File indexing completed on 2024-05-12 17:25:59
0001 <?php 0002 ///////////////////////////////////////////////////////////////// 0003 /// getID3() by James Heinrich <info@getid3.org> // 0004 // available at http://getid3.sourceforge.net // 0005 // or http://www.getid3.org // 0006 // also https://github.com/JamesHeinrich/getID3 // 0007 ///////////////////////////////////////////////////////////////// 0008 // See readme.txt for more details // 0009 ///////////////////////////////////////////////////////////////// 0010 // // 0011 // module.audio.mp3.php // 0012 // module for analyzing MP3 files // 0013 // dependencies: NONE // 0014 // /// 0015 ///////////////////////////////////////////////////////////////// 0016 0017 0018 // number of frames to scan to determine if MPEG-audio sequence is valid 0019 // Lower this number to 5-20 for faster scanning 0020 // Increase this number to 50+ for most accurate detection of valid VBR/CBR 0021 // mpeg-audio streams 0022 define('GETID3_MP3_VALID_CHECK_FRAMES', 35); 0023 0024 0025 class getid3_mp3 extends getid3_handler 0026 { 0027 0028 public $allow_bruteforce = false; // forces getID3() to scan the file byte-by-byte and log all the valid audio frame headers - extremely slow, unrecommended, but may provide data from otherwise-unusuable files 0029 0030 public function Analyze() { 0031 $info = &$this->getid3->info; 0032 0033 $initialOffset = $info['avdataoffset']; 0034 0035 if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) { 0036 if ($this->allow_bruteforce) { 0037 $info['error'][] = 'Rescanning file in BruteForce mode'; 0038 $this->getOnlyMPEGaudioInfoBruteForce($this->getid3->fp, $info); 0039 } 0040 } 0041 0042 0043 if (isset($info['mpeg']['audio']['bitrate_mode'])) { 0044 $info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']); 0045 } 0046 0047 if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) { 0048 0049 $synchoffsetwarning = 'Unknown data before synch '; 0050 if (isset($info['id3v2']['headerlength'])) { 0051 $synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, '; 0052 } elseif ($initialOffset > 0) { 0053 $synchoffsetwarning .= '(should be at '.$initialOffset.', '; 0054 } else { 0055 $synchoffsetwarning .= '(should be at beginning of file, '; 0056 } 0057 $synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')'; 0058 if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) { 0059 0060 if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) { 0061 0062 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.'; 0063 $info['audio']['codec'] = 'LAME'; 0064 $CurrentDataLAMEversionString = 'LAME3.'; 0065 0066 } elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) { 0067 0068 $synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.'; 0069 $info['audio']['codec'] = 'LAME'; 0070 $CurrentDataLAMEversionString = 'LAME3.'; 0071 0072 } 0073 0074 } 0075 $info['warning'][] = $synchoffsetwarning; 0076 0077 } 0078 0079 if (isset($info['mpeg']['audio']['LAME'])) { 0080 $info['audio']['codec'] = 'LAME'; 0081 if (!empty($info['mpeg']['audio']['LAME']['long_version'])) { 0082 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00"); 0083 } elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) { 0084 $info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00"); 0085 } 0086 } 0087 0088 $CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : '')); 0089 if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) { 0090 // a version number of LAME that does not end with a number like "LAME3.92" 0091 // or with a closing parenthesis like "LAME3.88 (alpha)" 0092 // or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92) 0093 0094 // not sure what the actual last frame length will be, but will be less than or equal to 1441 0095 $PossiblyLongerLAMEversion_FrameLength = 1441; 0096 0097 // Not sure what version of LAME this is - look in padding of last frame for longer version string 0098 $PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength; 0099 $this->fseek($PossibleLAMEversionStringOffset); 0100 $PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength); 0101 switch (substr($CurrentDataLAMEversionString, -1)) { 0102 case 'a': 0103 case 'b': 0104 // "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example 0105 // need to trim off "a" to match longer string 0106 $CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1); 0107 break; 0108 } 0109 if (($PossiblyLongerLAMEversion_String = strstr($PossiblyLongerLAMEversion_Data, $CurrentDataLAMEversionString)) !== false) { 0110 if (substr($PossiblyLongerLAMEversion_String, 0, strlen($CurrentDataLAMEversionString)) == $CurrentDataLAMEversionString) { 0111 $PossiblyLongerLAMEversion_NewString = substr($PossiblyLongerLAMEversion_String, 0, strspn($PossiblyLongerLAMEversion_String, 'LAME0123456789., (abcdefghijklmnopqrstuvwxyzJFSOND)')); //"LAME3.90.3" "LAME3.87 (beta 1, Sep 27 2000)" "LAME3.88 (beta)" 0112 if (empty($info['audio']['encoder']) || (strlen($PossiblyLongerLAMEversion_NewString) > strlen($info['audio']['encoder']))) { 0113 $info['audio']['encoder'] = $PossiblyLongerLAMEversion_NewString; 0114 } 0115 } 0116 } 0117 } 0118 if (!empty($info['audio']['encoder'])) { 0119 $info['audio']['encoder'] = rtrim($info['audio']['encoder'], "\x00 "); 0120 } 0121 0122 switch (isset($info['mpeg']['audio']['layer']) ? $info['mpeg']['audio']['layer'] : '') { 0123 case 1: 0124 case 2: 0125 $info['audio']['dataformat'] = 'mp'.$info['mpeg']['audio']['layer']; 0126 break; 0127 } 0128 if (isset($info['fileformat']) && ($info['fileformat'] == 'mp3')) { 0129 switch ($info['audio']['dataformat']) { 0130 case 'mp1': 0131 case 'mp2': 0132 case 'mp3': 0133 $info['fileformat'] = $info['audio']['dataformat']; 0134 break; 0135 0136 default: 0137 $info['warning'][] = 'Expecting [audio][dataformat] to be mp1/mp2/mp3 when fileformat == mp3, [audio][dataformat] actually "'.$info['audio']['dataformat'].'"'; 0138 break; 0139 } 0140 } 0141 0142 if (empty($info['fileformat'])) { 0143 unset($info['fileformat']); 0144 unset($info['audio']['bitrate_mode']); 0145 unset($info['avdataoffset']); 0146 unset($info['avdataend']); 0147 return false; 0148 } 0149 0150 $info['mime_type'] = 'audio/mpeg'; 0151 $info['audio']['lossless'] = false; 0152 0153 // Calculate playtime 0154 if (!isset($info['playtime_seconds']) && isset($info['audio']['bitrate']) && ($info['audio']['bitrate'] > 0)) { 0155 $info['playtime_seconds'] = ($info['avdataend'] - $info['avdataoffset']) * 8 / $info['audio']['bitrate']; 0156 } 0157 0158 $info['audio']['encoder_options'] = $this->GuessEncoderOptions(); 0159 0160 return true; 0161 } 0162 0163 0164 public function GuessEncoderOptions() { 0165 // shortcuts 0166 $info = &$this->getid3->info; 0167 if (!empty($info['mpeg']['audio'])) { 0168 $thisfile_mpeg_audio = &$info['mpeg']['audio']; 0169 if (!empty($thisfile_mpeg_audio['LAME'])) { 0170 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 0171 } 0172 } 0173 0174 $encoder_options = ''; 0175 static $NamedPresetBitrates = array(16, 24, 40, 56, 112, 128, 160, 192, 256); 0176 0177 if (isset($thisfile_mpeg_audio['VBR_method']) && ($thisfile_mpeg_audio['VBR_method'] == 'Fraunhofer') && !empty($thisfile_mpeg_audio['VBR_quality'])) { 0178 0179 $encoder_options = 'VBR q'.$thisfile_mpeg_audio['VBR_quality']; 0180 0181 } elseif (!empty($thisfile_mpeg_audio_lame['preset_used']) && (!in_array($thisfile_mpeg_audio_lame['preset_used_id'], $NamedPresetBitrates))) { 0182 0183 $encoder_options = $thisfile_mpeg_audio_lame['preset_used']; 0184 0185 } elseif (!empty($thisfile_mpeg_audio_lame['vbr_quality'])) { 0186 0187 static $KnownEncoderValues = array(); 0188 if (empty($KnownEncoderValues)) { 0189 0190 //$KnownEncoderValues[abrbitrate_minbitrate][vbr_quality][raw_vbr_method][raw_noise_shaping][raw_stereo_mode][ath_type][lowpass_frequency] = 'preset name'; 0191 $KnownEncoderValues[0xFF][58][1][1][3][2][20500] = '--alt-preset insane'; // 3.90, 3.90.1, 3.92 0192 $KnownEncoderValues[0xFF][58][1][1][3][2][20600] = '--alt-preset insane'; // 3.90.2, 3.90.3, 3.91 0193 $KnownEncoderValues[0xFF][57][1][1][3][4][20500] = '--alt-preset insane'; // 3.94, 3.95 0194 $KnownEncoderValues['**'][78][3][2][3][2][19500] = '--alt-preset extreme'; // 3.90, 3.90.1, 3.92 0195 $KnownEncoderValues['**'][78][3][2][3][2][19600] = '--alt-preset extreme'; // 3.90.2, 3.91 0196 $KnownEncoderValues['**'][78][3][1][3][2][19600] = '--alt-preset extreme'; // 3.90.3 0197 $KnownEncoderValues['**'][78][4][2][3][2][19500] = '--alt-preset fast extreme'; // 3.90, 3.90.1, 3.92 0198 $KnownEncoderValues['**'][78][4][2][3][2][19600] = '--alt-preset fast extreme'; // 3.90.2, 3.90.3, 3.91 0199 $KnownEncoderValues['**'][78][3][2][3][4][19000] = '--alt-preset standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0200 $KnownEncoderValues['**'][78][3][1][3][4][19000] = '--alt-preset standard'; // 3.90.3 0201 $KnownEncoderValues['**'][78][4][2][3][4][19000] = '--alt-preset fast standard'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0202 $KnownEncoderValues['**'][78][4][1][3][4][19000] = '--alt-preset fast standard'; // 3.90.3 0203 $KnownEncoderValues['**'][88][4][1][3][3][19500] = '--r3mix'; // 3.90, 3.90.1, 3.92 0204 $KnownEncoderValues['**'][88][4][1][3][3][19600] = '--r3mix'; // 3.90.2, 3.90.3, 3.91 0205 $KnownEncoderValues['**'][67][4][1][3][4][18000] = '--r3mix'; // 3.94, 3.95 0206 $KnownEncoderValues['**'][68][3][2][3][4][18000] = '--alt-preset medium'; // 3.90.3 0207 $KnownEncoderValues['**'][68][4][2][3][4][18000] = '--alt-preset fast medium'; // 3.90.3 0208 0209 $KnownEncoderValues[0xFF][99][1][1][1][2][0] = '--preset studio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0210 $KnownEncoderValues[0xFF][58][2][1][3][2][20600] = '--preset studio'; // 3.90.3, 3.93.1 0211 $KnownEncoderValues[0xFF][58][2][1][3][2][20500] = '--preset studio'; // 3.93 0212 $KnownEncoderValues[0xFF][57][2][1][3][4][20500] = '--preset studio'; // 3.94, 3.95 0213 $KnownEncoderValues[0xC0][88][1][1][1][2][0] = '--preset cd'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0214 $KnownEncoderValues[0xC0][58][2][2][3][2][19600] = '--preset cd'; // 3.90.3, 3.93.1 0215 $KnownEncoderValues[0xC0][58][2][2][3][2][19500] = '--preset cd'; // 3.93 0216 $KnownEncoderValues[0xC0][57][2][1][3][4][19500] = '--preset cd'; // 3.94, 3.95 0217 $KnownEncoderValues[0xA0][78][1][1][3][2][18000] = '--preset hifi'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0218 $KnownEncoderValues[0xA0][58][2][2][3][2][18000] = '--preset hifi'; // 3.90.3, 3.93, 3.93.1 0219 $KnownEncoderValues[0xA0][57][2][1][3][4][18000] = '--preset hifi'; // 3.94, 3.95 0220 $KnownEncoderValues[0x80][67][1][1][3][2][18000] = '--preset tape'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0221 $KnownEncoderValues[0x80][67][1][1][3][2][15000] = '--preset