr($header_string, $vbr_id_offset, strlen('Xing'))) || ('Info' == substr($header_string, $vbr_id_offset, strlen('Info')))) { |
||
| 556 | // 'Xing' is traditional Xing VBR frame |
||
| 557 | // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) |
||
| 558 | // 'Info' *can* legally be used to specify a VBR file as well, however. |
||
| 559 | |||
| 560 | // http://www.multiweb.cz/twoinches/MP3inside.htm |
||
| 561 | //00..03 = "Xing" or "Info" |
||
| 562 | //04..07 = Flags: |
||
| 563 | // 0x01 Frames Flag set if value for number of frames in file is stored |
||
| 564 | // 0x02 Bytes Flag set if value for filesize in bytes is stored |
||
| 565 | // 0x04 TOC Flag set if values for TOC are stored |
||
| 566 | // 0x08 VBR Scale Flag set if values for VBR scale is stored |
||
| 567 | //08..11 Frames: Number of frames in file (including the first Xing/Info one) |
||
| 568 | //12..15 Bytes: File length in Bytes |
||
| 569 | //16..115 TOC (Table of Contents): |
||
| 570 | // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. |
||
| 571 | // Each Byte has a value according this formula: |
||
| 572 | // (TOC[i] / 256) * fileLenInBytes |
||
| 573 | // 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: |
||
| 574 | // TOC[(60/240)*100] = TOC[25] |
||
| 575 | // and corresponding Byte in file is then approximately at: |
||
| 576 | // (TOC[25]/256) * 5000000 |
||
| 577 | //116..119 VBR Scale |
||
| 578 | |||
| 579 | // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME |
||
| 580 | $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
||
| 581 | $thisfile_mpeg_audio['VBR_method'] = 'Xing'; |
||
| 582 | |||
| 583 | $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 4, 4)); |
||
| 584 | |||
| 585 | $thisfile_mpeg_audio['xing_flags']['frames'] = (bool)($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); |
||
| 586 | $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool)($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); |
||
| 587 | $thisfile_mpeg_audio['xing_flags']['toc'] = (bool)($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); |
||
| 588 | $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool)($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); |
||
| 589 | |||
| 590 | if ($thisfile_mpeg_audio['xing_flags']['frames']) { |
||
| 591 | $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 8, 4)); |
||
| 592 | } |
||
| 593 | if ($thisfile_mpeg_audio['xing_flags']['bytes']) { |
||
| 594 | $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 12, 4)); |
||
| 595 | } |
||
| 596 | |||
| 597 | if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { |
||
| 598 | $frame_lengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; |
||
| 599 | |||
| 600 | if ('1' == $thisfile_mpeg_audio['layer']) { |
||
| 601 | // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
||
| 602 | $info['audio']['bitrate'] = ($frame_lengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; |
||
| 603 | } else { |
||
| 604 | // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
||
| 605 | $info['audio']['bitrate'] = $frame_lengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; |
||
| 606 | } |
||
| 607 | $thisfile_mpeg_audio['framelength'] = floor($frame_lengthfloat); |
||
| 608 | } |
||
| 609 | |||
| 610 | if ($thisfile_mpeg_audio['xing_flags']['toc']) { |
||
| 611 | $lame_toc_data = substr($header_string, $vbr_id_offset + 16, 100); |
||
| 612 | for ($i = 0; $i < 100; $i++) { |
||
| 613 | $thisfile_mpeg_audio['toc'][$i] = ord($lame_toc_data{$i}); |
||
| 614 | } |
||
| 615 | } |
||
| 616 | if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { |
||
| 617 | $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($header_string, $vbr_id_offset + 116, 4)); |
||
| 618 | } |
||
| 619 | |||
| 620 | // http://gabriel.mp3-tech.org/mp3infotag.html |
||
| 621 | if ('LAME' == substr($header_string, $vbr_id_offset + 120, 4)) { |
||
| 622 | // shortcut |
||
| 623 | $thisfile_mpeg_audio['LAME'] = []; |
||
| 624 | $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; |
||
| 625 | |||
| 626 | $thisfile_mpeg_audio_lame['long_version'] = substr($header_string, $vbr_id_offset + 120, 20); |
||
| 627 | $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); |
||
| 628 | |||
| 629 | if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { |
||
| 630 | // extra 11 chars are not part of version string when LAMEtag present |
||
| 631 | unset($thisfile_mpeg_audio_lame['long_version']); |
||
| 632 | |||
| 633 | // It the LAME tag was only introduced in LAME v3.90 |
||
| 634 | // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 |
||
| 635 | |||
| 636 | // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html |
||
| 637 | // are assuming a 'Xing' identifier offset of 0x24, which is the case for |
||
| 638 | // MPEG-1 non-mono, but not for other combinations |
||
| 639 | $lame_tag_offset_contant = $vbr_id_offset - 0x24; |
||
| 640 | |||
| 641 | // shortcuts |
||
| 642 | $thisfile_mpeg_audio_lame['RGAD'] = ['track' => [], 'album' => []]; |
||
| 643 | $thisfile_mpeg_audio_lame_rgad = &$thisfile_mpeg_audio_lame['RGAD']; |
||
| 644 | $thisfile_mpeg_audio_lame_rgad_track = &$thisfile_mpeg_audio_lame_rgad['track']; |
||
| 645 | $thisfile_mpeg_audio_lame_rgad_album = &$thisfile_mpeg_audio_lame_rgad['album']; |
||
| 646 | $thisfile_mpeg_audio_lame['raw'] = []; |
||
| 647 | $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; |
||
| 648 | |||
| 649 | // byte $9B VBR Quality |
||
| 650 | // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. |
||
| 651 | // Actually overwrites original Xing bytes |
||
| 652 | unset($thisfile_mpeg_audio['VBR_scale']); |
||
| 653 | $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0x9B, 1)); |
||
| 654 | |||
| 655 | // bytes $9C-$A4 Encoder short VersionString |
||
| 656 | $thisfile_mpeg_audio_lame['short_version'] = substr($header_string, $lame_tag_offset_contant + 0x9C, 9); |
||
| 657 | |||
| 658 | // byte $A5 Info Tag revision + VBR method |
||
| 659 | $lame_tagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA5, 1)); |
||
| 660 | |||
| 661 | $thisfile_mpeg_audio_lame['tag_revision'] = ($lame_tagRevisionVBRmethod & 0xF0) >> 4; |
||
| 662 | $thisfile_mpeg_audio_lame_raw['vbr_method'] = $lame_tagRevisionVBRmethod & 0x0F; |
