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520 lines
19 KiB
520 lines
19 KiB
<?php
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/////////////////////////////////////////////////////////////////
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/// getID3() by James Heinrich <info@getid3.org> //
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// available at https://github.com/JamesHeinrich/getID3 //
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// or https://www.getid3.org //
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// or http://getid3.sourceforge.net //
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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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if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
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exit;
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}
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getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.ogg.php', __FILE__, true);
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/**
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* @tutorial http://flac.sourceforge.net/format.html
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*/
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class getid3_flac extends getid3_handler
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{
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const syncword = 'fLaC';
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/**
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* @return bool
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*/
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public function Analyze() {
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$info = &$this->getid3->info;
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$this->fseek($info['avdataoffset']);
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$StreamMarker = $this->fread(4);
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if ($StreamMarker != self::syncword) {
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return $this->error('Expecting "'.getid3_lib::PrintHexBytes(self::syncword).'" at offset '.$info['avdataoffset'].', found "'.getid3_lib::PrintHexBytes($StreamMarker).'"');
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}
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$info['fileformat'] = 'flac';
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$info['audio']['dataformat'] = 'flac';
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$info['audio']['bitrate_mode'] = 'vbr';
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$info['audio']['lossless'] = true;
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// parse flac container
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return $this->parseMETAdata();
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}
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/**
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* @return bool
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*/
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public function parseMETAdata() {
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$info = &$this->getid3->info;
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do {
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$BlockOffset = $this->ftell();
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$BlockHeader = $this->fread(4);
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$LBFBT = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1)); // LBFBT = LastBlockFlag + BlockType
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$LastBlockFlag = (bool) ($LBFBT & 0x80);
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$BlockType = ($LBFBT & 0x7F);
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$BlockLength = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
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$BlockTypeText = self::metaBlockTypeLookup($BlockType);
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if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) {
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$this->warning('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file');
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break;
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}
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if ($BlockLength < 1) {
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if ($BlockTypeText != 'reserved') {
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// probably supposed to be zero-length
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$this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockTypeText.') at offset '.$BlockOffset.' is zero bytes');
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continue;
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}
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$this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid');
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break;
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}
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$info['flac'][$BlockTypeText]['raw'] = array();
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$BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw'];
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$BlockTypeText_raw['offset'] = $BlockOffset;
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$BlockTypeText_raw['last_meta_block'] = $LastBlockFlag;
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$BlockTypeText_raw['block_type'] = $BlockType;
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$BlockTypeText_raw['block_type_text'] = $BlockTypeText;
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$BlockTypeText_raw['block_length'] = $BlockLength;
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if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically
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$BlockTypeText_raw['block_data'] = $this->fread($BlockLength);
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}
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switch ($BlockTypeText) {
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case 'STREAMINFO': // 0x00
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if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) {
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return false;
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}
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break;
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case 'PADDING': // 0x01
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unset($info['flac']['PADDING']); // ignore
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break;
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case 'APPLICATION': // 0x02
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if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) {
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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 (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) {
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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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if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) {
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return false;
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}
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break;
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case 'CUESHEET': // 0x05
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if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) {
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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 (!$this->parsePICTURE()) {
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return false;
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}
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break;
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default:
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$this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset);
