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Code source de LifeType 1.2.4 |
1 <?php 2 ///////////////////////////////////////////////////////////////// 3 /// getID3() by James Heinrich <info@getid3.org> // 4 // available at http://getid3.sourceforge.net // 5 // or http://www.getid3.org // 6 ///////////////////////////////////////////////////////////////// 7 // See readme.txt for more details // 8 ///////////////////////////////////////////////////////////////// 9 // // 10 // module.audio.mpc.php // 11 // module for analyzing Musepack/MPEG+ Audio files // 12 // dependencies: NONE // 13 // /// 14 ///////////////////////////////////////////////////////////////// 15 16 17 class getid3_mpc 18 { 19 20 function getid3_mpc(&$fd, &$ThisFileInfo) { 21 // http://www.uni-jena.de/~pfk/mpp/sv8/header.html 22 23 $ThisFileInfo['mpc']['header'] = array(); 24 $thisfile_mpc_header = &$ThisFileInfo['mpc']['header']; 25 26 $ThisFileInfo['fileformat'] = 'mpc'; 27 $ThisFileInfo['audio']['dataformat'] = 'mpc'; 28 $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; 29 $ThisFileInfo['audio']['channels'] = 2; // the format appears to be hardcoded for stereo only 30 $ThisFileInfo['audio']['lossless'] = false; 31 32 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); 33 34 $thisfile_mpc_header['size'] = 28; 35 $MPCheaderData = fread($fd, $thisfile_mpc_header['size']); 36 $offset = 0; 37 38 if (substr($MPCheaderData, $offset, 3) == 'MP+') { 39 40 // great, this is SV7+ 41 $thisfile_mpc_header['raw']['preamble'] = substr($MPCheaderData, $offset, 3); // should be 'MP+' 42 $offset += 3; 43 44 } elseif (preg_match('/^[\x00\x01\x10\x11\x40\x41\x50\x51\x80\x81\x90\x91\xC0\xC1\xD0\xD1][\x20-37][\x00\x20\x40\x60\x80\xA0\xC0\xE0]/s', substr($MPCheaderData, 0, 4))) { 45 46 // this is SV4 - SV6, handle seperately 47 $thisfile_mpc_header['size'] = 8; 48 49 // add size of file header to avdataoffset - calc bitrate correctly + MD5 data 50 $ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size']; 51 52 // Most of this code adapted from Jurgen Faul's MPEGplus source code - thanks Jurgen! :) 53 $HeaderDWORD[0] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 0, 4)); 54 $HeaderDWORD[1] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, 4, 4)); 55 56 57 // DDDD DDDD CCCC CCCC BBBB BBBB AAAA AAAA 58 // aaaa aaaa abcd dddd dddd deee eeff ffff 59 // 60 // a = bitrate = anything 61 // b = IS = anything 62 // c = MS = anything 63 // d = streamversion = 0000000004 or 0000000005 or 0000000006 64 // e = maxband = anything 65 // f = blocksize = 000001 for SV5+, anything(?) for SV4 66 67 $thisfile_mpc_header['target_bitrate'] = (($HeaderDWORD[0] & 0xFF800000) >> 23); 68 $thisfile_mpc_header['intensity_stereo'] = (bool) (($HeaderDWORD[0] & 0x00400000) >> 22); 69 $thisfile_mpc_header['mid-side_stereo'] = (bool) (($HeaderDWORD[0] & 0x00200000) >> 21); 70 $thisfile_mpc_header['stream_major_version'] = ($HeaderDWORD[0] & 0x001FF800) >> 11; 71 $thisfile_mpc_header['stream_minor_version'] = 0; // no sub-version numbers before SV7 72 $thisfile_mpc_header['max_band'] = ($HeaderDWORD[0] & 0x000007C0) >> 6; // related to lowpass frequency, not sure how it translates exactly 73 $thisfile_mpc_header['block_size'] = ($HeaderDWORD[0] & 0x0000003F); 74 75 switch ($thisfile_mpc_header['stream_major_version']) { 76 case 4: 77 $thisfile_mpc_header['frame_count'] = ($HeaderDWORD[1] >> 16); 78 break; 79 80 case 5: 81 case 6: 82 $thisfile_mpc_header['frame_count'] = $HeaderDWORD[1]; 83 break; 84 85 default: 86 $ThisFileInfo['error'] = 'Expecting 4, 5 or 6 in version field, found '.