||
| 663 | $thisfile_mpeg_audio_lame['vbr_method'] = getid3_mp3::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); |
||
| 664 | $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' |
||
| 665 | |||
| 666 | // byte $A6 Lowpass filter value |
||
| 667 | $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA6, 1)) * 100; |
||
| 668 | |||
| 669 | // bytes $A7-$AE Replay Gain |
||
| 670 | // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html |
||
| 671 | // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" |
||
| 672 | if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { |
||
| 673 | // LAME 3.94a16 and later - 9.23 fixed point |
||
| 674 | // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 |
||
| 675 | $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = (float)((getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xA7, 4))) / 8388608); |
||
| 676 | } else { |
||
| 677 | // LAME 3.94a15 and earlier - 32-bit floating point |
||
| 678 | // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 |
||
| 679 | $thisfile_mpeg_audio_lame_rgad['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($header_string, $lame_tag_offset_contant + 0xA7, 4)); |
||
| 680 | } |
||
| 681 | if (0 == $thisfile_mpeg_audio_lame_rgad['peak_amplitude']) { |
||
| 682 | unset($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); |
||
| 683 | } else { |
||
| 684 | $thisfile_mpeg_audio_lame_rgad['peak_db'] = 20 * log10($thisfile_mpeg_audio_lame_rgad['peak_amplitude']); |
||
| 685 | } |
||
| 686 | |||
| 687 | $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAB, 2)); |
||
| 688 | $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAD, 2)); |
||
| 689 | |||
| 690 | if (0 != $thisfile_mpeg_audio_lame_raw['RGAD_track']) { |
||
| 691 | $thisfile_mpeg_audio_lame_rgad_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; |
||
| 692 | $thisfile_mpeg_audio_lame_rgad_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; |
||
| 693 | $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; |
||
| 694 | $thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; |
||
| 695 | $thisfile_mpeg_audio_lame_rgad_track['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['name']); |
||
| 696 | $thisfile_mpeg_audio_lame_rgad_track['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['originator']); |
||
| 697 | $thisfile_mpeg_audio_lame_rgad_track['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_track['raw']['sign_bit']); |
||
| 698 | |||
| 699 | if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { |
||
| 700 | $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; |
||
| 701 | } |
||
| 702 | $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_rgad_track['originator']; |
||
| 703 | $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_track['gain_db']; |
||
| 704 | } else { |
||
| 705 | unset($thisfile_mpeg_audio_lame_rgad['track']); |
||
| 706 | } |
||
| 707 | if (0 != $thisfile_mpeg_audio_lame_raw['RGAD_album']) { |
||
| 708 | $thisfile_mpeg_audio_lame_rgad_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; |
||
| 709 | $thisfile_mpeg_audio_lame_rgad_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; |
||
| 710 | $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; |
||
| 711 | $thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; |
||
| 712 | $thisfile_mpeg_audio_lame_rgad_album['name'] = getid3_lib_replaygain::NameLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['name']); |
||
| 713 | $thisfile_mpeg_audio_lame_rgad_album['originator'] = getid3_lib_replaygain::OriginatorLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['originator']); |
||
| 714 | $thisfile_mpeg_audio_lame_rgad_album['gain_db'] = getid3_lib_replaygain::AdjustmentLookup($thisfile_mpeg_audio_lame_rgad_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_rgad_album['raw']['sign_bit']); |
||
| 715 | |||
| 716 | if (!empty($thisfile_mpeg_audio_lame_rgad['peak_amplitude'])) { |
||
| 717 | $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_rgad['peak_amplitude']; |
||
| 718 | } |
||
| 719 | $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_rgad_album['originator']; |
||
| 720 | $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_rgad_album['gain_db']; |
||
| 721 | } else { |
||
| 722 | unset($thisfile_mpeg_audio_lame_rgad['album']); |
||
| 723 | } |
||
| 724 | if (empty($thisfile_mpeg_audio_lame_rgad)) { |
||
| 725 | unset($thisfile_mpeg_audio_lame['RGAD']); |
||
| 726 | } |
||
| 727 | |||
| 728 | // byte $AF Encoding flags + ATH Type |
||
| 729 | $encoding_flags_ath_type = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xAF, 1)); |
||
| 730 | $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool)($encoding_flags_ath_type & 0x10); |
||
| 731 | $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool)($encoding_flags_ath_type & 0x20); |
||
| 732 | $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool)($encoding_flags_ath_type & 0x40); |
||
| 733 | $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool)($encoding_flags_ath_type & 0x80); |
||
| 734 | $thisfile_mpeg_audio_lame['ath_type'] = $encoding_flags_ath_type & 0x0F; |
||
| 735 | |||
| 736 | // byte $B0 if ABR {specified bitrate} else {minimal bitrate} |
||
| 737 | $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB0, 1)); |
||
| 738 | if (2 == $thisfile_mpeg_audio_lame_raw['vbr_method']) { // Average BitRate (ABR) |
||
| 739 | $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
||
| 740 | } elseif (1 == $thisfile_mpeg_audio_lame_raw['vbr_method']) { // Constant BitRate (CBR) |
||
| 741 | // ignore |
||
| 742 | } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate |
||
| 743 | $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; |
||
| 744 | } |
||
| 745 | |||
| 746 | // bytes $B1-$B3 Encoder delays |
||
| 747 | $encoder_delays = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB1, 3)); |
||
| 748 | $thisfile_mpeg_audio_lame['encoder_delay'] = ($encoder_delays & 0xFFF000) >> 12; |
||
| 749 | $thisfile_mpeg_audio_lame['end_padding'] = $encoder_delays & 0x000FFF; |
||
| 750 | |||
| 751 | // byte $B4 Misc |
||
| 752 | $misc_byte = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB4, 1)); |