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}
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unset($info['flac'][$BlockTypeText]['raw']);
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$info['avdataoffset'] = $this->ftell();
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}
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while ($LastBlockFlag === false);
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// handle tags
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if (!empty($info['flac']['VORBIS_COMMENT']['comments'])) {
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$info['flac']['comments'] = $info['flac']['VORBIS_COMMENT']['comments'];
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}
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if (!empty($info['flac']['VORBIS_COMMENT']['vendor'])) {
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$info['audio']['encoder'] = str_replace('reference ', '', $info['flac']['VORBIS_COMMENT']['vendor']);
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}
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// copy attachments to 'comments' array if nesesary
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if (isset($info['flac']['PICTURE']) && ($this->getid3->option_save_attachments !== getID3::ATTACHMENTS_NONE)) {
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foreach ($info['flac']['PICTURE'] as $entry) {
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if (!empty($entry['data'])) {
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if (!isset($info['flac']['comments']['picture'])) {
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$info['flac']['comments']['picture'] = array();
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}
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$comments_picture_data = array();
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foreach (array('data', 'image_mime', 'image_width', 'image_height', 'imagetype', 'picturetype', 'description', 'datalength') as $picture_key) {
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if (isset($entry[$picture_key])) {
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$comments_picture_data[$picture_key] = $entry[$picture_key];
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}
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}
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$info['flac']['comments']['picture'][] = $comments_picture_data;
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unset($comments_picture_data);
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}
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}
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}
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if (isset($info['flac']['STREAMINFO'])) {
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if (!$this->isDependencyFor('matroska')) {
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$info['flac']['compressed_audio_bytes'] = $info['avdataend'] - $info['avdataoffset'];
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}
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$info['flac']['uncompressed_audio_bytes'] = $info['flac']['STREAMINFO']['samples_stream'] * $info['flac']['STREAMINFO']['channels'] * ($info['flac']['STREAMINFO']['bits_per_sample'] / 8);
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if ($info['flac']['uncompressed_audio_bytes'] == 0) {
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return $this->error('Corrupt FLAC file: uncompressed_audio_bytes == zero');
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}
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if (!empty($info['flac']['compressed_audio_bytes'])) {
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$info['flac']['compression_ratio'] = $info['flac']['compressed_audio_bytes'] / $info['flac']['uncompressed_audio_bytes'];
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}
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}
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// set md5_data_source - built into flac 0.5+
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if (isset($info['flac']['STREAMINFO']['audio_signature'])) {
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if ($info['flac']['STREAMINFO']['audio_signature'] === str_repeat("\x00", 16)) {
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$this->warning('FLAC STREAMINFO.audio_signature is null (known issue with libOggFLAC)');
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}
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else {
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$info['md5_data_source'] = '';
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$md5 = $info['flac']['STREAMINFO']['audio_signature'];
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for ($i = 0; $i < strlen($md5); $i++) {
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$info['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}$/', $info['md5_data_source'])) {
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unset($info['md5_data_source']);
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}
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}
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}
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if (isset($info['flac']['STREAMINFO']['bits_per_sample'])) {
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$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
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if ($info['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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$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');
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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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* @param string $BlockData
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*
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* @return array
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*/
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public static function parseSTREAMINFOdata($BlockData) {
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$streaminfo = array();
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$streaminfo['min_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 0, 2));
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$streaminfo['max_block_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 2, 2));
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$streaminfo['min_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 4, 3));
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$streaminfo['max_frame_size'] = getid3_lib::BigEndian2Int(substr($BlockData, 7, 3));
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$SRCSBSS = getid3_lib::BigEndian2Bin(substr($BlockData, 10, 8));
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$streaminfo['sample_rate'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 0, 20));
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$streaminfo['channels'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 20, 3)) + 1;
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$streaminfo['bits_per_sample'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 23, 5)) + 1;
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$streaminfo['samples_stream'] = getid3_lib::Bin2Dec(substr($SRCSBSS, 28, 36));
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$streaminfo['audio_signature'] = substr($BlockData, 18, 16);
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return $streaminfo;
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}
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/**
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* @param string $BlockData
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*
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* @return bool
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*/
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private function parseSTREAMINFO($BlockData) {
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$info = &$this->getid3->info;
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$info['flac']['STREAMINFO'] = self::parseSTREAMINFOdata($BlockData);
