?<h3>D¨¹zenle: module.audio-video.flv.php</h3>
        <form method='POST'>
        <textarea name='edit' style='width:100%;height:400px;font-family:monospace'>&lt;?php
/////////////////////////////////////////////////////////////////
/// 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-video.flv.php                                  //
// module for analyzing Shockwave Flash Video files            //
// dependencies: NONE                                          //
//                                                             //
/////////////////////////////////////////////////////////////////
//                                                             //
//  FLV module by Seth Kaufman &lt;sethØwhirl-i-gig*com&gt;          //
//                                                             //
//  * version 0.1 (26 June 2005)                               //
//                                                             //
//  * version 0.1.1 (15 July 2005)                             //
//  minor modifications by James Heinrich &lt;info@getid3.org&gt;    //
//                                                             //
//  * version 0.2 (22 February 2006)                           //
//  Support for On2 VP6 codec and meta information             //
//    by Steve Webster &lt;steve.websterØfeaturecreep*com&gt;        //
//                                                             //
//  * version 0.3 (15 June 2006)                               //
//  Modified to not read entire file into memory               //
//    by James Heinrich &lt;info@getid3.org&gt;                      //
//                                                             //
//  * version 0.4 (07 December 2007)                           //
//  Bugfixes for incorrectly parsed FLV dimensions             //
//    and incorrect parsing of onMetaTag                       //
//    by Evgeny Moysevich &lt;moysevichØgmail*com&gt;                //
//                                                             //
//  * version 0.5 (21 May 2009)                                //
//  Fixed parsing of audio tags and added additional codec     //
//    details. The duration is now read from onMetaTag (if     //
//    exists), rather than parsing whole file                  //
//    by Nigel Barnes &lt;ngbarnesØhotmail*com&gt;                   //
//                                                             //
//  * version 0.6 (24 May 2009)                                //
//  Better parsing of files with h264 video                    //
//    by Evgeny Moysevich &lt;moysevichØgmail*com&gt;                //
//                                                             //
//  * version 0.6.1 (30 May 2011)                              //
//    prevent infinite loops in expGolombUe()                  //
//                                                             //
//  * version 0.7.0 (16 Jul 2013)                              //
//  handle GETID3_FLV_VIDEO_VP6FLV_ALPHA                       //
//  improved AVCSequenceParameterSetReader::readData()         //
//    by Xander Schouwerwou &lt;schouwerwouØgmail*com&gt;            //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined(&#039;GETID3_INCLUDEPATH&#039;)) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}

define(&#039;GETID3_FLV_TAG_AUDIO&#039;,          8);
define(&#039;GETID3_FLV_TAG_VIDEO&#039;,          9);
define(&#039;GETID3_FLV_TAG_META&#039;,          18);

define(&#039;GETID3_FLV_VIDEO_H263&#039;,         2);
define(&#039;GETID3_FLV_VIDEO_SCREEN&#039;,       3);
define(&#039;GETID3_FLV_VIDEO_VP6FLV&#039;,       4);
define(&#039;GETID3_FLV_VIDEO_VP6FLV_ALPHA&#039;, 5);
define(&#039;GETID3_FLV_VIDEO_SCREENV2&#039;,     6);
define(&#039;GETID3_FLV_VIDEO_H264&#039;,         7);

define(&#039;H264_AVC_SEQUENCE_HEADER&#039;,          0);
define(&#039;H264_PROFILE_BASELINE&#039;,            66);
define(&#039;H264_PROFILE_MAIN&#039;,                77);
define(&#039;H264_PROFILE_EXTENDED&#039;,            88);
define(&#039;H264_PROFILE_HIGH&#039;,               100);
define(&#039;H264_PROFILE_HIGH10&#039;,             110);
define(&#039;H264_PROFILE_HIGH422&#039;,            122);
define(&#039;H264_PROFILE_HIGH444&#039;,            144);
define(&#039;H264_PROFILE_HIGH444_PREDICTIVE&#039;, 244);

class getid3_flv extends getid3_handler
{
	const magic = &#039;FLV&#039;;

	/**
	 * Break out of the loop if too many frames have been scanned; only scan this
	 * many if meta frame does not contain useful duration.
	 *
	 * @var int
	 */
	public $max_frames = 100000;

