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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.ac3.php                                        //
// module for analyzing AC-3 (aka Dolby Digital) audio files   //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

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

class getid3_ac3 extends getid3_handler
{
	/**
	 * @var array
	 */
	private $AC3header = array();

	/**
	 * @var int
	 */
	private $BSIoffset = 0;

	const syncword = 0x0B77;

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

		///AH
		$info[&#039;ac3&#039;][&#039;raw&#039;][&#039;bsi&#039;] = array();
		$thisfile_ac3              = &amp;$info[&#039;ac3&#039;];
		$thisfile_ac3_raw          = &amp;$thisfile_ac3[&#039;raw&#039;];
		$thisfile_ac3_raw_bsi      = &amp;$thisfile_ac3_raw[&#039;bsi&#039;];


		// http://www.atsc.org/standards/a_52a.pdf

		$info[&#039;fileformat&#039;] = &#039;ac3&#039;;

		// An AC-3 serial coded audio bit stream is made up of a sequence of synchronization frames
		// Each synchronization frame contains 6 coded audio blocks (AB), each of which represent 256
		// new audio samples per channel. A synchronization information (SI) header at the beginning
		// of each frame contains information needed to acquire and maintain synchronization. A
		// bit stream information (BSI) header follows SI, and contains parameters describing the coded
		// audio service. The coded audio blocks may be followed by an auxiliary data (Aux) field. At the
		// end of each frame is an error check field that includes a CRC word for error detection. An
		// additional CRC word is located in the SI header, the use of which, by a decoder, is optional.
		//
		// syncinfo() | bsi() | AB0 | AB1 | AB2 | AB3 | AB4 | AB5 | Aux | CRC

		// syncinfo() {
		// 	 syncword    16
		// 	 crc1        16
		// 	 fscod        2
		// 	 frmsizecod   6
		// } /* end of syncinfo */

		$this-&gt;fseek($info[&#039;avdataoffset&#039;]);
		$tempAC3header = $this-&gt;fread(100); // should be enough to cover all data, there are some variable-length fields...?
		$this-&gt;AC3header[&#039;syncinfo&#039;]  =     getid3_lib::BigEndian2Int(substr($tempAC3header, 0, 2));
		$this-&gt;AC3header[&#039;bsi&#039;]       =     getid3_lib::BigEndian2Bin(substr($tempAC3header, 2));
		$thisfile_ac3_raw_bsi[&#039;bsid&#039;] = (getid3_lib::LittleEndian2Int(substr($tempAC3header, 5, 1)) &amp; 0xF8) &gt;&gt; 3; // AC3 and E-AC3 put the &quot;bsid&quot; version identifier in the same place, but unfortnately the 4 bytes between the syncword and the version identifier are interpreted differently, so grab it here so the following code structure can make sense
		unset($tempAC3header);

		if ($this-&gt;AC3header[&#039;syncinfo&#039;] !== self::syncword) {
			if (!$this-&gt;isDependencyFor(&#039;matroska&#039;)) {
				unset($info[&#039;fileformat&#039;], $info[&#039;ac3&#039;]);
				return $this-&gt;error(&#039;Expecting &quot;&#039;.dechex(self::syncword).&#039;&quot; at offset &#039;.$info[&#039;avdataoffset&#039;].&#039;, found &quot;&#039;.dechex($this-&gt;AC3header[&#039;syncinfo&#039;]).&#039;&quot;&#039;);
			}
		}

		$info[&#039;audio&#039;][&#039;dataformat&#039;]   = &#039;ac3&#039;;
		$info[&#039;audio&#039;][&#039;bitrate_mode&#039;] = &#039;cbr&#039;;
		$info[&#039;audio&#039;][&#039;lossless&#039;]     = false;

		if ($thisfile_ac3_raw_bsi[&#039;bsid&#039;] &lt;= 8) {

			$thisfile_ac3_raw_bsi[&#039;crc1&#039;]       = getid3_lib::Bin2Dec($this-&gt;readHeaderBSI(16));
			$thisfile_ac3_raw_bsi[&#039;fscod&#039;]      =                     $this-&gt;readHeaderBSI(2);   // 5.4.1.3
			$thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;] =                     $this-&gt;readHeaderBSI(6);   // 5.4.1.4
			if ($thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;] &gt; 37) { // binary: 100101 - see Table 5.18 Frame Size Code Table (1 word = 16 bits)
				$this-&gt;warning(&#039;Unexpected ac3.bsi.frmsizecod value: &#039;.$thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;].&#039;, bitrate not set correctly&#039;);
			}