radio'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0222 $KnownEncoderValues[0x70][67][1][1][3][2][15000] = '--preset fm'; // 3.90, 3.90.1, 3.90.2, 3.91, 3.92 0223 $KnownEncoderValues[0x70][58][2][2][3][2][16000] = '--preset tape/radio/fm'; // 3.90.3, 3.93, 3.93.1 0224 $KnownEncoderValues[0x70][57][2][1][3][4][16000] = '--preset tape/radio/fm'; // 3.94, 3.95 0225 $KnownEncoderValues[0x38][58][2][2][0][2][10000] = '--preset voice'; // 3.90.3, 3.93, 3.93.1 0226 $KnownEncoderValues[0x38][57][2][1][0][4][15000] = '--preset voice'; // 3.94, 3.95 0227 $KnownEncoderValues[0x38][57][2][1][0][4][16000] = '--preset voice'; // 3.94a14 0228 $KnownEncoderValues[0x28][65][1][1][0][2][7500] = '--preset mw-us'; // 3.90, 3.90.1, 3.92 0229 $KnownEncoderValues[0x28][65][1][1][0][2][7600] = '--preset mw-us'; // 3.90.2, 3.91 0230 $KnownEncoderValues[0x28][58][2][2][0][2][7000] = '--preset mw-us'; // 3.90.3, 3.93, 3.93.1 0231 $KnownEncoderValues[0x28][57][2][1][0][4][10500] = '--preset mw-us'; // 3.94, 3.95 0232 $KnownEncoderValues[0x28][57][2][1][0][4][11200] = '--preset mw-us'; // 3.94a14 0233 $KnownEncoderValues[0x28][57][2][1][0][4][8800] = '--preset mw-us'; // 3.94a15 0234 $KnownEncoderValues[0x18][58][2][2][0][2][4000] = '--preset phon+/lw/mw-eu/sw'; // 3.90.3, 3.93.1 0235 $KnownEncoderValues[0x18][58][2][2][0][2][3900] = '--preset phon+/lw/mw-eu/sw'; // 3.93 0236 $KnownEncoderValues[0x18][57][2][1][0][4][5900] = '--preset phon+/lw/mw-eu/sw'; // 3.94, 3.95 0237 $KnownEncoderValues[0x18][57][2][1][0][4][6200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a14 0238 $KnownEncoderValues[0x18][57][2][1][0][4][3200] = '--preset phon+/lw/mw-eu/sw'; // 3.94a15 0239 $KnownEncoderValues[0x10][58][2][2][0][2][3800] = '--preset phone'; // 3.90.3, 3.93.1 0240 $KnownEncoderValues[0x10][58][2][2][0][2][3700] = '--preset phone'; // 3.93 0241 $KnownEncoderValues[0x10][57][2][1][0][4][5600] = '--preset phone'; // 3.94, 3.95 0242 } 0243 0244 if (isset($KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) { 0245 0246 $encoder_options = $KnownEncoderValues[$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; 0247 0248 } elseif (isset($KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']])) { 0249 0250 $encoder_options = $KnownEncoderValues['**'][$thisfile_mpeg_audio_lame['vbr_quality']][$thisfile_mpeg_audio_lame['raw']['vbr_method']][$thisfile_mpeg_audio_lame['raw']['noise_shaping']][$thisfile_mpeg_audio_lame['raw']['stereo_mode']][$thisfile_mpeg_audio_lame['ath_type']][$thisfile_mpeg_audio_lame['lowpass_frequency']]; 0251 0252 } elseif ($info['audio']['bitrate_mode'] == 'vbr') { 0253 0254 // http://gabriel.mp3-tech.org/mp3infotag.html 0255 // int Quality = (100 - 10 * gfp->VBR_q - gfp->quality)h 0256 0257 0258 $LAME_V_value = 10 - ceil($thisfile_mpeg_audio_lame['vbr_quality'] / 10); 0259 $LAME_q_value = 100 - $thisfile_mpeg_audio_lame['vbr_quality'] - ($LAME_V_value * 10); 0260 $encoder_options = '-V'.$LAME_V_value.' -q'.$LAME_q_value; 0261 0262 } elseif ($info['audio']['bitrate_mode'] == 'cbr') { 0263 0264 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 0265 0266 } else { 0267 0268 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 0269 0270 } 0271 0272 } elseif (!empty($thisfile_mpeg_audio_lame['bitrate_abr'])) { 0273 0274 $encoder_options = 'ABR'.$thisfile_mpeg_audio_lame['bitrate_abr']; 0275 0276 } elseif (!empty($info['audio']['bitrate'])) { 0277 0278 if ($info['audio']['bitrate_mode'] == 'cbr') { 0279 $encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 0280 } else { 0281 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 0282 } 0283 0284 } 0285 if (!empty($thisfile_mpeg_audio_lame['bitrate_min'])) { 0286 $encoder_options .= ' -b'.$thisfile_mpeg_audio_lame['bitrate_min']; 0287 } 0288 0289 if (!empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']) || !empty($thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'])) { 0290 $encoder_options .= ' --nogap'; 0291 } 0292 0293 if (!empty($thisfile_mpeg_audio_lame['lowpass_frequency'])) { 0294 $ExplodedOptions = explode(' ', $encoder_options, 4); 0295 if ($ExplodedOptions[0] == '--r3mix') { 0296 $ExplodedOptions[1] = 'r3mix'; 0297 } 0298 switch ($ExplodedOptions[0]) { 0299 case '--preset': 0300 case '--alt-preset': 0301 case '--r3mix': 0302 if ($ExplodedOptions[1] == 'fast') { 0303 $ExplodedOptions[1] .= ' '.$ExplodedOptions[2]; 0304 } 0305 switch ($ExplodedOptions[1]) { 0306 case 'portable': 0307 case 'medium': 0308 case 'standard': 0309 case 'extreme': 0310 case 'insane': 0311 case 'fast portable': 0312 case 'fast medium': 0313 case 'fast standard': 0314 case 'fast extreme': 0315 case 'fast insane': 0316 case 'r3mix': 0317 static $ExpectedLowpass = array( 0318 'insane|20500' => 20500, 0319 'insane|20600' => 20600, // 3.90.2, 3.90.3, 3.91 0320 'medium|18000' => 18000, 0321 'fast medium|18000' => 18000, 0322 'extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 0323 'extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 0324 'fast extreme|19500' => 19500, // 3.90, 3.90.1, 3.92, 3.95 0325 'fast extreme|19600' => 19600, // 3.90.2, 3.90.3, 3.91, 3.93.1 0326 'standard|19000' => 19000, 0327 'fast standard|19000' => 19000, 0328 'r3mix|19500' => 19500, // 3.90, 3.90.1, 3.92 0329 'r3mix|19600' => 19600, // 3.90.2, 3.90.3, 3.91 0330 'r3mix|18000' => 18000, // 3.94, 3.95 0331 ); 0332 if (!isset($ExpectedLowpass[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio_lame['lowpass_frequency']]) && ($thisfile_mpeg_audio_lame['lowpass_frequency'] < 22050) && (round($thisfile_mpeg_audio_lame['lowpass_frequency'] / 1000) < round($thisfile_mpeg_audio['sample_rate'] / 2000))) { 0333 $encoder_options .= ' --lowpass '.$thisfile_mpeg_audio_lame['lowpass_frequency']; 0334 } 0335 break; 0336 0337 default: 0338 break; 0339 } 0340 break; 0341 } 0342 } 0343 0344 if (isset($thisfile_mpeg_audio_lame['raw']['source_sample_freq'])) { 0345 if (($thisfile_mpeg_audio['sample_rate'] == 44100) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 1)) { 0346 $encoder_options .= ' --resample 44100'; 0347 } elseif (($thisfile_mpeg_audio['sample_rate'] == 48000) && ($thisfile_mpeg_audio_lame['raw']['source_sample_freq'] != 2)) { 0348 $encoder_options .= ' --resample 48000'; 0349 } elseif ($thisfile_mpeg_audio['sample_rate'] < 44100) { 0350 switch ($thisfile_mpeg_audio_lame['raw']['source_sample_freq']) { 0351 case 0: // <= 32000 0352 // may or may not be same as source frequency - ignore 0353 break; 0354 case 1: // 44100 0355 case 2: // 48000 0356 case 3: // 48000+ 0357 $ExplodedOptions = explode(' ', $encoder_options, 4); 0358 switch ($ExplodedOptions[0]) { 0359 case '--preset': 0360 case '--alt-preset': 0361 switch ($ExplodedOptions[1]) { 0362 case 'fast': 0363 case 'portable': 0364 case 'medium': 0365 case 'standard': 0366 case 'extreme': 0367 case 'insane': 0368 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 0369 break; 0370 0371 default: 0372 static $ExpectedResampledRate = array( 0373 'phon+/lw/mw-eu/sw|16000' => 16000, 0374 'mw-us|24000' => 24000, // 3.95 0375 'mw-us|32000' => 32000, // 3.93 0376 'mw-us|16000' => 16000, // 3.92 0377 'phone|16000' => 16000, 0378 'phone|11025' => 11025, // 3.94a15 0379 'radio|32000' => 32000, // 3.94a15 0380 'fm/radio|32000' => 32000, // 3.92 0381 'fm|32000' => 32000, // 3.90 0382 'voice|32000' => 32000); 0383 if (!isset($ExpectedResampledRate[$ExplodedOptions[1].'|'.$thisfile_mpeg_audio['sample_rate']])) { 0384 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 0385 } 0386 break; 0387 } 0388 break; 0389 0390 case '--r3mix': 0391 default: 0392 $encoder_options .= ' --resample '.$thisfile_mpeg_audio['sample_rate']; 0393 break; 0394 } 0395 break; 0396 } 0397 } 0398 } 0399 if (empty($encoder_options) && !empty($info['audio']['bitrate']) && !empty($info['audio']['bitrate_mode'])) { 0400 //$encoder_options = strtoupper($info['audio']['bitrate_mode']).ceil($info['audio']['bitrate'] / 1000); 0401 $encoder_options = strtoupper($info['audio']['bitrate_mode']); 0402 } 0403 0404 return $encoder_options; 0405 } 0406 0407 0408 public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) { 0409 static $MPEGaudioVersionLookup; 0410 static $MPEGaudioLayerLookup; 0411 static $MPEGaudioBitrateLookup; 0412 static $MPEGaudioFrequencyLookup; 0413 static $MPEGaudioChannelModeLookup; 0414 static $MPEGaudioModeExtensionLookup; 0415 static $MPEGaudioEmphasisLookup; 0416 if (empty($MPEGaudioVersionLookup)) { 0417 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 0418 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 0419 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 0420 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 0421 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 0422 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 0423 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 0424 } 0425 0426 if ($this->fseek($offset) != 0) { 0427 $info['error'][] = 'decodeMPEGaudioHeader() failed to seek to next offset at '.$offset; 0428 return false; 0429 } 0430 //$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame 0431 $headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data 0432 0433 // MP3 audio frame structure: 0434 // $aa $aa $aa $aa [$bb $bb] $cc... 0435 // where $aa..$aa is the four-byte mpeg-audio header (below) 0436 // $bb $bb is the optional 2-byte CRC 0437 // and $cc... is the audio data 0438 0439 $head4 = substr($headerstring, 0, 4); 0440 0441 static $MPEGaudioHeaderDecodeCache = array(); 0442 if (isset($MPEGaudioHeaderDecodeCache[$head4])) { 0443 $MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4]; 0444 } else { 0445 $MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4); 0446 $MPEGaudioHeaderDecodeCache[$head4] = $MPEGheaderRawArray; 0447 } 0448 0449 static $MPEGaudioHeaderValidCache = array(); 0450 if (!isset($MPEGaudioHeaderValidCache[$head4])) { // Not in cache 0451 //$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true); // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1) 0452 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false); 0453 } 0454 0455 // shortcut 0456 if (!isset($info['mpeg']['audio'])) { 0457 $info['mpeg']['audio'] = array(); 0458 } 0459 $thisfile_mpeg_audio = &$info['mpeg']['audio']; 0460 0461 0462 if ($MPEGaudioHeaderValidCache[$head4]) { 0463 $thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray; 0464 } else { 0465 $info['error'][] = 'Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset; 0466 return false; 0467 } 0468 0469 if (!$FastMPEGheaderScan) { 0470 $thisfile_mpeg_audio['version'] = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']]; 0471 $thisfile_mpeg_audio['layer'] = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']]; 0472 0473 $thisfile_mpeg_audio['channelmode'] = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']]; 0474 $thisfile_mpeg_audio['channels'] = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2); 0475 $thisfile_mpeg_audio['sample_rate'] = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']]; 0476 $thisfile_mpeg_audio['protection'] = !