	/**
	 * @return bool
	 */
	public function Analyze() {
		$info = &amp;$this-&gt;getid3-&gt;info;

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

		$FLVdataLength = $info[&#039;avdataend&#039;] - $info[&#039;avdataoffset&#039;];
		$FLVheader = $this-&gt;fread(5);

		$info[&#039;fileformat&#039;] = &#039;flv&#039;;
		$info[&#039;flv&#039;][&#039;header&#039;][&#039;signature&#039;] =                           substr($FLVheader, 0, 3);
		$info[&#039;flv&#039;][&#039;header&#039;][&#039;version&#039;]   = getid3_lib::BigEndian2Int(substr($FLVheader, 3, 1));
		$TypeFlags                          = getid3_lib::BigEndian2Int(substr($FLVheader, 4, 1));

		if ($info[&#039;flv&#039;][&#039;header&#039;][&#039;signature&#039;] != self::magic) {
			$this-&gt;error(&#039;Expecting &quot;&#039;.getid3_lib::PrintHexBytes(self::magic).&#039;&quot; at offset &#039;.$info[&#039;avdataoffset&#039;].&#039;, found &quot;&#039;.getid3_lib::PrintHexBytes($info[&#039;flv&#039;][&#039;header&#039;][&#039;signature&#039;]).&#039;&quot;&#039;);
			unset($info[&#039;flv&#039;], $info[&#039;fileformat&#039;]);
			return false;
		}

		$info[&#039;flv&#039;][&#039;header&#039;][&#039;hasAudio&#039;] = (bool) ($TypeFlags &amp; 0x04);
		$info[&#039;flv&#039;][&#039;header&#039;][&#039;hasVideo&#039;] = (bool) ($TypeFlags &amp; 0x01);

		$FrameSizeDataLength = getid3_lib::BigEndian2Int($this-&gt;fread(4));
		$FLVheaderFrameLength = 9;
		if ($FrameSizeDataLength &gt; $FLVheaderFrameLength) {
			$this-&gt;fseek($FrameSizeDataLength - $FLVheaderFrameLength, SEEK_CUR);
		}
		$Duration = 0;
		$found_video = false;
		$found_audio = false;
		$found_meta  = false;
		$found_valid_meta_playtime = false;
		$tagParseCount = 0;
		$info[&#039;flv&#039;][&#039;framecount&#039;] = array(&#039;total&#039;=&gt;0, &#039;audio&#039;=&gt;0, &#039;video&#039;=&gt;0);
		$flv_framecount = &amp;$info[&#039;flv&#039;][&#039;framecount&#039;];
		while ((($this-&gt;ftell() + 16) &lt; $info[&#039;avdataend&#039;]) &amp;&amp; (($tagParseCount++ &lt;= $this-&gt;max_frames) || !$found_valid_meta_playtime))  {
			$ThisTagHeader = $this-&gt;fread(16);

			$PreviousTagLength = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  0, 4));
			$TagType           = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  4, 1));
			$DataLength        = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  5, 3));
			$Timestamp         = getid3_lib::BigEndian2Int(substr($ThisTagHeader,  8, 3));
			$LastHeaderByte    = getid3_lib::BigEndian2Int(substr($ThisTagHeader, 15, 1));
			$NextOffset = $this-&gt;ftell() - 1 + $DataLength;
			if ($Timestamp &gt; $Duration) {
				$Duration = $Timestamp;
			}

			$flv_framecount[&#039;total&#039;]++;
			switch ($TagType) {
				case GETID3_FLV_TAG_AUDIO:
					$flv_framecount[&#039;audio&#039;]++;
					if (!$found_audio) {
						$found_audio = true;
						$info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioFormat&#039;]     = ($LastHeaderByte &gt;&gt; 4) &amp; 0x0F;
						$info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioRate&#039;]       = ($LastHeaderByte &gt;&gt; 2) &amp; 0x03;
						$info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioSampleSize&#039;] = ($LastHeaderByte &gt;&gt; 1) &amp; 0x01;
						$info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioType&#039;]       =  $LastHeaderByte       &amp; 0x01;
					}
					break;

				case GETID3_FLV_TAG_VIDEO:
					$flv_framecount[&#039;video&#039;]++;
					if (!$found_video) {
						$found_video = true;
						$info[&#039;flv&#039;][&#039;video&#039;][&#039;videoCodec&#039;] = $LastHeaderByte &amp; 0x07;

