403 lines
16 KiB
PHP
403 lines
16 KiB
PHP
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at http://getid3.sourceforge.net //
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// or http://www.getid3.org //
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/////////////////////////////////////////////////////////////////
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// See readme.txt for more details //
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/////////////////////////////////////////////////////////////////
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// //
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// module.audio.flac.php //
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// module for analyzing FLAC and OggFLAC audio files //
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// dependencies: module.audio.ogg.php //
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// ///
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/////////////////////////////////////////////////////////////////
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getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
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class getid3_flac
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{
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function getid3_flac(&$fd, &$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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$ThisFileInfo['error'][] = 'Expecting "fLaC" at offset '.$ThisFileInfo['avdataoffset'].', 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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$ThisFileInfo['audio']['lossless'] = true;
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return getid3_flac::FLACparseMETAdata($fd, $ThisFileInfo);
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}
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static function FLACparseMETAdata(&$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) (getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x80);
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$METAdataBlockType = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 0, 1)) & 0x7F;
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$METAdataBlockLength = getid3_lib::BigEndian2Int(substr($METAdataBlockHeader, 1, 3));
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$METAdataBlockTypeText = getid3_flac::FLACmetaBlockTypeLookup($METAdataBlockType);
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if ($METAdataBlockLength < 0) {
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$ThisFileInfo['error'][] = 'corrupt or invalid METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$METAdataBlockType.') at offset '.$METAdataBlockOffset;
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break;
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}
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$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'] = array();
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$ThisFileInfo_flac_METAdataBlockTypeText_raw = &$ThisFileInfo['flac'][$METAdataBlockTypeText]['raw'];
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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'] = $METAdataBlockLength;
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ob_start();
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$ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'] = fread($fd, $METAdataBlockLength);
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$errormessage = ob_get_contents();
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ob_end_clean();
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$ThisFileInfo['avdataoffset'] = ftell($fd);
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switch ($METAdataBlockTypeText) {
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case 'STREAMINFO': // 0x00
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if (!getid3_flac::FLACparseSTREAMINFO($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'PADDING': // 0x01
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// ignore
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break;
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case 'APPLICATION': // 0x02
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if (!getid3_flac::FLACparseAPPLICATION($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'SEEKTABLE': // 0x03
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if (!getid3_flac::FLACparseSEEKTABLE($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'VORBIS_COMMENT': // 0x04
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$OldOffset = ftell($fd);
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fseek($fd, 0 - $METAdataBlockLength, SEEK_CUR);
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getid3_ogg::ParseVorbisCommentsFilepointer($fd, $ThisFileInfo);
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fseek($fd, $OldOffset, SEEK_SET);
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break;
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case 'CUESHEET': // 0x05
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if (!getid3_flac::FLACparseCUESHEET($ThisFileInfo_flac_METAdataBlockTypeText_raw['block_data'], $ThisFileInfo)) {
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return false;
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}
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break;
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case 'PICTURE': // 0x06
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if (!getid3_flac::FLACparsePICTURE($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'][] = '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'][] = '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'] / $ThisFileInfo['flac']['uncompressed_audio_bytes'];
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}
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// set md5_data_source - built into flac 0.5+
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if (isset($ThisFileInfo['flac']['STREAMINFO']['audio_signature'])) {
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if ($ThisFileInfo['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
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$ThisFileInfo['warning'][] = 'FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)';
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} else {
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$ThisFileInfo['md5_data_source'] = '';
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$md5 = $ThisFileInfo['flac']['STREAMINFO']['audio_signature'];
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for ($i = 0; $i < strlen($md5); $i++) {
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$ThisFileInfo['md5_data_source'] .= 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}$/', $ThisFileInfo['md5_data_source'])) {
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unset($ThisFileInfo['md5_data_source']);
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}
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}
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}
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$ThisFileInfo['audio']['bits_per_sample'] = $ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'];
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if ($ThisFileInfo['audio']['bits_per_sample'] == 8) {
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// special case
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// must invert sign bit on all data bytes before MD5'ing to match FLAC's calculated value
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// MD5sum calculates on unsigned bytes, but FLAC calculated MD5 on 8-bit audio data as signed
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$ThisFileInfo['warning'][] = 'FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file';
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}
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if (!empty($ThisFileInfo['ogg']['vendor'])) {
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$ThisFileInfo['audio']['encoder'] = $ThisFileInfo['ogg']['vendor'];
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}
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return true;
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}
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static function FLACmetaBlockTypeLookup($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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$FLACmetaBlockTypeLookup[6] = 'PICTURE';
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}
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return (isset($FLACmetaBlockTypeLookup[$blocktype]) ? $FLACmetaBlockTypeLookup[$blocktype] : 'reserved');
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}
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static 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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static function FLACpictureTypeLookup($type_id) {
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static $lookup = array (
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0 => 'Other',
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1 => '32x32 pixels \'file icon\' (PNG only)',
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2 => 'Other file icon',
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3 => 'Cover (front)',
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4 => 'Cover (back)',
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5 => 'Leaflet page',
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6 => 'Media (e.g. label side of CD)',
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7 => 'Lead artist/lead performer/soloist',
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8 => 'Artist/performer',
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9 => 'Conductor',
