--- /dev/null
+<?php
+/////////////////////////////////////////////////////////////////
+/// getID3() by James Heinrich <info@getid3.org> //
+// available at http://getid3.sourceforge.net //
+// or http://www.getid3.org //
+/////////////////////////////////////////////////////////////////
+// See readme.txt for more details //
+/////////////////////////////////////////////////////////////////
+// //
+// module.audio.flac.php //
+// module for analyzing FLAC and OggFLAC audio files //
+// dependencies: module.audio.ogg.php //
+// ///
+/////////////////////////////////////////////////////////////////
+
+
+getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
+
+/**
+* @tutorial http://flac.sourceforge.net/format.html
+*/
+class getid3_flac extends getid3_handler
+{
+ const syncword = 'fLaC';
+
+ public function Analyze() {
+ $info = &$this->getid3->info;
+
+ $this->fseek($info['avdataoffset']);
+ $StreamMarker = $this->fread(4);
+ if ($StreamMarker != self::syncword) {
+ return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($StreamMarker).'"');
+ }
+ $info['fileformat'] = 'flac';
+ $info['audio']['dataformat'] = 'flac';
+ $info['audio']['bitrate_mode'] = 'vbr';
+ $info['audio']['lossless'] = true;
+
+ // parse flac container
+ return $this->parseMETAdata();
+ }
+
+ public function parseMETAdata() {
+ $info = &$this->getid3->info;
+ do {
+ $BlockOffset = $this->ftell();
+ $BlockHeader = $this->fread(4);
+ $LBFBT = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));
+ $LastBlockFlag = (bool) ($LBFBT & 0x80);
+ $BlockType = ($LBFBT & 0x7F);
+ $BlockLength = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
+ $BlockTypeText = self::metaBlockTypeLookup($BlockType);
+
+ if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) {
+ $this->error('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file');
+ break;
+ }
+ if ($BlockLength < 1) {
+ $this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid');
+ break;
+ }
+
+ $info['flac'][$BlockTypeText]['raw'] = array();
+ $BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw'];
+
+ $BlockTypeText_raw['offset'] = $BlockOffset;
+ $BlockTypeText_raw['last_meta_block'] = $LastBlockFlag;
+ $BlockTypeText_raw['block_type'] = $BlockType;
+ $BlockTypeText_raw['block_type_text'] = $BlockTypeText;
+ $BlockTypeText_raw['block_length'] = $BlockLength;
+ if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically
+ $BlockTypeText_raw['block_data'] = $this->fread($BlockLength);
+ }
+
+ switch ($BlockTypeText) {
+ case 'STREAMINFO': // 0x00
+ if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) {
+ return false;
+ }
+ break;
+
+ case 'PADDING': // 0x01
+ unset($info['flac']['PADDING']); // ignore
+ break;
+
+ case 'APPLICATION': // 0x02
+ if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) {
+ return false;
+ }
+ break;
+
+ case 'SEEKTABLE': // 0x03
+ if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) {
+ return false;
+ }
+ break;
+
+ case 'VORBIS_COMMENT': // 0x04
+ if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) {
+ return false;
+ }
+ break;
+
+ case 'CUESHEET': // 0x05
+ if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) {
+ return false;
+ }
+ break;
+
+ case 'PICTURE': // 0x06
+ if (!$this->parsePICTURE()) {
+ return false;
+ }
+ break;
+
+ default:
+ $this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset);
+ }
+
+ unset($info['flac'][$BlockTypeText]['raw']);
+ $info['avdataoffset'] = $this->ftell();
+ }
+ while ($LastBlockFlag === false);
+
+ // handle tags
+ if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) {
+ $info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments'];
+ }
+ if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) {
+ $info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']);
+ }
+
+ // copy attachments to 'comments' array if nesesary
+ if (isset($info['flac']['PICTURE']) && ($this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE)) {
+ foreach ($info['flac']['PICTURE'] as $entry) {
+ if (!empty($entry['data'])) {
+ $info['flac']['comments']['picture'][] = array('image_mime'=>$entry['image_mime'], 'data'=>$entry['data']);
+ }
+ }
+ }
+
+ if (isset($info['flac']['STREAMINFO'])) {
+ if (!$this->isDependencyFor('matroska')) {
+ $info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset'];
+ }
+ $info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8);
+ if ($info['flac']['uncompressed_audio_bytes'] == 0) {
+ return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero');
+ }
+ if (!empty($info['flac']['compressed_audio_bytes'])) {
+ $info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes'];