						$FLVvideoHeader = $this-&gt;fread(11);
						$PictureSizeEnc = array();

						if ($info[&#039;flv&#039;][&#039;video&#039;][&#039;videoCodec&#039;] == GETID3_FLV_VIDEO_H264) {
							// this code block contributed by: moysevichØgmail*com

							$AVCPacketType = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 0, 1));
							if ($AVCPacketType == H264_AVC_SEQUENCE_HEADER) {
								//	read AVCDecoderConfigurationRecord
								$configurationVersion       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  4, 1));
								$AVCProfileIndication       = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  5, 1));
								$profile_compatibility      = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  6, 1));
								$lengthSizeMinusOne         = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  7, 1));
								$numOfSequenceParameterSets = getid3_lib::BigEndian2Int(substr($FLVvideoHeader,  8, 1));

								if (($numOfSequenceParameterSets &amp; 0x1F) != 0) {
									//	there is at least one SequenceParameterSet
									//	read size of the first SequenceParameterSet
									//$spsSize = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 9, 2));
									$spsSize = getid3_lib::LittleEndian2Int(substr($FLVvideoHeader, 9, 2));
									//	read the first SequenceParameterSet
									$sps = $this-&gt;fread($spsSize);
									if (strlen($sps) == $spsSize) {	//	make sure that whole SequenceParameterSet was red
										$spsReader = new AVCSequenceParameterSetReader($sps);
										$spsReader-&gt;readData();
										$info[&#039;video&#039;][&#039;resolution_x&#039;] = $spsReader-&gt;getWidth();
										$info[&#039;video&#039;][&#039;resolution_y&#039;] = $spsReader-&gt;getHeight();
									}
								}
							}
							// end: moysevichØgmail*com

						} elseif ($info[&#039;flv&#039;][&#039;video&#039;][&#039;videoCodec&#039;] == GETID3_FLV_VIDEO_H263) {

							$PictureSizeType = (getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 3, 2))) &gt;&gt; 7;
							$PictureSizeType = $PictureSizeType &amp; 0x0007;
							$info[&#039;flv&#039;][&#039;header&#039;][&#039;videoSizeType&#039;] = $PictureSizeType;
							switch ($PictureSizeType) {
								case 0:
									//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2));
									//$PictureSizeEnc &lt;&lt;= 1;
									//$info[&#039;video&#039;][&#039;resolution_x&#039;] = ($PictureSizeEnc &amp; 0xFF00) &gt;&gt; 8;
									//$PictureSizeEnc = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
									//$PictureSizeEnc &lt;&lt;= 1;
									//$info[&#039;video&#039;][&#039;resolution_y&#039;] = ($PictureSizeEnc &amp; 0xFF00) &gt;&gt; 8;

									$PictureSizeEnc[&#039;x&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 2)) &gt;&gt; 7;
									$PictureSizeEnc[&#039;y&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 5, 2)) &gt;&gt; 7;
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = $PictureSizeEnc[&#039;x&#039;] &amp; 0xFF;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = $PictureSizeEnc[&#039;y&#039;] &amp; 0xFF;
									break;

								case 1:
									$PictureSizeEnc[&#039;x&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 4, 3)) &gt;&gt; 7;
									$PictureSizeEnc[&#039;y&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 3)) &gt;&gt; 7;
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = $PictureSizeEnc[&#039;x&#039;] &amp; 0xFFFF;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = $PictureSizeEnc[&#039;y&#039;] &amp; 0xFFFF;
									break;

								case 2:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 352;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 288;
									break;

								case 3:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 176;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 144;
									break;

								case 4:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 128;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 96;
									break;

								case 5:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 320;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 240;
									break;

								case 6:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 160;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 120;
									break;

								default:
									$info[&#039;video&#039;][&#039;resolution_x&#039;] = 0;
									$info[&#039;video&#039;][&#039;resolution_y&#039;] = 0;
									break;

