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File Content: `module.audio.flac.php`

<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at https://github.com/JamesHeinrich/getID3       //
//            or https://www.getid3.org                        //
//            or http://getid3.sourceforge.net                 //
//  see readme.txt for more details                            //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.audio.flac.php                                       //
// module for analyzing FLAC and OggFLAC audio files           //
// dependencies: module.audio.ogg.php                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}
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';

	/**
	 * @return bool
	 */
	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();
	}

	/**
	 * @return bool
	 */
	public function parseMETAdata() {
		$info = &$this->getid3->info;
		do {
			$BlockOffset   = $this->ftell();
			$BlockHeader   = $this->fread(4);
			$LBFBT         = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));  // LBFBT = LastBlockFlag + BlockType
			$LastBlockFlag = (bool) ($LBFBT & 0x80);
			$BlockType     =        ($LBFBT & 0x7F);
			$BlockLength   = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));
			$BlockTypeText = self::metaBlockTypeLookup($BlockType);

			if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) {
				$this->warning('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file');
				break;
			}
			if ($BlockLength < 1) {
				if ($BlockTypeText != 'reserved') {
					// probably supposed to be zero-length
					$this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockTypeText.') at offset '.$BlockOffset.' is zero bytes');
					continue;
				}
				$this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$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'])) {
					if (!isset($info['flac']['comments']['picture'])) {
						$info['flac']['comments']['picture'] = array();
					}
					$comments_picture_data = array();
					foreach (array('data', 'image_mime', 'image_width', 'image_height', 'imagetype', 'picturetype', 'description', 'datalength') as $picture_key) {
						if (isset($entry[$picture_key])) {
							$comments_picture_data[$picture_key] = $entry[$picture_key];
						}
					}
					$info['flac']['comments']['picture'][] = $comments_picture_data;
					unset($comments_picture_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;
	}


	/**
	 * @param string $BlockData
	 *
	 * @return array
	 */
	public static function parseSTREAMINFOdata($BlockData) {
		$streaminfo = array();
		$streaminfo['min_block_size']  = getid3_lib::BigEndian2Int(substr($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);

		return $streaminfo;
	}

	/**
	 * @param string $BlockData
	 *
	 * @return bool
	 */
	private function parseSTREAMINFO($BlockData) {
		$info = &$this->getid3->info;

		$info['flac']['STREAMINFO'] = self::parseSTREAMINFOdata($BlockData);

		if (!empty($info['flac']['STREAMINFO']['sample_rate'])) {

			$info['audio']['bitrate_mode']    = 'vbr';
			$info['audio']['sample_rate']     = $info['flac']['STREAMINFO']['sample_rate'];
			$info['audio']['channels']        = $info['flac']['STREAMINFO']['channels'];
			$info['audio']['bits_per_sample'] = $info['flac']['STREAMINFO']['bits_per_sample'];
			$info['playtime_seconds']         = $info['flac']['STREAMINFO']['samples_stream'] / $info['flac']['STREAMINFO']['sample_rate'];
			if ($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;
	}

	/**
	 * @param string $BlockData
	 *
	 * @return bool
	 */
	private function parseAPPLICATION($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;
	}

	/**
	 * @param string $BlockData
	 *
	 * @return bool
	 */
	private function parseSEEKTABLE($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;
	}

	/**
	 * @param string $BlockData
	 *
	 * @return bool
	 */
	private function parseVORBIS_COMMENT($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;
	}

	/**
	 * @param string $BlockData
	 *
	 * @return bool
	 */
	private function parseCUESHEET($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
	 *
	 * @return bool
	 */
	public function parsePICTURE() {
		$info = &$this->getid3->info;

		$picture = array();
		$picture['typeid']         = getid3_lib::BigEndian2Int($this->fread(4));
		$picture['picturetype']    = self::pictureTypeLookup($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);
		}
		$picture['image_width']    = getid3_lib::BigEndian2Int($this->fread(4));
		$picture['image_height']   = getid3_lib::BigEndian2Int($this->fread(4));
		$picture['color_depth']    = getid3_lib::BigEndian2Int($this->fread(4));
		$picture['colors_indexed'] = getid3_lib::BigEndian2Int($this->fread(4));
		$picture['datalength']     = getid3_lib::BigEndian2Int($this->fread(4));

		if ($picture['image_mime'] == '-->') {
			$picture['data'] = $this->fread($picture['datalength']);
		} else {
			$picture['data'] = $this->saveAttachment(
				str_replace('/', '_', $picture['picturetype']).'_'.$this->ftell(),
				$this->ftell(),
				$picture['datalength'],
				$picture['image_mime']);
		}

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

		return true;
	}

	/**
	 * @param int $blocktype
	 *
	 * @return string
	 */
	public static function metaBlockTypeLookup($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');
	}

	/**
	 * @param int $applicationid
	 *
	 * @return string
	 */
	public static function applicationIDLookup($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');
	}

	/**
	 * @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');
	}

}
Name	Size	Permission
.htaccess	148 bytes	0444
getid3.lib.php	54806 bytes	0644
getid3.php	80473 bytes	0644
license.commercial.txt	1307 bytes	0644
license.txt	1361 bytes	0644
module.audio-video.asf.php	135836 bytes	0644
module.audio-video.flv.php	27132 bytes	0644
module.audio-video.matroska.php	107141 bytes	0644
module.audio-video.quicktime.php	160983 bytes	0644
module.audio-video.riff.php	138799 bytes	0644
module.audio.ac3.php	39384 bytes	0644
module.audio.dts.php	10886 bytes	0644
module.audio.flac.php	19691 bytes	0644
module.audio.mp3.php	107194 bytes	0644
module.audio.ogg.php	43258 bytes	0644
module.tag.apetag.php	18881 bytes	0644
module.tag.id3v1.php	15082 bytes	0644
module.tag.id3v2.php	154893 bytes	0644
module.tag.lyrics3.php	11807 bytes	0644
readme.txt	26295 bytes	0644
File Content: module.audio.flac.php

File Content: `module.audio.flac.php`