||
| 753 | $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($misc_byte & 0x03); |
||
| 754 | $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($misc_byte & 0x1C) >> 2; |
||
| 755 | $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($misc_byte & 0x20) >> 5; |
||
| 756 | $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($misc_byte & 0xC0) >> 6; |
||
| 757 | $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; |
||
| 758 | $thisfile_mpeg_audio_lame['stereo_mode'] = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); |
||
| 759 | $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool)$thisfile_mpeg_audio_lame_raw['not_optimal_quality']; |
||
| 760 | $thisfile_mpeg_audio_lame['source_sample_freq'] = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); |
||
| 761 | |||
| 762 | // byte $B5 MP3 Gain |
||
| 763 | $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB5, 1), false, true); |
||
| 764 | $thisfile_mpeg_audio_lame['mp3_gain_db'] = (20 * log10(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; |
||
| 765 | $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); |
||
| 766 | |||
| 767 | // bytes $B6-$B7 Preset and surround info |
||
| 768 | $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB6, 2)); |
||
| 769 | // Reserved = ($PresetSurroundBytes & 0xC000); |
||
| 770 | $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); |
||
| 771 | $thisfile_mpeg_audio_lame['surround_info'] = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); |
||
| 772 | $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); |
||
| 773 | $thisfile_mpeg_audio_lame['preset_used'] = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); |
||
| 774 | if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { |
||
| 775 | $this->getid3->warning('Unknown LAME preset used (' . $thisfile_mpeg_audio_lame['preset_used_id'] . ') - please report to [email protected]'); |
||
| 776 | } |
||
| 777 | if (('LAME3.90.' == $thisfile_mpeg_audio_lame['short_version']) && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { |
||
| 778 | // this may change if 3.90.4 ever comes out |
||
| 779 | $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; |
||
| 780 | } |
||
| 781 | |||
| 782 | // bytes $B8-$BB MusicLength |
||
| 783 | $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xB8, 4)); |
||
| 784 | $expected_number_of_audio_bytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); |
||
| 785 | |||
| 786 | // bytes $BC-$BD MusicCRC |
||
| 787 | $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBC, 2)); |
||
| 788 | |||
| 789 | // bytes $BE-$BF CRC-16 of Info Tag |
||
| 790 | $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($header_string, $lame_tag_offset_contant + 0xBE, 2)); |
||
| 791 | |||
| 792 | // LAME CBR |
||
| 793 | if (1 == $thisfile_mpeg_audio_lame_raw['vbr_method']) { |
||
| 794 | $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
||
| 795 | $thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); |
||
| 796 | $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; |
||
| 797 | } |
||
| 798 | } |
||
| 799 | } |
||
| 800 | } else { |
||
| 801 | // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) |
||
| 802 | $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
||
| 803 | if ($recursive_search) { |
||
| 804 | $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; |
||
| 805 | if (getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, true)) { |
||
| 806 | $recursive_search = false; |
||
| 807 | $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; |
||
| 808 | } |
||
| 809 | if ('vbr' == $thisfile_mpeg_audio['bitrate_mode']) { |
||
| 810 | $this->getid3->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'); |
||
| 811 | } |
||
| 812 | } |
||
| 813 | } |
||
| 814 | } |
||
| 815 | |||
| 816 | if (($expected_number_of_audio_bytes > 0) && ($expected_number_of_audio_bytes != ($info['avdataend'] - $info['avdataoffset']))) { |
||
| 817 | if ($expected_number_of_audio_bytes > ($info['avdataend'] - $info['avdataoffset'])) { |
||
| 818 | if (1 == ($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset']))) { |
||
| 819 | $this->getid3->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); |
||
| 820 | } else { |
||
| 821 | $this->getid3->warning( |
||
| 822 | 'Probable truncated file: expecting ' . $expected_number_of_audio_bytes . ' bytes of audio data, only found ' . ($info['avdataend'] - $info['avdataoffset']) . ' (short by ' . ($expected_number_of_audio_bytes - ($info['avdataend'] - $info['avdataoffset'])) . ' bytes)' |
||
| 823 | ); |
||
| 824 | } |
||
| 825 | } else { |
||
| 826 | if (1 == (($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes)) { |
||
| 827 | $info['avdataend']--; |
||
| 828 | } else { |
||
| 829 | $this->getid3->warning( |
||
| 830 | 'Too much data in file: expecting ' . $expected_number_of_audio_bytes . ' bytes of audio data, found ' . ($info['avdataend'] - $info['avdataoffset']) . ' (' . (($info['avdataend'] - $info['avdataoffset']) - $expected_number_of_audio_bytes) . ' bytes too many)' |
||
| 831 | ); |
||
| 832 | } |
||
| 833 | } |
||
| 834 | } |
||
| 835 | |||
| 836 | if (('free' == $thisfile_mpeg_audio['bitrate']) && empty($info['audio']['bitrate'])) { |
||
| 837 | if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { |
||
| 838 | $frame_byte_length = getid3_mp3::FreeFormatFrameLength($fd, $offset, $info, true); |
||
| 839 | if ($frame_byte_length > 0) { |
||
| 840 | $thisfile_mpeg_audio['framelength'] = $frame_byte_length; |
||
| 841 | if ('1' == $thisfile_mpeg_audio['layer']) { |
||
| 842 | // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 |
||
| 843 | $info['audio']['bitrate'] = ((($frame_byte_length / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; |
||
| 844 | } else { |
||
| 845 | // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 |
||
| 846 | $info['audio']['bitrate'] = (($frame_byte_length - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; |
||
| 847 | } |
||
| 848 | } else { |
||
| 849 | // non-fatal error: Error calculating frame length of free-format MP3 without Xing/LAME header. |
||
| 850 | return; |
||
| 851 | } |
||
| 852 | } |
||
| 853 | } |
||
| 854 | |||
| 855 | if (@$thisfile_mpeg_audio['VBR_frames']) { |