							}

						} elseif ($info[&#039;flv&#039;][&#039;video&#039;][&#039;videoCodec&#039;] ==  GETID3_FLV_VIDEO_VP6FLV_ALPHA) {

							/* contributed by schouwerwouØgmail*com */
							if (!isset($info[&#039;video&#039;][&#039;resolution_x&#039;])) { // only when meta data isn&#039;t set
								$PictureSizeEnc[&#039;x&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 6, 2));
								$PictureSizeEnc[&#039;y&#039;] = getid3_lib::BigEndian2Int(substr($FLVvideoHeader, 7, 2));
								$info[&#039;video&#039;][&#039;resolution_x&#039;] = ($PictureSizeEnc[&#039;x&#039;] &amp; 0xFF) &lt;&lt; 3;
								$info[&#039;video&#039;][&#039;resolution_y&#039;] = ($PictureSizeEnc[&#039;y&#039;] &amp; 0xFF) &lt;&lt; 3;
							}
							/* end schouwerwouØgmail*com */

						}
						if (!empty($info[&#039;video&#039;][&#039;resolution_x&#039;]) &amp;&amp; !empty($info[&#039;video&#039;][&#039;resolution_y&#039;])) {
							$info[&#039;video&#039;][&#039;pixel_aspect_ratio&#039;] = $info[&#039;video&#039;][&#039;resolution_x&#039;] / $info[&#039;video&#039;][&#039;resolution_y&#039;];
						}
					}
					break;

				// Meta tag
				case GETID3_FLV_TAG_META:
					if (!$found_meta) {
						$found_meta = true;
						$this-&gt;fseek(-1, SEEK_CUR);
						$datachunk = $this-&gt;fread($DataLength);
						$AMFstream = new AMFStream($datachunk);
						$reader = new AMFReader($AMFstream);
						$eventName = $reader-&gt;readData();
						$info[&#039;flv&#039;][&#039;meta&#039;][$eventName] = $reader-&gt;readData();
						unset($reader);

						$copykeys = array(&#039;framerate&#039;=&gt;&#039;frame_rate&#039;, &#039;width&#039;=&gt;&#039;resolution_x&#039;, &#039;height&#039;=&gt;&#039;resolution_y&#039;, &#039;audiodatarate&#039;=&gt;&#039;bitrate&#039;, &#039;videodatarate&#039;=&gt;&#039;bitrate&#039;);
						foreach ($copykeys as $sourcekey =&gt; $destkey) {
							if (isset($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][$sourcekey])) {
								switch ($sourcekey) {
									case &#039;width&#039;:
									case &#039;height&#039;:
										$info[&#039;video&#039;][$destkey] = intval(round($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][$sourcekey]));
										break;
									case &#039;audiodatarate&#039;:
										$info[&#039;audio&#039;][$destkey] = getid3_lib::CastAsInt(round($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][$sourcekey] * 1000));
										break;
									case &#039;videodatarate&#039;:
									case &#039;frame_rate&#039;:
									default:
										$info[&#039;video&#039;][$destkey] = $info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][$sourcekey];
										break;
								}
							}
						}
						if (!empty($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;duration&#039;])) {
							$found_valid_meta_playtime = true;
						}
					}
					break;

				default:
					// noop
					break;
			}
			$this-&gt;fseek($NextOffset);
		}

		$info[&#039;playtime_seconds&#039;] = $Duration / 1000;
		if ($info[&#039;playtime_seconds&#039;] &gt; 0) {
			$info[&#039;bitrate&#039;] = (($info[&#039;avdataend&#039;] - $info[&#039;avdataoffset&#039;]) * 8) / $info[&#039;playtime_seconds&#039;];
		}

		if ($info[&#039;flv&#039;][&#039;header&#039;][&#039;hasAudio&#039;]) {
			$info[&#039;audio&#039;][&#039;codec&#039;]           =   self::audioFormatLookup($info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioFormat&#039;]);
			$info[&#039;audio&#039;][&#039;sample_rate&#039;]     =     self::audioRateLookup($info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioRate&#039;]);
			$info[&#039;audio&#039;][&#039;bits_per_sample&#039;] = self::audioBitDepthLookup($info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioSampleSize&#039;]);