$thisfile_mpeg_audio['raw']['protection']; 0477 $thisfile_mpeg_audio['private'] = (bool) $thisfile_mpeg_audio['raw']['private']; 0478 $thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']]; 0479 $thisfile_mpeg_audio['copyright'] = (bool) $thisfile_mpeg_audio['raw']['copyright']; 0480 $thisfile_mpeg_audio['original'] = (bool) $thisfile_mpeg_audio['raw']['original']; 0481 $thisfile_mpeg_audio['emphasis'] = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']]; 0482 0483 $info['audio']['channels'] = $thisfile_mpeg_audio['channels']; 0484 $info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate']; 0485 0486 if ($thisfile_mpeg_audio['protection']) { 0487 $thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2)); 0488 } 0489 } 0490 0491 if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) { 0492 // http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0 0493 $info['warning'][] = 'Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1'; 0494 $thisfile_mpeg_audio['raw']['bitrate'] = 0; 0495 } 0496 $thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding']; 0497 $thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']]; 0498 0499 if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) { 0500 // only skip multiple frame check if free-format bitstream found at beginning of file 0501 // otherwise is quite possibly simply corrupted data 0502 $recursivesearch = false; 0503 } 0504 0505 // For Layer 2 there are some combinations of bitrate and mode which are not allowed. 0506 if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) { 0507 0508 $info['audio']['dataformat'] = 'mp2'; 0509 switch ($thisfile_mpeg_audio['channelmode']) { 0510 0511 case 'mono': 0512 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) { 0513 // these are ok 0514 } else { 0515 $info['error'][] = $thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; 0516 return false; 0517 } 0518 break; 0519 0520 case 'stereo': 0521 case 'joint stereo': 0522 case 'dual channel': 0523 if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) { 0524 // these are ok 0525 } else { 0526 $info['error'][] = intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.'; 0527 return false; 0528 } 0529 break; 0530 0531 } 0532 0533 } 0534 0535 0536 if ($info['audio']['sample_rate'] > 0) { 0537 $thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']); 0538 } 0539 0540 $nextframetestoffset = $offset + 1; 0541 if ($thisfile_mpeg_audio['bitrate'] != 'free') { 0542 0543 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 0544 0545 if (isset($thisfile_mpeg_audio['framelength'])) { 0546 $nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength']; 0547 } else { 0548 $info['error'][] = 'Frame at offset('.$offset.') is has an invalid frame length.'; 0549 return false; 0550 } 0551 0552 } 0553 0554 $ExpectedNumberOfAudioBytes = 0; 0555 0556 //////////////////////////////////////////////////////////////////////////////////// 0557 // Variable-bitrate headers 0558 0559 if (substr($headerstring, 4 + 32, 4) == 'VBRI') { 0560 // Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36) 0561 // specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html 0562 0563 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 0564 $thisfile_mpeg_audio['VBR_method'] = 'Fraunhofer'; 0565 $info['audio']['codec'] = 'Fraunhofer'; 0566 0567 $SideInfoData = substr($headerstring, 4 + 2, 32); 0568 0569 $FraunhoferVBROffset = 36; 0570 0571 $thisfile_mpeg_audio['VBR_encoder_version'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 4, 2)); // VbriVersion 0572 $thisfile_mpeg_audio['VBR_encoder_delay'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 6, 2)); // VbriDelay 0573 $thisfile_mpeg_audio['VBR_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 8, 2)); // VbriQuality 0574 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes 0575 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames 0576 $thisfile_mpeg_audio['VBR_seek_offsets'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize 0577 $thisfile_mpeg_audio['VBR_seek_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale 0578 $thisfile_mpeg_audio['VBR_entry_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes 0579 $thisfile_mpeg_audio['VBR_entry_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames 0580 0581 $ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes']; 0582 0583 $previousbyteoffset = $offset; 0584 for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) { 0585 $Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes'])); 0586 $FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes']; 0587 $thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']); 0588 $thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset; 0589 $previousbyteoffset += $Fraunhofer_OffsetN; 0590 } 0591 0592 0593 } else { 0594 0595 // Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36) 0596 // depending on MPEG layer and number of channels 0597 0598 $VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']); 0599 $SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4); 0600 0601 if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) { 0602 // 'Xing' is traditional Xing VBR frame 0603 // 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.) 0604 // 'Info' *can* legally be used to specify a VBR file as well, however. 0605 0606 // http://www.multiweb.cz/twoinches/MP3inside.htm 0607 //00..03 = "Xing" or "Info" 0608 //04..07 = Flags: 0609 // 0x01 Frames Flag set if value for number of frames in file is stored 0610 // 0x02 Bytes Flag set if value for filesize in bytes is stored 0611 // 0x04 TOC Flag set if values for TOC are stored 0612 // 0x08 VBR Scale Flag set if values for VBR scale is stored 0613 //08..11 Frames: Number of frames in file (including the first Xing/Info one) 0614 //12..15 Bytes: File length in Bytes 0615 //16..115 TOC (Table of Contents): 0616 // Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file. 0617 // Each Byte has a value according this formula: 0618 // (TOC[i] / 256) * fileLenInBytes 0619 // So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use: 0620 // TOC[(60/240)*100] = TOC[25] 0621 // and corresponding Byte in file is then approximately at: 0622 // (TOC[25]/256) * 5000000 0623 //116..119 VBR Scale 0624 0625 0626 // should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME 0627 // if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') { 0628 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 0629 $thisfile_mpeg_audio['VBR_method'] = 'Xing'; 0630 // } else { 0631 // $ScanAsCBR = true; 0632 // $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 0633 // } 0634 0635 $thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4)); 0636 0637 $thisfile_mpeg_audio['xing_flags']['frames'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001); 0638 $thisfile_mpeg_audio['xing_flags']['bytes'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002); 0639 $thisfile_mpeg_audio['xing_flags']['toc'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004); 0640 $thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008); 0641 0642 if ($thisfile_mpeg_audio['xing_flags']['frames']) { 0643 $thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 8, 4)); 0644 //$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame 0645 } 0646 if ($thisfile_mpeg_audio['xing_flags']['bytes']) { 0647 $thisfile_mpeg_audio['VBR_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4)); 0648 } 0649 0650 //if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 0651 if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) { 0652 0653 $framelengthfloat = $thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']; 0654 0655 if ($thisfile_mpeg_audio['layer'] == '1') { 0656 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 0657 //$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 0658 $info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12; 0659 } else { 0660 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 0661 //$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 0662 $info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144; 0663 } 0664 $thisfile_mpeg_audio['framelength'] = floor($framelengthfloat); 0665 } 0666 0667 if ($thisfile_mpeg_audio['xing_flags']['toc']) { 0668 $LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100); 0669 for ($i = 0; $i < 100; $i++) { 0670 $thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData{$i}); 0671 } 0672 } 0673 if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) { 0674 $thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4)); 0675 } 0676 0677 0678 // http://gabriel.mp3-tech.org/mp3infotag.html 0679 if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') { 0680 0681 // shortcut 0682 $thisfile_mpeg_audio['LAME'] = array(); 0683 $thisfile_mpeg_audio_lame = &$thisfile_mpeg_audio['LAME']; 0684 0685 0686 $thisfile_mpeg_audio_lame['long_version'] = substr($headerstring, $VBRidOffset + 120, 20); 0687 $thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9); 0688 0689 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') { 0690 0691 // extra 11 chars are not part of version string when LAMEtag present 0692 unset($thisfile_mpeg_audio_lame['long_version']); 0693 0694 // It the LAME tag was only introduced in LAME v3.90 0695 // http://www.hydrogenaudio.org/?act=ST&f=15&t=9933 0696 0697 // Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html 0698 // are assuming a 'Xing' identifier offset of 0x24, which is the case for 0699 // MPEG-1 non-mono, but not for other combinations 0700 $LAMEtagOffsetContant = $VBRidOffset - 0x24; 0701 0702 // shortcuts 0703 $thisfile_mpeg_audio_lame['RGAD'] = array('track'=>array(), 'album'=>array()); 0704 $thisfile_mpeg_audio_lame_RGAD = &$thisfile_mpeg_audio_lame['RGAD']; 0705 $thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track']; 0706 $thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album']; 0707 $thisfile_mpeg_audio_lame['raw'] = array(); 0708 $thisfile_mpeg_audio_lame_raw = &$thisfile_mpeg_audio_lame['raw']; 0709 0710 // byte $9B VBR Quality 0711 // This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications. 