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10 => 'Band/Orchestra',
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11 => 'Composer',
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12 => 'Lyricist/text writer',
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13 => 'Recording Location',
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14 => 'During recording',
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15 => 'During performance',
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16 => 'Movie/video screen capture',
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17 => 'A bright coloured fish',
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18 => 'Illustration',
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19 => 'Band/artist logotype',
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20 => 'Publisher/Studio logotype',
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);
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return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved');
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}
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static function FLACparseSTREAMINFO($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$ThisFileInfo['flac']['STREAMINFO']['min_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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$ThisFileInfo['flac']['STREAMINFO']['max_block_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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$ThisFileInfo['flac']['STREAMINFO']['min_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
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$offset += 3;
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$ThisFileInfo['flac']['STREAMINFO']['max_frame_size'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 3));
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$offset += 3;
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$SampleRateChannelsSampleBitsStreamSamples = getid3_lib::BigEndian2Bin(substr($METAdataBlockData, $offset, 8));
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$ThisFileInfo['flac']['STREAMINFO']['sample_rate'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 0, 20));
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$ThisFileInfo['flac']['STREAMINFO']['channels'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 20, 3)) + 1;
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$ThisFileInfo['flac']['STREAMINFO']['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SampleRateChannelsSampleBitsStreamSamples, 23, 5)) + 1;
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$ThisFileInfo['flac']['STREAMINFO']['samples_stream'] = getid3_lib::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'] / $ThisFileInfo['flac']['STREAMINFO']['sample_rate'];
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if ($ThisFileInfo['playtime_seconds'] > 0) {
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$ThisFileInfo['audio']['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds'];
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}
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} else {
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$ThisFileInfo['error'][] = 'Corrupt METAdata block: STREAMINFO';
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return false;
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}
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unset($ThisFileInfo['flac']['STREAMINFO']['raw']);
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return true;
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}
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static function FLACparseAPPLICATION($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$ApplicationID = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 4));
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$offset += 4;
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$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['name'] = getid3_flac::FLACapplicationIDLookup($ApplicationID);
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$ThisFileInfo['flac']['APPLICATION'][$ApplicationID]['data'] = substr($METAdataBlockData, $offset);
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$offset = $METAdataBlockLength;
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unset($ThisFileInfo['flac']['APPLICATION']['raw']);
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return true;
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}
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static function FLACparseSEEKTABLE($METAdataBlockData, &$ThisFileInfo) {
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$offset = 0;
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$METAdataBlockLength = strlen($METAdataBlockData);
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$placeholderpattern = str_repeat("\xFF", 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 == $placeholderpattern) {
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// placeholder point
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getid3_lib::safe_inc($ThisFileInfo['flac']['SEEKTABLE']['placeholders'], 1);
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$offset += 10;
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} else {
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$SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
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$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$ThisFileInfo['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 2));
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$offset += 2;
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}
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}
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unset($ThisFileInfo['flac']['SEEKTABLE']['raw']);
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return true;
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}
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static function FLACparseCUESHEET($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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$ThisFileInfo['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$ThisFileInfo['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($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'] = getid3_lib::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 = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$TrackNumber = getid3_lib::BigEndian2Int(substr($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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$TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($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'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($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 = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 8));
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$offset += 8;
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$IndexNumber = getid3_lib::BigEndian2Int(substr($METAdataBlockData, $offset, 1));
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$offset += 1;
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$offset += 3; // reserved
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$ThisFileInfo['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
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}
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}
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unset($ThisFileInfo['flac']['CUESHEET']['raw']);
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return true;
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}
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static function FLACparsePICTURE($meta_data_block_data, &$ThisFileInfo) {
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$picture = &$ThisFileInfo['flac']['PICTURE'][sizeof($ThisFileInfo['flac']['PICTURE']) - 1];
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$offset = 0;
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$picture['typeid'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$picture['type'] = getid3_flac::FLACpictureTypeLookup($picture['typeid']);
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$offset += 4;
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$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['mime_type'] = substr($meta_data_block_data, $offset, $length);
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$offset += $length;
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$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['description'] = substr($meta_data_block_data, $offset, $length);
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$offset += $length;
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$picture['width'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['height'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['color_depth'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['colors_indexed'] = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$length = getid3_lib::BigEndian2Int(substr($meta_data_block_data, $offset, 4));
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$offset += 4;
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$picture['image_data'] = substr($meta_data_block_data, $offset, $length);
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$offset += $length;
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$picture['data_length'] = strlen($picture['image_data']);
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unset($ThisFileInfo['flac']['PICTURE']['raw']);
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return true;
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}
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}
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?>
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