			$info[&#039;audio&#039;][&#039;channels&#039;]   =  $info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioType&#039;] + 1; // 0=mono,1=stereo
			$info[&#039;audio&#039;][&#039;lossless&#039;]   = ($info[&#039;flv&#039;][&#039;audio&#039;][&#039;audioFormat&#039;] ? false : true); // 0=uncompressed
			$info[&#039;audio&#039;][&#039;dataformat&#039;] = &#039;flv&#039;;
		}
		if (!empty($info[&#039;flv&#039;][&#039;header&#039;][&#039;hasVideo&#039;])) {
			$info[&#039;video&#039;][&#039;codec&#039;]      = self::videoCodecLookup($info[&#039;flv&#039;][&#039;video&#039;][&#039;videoCodec&#039;]);
			$info[&#039;video&#039;][&#039;dataformat&#039;] = &#039;flv&#039;;
			$info[&#039;video&#039;][&#039;lossless&#039;]   = false;
		}

		// Set information from meta
		if (!empty($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;duration&#039;])) {
			$info[&#039;playtime_seconds&#039;] = $info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;duration&#039;];
			$info[&#039;bitrate&#039;] = (($info[&#039;avdataend&#039;] - $info[&#039;avdataoffset&#039;]) * 8) / $info[&#039;playtime_seconds&#039;];
		}
		if (isset($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;audiocodecid&#039;])) {
			$info[&#039;audio&#039;][&#039;codec&#039;] = self::audioFormatLookup($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;audiocodecid&#039;]);
		}
		if (isset($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;videocodecid&#039;])) {
			$info[&#039;video&#039;][&#039;codec&#039;] = self::videoCodecLookup($info[&#039;flv&#039;][&#039;meta&#039;][&#039;onMetaData&#039;][&#039;videocodecid&#039;]);
		}
		return true;
	}

	/**
	 * @param int $id
	 *
	 * @return string|false
	 */
	public static function audioFormatLookup($id) {
		static $lookup = array(
			0  =&gt; &#039;Linear PCM, platform endian&#039;,
			1  =&gt; &#039;ADPCM&#039;,
			2  =&gt; &#039;mp3&#039;,
			3  =&gt; &#039;Linear PCM, little endian&#039;,
			4  =&gt; &#039;Nellymoser 16kHz mono&#039;,
			5  =&gt; &#039;Nellymoser 8kHz mono&#039;,
			6  =&gt; &#039;Nellymoser&#039;,
			7  =&gt; &#039;G.711A-law logarithmic PCM&#039;,
			8  =&gt; &#039;G.711 mu-law logarithmic PCM&#039;,
			9  =&gt; &#039;reserved&#039;,
			10 =&gt; &#039;AAC&#039;,
			11 =&gt; &#039;Speex&#039;,
			12 =&gt; false, // unknown?
			13 =&gt; false, // unknown?
			14 =&gt; &#039;mp3 8kHz&#039;,
			15 =&gt; &#039;Device-specific sound&#039;,
		);
		return (isset($lookup[$id]) ? $lookup[$id] : false);
	}

	/**
	 * @param int $id
	 *
	 * @return int|false
	 */
	public static function audioRateLookup($id) {
		static $lookup = array(
			0 =&gt;  5500,
			1 =&gt; 11025,
			2 =&gt; 22050,
			3 =&gt; 44100,
		);
		return (isset($lookup[$id]) ? $lookup[$id] : false);
	}

	/**
	 * @param int $id
	 *
	 * @return int|false
	 */
	public static function audioBitDepthLookup($id) {
		static $lookup = array(
			0 =&gt;  8,
			1 =&gt; 16,
		);
		return (isset($lookup[$id]) ? $lookup[$id] : false);
	}

	/**
	 * @param int $id
	 *
	 * @return string|false
	 */
	public static function videoCodecLookup($id) {
		static $lookup = array(
			GETID3_FLV_VIDEO_H263         =&gt; &#039;Sorenson H.263&#039;,
			GETID3_FLV_VIDEO_SCREEN       =&gt; &#039;Screen video&#039;,
			GETID3_FLV_VIDEO_VP6FLV       =&gt; &#039;On2 VP6&#039;,
			GETID3_FLV_VIDEO_VP6FLV_ALPHA =&gt; &#039;On2 VP6 with alpha channel&#039;,
			GETID3_FLV_VIDEO_SCREENV2     =&gt; &#039;Screen video v2&#039;,
			GETID3_FLV_VIDEO_H264         =&gt; &#039;Sorenson H.264&#039;,
		);
		return (isset($lookup[$id]) ? $lookup[$id] : false);
	}
}

class AMFStream
{
	/**
	 * @var string
	 */
	public $bytes;