$thisfile_mpc_header['stream_major_version'].' instead'; 87 unset($ThisFileInfo['mpc']); 88 return false; 89 break; 90 } 91 92 if (($thisfile_mpc_header['stream_major_version'] > 4) && ($thisfile_mpc_header['block_size'] != 1)) { 93 $ThisFileInfo['warning'][] = 'Block size expected to be 1, actual value found: '.$thisfile_mpc_header['block_size']; 94 } 95 96 $thisfile_mpc_header['sample_rate'] = 44100; // AB: used by all files up to SV7 97 $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpc_header['sample_rate']; 98 $thisfile_mpc_header['samples'] = $thisfile_mpc_header['frame_count'] * 1152 * $ThisFileInfo['audio']['channels']; 99 100 if ($thisfile_mpc_header['target_bitrate'] == 0) { 101 $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; 102 } else { 103 $ThisFileInfo['audio']['bitrate_mode'] = 'cbr'; 104 } 105 106 $ThisFileInfo['mpc']['bitrate'] = ($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8 * 44100 / $thisfile_mpc_header['frame_count'] / 1152; 107 $ThisFileInfo['audio']['bitrate'] = $ThisFileInfo['mpc']['bitrate']; 108 $ThisFileInfo['audio']['encoder'] = 'SV'.$thisfile_mpc_header['stream_major_version']; 109 110 return true; 111 112 } else { 113 114 $ThisFileInfo['error'][] = 'Expecting "MP+" at offset '.$ThisFileInfo['avdataoffset'].', found "'.substr($MPCheaderData, $offset, 3).'"'; 115 unset($ThisFileInfo['fileformat']); 116 unset($ThisFileInfo['mpc']); 117 return false; 118 119 } 120 121 // Continue with SV7+ handling 122 $StreamVersionByte = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1)); 123 $offset += 1; 124 $thisfile_mpc_header['stream_major_version'] = ($StreamVersionByte & 0x0F); 125 $thisfile_mpc_header['stream_minor_version'] = ($StreamVersionByte & 0xF0) >> 4; 126 $thisfile_mpc_header['frame_count'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4)); 127 $offset += 4; 128 129 switch ($thisfile_mpc_header['stream_major_version']) { 130 case 7: 131 //$ThisFileInfo['fileformat'] = 'SV7'; 132 break; 133 134 default: 135 $ThisFileInfo['error'][] = 'Only Musepack SV7 supported'; 136 return false; 137 } 138 139 $FlagsDWORD1 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4)); 140 $offset += 4; 141 $thisfile_mpc_header['intensity_stereo'] = (bool) (($FlagsDWORD1 & 0x80000000) >> 31); 142 $thisfile_mpc_header['mid_side_stereo'] = (bool) (($FlagsDWORD1 & 0x40000000) >> 30); 143 $thisfile_mpc_header['max_subband'] = ($FlagsDWORD1 & 0x3F000000) >> 24; 144 $thisfile_mpc_header['raw']['profile'] = ($FlagsDWORD1 & 0x00F00000) >> 20; 145 $thisfile_mpc_header['begin_loud'] = (bool) (($FlagsDWORD1 & 0x00080000) >> 19); 146 $thisfile_mpc_header['end_loud'] = (bool) (($FlagsDWORD1 & 0x00040000) >> 18); 147 $thisfile_mpc_header['raw']['sample_rate'] = ($FlagsDWORD1 & 0x00030000) >> 16; 148 $thisfile_mpc_header['max_level'] = ($FlagsDWORD1 & 