0712 // Actually overwrites original Xing bytes 0713 unset($thisfile_mpeg_audio['VBR_scale']); 0714 $thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1)); 0715 0716 // bytes $9C-$A4 Encoder short VersionString 0717 $thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9); 0718 0719 // byte $A5 Info Tag revision + VBR method 0720 $LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1)); 0721 0722 $thisfile_mpeg_audio_lame['tag_revision'] = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4; 0723 $thisfile_mpeg_audio_lame_raw['vbr_method'] = $LAMEtagRevisionVBRmethod & 0x0F; 0724 $thisfile_mpeg_audio_lame['vbr_method'] = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']); 0725 $thisfile_mpeg_audio['bitrate_mode'] = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr' 0726 0727 // byte $A6 Lowpass filter value 0728 $thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100; 0729 0730 // bytes $A7-$AE Replay Gain 0731 // http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html 0732 // bytes $A7-$AA : 32 bit floating point "Peak signal amplitude" 0733 if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') { 0734 // LAME 3.94a16 and later - 9.23 fixed point 0735 // ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375 0736 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608); 0737 } else { 0738 // LAME 3.94a15 and earlier - 32-bit floating point 0739 // Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15 0740 $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4)); 0741 } 0742 if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) { 0743 unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 0744 } else { 0745 $thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']); 0746 } 0747 0748 $thisfile_mpeg_audio_lame_raw['RGAD_track'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2)); 0749 $thisfile_mpeg_audio_lame_raw['RGAD_album'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2)); 0750 0751 0752 if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) { 0753 0754 $thisfile_mpeg_audio_lame_RGAD_track['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13; 0755 $thisfile_mpeg_audio_lame_RGAD_track['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10; 0756 $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9; 0757 $thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF; 0758 $thisfile_mpeg_audio_lame_RGAD_track['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']); 0759 $thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']); 0760 $thisfile_mpeg_audio_lame_RGAD_track['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']); 0761 0762 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 0763 $info['replay_gain']['track']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 0764 } 0765 $info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator']; 0766 $info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db']; 0767 } else { 0768 unset($thisfile_mpeg_audio_lame_RGAD['track']); 0769 } 0770 if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) { 0771 0772 $thisfile_mpeg_audio_lame_RGAD_album['raw']['name'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13; 0773 $thisfile_mpeg_audio_lame_RGAD_album['raw']['originator'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10; 0774 $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit'] = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9; 0775 $thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF; 0776 $thisfile_mpeg_audio_lame_RGAD_album['name'] = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']); 0777 $thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']); 0778 $thisfile_mpeg_audio_lame_RGAD_album['gain_db'] = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']); 0779 0780 if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) { 0781 $info['replay_gain']['album']['peak'] = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude']; 0782 } 0783 $info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator']; 0784 $info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db']; 0785 } else { 0786 unset($thisfile_mpeg_audio_lame_RGAD['album']); 0787 } 0788 if (empty($thisfile_mpeg_audio_lame_RGAD)) { 0789 unset($thisfile_mpeg_audio_lame['RGAD']); 0790 } 0791 0792 0793 // byte $AF Encoding flags + ATH Type 0794 $EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1)); 0795 $thisfile_mpeg_audio_lame['encoding_flags']['nspsytune'] = (bool) ($EncodingFlagsATHtype & 0x10); 0796 $thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20); 0797 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_next'] = (bool) ($EncodingFlagsATHtype & 0x40); 0798 $thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev'] = (bool) ($EncodingFlagsATHtype & 0x80); 0799 $thisfile_mpeg_audio_lame['ath_type'] = $EncodingFlagsATHtype & 0x0F; 0800 0801 // byte $B0 if ABR {specified bitrate} else {minimal bitrate} 0802 $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1)); 0803 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR) 0804 $thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 0805 } elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR) 0806 // ignore 0807 } elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate 0808 $thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate']; 0809 } 0810 0811 // bytes $B1-$B3 Encoder delays 0812 $EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3)); 0813 $thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12; 0814 $thisfile_mpeg_audio_lame['end_padding'] = $EncoderDelays & 0x000FFF; 0815 0816 // byte $B4 Misc 0817 $MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1)); 0818 $thisfile_mpeg_audio_lame_raw['noise_shaping'] = ($MiscByte & 0x03); 0819 $thisfile_mpeg_audio_lame_raw['stereo_mode'] = ($MiscByte & 0x1C) >> 2; 0820 $thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5; 0821 $thisfile_mpeg_audio_lame_raw['source_sample_freq'] = ($MiscByte & 0xC0) >> 6; 0822 $thisfile_mpeg_audio_lame['noise_shaping'] = $thisfile_mpeg_audio_lame_raw['noise_shaping']; 0823 $thisfile_mpeg_audio_lame['stereo_mode'] = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']); 0824 $thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality']; 0825 $thisfile_mpeg_audio_lame['source_sample_freq'] = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']); 0826 0827 // byte $B5 MP3 Gain 0828 $thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true); 0829 $thisfile_mpeg_audio_lame['mp3_gain_db'] = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain']; 0830 $thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6)); 0831 0832 // bytes $B6-$B7 Preset and surround info 0833 $PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2)); 0834 // Reserved = ($PresetSurroundBytes & 0xC000); 0835 $thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800); 0836 $thisfile_mpeg_audio_lame['surround_info'] = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']); 0837 $thisfile_mpeg_audio_lame['preset_used_id'] = ($PresetSurroundBytes & 0x07FF); 0838 $thisfile_mpeg_audio_lame['preset_used'] = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame); 0839 if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) { 0840 $info['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org'; 0841 } 0842 if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) { 0843 // this may change if 3.90.4 ever comes out 0844 $thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3'; 0845 } 0846 0847 // bytes $B8-$BB MusicLength 0848 $thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4)); 0849 $ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']); 0850 0851 // bytes $BC-$BD MusicCRC 0852 $thisfile_mpeg_audio_lame['music_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2)); 0853 0854 // bytes $BE-$BF CRC-16 of Info Tag 0855 $thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2)); 0856 0857 0858 // LAME CBR 0859 if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { 0860 0861 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 0862 $thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']); 0863 $info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate']; 0864 //if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) { 0865 // $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min']; 0866 //} 0867 0868 } 0869 0870 } 0871 } 0872 0873 } else { 0874 0875 // not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header) 0876 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 0877 if ($recursivesearch) { 0878 $thisfile_mpeg_audio['bitrate_mode'] = 'vbr'; 0879 if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) { 0880 $recursivesearch = false; 0881 $thisfile_mpeg_audio['bitrate_mode'] = 'cbr'; 0882 } 0883 if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') { 0884 $info['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.'; 0885 } 0886 } 0887 0888 } 0889 0890 } 0891 0892 if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) { 0893 if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) { 0894 if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) { 0895 // ignore, audio data is broken into chunks so will always be data "missing" 0896 } 0897 elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) { 0898 $this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)'); 0899 } 0900 else { 0901 $this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)'); 0902 } 0903 } else { 0904 if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) { 0905 // $prenullbytefileoffset = $this->ftell(); 0906 // $this->fseek($info['avdataend']); 0907 // $PossibleNullByte = $this->fread(1); 0908 // $this->fseek($prenullbytefileoffset); 0909 // if ($PossibleNullByte === "\x00") { 0910 $info['avdataend']--; 0911 // $info['warning'][] = 'Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored'; 0912 // } else { 0913 // $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; 0914 // } 0915 } else { 0916 $info['warning'][] = 'Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)'; 0917 } 0918 } 0919 } 0920 0921 if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) { 0922 if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) { 0923 $framebytelength = $this->FreeFormatFrameLength($offset, true); 0924 if ($framebytelength > 0) { 0925 $thisfile_mpeg_audio['framelength'] = $framebytelength; 0926 if ($thisfile_mpeg_audio['layer'] == '1') { 0927 // BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12 0928 $info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12; 0929 } else { 0930 // Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144 0931 $info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144; 0932 } 0933 } else { 0934 $info['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header'; 0935 } 0936 } 0937 } 0938 0939 if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') { 0940 switch ($thisfile_mpeg_audio['bitrate_mode']) { 0941 case 'vbr': 0942 case 'abr': 0943 $bytes_per_frame = 1152; 0944 if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) { 0945 $bytes_per_frame = 384; 0946 } elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) { 