||
| 856 | switch ($thisfile_mpeg_audio['bitrate_mode']) { |
||
| 857 | case 'vbr': |
||
| 858 | case 'abr': |
||
| 859 | if (('1' == $thisfile_mpeg_audio['version']) && (1 == $thisfile_mpeg_audio['layer'])) { |
||
| 860 | $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 384); |
||
| 861 | } elseif ((('2' == $thisfile_mpeg_audio['version']) || ('2.5' == $thisfile_mpeg_audio['version'])) && (3 == $thisfile_mpeg_audio['layer'])) { |
||
| 862 | $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 576); |
||
| 863 | } else { |
||
| 864 | $thisfile_mpeg_audio['VBR_bitrate'] = ((@$thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / 1152); |
||
| 865 | } |
||
| 866 | if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { |
||
| 867 | $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; |
||
| 868 | $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion |
||
| 869 | } |
||
| 870 | break; |
||
| 871 | } |
||
| 872 | } |
||
| 873 | |||
| 874 | // End variable-bitrate headers |
||
| 875 | //////////////////////////////////////////////////////////////////////////////////// |
||
| 876 | |||
| 877 | if ($recursive_search) { |
||
| 878 | if (!getid3_mp3::RecursiveFrameScanning($fd, $info, $offset, $next_frame_test_offset, $scan_as_cbr)) { |
||
| 879 | return false; |
||
| 880 | } |
||
| 881 | } |
||
| 882 | |||
| 883 | return true; |
||
| 884 | } |
||
| 885 | |||
| 886 | public function RecursiveFrameScanning(&$fd, &$info, &$offset, &$next_frame_test_offset, $scan_as_cbr) |
||
| 887 | { |
||
| 888 | for ($i = 0; $i < getid3_mp3::VALID_CHECK_FRAMES; $i++) { |
||
| 889 | // check next getid3_mp3::VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch |
||
| 890 | if (($next_frame_test_offset + 4) >= $info['avdataend']) { |
||
| 891 | // end of file |
||
| 892 | return true; |
||
| 893 | } |
||
| 894 | |||
| 895 | $next_frame_test_array = ['avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']]; |
||
| 896 | if ($this->decodeMPEGaudioHeader($fd, $next_frame_test_offset, $next_frame_test_array, false)) { |
||
| 897 | if ($scan_as_cbr) { |
||
| 898 | // force CBR mode, used for trying to pick out invalid audio streams with |
||
| 899 | // valid(?) VBR headers, or VBR streams with no VBR header |
||
| 900 | if (!isset($next_frame_test_array['mpeg']['audio']['bitrate']) || !isset($info['mpeg']['audio']['bitrate']) || ($next_frame_test_array['mpeg']['audio']['bitrate'] != $info['mpeg']['audio']['bitrate'])) { |
||
| 901 | return false; |
||
| 902 | } |
||
| 903 | } |
||
| 904 | |||
| 905 | // next frame is OK, get ready to check the one after that |
||
| 906 | if (isset($next_frame_test_array['mpeg']['audio']['framelength']) && ($next_frame_test_array['mpeg']['audio']['framelength'] > 0)) { |
||
| 907 | $next_frame_test_offset += $next_frame_test_array['mpeg']['audio']['framelength']; |
||
| 908 | } else { |
||
| 909 | // non-fatal error: Frame at offset $offset has an invalid frame length. |
||
| 910 | return; |
||
| 911 | } |
||
| 912 | } else { |
||
| 913 | // non-fatal error: Next frame is not valid. |
||
| 914 | return; |
||
| 915 | } |
||
| 916 | } |
||
| 917 | return true; |
||
| 918 | } |
||
| 919 | |||
| 920 | public function FreeFormatFrameLength($fd, $offset, &$info, $deep_scan = false) |
||
| 921 | { |
||
| 922 | fseek($fd, $offset, SEEK_SET); |
||
| 923 | $mpeg_audio_data = fread($fd, 32768); |
||
| 924 | |||
| 925 | $sync_pattern1 = substr($mpeg_audio_data, 0, 4); |
||
| 926 | // may be different pattern due to padding |
||
| 927 | $sync_pattern2 = $sync_pattern1{0} . $sync_pattern1{1} . chr(ord($sync_pattern1{2}) | 0x02) . $sync_pattern1{3}; |
||
| 928 | if ($sync_pattern2 === $sync_pattern1) { |
||
| 929 | $sync_pattern2 = $sync_pattern1{0} . $sync_pattern1{1} . chr(ord($sync_pattern1{2}) & 0xFD) . $sync_pattern1{3}; |
||
| 930 | } |
||
| 931 | |||
| 932 | $frame_length = false; |
||
| 933 | $frame_length1 = strpos($mpeg_audio_data, $sync_pattern1, 4); |
||
| 934 | $frame_length2 = strpos($mpeg_audio_data, $sync_pattern2, 4); |
||
| 935 | if ($frame_length1 > 4) { |
||
| 936 | $frame_length = $frame_length1; |
||
| 937 | } |
||
| 938 | if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { |
||
| 939 | $frame_length = $frame_length2; |
||
| 940 | } |
||
| 941 | if (!$frame_length) { |
||
| 942 | // LAME 3.88 has a different value for modeextension on the first frame vs the rest |
||
| 943 | $frame_length1 = strpos($mpeg_audio_data, substr($sync_pattern1, 0, 3), 4); |
||
| 944 | $frame_length2 = strpos($mpeg_audio_data, substr($sync_pattern2, 0, 3), 4); |
||
| 945 | |||
| 946 | if ($frame_length1 > 4) { |
||
| 947 | $frame_length = $frame_length1; |
||
| 948 | } |
||
| 949 | if (($frame_length2 > 4) && ($frame_length2 < $frame_length1)) { |
||
| 950 | $frame_length = $frame_length2; |
||
| 951 | } |
||
| 952 | if (!$frame_length) { |
||
| 953 | throw new getid3_exception('Cannot find next free-format synch pattern (' . getid3_lib::PrintHexBytes($sync_pattern1) . ' or ' . getid3_lib::PrintHexBytes($sync_pattern2) . ') after offset ' . $offset); |
||
| 954 | } else { |
||
| 955 | $this->getid3->warning('ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'); |
||
| 956 | $info['audio']['codec'] = 'LAME'; |
||
| 957 | $info['audio']['encoder'] = 'LAME3.88'; |
||
| 958 | $sync_pattern1 = substr($sync_pattern1, 0, 3); |
||
| 959 | $sync_pattern2 = substr($sync_pattern2, 0, 3); |
||
| 960 | } |
||
| 961 | } |
||
| 962 | |||
| 963 | if ($deep_scan) { |
||
| 964 | $actual_frame_length_values = []; |
||
| 965 | $next_offset = $offset + $frame_length; |
||
| 966 | while ($next_offset < ($info['avdataend'] - 6)) { |
||
| 967 | fseek($fd, $next_offset - 1, SEEK_SET); |
||
| 968 | $NextSyncPattern = fread($fd, 6); |
||
| 969 | if ((substr($NextSyncPattern, 1, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 1, strlen($sync_pattern2)) == $sync_pattern2)) { |
||
| 970 | // good - found where expected |
||
| 971 | $actual_frame_length_values[] = $frame_length; |
||
| 972 | } elseif ((substr($NextSyncPattern, 0, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 0, strlen($sync_pattern2)) == $sync_pattern2)) { |
||
| 973 | // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) |
||
