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/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich &lt;info@getid3.org&gt;               //
//  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.ogg.php                                        //
// module for analyzing Ogg Vorbis, OggFLAC and Speex files    //
// dependencies: module.audio.flac.php                         //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined(&#039;GETID3_INCLUDEPATH&#039;)) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}
getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.&#039;module.audio.flac.php&#039;, __FILE__, true);

class getid3_ogg extends getid3_handler
{
	/**
	 * @link http://xiph.org/vorbis/doc/Vorbis_I_spec.html
	 *
	 * @return bool
	 */
	public function Analyze() {
		$info = &amp;$this-&gt;getid3-&gt;info;

		$info[&#039;fileformat&#039;] = &#039;ogg&#039;;

		// Warn about illegal tags - only vorbiscomments are allowed
		if (isset($info[&#039;id3v2&#039;])) {
			$this-&gt;warning(&#039;Illegal ID3v2 tag present.&#039;);
		}
		if (isset($info[&#039;id3v1&#039;])) {
			$this-&gt;warning(&#039;Illegal ID3v1 tag present.&#039;);
		}
		if (isset($info[&#039;ape&#039;])) {
			$this-&gt;warning(&#039;Illegal APE tag present.&#039;);
		}


		// Page 1 - Stream Header

		$this-&gt;fseek($info[&#039;avdataoffset&#039;]);

		$oggpageinfo = $this-&gt;ParseOggPageHeader();
		$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]] = $oggpageinfo;

		if ($this-&gt;ftell() &gt;= $this-&gt;getid3-&gt;fread_buffer_size()) {
			$this-&gt;error(&#039;Could not find start of Ogg page in the first &#039;.$this-&gt;getid3-&gt;fread_buffer_size().&#039; bytes (this might not be an Ogg-Vorbis file?)&#039;);
			unset($info[&#039;fileformat&#039;]);
			unset($info[&#039;ogg&#039;]);
			return false;
		}

		$filedata = $this-&gt;fread($oggpageinfo[&#039;page_length&#039;]);
		$filedataoffset = 0;

		if (substr($filedata, 0, 4) == &#039;fLaC&#039;) {

			$info[&#039;audio&#039;][&#039;dataformat&#039;]   = &#039;flac&#039;;
			$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;vbr&#039;;
			$info[&#039;audio&#039;][&#039;lossless&#039;]     = true;

		} elseif (substr($filedata, 1, 6) == &#039;vorbis&#039;) {

			$this-&gt;ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);

		} elseif (substr($filedata, 0, 8) == &#039;OpusHead&#039;) {

			if ($this-&gt;ParseOpusPageHeader($filedata, $filedataoffset, $oggpageinfo) === false) {
				return false;
			}

		} elseif (substr($filedata, 0, 8) == &#039;Speex   &#039;) {

			// http://www.speex.org/manual/node10.html

			$info[&#039;audio&#039;][&#039;dataformat&#039;]   = &#039;speex&#039;;
			$info[&#039;mime_type&#039;]             = &#039;audio/speex&#039;;
			$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;abr&#039;;
			$info[&#039;audio&#039;][&#039;lossless&#039;]     = false;

			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;speex_string&#039;]           =                              substr($filedata, $filedataoffset, 8); // hard-coded to &#039;Speex   &#039;
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;speex_version&#039;]          =                              substr($filedata, $filedataoffset, 20);
			$filedataoffset += 20;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;speex_version_id&#039;]       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;header_size&#039;]            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;rate&#039;]                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;mode&#039;]                   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;mode_bitstream_version&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;nb_channels&#039;]            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;bitrate&#039;]                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;framesize&#039;]              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;vbr&#039;]                    = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;frames_per_packet&#039;]      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;extra_headers&#039;]          = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;reserved1&#039;]              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;reserved2&#039;]              = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
			$filedataoffset += 4;

			$info[&#039;speex&#039;][&#039;speex_version&#039;] = trim($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;speex_version&#039;]);
			$info[&#039;speex&#039;][&#039;sample_rate&#039;]   = $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;rate&#039;];
			$info[&#039;speex&#039;][&#039;channels&#039;]      = $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;nb_channels&#039;];
			$info[&#039;speex&#039;][&#039;vbr&#039;]           = (bool) $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;vbr&#039;];
			$info[&#039;speex&#039;][&#039;band_type&#039;]     = $this-&gt;SpeexBandModeLookup($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;mode&#039;]);

			$info[&#039;audio&#039;][&#039;sample_rate&#039;]   = $info[&#039;speex&#039;][&#039;sample_rate&#039;];
			$info[&#039;audio&#039;][&#039;channels&#039;]      = $info[&#039;speex&#039;][&#039;channels&#039;];
			if ($info[&#039;speex&#039;][&#039;vbr&#039;]) {
				$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;vbr&#039;;
			}

		} elseif (substr($filedata, 0, 7) == &quot;\x80&quot;.&#039;theora&#039;) {

			// http://www.theora.org/doc/Theora.pdf (section 6.2)

			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;theora_magic&#039;]             =                           substr($filedata, $filedataoffset,  7); // hard-coded to &quot;\x80.&#039;theora&#039;
			$filedataoffset += 7;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;version_major&#039;]            = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;version_minor&#039;]            = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;version_revision&#039;]         = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_width_macroblocks&#039;]  = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  2));
			$filedataoffset += 2;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_height_macroblocks&#039;] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  2));
			$filedataoffset += 2;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;resolution_x&#039;]             = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  3));
			$filedataoffset += 3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;resolution_y&#039;]             = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  3));
			$filedataoffset += 3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;picture_offset_x&#039;]         = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;picture_offset_y&#039;]         = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_rate_numerator&#039;]     = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_rate_denominator&#039;]   = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  4));
			$filedataoffset += 4;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_aspect_numerator&#039;]   = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  3));
			$filedataoffset += 3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_aspect_denominator&#039;] = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  3));
			$filedataoffset += 3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;color_space_id&#039;]           = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  1));
			$filedataoffset += 1;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;nominal_bitrate&#039;]          = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  3));
			$filedataoffset += 3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;flags&#039;]                    = getid3_lib::BigEndian2Int(substr($filedata, $filedataoffset,  2));
			$filedataoffset += 2;