0947 $bytes_per_frame = 576; 0948 } 0949 $thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0); 0950 if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) { 0951 $info['audio']['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; 0952 $thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion 0953 } 0954 break; 0955 } 0956 } 0957 0958 // End variable-bitrate headers 0959 //////////////////////////////////////////////////////////////////////////////////// 0960 0961 if ($recursivesearch) { 0962 0963 if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) { 0964 return false; 0965 } 0966 0967 } 0968 0969 0970 //if (false) { 0971 // // experimental side info parsing section - not returning anything useful yet 0972 // 0973 // $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData); 0974 // $SideInfoOffset = 0; 0975 // 0976 // if ($thisfile_mpeg_audio['version'] == '1') { 0977 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 0978 // // MPEG-1 (mono) 0979 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 0980 // $SideInfoOffset += 9; 0981 // $SideInfoOffset += 5; 0982 // } else { 0983 // // MPEG-1 (stereo, joint-stereo, dual-channel) 0984 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9); 0985 // $SideInfoOffset += 9; 0986 // $SideInfoOffset += 3; 0987 // } 0988 // } else { // 2 or 2.5 0989 // if ($thisfile_mpeg_audio['channelmode'] == 'mono') { 0990 // // MPEG-2, MPEG-2.5 (mono) 0991 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 0992 // $SideInfoOffset += 8; 0993 // $SideInfoOffset += 1; 0994 // } else { 0995 // // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel) 0996 // $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8); 0997 // $SideInfoOffset += 8; 0998 // $SideInfoOffset += 2; 0999 // } 1000 // } 1001 // 1002 // if ($thisfile_mpeg_audio['version'] == '1') { 1003 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { 1004 // for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) { 1005 // $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1006 // $SideInfoOffset += 2; 1007 // } 1008 // } 1009 // } 1010 // for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) { 1011 // for ($channel = 0; $channel < $info['audio']['channels']; $channel++) { 1012 // $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12); 1013 // $SideInfoOffset += 12; 1014 // $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1015 // $SideInfoOffset += 9; 1016 // $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8); 1017 // $SideInfoOffset += 8; 1018 // if ($thisfile_mpeg_audio['version'] == '1') { 1019 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1020 // $SideInfoOffset += 4; 1021 // } else { 1022 // $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9); 1023 // $SideInfoOffset += 9; 1024 // } 1025 // $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1026 // $SideInfoOffset += 1; 1027 // 1028 // if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') { 1029 // 1030 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2); 1031 // $SideInfoOffset += 2; 1032 // $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1033 // $SideInfoOffset += 1; 1034 // 1035 // for ($region = 0; $region < 2; $region++) { 1036 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1037 // $SideInfoOffset += 5; 1038 // } 1039 // $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0; 1040 // 1041 // for ($window = 0; $window < 3; $window++) { 1042 // $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1043 // $SideInfoOffset += 3; 1044 // } 1045 // 1046 // } else { 1047 // 1048 // for ($region = 0; $region < 3; $region++) { 1049 // $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5); 1050 // $SideInfoOffset += 5; 1051 // } 1052 // 1053 // $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4); 1054 // $SideInfoOffset += 4; 1055 // $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3); 1056 // $SideInfoOffset += 3; 1057 // $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0; 1058 // } 1059 // 1060 // if ($thisfile_mpeg_audio['version'] == '1') { 1061 // $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1062 // $SideInfoOffset += 1; 1063 // } 1064 // $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1065 // $SideInfoOffset += 1; 1066 // $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1); 1067 // $SideInfoOffset += 1; 1068 // } 1069 // } 1070 //} 1071 1072 return true; 1073 } 1074 1075 public function RecursiveFrameScanning(&$offset, &$nextframetestoffset, $ScanAsCBR) { 1076 $info = &$this->getid3->info; 1077 $firstframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); 1078 $this->decodeMPEGaudioHeader($offset, $firstframetestarray, false); 1079 1080 for ($i = 0; $i < GETID3_MP3_VALID_CHECK_FRAMES; $i++) { 1081 // check next GETID3_MP3_VALID_CHECK_FRAMES frames for validity, to make sure we haven't run across a false synch 1082 if (($nextframetestoffset + 4) >= $info['avdataend']) { 1083 // end of file 1084 return true; 1085 } 1086 1087 $nextframetestarray = array('error'=>'', 'warning'=>'', 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); 1088 if ($this->decodeMPEGaudioHeader($nextframetestoffset, $nextframetestarray, false)) { 1089 if ($ScanAsCBR) { 1090 // force CBR mode, used for trying to pick out invalid audio streams with valid(?) VBR headers, or VBR streams with no VBR header 1091 if (!isset($nextframetestarray['mpeg']['audio']['bitrate']) || !isset($firstframetestarray['mpeg']['audio']['bitrate']) || ($nextframetestarray['mpeg']['audio']['bitrate'] != $firstframetestarray['mpeg']['audio']['bitrate'])) { 1092 return false; 1093 } 1094 } 1095 1096 1097 // next frame is OK, get ready to check the one after that 1098 if (isset($nextframetestarray['mpeg']['audio']['framelength']) && ($nextframetestarray['mpeg']['audio']['framelength'] > 0)) { 1099 $nextframetestoffset += $nextframetestarray['mpeg']['audio']['framelength']; 1100 } else { 1101 $info['error'][] = 'Frame at offset ('.$offset.') is has an invalid frame length.'; 1102 return false; 1103 } 1104 1105 } elseif (!empty($firstframetestarray['mpeg']['audio']['framelength']) && (($nextframetestoffset + $firstframetestarray['mpeg']['audio']['framelength']) > $info['avdataend'])) { 1106 1107 // it's not the end of the file, but there's not enough data left for another frame, so assume it's garbage/padding and return OK 1108 return true; 1109 1110 } else { 1111 1112 // next frame is not valid, note the error and fail, so scanning can contiue for a valid frame sequence 1113 $info['warning'][] = 'Frame at offset ('.$offset.') is valid, but the next one at ('.$nextframetestoffset.') is not.'; 1114 1115 return false; 1116 } 1117 } 1118 return true; 1119 } 1120 1121 public function FreeFormatFrameLength($offset, $deepscan=false) { 1122 $info = &$this->getid3->info; 1123 1124 $this->fseek($offset); 1125 $MPEGaudioData = $this->fread(32768); 1126 1127 $SyncPattern1 = substr($MPEGaudioData, 0, 4); 1128 // may be different pattern due to padding 1129 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) | 0x02).$SyncPattern1{3}; 1130 if ($SyncPattern2 === $SyncPattern1) { 1131 $SyncPattern2 = $SyncPattern1{0}.$SyncPattern1{1}.chr(ord($SyncPattern1{2}) & 0xFD).$SyncPattern1{3}; 1132 } 1133 1134 $framelength = false; 1135 $framelength1 = strpos($MPEGaudioData, $SyncPattern1, 4); 1136 $framelength2 = strpos($MPEGaudioData, $SyncPattern2, 4); 1137 if ($framelength1 > 4) { 1138 $framelength = $framelength1; 1139 } 1140 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1141 $framelength = $framelength2; 1142 } 1143 if (!$framelength) { 1144 1145 // LAME 3.88 has a different value for modeextension on the first frame vs the rest 1146 $framelength1 = strpos($MPEGaudioData, substr($SyncPattern1, 0, 3), 4); 1147 $framelength2 = strpos($MPEGaudioData, substr($SyncPattern2, 0, 3), 4); 1148 1149 if ($framelength1 > 4) { 1150 $framelength = $framelength1; 1151 } 1152 if (($framelength2 > 4) && ($framelength2 < $framelength1)) { 1153 $framelength = $framelength2; 1154 } 1155 if (!$framelength) { 1156 $info['error'][] = 'Cannot find next free-format synch pattern ('.getid3_lib::PrintHexBytes($SyncPattern1).' or '.getid3_lib::PrintHexBytes($SyncPattern2).') after offset '.$offset; 1157 return false; 1158 } else { 1159 $info['warning'][] = 'ModeExtension varies between first frame and other frames (known free-format issue in LAME 3.88)'; 1160 $info['audio']['codec'] = 'LAME'; 1161 $info['audio']['encoder'] = 'LAME3.88'; 1162 $SyncPattern1 = substr($SyncPattern1, 0, 3); 1163 $SyncPattern2 = substr($SyncPattern2, 0, 3); 1164 } 1165 } 1166 1167 if ($deepscan) { 1168 1169 $ActualFrameLengthValues = array(); 1170 $nextoffset = $offset + $framelength; 1171 while ($nextoffset < ($info['avdataend'] - 6)) { 1172 $this->fseek($nextoffset - 1); 1173 $NextSyncPattern = $this->fread(6); 1174 if ((substr($NextSyncPattern, 1, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 1, strlen($SyncPattern2)) == $SyncPattern2)) { 1175 // good - found where expected 1176 $ActualFrameLengthValues[] = $framelength; 1177 } elseif ((substr($NextSyncPattern, 0, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 0, strlen($SyncPattern2)) == $SyncPattern2)) { 1178 // ok - found one byte earlier than expected (last frame wasn't padded, first frame was) 1179 $ActualFrameLengthValues[] = ($framelength - 1); 1180 $nextoffset--; 1181 } elseif ((substr($NextSyncPattern, 2, strlen($SyncPattern1)) == $SyncPattern1) || (substr($NextSyncPattern, 2, strlen($SyncPattern2)) == $SyncPattern2)) { 1182 // ok - found one byte later than expected (last frame was padded, first frame wasn't) 1183 $ActualFrameLengthValues[] = ($framelength + 1); 1184 $nextoffset++; 1185 } else { 1186 $info['error'][] = 'Did not find expected free-format sync pattern at offset '.