+ }
+ }
+
+ // set md5_data_source - built into flac 0.5+
+ if (isset($info['flac']['STREAMINFO']['audio_signature'])) {
+
+ if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
+ $this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)');
+ }
+ else {
+ $info['md5_data_source'] = '';
+ $md5 = $info['flac']['STREAMINFO']['audio_signature'];
+ for ($i = 0; $i < strlen($md5); $i++) {
+ $info['md5_data_source'] .= str_pad(dechex(ord($md5[$i])), 2, '00', STR_PAD_LEFT);
+ }
+ if (!preg_match('/^[0-9a-f]{32}$/', $info['md5_data_source'])) {
+ unset($info['md5_data_source']);
+ }
+ }
+ }
+
+ if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) {
+ $info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
+ if ($info['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
+ $this->warning('FLAC calculates MD5 data strangely on 8-bit audio, so the stored md5_data_source value will not match the decoded WAV file');
+ }
+ }
+
+ return true;
+ }
+
+ private function parseSTREAMINFO($BlockData) {
+ $info = &$this->getid3->info;
+
+ $info['flac']['STREAMINFO'] = array();
+ $streaminfo = &$info['flac']['STREAMINFO'];
+
+ $streaminfo['min_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2));
+ $streaminfo['max_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2));
+ $streaminfo['min_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3));
+ $streaminfo['max_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3));
+
+ $SRCSBSS = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8));
+ $streaminfo['sample_rate'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 0, 20));
+ $streaminfo['channels'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 20, 3)) + 1;
+ $streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23, 5)) + 1;
+ $streaminfo['samples_stream'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36));
+
+ $streaminfo['audio_signature'] = substr($BlockData, 18, 16);
+
+ if (!empty($streaminfo['sample_rate'])) {
+
+ $info['audio']['bitrate_mode'] = 'vbr';
+ $info['audio']['sample_rate'] = $streaminfo['sample_rate'];
+ $info['audio']['channels'] = $streaminfo['channels'];
+ $info['audio']['bits_per_sample'] = $streaminfo['bits_per_sample'];
+ $info['playtime_seconds'] = $streaminfo['samples_stream'] / $streaminfo['sample_rate'];
+ if ($info['playtime_seconds'] > 0) {
+ if (!$this->isDependencyFor('matroska')) {
+ $info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
+ }
+ else {
+ $this->warning('Cannot determine audio bitrate because total stream size is unknown');
+ }
+ }
+
+ } else {
+ return $this->error('Corrupt METAdata block: STREAMINFO');
+ }
+
+ return true;
+ }
+
+ private function parseAPPLICATION($BlockData) {
+ $info = &$this->getid3->info;
+
+ $ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4));
+ $info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID);
+ $info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4);
+
+ return true;
+ }
+
+ private function parseSEEKTABLE($BlockData) {
+ $info = &$this->getid3->info;
+
+ $offset = 0;
+ $BlockLength = strlen($BlockData);
+ $placeholderpattern = str_repeat("\xFF", 8);
+ while ($offset < $BlockLength) {
+ $SampleNumberString = substr($BlockData, $offset, 8);
+ $offset += 8;
+ if ($SampleNumberString == $placeholderpattern) {
+
+ // placeholder point
+ getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1);
+ $offset += 10;
+
+ } else {
+
+ $SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
+ $info['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
+ $offset += 8;
+ $info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2));
+ $offset += 2;
+
+ }
+ }
+
+ return true;
+ }
+
+ private function parseVORBIS_COMMENT($BlockData) {
+ $info = &$this->getid3->info;
+
+ $getid3_ogg = new getid3_ogg($this->getid3);
+ if ($this->isDependencyFor('matroska')) {
+ $getid3_ogg->setStringMode($this->data_string);
+ }
+ $getid3_ogg->ParseVorbisComments();
+ if (isset($info['ogg'])) {
+ unset($info['ogg']['comments_raw']);
+ $info['flac']['VORBIS_COMMENT'] = $info['ogg'];
+ unset($info['ogg']);
+ }
+
+ unset($getid3_ogg);
+
+ return true;
+ }
+
+ private function parseCUESHEET($BlockData) {
+ $info = &$this->getid3->info;
+ $offset = 0;
+ $info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($BlockData, $offset, 128), "\0");
+ $offset += 128;
+ $info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
+ $offset += 8;
+ $info['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80);
+ $offset += 1;
+
+ $offset += 258; // reserved
+
+ $info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