0x0000FFFF); 149 150 $thisfile_mpc_header['raw']['title_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2)); 151 $offset += 2; 152 $thisfile_mpc_header['raw']['title_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true); 153 $offset += 2; 154 155 $thisfile_mpc_header['raw']['album_peak'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2)); 156 $offset += 2; 157 $thisfile_mpc_header['raw']['album_gain'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 2), true); 158 $offset += 2; 159 160 $FlagsDWORD2 = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 4)); 161 $offset += 4; 162 $thisfile_mpc_header['true_gapless'] = (bool) (($FlagsDWORD2 & 0x80000000) >> 31); 163 $thisfile_mpc_header['last_frame_length'] = ($FlagsDWORD2 & 0x7FF00000) >> 20; 164 165 166 $thisfile_mpc_header['raw']['not_sure_what'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 3)); 167 $offset += 3; 168 $thisfile_mpc_header['raw']['encoder_version'] = getid3_lib::LittleEndian2Int(substr($MPCheaderData, $offset, 1)); 169 $offset += 1; 170 171 $thisfile_mpc_header['profile'] = $this->MPCprofileNameLookup($thisfile_mpc_header['raw']['profile']); 172 $thisfile_mpc_header['sample_rate'] = $this->MPCfrequencyLookup($thisfile_mpc_header['raw']['sample_rate']); 173 if ($thisfile_mpc_header['sample_rate'] == 0) { 174 $ThisFileInfo['error'][] = 'Corrupt MPC file: frequency == zero'; 175 return false; 176 } 177 $ThisFileInfo['audio']['sample_rate'] = $thisfile_mpc_header['sample_rate']; 178 $thisfile_mpc_header['samples'] = ((($thisfile_mpc_header['frame_count'] - 1) * 1152) + $thisfile_mpc_header['last_frame_length']) * $ThisFileInfo['audio']['channels']; 179 180 $ThisFileInfo['playtime_seconds'] = ($thisfile_mpc_header['samples'] / $ThisFileInfo['audio']['channels']) / $ThisFileInfo['audio']['sample_rate']; 181 if ($ThisFileInfo['playtime_seconds'] == 0) { 182 $ThisFileInfo['error'][] = 'Corrupt MPC file: playtime_seconds == zero'; 183 return false; 184 } 185 186 // add size of file header to avdataoffset - calc bitrate correctly + MD5 data 187 $ThisFileInfo['avdataoffset'] += $thisfile_mpc_header['size']; 188 189 $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; 190 191 $thisfile_mpc_header['title_peak'] = $thisfile_mpc_header['raw']['title_peak']; 192 $thisfile_mpc_header['title_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['title_peak']); 193 if ($thisfile_mpc_header['raw']['title_gain'] < 0) { 194 $thisfile_mpc_header['title_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['title_gain']) / -100; 195 } else { 196 $thisfile_mpc_header['title_gain_db'] = (float) $thisfile_mpc_header['raw']['title_gain'] / 100; 197 } 198 199 $thisfile_mpc_header['album_peak'] = $thisfile_mpc_header['raw']['album_peak']; 200 $thisfile_mpc_header['album_peak_db'] = $this->MPCpeakDBLookup($thisfile_mpc_header['album_peak']); 201 if ($thisfile_mpc_header['raw']['album_gain'] < 0) { 202 $thisfile_mpc_header['album_gain_db'] = (float) (32768 + $thisfile_mpc_header['raw']['album_gain']) / -100; 203 } else { 204 $thisfile_mpc_header['album_gain_db'] = (float) $thisfile_mpc_header['raw']['album_gain'] / 100;; 205 } 206 $thisfile_mpc_header['encoder_version'] = $this->MPCencoderVersionLookup($thisfile_mpc_header['raw']['encoder_version']); 