$nextoffset; 1187 return false; 1188 } 1189 $nextoffset += $framelength; 1190 } 1191 if (count($ActualFrameLengthValues) > 0) { 1192 $framelength = intval(round(array_sum($ActualFrameLengthValues) / count($ActualFrameLengthValues))); 1193 } 1194 } 1195 return $framelength; 1196 } 1197 1198 public function getOnlyMPEGaudioInfoBruteForce() { 1199 $MPEGaudioHeaderDecodeCache = array(); 1200 $MPEGaudioHeaderValidCache = array(); 1201 $MPEGaudioHeaderLengthCache = array(); 1202 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1203 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1204 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1205 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 1206 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 1207 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 1208 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 1209 $LongMPEGversionLookup = array(); 1210 $LongMPEGlayerLookup = array(); 1211 $LongMPEGbitrateLookup = array(); 1212 $LongMPEGpaddingLookup = array(); 1213 $LongMPEGfrequencyLookup = array(); 1214 $Distribution['bitrate'] = array(); 1215 $Distribution['frequency'] = array(); 1216 $Distribution['layer'] = array(); 1217 $Distribution['version'] = array(); 1218 $Distribution['padding'] = array(); 1219 1220 $info = &$this->getid3->info; 1221 $this->fseek($info['avdataoffset']); 1222 1223 $max_frames_scan = 5000; 1224 $frames_scanned = 0; 1225 1226 $previousvalidframe = $info['avdataoffset']; 1227 while ($this->ftell() < $info['avdataend']) { 1228 set_time_limit(30); 1229 $head4 = $this->fread(4); 1230 if (strlen($head4) < 4) { 1231 break; 1232 } 1233 if ($head4{0} != "\xFF") { 1234 for ($i = 1; $i < 4; $i++) { 1235 if ($head4{$i} == "\xFF") { 1236 $this->fseek($i - 4, SEEK_CUR); 1237 continue 2; 1238 } 1239 } 1240 continue; 1241 } 1242 if (!isset($MPEGaudioHeaderDecodeCache[$head4])) { 1243 $MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4); 1244 } 1245 if (!isset($MPEGaudioHeaderValidCache[$head4])) { 1246 $MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false); 1247 } 1248 if ($MPEGaudioHeaderValidCache[$head4]) { 1249 1250 if (!isset($MPEGaudioHeaderLengthCache[$head4])) { 1251 $LongMPEGversionLookup[$head4] = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']]; 1252 $LongMPEGlayerLookup[$head4] = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']]; 1253 $LongMPEGbitrateLookup[$head4] = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']]; 1254 $LongMPEGpaddingLookup[$head4] = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding']; 1255 $LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']]; 1256 $MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength( 1257 $LongMPEGbitrateLookup[$head4], 1258 $LongMPEGversionLookup[$head4], 1259 $LongMPEGlayerLookup[$head4], 1260 $LongMPEGpaddingLookup[$head4], 1261 $LongMPEGfrequencyLookup[$head4]); 1262 } 1263 if ($MPEGaudioHeaderLengthCache[$head4] > 4) { 1264 $WhereWeWere = $this->ftell(); 1265 $this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR); 1266 $next4 = $this->fread(4); 1267 if ($next4{0} == "\xFF") { 1268 if (!isset($MPEGaudioHeaderDecodeCache[$next4])) { 1269 $MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4); 1270 } 1271 if (!isset($MPEGaudioHeaderValidCache[$next4])) { 1272 $MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false); 1273 } 1274 if ($MPEGaudioHeaderValidCache[$next4]) { 1275 $this->fseek(-4, SEEK_CUR); 1276 1277 getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]); 1278 getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]); 1279 getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]); 1280 getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]); 1281 getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]); 1282 if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) { 1283 $pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']); 1284 $info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'; 1285 foreach ($Distribution as $key1 => $value1) { 1286 foreach ($value1 as $key2 => $value2) { 1287 $Distribution[$key1][$key2] = round($value2 / $pct_data_scanned); 1288 } 1289 } 1290 break; 1291 } 1292 continue; 1293 } 1294 } 1295 unset($next4); 1296 $this->fseek($WhereWeWere - 3); 1297 } 1298 1299 } 1300 } 1301 foreach ($Distribution as $key => $value) { 1302 ksort($Distribution[$key], SORT_NUMERIC); 1303 } 1304 ksort($Distribution['version'], SORT_STRING); 1305 $info['mpeg']['audio']['bitrate_distribution'] = $Distribution['bitrate']; 1306 $info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency']; 1307 $info['mpeg']['audio']['layer_distribution'] = $Distribution['layer']; 1308 $info['mpeg']['audio']['version_distribution'] = $Distribution['version']; 1309 $info['mpeg']['audio']['padding_distribution'] = $Distribution['padding']; 1310 if (count($Distribution['version']) > 1) { 1311 $info['error'][] = 'Corrupt file - more than one MPEG version detected'; 1312 } 1313 if (count($Distribution['layer']) > 1) { 1314 $info['error'][] = 'Corrupt file - more than one MPEG layer detected'; 1315 } 1316 if (count($Distribution['frequency']) > 1) { 1317 $info['error'][] = 'Corrupt file - more than one MPEG sample rate detected'; 1318 } 1319 1320 1321 $bittotal = 0; 1322 foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) { 1323 if ($bitratevalue != 'free') { 1324 $bittotal += ($bitratevalue * $bitratecount); 1325 } 1326 } 1327 $info['mpeg']['audio']['frame_count'] = array_sum($Distribution['bitrate']); 1328 if ($info['mpeg']['audio']['frame_count'] == 0) { 1329 $info['error'][] = 'no MPEG audio frames found'; 1330 return false; 1331 } 1332 $info['mpeg']['audio']['bitrate'] = ($bittotal / $info['mpeg']['audio']['frame_count']); 1333 $info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr'); 1334 $info['mpeg']['audio']['sample_rate'] = getid3_lib::array_max($Distribution['frequency'], true); 1335 1336 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; 1337 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; 1338 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; 1339 $info['audio']['dataformat'] = 'mp'.getid3_lib::array_max($Distribution['layer'], true); 1340 $info['fileformat'] = $info['audio']['dataformat']; 1341 1342 return true; 1343 } 1344 1345 1346 public function getOnlyMPEGaudioInfo($avdataoffset, $BitrateHistogram=false) { 1347 // looks for synch, decodes MPEG audio header 1348 1349 $info = &$this->getid3->info; 1350 1351 static $MPEGaudioVersionLookup; 1352 static $MPEGaudioLayerLookup; 1353 static $MPEGaudioBitrateLookup; 1354 if (empty($MPEGaudioVersionLookup)) { 1355 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1356 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1357 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1358 1359 } 1360 1361 $this->fseek($avdataoffset); 1362 $sync_seek_buffer_size = min(128 * 1024, $info['avdataend'] - $avdataoffset); 1363 if ($sync_seek_buffer_size <= 0) { 1364 $info['error'][] = 'Invalid $sync_seek_buffer_size at offset '.$avdataoffset; 1365 return false; 1366 } 1367 $header = $this->fread($sync_seek_buffer_size); 1368 $sync_seek_buffer_size = strlen($header); 1369 $SynchSeekOffset = 0; 1370 while ($SynchSeekOffset < $sync_seek_buffer_size) { 1371 if ((($avdataoffset + $SynchSeekOffset) < $info['avdataend']) && !feof($this->getid3->fp)) { 1372 1373 if ($SynchSeekOffset > $sync_seek_buffer_size) { 1374 // if a synch's not found within the first 128k bytes, then give up 1375 $info['error'][] = 'Could not find valid MPEG audio synch within the first '.round($sync_seek_buffer_size / 1024).'kB'; 1376 if (isset($info['audio']['bitrate'])) { 1377 unset($info['audio']['bitrate']); 1378 } 1379 if (isset($info['mpeg']['audio'])) { 1380 unset($info['mpeg']['audio']); 1381 } 1382 if (empty($info['mpeg'])) { 1383 unset($info['mpeg']); 1384 } 1385 return false; 1386 1387 } elseif (feof($this->getid3->fp)) { 1388 1389 $info['error'][] = 'Could not find valid MPEG audio synch before end of file'; 1390 if (isset($info['audio']['bitrate'])) { 1391 unset($info['audio']['bitrate']); 1392 } 1393 if (isset($info['mpeg']['audio'])) { 1394 unset($info['mpeg']['audio']); 1395 } 1396 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || (count($info['mpeg']) == 0))) { 1397 unset($info['mpeg']); 1398 } 1399 return false; 1400 } 1401 } 1402 1403 if (($SynchSeekOffset + 1) >= strlen($header)) { 1404 $info['error'][] = 'Could not find valid MPEG synch before end of file'; 1405 return false; 1406 } 1407 1408 if (($header{$SynchSeekOffset} == "\xFF") && ($header{($SynchSeekOffset + 1)} > "\xE0")) { // synch detected 1409 if (!isset($FirstFrameThisfileInfo) && !isset($info['mpeg']['audio'])) { 1410 $FirstFrameThisfileInfo = $info; 1411 $FirstFrameAVDataOffset = $avdataoffset + $SynchSeekOffset; 1412 if (!$this->decodeMPEGaudioHeader($FirstFrameAVDataOffset, $FirstFrameThisfileInfo, false)) { 1413 // if this is the first valid MPEG-audio frame, save it in case it's a VBR header frame and there's 1414 // garbage between this frame and a valid sequence of MPEG-audio frames, to be restored below 1415 unset($FirstFrameThisfileInfo); 1416 } 1417 } 1418 1419 $dummy = $info; // only overwrite real data if valid header found 1420 if ($this->decodeMPEGaudioHeader($avdataoffset + $SynchSeekOffset, $dummy, true)) { 1421 $info = $dummy; 1422 $info['avdataoffset'] = $avdataoffset + $SynchSeekOffset; 1423 switch (isset($info['fileformat']) ? $info['fileformat'] : '') { 1424 case '': 1425 case 'id3': 1426 case 'ape': 1427 case 'mp3': 1428 $info['fileformat'] = 'mp3'; 1429 $info['audio']['dataformat'] = 'mp3'; 1430 break; 1431 } 1432 if (isset($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode']) && ($FirstFrameThisfileInfo['mpeg']['audio']['bitrate_mode'] == 'vbr')) { 1433 if (!(abs($info['audio']['bitrate'] - $FirstFrameThisfileInfo['audio']['bitrate']) <= 1)) { 1434 // If there is garbage data between a valid VBR header frame and a sequence 1435 // of valid MPEG-audio frames the VBR data is no longer discarded. 1436 $info = $FirstFrameThisfileInfo; 1437 $info['avdataoffset'] = $FirstFrameAVDataOffset; 1438 $info['fileformat'] = 'mp3'; 1439 $info['audio']['dataformat'] = 'mp3'; 1440 $dummy = $info; 1441 unset($dummy['mpeg']['audio']); 1442 $GarbageOffsetStart = $FirstFrameAVDataOffset + $FirstFrameThisfileInfo['mpeg']['audio']['framelength']; 1443 $GarbageOffsetEnd = $avdataoffset + $SynchSeekOffset; 1444 if ($this->decodeMPEGaudioHeader($GarbageOffsetEnd, $dummy, true, true)) { 1445 $info = $dummy; 1446 $info['avdataoffset'] = $GarbageOffsetEnd; 1447 $info['warning'][] = 'apparently-valid VBR header not used because could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.'), but did find valid CBR stream starting at '.$GarbageOffsetEnd; 1448 } else { 1449 $info['warning'][] = 'using data from VBR header even though could not find '.GETID3_MP3_VALID_CHECK_FRAMES.' consecutive MPEG-audio frames immediately after VBR header (garbage data for '.($GarbageOffsetEnd - $GarbageOffsetStart).' bytes between '.$GarbageOffsetStart.' and '.