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sources/3rdparty/getid3/module.audio.ogg.php 29.9 KB
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  <?php
  /////////////////////////////////////////////////////////////////
  /// getID3() by James Heinrich <info@getid3.org>               //
  //  available at http://getid3.sourceforge.net                 //
  //            or http://www.getid3.org                         //
  /////////////////////////////////////////////////////////////////
  // See readme.txt for more details                             //
  /////////////////////////////////////////////////////////////////
  //                                                             //
  // module.audio.ogg.php                                        //
  // module for analyzing Ogg Vorbis, OggFLAC and Speex files    //
  // dependencies: module.audio.flac.php                         //
  //                                                            ///
  /////////////////////////////////////////////////////////////////
  
  getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.audio.flac.php', __FILE__, true);
  
  class getid3_ogg extends getid3_handler
  {
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  	// http://xiph.org/vorbis/doc/Vorbis_I_spec.html
  	public function Analyze() {
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  		$info = &$this->getid3->info;
  
  		$info['fileformat'] = 'ogg';
  
  		// Warn about illegal tags - only vorbiscomments are allowed
  		if (isset($info['id3v2'])) {
  			$info['warning'][] = 'Illegal ID3v2 tag present.';
  		}
  		if (isset($info['id3v1'])) {
  			$info['warning'][] = 'Illegal ID3v1 tag present.';
  		}
  		if (isset($info['ape'])) {
  			$info['warning'][] = 'Illegal APE tag present.';
  		}
  
  
  		// Page 1 - Stream Header
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  		$this->fseek($info['avdataoffset']);
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  		$oggpageinfo = $this->ParseOggPageHeader();
  		$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
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  		if ($this->ftell() >= $this->getid3->fread_buffer_size()) {
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  			$info['error'][] = 'Could not find start of Ogg page in the first '.$this->getid3->fread_buffer_size().' bytes (this might not be an Ogg-Vorbis file?)';
  			unset($info['fileformat']);
  			unset($info['ogg']);
  			return false;
  		}
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  		$filedata = $this->fread($oggpageinfo['page_length']);
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  		$filedataoffset = 0;
  
  		if (substr($filedata, 0, 4) == 'fLaC') {
  
  			$info['audio']['dataformat']   = 'flac';
  			$info['audio']['bitrate_mode'] = 'vbr';
  			$info['audio']['lossless']     = true;
  
  		} elseif (substr($filedata, 1, 6) == 'vorbis') {
  
  			$this->ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);
  
  		} elseif (substr($filedata, 0, 8) == 'Speex   ') {
  
  			// http://www.speex.org/manual/node10.html
  
  			$info['audio']['dataformat']   = 'speex';
  			$info['mime_type']             = 'audio/speex';
  			$info['audio']['bitrate_mode'] = 'abr';
  			$info['audio']['lossless']     = false;
  
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_string']           =                              substr($filedata, $filedataoffset, 8); // hard-coded to 'Speex   '
  			$filedataoffset += 8;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']          =                              substr($filedata, $filedataoffset, 20);
  			$filedataoffset += 20;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version_id']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['header_size']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode_bitstream_version'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['bitrate']                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['framesize']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr']                    = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['frames_per_packet']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['extra_headers']          = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved1']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  			$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['reserved2']              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  			$filedataoffset += 4;
  
  			$info['speex']['speex_version'] = trim($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['speex_version']);
  			$info['speex']['sample_rate']   = $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['rate'];
  			$info['speex']['channels']      = $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['nb_channels'];
  			$info['speex']['vbr']           = (bool) $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['vbr'];
  			$info['speex']['band_type']     = $this->SpeexBandModeLookup($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['mode']);
  
  			$info['audio']['sample_rate']   = $info['speex']['sample_rate'];
  			$info['audio']['channels']      = $info['speex']['channels'];
  			if ($info['speex']['vbr']) {
  				$info['audio']['bitrate_mode'] = 'vbr';
  			}
  
