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tomas
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285
livesupport/modules/getid3/var/getid3.flac.php
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285
livesupport/modules/getid3/var/getid3.flac.php
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<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <getid3@users.sourceforge.net> //
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// available at http://getid3.sourceforge.net ///
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/////////////////////////////////////////////////////////////////
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// //
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// getid3.flac.php - part of getID3() //
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// See getid3.readme.txt for more details //
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// //
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/////////////////////////////////////////////////////////////////
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function getFLACHeaderFilepointer(&$fd, &$ThisFileInfo) {
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// http://flac.sourceforge.net/format.html
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fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET);
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$StreamMarker = fread($fd, 4);
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if ($StreamMarker != 'fLaC') {
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$ThisFileInfo['error'] .= "\n".'Invalid stream_marker - expected "fLaC", found "'.$StreamMarker.'"';;
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return false;
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}
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$ThisFileInfo['fileformat'] = 'flac';
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$ThisFileInfo['audio']['dataformat'] = 'flac';
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
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return FLACparseMETAdata($fd, $ThisFileInfo);
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}
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function FLACparseMETAdata(&$fd, &$ThisFileInfo) {
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do {
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$METAdataBlockOffset = ftell($fd);
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$METAdataBlockHeader = fread($fd, 4);
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$METAdataLastBlockFlag = (bool) (BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
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$METAdataBlockType = BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7F;
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$METAdataBlockLength = BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
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$METAdataBlockTypeText = FLACmetaBlockTypeLookup($METAdataBlockType);
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['offset'] = $METAdataBlockOffset;
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['last_meta_block'] = $METAdataLastBlockFlag;
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_type'] = $METAdataBlockType;
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_type_text'] = $METAdataBlockTypeText;
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_length'] = $METAdataBlockLength;
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$ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'] = fread($fd, $METAdataBlockLength);
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$ThisFileInfo['avdataoffset'] = ftell($fd);
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switch ($METAdataBlockTypeText) {
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case 'STREAMINFO':
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if (!FLACparseSTREAMINFO($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'PADDING':
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// ignore
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break;
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case 'APPLICATION':
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if (!FLACparseAPPLICATION($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'SEEKTABLE':
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if (!FLACparseSEEKTABLE($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'VORBIS_COMMENT':
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require_once(GETID3_INCLUDEPATH.'getid3.ogg.php');
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//ParseVorbisComments($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo, $METAdataBlockOffset, $fd);
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$OldOffset = ftell($fd);
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fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
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ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
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fseek($fd, $OldOffset, SEEK_SET);
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break;
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case 'CUESHEET':
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if (!FLACparseCUESHEET($ThisFileInfo['flac']["$METAdataBlockTypeText"]['raw']['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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default:
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$ThisFileInfo['warning'] .= "\n".'Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
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break;
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}
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} while ($METAdataLastBlockFlag === false);
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if (isset($ThisFileInfo['flac']['STREAMINFO'])) {
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$ThisFileInfo['flac']['compressed_audio_bytes'] = $ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset'];
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$ThisFileInfo['flac']['uncompressed_audio_bytes'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] * $ThisFileInfo['flac']['STREAMINFO']['channels'] * ($ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] / 8);
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if ($ThisFileInfo['flac']['uncompressed_audio_bytes'] == 0) {
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$ThisFileInfo['error'] .= "\n".'Corrupt FLAC file: uncompressed_audio_bytes == zero';
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return false;
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}
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$ThisFileInfo['flac']['compression_ratio'] = $ThisFileInfo['flac']['compressed_audio_bytes'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
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}
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// set md5_data - built into flac 0.5+
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if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
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if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat(chr(0), 16)) {
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$ThisFileInfo['warning'] .= "\n".'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC), using calculated md5_data';
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} else {
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$ThisFileInfo['md5_data'] = '';
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$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
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for ($i = 0; $i < strlen($md5); $i++) {
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$ThisFileInfo['md5_data'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
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}
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if (!preg_match('/^[0-9a-f]{32}$/', $ThisFileInfo['md5_data'])) {
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unset($ThisFileInfo['md5_data']);
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}
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}
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}
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$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
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if (!empty($ThisFileInfo['ogg']['vendor'])) {
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$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
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}
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return true;
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}
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function FLACmetaBlockTypeLookup($blocktype) {
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static $FLACmetaBlockTypeLookup = array();
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if (empty($FLACmetaBlockTypeLookup)) {
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$FLACmetaBlockTypeLookup[0] = 'STREAMINFO';
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$FLACmetaBlockTypeLookup[1] = 'PADDING';
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$FLACmetaBlockTypeLookup[2] = 'APPLICATION';
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$FLACmetaBlockTypeLookup[3] = 'SEEKTABLE';
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$FLACmetaBlockTypeLookup[4] = 'VORBIS_COMMENT';
