<?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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[265] Fix | Delete

/**

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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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[280] Fix | Delete

/**

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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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[379] Fix | Delete

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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[394] Fix | Delete

/**

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* Parse METADATA_BLOCK_PICTURE flac structure and extract attachment

[396] Fix | Delete

* External usage: audio.ogg

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*

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* @return bool

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*/

[400] Fix | Delete

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));

[405] Fix | Delete

$picture['picturetype'] = self::pictureTypeLookup($picture['typeid']);

[406] Fix | Delete

$picture['image_mime'] = $this->fread(getid3_lib::BigEndian2Int($this->fread(4)));

[407] Fix | Delete

$descr_length = getid3_lib::BigEndian2Int($this->fread(4));

[408] Fix | Delete

if ($descr_length) {

[409] Fix | Delete

$picture['description'] = $this->fread($descr_length);

[410] Fix | Delete

}

[411] Fix | Delete

$picture['image_width'] = getid3_lib::BigEndian2Int($this->fread(4));

[412] Fix | Delete

$picture['image_height'] = getid3_lib::BigEndian2Int($this->fread(4));

[413] Fix | Delete

$picture['color_depth'] = getid3_lib::BigEndian2Int($this->fread(4));

[414] Fix | Delete

$picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));

[415] Fix | Delete

$picture['datalength'] = getid3_lib::BigEndian2Int($this->fread(4));

[416] Fix | Delete

[417] Fix | Delete

if ($picture['image_mime'] == '-->') {

[418] Fix | Delete

$picture['data'] = $this->fread($picture['datalength']);

[419] Fix | Delete

} else {

[420] Fix | Delete

$picture['data'] = $this->saveAttachment(

[421] Fix | Delete

str_replace('/', '_', $picture['picturetype']).'_'.$this->ftell(),

[422] Fix | Delete

$this->ftell(),

[423] Fix | Delete

$picture['datalength'],

[424] Fix | Delete

$picture['image_mime']);

[425] Fix | Delete

}

[426] Fix | Delete

[427] Fix | Delete

$info['flac']['PICTURE'][] = $picture;

[428] Fix | Delete

[429] Fix | Delete

return true;

[430] Fix | Delete

}

[431] Fix | Delete

[432] Fix | Delete

/**

[433] Fix | Delete

* @param int $blocktype

[434] Fix | Delete

*

[435] Fix | Delete

* @return string

[436] Fix | Delete

*/

[437] Fix | Delete

public static function metaBlockTypeLookup($blocktype) {

[438] Fix | Delete

static $lookup = array(

[439] Fix | Delete

0 => 'STREAMINFO',

[440] Fix | Delete

1 => 'PADDING',

[441] Fix | Delete

2 => 'APPLICATION',

[442] Fix | Delete

3 => 'SEEKTABLE',

[443] Fix | Delete

4 => 'VORBIS_COMMENT',

[444] Fix | Delete

5 => 'CUESHEET',

[445] Fix | Delete

6 => 'PICTURE',

[446] Fix | Delete

);

[447] Fix | Delete

return (isset($lookup[$blocktype]) ? $lookup[$blocktype] : 'reserved');

[448] Fix | Delete

}

[449] Fix | Delete

[450] Fix | Delete

/**

[451] Fix | Delete

* @param int $applicationid

[452] Fix | Delete

*

[453] Fix | Delete

* @return string

[454] Fix | Delete

*/

[455] Fix | Delete

public static function applicationIDLookup($applicationid) {

[456] Fix | Delete

// http://flac.sourceforge.net/id.html

[457] Fix | Delete

static $lookup = array(

[458] Fix | Delete

0x41544348 => 'FlacFile', // "ATCH"

[459] Fix | Delete

0x42534F4C => 'beSolo', // "BSOL"

[460] Fix | Delete

0x42554753 => 'Bugs Player', // "BUGS"

[461] Fix | Delete

0x43756573 => 'GoldWave cue points (specification)', // "Cues"

[462] Fix | Delete

0x46696361 => 'CUE Splitter', // "Fica"

[463] Fix | Delete

0x46746F6C => 'flac-tools', // "Ftol"

[464] Fix | Delete

0x4D4F5442 => 'MOTB MetaCzar', // "MOTB"

[465] Fix | Delete

0x4D505345 => 'MP3 Stream Editor', // "MPSE"

[466] Fix | Delete

0x4D754D4C => 'MusicML: Music Metadata Language', // "MuML"

[467] Fix | Delete

0x52494646 => 'Sound Devices RIFF chunk storage', // "RIFF"

[468] Fix | Delete

0x5346464C => 'Sound Font FLAC', // "SFFL"

[469] Fix | Delete

0x534F4E59 => 'Sony Creative Software', // "SONY"

[470] Fix | Delete

0x5351455A => 'flacsqueeze', // "SQEZ"

[471] Fix | Delete

0x54745776 => 'TwistedWave', // "TtWv"

[472] Fix | Delete

0x55495453 => 'UITS Embedding tools', // "UITS"

[473] Fix | Delete

0x61696666 => 'FLAC AIFF chunk storage', // "aiff"

[474] Fix | Delete

0x696D6167 => 'flac-image application for storing arbitrary files in APPLICATION metadata blocks', // "imag"

[475] Fix | Delete

0x7065656D => 'Parseable Embedded Extensible Metadata (specification)', // "peem"

[476] Fix | Delete

0x71667374 => 'QFLAC Studio', // "qfst"

[477] Fix | Delete

0x72696666 => 'FLAC RIFF chunk storage', // "riff"

[478] Fix | Delete

0x74756E65 => 'TagTuner', // "tune"

[479] Fix | Delete

0x78626174 => 'XBAT', // "xbat"

[480] Fix | Delete

0x786D6364 => 'xmcd', // "xmcd"

[481] Fix | Delete

);

[482] Fix | Delete

return (isset($lookup[$applicationid]) ? $lookup[$applicationid] : 'reserved');

[483] Fix | Delete

}

[484] Fix | Delete

[485] Fix | Delete

/**

[486] Fix | Delete

* @param int $type_id

[487] Fix | Delete

*

[488] Fix | Delete

* @return string

[489] Fix | Delete

*/

[490] Fix | Delete

public static function pictureTypeLookup($type_id) {

[491] Fix | Delete

static $lookup = array (

[492] Fix | Delete

0 => 'Other',

[493] Fix | Delete

1 => '32x32 pixels \'file icon\' (PNG only)',

[494] Fix | Delete

2 => 'Other file icon',

[495] Fix | Delete

3 => 'Cover (front)',

[496] Fix | Delete

4 => 'Cover (back)',

[497] Fix | Delete

5 => 'Leaflet page',

[498] Fix | Delete

6 => 'Media (e.g. label side of CD)',

[499] Fix | Delete