			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;quality&#039;]         = ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;flags&#039;] &amp; 0xFC00) &gt;&gt; 10;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;kfg_shift&#039;]       = ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;flags&#039;] &amp; 0x03E0) &gt;&gt;  5;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_format_id&#039;] = ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;flags&#039;] &amp; 0x0018) &gt;&gt;  3;
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;reserved&#039;]        = ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;flags&#039;] &amp; 0x0007) &gt;&gt;  0; // should be 0
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;color_space&#039;]     = self::TheoraColorSpace($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;color_space_id&#039;]);
			$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_format&#039;]    = self::TheoraPixelFormat($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_format_id&#039;]);

			$info[&#039;video&#039;][&#039;dataformat&#039;]   = &#039;theora&#039;;
			$info[&#039;mime_type&#039;]             = &#039;video/ogg&#039;;
			//$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;abr&#039;;
			//$info[&#039;audio&#039;][&#039;lossless&#039;]     = false;
			$info[&#039;video&#039;][&#039;resolution_x&#039;] = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;resolution_x&#039;];
			$info[&#039;video&#039;][&#039;resolution_y&#039;] = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;resolution_y&#039;];
			if ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_rate_denominator&#039;] &gt; 0) {
				$info[&#039;video&#039;][&#039;frame_rate&#039;] = (float) $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_rate_numerator&#039;] / $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;frame_rate_denominator&#039;];
			}
			if ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_aspect_denominator&#039;] &gt; 0) {
				$info[&#039;video&#039;][&#039;pixel_aspect_ratio&#039;] = (float) $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_aspect_numerator&#039;] / $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;theora&#039;][&#039;pixel_aspect_denominator&#039;];
			}
$this-&gt;warning(&#039;Ogg Theora (v3) not fully supported in this version of getID3 [&#039;.$this-&gt;getid3-&gt;version().&#039;] -- bitrate, playtime and all audio data are currently unavailable&#039;);


		} elseif (substr($filedata, 0, 8) == &quot;fishead\x00&quot;) {

			// Ogg Skeleton version 3.0 Format Specification
			// http://xiph.org/ogg/doc/skeleton.html
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;version_major&#039;]                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
			$filedataoffset += 2;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;version_minor&#039;]                = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
			$filedataoffset += 2;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;presentationtime_numerator&#039;]   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;presentationtime_denominator&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;basetime_numerator&#039;]           = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;basetime_denominator&#039;]         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
			$filedataoffset += 8;
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;utc&#039;]                          = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 20));
			$filedataoffset += 20;

			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;version&#039;]          = $info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;version_major&#039;].&#039;.&#039;.$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;version_minor&#039;];
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;presentationtime&#039;] = getid3_lib::SafeDiv($info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;presentationtime_numerator&#039;], $info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;presentationtime_denominator&#039;]);
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;basetime&#039;]         = getid3_lib::SafeDiv($info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;basetime_numerator&#039;],         $info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;basetime_denominator&#039;]);
			$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;utc&#039;]              = $info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fishead&#039;][&#039;raw&#039;][&#039;utc&#039;];


			$counter = 0;
			do {
				$oggpageinfo = $this-&gt;ParseOggPageHeader();
				$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;].&#039;.&#039;.$counter++] = $oggpageinfo;
				$filedata = $this-&gt;fread($oggpageinfo[&#039;page_length&#039;]);
				$this-&gt;fseek($oggpageinfo[&#039;page_end_offset&#039;]);

				if (substr($filedata, 0, 8) == &quot;fisbone\x00&quot;) {

					$filedataoffset = 8;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;message_header_offset&#039;]   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
					$filedataoffset += 4;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;serial_number&#039;]           = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
					$filedataoffset += 4;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;number_header_packets&#039;]   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
					$filedataoffset += 4;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;granulerate_numerator&#039;]   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
					$filedataoffset += 8;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;granulerate_denominator&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
					$filedataoffset += 8;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;basegranule&#039;]             = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  8));
					$filedataoffset += 8;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;preroll&#039;]                 = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
					$filedataoffset += 4;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;granuleshift&#039;]            = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  1));
					$filedataoffset += 1;
					$info[&#039;ogg&#039;][&#039;skeleton&#039;][&#039;fisbone&#039;][&#039;raw&#039;][&#039;padding&#039;]                 =                              substr($filedata, $filedataoffset,  3);
					$filedataoffset += 3;

				} elseif (substr($filedata, 1, 6) == &#039;theora&#039;) {

					$info[&#039;video&#039;][&#039;dataformat&#039;] = &#039;theora1&#039;;
					$this-&gt;error(&#039;Ogg Theora (v1) not correctly handled in this version of getID3 [&#039;.$this-&gt;getid3-&gt;version().&#039;]&#039;);
					//break;

				} elseif (substr($filedata, 1, 6) == &#039;vorbis&#039;) {

					$this-&gt;ParseVorbisPageHeader($filedata, $filedataoffset, $oggpageinfo);

				} else {
					$this-&gt;error(&#039;unexpected&#039;);
					//break;
				}
			//} while ($oggpageinfo[&#039;page_seqno&#039;] == 0);
			} while (($oggpageinfo[&#039;page_seqno&#039;] == 0) &amp;&amp; (substr($filedata, 0, 8) != &quot;fisbone\x00&quot;));

			$this-&gt;fseek($oggpageinfo[&#039;page_start_offset&#039;]);