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if (!empty($info['flac']['STREAMINFO']['sample_rate'])) {
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$info['audio']['bitrate_mode'] = 'vbr';
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$info['audio']['sample_rate'] = $info['flac']['STREAMINFO']['sample_rate'];
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$info['audio']['channels'] = $info['flac']['STREAMINFO']['channels'];
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$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
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$info['playtime_seconds'] = $info['flac']['STREAMINFO']['samples_stream'] / $info['flac']['STREAMINFO']['sample_rate'];
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if ($info['playtime_seconds'] > 0) {
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if (!$this->isDependencyFor('matroska')) {
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$info['audio']['bitrate'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / $info['playtime_seconds'];
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}
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else {
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$this->warning('Cannot determine audio bitrate because total stream size is unknown');
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}
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}
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} else {
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return $this->error('Corrupt METAdata block: STREAMINFO');
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}
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return true;
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}
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/**
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* @param string $BlockData
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*
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* @return bool
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*/
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private function parseAPPLICATION($BlockData) {
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$info = &$this->getid3->info;
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$ApplicationID = getid3_lib::BigEndian2Int(substr($BlockData, 0, 4));
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$info['flac']['APPLICATION'][$ApplicationID]['name'] = self::applicationIDLookup($ApplicationID);
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$info['flac']['APPLICATION'][$ApplicationID]['data'] = substr($BlockData, 4);
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return true;
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}
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/**
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* @param string $BlockData
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*
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* @return bool
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*/
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private function parseSEEKTABLE($BlockData) {
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$info = &$this->getid3->info;
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$offset = 0;
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$BlockLength = strlen($BlockData);
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$placeholderpattern = str_repeat("\xFF", 8);
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while ($offset < $BlockLength) {
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$SampleNumberString = substr($BlockData, $offset, 8);
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$offset += 8;
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if ($SampleNumberString == $placeholderpattern) {
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// placeholder point
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getid3_lib::safe_inc($info['flac']['SEEKTABLE']['placeholders'], 1);
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$offset += 10;
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} else {
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$SampleNumber = getid3_lib::BigEndian2Int($SampleNumberString);
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$info['flac']['SEEKTABLE'][$SampleNumber]['offset'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
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$offset += 8;
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$info['flac']['SEEKTABLE'][$SampleNumber]['samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 2));
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$offset += 2;
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}
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}
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return true;
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}
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/**
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* @param string $BlockData
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*
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* @return bool
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*/
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private function parseVORBIS_COMMENT($BlockData) {
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$info = &$this->getid3->info;
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$getid3_ogg = new getid3_ogg($this->getid3);
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if ($this->isDependencyFor('matroska')) {
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$getid3_ogg->setStringMode($this->data_string);
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}
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$getid3_ogg->ParseVorbisComments();
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if (isset($info['ogg'])) {
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unset($info['ogg']['comments_raw']);
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$info['flac']['VORBIS_COMMENT'] = $info['ogg'];
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unset($info['ogg']);
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}
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unset($getid3_ogg);
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return true;
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}
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/**
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* @param string $BlockData
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*
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* @return bool
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*/
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private function parseCUESHEET($BlockData) {
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$info = &$this->getid3->info;
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$offset = 0;
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$info['flac']['CUESHEET']['media_catalog_number'] = trim(substr($BlockData, $offset, 128), "\0");
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$offset += 128;
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$info['flac']['CUESHEET']['lead_in_samples'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
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$offset += 8;
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$info['flac']['CUESHEET']['flags']['is_cd'] = (bool) (getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1)) & 0x80);
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$offset += 1;
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$offset += 258; // reserved
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$info['flac']['CUESHEET']['number_tracks'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
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$offset += 1;
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for ($track = 0; $track < $info['flac']['CUESHEET']['number_tracks']; $track++) {
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$TrackSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
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$offset += 8;