  
  		} elseif (substr($filedata, 0, 8) == "fishead\x00") {
  
  			// Ogg Skeleton version 3.0 Format Specification
  			// http://xiph.org/ogg/doc/skeleton.html
  			$filedataoffset += 8;
  			$info['ogg']['skeleton']['fishead']['raw']['version_major']                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
  			$filedataoffset += 2;
  			$info['ogg']['skeleton']['fishead']['raw']['version_minor']                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
  			$filedataoffset += 2;
  			$info['ogg']['skeleton']['fishead']['raw']['presentationtime_numerator']   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  			$filedataoffset += 8;
  			$info['ogg']['skeleton']['fishead']['raw']['presentationtime_denominator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  			$filedataoffset += 8;
  			$info['ogg']['skeleton']['fishead']['raw']['basetime_numerator']           = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  			$filedataoffset += 8;
  			$info['ogg']['skeleton']['fishead']['raw']['basetime_denominator']         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  			$filedataoffset += 8;
  			$info['ogg']['skeleton']['fishead']['raw']['utc']                          = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 20));
  			$filedataoffset += 20;
  
  			$info['ogg']['skeleton']['fishead']['version']          = $info['ogg']['skeleton']['fishead']['raw']['version_major'].'.'.$info['ogg']['skeleton']['fishead']['raw']['version_minor'];
  			$info['ogg']['skeleton']['fishead']['presentationtime'] = $info['ogg']['skeleton']['fishead']['raw']['presentationtime_numerator'] / $info['ogg']['skeleton']['fishead']['raw']['presentationtime_denominator'];
  			$info['ogg']['skeleton']['fishead']['basetime']         = $info['ogg']['skeleton']['fishead']['raw']['basetime_numerator']         / $info['ogg']['skeleton']['fishead']['raw']['basetime_denominator'];
  			$info['ogg']['skeleton']['fishead']['utc']              = $info['ogg']['skeleton']['fishead']['raw']['utc'];
  
  
  			$counter = 0;
  			do {
  				$oggpageinfo = $this->ParseOggPageHeader();
  				$info['ogg']['pageheader'][$oggpageinfo['page_seqno'].'.'.$counter++] = $oggpageinfo;
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  				$filedata = $this->fread($oggpageinfo['page_length']);
  				$this->fseek($oggpageinfo['page_end_offset']);
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  				if (substr($filedata, 0, 8) == "fisbone\x00") {
  
  					$filedataoffset = 8;
  					$info['ogg']['skeleton']['fisbone']['raw']['message_header_offset']   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
  					$filedataoffset += 4;
  					$info['ogg']['skeleton']['fisbone']['raw']['serial_number']           = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
  					$filedataoffset += 4;
  					$info['ogg']['skeleton']['fisbone']['raw']['number_header_packets']   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
  					$filedataoffset += 4;
  					$info['ogg']['skeleton']['fisbone']['raw']['granulerate_numerator']   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  					$filedataoffset += 8;
  					$info['ogg']['skeleton']['fisbone']['raw']['granulerate_denominator'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  					$filedataoffset += 8;
  					$info['ogg']['skeleton']['fisbone']['raw']['basegranule']             = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
  					$filedataoffset += 8;
  					$info['ogg']['skeleton']['fisbone']['raw']['preroll']                 = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
  					$filedataoffset += 4;
  					$info['ogg']['skeleton']['fisbone']['raw']['granuleshift']            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  1));
  					$filedataoffset += 1;
  					$info['ogg']['skeleton']['fisbone']['raw']['padding']                 =                              substr($filedata, $filedataoffset,  3);
  					$filedataoffset += 3;
  
  				} elseif (substr($filedata, 1, 6) == 'theora') {
  
  					$info['video']['dataformat'] = 'theora';
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  					$info['error'][] = 'Ogg Theora not correctly handled in this version of getID3 ['.$this->getid3->version().']';
  					//break;
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  				} elseif (substr($filedata, 1, 6) == 'vorbis') {
  
  					$this->ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);
  
  				} else {
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  					$info['error'][] = 'unexpected';
  					//break;
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  				}
  			//} while ($oggpageinfo['page_seqno'] == 0);
  			} while (($oggpageinfo['page_seqno'] == 0) && (substr($filedata, 0, 8) != "fisbone\x00"));
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  			$this->fseek($oggpageinfo['page_start_offset']);









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  			$info['error'][] = 'Ogg Skeleton not correctly handled in this version of getID3 ['.$this->getid3->version().']';
  			//return false;









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  		} else {
  
  			$info['error'][] = 'Expecting either "Speex   " or "vorbis" identifier strings, found "'.substr($filedata, 0, 8).'"';
  			unset($info['ogg']);
  			unset($info['mime_type']);
  			return false;
  