			$this-&gt;error(&#039;Ogg Skeleton not correctly handled in this version of getID3 [&#039;.$this-&gt;getid3-&gt;version().&#039;]&#039;);
			//return false;

		} elseif (substr($filedata, 0, 5) == &quot;\x7F&quot;.&#039;FLAC&#039;) {
			// https://xiph.org/flac/ogg_mapping.html

			$info[&#039;audio&#039;][&#039;dataformat&#039;]   = &#039;flac&#039;;
			$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;vbr&#039;;
			$info[&#039;audio&#039;][&#039;lossless&#039;]     = true;

			$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;version_major&#039;]  =                         ord(substr($filedata,  5, 1));
			$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;version_minor&#039;]  =                         ord(substr($filedata,  6, 1));
			$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;header_packets&#039;] =   getid3_lib::BigEndian2Int(substr($filedata,  7, 2)) + 1; // &quot;A two-byte, big-endian binary number signifying the number of header (non-audio) packets, not including this one. This number may be zero (0x0000) to signify &#039;unknown&#039; but be aware that some decoders may not be able to handle such streams.&quot;
			$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;magic&#039;]          =                             substr($filedata,  9, 4);
			if ($info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;magic&#039;] != &#039;fLaC&#039;) {
				$this-&gt;error(&#039;Ogg-FLAC expecting &quot;fLaC&quot;, found &quot;&#039;.$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;magic&#039;].&#039;&quot; (&#039;.trim(getid3_lib::PrintHexBytes($info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;magic&#039;])).&#039;)&#039;);
				return false;
			}
			$info[&#039;ogg&#039;][&#039;flac&#039;][&#039;header&#039;][&#039;STREAMINFO_bytes&#039;] = getid3_lib::BigEndian2Int(substr($filedata, 13, 4));
			$info[&#039;flac&#039;][&#039;STREAMINFO&#039;] = getid3_flac::parseSTREAMINFOdata(substr($filedata, 17, 34));
			if (!empty($info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;sample_rate&#039;])) {
				$info[&#039;audio&#039;][&#039;bitrate_mode&#039;]    = &#039;vbr&#039;;
				$info[&#039;audio&#039;][&#039;sample_rate&#039;]     = $info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;sample_rate&#039;];
				$info[&#039;audio&#039;][&#039;channels&#039;]        = $info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;channels&#039;];
				$info[&#039;audio&#039;][&#039;bits_per_sample&#039;] = $info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;bits_per_sample&#039;];
				$info[&#039;playtime_seconds&#039;]         = getid3_lib::SafeDiv($info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;samples_stream&#039;], $info[&#039;flac&#039;][&#039;STREAMINFO&#039;][&#039;sample_rate&#039;]);
			}

		} else {

			$this-&gt;error(&#039;Expecting one of &quot;vorbis&quot;, &quot;Speex&quot;, &quot;OpusHead&quot;, &quot;vorbis&quot;, &quot;fishhead&quot;, &quot;theora&quot;, &quot;fLaC&quot; identifier strings, found &quot;&#039;.substr($filedata, 0, 8).&#039;&quot;&#039;);
			unset($info[&#039;ogg&#039;]);
			unset($info[&#039;mime_type&#039;]);
			return false;

		}

		// Page 2 - Comment Header
		$oggpageinfo = $this-&gt;ParseOggPageHeader();
		$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]] = $oggpageinfo;

		switch ($info[&#039;audio&#039;][&#039;dataformat&#039;]) {
			case &#039;vorbis&#039;:
				$filedata = $this-&gt;fread($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_length&#039;]);
				$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;packet_type&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, 0, 1));
				$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;stream_type&#039;] =                              substr($filedata, 1, 6); // hard-coded to &#039;vorbis&#039;

				$this-&gt;ParseVorbisComments();
				break;

			case &#039;flac&#039;:
				$flac = new getid3_flac($this-&gt;getid3);
				if (!$flac-&gt;parseMETAdata()) {
					$this-&gt;error(&#039;Failed to parse FLAC headers&#039;);
					return false;
				}
				unset($flac);
				break;

			case &#039;speex&#039;:
				$this-&gt;fseek($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_length&#039;], SEEK_CUR);
				$this-&gt;ParseVorbisComments();
				break;

			case &#039;opus&#039;:
				$filedata = $this-&gt;fread($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_length&#039;]);
				$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;stream_type&#039;] = substr($filedata, 0, 8); // hard-coded to &#039;OpusTags&#039;
				if(substr($filedata, 0, 8)  != &#039;OpusTags&#039;) {
					$this-&gt;error(&#039;Expected &quot;OpusTags&quot; as header but got &quot;&#039;.substr($filedata, 0, 8).&#039;&quot;&#039;);
					return false;
				}

				$this-&gt;ParseVorbisComments();
				break;

		}

		// Last Page - Number of Samples
		if (!getid3_lib::intValueSupported($info[&#039;avdataend&#039;])) {

			$this-&gt;warning(&#039;Unable to parse Ogg end chunk file (PHP does not support file operations beyond &#039;.round(PHP_INT_MAX / 1073741824).&#039;GB)&#039;);

		} else {

			$this-&gt;fseek(max($info[&#039;avdataend&#039;] - $this-&gt;getid3-&gt;fread_buffer_size(), 0));
			$LastChunkOfOgg = strrev($this-&gt;fread($this-&gt;getid3-&gt;fread_buffer_size()));
			if ($LastOggSpostion = strpos($LastChunkOfOgg, &#039;SggO&#039;)) {
				$this-&gt;fseek($info[&#039;avdataend&#039;] - ($LastOggSpostion + strlen(&#039;SggO&#039;)));
				$info[&#039;avdataend&#039;] = $this-&gt;ftell();
				$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;eos&#039;] = $this-&gt;ParseOggPageHeader();
				$info[&#039;ogg&#039;][&#039;samples&#039;]   = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;eos&#039;][&#039;pcm_abs_position&#039;];
				if ($info[&#039;ogg&#039;][&#039;samples&#039;] == 0) {
					$this-&gt;error(&#039;Corrupt Ogg file: eos.number of samples == zero&#039;);
					return false;
				}
				if (!empty($info[&#039;audio&#039;][&#039;sample_rate&#039;])) {
					$info[&#039;ogg&#039;][&#039;bitrate_average&#039;] = (($info[&#039;avdataend&#039;] - $info[&#039;avdataoffset&#039;]) * 8) * $info[&#039;audio&#039;][&#039;sample_rate&#039;] / $info[&#039;ogg&#039;][&#039;samples&#039;];
				}
			}