| 974 | $actual_frame_length_values[] = ($frame_length - 1); |
||
| 975 | $next_offset--; |
||
| 976 | } elseif ((substr($NextSyncPattern, 2, strlen($sync_pattern1)) == $sync_pattern1) || (substr($NextSyncPattern, 2, strlen($sync_pattern2)) == $sync_pattern2)) { |
||
| 977 | // ok - found one byte later than expected (last frame was padded, first frame wasn't) |
||
| 978 | $actual_frame_length_values[] = ($frame_length + 1); |
||
| 979 | $next_offset++; |
||
| 980 | } else { |
||
| 981 | throw new getid3_exception('Did not find expected free-format sync pattern at offset ' . $next_offset); |
||
| 982 | } |
||
| 983 | $next_offset += $frame_length; |
||
| 984 | } |
||
| 985 | if (count($actual_frame_length_values) > 0) { |
||
| 986 | $frame_length = intval(round(array_sum($actual_frame_length_values) / count($actual_frame_length_values))); |
||
| 987 | } |
||
| 988 | } |
||
| 989 | return $frame_length; |
||
| 990 | } |
||
| 991 | |||
| 992 | public function getOnlyMPEGaudioInfo($fd, &$info, $avdata_offset, $bit_rate_histogram = false) |
||
| 993 | { |
||
| 994 | // looks for synch, decodes MPEG audio header |
||
| 995 | |||
| 996 | fseek($fd, $avdata_offset, SEEK_SET); |
||
| 997 | |||
| 998 | $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdata_offset); |
||
| 999 | $header = fread($fd, $sync_seek_buffer_size); |
||
| 1000 | $sync_seek_buffer_size = strlen($header); |
||
| 1001 | $synch_seek_offset = 0; |
||
| 1002 | |||
| 1003 | static $mpeg_audio_version_lookup; |
||
| 1004 | static $mpeg_audio_layer_lookup; |
||
| 1005 | static $mpeg_audio_bitrate_lookup; |
||
| 1006 | if (empty($mpeg_audio_version_lookup)) { |
||
| 1007 | $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
||
| 1008 | $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
||
| 1009 | $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
||
| 1010 | } |
||
| 1011 | |||
| 1012 | while ($synch_seek_offset < $sync_seek_buffer_size) { |
||
| 1013 | if ((($avdata_offset + $synch_seek_offset) < $info['avdataend']) && !feof($fd)) { |
||
| 1014 | // if a synch's not found within the first 128k bytes, then give up |
||
| 1015 | if ($synch_seek_offset > $sync_seek_buffer_size) { |
||
| 1016 | throw new getid3_exception('Could not find valid MPEG audio synch within the first ' . round($sync_seek_buffer_size / 1024) . 'kB'); |
||
| 1017 | } |
||
| 1018 | |||
| 1019 | if (feof($fd)) { |
||
| 1020 | throw new getid3_exception('Could not find valid MPEG audio synch before end of file'); |
||
| 1021 | } |
||
| 1022 | } |
||
| 1023 | |||
| 1024 | if (($synch_seek_offset + 1) >= strlen($header)) { |
||
| 1025 | throw new getid3_exception('Could not find valid MPEG synch before end of file'); |
||
| 1026 | } |
||
| 1027 | |||
| 1028 | if (("\xFF" == $header{$synch_seek_offset}) && ($header{($synch_seek_offset + 1)} > "\xE0")) { // synch detected |
||
| 1029 | |||
| 1030 | if (!isset($first_frame_info) && !isset($info['mpeg']['audio'])) { |
||
| 1031 | $first_frame_info = $info; |
||
| 1032 | $first_frame_avdata_offset = $avdata_offset + $synch_seek_offset; |
||
| 1033 | if (!getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $first_frame_info, false)) { |
||
| 1034 | // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's |
||
| 1035 | // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below |
||
| 1036 | unset($first_frame_info); |
||
| 1037 | } |
||
| 1038 | } |
||
| 1039 | |||
| 1040 | $dummy = $info; // only overwrite real data if valid header found |
||
| 1041 | if (getid3_mp3::decodeMPEGaudioHeader($fd, $avdata_offset + $synch_seek_offset, $dummy, true)) { |
||
| 1042 | $info = $dummy; |
||
| 1043 | $info['avdataoffset'] = $avdata_offset + $synch_seek_offset; |
||
| 1044 | |||
| 1045 | switch (@$info['fileformat']) { |
||
| 1046 | case '': |
||
| 1047 | case 'mp3': |
||
| 1048 | $info['fileformat'] = 'mp3'; |
||
| 1049 | $info['audio']['dataformat'] = 'mp3'; |
||
| 1050 | break; |
||
| 1051 | } |
||
| 1052 | if (isset($first_frame_info['mpeg']['audio']['bitrate_mode']) && ('vbr' == $first_frame_info['mpeg']['audio']['bitrate_mode'])) { |
||
| 1053 | if (!(abs($info['audio']['bitrate'] - $first_frame_info['audio']['bitrate']) <= 1)) { |
||
| 1054 | // If there is garbage data between a valid VBR header frame and a sequence |
||
| 1055 | // of valid MPEG-audio frames the VBR data is no longer discarded. |
||
| 1056 | $info = $first_frame_info; |
||
| 1057 | $info['avdataoffset'] = $first_frame_avdata_offset; |
||
| 1058 | $info['fileformat'] = 'mp3'; |
||
| 1059 | $info['audio']['dataformat'] = 'mp3'; |
||
| 1060 | $dummy = $info; |
||
| 1061 | unset($dummy['mpeg']['audio']); |
||
| 1062 | $GarbageOffsetStart = $first_frame_avdata_offset + $first_frame_info['mpeg']['audio']['framelength']; |
||
| 1063 | $GarbageOffsetEnd = $avdata_offset + $synch_seek_offset; |
||
| 1064 | if (getid3_mp3::decodeMPEGaudioHeader($fd, $GarbageOffsetEnd, $dummy, true, true)) { |
||
| 1065 | $info = $dummy; |
||
| 1066 | $info['avdataoffset'] = $GarbageOffsetEnd; |
||
| 1067 | $this->getid3->warning( |
||
| 1068 | 'apparently-valid VBR header not used because could not find ' |
||
| 1069 | . getid3_mp3::VALID_CHECK_FRAMES |
||
| 1070 | . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' |
||
| 1071 | . ($GarbageOffsetEnd - $GarbageOffsetStart) |
||
| 1072 | . ' bytes between ' |
||
| 1073 | . $GarbageOffsetStart |
||
| 1074 | . ' and ' |
||
| 1075 | . $GarbageOffsetEnd |
||
| 1076 | . '), but did find valid CBR stream starting at ' |
||
| 1077 | . $GarbageOffsetEnd |
||
| 1078 | ); |
||
| 1079 | } else { |
||
| 1080 | $this->getid3->warning( |
||
| 1081 | 'using data from VBR header even though could not find ' |
||
| 1082 | . getid3_mp3::VALID_CHECK_FRAMES |
||
| 1083 | . ' consecutive MPEG-audio frames immediately after VBR header (garbage data for ' |
||
| 1084 | . ($GarbageOffsetEnd - $GarbageOffsetStart) |
||
| 1085 | . ' bytes between ' |
||
| 1086 | . $GarbageOffsetStart |
||
| 1087 | . ' and ' |
||
| 1088 | . $GarbageOffsetEnd |
||
| 1089 | . ')' |
||
| 1090 | ); |
||
| 1091 | } |
||
| 1092 | } |
||
| 1093 | } |
||
| 1094 | if (isset($info['mpeg']['audio']['bitrate_mode']) && ('vbr' == $info['mpeg']['audio']['bitrate_mode']) && !isset($info['mpeg']['audio']['VBR_method'])) { |
