getid3.php

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							'pattern'   => '^SZ\x0A\x04',
							'group'     => 'archive',
							'module'    => 'szip',
							'mime_type' => 'application/octet-stream',
							'fail_id3'  => 'ERROR',
							'fail_ape'  => 'ERROR',
						  ),

				// ZIP  - data        - ZIP compressed data
				'zip'  => array(
							'pattern'   => '^PK\x03\x04',
							'group'     => 'archive',
							'module'    => 'zip',
							'mime_type' => 'application/zip',
							'fail_id3'  => 'ERROR',
							'fail_ape'  => 'ERROR',
						  )
			);
		}

		return $format_info;
	}



	function GetFileFormat(&$filedata, $filename='') {
		// this function will determine the format of a file based on usually
		// the first 2-4 bytes of the file (8 bytes for PNG, 16 bytes for JPG,
		// and in the case of ISO CD image, 6 bytes offset 32kb from the start
		// of the file).

		// Identify file format - loop through $format_info and detect with reg expr
		foreach ($this->GetFileFormatArray() as $format_name => $info) {
			// Using preg_match() instead of ereg() - much faster
			// The /s switch on preg_match() forces preg_match() NOT to treat
			// newline (0x0A) characters as special chars but do a binary match
			if (preg_match('/'.$info['pattern'].'/s', $filedata)) {
				$info['include'] = 'module.'.$info['group'].'.'.$info['module'].'.php';
				return $info;
			}
		}

		// Too many mp3 encoders on the market put gabage in front of mpeg files
		// use assume format on these if format detection failed
		if (preg_match('/\.mp[123a]$/i', $filename)) {
			$GetFileFormatArray = $this->GetFileFormatArray();
			$info = $GetFileFormatArray['mp3'];
			$info['include'] = 'module.'.$info['group'].'.'.$info['module'].'.php';
			return $info;
		}

		return false;
	}


	// converts array to $encoding charset from $this->encoding
	function CharConvert(&$array, $encoding) {

		// identical encoding - end here
		if ($encoding == $this->encoding) {
			return;
		}

		// loop thru array
		foreach ($array as $key => $value) {

			// go recursive
			if (is_array($value)) {
				$this->CharConvert($array[$key], $encoding);
			}

			// convert string
			elseif (is_string($value)) {
				$array[$key] = trim(getid3_lib::iconv_fallback($encoding, $this->encoding, $value));
			}
		}
	}


	function HandleAllTags() {

		// key name => array (tag name, character encoding)
		static $tags;
		if (empty($tags)) {
			$tags = array(
				'asf'       => array('asf'           , 'UTF-16LE'),
				'midi'      => array('midi'          , 'ISO-8859-1'),
				'nsv'       => array('nsv'           , 'ISO-8859-1'),
				'ogg'       => array('vorbiscomment' , 'UTF-8'),
				'png'       => array('png'           , 'UTF-8'),
				'tiff'      => array('tiff'          , 'ISO-8859-1'),
				'quicktime' => array('quicktime'     , 'ISO-8859-1'),
				'real'      => array('real'          , 'ISO-8859-1'),
				'vqf'       => array('vqf'           , 'ISO-8859-1'),
				'zip'       => array('zip'           , 'ISO-8859-1'),
				'riff'      => array('riff'          , 'ISO-8859-1'),
				'lyrics3'   => array('lyrics3'       , 'ISO-8859-1'),
				'id3v1'     => array('id3v1'         , $this->encoding_id3v1),
				'id3v2'     => array('id3v2'         , 'UTF-8'), // not according to the specs (every frame can have a different encoding), but getID3() force-converts all encodings to UTF-8
				'ape'       => array('ape'           , 'UTF-8')
			);
		}

		// loop thru comments array
		foreach ($tags as $comment_name => $tagname_encoding_array) {
			list($tag_name, $encoding) = $tagname_encoding_array;