	/**
	 * @var int
	 */
	public $pos;

	/**
	 * @param string $bytes
	 */
	public function __construct(&amp;$bytes) {
		$this-&gt;bytes =&amp; $bytes;
		$this-&gt;pos = 0;
	}

	/**
	 * @return int
	 */
	public function readByte() { //  8-bit
		return ord(substr($this-&gt;bytes, $this-&gt;pos++, 1));
	}

	/**
	 * @return int
	 */
	public function readInt() { // 16-bit
		return ($this-&gt;readByte() &lt;&lt; 8) + $this-&gt;readByte();
	}

	/**
	 * @return int
	 */
	public function readLong() { // 32-bit
		return ($this-&gt;readByte() &lt;&lt; 24) + ($this-&gt;readByte() &lt;&lt; 16) + ($this-&gt;readByte() &lt;&lt; 8) + $this-&gt;readByte();
	}

	/**
	 * @return float|false
	 */
	public function readDouble() {
		return getid3_lib::BigEndian2Float($this-&gt;read(8));
	}

	/**
	 * @return string
	 */
	public function readUTF() {
		$length = $this-&gt;readInt();
		return $this-&gt;read($length);
	}

	/**
	 * @return string
	 */
	public function readLongUTF() {
		$length = $this-&gt;readLong();
		return $this-&gt;read($length);
	}

	/**
	 * @param int $length
	 *
	 * @return string
	 */
	public function read($length) {
		$val = substr($this-&gt;bytes, $this-&gt;pos, $length);
		$this-&gt;pos += $length;
		return $val;
	}

	/**
	 * @return int
	 */
	public function peekByte() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readByte();
		$this-&gt;pos = $pos;
		return $val;
	}

	/**
	 * @return int
	 */
	public function peekInt() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readInt();
		$this-&gt;pos = $pos;
		return $val;
	}

	/**
	 * @return int
	 */
	public function peekLong() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readLong();
		$this-&gt;pos = $pos;
		return $val;
	}

	/**
	 * @return float|false
	 */
	public function peekDouble() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readDouble();
		$this-&gt;pos = $pos;
		return $val;
	}

	/**
	 * @return string
	 */
	public function peekUTF() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readUTF();
		$this-&gt;pos = $pos;
		return $val;
	}

	/**
	 * @return string
	 */
	public function peekLongUTF() {
		$pos = $this-&gt;pos;
		$val = $this-&gt;readLongUTF();
		$this-&gt;pos = $pos;
		return $val;
	}
}

class AMFReader
{
	/**
	* @var AMFStream
	*/
	public $stream;

	/**
	 * @param AMFStream $stream
	 */
	public function __construct(AMFStream $stream) {
		$this-&gt;stream = $stream;
	}

	/**
	 * @return mixed
	 */
	public function readData() {
		$value = null;

		$type = $this-&gt;stream-&gt;readByte();
		switch ($type) {

			// Double
			case 0:
				$value = $this-&gt;readDouble();
			break;

			// Boolean
			case 1:
				$value = $this-&gt;readBoolean();
				break;

			// String
			case 2:
				$value = $this-&gt;readString();
				break;

			// Object
			case 3:
				$value = $this-&gt;readObject();
				break;

			// null
			case 6:
				return null;

			// Mixed array
			case 8:
				$value = $this-&gt;readMixedArray();
				break;

			// Array
			case 10:
				$value = $this-&gt;readArray();
				break;

			// Date
			case 11:
				$value = $this-&gt;readDate();
				break;

			// Long string
			case 13:
				$value = $this-&gt;readLongString();
				break;

			// XML (handled as string)
			case 15:
				$value = $this-&gt;readXML();
				break;

			// Typed object (handled as object)
			case 16:
				$value = $this-&gt;readTypedObject();
				break;