		}

		if (!empty($info[&#039;ogg&#039;][&#039;bitrate_average&#039;])) {
			$info[&#039;audio&#039;][&#039;bitrate&#039;] = $info[&#039;ogg&#039;][&#039;bitrate_average&#039;];
		} elseif (!empty($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;])) {
			$info[&#039;audio&#039;][&#039;bitrate&#039;] = $info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;];
		} elseif (!empty($info[&#039;ogg&#039;][&#039;bitrate_min&#039;]) &amp;&amp; !empty($info[&#039;ogg&#039;][&#039;bitrate_max&#039;])) {
			$info[&#039;audio&#039;][&#039;bitrate&#039;] = ($info[&#039;ogg&#039;][&#039;bitrate_min&#039;] + $info[&#039;ogg&#039;][&#039;bitrate_max&#039;]) / 2;
		}
		if (isset($info[&#039;audio&#039;][&#039;bitrate&#039;]) &amp;&amp; !isset($info[&#039;playtime_seconds&#039;])) {
			if ($info[&#039;audio&#039;][&#039;bitrate&#039;] == 0) {
				$this-&gt;error(&#039;Corrupt Ogg file: bitrate_audio == zero&#039;);
				return false;
			}
			$info[&#039;playtime_seconds&#039;] = (float) ((($info[&#039;avdataend&#039;] - $info[&#039;avdataoffset&#039;]) * 8) / $info[&#039;audio&#039;][&#039;bitrate&#039;]);
		}

		if (isset($info[&#039;ogg&#039;][&#039;vendor&#039;])) {
			$info[&#039;audio&#039;][&#039;encoder&#039;] = preg_replace(&#039;/^Encoded with /&#039;, &#039;&#039;, $info[&#039;ogg&#039;][&#039;vendor&#039;]);

			// Vorbis only
			if ($info[&#039;audio&#039;][&#039;dataformat&#039;] == &#039;vorbis&#039;) {

				// Vorbis 1.0 starts with Xiph.Org
				if  (preg_match(&#039;/^Xiph.Org/&#039;, $info[&#039;audio&#039;][&#039;encoder&#039;])) {

					if ($info[&#039;audio&#039;][&#039;bitrate_mode&#039;] == &#039;abr&#039;) {

						// Set -b 128 on abr files
						$info[&#039;audio&#039;][&#039;encoder_options&#039;] = &#039;-b &#039;.round($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;] / 1000);

					} elseif (($info[&#039;audio&#039;][&#039;bitrate_mode&#039;] == &#039;vbr&#039;) &amp;&amp; ($info[&#039;audio&#039;][&#039;channels&#039;] == 2) &amp;&amp; ($info[&#039;audio&#039;][&#039;sample_rate&#039;] &gt;= 44100) &amp;&amp; ($info[&#039;audio&#039;][&#039;sample_rate&#039;] &lt;= 48000)) {
						// Set -q N on vbr files
						$info[&#039;audio&#039;][&#039;encoder_options&#039;] = &#039;-q &#039;.$this-&gt;get_quality_from_nominal_bitrate($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;]);

					}
				}

				if (empty($info[&#039;audio&#039;][&#039;encoder_options&#039;]) &amp;&amp; !empty($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;])) {
					$info[&#039;audio&#039;][&#039;encoder_options&#039;] = &#039;Nominal bitrate: &#039;.intval(round($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;] / 1000)).&#039;kbps&#039;;
				}
			}
		}

		return true;
	}

	/**
	 * @param string $filedata
	 * @param int    $filedataoffset
	 * @param array  $oggpageinfo
	 *
	 * @return bool
	 */
	public function ParseVorbisPageHeader(&amp;$filedata, &amp;$filedataoffset, &amp;$oggpageinfo) {
		$info = &amp;$this-&gt;getid3-&gt;info;
		$info[&#039;audio&#039;][&#039;dataformat&#039;] = &#039;vorbis&#039;;
		$info[&#039;audio&#039;][&#039;lossless&#039;]   = false;

		$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;packet_type&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
		$filedataoffset += 1;
		$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;stream_type&#039;] = substr($filedata, $filedataoffset, 6); // hard-coded to &#039;vorbis&#039;
		$filedataoffset += 6;
		$info[&#039;ogg&#039;][&#039;bitstreamversion&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$info[&#039;ogg&#039;][&#039;numberofchannels&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
		$filedataoffset += 1;
		$info[&#039;audio&#039;][&#039;channels&#039;]       = $info[&#039;ogg&#039;][&#039;numberofchannels&#039;];
		$info[&#039;ogg&#039;][&#039;samplerate&#039;]       = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		if ($info[&#039;ogg&#039;][&#039;samplerate&#039;] == 0) {
			$this-&gt;error(&#039;Corrupt Ogg file: sample rate == zero&#039;);
			return false;
		}
		$info[&#039;audio&#039;][&#039;sample_rate&#039;]    = $info[&#039;ogg&#039;][&#039;samplerate&#039;];
		$info[&#039;ogg&#039;][&#039;samples&#039;]          = 0; // filled in later
		$info[&#039;ogg&#039;][&#039;bitrate_average&#039;]  = 0; // filled in later
		$info[&#039;ogg&#039;][&#039;bitrate_max&#039;]      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;]  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$info[&#039;ogg&#039;][&#039;bitrate_min&#039;]      = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$info[&#039;ogg&#039;][&#039;blocksize_small&#039;]  = pow(2,  getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) &amp; 0x0F);
		$info[&#039;ogg&#039;][&#039;blocksize_large&#039;]  = pow(2, (getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)) &amp; 0xF0) &gt;&gt; 4);
		$info[&#039;ogg&#039;][&#039;stop_bit&#039;]         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1)); // must be 1, marks end of packet