			// fill in default encoding type if not already present
			if (isset($this->info[$comment_name]) && !isset($this->info[$comment_name]['encoding'])) {
				$this->info[$comment_name]['encoding'] = $encoding;
			}

			// copy comments if key name set
			if (!empty($this->info[$comment_name]['comments'])) {

				foreach ($this->info[$comment_name]['comments'] as $tag_key => $valuearray) {
					foreach ($valuearray as $key => $value) {
						if (strlen(trim($value)) > 0) {
							$this->info['tags'][trim($tag_name)][trim($tag_key)][] = $value; // do not trim!! Unicode characters will get mangled if trailing nulls are removed!
						}
					}
				}

				if (!isset($this->info['tags'][$tag_name])) {
					// comments are set but contain nothing but empty strings, so skip
					continue;
				}

				if ($this->option_tags_html) {
					foreach ($this->info['tags'][$tag_name] as $tag_key => $valuearray) {
						foreach ($valuearray as $key => $value) {
							if (is_string($value)) {
								//$this->info['tags_html'][$tag_name][$tag_key][$key] = getid3_lib::MultiByteCharString2HTML($value, $encoding);
								$this->info['tags_html'][$tag_name][$tag_key][$key] = str_replace('�', '', getid3_lib::MultiByteCharString2HTML($value, $encoding));
							} else {
								$this->info['tags_html'][$tag_name][$tag_key][$key] = $value;
							}
						}
					}
				}

				$this->CharConvert($this->info['tags'][$tag_name], $encoding);           // only copy gets converted!
			}

		}
		return true;
	}


	function getHashdata($algorithm) {
		switch ($algorithm) {
			case 'md5':
			case 'sha1':
				break;

			default:
				return $this->error('bad algorithm "'.$algorithm.'" in getHashdata()');
				break;
		}

		if ((@$this->info['fileformat'] == 'ogg') && (@$this->info['audio']['dataformat'] == 'vorbis')) {

			// We cannot get an identical md5_data value for Ogg files where the comments
			// span more than 1 Ogg page (compared to the same audio data with smaller
			// comments) using the normal getID3() method of MD5'ing the data between the
			// end of the comments and the end of the file (minus any trailing tags),
			// because the page sequence numbers of the pages that the audio data is on
			// do not match. Under normal circumstances, where comments are smaller than
			// the nominal 4-8kB page size, then this is not a problem, but if there are
			// very large comments, the only way around it is to strip off the comment
			// tags with vorbiscomment and MD5 that file.
			// This procedure must be applied to ALL Ogg files, not just the ones with
			// comments larger than 1 page, because the below method simply MD5's the
			// whole file with the comments stripped, not just the portion after the
			// comments block (which is the standard getID3() method.

			// The above-mentioned problem of comments spanning multiple pages and changing
			// page sequence numbers likely happens for OggSpeex and OggFLAC as well, but
			// currently vorbiscomment only works on OggVorbis files.

			if ((bool) ini_get('safe_mode')) {

				$this->info['warning'][] = 'Failed making system call to vorbiscomment.exe - '.$algorithm.'_data is incorrect - error returned: PHP running in Safe Mode (backtick operator not available)';
				$this->info[$algorithm.'_data']  = false;

			} else {

				// Prevent user from aborting script
				$old_abort = ignore_user_abort(true);

				// Create empty file
				$empty = tempnam('*', 'getID3');
				touch($empty);


				// Use vorbiscomment to make temp file without comments
				$temp = tempnam('*', 'getID3');
				$file = $this->info['filenamepath'];

				if (GETID3_OS_ISWINDOWS) {

					if (file_exists(GETID3_HELPERAPPSDIR.'vorbiscomment.exe')) {

						$commandline = '"'.GETID3_HELPERAPPSDIR.'vorbiscomment.exe" -w -c "'.$empty.'" "'.$file.'" "'.$temp.'"';
						$VorbisCommentError = `$commandline`;