  		}
  
  		// Page 2 - Comment Header
  		$oggpageinfo = $this->ParseOggPageHeader();
  		$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
  
  		switch ($info['audio']['dataformat']) {
  			case 'vorbis':









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  				$filedata = $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);









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  				$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, 0, 1));
  				$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] =                              substr($filedata, 1, 6); // hard-coded to 'vorbis'









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  				$this->ParseVorbisComments();









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  				break;
  
  			case 'flac':









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  				$flac = new getid3_flac($this->getid3);
  				if (!$flac->parseMETAdata()) {









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  					$info['error'][] = 'Failed to parse FLAC headers';
  					return false;
  				}









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  				unset($flac);









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  				break;
  
  			case 'speex':









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  				$this->fseek($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length'], SEEK_CUR);
  				$this->ParseVorbisComments();









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  				break;









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  		}









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  		// Last Page - Number of Samples









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  		if (!getid3_lib::intValueSupported($info['avdataend'])) {
  
  			$info['warning'][] = 'Unable to parse Ogg end chunk file (PHP does not support file operations beyond '.round(PHP_INT_MAX / 1073741824).'GB)';
  
  		} else {









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  			$this->fseek(max($info['avdataend'] - $this->getid3->fread_buffer_size(), 0));
  			$LastChunkOfOgg = strrev($this->fread($this->getid3->fread_buffer_size()));









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  			if ($LastOggSpostion = strpos($LastChunkOfOgg, 'SggO')) {









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  				$this->fseek($info['avdataend'] - ($LastOggSpostion + strlen('SggO')));
  				$info['avdataend'] = $this->ftell();









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  				$info['ogg']['pageheader']['eos'] = $this->ParseOggPageHeader();
  				$info['ogg']['samples']   = $info['ogg']['pageheader']['eos']['pcm_abs_position'];
  				if ($info['ogg']['samples'] == 0) {
  					$info['error'][] = 'Corrupt Ogg file: eos.number of samples == zero';
  					return false;
  				}
  				if (!empty($info['audio']['sample_rate'])) {
  					$info['ogg']['bitrate_average'] = (($info['avdataend'] - $info['avdataoffset']) * 8) / ($info['ogg']['samples'] / $info['audio']['sample_rate']);
  				}
  			}
  
  		}
  
  		if (!empty($info['ogg']['bitrate_average'])) {
  			$info['audio']['bitrate'] = $info['ogg']['bitrate_average'];
  		} elseif (!empty($info['ogg']['bitrate_nominal'])) {
  			$info['audio']['bitrate'] = $info['ogg']['bitrate_nominal'];
  		} elseif (!empty($info['ogg']['bitrate_min']) && !empty($info['ogg']['bitrate_max'])) {
  			$info['audio']['bitrate'] = ($info['ogg']['bitrate_min'] + $info['ogg']['bitrate_max']) / 2;
  		}
  		if (isset($info['audio']['bitrate']) && !isset($info['playtime_seconds'])) {
  			if ($info['audio']['bitrate'] == 0) {
  				$info['error'][] = 'Corrupt Ogg file: bitrate_audio == zero';
  				return false;
  			}
  			$info['playtime_seconds'] = (float) ((($info['avdataend'] - $info['avdataoffset']) * 8) / $info['audio']['bitrate']);
  		}
  
  		if (isset($info['ogg']['vendor'])) {
  			$info['audio']['encoder'] = preg_replace('/^Encoded with /', '', $info['ogg']['vendor']);
  
  			// Vorbis only
  			if ($info['audio']['dataformat'] == 'vorbis') {
  
  				// Vorbis 1.0 starts with Xiph.Org
  				if  (preg_match('/^Xiph.Org/', $info['audio']['encoder'])) {
  
  					if ($info['audio']['bitrate_mode'] == 'abr') {
  
  						// Set -b 128 on abr files
  						$info['audio']['encoder_options'] = '-b '.round($info['ogg']['bitrate_nominal'] / 1000);
  
  					} elseif (($info['audio']['bitrate_mode'] == 'vbr') && ($info['audio']['channels'] == 2) && ($info['audio']['sample_rate'] >= 44100) && ($info['audio']['sample_rate'] <= 48000)) {
  						// Set -q N on vbr files
  						$info['audio']['encoder_options'] = '-q '.$this->get_quality_from_nominal_bitrate($info['ogg']['bitrate_nominal']);
  