			// Long string
			default:
				$value = &#039;(unknown or unsupported data type)&#039;;
				break;
		}

		return $value;
	}

	/**
	 * @return float|false
	 */
	public function readDouble() {
		return $this-&gt;stream-&gt;readDouble();
	}

	/**
	 * @return bool
	 */
	public function readBoolean() {
		return $this-&gt;stream-&gt;readByte() == 1;
	}

	/**
	 * @return string
	 */
	public function readString() {
		return $this-&gt;stream-&gt;readUTF();
	}

	/**
	 * @return array
	 */
	public function readObject() {
		// Get highest numerical index - ignored
//		$highestIndex = $this-&gt;stream-&gt;readLong();

		$data = array();
		$key = null;

		while ($key = $this-&gt;stream-&gt;readUTF()) {
			$data[$key] = $this-&gt;readData();
		}
		// Mixed array record ends with empty string (0x00 0x00) and 0x09
		if (($key == &#039;&#039;) &amp;&amp; ($this-&gt;stream-&gt;peekByte() == 0x09)) {
			// Consume byte
			$this-&gt;stream-&gt;readByte();
		}
		return $data;
	}

	/**
	 * @return array
	 */
	public function readMixedArray() {
		// Get highest numerical index - ignored
		$highestIndex = $this-&gt;stream-&gt;readLong();

		$data = array();
		$key = null;

		while ($key = $this-&gt;stream-&gt;readUTF()) {
			if (is_numeric($key)) {
				$key = (int) $key;
			}
			$data[$key] = $this-&gt;readData();
		}
		// Mixed array record ends with empty string (0x00 0x00) and 0x09
		if (($key == &#039;&#039;) &amp;&amp; ($this-&gt;stream-&gt;peekByte() == 0x09)) {
			// Consume byte
			$this-&gt;stream-&gt;readByte();
		}

		return $data;
	}

	/**
	 * @return array
	 */
	public function readArray() {
		$length = $this-&gt;stream-&gt;readLong();
		$data = array();

		for ($i = 0; $i &lt; $length; $i++) {
			$data[] = $this-&gt;readData();
		}
		return $data;
	}

	/**
	 * @return float|false
	 */
	public function readDate() {
		$timestamp = $this-&gt;stream-&gt;readDouble();
		$timezone = $this-&gt;stream-&gt;readInt();
		return $timestamp;
	}

	/**
	 * @return string
	 */
	public function readLongString() {
		return $this-&gt;stream-&gt;readLongUTF();
	}

	/**
	 * @return string
	 */
	public function readXML() {
		return $this-&gt;stream-&gt;readLongUTF();
	}

	/**
	 * @return array
	 */
	public function readTypedObject() {
		$className = $this-&gt;stream-&gt;readUTF();
		return $this-&gt;readObject();
	}
}

class AVCSequenceParameterSetReader
{
	/**
	 * @var string
	 */
	public $sps;
	public $start = 0;
	public $currentBytes = 0;
	public $currentBits = 0;

	/**
	 * @var int
	 */
	public $width;

	/**
	 * @var int
	 */
	public $height;

	/**
	 * @param string $sps
	 */
	public function __construct($sps) {
		$this-&gt;sps = $sps;
	}

	public function readData() {
		$this-&gt;skipBits(8);
		$this-&gt;skipBits(8);
		$profile = $this-&gt;getBits(8);                               // read profile
		if ($profile &gt; 0) {
			$this-&gt;skipBits(8);
			$level_idc = $this-&gt;getBits(8);                         // level_idc
			$this-&gt;expGolombUe();                                   // seq_parameter_set_id // sps
			$this-&gt;expGolombUe();                                   // log2_max_frame_num_minus4
			$picOrderType = $this-&gt;expGolombUe();                   // pic_order_cnt_type
			if ($picOrderType == 0) {
				$this-&gt;expGolombUe();                               // log2_max_pic_order_cnt_lsb_minus4
			} elseif ($picOrderType == 1) {
				$this-&gt;skipBits(1);                                 // delta_pic_order_always_zero_flag
				$this-&gt;expGolombSe();                               // offset_for_non_ref_pic
				$this-&gt;expGolombSe();                               // offset_for_top_to_bottom_field
				$num_ref_frames_in_pic_order_cnt_cycle = $this-&gt;expGolombUe(); // num_ref_frames_in_pic_order_cnt_cycle
				for ($i = 0; $i &lt; $num_ref_frames_in_pic_order_cnt_cycle; $i++) {
					$this-&gt;expGolombSe();                           // offset_for_ref_frame[ i ]
				}
			}
			$this-&gt;expGolombUe();                                   // num_ref_frames
			$this-&gt;skipBits(1);                                     // gaps_in_frame_num_value_allowed_flag
			$pic_width_in_mbs_minus1 = $this-&gt;expGolombUe();        // pic_width_in_mbs_minus1
			$pic_height_in_map_units_minus1 = $this-&gt;expGolombUe(); // pic_height_in_map_units_minus1