		$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;vbr&#039;; // overridden if actually abr
		if ($info[&#039;ogg&#039;][&#039;bitrate_max&#039;] == 0xFFFFFFFF) {
			unset($info[&#039;ogg&#039;][&#039;bitrate_max&#039;]);
			$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;abr&#039;;
		}
		if ($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;] == 0xFFFFFFFF) {
			unset($info[&#039;ogg&#039;][&#039;bitrate_nominal&#039;]);
		}
		if ($info[&#039;ogg&#039;][&#039;bitrate_min&#039;] == 0xFFFFFFFF) {
			unset($info[&#039;ogg&#039;][&#039;bitrate_min&#039;]);
			$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;abr&#039;;
		}
		return true;
	}

	/**
	 * @link http://tools.ietf.org/html/draft-ietf-codec-oggopus-03
	 *
	 * @param string $filedata
	 * @param int    $filedataoffset
	 * @param array  $oggpageinfo
	 *
	 * @return bool
	 */
	public function ParseOpusPageHeader(&amp;$filedata, &amp;$filedataoffset, &amp;$oggpageinfo) {
		$info = &amp;$this-&gt;getid3-&gt;info;
		$info[&#039;audio&#039;][&#039;dataformat&#039;]   = &#039;opus&#039;;
		$info[&#039;mime_type&#039;]             = &#039;audio/ogg; codecs=opus&#039;;

		/** @todo find a usable way to detect abr (vbr that is padded to be abr) */
		$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;vbr&#039;;

		$info[&#039;audio&#039;][&#039;lossless&#039;]     = false;

		$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;opus_magic&#039;] = substr($filedata, $filedataoffset, 8); // hard-coded to &#039;OpusHead&#039;
		$filedataoffset += 8;
		$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;version&#039;]    = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  1));
		$filedataoffset += 1;

		if ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;version&#039;] &lt; 1 || $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;version&#039;] &gt; 15) {
			$this-&gt;error(&#039;Unknown opus version number (only accepting 1-15)&#039;);
			return false;
		}

		$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;out_channel_count&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  1));
		$filedataoffset += 1;

		if ($info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;out_channel_count&#039;] == 0) {
			$this-&gt;error(&#039;Invalid channel count in opus header (must not be zero)&#039;);
			return false;
		}

		$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;pre_skip&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
		$filedataoffset += 2;

		$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;input_sample_rate&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  4));
		$filedataoffset += 4;

		//$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;output_gain&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  2));
		//$filedataoffset += 2;

		//$info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;channel_mapping_family&#039;] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset,  1));
		//$filedataoffset += 1;

		$info[&#039;opus&#039;][&#039;opus_version&#039;]       = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;version&#039;];
		$info[&#039;opus&#039;][&#039;sample_rate_input&#039;]  = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;input_sample_rate&#039;];
		$info[&#039;opus&#039;][&#039;out_channel_count&#039;]  = $info[&#039;ogg&#039;][&#039;pageheader&#039;][&#039;opus&#039;][&#039;out_channel_count&#039;];

		$info[&#039;audio&#039;][&#039;channels&#039;]          = $info[&#039;opus&#039;][&#039;out_channel_count&#039;];
		$info[&#039;audio&#039;][&#039;sample_rate_input&#039;] = $info[&#039;opus&#039;][&#039;sample_rate_input&#039;];
		$info[&#039;audio&#039;][&#039;sample_rate&#039;]       = 48000; // &quot;All Opus audio is coded at 48 kHz, and should also be decoded at 48 kHz for playback (unless the target hardware does not support this sampling rate). However, this field may be used to resample the audio back to the original sampling rate, for example, when saving the output to a file.&quot; -- https://mf4.xiph.org/jenkins/view/opus/job/opusfile-unix/ws/doc/html/structOpusHead.html
		return true;
	}

	/**
	 * @return array|false
	 */
	public function ParseOggPageHeader() {
		// http://xiph.org/ogg/vorbis/doc/framing.html
		$oggheader = array();
		$oggheader[&#039;page_start_offset&#039;] = $this-&gt;ftell(); // where we started from in the file

		$filedata = $this-&gt;fread($this-&gt;getid3-&gt;fread_buffer_size());
		$filedataoffset = 0;
		while (substr($filedata, $filedataoffset++, 4) != &#039;OggS&#039;) {
			if (($this-&gt;ftell() - $oggheader[&#039;page_start_offset&#039;]) &gt;= $this-&gt;getid3-&gt;fread_buffer_size()) {
				// should be found before here
				return false;
			}
			if (($filedataoffset + 28) &gt; strlen($filedata)) {
				if ($this-&gt;feof() || (($filedata .= $this-&gt;fread($this-&gt;getid3-&gt;fread_buffer_size())) === &#039;&#039;)) {
					// get some more data, unless eof, in which case fail
					return false;
				}
			}
		}
		$filedataoffset += strlen(&#039;OggS&#039;) - 1; // page, delimited by &#039;OggS&#039;