  					}
  				}
  
  				if (empty($info['audio']['encoder_options']) && !empty($info['ogg']['bitrate_nominal'])) {
  					$info['audio']['encoder_options'] = 'Nominal bitrate: '.intval(round($info['ogg']['bitrate_nominal'] / 1000)).'kbps';
  				}
  			}
  		}
  
  		return true;
  	}









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  	public function ParseVorbisPageHeader(&$filedata, &$filedataoffset, &$oggpageinfo) {









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  		$info = &$this->getid3->info;
  		$info['audio']['dataformat'] = 'vorbis';
  		$info['audio']['lossless']   = false;
  
  		$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['packet_type'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  		$filedataoffset += 1;
  		$info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['stream_type'] = substr($filedata, $filedataoffset, 6); // hard-coded to 'vorbis'
  		$filedataoffset += 6;
  		$info['ogg']['bitstreamversion'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$info['ogg']['numberofchannels'] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  		$filedataoffset += 1;
  		$info['audio']['channels']       = $info['ogg']['numberofchannels'];
  		$info['ogg']['samplerate']       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		if ($info['ogg']['samplerate'] == 0) {
  			$info['error'][] = 'Corrupt Ogg file: sample rate == zero';
  			return false;
  		}
  		$info['audio']['sample_rate']    = $info['ogg']['samplerate'];
  		$info['ogg']['samples']          = 0; // filled in later
  		$info['ogg']['bitrate_average']  = 0; // filled in later
  		$info['ogg']['bitrate_max']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$info['ogg']['bitrate_nominal']  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$info['ogg']['bitrate_min']      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$info['ogg']['blocksize_small']  = pow(2,  getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0x0F);
  		$info['ogg']['blocksize_large']  = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) & 0xF0) >> 4);
  		$info['ogg']['stop_bit']         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet
  
  		$info['audio']['bitrate_mode'] = 'vbr'; // overridden if actually abr
  		if ($info['ogg']['bitrate_max'] == 0xFFFFFFFF) {
  			unset($info['ogg']['bitrate_max']);
  			$info['audio']['bitrate_mode'] = 'abr';
  		}
  		if ($info['ogg']['bitrate_nominal'] == 0xFFFFFFFF) {
  			unset($info['ogg']['bitrate_nominal']);
  		}
  		if ($info['ogg']['bitrate_min'] == 0xFFFFFFFF) {
  			unset($info['ogg']['bitrate_min']);
  			$info['audio']['bitrate_mode'] = 'abr';
  		}
  		return true;
  	}









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  	public function ParseOggPageHeader() {









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  		// http://xiph.org/ogg/vorbis/doc/framing.html









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  		$oggheader['page_start_offset'] = $this->ftell(); // where we started from in the file









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  		$filedata = $this->fread($this->getid3->fread_buffer_size());









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  		$filedataoffset = 0;
  		while ((substr($filedata, $filedataoffset++, 4) != 'OggS')) {









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  			if (($this->ftell() - $oggheader['page_start_offset']) >= $this->getid3->fread_buffer_size()) {









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  				// should be found before here
  				return false;
  			}
  			if ((($filedataoffset + 28) > strlen($filedata)) || (strlen($filedata) < 28)) {









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  				if ($this->feof() || (($filedata .= $this->fread($this->getid3->fread_buffer_size())) === false)) {









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  					// get some more data, unless eof, in which case fail
  					return false;
  				}
  			}
  		}
  		$filedataoffset += strlen('OggS') - 1; // page, delimited by 'OggS'
  
  		$oggheader['stream_structver']  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  		$filedataoffset += 1;
  		$oggheader['flags_raw']         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  		$filedataoffset += 1;
  		$oggheader['flags']['fresh']    = (bool) ($oggheader['flags_raw'] & 0x01); // fresh packet
  		$oggheader['flags']['bos']      = (bool) ($oggheader['flags_raw'] & 0x02); // first page of logical bitstream (bos)
  		$oggheader['flags']['eos']      = (bool) ($oggheader['flags_raw'] & 0x04); // last page of logical bitstream (eos)
  