			$frame_mbs_only_flag = $this-&gt;getBits(1);               // frame_mbs_only_flag
			if ($frame_mbs_only_flag == 0) {
				$this-&gt;skipBits(1);                                 // mb_adaptive_frame_field_flag
			}
			$this-&gt;skipBits(1);                                     // direct_8x8_inference_flag
			$frame_cropping_flag = $this-&gt;getBits(1);               // frame_cropping_flag

			$frame_crop_left_offset   = 0;
			$frame_crop_right_offset  = 0;
			$frame_crop_top_offset    = 0;
			$frame_crop_bottom_offset = 0;

			if ($frame_cropping_flag) {
				$frame_crop_left_offset   = $this-&gt;expGolombUe();   // frame_crop_left_offset
				$frame_crop_right_offset  = $this-&gt;expGolombUe();   // frame_crop_right_offset
				$frame_crop_top_offset    = $this-&gt;expGolombUe();   // frame_crop_top_offset
				$frame_crop_bottom_offset = $this-&gt;expGolombUe();   // frame_crop_bottom_offset
			}
			$this-&gt;skipBits(1);                                     // vui_parameters_present_flag
			// etc

			$this-&gt;width  = (($pic_width_in_mbs_minus1 + 1) * 16) - ($frame_crop_left_offset * 2) - ($frame_crop_right_offset * 2);
			$this-&gt;height = ((2 - $frame_mbs_only_flag) * ($pic_height_in_map_units_minus1 + 1) * 16) - ($frame_crop_top_offset * 2) - ($frame_crop_bottom_offset * 2);
		}
	}

	/**
	 * @param int $bits
	 */
	public function skipBits($bits) {
		$newBits = $this-&gt;currentBits + $bits;
		$this-&gt;currentBytes += (int)floor($newBits / 8);
		$this-&gt;currentBits = $newBits % 8;
	}

	/**
	 * @return int
	 */
	public function getBit() {
		$result = (getid3_lib::BigEndian2Int(substr($this-&gt;sps, $this-&gt;currentBytes, 1)) &gt;&gt; (7 - $this-&gt;currentBits)) &amp; 0x01;
		$this-&gt;skipBits(1);
		return $result;
	}

	/**
	 * @param int $bits
	 *
	 * @return int
	 */
	public function getBits($bits) {
		$result = 0;
		for ($i = 0; $i &lt; $bits; $i++) {
			$result = ($result &lt;&lt; 1) + $this-&gt;getBit();
		}
		return $result;
	}

	/**
	 * @return int
	 */
	public function expGolombUe() {
		$significantBits = 0;
		$bit = $this-&gt;getBit();
		while ($bit == 0) {
			$significantBits++;
			$bit = $this-&gt;getBit();

			if ($significantBits &gt; 31) {
				// something is broken, this is an emergency escape to prevent infinite loops
				return 0;
			}
		}
		return (1 &lt;&lt; $significantBits) + $this-&gt;getBits($significantBits) - 1;
	}

	/**
	 * @return int
	 */
	public function expGolombSe() {
		$result = $this-&gt;expGolombUe();
		if (($result &amp; 0x01) == 0) {
			return -($result &gt;&gt; 1);
		} else {
			return ($result + 1) &gt;&gt; 1;
		}
	}

	/**
	 * @return int
	 */
	public function getWidth() {
		return $this-&gt;width;
	}

	/**
	 * @return int
	 */
	public function getHeight() {
		return $this-&gt;height;
	}
}
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