					} else {

						$VorbisCommentError = 'vorbiscomment.exe not found in '.GETID3_HELPERAPPSDIR;

					}

				} else {

					$commandline = 'vorbiscomment -w -c "'.$empty.'" "'.$file.'" "'.$temp.'" 2>&1';
					$VorbisCommentError = `$commandline`;

				}

				if (!empty($VorbisCommentError)) {

					$this->info['warning'][]         = 'Failed making system call to vorbiscomment(.exe) - '.$algorithm.'_data will be incorrect. If vorbiscomment is unavailable, please download from http://www.vorbis.com/download.psp and put in the getID3() directory. Error returned: '.$VorbisCommentError;
					$this->info[$algorithm.'_data']  = false;

				} else {

					// Get hash of newly created file
					switch ($algorithm) {
						case 'md5':
							$this->info[$algorithm.'_data'] = getid3_lib::md5_file($temp);
							break;

						case 'sha1':
							$this->info[$algorithm.'_data'] = getid3_lib::sha1_file($temp);
							break;
					}
				}

				// Clean up
				unlink($empty);
				unlink($temp);

				// Reset abort setting
				ignore_user_abort($old_abort);

			}

		} else {

			if (!empty($this->info['avdataoffset']) || (isset($this->info['avdataend']) && ($this->info['avdataend'] < $this->info['filesize']))) {

				// get hash from part of file
				$this->info[$algorithm.'_data'] = getid3_lib::hash_data($this->info['filenamepath'], $this->info['avdataoffset'], $this->info['avdataend'], $algorithm);

			} else {

				// get hash from whole file
				switch ($algorithm) {
					case 'md5':
						$this->info[$algorithm.'_data'] = getid3_lib::md5_file($this->info['filenamepath']);
						break;

					case 'sha1':
						$this->info[$algorithm.'_data'] = getid3_lib::sha1_file($this->info['filenamepath']);
						break;
				}
			}

		}
		return true;
	}


	function ChannelsBitratePlaytimeCalculations() {

		// set channelmode on audio
		if (@$this->info['audio']['channels'] == '1') {
			$this->info['audio']['channelmode'] = 'mono';
		} elseif (@$this->info['audio']['channels'] == '2') {
			$this->info['audio']['channelmode'] = 'stereo';
		}

		// Calculate combined bitrate - audio + video
		$CombinedBitrate  = 0;
		$CombinedBitrate += (isset($this->info['audio']['bitrate']) ? $this->info['audio']['bitrate'] : 0);
		$CombinedBitrate += (isset($this->info['video']['bitrate']) ? $this->info['video']['bitrate'] : 0);
		if (($CombinedBitrate > 0) && empty($this->info['bitrate'])) {
			$this->info['bitrate'] = $CombinedBitrate;
		}
		//if ((isset($this->info['video']) && !isset($this->info['video']['bitrate'])) || (isset($this->info['audio']) && !isset($this->info['audio']['bitrate']))) {
		//	// for example, VBR MPEG video files cannot determine video bitrate:
		//	// should not set overall bitrate and playtime from audio bitrate only
		//	unset($this->info['bitrate']);
		//}

		if (!isset($this->info['playtime_seconds']) && !empty($this->info['bitrate'])) {
			$this->info['playtime_seconds'] = (($this->info['avdataend'] - $this->info['avdataoffset']) * 8) / $this->info['bitrate'];
		}