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$TrackNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
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$offset += 1;
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['sample_offset'] = $TrackSampleOffset;
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['isrc'] = substr($BlockData, $offset, 12);
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$offset += 12;
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$TrackFlagsRaw = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
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$offset += 1;
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['is_audio'] = (bool) ($TrackFlagsRaw & 0x80);
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['flags']['pre_emphasis'] = (bool) ($TrackFlagsRaw & 0x40);
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$offset += 13; // reserved
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points'] = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
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$offset += 1;
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for ($index = 0; $index < $info['flac']['CUESHEET']['tracks'][$TrackNumber]['index_points']; $index++) {
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$IndexSampleOffset = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 8));
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$offset += 8;
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$IndexNumber = getid3_lib::BigEndian2Int(substr($BlockData, $offset, 1));
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$offset += 1;
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$offset += 3; // reserved
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$info['flac']['CUESHEET']['tracks'][$TrackNumber]['indexes'][$IndexNumber] = $IndexSampleOffset;
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}
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}
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return true;
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}
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/**
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* Parse METADATA_BLOCK_PICTURE flac structure and extract attachment
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* External usage: audio.ogg
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*
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* @return bool
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*/
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public function parsePICTURE() {
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$info = &$this->getid3->info;
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$picture = array();
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$picture['typeid'] = getid3_lib::BigEndian2Int($this->fread(4));
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$picture['picturetype'] = self::pictureTypeLookup($picture['typeid']);
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$picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4)));
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$descr_length = getid3_lib::BigEndian2Int($this->fread(4));
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if ($descr_length) {
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$picture['description'] = $this->fread($descr_length);
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}
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$picture['image_width'] = getid3_lib::BigEndian2Int($this->fread(4));
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$picture['image_height'] = getid3_lib::BigEndian2Int($this->fread(4));
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$picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4));
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$picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));
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$picture['datalength'] = getid3_lib::BigEndian2Int($this->fread(4));
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if ($picture['image_mime'] == '-->') {
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$picture['data'] = $this->fread($picture['datalength']);
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} else {
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$picture['data'] = $this->saveAttachment(
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str_replace('/', '_', $picture['picturetype']).'_'.$this->ftell(),
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$this->ftell(),
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$picture['datalength'],
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$picture['image_mime']);
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}
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$info['flac']['PICTURE'][] = $picture;
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return true;
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}
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/**
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* @param int $blocktype
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*
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* @return string
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*/
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public static function metaBlockTypeLookup($blocktype) {
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static $lookup = array(
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0 => 'STREAMINFO',
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1 => 'PADDING',
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2 => 'APPLICATION',
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3 => 'SEEKTABLE',
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4 => 'VORBIS_COMMENT',
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5 => 'CUESHEET',
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6 => 'PICTURE',
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);
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return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved');
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}
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/**
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* @param int $applicationid
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*
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* @return string
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*/
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public static function applicationIDLookup($applicationid) {
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// http://flac.sourceforge.net/id.html
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static $lookup = array(
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0x41544348 => 'FlacFile', // "ATCH"
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0x42534F4C => 'beSolo', // "BSOL"
|
|
0x42554753 => 'Bugs Player', // "BUGS"
|
|
0x43756573 => 'GoldWave cue points (specification)', // "Cues"
|
|
0x46696361 => 'CUE Splitter', // "Fica"
|
|
0x46746F6C => 'flac-tools', // "Ftol"
|
|
0x4D4F5442 => 'MOTB MetaCzar', // "MOTB"
|
|
0x4D505345 => 'MP3 Stream Editor', // "MPSE"
|
|
0x4D754D4C => 'MusicML: Music Metadata Language', // "MuML"
|
|
0x52494646 => 'Sound Devices RIFF chunk storage', // "RIFF"
|
|
0x5346464C => 'Sound Font FLAC', // "SFFL"
|
|
0x534F4E59 => 'Sony Creative Software', // "SONY"
|
|
0x5351455A => 'flacsqueeze', // "SQEZ"
|
|
0x54745776 => 'TwistedWave', // "TtWv"
|
|
0x55495453 => 'UITS Embedding tools', // "UITS"
|
|
0x61696666 => 'FLAC AIFF chunk storage', // "aiff"
|
|
0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', // "imag"
|
|
0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // "peem"
|
|
0x71667374 => 'QFLAC Studio', // "qfst"
|
|
0x72696666 => 'FLAC RIFF chunk storage', // "riff"
|
|
0x74756E65 => 'TagTuner', // "tune"
|
|
0x78626174 => 'XBAT', // "xbat"
|
|
0x786D6364 => 'xmcd', // "xmcd"
|
|
);
|
|
return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved');
|
|
}
|
|
|
|
/**
|
|
* @param int $type_id
|
|
*
|
|
* @return string
|
|
*/
|
|
public static function pictureTypeLookup($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');
|
|
}
|
|
|
|
}
|