		$oggheader[&#039;stream_structver&#039;]  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
		$filedataoffset += 1;
		$oggheader[&#039;flags_raw&#039;]         = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
		$filedataoffset += 1;
		$oggheader[&#039;flags&#039;][&#039;fresh&#039;]    = (bool) ($oggheader[&#039;flags_raw&#039;] &amp; 0x01); // fresh packet
		$oggheader[&#039;flags&#039;][&#039;bos&#039;]      = (bool) ($oggheader[&#039;flags_raw&#039;] &amp; 0x02); // first page of logical bitstream (bos)
		$oggheader[&#039;flags&#039;][&#039;eos&#039;]      = (bool) ($oggheader[&#039;flags_raw&#039;] &amp; 0x04); // last page of logical bitstream (eos)

		$oggheader[&#039;pcm_abs_position&#039;]  = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 8));
		$filedataoffset += 8;
		$oggheader[&#039;stream_serialno&#039;]   = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$oggheader[&#039;page_seqno&#039;]        = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$oggheader[&#039;page_checksum&#039;]     = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 4));
		$filedataoffset += 4;
		$oggheader[&#039;page_segments&#039;]     = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
		$filedataoffset += 1;
		$oggheader[&#039;page_length&#039;] = 0;
		for ($i = 0; $i &lt; $oggheader[&#039;page_segments&#039;]; $i++) {
			$oggheader[&#039;segment_table&#039;][$i] = getid3_lib::LittleEndian2Int(substr($filedata, $filedataoffset, 1));
			$filedataoffset += 1;
			$oggheader[&#039;page_length&#039;] += $oggheader[&#039;segment_table&#039;][$i];
		}
		$oggheader[&#039;header_end_offset&#039;] = $oggheader[&#039;page_start_offset&#039;] + $filedataoffset;
		$oggheader[&#039;page_end_offset&#039;]   = $oggheader[&#039;header_end_offset&#039;] + $oggheader[&#039;page_length&#039;];
		$this-&gt;fseek($oggheader[&#039;header_end_offset&#039;]);

		return $oggheader;
	}

	/**
	 * @link http://xiph.org/vorbis/doc/Vorbis_I_spec.html#x1-810005
	 *
	 * @return bool
	 */
	public function ParseVorbisComments() {
		$info = &amp;$this-&gt;getid3-&gt;info;

		$OriginalOffset = $this-&gt;ftell();
		$commentdata = null;
		$commentdataoffset = 0;
		$VorbisCommentPage = 1;
		$CommentStartOffset = 0;

		switch ($info[&#039;audio&#039;][&#039;dataformat&#039;]) {
			case &#039;vorbis&#039;:
			case &#039;speex&#039;:
			case &#039;opus&#039;:
				$CommentStartOffset = $info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage][&#039;page_start_offset&#039;];  // Second Ogg page, after header block
				$this-&gt;fseek($CommentStartOffset);
				$commentdataoffset = 27 + $info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage][&#039;page_segments&#039;];
				$commentdata = $this-&gt;fread(self::OggPageSegmentLength($info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage], 1) + $commentdataoffset);

				if ($info[&#039;audio&#039;][&#039;dataformat&#039;] == &#039;vorbis&#039;) {
					$commentdataoffset += (strlen(&#039;vorbis&#039;) + 1);
				}
				else if ($info[&#039;audio&#039;][&#039;dataformat&#039;] == &#039;opus&#039;) {
					$commentdataoffset += strlen(&#039;OpusTags&#039;);
				}

				break;

			case &#039;flac&#039;:
				$CommentStartOffset = $info[&#039;flac&#039;][&#039;VORBIS_COMMENT&#039;][&#039;raw&#039;][&#039;offset&#039;] + 4;
				$this-&gt;fseek($CommentStartOffset);
				$commentdata = $this-&gt;fread($info[&#039;flac&#039;][&#039;VORBIS_COMMENT&#039;][&#039;raw&#039;][&#039;block_length&#039;]);
				break;

			default:
				return false;
		}

		$VendorSize = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
		$commentdataoffset += 4;

		$info[&#039;ogg&#039;][&#039;vendor&#039;] = substr($commentdata, $commentdataoffset, $VendorSize);
		$commentdataoffset += $VendorSize;

		$CommentsCount = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));
		$commentdataoffset += 4;
		$info[&#039;avdataoffset&#039;] = $CommentStartOffset + $commentdataoffset;

		$basicfields = array(&#039;TITLE&#039;, &#039;ARTIST&#039;, &#039;ALBUM&#039;, &#039;TRACKNUMBER&#039;, &#039;GENRE&#039;, &#039;DATE&#039;, &#039;DESCRIPTION&#039;, &#039;COMMENT&#039;);
		$ThisFileInfo_ogg_comments_raw = &amp;$info[&#039;ogg&#039;][&#039;comments_raw&#039;];
		for ($i = 0; $i &lt; $CommentsCount; $i++) {

			if ($i &gt;= 10000) {
				// https://github.com/owncloud/music/issues/212#issuecomment-43082336
				$this-&gt;warning(&#039;Unexpectedly large number (&#039;.$CommentsCount.&#039;) of Ogg comments - breaking after reading &#039;.$i.&#039; comments&#039;);
				break;
			}

			$ThisFileInfo_ogg_comments_raw[$i][&#039;dataoffset&#039;] = $CommentStartOffset + $commentdataoffset;

			if ($this-&gt;ftell() &lt; ($ThisFileInfo_ogg_comments_raw[$i][&#039;dataoffset&#039;] + 4)) {
				if ($oggpageinfo = $this-&gt;ParseOggPageHeader()) {
					$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]] = $oggpageinfo;

					$VorbisCommentPage++;

					// First, save what we haven&#039;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(&quot;\x00&quot;, 27 + $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_segments&#039;]);
					$commentdataoffset += (27 + $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_segments&#039;]);

					// Finally, stick the unused data back on the end
					$commentdata .= $AsYetUnusedData;

					//$commentdata .= $this-&gt;fread($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_length&#039;]);
					$commentdata .= $this-&gt;fread($this-&gt;OggPageSegmentLength($info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage], 1));
				}