207 208 $ThisFileInfo['replay_gain']['track']['adjustment'] = $thisfile_mpc_header['title_gain_db']; 209 $ThisFileInfo['replay_gain']['album']['adjustment'] = $thisfile_mpc_header['album_gain_db']; 210 211 if ($thisfile_mpc_header['title_peak'] > 0) { 212 $ThisFileInfo['replay_gain']['track']['peak'] = $thisfile_mpc_header['title_peak']; 213 } elseif (round($thisfile_mpc_header['max_level'] * 1.18) > 0) { 214 $ThisFileInfo['replay_gain']['track']['peak'] = getid3_lib::CastAsInt(round($thisfile_mpc_header['max_level'] * 1.18)); // why? I don't know - see mppdec.c 215 } 216 if ($thisfile_mpc_header['album_peak'] > 0) { 217 $ThisFileInfo['replay_gain']['album']['peak'] = $thisfile_mpc_header['album_peak']; 218 } 219 220 //$ThisFileInfo['audio']['encoder'] = 'SV'.$thisfile_mpc_header['stream_major_version'].'.'.$thisfile_mpc_header['stream_minor_version'].', '.$thisfile_mpc_header['encoder_version']; 221 $ThisFileInfo['audio']['encoder'] = $thisfile_mpc_header['encoder_version']; 222 $ThisFileInfo['audio']['encoder_options'] = $thisfile_mpc_header['profile']; 223 224 return true; 225 } 226 227 function MPCprofileNameLookup($profileid) { 228 static $MPCprofileNameLookup = array( 229 0 => 'no profile', 230 1 => 'Experimental', 231 2 => 'unused', 232 3 => 'unused', 233 4 => 'unused', 234 5 => 'below Telephone (q = 0.0)', 235 6 => 'below Telephone (q = 1.0)', 236 7 => 'Telephone (q = 2.0)', 237 8 => 'Thumb (q = 3.0)', 238 9 => 'Radio (q = 4.0)', 239 10 => 'Standard (q = 5.0)', 240 11 => 'Extreme (q = 6.0)', 241 12 => 'Insane (q = 7.0)', 242 13 => 'BrainDead (q = 8.0)', 243 14 => 'above BrainDead (q = 9.0)', 244 15 => 'above BrainDead (q = 10.0)' 245 ); 246 return (isset($MPCprofileNameLookup[$profileid]) ? $MPCprofileNameLookup[$profileid] : 'invalid'); 247 } 248 249 function MPCfrequencyLookup($frequencyid) { 250 static $MPCfrequencyLookup = array( 251 0 => 44100, 252 1 => 48000, 253 2 => 37800, 254 3 => 32000 255 ); 256 return (isset($MPCfrequencyLookup[$frequencyid]) ? $MPCfrequencyLookup[$frequencyid] : 'invalid'); 257 } 258 259 function MPCpeakDBLookup($intvalue) { 260 if ($intvalue > 0) { 261 return ((log10($intvalue) / log10(2)) - 15) * 6; 262 } 263 return false; 264 } 265 266 function MPCencoderVersionLookup($encoderversion) { 267 //Encoder version * 100 (106 = 1.06) 268 //EncoderVersion % 10 == 0 Release (1.0) 269 //EncoderVersion % 2 == 0 Beta (1.06) 270 //EncoderVersion % 2 == 1 Alpha (1.05a...z) 271 272 if ($encoderversion == 0) { 273 // very old version, not known exactly which 274 return 'Buschmann v1.7.0-v1.7.9 or Klemm v0.90-v1.05'; 275 } 276 277 if (($encoderversion % 10) == 0) { 278 279 // release version 280 return number_format($encoderversion / 100, 2); 281 282 } elseif (($encoderversion % 2) == 0) { 283 284 // beta version 285 return number_format($encoderversion / 100, 2).' beta'; 286 287 } 288 289 // alpha version 290 return number_format($encoderversion / 100, 2).' alpha'; 291 } 292 293 } 294 295 296 ?>
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| Généré le : Mon Nov 26 21:04:15 2007 | par Balluche grâce à PHPXref 0.7 |
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