			$thisfile_ac3_raw_bsi[&#039;bsid&#039;]  = $this-&gt;readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended
			$thisfile_ac3_raw_bsi[&#039;bsmod&#039;] = $this-&gt;readHeaderBSI(3);
			$thisfile_ac3_raw_bsi[&#039;acmod&#039;] = $this-&gt;readHeaderBSI(3);

			if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &amp; 0x01) {
				// If the lsb of acmod is a 1, center channel is in use and cmixlev follows in the bit stream.
				$thisfile_ac3_raw_bsi[&#039;cmixlev&#039;] = $this-&gt;readHeaderBSI(2);
				$thisfile_ac3[&#039;center_mix_level&#039;] = self::centerMixLevelLookup($thisfile_ac3_raw_bsi[&#039;cmixlev&#039;]);
			}

			if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &amp; 0x04) {
				// If the msb of acmod is a 1, surround channels are in use and surmixlev follows in the bit stream.
				$thisfile_ac3_raw_bsi[&#039;surmixlev&#039;] = $this-&gt;readHeaderBSI(2);
				$thisfile_ac3[&#039;surround_mix_level&#039;] = self::surroundMixLevelLookup($thisfile_ac3_raw_bsi[&#039;surmixlev&#039;]);
			}

			if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 0x02) {
				// When operating in the two channel mode, this 2-bit code indicates whether or not the program has been encoded in Dolby Surround.
				$thisfile_ac3_raw_bsi[&#039;dsurmod&#039;] = $this-&gt;readHeaderBSI(2);
				$thisfile_ac3[&#039;dolby_surround_mode&#039;] = self::dolbySurroundModeLookup($thisfile_ac3_raw_bsi[&#039;dsurmod&#039;]);
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;] = (bool) $this-&gt;readHeaderBSI(1);

			// This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31.
			// The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent.
			$thisfile_ac3_raw_bsi[&#039;dialnorm&#039;] = $this-&gt;readHeaderBSI(5);                 // 5.4.2.8 dialnorm: Dialogue Normalization, 5 Bits

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr&#039;] = (bool) $this-&gt;readHeaderBSI(1);       // 5.4.2.9 compre: Compression Gain Word Exists, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;compr&#039;] = $this-&gt;readHeaderBSI(8);                // 5.4.2.10 compr: Compression Gain Word, 8 Bits
				$thisfile_ac3[&#039;heavy_compression&#039;] = self::heavyCompression($thisfile_ac3_raw_bsi[&#039;compr&#039;]);
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;langcod&#039;] = (bool) $this-&gt;readHeaderBSI(1);     // 5.4.2.11 langcode: Language Code Exists, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;langcod&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;langcod&#039;] = $this-&gt;readHeaderBSI(8);              // 5.4.2.12 langcod: Language Code, 8 Bits
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodinfo&#039;] = (bool) $this-&gt;readHeaderBSI(1);  // 5.4.2.13 audprodie: Audio Production Information Exists, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodinfo&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;mixlevel&#039;] = $this-&gt;readHeaderBSI(5);             // 5.4.2.14 mixlevel: Mixing Level, 5 Bits
				$thisfile_ac3_raw_bsi[&#039;roomtyp&#039;]  = $this-&gt;readHeaderBSI(2);             // 5.4.2.15 roomtyp: Room Type, 2 Bits

				$thisfile_ac3[&#039;mixing_level&#039;] = (80 + $thisfile_ac3_raw_bsi[&#039;mixlevel&#039;]).&#039;dB&#039;;
				$thisfile_ac3[&#039;room_type&#039;]    = self::roomTypeLookup($thisfile_ac3_raw_bsi[&#039;roomtyp&#039;]);
			}


			$thisfile_ac3_raw_bsi[&#039;dialnorm2&#039;] = $this-&gt;readHeaderBSI(5);                // 5.4.2.16 dialnorm2: Dialogue Normalization, ch2, 5 Bits
			$thisfile_ac3[&#039;dialogue_normalization2&#039;] = &#039;-&#039;.$thisfile_ac3_raw_bsi[&#039;dialnorm2&#039;].&#039;dB&#039;;  // This indicates how far the average dialogue level is below digital 100 percent. Valid values are 1-31. The value of 0 is reserved. The values of 1 to 31 are interpreted as -1 dB to -31 dB with respect to digital 100 percent.

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr2&#039;] = (bool) $this-&gt;readHeaderBSI(1);       // 5.4.2.17 compr2e: Compression Gain Word Exists, ch2, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr2&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;compr2&#039;] = $this-&gt;readHeaderBSI(8);               // 5.4.2.18 compr2: Compression Gain Word, ch2, 8 Bits
				$thisfile_ac3[&#039;heavy_compression2&#039;] = self::heavyCompression($thisfile_ac3_raw_bsi[&#039;compr2&#039;]);
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;langcod2&#039;] = (bool) $this-&gt;readHeaderBSI(1);    // 5.4.2.19 langcod2e: Language Code Exists, ch2, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;langcod2&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;langcod2&#039;] = $this-&gt;readHeaderBSI(8);             // 5.4.2.20 langcod2: Language Code, ch2, 8 Bits
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodinfo2&#039;] = (bool) $this-&gt;readHeaderBSI(1); // 5.4.2.21 audprodi2e: Audio Production Information Exists, ch2, 1 Bit
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodinfo2&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;mixlevel2&#039;] = $this-&gt;readHeaderBSI(5);            // 5.4.2.22 mixlevel2: Mixing Level, ch2, 5 Bits
				$thisfile_ac3_raw_bsi[&#039;roomtyp2&#039;]  = $this-&gt;readHeaderBSI(2);            // 5.4.2.23 roomtyp2: Room Type, ch2, 2 Bits