||
| 1095 | // VBR file with no VBR header |
||
| 1096 | $bit_rate_histogram = true; |
||
| 1097 | } |
||
| 1098 | |||
| 1099 | if ($bit_rate_histogram) { |
||
| 1100 | $info['mpeg']['audio']['stereo_distribution'] = ['stereo' => 0, 'joint stereo' => 0, 'dual channel' => 0, 'mono' => 0]; |
||
| 1101 | $info['mpeg']['audio']['version_distribution'] = ['1' => 0, '2' => 0, '2.5' => 0]; |
||
| 1102 | |||
| 1103 | if ('1' == $info['mpeg']['audio']['version']) { |
||
| 1104 | if (3 == $info['mpeg']['audio']['layer']) { |
||
| 1105 | $info['mpeg']['audio']['bitrate_distribution'] = ['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]; |
||
| 1106 | } elseif (2 == $info['mpeg']['audio']['layer']) { |
||
| 1107 | $info['mpeg']['audio']['bitrate_distribution'] = ['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]; |
||
| 1108 | } elseif (1 == $info['mpeg']['audio']['layer']) { |
||
| 1109 | $info['mpeg']['audio']['bitrate_distribution'] = ['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]; |
||
| 1110 | } |
||
| 1111 | } elseif (1 == $info['mpeg']['audio']['layer']) { |
||
| 1112 | $info['mpeg']['audio']['bitrate_distribution'] = ['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]; |
||
| 1113 | } else { |
||
| 1114 | $info['mpeg']['audio']['bitrate_distribution'] = ['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]; |
||
| 1115 | } |
||
| 1116 | |||
| 1117 | $dummy = ['avdataend' => $info['avdataend'], 'avdataoffset' => $info['avdataoffset']]; |
||
| 1118 | $synch_start_offset = $info['avdataoffset']; |
||
| 1119 | |||
| 1120 | $fast_mode = false; |
||
| 1121 | $synch_errors_found = 0; |
||
| 1122 | while ($this->decodeMPEGaudioHeader($fd, $synch_start_offset, $dummy, false, false, $fast_mode)) { |
||
| 1123 | $fast_mode = true; |
||
| 1124 | $thisframebitrate = $mpeg_audio_bitrate_lookup[$mpeg_audio_version_lookup[$dummy['mpeg']['audio']['raw']['version']]][$mpeg_audio_layer_lookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; |
||
| 1125 | |||
| 1126 | if (empty($dummy['mpeg']['audio']['framelength'])) { |
||
| 1127 | $synch_errors_found++; |
||
| 1128 | } else { |
||
| 1129 | @$info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]++; |
||
| 1130 | @$info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]++; |
||
| 1131 | @$info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]++; |
||
| 1132 | |||
| 1133 | $synch_start_offset += $dummy['mpeg']['audio']['framelength']; |
||
| 1134 | } |
||
| 1135 | } |
||
| 1136 | if ($synch_errors_found > 0) { |
||
| 1137 | $this->getid3->warning('Found ' . $synch_errors_found . ' synch errors in histogram analysis'); |
||
| 1138 | } |
||
| 1139 | |||
| 1140 | $bit_total = 0; |
||
| 1141 | $frame_counter = 0; |
||
| 1142 | foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { |
||
| 1143 | $frame_counter += $bit_rate_count; |
||
| 1144 | if ('free' != $bit_rate_value) { |
||
| 1145 | $bit_total += ($bit_rate_value * $bit_rate_count); |
||
| 1146 | } |
||
| 1147 | } |
||
| 1148 | if (0 == $frame_counter) { |
||
| 1149 | throw new getid3_exception('Corrupt MP3 file: framecounter == zero'); |
||
| 1150 | } |
||
| 1151 | $info['mpeg']['audio']['frame_count'] = $frame_counter; |
||
| 1152 | $info['mpeg']['audio']['bitrate'] = ($bit_total / $frame_counter); |
||
| 1153 | |||
| 1154 | $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; |
||
| 1155 | |||
| 1156 | // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently |
||
| 1157 | $distinct_bit_rates = 0; |
||
| 1158 | foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bit_rate_value => $bit_rate_count) { |
||
| 1159 | if ($bit_rate_count > 0) { |
||
| 1160 | $distinct_bit_rates++; |
||
| 1161 | } |
||
| 1162 | } |
||
| 1163 | if ($distinct_bit_rates > 1) { |
||
| 1164 | $info['mpeg']['audio']['bitrate_mode'] = 'vbr'; |
||
| 1165 | } else { |
||
| 1166 | $info['mpeg']['audio']['bitrate_mode'] = 'cbr'; |
||
| 1167 | } |
||
| 1168 | $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; |
||
| 1169 | } |
||
| 1170 | |||
| 1171 | break; // exit while() |
||
| 1172 | } |
||
| 1173 | } |
||
| 1174 | |||
| 1175 | $synch_seek_offset++; |
||
| 1176 | if (($avdata_offset + $synch_seek_offset) >= $info['avdataend']) { |
||
| 1177 | // end of file/data |
||
| 1178 | |||
| 1179 | if (empty($info['mpeg']['audio'])) { |
||
| 1180 | throw new getid3_exception('could not find valid MPEG synch before end of file'); |
||
| 1181 | } |
||
| 1182 | break; |
||
| 1183 | } |
||
| 1184 | } |
||
| 1185 | |||
| 1186 | $info['audio']['channels'] = $info['mpeg']['audio']['channels']; |
||
| 1187 | $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; |
||
| 1188 | $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; |
||
| 1189 | return true; |
||
| 1190 | } |
||
| 1191 | |||
| 1192 | public static function MPEGaudioVersionarray() |
||
| 1193 | { |
||
| 1194 | static $array = ['2.5', false, '2', '1']; |
||
| 1195 | return $array; |
||
| 1196 | } |
||
| 1197 | |||
| 1198 | public static function MPEGaudioLayerarray() |
||
| 1199 | { |
||
| 1200 | static $array = [false, 3, 2, 1]; |
||
| 1201 | return $array; |
||
| 1202 | } |
||
| 1203 | |||
| 1204 | public static function MPEGaudioBitratearray() |
||
| 1205 | { |
||
| 1206 | static $array; |
||
| 1207 | if (empty($array)) { |
||
| 1208 | $array = [ |
||
| 1209 | '1' => [ |
||
| 1210 | 1 => ['free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000], |
||
| 1211 | 2 => ['free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000], |
||
| 1212 | 3 => ['free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000] |
||
| 1213 | ], |
||
| 1214 | |||
| 1215 | '2' => [ |
||
| 1216 | 1 => ['free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000], |
||
| 1217 | 2 => ['free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000], |
||
| 1218 | ] |
||
| 1219 | ]; |
||
| 1220 | $array['2'][3] = $array['2'][2]; |
||
| 1221 | $array['2.5'] = $array['2']; |
||
| 1222 | } |
||
| 1223 | return $array; |
||
| 1224 | } |
||
| 1225 | |||
| 1226 | public static function MPEGaudioFrequencyarray() |
||
| 1227 | { |
||
| 1228 | static $array = [ |
||
| 1229 | '1' => [44100, 48000, 32000], |
||
| 1230 | '2' => [22050, 24000, 16000], |