  		$oggheader['pcm_abs_position']  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
  		$filedataoffset += 8;
  		$oggheader['stream_serialno']   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$oggheader['page_seqno']        = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$oggheader['page_checksum']     = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
  		$filedataoffset += 4;
  		$oggheader['page_segments']     = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  		$filedataoffset += 1;
  		$oggheader['page_length'] = 0;
  		for ($i = 0; $i < $oggheader['page_segments']; $i++) {
  			$oggheader['segment_table'][$i] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
  			$filedataoffset += 1;
  			$oggheader['page_length'] += $oggheader['segment_table'][$i];
  		}
  		$oggheader['header_end_offset'] = $oggheader['page_start_offset'] + $filedataoffset;
  		$oggheader['page_end_offset']   = $oggheader['header_end_offset'] + $oggheader['page_length'];









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  		$this->fseek($oggheader['header_end_offset']);









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  		return $oggheader;
  	}









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      // http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-810005
  	public function ParseVorbisComments() {









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  		$info = &$this->getid3->info;









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  		$OriginalOffset = $this->ftell();









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  		$commentdataoffset = 0;
  		$VorbisCommentPage = 1;
  
  		switch ($info['audio']['dataformat']) {
  			case 'vorbis':









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  			case 'speex':









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  				$CommentStartOffset = $info['ogg']['pageheader'][$VorbisCommentPage]['page_start_offset'];  // Second Ogg page, after header block









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  				$this->fseek($CommentStartOffset);









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  				$commentdataoffset = 27 + $info['ogg']['pageheader'][$VorbisCommentPage]['page_segments'];









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  				$commentdata = $this->fread(self::OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1) + $commentdataoffset);









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  				if ($info['audio']['dataformat'] == 'vorbis') {
  					$commentdataoffset += (strlen('vorbis') + 1);
  				}









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  				break;
  
  			case 'flac':
  				$CommentStartOffset = $info['flac']['VORBIS_COMMENT']['raw']['offset'] + 4;









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  				$this->fseek($CommentStartOffset);
  				$commentdata = $this->fread($info['flac']['VORBIS_COMMENT']['raw']['block_length']);









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  				break;
  
  			default:
  				return false;









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  		}
  
  		$VendorSize = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
  		$commentdataoffset += 4;
  
  		$info['ogg']['vendor'] = substr($commentdata, $commentdataoffset, $VendorSize);
  		$commentdataoffset += $VendorSize;
  
  		$CommentsCount = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
  		$commentdataoffset += 4;
  		$info['avdataoffset'] = $CommentStartOffset + $commentdataoffset;
  
  		$basicfields = array('TITLE', 'ARTIST', 'ALBUM', 'TRACKNUMBER', 'GENRE', 'DATE', 'DESCRIPTION', 'COMMENT');
  		$ThisFileInfo_ogg_comments_raw = &$info['ogg']['comments_raw'];
  		for ($i = 0; $i < $CommentsCount; $i++) {
  
  			$ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] = $CommentStartOffset + $commentdataoffset;









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  			if ($this->ftell() < ($ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] + 4)) {









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  				if ($oggpageinfo = $this->ParseOggPageHeader()) {
  					$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
  
  					$VorbisCommentPage++;
  
  					// First, save what we haven't read yet
  					$AsYetUnusedData = substr($commentdata, $commentdataoffset);
  
  					// Then take that data off the end
  					$commentdata     = substr($commentdata, 0, $commentdataoffset);
  
  					// Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
  					$commentdata .= str_repeat("\x00", 27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
  					$commentdataoffset += (27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
  
  					// Finally, stick the unused data back on the end
  					$commentdata .= $AsYetUnusedData;









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  					//$commentdata .= $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);
  					$commentdata .= $this->fread($this->OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1));









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  				}
  
  			}
  			$ThisFileInfo_ogg_comments_raw[$i]['size'] = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
  
  			// replace avdataoffset with position just after the last vorbiscomment
  			$info['avdataoffset'] = $ThisFileInfo_ogg_comments_raw[$i]['dataoffset'] + $ThisFileInfo_ogg_comments_raw[$i]['size'] + 4;
  