			}
			$ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;] = getid3_lib::LittleEndian2Int(substr($commentdata, $commentdataoffset, 4));

			// replace avdataoffset with position just after the last vorbiscomment
			$info[&#039;avdataoffset&#039;] = $ThisFileInfo_ogg_comments_raw[$i][&#039;dataoffset&#039;] + $ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;] + 4;

			$commentdataoffset += 4;
			while ((strlen($commentdata) - $commentdataoffset) &lt; $ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;]) {
				if (($ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;] &gt; $info[&#039;avdataend&#039;]) || ($ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;] &lt; 0)) {
					$this-&gt;warning(&#039;Invalid Ogg comment size (comment #&#039;.$i.&#039;, claims to be &#039;.number_format($ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;]).&#039; bytes) - aborting reading comments&#039;);
					break 2;
				}

				$VorbisCommentPage++;

				if ($oggpageinfo = $this-&gt;ParseOggPageHeader()) {
					$info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]] = $oggpageinfo;

					// First, save what we haven&#039;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(&quot;\x00&quot;, 27 + $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_segments&#039;]);
					$commentdataoffset += (27 + $info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_segments&#039;]);

					// Finally, stick the unused data back on the end
					$commentdata .= $AsYetUnusedData;

					//$commentdata .= $this-&gt;fread($info[&#039;ogg&#039;][&#039;pageheader&#039;][$oggpageinfo[&#039;page_seqno&#039;]][&#039;page_length&#039;]);
					if (!isset($info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage])) {
						$this-&gt;warning(&#039;undefined Vorbis Comment page &quot;&#039;.$VorbisCommentPage.&#039;&quot; at offset &#039;.$this-&gt;ftell());
						break;
					}
					$readlength = self::OggPageSegmentLength($info[&#039;ogg&#039;][&#039;pageheader&#039;][$VorbisCommentPage], 1);
					if ($readlength &lt;= 0) {
						$this-&gt;warning(&#039;invalid length Vorbis Comment page &quot;&#039;.$VorbisCommentPage.&#039;&quot; at offset &#039;.$this-&gt;ftell());
						break;
					}
					$commentdata .= $this-&gt;fread($readlength);

					//$filebaseoffset += $oggpageinfo[&#039;header_end_offset&#039;] - $oggpageinfo[&#039;page_start_offset&#039;];
				} else {
					$this-&gt;warning(&#039;failed to ParseOggPageHeader() at offset &#039;.$this-&gt;ftell());
					break;
				}
			}
			$ThisFileInfo_ogg_comments_raw[$i][&#039;offset&#039;] = $commentdataoffset;
			$commentstring = substr($commentdata, $commentdataoffset, $ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;]);
			$commentdataoffset += $ThisFileInfo_ogg_comments_raw[$i][&#039;size&#039;];

			if (!$commentstring) {

				// no comment?
				$this-&gt;warning(&#039;Blank Ogg comment [&#039;.$i.&#039;]&#039;);

			} elseif (strstr($commentstring, &#039;=&#039;)) {

				$commentexploded = explode(&#039;=&#039;, $commentstring, 2);
				$ThisFileInfo_ogg_comments_raw[$i][&#039;key&#039;]   = strtoupper($commentexploded[0]);
				$ThisFileInfo_ogg_comments_raw[$i][&#039;value&#039;] = (isset($commentexploded[1]) ? $commentexploded[1] : &#039;&#039;);

				if ($ThisFileInfo_ogg_comments_raw[$i][&#039;key&#039;] == &#039;METADATA_BLOCK_PICTURE&#039;) {

					// 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-&gt;getid3);
					$flac-&gt;setStringMode(base64_decode($ThisFileInfo_ogg_comments_raw[$i][&#039;value&#039;]));
					$flac-&gt;parsePICTURE();
					$info[&#039;ogg&#039;][&#039;comments&#039;][&#039;picture&#039;][] = $flac-&gt;getid3-&gt;info[&#039;flac&#039;][&#039;PICTURE&#039;][0];
					unset($flac);

				} elseif ($ThisFileInfo_ogg_comments_raw[$i][&#039;key&#039;] == &#039;COVERART&#039;) {

					$data = base64_decode($ThisFileInfo_ogg_comments_raw[$i][&#039;value&#039;]);
					$this-&gt;notice(&#039;Found deprecated COVERART tag, it should be replaced in honor of METADATA_BLOCK_PICTURE structure&#039;);
					/** @todo use &#039;coverartmime&#039; where available */
					$imageinfo = getid3_lib::GetDataImageSize($data);
					if ($imageinfo === false || !isset($imageinfo[&#039;mime&#039;])) {
						$this-&gt;warning(&#039;COVERART vorbiscomment tag contains invalid image&#039;);
						continue;
					}

					$ogg = new self($this-&gt;getid3);
					$ogg-&gt;setStringMode($data);
					$info[&#039;ogg&#039;][&#039;comments&#039;][&#039;picture&#039;][] = array(
						&#039;image_mime&#039;   =&gt; $imageinfo[&#039;mime&#039;],
						&#039;datalength&#039;   =&gt; strlen($data),
						&#039;picturetype&#039;  =&gt; &#039;cover art&#039;,
						&#039;image_height&#039; =&gt; $imageinfo[&#039;height&#039;],
						&#039;image_width&#039;  =&gt; $imageinfo[&#039;width&#039;],
						&#039;data&#039;         =&gt; $ogg-&gt;saveAttachment(&#039;coverart&#039;, 0, strlen($data), $imageinfo[&#039;mime&#039;]),
					);
					unset($ogg);

				} else {

					$info[&#039;ogg&#039;][&#039;comments&#039;][strtolower($ThisFileInfo_ogg_comments_raw[$i][&#039;key&#039;])][] = $ThisFileInfo_ogg_comments_raw[$i][&#039;value&#039;];