$GarbageOffsetEnd.')'; 1450 } 1451 } 1452 } 1453 if (isset($info['mpeg']['audio']['bitrate_mode']) && ($info['mpeg']['audio']['bitrate_mode'] == 'vbr') && !isset($info['mpeg']['audio']['VBR_method'])) { 1454 // VBR file with no VBR header 1455 $BitrateHistogram = true; 1456 } 1457 1458 if ($BitrateHistogram) { 1459 1460 $info['mpeg']['audio']['stereo_distribution'] = array('stereo'=>0, 'joint stereo'=>0, 'dual channel'=>0, 'mono'=>0); 1461 $info['mpeg']['audio']['version_distribution'] = array('1'=>0, '2'=>0, '2.5'=>0); 1462 1463 if ($info['mpeg']['audio']['version'] == '1') { 1464 if ($info['mpeg']['audio']['layer'] == 3) { 1465 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0); 1466 } elseif ($info['mpeg']['audio']['layer'] == 2) { 1467 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 320000=>0, 384000=>0); 1468 } elseif ($info['mpeg']['audio']['layer'] == 1) { 1469 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 64000=>0, 96000=>0, 128000=>0, 160000=>0, 192000=>0, 224000=>0, 256000=>0, 288000=>0, 320000=>0, 352000=>0, 384000=>0, 416000=>0, 448000=>0); 1470 } 1471 } elseif ($info['mpeg']['audio']['layer'] == 1) { 1472 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 32000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0, 176000=>0, 192000=>0, 224000=>0, 256000=>0); 1473 } else { 1474 $info['mpeg']['audio']['bitrate_distribution'] = array('free'=>0, 8000=>0, 16000=>0, 24000=>0, 32000=>0, 40000=>0, 48000=>0, 56000=>0, 64000=>0, 80000=>0, 96000=>0, 112000=>0, 128000=>0, 144000=>0, 160000=>0); 1475 } 1476 1477 $dummy = array('error'=>$info['error'], 'warning'=>$info['warning'], 'avdataend'=>$info['avdataend'], 'avdataoffset'=>$info['avdataoffset']); 1478 $synchstartoffset = $info['avdataoffset']; 1479 $this->fseek($info['avdataoffset']); 1480 1481 // you can play with these numbers: 1482 $max_frames_scan = 50000; 1483 $max_scan_segments = 10; 1484 1485 // don't play with these numbers: 1486 $FastMode = false; 1487 $SynchErrorsFound = 0; 1488 $frames_scanned = 0; 1489 $this_scan_segment = 0; 1490 $frames_scan_per_segment = ceil($max_frames_scan / $max_scan_segments); 1491 $pct_data_scanned = 0; 1492 for ($current_segment = 0; $current_segment < $max_scan_segments; $current_segment++) { 1493 $frames_scanned_this_segment = 0; 1494 if ($this->ftell() >= $info['avdataend']) { 1495 break; 1496 } 1497 $scan_start_offset[$current_segment] = max($this->ftell(), $info['avdataoffset'] + round($current_segment * (($info['avdataend'] - $info['avdataoffset']) / $max_scan_segments))); 1498 if ($current_segment > 0) { 1499 $this->fseek($scan_start_offset[$current_segment]); 1500 $buffer_4k = $this->fread(4096); 1501 for ($j = 0; $j < (strlen($buffer_4k) - 4); $j++) { 1502 if (($buffer_4k{$j} == "\xFF") && ($buffer_4k{($j + 1)} > "\xE0")) { // synch detected 1503 if ($this->decodeMPEGaudioHeader($scan_start_offset[$current_segment] + $j, $dummy, false, false, $FastMode)) { 1504 $calculated_next_offset = $scan_start_offset[$current_segment] + $j + $dummy['mpeg']['audio']['framelength']; 1505 if ($this->decodeMPEGaudioHeader($calculated_next_offset, $dummy, false, false, $FastMode)) { 1506 $scan_start_offset[$current_segment] += $j; 1507 break; 1508 } 1509 } 1510 } 1511 } 1512 } 1513 $synchstartoffset = $scan_start_offset[$current_segment]; 1514 while ($this->decodeMPEGaudioHeader($synchstartoffset, $dummy, false, false, $FastMode)) { 1515 $FastMode = true; 1516 $thisframebitrate = $MPEGaudioBitrateLookup[$MPEGaudioVersionLookup[$dummy['mpeg']['audio']['raw']['version']]][$MPEGaudioLayerLookup[$dummy['mpeg']['audio']['raw']['layer']]][$dummy['mpeg']['audio']['raw']['bitrate']]; 1517 1518 if (empty($dummy['mpeg']['audio']['framelength'])) { 1519 $SynchErrorsFound++; 1520 $synchstartoffset++; 1521 } else { 1522 getid3_lib::safe_inc($info['mpeg']['audio']['bitrate_distribution'][$thisframebitrate]); 1523 getid3_lib::safe_inc($info['mpeg']['audio']['stereo_distribution'][$dummy['mpeg']['audio']['channelmode']]); 1524 getid3_lib::safe_inc($info['mpeg']['audio']['version_distribution'][$dummy['mpeg']['audio']['version']]); 1525 $synchstartoffset += $dummy['mpeg']['audio']['framelength']; 1526 } 1527 $frames_scanned++; 1528 if ($frames_scan_per_segment && (++$frames_scanned_this_segment >= $frames_scan_per_segment)) { 1529 $this_pct_scanned = ($this->ftell() - $scan_start_offset[$current_segment]) / ($info['avdataend'] - $info['avdataoffset']); 1530 if (($current_segment == 0) && (($this_pct_scanned * $max_scan_segments) >= 1)) { 1531 // file likely contains < $max_frames_scan, just scan as one segment 1532 $max_scan_segments = 1; 1533 $frames_scan_per_segment = $max_frames_scan; 1534 } else { 1535 $pct_data_scanned += $this_pct_scanned; 1536 break; 1537 } 1538 } 1539 } 1540 } 1541 if ($pct_data_scanned > 0) { 1542 $info['warning'][] = 'too many MPEG audio frames to scan, only scanned '.$frames_scanned.' frames in '.$max_scan_segments.' segments ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.'; 1543 foreach ($info['mpeg']['audio'] as $key1 => $value1) { 1544 if (!preg_match('#_distribution$#i', $key1)) { 1545 continue; 1546 } 1547 foreach ($value1 as $key2 => $value2) { 1548 $info['mpeg']['audio'][$key1][$key2] = round($value2 / $pct_data_scanned); 1549 } 1550 } 1551 } 1552 1553 if ($SynchErrorsFound > 0) { 1554 $info['warning'][] = 'Found '.$SynchErrorsFound.' synch errors in histogram analysis'; 1555 //return false; 1556 } 1557 1558 $bittotal = 0; 1559 $framecounter = 0; 1560 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitratevalue => $bitratecount) { 1561 $framecounter += $bitratecount; 1562 if ($bitratevalue != 'free') { 1563 $bittotal += ($bitratevalue * $bitratecount); 1564 } 1565 } 1566 if ($framecounter == 0) { 1567 $info['error'][] = 'Corrupt MP3 file: framecounter == zero'; 1568 return false; 1569 } 1570 $info['mpeg']['audio']['frame_count'] = getid3_lib::CastAsInt($framecounter); 1571 $info['mpeg']['audio']['bitrate'] = ($bittotal / $framecounter); 1572 1573 $info['audio']['bitrate'] = $info['mpeg']['audio']['bitrate']; 1574 1575 1576 // Definitively set VBR vs CBR, even if the Xing/LAME/VBRI header says differently 1577 $distinct_bitrates = 0; 1578 foreach ($info['mpeg']['audio']['bitrate_distribution'] as $bitrate_value => $bitrate_count) { 1579 if ($bitrate_count > 0) { 1580 $distinct_bitrates++; 1581 } 1582 } 1583 if ($distinct_bitrates > 1) { 1584 $info['mpeg']['audio']['bitrate_mode'] = 'vbr'; 1585 } else { 1586 $info['mpeg']['audio']['bitrate_mode'] = 'cbr'; 1587 } 1588 $info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode']; 1589 1590 } 1591 1592 break; // exit while() 1593 } 1594 } 1595 1596 $SynchSeekOffset++; 1597 if (($avdataoffset + $SynchSeekOffset) >= $info['avdataend']) { 1598 // end of file/data 1599 1600 if (empty($info['mpeg']['audio'])) { 1601 1602 $info['error'][] = 'could not find valid MPEG synch before end of file'; 1603 if (isset($info['audio']['bitrate'])) { 1604 unset($info['audio']['bitrate']); 1605 } 1606 if (isset($info['mpeg']['audio'])) { 1607 unset($info['mpeg']['audio']); 1608 } 1609 if (isset($info['mpeg']) && (!is_array($info['mpeg']) || empty($info['mpeg']))) { 1610 unset($info['mpeg']); 1611 } 1612 return false; 1613 1614 } 1615 break; 1616 } 1617 1618 } 1619 $info['audio']['channels'] = $info['mpeg']['audio']['channels']; 1620 $info['audio']['channelmode'] = $info['mpeg']['audio']['channelmode']; 1621 $info['audio']['sample_rate'] = $info['mpeg']['audio']['sample_rate']; 1622 return true; 1623 } 1624 1625 1626 public static function MPEGaudioVersionArray() { 1627 static $MPEGaudioVersion = array('2.5', false, '2', '1'); 1628 return $MPEGaudioVersion; 1629 } 1630 1631 public static function MPEGaudioLayerArray() { 1632 static $MPEGaudioLayer = array(false, 3, 2, 1); 1633 return $MPEGaudioLayer; 1634 } 1635 1636 public static function MPEGaudioBitrateArray() { 1637 static $MPEGaudioBitrate; 1638 if (empty($MPEGaudioBitrate)) { 1639 $MPEGaudioBitrate = array ( 1640 '1' => array (1 => array('free', 32000, 64000, 96000, 128000, 160000, 192000, 224000, 256000, 288000, 320000, 352000, 384000, 416000, 448000), 1641 2 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000, 384000), 1642 3 => array('free', 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 160000, 192000, 224000, 256000, 320000) 1643 ), 1644 1645 '2' => array (1 => array('free', 32000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000, 176000, 192000, 224000, 256000), 1646 2 => array('free', 8000, 16000, 24000, 32000, 40000, 48000, 56000, 64000, 80000, 96000, 112000, 128000, 144000, 160000), 1647 ) 1648 ); 1649 $MPEGaudioBitrate['2'][3] = $MPEGaudioBitrate['2'][2]; 1650 $MPEGaudioBitrate['2.5'] = $MPEGaudioBitrate['2']; 1651 } 1652 return $MPEGaudioBitrate; 1653 } 1654 1655 public static function MPEGaudioFrequencyArray() { 1656 static $MPEGaudioFrequency; 1657 if (empty($MPEGaudioFrequency)) { 1658 $MPEGaudioFrequency = array ( 1659 '1' => array(44100, 48000, 32000), 1660 '2' => array(22050, 24000, 16000), 1661 '2.5' => array(11025, 12000, 8000) 1662 ); 1663 } 1664 return $MPEGaudioFrequency; 1665 } 1666 1667 public static function MPEGaudioChannelModeArray() { 1668 static $MPEGaudioChannelMode = array('stereo', 'joint stereo', 'dual channel', 'mono'); 1669 return $MPEGaudioChannelMode; 1670 } 1671 1672 public static function MPEGaudioModeExtensionArray() { 1673 static $MPEGaudioModeExtension; 1674 if (empty($MPEGaudioModeExtension)) { 1675 $MPEGaudioModeExtension = array ( 1676 1 => array('4-31', '8-31', '12-31', '16-31'), 1677 2 => array('4-31', '8-31', '12-31', '16-31'), 1678 3 => array('', 'IS', 'MS', 'IS+MS') 1679 ); 1680 } 1681 return $MPEGaudioModeExtension; 1682 } 1683 1684 public static function MPEGaudioEmphasisArray() { 1685 static $MPEGaudioEmphasis = array('none', '50/15ms', false, 'CCIT J.17'); 1686 return $MPEGaudioEmphasis; 1687 } 1688 1689 public static function MPEGaudioHeaderBytesValid($head4, $allowBitrate15=false) { 1690 return self::MPEGaudioHeaderValid(self::MPEGaudioHeaderDecode($head4), false, $allowBitrate15); 1691 } 1692 1693 public static function MPEGaudioHeaderValid($rawarray, $echoerrors=false, $allowBitrate15=false) { 1694 if (($rawarray['synch'] & 0x0FFE) != 0x0FFE) { 1695 return false; 1696 } 1697 1698 static $MPEGaudioVersionLookup; 1699 static $MPEGaudioLayerLookup; 1700 static $MPEGaudioBitrateLookup; 1701 static $MPEGaudioFrequencyLookup; 1702 static $MPEGaudioChannelModeLookup; 1703 static $MPEGaudioModeExtensionLookup; 1704 static $MPEGaudioEmphasisLookup; 1705 if (empty($MPEGaudioVersionLookup)) { 1706 $MPEGaudioVersionLookup = self::MPEGaudioVersionArray(); 1707 $MPEGaudioLayerLookup = self::MPEGaudioLayerArray(); 1708 $MPEGaudioBitrateLookup = self::MPEGaudioBitrateArray(); 1709 $MPEGaudioFrequencyLookup = self::MPEGaudioFrequencyArray(); 1710 $MPEGaudioChannelModeLookup = self::MPEGaudioChannelModeArray(); 1711 $MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray(); 1712 $MPEGaudioEmphasisLookup = self::MPEGaudioEmphasisArray(); 1713 } 1714 1715 if (isset($MPEGaudioVersionLookup[$rawarray['version']])) { 1716 $decodedVersion = $MPEGaudioVersionLookup[$rawarray['version']]; 1717 } else { 1718 echo ($echoerrors ? "\n".'invalid Version ('.$rawarray['version'].')' : ''); 1719 return false; 1720 } 1721 if (isset($MPEGaudioLayerLookup[$rawarray['layer']])) { 1722 $decodedLayer = $MPEGaudioLayerLookup[$rawarray['layer']]; 1723 } else { 1724 echo ($echoerrors ? "\n".'invalid Layer ('.