  			$commentdataoffset += 4;
  			while ((strlen($commentdata) - $commentdataoffset) < $ThisFileInfo_ogg_comments_raw[$i]['size']) {
  				if (($ThisFileInfo_ogg_comments_raw[$i]['size'] > $info['avdataend']) || ($ThisFileInfo_ogg_comments_raw[$i]['size'] < 0)) {
  					$info['warning'][] = 'Invalid Ogg comment size (comment #'.$i.', claims to be '.number_format($ThisFileInfo_ogg_comments_raw[$i]['size']).' bytes) - aborting reading comments';
  					break 2;
  				}
  
  				$VorbisCommentPage++;
  
  				$oggpageinfo = $this->ParseOggPageHeader();
  				$info['ogg']['pageheader'][$oggpageinfo['page_seqno']] = $oggpageinfo;
  
  				// First, save what we haven't read yet
  				$AsYetUnusedData = substr($commentdata, $commentdataoffset);
  
  				// Then take that data off the end
  				$commentdata     = substr($commentdata, 0, $commentdataoffset);
  
  				// Add [headerlength] bytes of dummy data for the Ogg Page Header, just to keep absolute offsets correct
  				$commentdata .= str_repeat("\x00", 27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
  				$commentdataoffset += (27 + $info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_segments']);
  
  				// Finally, stick the unused data back on the end
  				$commentdata .= $AsYetUnusedData;









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  				//$commentdata .= $this->fread($info['ogg']['pageheader'][$oggpageinfo['page_seqno']]['page_length']);









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  				if (!isset($info['ogg']['pageheader'][$VorbisCommentPage])) {









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  					$info['warning'][] = 'undefined Vorbis Comment page "'.$VorbisCommentPage.'" at offset '.$this->ftell();









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  					break;
  				}









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  				$readlength = self::OggPageSegmentLength($info['ogg']['pageheader'][$VorbisCommentPage], 1);









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  				if ($readlength <= 0) {









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  					$info['warning'][] = 'invalid length Vorbis Comment page "'.$VorbisCommentPage.'" at offset '.$this->ftell();









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  					break;
  				}









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  				$commentdata .= $this->fread($readlength);









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  				//$filebaseoffset += $oggpageinfo['header_end_offset'] - $oggpageinfo['page_start_offset'];
  			}
  			$ThisFileInfo_ogg_comments_raw[$i]['offset'] = $commentdataoffset;
  			$commentstring = substr($commentdata, $commentdataoffset, $ThisFileInfo_ogg_comments_raw[$i]['size']);
  			$commentdataoffset += $ThisFileInfo_ogg_comments_raw[$i]['size'];
  
  			if (!$commentstring) {
  
  				// no comment?
  				$info['warning'][] = 'Blank Ogg comment ['.$i.']';
  
  			} elseif (strstr($commentstring, '=')) {
  
  				$commentexploded = explode('=', $commentstring, 2);









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  				$ThisFileInfo_ogg_comments_raw[$i]['key']   = strtoupper($commentexploded[0]);
  				$ThisFileInfo_ogg_comments_raw[$i]['value'] = (isset($commentexploded[1]) ? $commentexploded[1] : '');
  
  				if ($ThisFileInfo_ogg_comments_raw[$i]['key'] == 'METADATA_BLOCK_PICTURE') {
  
  					// http://wiki.xiph.org/VorbisComment#METADATA_BLOCK_PICTURE
  					// The unencoded format is that of the FLAC picture block. The fields are stored in big endian order as in FLAC, picture data is stored according to the relevant standard.
  					// http://flac.sourceforge.net/format.html#metadata_block_picture
  					$flac = new getid3_flac($this->getid3);
  					$flac->setStringMode(base64_decode($ThisFileInfo_ogg_comments_raw[$i]['value']));
  					$flac->parsePICTURE();
  					$info['ogg']['comments']['picture'][] = $flac->getid3->info['flac']['PICTURE'][0];
  					unset($flac);
  
  				} elseif ($ThisFileInfo_ogg_comments_raw[$i]['key'] == 'COVERART') {
  
  					$data = base64_decode($ThisFileInfo_ogg_comments_raw[$i]['value']);
  					$this->notice('Found deprecated COVERART tag, it should be replaced in honor of METADATA_BLOCK_PICTURE structure');
  					/** @todo use 'coverartmime' where available */
  					$imageinfo = getid3_lib::GetDataImageSize($data);
  					if ($imageinfo === false || !isset($imageinfo['mime'])) {
  						$this->warning('COVERART vorbiscomment tag contains invalid image');
  						continue;









