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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.flac.php // 11 // module for analyzing FLAC and OggFLAC audio files // 12 // dependencies: module.audio.ogg.php // 13 // /// 14 ///////////////////////////////////////////////////////////////// 15 16 17 getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true); 18 19 class getid3_flac 20 { 21 22 function getid3_flac(&$fd, &$ThisFileInfo) { 23 // http://flac.sourceforge.net/format.html 24 25 fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); 26 $StreamMarker = fread($fd, 4); 27 if ($StreamMarker != 'fLaC') { 28 $ThisFileInfo['error'][] = 'Expecting "fLaC" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$StreamMarker.'"'; 29 return false; 30 } 31 $ThisFileInfo['fileformat'] = 'flac'; 32 $ThisFileInfo['audio']['dataformat'] = 'flac'; 33 $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; 34 $ThisFileInfo['audio']['lossless'] = true; 35 36 return getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo); 37 } 38 39 40 function FLACparseMETAdata(&$fd, &$ThisFileInfo) { 41 42 do { 43 $METAdataBlockOffset = ftell($fd); 44 $METAdataBlockHeader = fread($fd, 4); 45 $METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80); 46 $METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7F; 47 $METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3)); 48 $METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType); 49 50 if ($METAdataBlockLength < 0) { 51 $ThisFileInfo['error'][] = 'corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset; 52 break; 53 } 54 55 $ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'] = array(); 56 $ThisFileInfo_flac_METAdataBlockTypeText_raw = &$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw']; 57 58 $ThisFileInfo_flac_METAdataBlockTypeText_raw['offset'] = $METAdataBlockOffset; 59 $ThisFileInfo_flac_METAdataBlockTypeText_raw['last_meta_block'] = $METAdataLastBlockFlag; 60 $ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type'] = $METAdataBlockType; 61 $ThisFileInfo_flac_METAdataBlockTypeText_raw['block_type_text'] = $METAdataBlockTypeText; 62 $ThisFileInfo_flac_METAdataBlockTypeText_raw['block_length'] = $METAdataBlockLength; 63 $ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'] = @fread($fd, $METAdataBlockLength); 64 $ThisFileInfo['avdataoffset'] = ftell($fd); 65 66 switch ($METAdataBlockTypeText) { 67 68 case 'STREAMINFO': 69 if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) { 70 return false; 71 } 72 break; 73 74 case 'PADDING': 75 // ignore 76 break; 77 78 case 'APPLICATION': 79 if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) { 80 return false; 81 } 82 break; 83 84 case 'SEEKTABLE': 85 if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) { 86 return false; 87 } 88 break; 89 90 case 'VORBIS_COMMENT': 91 $OldOffset = ftell($fd); 92 fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR); 93 getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo); 94 fseek($fd, $OldOffset, SEEK_SET); 95 break; 96 97 case 'CUESHEET': 98 if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) { 99 return false; 100 } 101 break; 102 103 default: 104 $ThisFileInfo['warning'][] = 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset; 105 break; 106 } 107 108 } while ($METAdataLastBlockFlag === false); 109 110 111 if (isset($ThisFileInfo['flac']['STREAMINFO'])) { 112 $ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']; 113 $ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8); 114 if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) { 115 $ThisFileInfo['error'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero'; 116 return false; 117 } 118 $ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes']; 119 } 120 121 // set md5_data_source - built into flac 0.5+ 122 if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) { 123 124 if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) { 125 126 $ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)'; 127 128 } else { 129 130 $ThisFileInfo['md5_data_source'] = ''; 131 $md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature']; 132 for ($i = 0; $i < strlen($md5); $i++) { 133 $ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5{$i})), 2, '00', STR_PAD_LEFT); 134 } 135 if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) { 136 unset($ThisFileInfo['md5_data_source']); 137 } 138 139 } 140 141 } 142 143 $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample']; 144 if ($ThisFileInfo['audio']['bits_per_sample'] == 8) { 145 // special case 146 // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value 147 // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed 148 $ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file'; 149 } 150 if (!empty($ThisFileInfo['ogg']['vendor'])) { 151 $ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor']; 152 } 153 154 return true; 155 } 156 157 function FLACmetaBlockTypeLookup($blocktype) { 158 static $FLACmetaBlockTypeLookup = array(); 159 if (empty($FLACmetaBlockTypeLookup)) { 160 $FLACmetaBlockTypeLookup[0] = 'STREAMINFO'; 161 $FLACmetaBlockTypeLookup[1] = 'PADDING'; 162 $FLACmetaBlockTypeLookup[2] = 'APPLICATION'; 163 $FLACmetaBlockTypeLookup[3] = 'SEEKTABLE'; 164 $FLACmetaBlockTypeLookup[4] = 'VORBIS_COMMENT'; 165 $FLACmetaBlockTypeLookup[5] = 'CUESHEET'; 166 } 167 return (isset($FLACmetaBlockTypeLookup[$blocktype]) ? $FLACmetaBlockTypeLookup[$blocktype] : 'reserved'); 168 } 169 170 function FLACapplicationIDLookup($applicationid) { 171 static $FLACapplicationIDLookup = array(); 172 if (empty($FLACapplicationIDLookup)) { 173 // http://flac.sourceforge.net/id.html 174 $FLACapplicationIDLookup[0x46746F6C] = 'flac-tools'; // 'Ftol' 175 $FLACapplicationIDLookup[0x46746F6C] = 'Sound Font FLAC'; // 'SFFL' 176 } 177 return (isset($FLACapplicationIDLookup[$applicationid]) ? $FLACapplicationIDLookup[$applicationid] : 'reserved'); 178 } 179 180 function FLACparseSTREAMINFO($METAdataBlockData, &$ThisFileInfo) { 181 $offset = 0; 182 $ThisFileInfo['flac']['STREAMINFO']['min_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2)); 183 $offset += 2; 184 $ThisFileInfo['flac']['STREAMINFO']['max_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2)); 185 $offset += 2; 186 $ThisFileInfo['flac']['STREAMINFO']['min_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3)); 187 $offset += 3; 188 $ThisFileInfo['flac']['STREAMINFO']['max_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3)); 189 $offset += 3; 190 191 $SampleRateChannelsSampleBitsStreamSamples = getid3_lib::BigEndian2Bin(substr($METAdataBlockData, $offset, 8)); 192 $ThisFileInfo['flac']['STREAMINFO']['sample_rate'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 0, 20)); 193 $ThisFileInfo['flac']['STREAMINFO']['channels'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 20, 3)) + 1; 194 $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 23, 5)) + 1; 195 $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 28, 36)); 196 $offset += 8; 197 198 $ThisFileInfo['flac']['STREAMINFO']['audio_signature'] = substr($METAdataBlockData, $offset, 16); 199 $offset += 16; 200 201 if (!empty($ThisFileInfo['flac']['STREAMINFO']['sample_rate'])) { 202 203 $ThisFileInfo['audio']['bitrate_mode'] = 'vbr'; 204 $ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['flac']['STREAMINFO']['sample_rate']; 205 $ThisFileInfo['audio']['channels'] = $ThisFileInfo['flac']['STREAMINFO']['channels']; 206 $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample']; 207 $ThisFileInfo['playtime_seconds'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] / $ThisFileInfo['flac']['STREAMINFO']['sample_rate']; 208 $ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; 209 210 } else { 211 212 $ThisFileInfo['error'][] = 'Corrupt METAdata block: STREAMINFO'; 213 return false; 214 215 } 216 return true; 217 } 218 219 220 function FLACparseAPPLICATION($METAdataBlockData, &$ThisFileInfo) { 221 $offset = 0; 222 $ApplicationID = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 4)); 223 $offset += 4; 224 $ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['name'] = getid3_flac::FLACapplicationIDLookup($ApplicationID); 225 $ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['data'] = substr($METAdataBlockData, $offset); 226 $offset = $METAdataBlockLength; 227 228 return true; 229 } 230 231 232 function FLACparseSEEKTABLE($METAdataBlockData, &$ThisFileInfo) { 233 $offset = 0; 234 $METAdataBlockLength = strlen($METAdataBlockData); 235 $placeholderpattern = str_repeat("\xFF", 8); 236 while ($offset < $METAdataBlockLength) { 237 $SampleNumberString = substr($METAdataBlockData, $offset, 8); 238 $offset += 8; 239 if ($SampleNumberString == $placeholderpattern) { 240 241 // placeholder point 242 @$ThisFileInfo['flac']['SEEKTABLE']['placeholders']++; 243 $offset += 10; 244 245 } else { 246 247 $SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString); 248 $ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8)); 249 $offset += 8; 250 $ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2)); 251 $offset += 2; 252 253 } 254 } 255 return true; 256 } 257 258 function FLACparseCUESHEET($METAdataBlockData, &$ThisFileInfo) { 259 $offset = 0; 260 $ThisFileInfo['flac']['CUESHEET']['media_catalog_number'] = trim(substr($METAdataBlockData, $offset, 128), "\0"); 261 $offset += 128; 262 $ThisFileInfo['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8)); 263 $offset += 8; 264 $ThisFileInfo['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)) & 0x80); 265 $offset += 1; 266 267 $offset += 258; // reserved 268 269 $ThisFileInfo['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)); 270 $offset += 1; 271 272 for ($track = 0; $track < $ThisFileInfo['flac']['CUESHEET']['number_tracks']; $track++) { 273 $TrackSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8)); 274 $offset += 8; 275 $TrackNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)); 276 $offset += 1; 277 278 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset; 279 280 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($METAdataBlockData, $offset, 12); 281 $offset += 12; 282 283 $TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)); 284 $offset += 1; 285 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80); 286 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40); 287 288 $offset += 13; // reserved 289 290 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)); 291 $offset += 1; 292 293 for ($index = 0; $index < $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) { 294 $IndexSampleOffset = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8)); 295 $offset += 8; 296 $IndexNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1)); 297 $offset += 1; 298 299 $offset += 3; // reserved 300 301 $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset; 302 } 303 } 304 return true; 305 } 306 307 } 308 309 ?>
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| Généré le : Mon Nov 26 21:04:15 2007 | par Balluche grâce à PHPXref 0.7 |
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