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$FLACmetaBlockTypeLookup[5] = 'CUESHEET';
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}
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return (isset($FLACmetaBlockTypeLookup[$blocktype]) ? $FLACmetaBlockTypeLookup[$blocktype] : 'reserved');
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}
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function FLACapplicationIDLookup($applicationid) {
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static $FLACapplicationIDLookup = array();
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if (empty($FLACapplicationIDLookup)) {
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// http://flac.sourceforge.net/id.html
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$FLACapplicationIDLookup[0x46746F6C] = 'flac-tools'; // 'Ftol'
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$FLACapplicationIDLookup[0x46746F6C] = 'Sound Font FLAC'; // 'SFFL'
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}
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return (isset($FLACapplicationIDLookup[$applicationid]) ? $FLACapplicationIDLookup[$applicationid] : 'reserved');
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}
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function FLACparseSTREAMINFO($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$ThisFileInfo['flac']['STREAMINFO']['min_block_size'] = BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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$ThisFileInfo['flac']['STREAMINFO']['max_block_size'] = BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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$ThisFileInfo['flac']['STREAMINFO']['min_frame_size'] = BigEndian2Int(substr($METAdataBlockData, $offset, 3));
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$offset += 3;
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$ThisFileInfo['flac']['STREAMINFO']['max_frame_size'] = BigEndian2Int(substr($METAdataBlockData, $offset, 3));
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$offset += 3;
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$SampleRateChannelsSampleBitsStreamSamples = BigEndian2Bin(substr($METAdataBlockData, $offset, 8));
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$ThisFileInfo['flac']['STREAMINFO']['sample_rate'] = Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 0, 20));
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$ThisFileInfo['flac']['STREAMINFO']['channels'] = Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 20, 3)) + 1;
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$ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] = Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 23, 5)) + 1;
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$ThisFileInfo['flac']['STREAMINFO']['samples_stream'] = Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 28, 36));
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$offset += 8;
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$ThisFileInfo['flac']['STREAMINFO']['audio_signature'] = substr($METAdataBlockData, $offset, 16);
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$offset += 16;
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if (!empty($ThisFileInfo['flac']['STREAMINFO']['sample_rate'])) {
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$ThisFileInfo['audio']['bitrate_mode'] = 'vbr';
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$ThisFileInfo['audio']['sample_rate'] = $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
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$ThisFileInfo['audio']['channels'] = $ThisFileInfo['flac']['STREAMINFO']['channels'];
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$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
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$ThisFileInfo['playtime_seconds'] = $ThisFileInfo['flac']['STREAMINFO']['samples_stream'] / $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
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$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
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} else {
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$ThisFileInfo['error'] .= "\n".'Corrupt METAdata block: STREAMINFO';
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return false;
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}
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return true;
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}
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function FLACparseAPPLICATION($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$ApplicationID = BigEndian2Int(substr($METAdataBlockData, $offset, 4));
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$offset += 4;
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$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['name'] = FLACapplicationIDLookup($ApplicationID);
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$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['data'] = substr($METAdataBlockData, $offset);
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$offset = $METAdataBlockLength;
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return true;
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}
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function FLACparseSEEKTABLE($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$METAdataBlockLength = strlen($METAdataBlockData);
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$placeholderpattern = str_repeat(chr(0xFF), 8);
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while ($offset < $METAdataBlockLength) {
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$SampleNumberString = substr($METAdataBlockData, $offset, 8);
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$offset += 8;
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if ($SampleNumberString == $placeholderpattern) {
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// placeholder point
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safe_inc($ThisFileInfo['flac']['SEEKTABLE']['placeholders']);
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$offset += 10;
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} else {
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$SampleNumber = BigEndian2Int($SampleNumberString);
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$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['offset'] = BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['samples'] = BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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}
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}
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return true;
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}
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function FLACparseCUESHEET($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$ThisFileInfo['flac']['CUESHEET']['media_catalog_number'] = trim(substr($METAdataBlockData, $offset, 128), "\0");
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$offset += 128;
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$ThisFileInfo['flac']['CUESHEET']['lead_in_samples'] = BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$ThisFileInfo['flac']['CUESHEET']['flags']['is_cd'] = (bool) (BigEndian2Int(substr($METAdataBlockData, $offset, 1)) & 0x80);
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$offset += 1;
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$offset += 258; // reserved
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$ThisFileInfo['flac']['CUESHEET']['number_tracks'] = BigEndian2Int(substr($METAdataBlockData, $offset, 1));
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$offset += 1;
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for ($track = 0; $track < $ThisFileInfo['flac']['CUESHEET']['number_tracks']; $track++) {
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$TrackSampleOffset = BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$TrackNumber = BigEndian2Int(substr($METAdataBlockData, $offset, 1));
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$offset += 1;
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($METAdataBlockData, $offset, 12);
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$offset += 12;
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$TrackFlagsRaw = BigEndian2Int(substr($METAdataBlockData, $offset, 1));
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$offset += 1;
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
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$offset += 13; // reserved
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = BigEndian2Int(substr($METAdataBlockData, $offset, 1));
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$offset += 1;
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for ($index = 0; $index < $ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
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$IndexSampleOffset = BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$IndexNumber = BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 1;
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$offset += 3; // reserved
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
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}
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}
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return true;
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}
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?>
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