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  					}









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  					$ogg = new self($this->getid3);
  					$ogg->setStringMode($data);
  					$info['ogg']['comments']['picture'][] = array(
  						'image_mime' => $imageinfo['mime'],
  						'data'       => $ogg->saveAttachment('coverart', 0, strlen($data), $imageinfo['mime']),
  					);
  					unset($ogg);









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  				} else {









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  					$info['ogg']['comments'][strtolower($ThisFileInfo_ogg_comments_raw[$i]['key'])][] = $ThisFileInfo_ogg_comments_raw[$i]['value'];









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  				}









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  			} else {
  
  				$info['warning'][] = '[known problem with CDex >= v1.40, < v1.50b7] Invalid Ogg comment name/value pair ['.$i.']: '.$commentstring;
  
  			}









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  			unset($ThisFileInfo_ogg_comments_raw[$i]);









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  		}









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  		unset($ThisFileInfo_ogg_comments_raw);









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  		// Replay Gain Adjustment
  		// http://privatewww.essex.ac.uk/~djmrob/replaygain/
  		if (isset($info['ogg']['comments']) && is_array($info['ogg']['comments'])) {
  			foreach ($info['ogg']['comments'] as $index => $commentvalue) {
  				switch ($index) {
  					case 'rg_audiophile':
  					case 'replaygain_album_gain':
  						$info['replay_gain']['album']['adjustment'] = (double) $commentvalue[0];
  						unset($info['ogg']['comments'][$index]);
  						break;
  
  					case 'rg_radio':
  					case 'replaygain_track_gain':
  						$info['replay_gain']['track']['adjustment'] = (double) $commentvalue[0];
  						unset($info['ogg']['comments'][$index]);
  						break;
  
  					case 'replaygain_album_peak':
  						$info['replay_gain']['album']['peak'] = (double) $commentvalue[0];
  						unset($info['ogg']['comments'][$index]);
  						break;
  
  					case 'rg_peak':
  					case 'replaygain_track_peak':
  						$info['replay_gain']['track']['peak'] = (double) $commentvalue[0];
  						unset($info['ogg']['comments'][$index]);
  						break;
  
  					case 'replaygain_reference_loudness':
  						$info['replay_gain']['reference_volume'] = (double) $commentvalue[0];
  						unset($info['ogg']['comments'][$index]);
  						break;
  
  					default:
  						// do nothing
  						break;
  				}
  			}
  		}









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  		$this->fseek($OriginalOffset);









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  		return true;
  	}









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  	public static function SpeexBandModeLookup($mode) {









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  		static $SpeexBandModeLookup = array();
  		if (empty($SpeexBandModeLookup)) {
  			$SpeexBandModeLookup[0] = 'narrow';
  			$SpeexBandModeLookup[1] = 'wide';
  			$SpeexBandModeLookup[2] = 'ultra-wide';
  		}
  		return (isset($SpeexBandModeLookup[$mode]) ? $SpeexBandModeLookup[$mode] : null);
  	}









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  	public static function OggPageSegmentLength($OggInfoArray, $SegmentNumber=1) {









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  		for ($i = 0; $i < $SegmentNumber; $i++) {
  			$segmentlength = 0;
  			foreach ($OggInfoArray['segment_table'] as $key => $value) {
  				$segmentlength += $value;
  				if ($value < 255) {
  					break;
  				}
  			}
  		}
  		return $segmentlength;
  	}









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  	public static function get_quality_from_nominal_bitrate($nominal_bitrate) {









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  		// decrease precision
  		$nominal_bitrate = $nominal_bitrate / 1000;
  
  		if ($nominal_bitrate < 128) {
  			// q-1 to q4
  			$qval = ($nominal_bitrate - 64) / 16;
  		} elseif ($nominal_bitrate < 256) {
  			// q4 to q8
  			$qval = $nominal_bitrate / 32;
  		} elseif ($nominal_bitrate < 320) {
  			// q8 to q9
  			$qval = ($nominal_bitrate + 256) / 64;
  		} else {
  			// q9 to q10
  			$qval = ($nominal_bitrate + 1300) / 180;
  		}
  		//return $qval; // 5.031324
  		//return intval($qval); // 5
  		return round($qval, 1); // 5 or 4.9
  	}
  
  }