||
| 1231 | '2.5' => [11025, 12000, 8000] |
||
| 1232 | ]; |
||
| 1233 | return $array; |
||
| 1234 | } |
||
| 1235 | |||
| 1236 | public static function MPEGaudioChannelModearray() |
||
| 1237 | { |
||
| 1238 | static $array = ['stereo', 'joint stereo', 'dual channel', 'mono']; |
||
| 1239 | return $array; |
||
| 1240 | } |
||
| 1241 | |||
| 1242 | public static function MPEGaudioModeExtensionarray() |
||
| 1243 | { |
||
| 1244 | static $array = [ |
||
| 1245 | 1 => ['4-31', '8-31', '12-31', '16-31'], |
||
| 1246 | 2 => ['4-31', '8-31', '12-31', '16-31'], |
||
| 1247 | 3 => ['', 'IS', 'MS', 'IS+MS'] |
||
| 1248 | ]; |
||
| 1249 | return $array; |
||
| 1250 | } |
||
| 1251 | |||
| 1252 | public static function MPEGaudioEmphasisarray() |
||
| 1253 | { |
||
| 1254 | static $array = ['none', '50/15ms', false, 'CCIT J.17']; |
||
| 1255 | return $array; |
||
| 1256 | } |
||
| 1257 | |||
| 1258 | public static function MPEGaudioHeaderBytesValid($head4, $allow_bitrate_15 = false) |
||
| 1259 | { |
||
| 1260 | return getid3_mp3::MPEGaudioHeaderValid(getid3_mp3::MPEGaudioHeaderDecode($head4), false, $allow_bitrate_15); |
||
| 1261 | } |
||
| 1262 | |||
| 1263 | public static function MPEGaudioHeaderValid($raw_array, $echo_errors = false, $allow_bitrate_15 = false) |
||
| 1264 | { |
||
| 1265 | if (0x0FFE != ($raw_array['synch'] & 0x0FFE)) { |
||
| 1266 | return false; |
||
| 1267 | } |
||
| 1268 | |||
| 1269 | static $mpeg_audio_version_lookup; |
||
| 1270 | static $mpeg_audio_layer_lookup; |
||
| 1271 | static $mpeg_audio_bitrate_lookup; |
||
| 1272 | static $mpeg_audio_frequency_lookup; |
||
| 1273 | static $mpeg_audio_channel_mode_lookup; |
||
| 1274 | static $mpeg_audio_mode_extension_lookup; |
||
| 1275 | static $mpeg_audio_emphasis_lookup; |
||
| 1276 | if (empty($mpeg_audio_version_lookup)) { |
||
| 1277 | $mpeg_audio_version_lookup = getid3_mp3::MPEGaudioVersionarray(); |
||
| 1278 | $mpeg_audio_layer_lookup = getid3_mp3::MPEGaudioLayerarray(); |
||
| 1279 | $mpeg_audio_bitrate_lookup = getid3_mp3::MPEGaudioBitratearray(); |
||
| 1280 | $mpeg_audio_frequency_lookup = getid3_mp3::MPEGaudioFrequencyarray(); |
||
| 1281 | $mpeg_audio_channel_mode_lookup = getid3_mp3::MPEGaudioChannelModearray(); |
||
| 1282 | $mpeg_audio_mode_extension_lookup = getid3_mp3::MPEGaudioModeExtensionarray(); |
||
| 1283 | $mpeg_audio_emphasis_lookup = getid3_mp3::MPEGaudioEmphasisarray(); |
||
| 1284 | } |
||
| 1285 | |||
| 1286 | if (isset($mpeg_audio_version_lookup[$raw_array['version']])) { |
||
| 1287 | $decodedVersion = $mpeg_audio_version_lookup[$raw_array['version']]; |
||
| 1288 | } else { |
||
| 1289 | echo($echo_errors ? "\n" . 'invalid Version (' . $raw_array['version'] . ')' : ''); |
||
| 1290 | return false; |
||
| 1291 | } |
||
| 1292 | if (isset($mpeg_audio_layer_lookup[$raw_array['layer']])) { |
||
| 1293 | $decodedLayer = $mpeg_audio_layer_lookup[$raw_array['layer']]; |
||
| 1294 | } else { |
||
| 1295 | echo($echo_errors ? "\n" . 'invalid Layer (' . $raw_array['layer'] . ')' : ''); |
||
| 1296 | return false; |
||
| 1297 | } |
||
| 1298 | if (!isset($mpeg_audio_bitrate_lookup[$decodedVersion][$decodedLayer][$raw_array['bitrate']])) { |
||
| 1299 | echo($echo_errors ? "\n" . 'invalid Bitrate (' . $raw_array['bitrate'] . ')' : ''); |
||
| 1300 | if (15 == $raw_array['bitrate']) { |
||
| 1301 | // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 |
||
| 1302 | // let it go through here otherwise file will not be identified |
||
| 1303 | if (!$allow_bitrate_15) { |
||
| 1304 | return false; |
||
| 1305 | } |
||
| 1306 | } else { |
||
| 1307 | return false; |
||
| 1308 | } |
||
| 1309 | } |
||
| 1310 | if (!isset($mpeg_audio_frequency_lookup[$decodedVersion][$raw_array['sample_rate']])) { |
||
| 1311 | echo($echo_errors ? "\n" . 'invalid Frequency (' . $raw_array['sample_rate'] . ')' : ''); |
||
| 1312 | return false; |
||
| 1313 | } |
||
| 1314 | if (!isset($mpeg_audio_channel_mode_lookup[$raw_array['channelmode']])) { |
||
| 1315 | echo($echo_errors ? "\n" . 'invalid ChannelMode (' . $raw_array['channelmode'] . ')' : ''); |
||
| 1316 | return false; |
||
| 1317 | } |
||
| 1318 | if (!isset($mpeg_audio_mode_extension_lookup[$decodedLayer][$raw_array['modeextension']])) { |
||
| 1319 | echo($echo_errors ? "\n" . 'invalid Mode Extension (' . $raw_array['modeextension'] . ')' : ''); |
||
| 1320 | return false; |
||
| 1321 | } |
||
| 1322 | if (!isset($mpeg_audio_emphasis_lookup[$raw_array['emphasis']])) { |
||
| 1323 | echo($echo_errors ? "\n" . 'invalid Emphasis (' . $raw_array['emphasis'] . ')' : ''); |
||
| 1324 | return false; |
||
| 1325 | } |
||
| 1326 | // These are just either set or not set, you can't mess that up :) |
||
| 1327 | // $raw_array['protection']; |
||
| 1328 | // $raw_array['padding']; |
||
| 1329 | // $raw_array['private']; |
||
| 1330 | // $raw_array['copyright']; |
||
| 1331 | // $raw_array['original']; |
||
| 1332 | |||
| 1333 | return true; |
||
| 1334 | } |
||
| 1335 | |||
| 1336 | public static function MPEGaudioHeaderDecode($header_four_bytes) |
||
| 1337 | { |
||
| 1338 | // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM |
||
| 1339 | // A - Frame sync (all bits set) |
||
| 1340 | // B - MPEG Audio version ID |
||
| 1341 | // C - Layer description |
||
| 1342 | // D - Protection bit |
||
| 1343 | // E - Bitrate index |
||
| 1344 | // F - Sampling rate frequency index |
||
| 1345 | // G - Padding bit |
||
| 1346 | // H - Private bit |
||
| 1347 | // I - Channel Mode |
||
| 1348 | // J - Mode extension (Only if Joint stereo) |
||
| 1349 | // K - Copyright |
||
| 1350 | // L - Original |
||
| 1351 | // M - Emphasis |
||
| 1352 | |||
| 1353 | if (4 != strlen($header_four_bytes)) { |
||
| 1354 | return false; |
||
| 1355 | } |
||
| 1356 | |||
| 1357 | $mpeg_raw_header['synch'] = (getid3_lib::BigEndian2Int(substr($header_four_bytes, 0, 2)) & 0xFFE0) >> 4; |
||
| 1358 | $mpeg_raw_header['version'] = (ord($header_four_bytes{1}) & 0x18) >> 3; // BB |
||
| 1359 | $mpeg_raw_header['layer'] = (ord($header_four_bytes{1}) & 0x06) >> 1; // CC |
||
| 1360 | $mpeg_raw_header['protection'] = (ord($header_four_bytes{1}) & 0x01); // D |
||
| 1361 | $mpeg_raw_header['bitrate'] = (ord($header_four_bytes{2}) & 0xF0) >> 4; // EEEE |