$rawarray['layer'].')' : ''); 1725 return false; 1726 } 1727 if (!isset($MPEGaudioBitrateLookup[$decodedVersion][$decodedLayer][$rawarray['bitrate']])) { 1728 echo ($echoerrors ? "\n".'invalid Bitrate ('.$rawarray['bitrate'].')' : ''); 1729 if ($rawarray['bitrate'] == 15) { 1730 // known issue in LAME 3.90 - 3.93.1 where free-format has bitrate ID of 15 instead of 0 1731 // let it go through here otherwise file will not be identified 1732 if (!$allowBitrate15) { 1733 return false; 1734 } 1735 } else { 1736 return false; 1737 } 1738 } 1739 if (!isset($MPEGaudioFrequencyLookup[$decodedVersion][$rawarray['sample_rate']])) { 1740 echo ($echoerrors ? "\n".'invalid Frequency ('.$rawarray['sample_rate'].')' : ''); 1741 return false; 1742 } 1743 if (!isset($MPEGaudioChannelModeLookup[$rawarray['channelmode']])) { 1744 echo ($echoerrors ? "\n".'invalid ChannelMode ('.$rawarray['channelmode'].')' : ''); 1745 return false; 1746 } 1747 if (!isset($MPEGaudioModeExtensionLookup[$decodedLayer][$rawarray['modeextension']])) { 1748 echo ($echoerrors ? "\n".'invalid Mode Extension ('.$rawarray['modeextension'].')' : ''); 1749 return false; 1750 } 1751 if (!isset($MPEGaudioEmphasisLookup[$rawarray['emphasis']])) { 1752 echo ($echoerrors ? "\n".'invalid Emphasis ('.$rawarray['emphasis'].')' : ''); 1753 return false; 1754 } 1755 // These are just either set or not set, you can't mess that up :) 1756 // $rawarray['protection']; 1757 // $rawarray['padding']; 1758 // $rawarray['private']; 1759 // $rawarray['copyright']; 1760 // $rawarray['original']; 1761 1762 return true; 1763 } 1764 1765 public static function MPEGaudioHeaderDecode($Header4Bytes) { 1766 // AAAA AAAA AAAB BCCD EEEE FFGH IIJJ KLMM 1767 // A - Frame sync (all bits set) 1768 // B - MPEG Audio version ID 1769 // C - Layer description 1770 // D - Protection bit 1771 // E - Bitrate index 1772 // F - Sampling rate frequency index 1773 // G - Padding bit 1774 // H - Private bit 1775 // I - Channel Mode 1776 // J - Mode extension (Only if Joint stereo) 1777 // K - Copyright 1778 // L - Original 1779 // M - Emphasis 1780 1781 if (strlen($Header4Bytes) != 4) { 1782 return false; 1783 } 1784 1785 $MPEGrawHeader['synch'] = (getid3_lib::BigEndian2Int(substr($Header4Bytes, 0, 2)) & 0xFFE0) >> 4; 1786 $MPEGrawHeader['version'] = (ord($Header4Bytes{1}) & 0x18) >> 3; // BB 1787 $MPEGrawHeader['layer'] = (ord($Header4Bytes{1}) & 0x06) >> 1; // CC 1788 $MPEGrawHeader['protection'] = (ord($Header4Bytes{1}) & 0x01); // D 1789 $MPEGrawHeader['bitrate'] = (ord($Header4Bytes{2}) & 0xF0) >> 4; // EEEE 1790 $MPEGrawHeader['sample_rate'] = (ord($Header4Bytes{2}) & 0x0C) >> 2; // FF 1791 $MPEGrawHeader['padding'] = (ord($Header4Bytes{2}) & 0x02) >> 1; // G 1792 $MPEGrawHeader['private'] = (ord($Header4Bytes{2}) & 0x01); // H 1793 $MPEGrawHeader['channelmode'] = (ord($Header4Bytes{3}) & 0xC0) >> 6; // II 1794 $MPEGrawHeader['modeextension'] = (ord($Header4Bytes{3}) & 0x30) >> 4; // JJ 1795 $MPEGrawHeader['copyright'] = (ord($Header4Bytes{3}) & 0x08) >> 3; // K 1796 $MPEGrawHeader['original'] = (ord($Header4Bytes{3}) & 0x04) >> 2; // L 1797 $MPEGrawHeader['emphasis'] = (ord($Header4Bytes{3}) & 0x03); // MM 1798 1799 return $MPEGrawHeader; 1800 } 1801 1802 public static function MPEGaudioFrameLength(&$bitrate, &$version, &$layer, $padding, &$samplerate) { 1803 static $AudioFrameLengthCache = array(); 1804 1805 if (!isset($AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate])) { 1806 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = false; 1807 if ($bitrate != 'free') { 1808 1809 if ($version == '1') { 1810 1811 if ($layer == '1') { 1812 1813 // For Layer I slot is 32 bits long 1814 $FrameLengthCoefficient = 48; 1815 $SlotLength = 4; 1816 1817 } else { // Layer 2 / 3 1818 1819 // for Layer 2 and Layer 3 slot is 8 bits long. 1820 $FrameLengthCoefficient = 144; 1821 $SlotLength = 1; 1822 1823 } 1824 1825 } else { // MPEG-2 / MPEG-2.5 1826 1827 if ($layer == '1') { 1828 1829 // For Layer I slot is 32 bits long 1830 $FrameLengthCoefficient = 24; 1831 $SlotLength = 4; 1832 1833 } elseif ($layer == '2') { 1834 1835 // for Layer 2 and Layer 3 slot is 8 bits long. 1836 $FrameLengthCoefficient = 144; 1837 $SlotLength = 1; 1838 1839 } else { // layer 3 1840 1841 // for Layer 2 and Layer 3 slot is 8 bits long. 1842 $FrameLengthCoefficient = 72; 1843 $SlotLength = 1; 1844 1845 } 1846 1847 } 1848 1849 // FrameLengthInBytes = ((Coefficient * BitRate) / SampleRate) + Padding 1850 if ($samplerate > 0) { 1851 $NewFramelength = ($FrameLengthCoefficient * $bitrate) / $samplerate; 1852 $NewFramelength = floor($NewFramelength / $SlotLength) * $SlotLength; // round to next-lower multiple of SlotLength (1 byte for Layer 2/3, 4 bytes for Layer I) 1853 if ($padding) { 1854 $NewFramelength += $SlotLength; 1855 } 1856 $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate] = (int) $NewFramelength; 1857 } 1858 } 1859 } 1860 return $AudioFrameLengthCache[$bitrate][$version][$layer][$padding][$samplerate]; 1861 } 1862 1863 public static function ClosestStandardMP3Bitrate($bit_rate) { 1864 static $standard_bit_rates = array (320000, 256000, 224000, 192000, 160000, 128000, 112000, 96000, 80000, 64000, 56000, 48000, 40000, 32000, 24000, 16000, 8000); 1865 static $bit_rate_table = array (0=>'-'); 1866 $round_bit_rate = intval(round($bit_rate, -3)); 1867 if (!isset($bit_rate_table[$round_bit_rate])) { 1868 if ($round_bit_rate > max($standard_bit_rates)) { 1869 $bit_rate_table[$round_bit_rate] = round($bit_rate, 2 - strlen($bit_rate)); 1870 } else { 1871 $bit_rate_table[$round_bit_rate] = max($standard_bit_rates); 1872 foreach ($standard_bit_rates as $standard_bit_rate) { 1873 if ($round_bit_rate >= $standard_bit_rate + (($bit_rate_table[$round_bit_rate] - $standard_bit_rate) / 2)) { 1874 break; 1875 } 1876 $bit_rate_table[$round_bit_rate] = $standard_bit_rate; 1877 } 1878 } 1879 } 1880 return $bit_rate_table[$round_bit_rate]; 1881 } 1882 1883 public static function XingVBRidOffset($version, $channelmode) { 1884 static $XingVBRidOffsetCache = array(); 1885 if (empty($XingVBRidOffset)) { 1886 $XingVBRidOffset = array ( 1887 '1' => array ('mono' => 0x15, // 4 + 17 = 21 1888 'stereo' => 0x24, // 4 + 32 = 36 1889 'joint stereo' => 0x24, 1890 'dual channel' => 0x24 1891 ), 1892 1893 '2' => array ('mono' => 0x0D, // 4 + 9 = 13 1894 'stereo' => 0x15, // 4 + 17 = 21 1895 'joint stereo' => 0x15, 1896 'dual channel' => 0x15 1897 ), 1898 1899 '2.5' => array ('mono' => 0x15, 1900 'stereo' => 0x15, 1901 'joint stereo' => 0x15, 1902 'dual channel' => 0x15 1903 ) 1904 ); 1905 } 1906 return $XingVBRidOffset[$version][$channelmode]; 1907 } 1908 1909 public static function LAMEvbrMethodLookup($VBRmethodID) { 1910 static $LAMEvbrMethodLookup = array( 1911 0x00 => 'unknown', 1912 0x01 => 'cbr', 1913 0x02 => 'abr', 1914 0x03 => 'vbr-old / vbr-rh', 1915 0x04 => 'vbr-new / vbr-mtrh', 1916 0x05 => 'vbr-mt', 1917 0x06 => 'vbr (full vbr method 4)', 1918 0x08 => 'cbr (constant bitrate 2 pass)', 1919 0x09 => 'abr (2 pass)', 1920 0x0F => 'reserved' 1921 ); 1922 return (isset($LAMEvbrMethodLookup[$VBRmethodID]) ? $LAMEvbrMethodLookup[$VBRmethodID] : ''); 1923 } 1924 1925 public static function LAMEmiscStereoModeLookup($StereoModeID) { 1926 static $LAMEmiscStereoModeLookup = array( 1927 0 => 'mono', 1928 1 => 'stereo', 1929 2 => 'dual mono', 1930 3 => 'joint stereo', 1931 4 => 'forced stereo', 1932 5 => 'auto', 1933 6 => 'intensity stereo', 1934 7 => 'other' 1935 ); 1936 return (isset($LAMEmiscStereoModeLookup[$StereoModeID]) ? $LAMEmiscStereoModeLookup[$StereoModeID] : ''); 1937 } 1938 1939 public static function LAMEmiscSourceSampleFrequencyLookup($SourceSampleFrequencyID) { 1940 static $LAMEmiscSourceSampleFrequencyLookup = array( 1941 0 => '<= 32 kHz', 1942 1 => '44.1 kHz', 1943 2 => '48 kHz', 1944 3 => '> 48kHz' 1945 ); 1946 return (isset($LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID]) ? $LAMEmiscSourceSampleFrequencyLookup[$SourceSampleFrequencyID] : ''); 1947 } 1948 1949 public static function LAMEsurroundInfoLookup($SurroundInfoID) { 1950 static $LAMEsurroundInfoLookup = array( 1951 0 => 'no surround info', 1952 1 => 'DPL encoding', 1953 2 => 'DPL2 encoding', 1954 3 => 'Ambisonic encoding' 1955 ); 1956 return (isset($LAMEsurroundInfoLookup[$SurroundInfoID]) ? $LAMEsurroundInfoLookup[$SurroundInfoID] : 'reserved'); 1957 } 1958 1959 public static function LAMEpresetUsedLookup($LAMEtag) { 1960 1961 if ($LAMEtag['preset_used_id'] == 0) { 1962 // no preset used (LAME >=3.93) 1963 // no preset recorded (LAME <3.93) 1964 return ''; 1965 } 1966 $LAMEpresetUsedLookup = array(); 1967 1968 ///// THIS PART CANNOT BE STATIC . 1969 for ($i = 8; $i <= 320; $i++) { 1970 switch ($LAMEtag['vbr_method']) { 1971 case 'cbr': 1972 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i; 1973 break; 1974 case 'abr': 1975 default: // other VBR modes shouldn't be here(?) 1976 $LAMEpresetUsedLookup[$i] = '--alt-preset '.$i; 1977 break; 1978 } 1979 } 1980 1981 // named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions() 1982 1983 // named alt-presets 1984 $LAMEpresetUsedLookup[1000] = '--r3mix'; 1985 $LAMEpresetUsedLookup[1001] = '--alt-preset standard'; 1986 $LAMEpresetUsedLookup[1002] = '--alt-preset extreme'; 1987 $LAMEpresetUsedLookup[1003] = '--alt-preset insane'; 1988 $LAMEpresetUsedLookup[1004] = '--alt-preset fast standard'; 1989 $LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme'; 1990 $LAMEpresetUsedLookup[1006] = '--alt-preset medium'; 1991 $LAMEpresetUsedLookup[1007] = '--alt-preset fast medium'; 1992 1993 // LAME 3.94 additions/changes 1994 $LAMEpresetUsedLookup[1010] = '--preset portable'; // 3.94a15 Oct 21 2003 1995 $LAMEpresetUsedLookup[1015] = '--preset radio'; // 3.94a15 Oct 21 2003 1996 1997 $LAMEpresetUsedLookup[320] = '--preset insane'; // 3.94a15 Nov 12 2003 1998 $LAMEpresetUsedLookup[410] = '-V9'; 1999 $LAMEpresetUsedLookup[420] = '-V8'; 2000 $LAMEpresetUsedLookup[440] = '-V6'; 2001 $LAMEpresetUsedLookup[430] = '--preset radio'; // 3.94a15 Nov 12 2003 2002 $LAMEpresetUsedLookup[450] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable'; // 3.94a15 Nov 12 2003 2003 $LAMEpresetUsedLookup[460] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium'; // 3.94a15 Nov 12 2003 2004 $LAMEpresetUsedLookup[470] = '--r3mix'; // 3.94b1 Dec 18 2003 2005 $LAMEpresetUsedLookup[480] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard'; // 3.94a15 Nov 12 2003 2006 $LAMEpresetUsedLookup[490] = '-V1'; 2007 $LAMEpresetUsedLookup[500] = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme'; // 3.94a15 Nov 12 2003 2008 2009 return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to info@getid3.org'); 2010 } 2011 2012 }