		// Set playtime string
		if (!empty($this->info['playtime_seconds']) && empty($this->info['playtime_string'])) {
			$this->info['playtime_string'] = getid3_lib::PlaytimeString($this->info['playtime_seconds']);
		}
	}


	function CalculateCompressionRatioVideo() {
		if (empty($this->info['video'])) {
			return false;
		}
		if (empty($this->info['video']['resolution_x']) || empty($this->info['video']['resolution_y'])) {
			return false;
		}
		if (empty($this->info['video']['bits_per_sample'])) {
			return false;
		}

		switch ($this->info['video']['dataformat']) {
			case 'bmp':
			case 'gif':
			case 'jpeg':
			case 'jpg':
			case 'png':
			case 'tiff':
				$FrameRate = 1;
				$PlaytimeSeconds = 1;
				$BitrateCompressed = $this->info['filesize'] * 8;
				break;

			default:
				if (!empty($this->info['video']['frame_rate'])) {
					$FrameRate = $this->info['video']['frame_rate'];
				} else {
					return false;
				}
				if (!empty($this->info['playtime_seconds'])) {
					$PlaytimeSeconds = $this->info['playtime_seconds'];
				} else {
					return false;
				}
				if (!empty($this->info['video']['bitrate'])) {
					$BitrateCompressed = $this->info['video']['bitrate'];
				} else {
					return false;
				}
				break;
		}
		$BitrateUncompressed = $this->info['video']['resolution_x'] * $this->info['video']['resolution_y'] * $this->info['video']['bits_per_sample'] * $FrameRate;

		$this->info['video']['compression_ratio'] = $BitrateCompressed / $BitrateUncompressed;
		return true;
	}


	function CalculateCompressionRatioAudio() {
		if (empty($this->info['audio']['bitrate']) || empty($this->info['audio']['channels']) || empty($this->info['audio']['sample_rate'])) {
			return false;
		}
		$this->info['audio']['compression_ratio'] = $this->info['audio']['bitrate'] / ($this->info['audio']['channels'] * $this->info['audio']['sample_rate'] * (!empty($this->info['audio']['bits_per_sample']) ? $this->info['audio']['bits_per_sample'] : 16));

		if (!empty($this->info['audio']['streams'])) {
			foreach ($this->info['audio']['streams'] as $streamnumber => $streamdata) {
				if (!empty($streamdata['bitrate']) && !empty($streamdata['channels']) && !empty($streamdata['sample_rate'])) {
					$this->info['audio']['streams'][$streamnumber]['compression_ratio'] = $streamdata['bitrate'] / ($streamdata['channels'] * $streamdata['sample_rate'] * (!empty($streamdata['bits_per_sample']) ? $streamdata['bits_per_sample'] : 16));
				}
			}
		}
		return true;
	}


	function CalculateReplayGain() {
		if (isset($this->info['replay_gain'])) {
			$this->info['replay_gain']['reference_volume'] = 89;
			if (isset($this->info['replay_gain']['track']['adjustment'])) {
				$this->info['replay_gain']['track']['volume'] = $this->info['replay_gain']['reference_volume'] - $this->info['replay_gain']['track']['adjustment'];
			}
			if (isset($this->info['replay_gain']['album']['adjustment'])) {
				$this->info['replay_gain']['album']['volume'] = $this->info['replay_gain']['reference_volume'] - $this->info['replay_gain']['album']['adjustment'];
			}

			if (isset($this->info['replay_gain']['track']['peak'])) {
				$this->info['replay_gain']['track']['max_noclip_gain'] = 0 - getid3_lib::RGADamplitude2dB($this->info['replay_gain']['track']['peak']);
			}
			if (isset($this->info['replay_gain']['album']['peak'])) {
				$this->info['replay_gain']['album']['max_noclip_gain'] = 0 - getid3_lib::RGADamplitude2dB($this->info['replay_gain']['album']['peak']);
			}
		}
		return true;
	}

	function ProcessAudioStreams() {
		if (!empty($this->info['audio']['bitrate']) || !empty($this->info['audio']['channels']) || !empty($this->info['audio']['sample_rate'])) {
			if (!isset($this->info['audio']['streams'])) {
				foreach ($this->info['audio'] as $key => $value) {
					if ($key != 'streams') {
						$this->info['audio']['streams'][0][$key] = $value;
					}
				}
			}
		}
		return true;
	}

}

?>