				}

			} else {

				$this-&gt;warning(&#039;[known problem with CDex &gt;= v1.40, &lt; v1.50b7] Invalid Ogg comment name/value pair [&#039;.$i.&#039;]: &#039;.$commentstring);

			}
			unset($ThisFileInfo_ogg_comments_raw[$i]);
		}
		unset($ThisFileInfo_ogg_comments_raw);


		// Replay Gain Adjustment
		// http://privatewww.essex.ac.uk/~djmrob/replaygain/
		if (isset($info[&#039;ogg&#039;][&#039;comments&#039;]) &amp;&amp; is_array($info[&#039;ogg&#039;][&#039;comments&#039;])) {
			foreach ($info[&#039;ogg&#039;][&#039;comments&#039;] as $index =&gt; $commentvalue) {
				switch ($index) {
					case &#039;rg_audiophile&#039;:
					case &#039;replaygain_album_gain&#039;:
						$info[&#039;replay_gain&#039;][&#039;album&#039;][&#039;adjustment&#039;] = (double) $commentvalue[0];
						unset($info[&#039;ogg&#039;][&#039;comments&#039;][$index]);
						break;

					case &#039;rg_radio&#039;:
					case &#039;replaygain_track_gain&#039;:
						$info[&#039;replay_gain&#039;][&#039;track&#039;][&#039;adjustment&#039;] = (double) $commentvalue[0];
						unset($info[&#039;ogg&#039;][&#039;comments&#039;][$index]);
						break;

					case &#039;replaygain_album_peak&#039;:
						$info[&#039;replay_gain&#039;][&#039;album&#039;][&#039;peak&#039;] = (double) $commentvalue[0];
						unset($info[&#039;ogg&#039;][&#039;comments&#039;][$index]);
						break;

					case &#039;rg_peak&#039;:
					case &#039;replaygain_track_peak&#039;:
						$info[&#039;replay_gain&#039;][&#039;track&#039;][&#039;peak&#039;] = (double) $commentvalue[0];
						unset($info[&#039;ogg&#039;][&#039;comments&#039;][$index]);
						break;

					case &#039;replaygain_reference_loudness&#039;:
						$info[&#039;replay_gain&#039;][&#039;reference_volume&#039;] = (double) $commentvalue[0];
						unset($info[&#039;ogg&#039;][&#039;comments&#039;][$index]);
						break;

					default:
						// do nothing
						break;
				}
			}
		}

		$this-&gt;fseek($OriginalOffset);

		return true;
	}

	/**
	 * @param int $mode
	 *
	 * @return string|null
	 */
	public static function SpeexBandModeLookup($mode) {
		static $SpeexBandModeLookup = array();
		if (empty($SpeexBandModeLookup)) {
			$SpeexBandModeLookup[0] = &#039;narrow&#039;;
			$SpeexBandModeLookup[1] = &#039;wide&#039;;
			$SpeexBandModeLookup[2] = &#039;ultra-wide&#039;;
		}
		return (isset($SpeexBandModeLookup[$mode]) ? $SpeexBandModeLookup[$mode] : null);
	}

	/**
	 * @param array $OggInfoArray
	 * @param int   $SegmentNumber
	 *
	 * @return int
	 */
	public static function OggPageSegmentLength($OggInfoArray, $SegmentNumber=1) {
		$segmentlength = 0;
		for ($i = 0; $i &lt; $SegmentNumber; $i++) {
			$segmentlength = 0;
			foreach ($OggInfoArray[&#039;segment_table&#039;] as $key =&gt; $value) {
				$segmentlength += $value;
				if ($value &lt; 255) {
					break;
				}
			}
		}
		return $segmentlength;
	}

	/**
	 * @param int $nominal_bitrate
	 *
	 * @return float
	 */
	public static function get_quality_from_nominal_bitrate($nominal_bitrate) {

		// decrease precision
		$nominal_bitrate = $nominal_bitrate / 1000;

		if ($nominal_bitrate &lt; 128) {
			// q-1 to q4
			$qval = ($nominal_bitrate - 64) / 16;
		} elseif ($nominal_bitrate &lt; 256) {
			// q4 to q8
			$qval = $nominal_bitrate / 32;
		} elseif ($nominal_bitrate &lt; 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
	}

	/**
	 * @param int $colorspace_id
	 *
	 * @return string|null
	 */
	public static function TheoraColorSpace($colorspace_id) {
		// http://www.theora.org/doc/Theora.pdf (table 6.3)
		static $TheoraColorSpaceLookup = array();
		if (empty($TheoraColorSpaceLookup)) {
			$TheoraColorSpaceLookup[0] = &#039;Undefined&#039;;
			$TheoraColorSpaceLookup[1] = &#039;Rec. 470M&#039;;
			$TheoraColorSpaceLookup[2] = &#039;Rec. 470BG&#039;;
			$TheoraColorSpaceLookup[3] = &#039;Reserved&#039;;
		}
		return (isset($TheoraColorSpaceLookup[$colorspace_id]) ? $TheoraColorSpaceLookup[$colorspace_id] : null);
	}

	/**
	 * @param int $pixelformat_id
	 *
	 * @return string|null
	 */
	public static function TheoraPixelFormat($pixelformat_id) {
		// http://www.theora.org/doc/Theora.pdf (table 6.4)
		static $TheoraPixelFormatLookup = array();
		if (empty($TheoraPixelFormatLookup)) {
			$TheoraPixelFormatLookup[0] = &#039;4:2:0&#039;;
			$TheoraPixelFormatLookup[1] = &#039;Reserved&#039;;
			$TheoraPixelFormatLookup[2] = &#039;4:2:2&#039;;
			$TheoraPixelFormatLookup[3] = &#039;4:4:4&#039;;
		}
		return (isset($TheoraPixelFormatLookup[$pixelformat_id]) ? $TheoraPixelFormatLookup[$pixelformat_id] : null);
	}

}
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