||
| 1362 | $mpeg_raw_header['sample_rate'] = (ord($header_four_bytes{2}) & 0x0C) >> 2; // FF |
||
| 1363 | $mpeg_raw_header['padding'] = (ord($header_four_bytes{2}) & 0x02) >> 1; // G |
||
| 1364 | $mpeg_raw_header['private'] = (ord($header_four_bytes{2}) & 0x01); // H |
||
| 1365 | $mpeg_raw_header['channelmode'] = (ord($header_four_bytes{3}) & 0xC0) >> 6; // II |
||
| 1366 | $mpeg_raw_header['modeextension'] = (ord($header_four_bytes{3}) & 0x30) >> 4; // JJ |
||
| 1367 | $mpeg_raw_header['copyright'] = (ord($header_four_bytes{3}) & 0x08) >> 3; // K |
||
| 1368 | $mpeg_raw_header['original'] = (ord($header_four_bytes{3}) & 0x04) >> 2; // L |
||
| 1369 | $mpeg_raw_header['emphasis'] = (ord($header_four_bytes{3}) & 0x03); // MM |
||
| 1370 | |||
| 1371 | return $mpeg_raw_header; |
||
| 1372 | } |
||
| 1373 | |||
| 1374 | public static function MPEGaudioFrameLength(&$bit_rate, &$version, &$layer, $padding, &$sample_rate) |
||
| 1375 | { |
||
| 1376 | if (!isset($cache[$bit_rate][$version][$layer][$padding][$sample_rate])) { |
||
| 1377 | $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = false; |
||
| 1378 | if ('free' != $bit_rate) { |
||
| 1379 | if ('1' == $version) { |
||
| 1380 | if ('1' == $layer) { |
||
| 1381 | // For Layer I slot is 32 bits long |
||
| 1382 | $frame_length_coefficient = 48; |
||
| 1383 | $slot_length = 4; |
||
| 1384 | } else { // Layer 2 / 3 |
||
| 1385 | |||
| 1386 | // for Layer 2 and Layer 3 slot is 8 bits long. |
||
| 1387 | $frame_length_coefficient = 144; |
||
| 1388 | $slot_length = 1; |
||
| 1389 | } |
||
| 1390 | } else { // MPEG-2 / MPEG-2.5 |
||
| 1391 | |||
| 1392 | if ('1' == $layer) { |
||
| 1393 | // For Layer I slot is 32 bits long |
||
| 1394 | $frame_length_coefficient = 24; |
||
| 1395 | $slot_length = 4; |
||
| 1396 | } elseif ('2' == $layer) { |
||
| 1397 | // for Layer 2 and Layer 3 slot is 8 bits long. |
||
| 1398 | $frame_length_coefficient = 144; |
||
| 1399 | $slot_length = 1; |
||
| 1400 | } else { // layer 3 |
||
| 1401 | |||
| 1402 | // for Layer 2 and Layer 3 slot is 8 bits long. |
||
| 1403 | $frame_length_coefficient = 72; |
||
| 1404 | $slot_length = 1; |
||
| 1405 | } |
||
| 1406 | } |
||
| 1407 | |||
| 1408 | // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding |
||
| 1409 | if ($sample_rate > 0) { |
||
| 1410 | $new_frame_length = ($frame_length_coefficient * $bit_rate) / $sample_rate; |
||
| 1411 | $new_frame_length = floor($new_frame_length / $slot_length) * $slot_length; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) |
||
| 1412 | if ($padding) { |
||
| 1413 | $new_frame_length += $slot_length; |
||
| 1414 | } |
||
| 1415 | $cache[$bit_rate][$version][$layer][$padding][$sample_rate] = (int)$new_frame_length; |
||
| 1416 | } |
||
| 1417 | } |
||
| 1418 | } |
||
| 1419 | return $cache[$bit_rate][$version][$layer][$padding][$sample_rate]; |
||
| 1420 | } |
||
| 1421 | |||
| 1422 | public static function ClosestStandardMP3Bitrate($bit_rate) |
||
| 1423 | { |
||
| 1424 | static $standard_bit_rates = [320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000]; |
||
| 1425 | static $bit_rate_table = [0 => '-']; |
||
| 1426 | $round_bit_rate = intval(round($bit_rate, -3)); |
||
| 1427 | if (!isset($bit_rate_table[$round_bit_rate])) { |
||
| 1428 | if ($round_bit_rate > 320000) { |
||
| 1429 | $bit_rate_table[$round_bit_rate] = round($bit_rate, -4); |
||
| 1430 | } else { |
||
| 1431 | $last_bit_rate = 320000; |
||
| 1432 | foreach ($standard_bit_rates as $standard_bit_rate) { |
||
| 1433 | $bit_rate_table[$round_bit_rate] = $standard_bit_rate; |
||
| 1434 | if ($round_bit_rate >= $standard_bit_rate - (($last_bit_rate - $standard_bit_rate) / 2)) { |
||
| 1435 | break; |
||
| 1436 | } |
||
| 1437 | $last_bit_rate = $standard_bit_rate; |
||
| 1438 | } |
||
| 1439 | } |
||
| 1440 | } |
||
| 1441 | return $bit_rate_table[$round_bit_rate]; |
||
| 1442 | } |
||
| 1443 | |||
| 1444 | public static function XingVBRidOffset($version, $channel_mode) |
||
| 1445 | { |
||
| 1446 | static $lookup = [ |
||
| 1447 | '1' => [ |
||
| 1448 | 'mono' => 0x15, // 4 + 17 = 21 |
||
| 1449 | 'stereo' => 0x24, // 4 + 32 = 36 |
||
| 1450 | 'joint stereo' => 0x24, |
||
| 1451 | 'dual channel' => 0x24 |
||
| 1452 | ], |
||
| 1453 | |||
| 1454 | '2' => [ |
||
| 1455 | 'mono' => 0x0D, // 4 + 9 = 13 |
||
| 1456 | 'stereo' => 0x15, // 4 + 17 = 21 |
||
| 1457 | 'joint stereo' => 0x15, |
||
| 1458 | 'dual channel' => 0x15 |
||
| 1459 | ], |
||
| 1460 | |||
| 1461 | '2.5' => [ |
||
| 1462 | 'mono' => 0x15, |
||
| 1463 | 'stereo' => 0x15, |
||
| 1464 | 'joint stereo' => 0x15, |
||
| 1465 | 'dual channel' => 0x15 |
||
| 1466 | ] |
||
| 1467 | ]; |
||
| 1468 | |||
| 1469 | return $lookup[$version][$channel_mode]; |
||
| 1470 | } |
||
| 1471 | |||
| 1472 | public static function LAMEvbrMethodLookup($vbr_method_id) |
||
| 1473 | { |
||
| 1474 | static $lookup = [ |
||
| 1475 | 0x00 => 'unknown', |
||
| 1476 | 0x01 => 'cbr', |
||
| 1477 | 0x02 => 'abr', |
||
| 1478 | 0x03 => 'vbr-old / vbr-rh', |
||
| 1479 | 0x04 => 'vbr-new / vbr-mtrh', |
||
| 1480 | 0x05 => 'vbr-mt', |
||
| 1481 | 0x06 => 'Full VBR Method 4', |
||
| 1482 | 0x08 => 'constant bitrate 2 pass', |
||
| 1483 | 0x09 => 'abr 2 pass', |
||
| 1484 | 0x0F => 'reserved' |
||
| 1485 | ]; |
||
| 1486 | return (isset($lookup[$vbr_method_id]) ? $lookup[$vbr_method_id] : ''); |
||
| 1487 | } |
||
| 1488 | |||
| 1489 | public static function LAMEmiscStereoModeLookup($stereo_mode_id) |
||
| 1502 | } |
||
| 1503 | |||
| 1504 | public static function LAMEmiscSourceSampleFrequencyLookup($source_sample_frequency_id) |
||
| 1505 | { |
||
| 1506 | static $lookup = [ |
||
| 1507 | 0 => '<= 32 kHz', |
||
| 1508 | 1 => '44.1 kHz', |
||
| 1509 | 2 => '48 kHz', |
||
| 1510 | 3 => '> 48kHz' |
||
| 1513 | } |
||
| 1514 | |||
| 1515 | public static function LAMEsurroundInfoLookup($surround_info_id) |
||
| 1516 | { |
||
| 1524 | } |
||
| 1525 | |||
| 1526 | public static function LAMEpresetUsedLookup($lame_tag) |
||
| 1527 | { |
||
| 1528 | if (0 == $lame_tag['preset_used_id']) { |
||
| 1577 | } |
||
| 1578 | |||
| 1579 | } |
||
| 1580 | |||
| 1581 | |||
| 1582 |
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