function FLACparseMETAdata(&$fd, &$ThisFileInfo) { do { $METAdataBlockOffset = ftell($fd); $METAdataBlockHeader = fread($fd, 4); $METAdataLastBlockFlag = (bool) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80); $METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7f; $METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3)); $METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType); $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['offset'] = $METAdataBlockOffset; $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['last_meta_block'] = $METAdataLastBlockFlag; $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_type'] = $METAdataBlockType; $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_type_text'] = $METAdataBlockTypeText; $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_length'] = $METAdataBlockLength; $ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'] = fread($fd, $METAdataBlockLength); $ThisFileInfo['avdataoffset'] = ftell($fd); switch ($METAdataBlockTypeText) { case 'STREAMINFO': if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) { return false; } break; case 'PADDING': // ignore break; case 'APPLICATION': if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) { return false; } break; case 'SEEKTABLE': if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) { return false; } break; case 'VORBIS_COMMENT': $OldOffset = ftell($fd); fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR); getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo); fseek($fd, $OldOffset, SEEK_SET); break; case 'CUESHEET': if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo['flac']["{$METAdataBlockTypeText}"]['raw']['block_data'], $ThisFileInfo)) { return false; } break; default: $ThisFileInfo['warning'][] = 'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE (' . $METAdataBlockType . ') at offset ' . $METAdataBlockOffset; break; } } while ($METAdataLastBlockFlag === false); if (isset($ThisFileInfo['flac']['STREAMINFO'])) { $ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']; $ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8); if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) { $ThisFileInfo['error'][] = 'Corrupt FLAC file: uncompressed_audio_bytes == zero'; return false; } $ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes']; } // set md5_data_source - built into flac 0.5+ if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) { if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("", 16)) { $ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)'; } else { $ThisFileInfo['md5_data_source'] = ''; $md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature']; for ($i = 0; $i < strlen($md5); $i++) { $ThisFileInfo['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT); } if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data_source'])) { unset($ThisFileInfo['md5_data_source']); } } } $ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample']; if ($ThisFileInfo['audio']['bits_per_sample'] == 8) { // special case // must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value // MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed $ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file'; } if (!empty($ThisFileInfo['ogg']['vendor'])) { $ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor']; } return true; }