+ $offset += 1;
+
+ for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) {
+ $TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
+ $offset += 8;
+ $TrackNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
+ $offset += 1;
+
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
+
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($BlockData, $offset, 12);
+ $offset += 12;
+
+ $TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
+ $offset += 1;
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
+
+ $offset += 13; // reserved
+
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
+ $offset += 1;
+
+ for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
+ $IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
+ $offset += 8;
+ $IndexNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
+ $offset += 1;
+
+ $offset += 3; // reserved
+
+ $info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
+ }
+ }
+
+ return true;
+ }
+
+ /**
+ * Parse METADATA_BLOCK_PICTURE flac structure and extract attachment
+ * External usage: audio.ogg
+ */
+ public function parsePICTURE() {
+ $info = &$this->getid3->info;
+
+ $picture['typeid'] = getid3_lib::BigEndian2Int($this->fread(4));
+ $picture['type'] = self::pictureTypeLookup($picture['typeid']);
+ $picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4)));
+ $descr_length = getid3_lib::BigEndian2Int($this->fread(4));
+ if ($descr_length) {
+ $picture['description'] = $this->fread($descr_length);
+ }
+ $picture['width'] = getid3_lib::BigEndian2Int($this->fread(4));
+ $picture['height'] = getid3_lib::BigEndian2Int($this->fread(4));
+ $picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4));
+ $picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));
+ $data_length = getid3_lib::BigEndian2Int($this->fread(4));
+
+ if ($picture['image_mime'] == '-->') {
+ $picture['data'] = $this->fread($data_length);
+ } else {
+ $picture['data'] = $this->saveAttachment(
+ str_replace('/', '_', $picture['type']).'_'.$this->ftell(),
+ $this->ftell(),
+ $data_length,
+ $picture['image_mime']);
+ }
+
+ $info['flac']['PICTURE'][] = $picture;
+
+ return true;
+ }
+
+ public static function metaBlockTypeLookup($blocktype) {
+ static $lookup = array(
+ 0 => 'STREAMINFO',
+ 1 => 'PADDING',
+ 2 => 'APPLICATION',
+ 3 => 'SEEKTABLE',
+ 4 => 'VORBIS_COMMENT',
+ 5 => 'CUESHEET',
+ 6 => 'PICTURE',
+ );
+ return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved');
+ }
+
+ public static function applicationIDLookup($applicationid) {
+ // http://flac.sourceforge.net/id.html
+ static $lookup = array(
+ 0x41544348 => 'FlacFile', // "ATCH"
+ 0x42534F4C => 'beSolo', // "BSOL"
+ 0x42554753 => 'Bugs Player', // "BUGS"
+ 0x43756573 => 'GoldWave cue points (specification)', // "Cues"
+ 0x46696361 => 'CUE Splitter', // "Fica"
+ 0x46746F6C => 'flac-tools', // "Ftol"
+ 0x4D4F5442 => 'MOTB MetaCzar', // "MOTB"
+ 0x4D505345 => 'MP3 Stream Editor', // "MPSE"
+ 0x4D754D4C => 'MusicML: Music Metadata Language', // "MuML"
+ 0x52494646 => 'Sound Devices RIFF chunk storage', // "RIFF"
+ 0x5346464C => 'Sound Font FLAC', // "SFFL"
+ 0x534F4E59 => 'Sony Creative Software', // "SONY"
+ 0x5351455A => 'flacsqueeze', // "SQEZ"
+ 0x54745776 => 'TwistedWave', // "TtWv"
+ 0x55495453 => 'UITS Embedding tools', // "UITS"
+ 0x61696666 => 'FLAC AIFF chunk storage', // "aiff"
+ 0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', // "imag"
+ 0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // "peem"
+ 0x71667374 => 'QFLAC Studio', // "qfst"
+ 0x72696666 => 'FLAC RIFF chunk storage', // "riff"
+ 0x74756E65 => 'TagTuner', // "tune"
+ 0x78626174 => 'XBAT', // "xbat"
+ 0x786D6364 => 'xmcd', // "xmcd"
+ );
+ return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved');
+ }
+
+ public static function pictureTypeLookup($type_id) {
+ static $lookup = array (
+ 0 => 'Other',
+ 1 => '32x32 pixels \'file icon\' (PNG only)',
+ 2 => 'Other file icon',
+ 3 => 'Cover (front)',
+ 4 => 'Cover (back)',
+ 5 => 'Leaflet page',
+ 6 => 'Media (e.g. label side of CD)',
+ 7 => 'Lead artist/lead performer/soloist',
+ 8 => 'Artist/performer',
+ 9 => 'Conductor',
+ 10 => 'Band/Orchestra',
+ 11 => 'Composer',
+ 12 => 'Lyricist/text writer',
+ 13 => 'Recording Location',
+ 14 => 'During recording',
+ 15 => 'During performance',
+ 16 => 'Movie/video screen capture',
+ 17 => 'A bright coloured fish',
+ 18 => 'Illustration',
+ 19 => 'Band/artist logotype',
+ 20 => 'Publisher/Studio logotype',
+ );
+ return (isset($lookup[$type_id]) ? $lookup[$type_id] : 'reserved');
+ }
+
+}
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