				$thisfile_ac3[&#039;mixing_level2&#039;] = (80 + $thisfile_ac3_raw_bsi[&#039;mixlevel2&#039;]).&#039;dB&#039;;
				$thisfile_ac3[&#039;room_type2&#039;]    = self::roomTypeLookup($thisfile_ac3_raw_bsi[&#039;roomtyp2&#039;]);
			}

			$thisfile_ac3_raw_bsi[&#039;copyright&#039;] = (bool) $this-&gt;readHeaderBSI(1);         // 5.4.2.24 copyrightb: Copyright Bit, 1 Bit

			$thisfile_ac3_raw_bsi[&#039;original&#039;]  = (bool) $this-&gt;readHeaderBSI(1);         // 5.4.2.25 origbs: Original Bit Stream, 1 Bit

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;timecod1&#039;] = $this-&gt;readHeaderBSI(2);            // 5.4.2.26 timecod1e, timcode2e: Time Code (first and second) Halves Exist, 2 Bits
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;timecod1&#039;] &amp; 0x01) {
				$thisfile_ac3_raw_bsi[&#039;timecod1&#039;] = $this-&gt;readHeaderBSI(14);            // 5.4.2.27 timecod1: Time code first half, 14 bits
				$thisfile_ac3[&#039;timecode1&#039;] = 0;
				$thisfile_ac3[&#039;timecode1&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod1&#039;] &amp; 0x3E00) &gt;&gt;  9) * 3600;  // The first 5 bits of this 14-bit field represent the time in hours, with valid values of 0�23
				$thisfile_ac3[&#039;timecode1&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod1&#039;] &amp; 0x01F8) &gt;&gt;  3) *   60;  // The next 6 bits represent the time in minutes, with valid values of 0�59
				$thisfile_ac3[&#039;timecode1&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod1&#039;] &amp; 0x0003) &gt;&gt;  0) *    8;  // The final 3 bits represents the time in 8 second increments, with valid values of 0�7 (representing 0, 8, 16, ... 56 seconds)
			}
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;timecod1&#039;] &amp; 0x02) {
				$thisfile_ac3_raw_bsi[&#039;timecod2&#039;] = $this-&gt;readHeaderBSI(14);            // 5.4.2.28 timecod2: Time code second half, 14 bits
				$thisfile_ac3[&#039;timecode2&#039;] = 0;
				$thisfile_ac3[&#039;timecode2&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod2&#039;] &amp; 0x3800) &gt;&gt; 11) *   1;              // The first 3 bits of this 14-bit field represent the time in seconds, with valid values from 0�7 (representing 0-7 seconds)
				$thisfile_ac3[&#039;timecode2&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod2&#039;] &amp; 0x07C0) &gt;&gt;  6) *  (1 / 30);        // The next 5 bits represents the time in frames, with valid values from 0�29 (one frame = 1/30th of a second)
				$thisfile_ac3[&#039;timecode2&#039;] += (($thisfile_ac3_raw_bsi[&#039;timecod2&#039;] &amp; 0x003F) &gt;&gt;  0) * ((1 / 30) / 60);  // The final 6 bits represents fractions of 1/64 of a frame, with valid values from 0�63
			}

			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addbsi&#039;] = (bool) $this-&gt;readHeaderBSI(1);
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addbsi&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;addbsi_length&#039;] = $this-&gt;readHeaderBSI(6) + 1; // This 6-bit code, which exists only if addbside is a 1, indicates the length in bytes of additional bit stream information. The valid range of addbsil is 0�63, indicating 1�64 additional bytes, respectively.

				$this-&gt;AC3header[&#039;bsi&#039;] .= getid3_lib::BigEndian2Bin($this-&gt;fread($thisfile_ac3_raw_bsi[&#039;addbsi_length&#039;]));

				$thisfile_ac3_raw_bsi[&#039;addbsi_data&#039;] = substr($this-&gt;AC3header[&#039;bsi&#039;], $this-&gt;BSIoffset, $thisfile_ac3_raw_bsi[&#039;addbsi_length&#039;] * 8);
				$this-&gt;BSIoffset += $thisfile_ac3_raw_bsi[&#039;addbsi_length&#039;] * 8;
			}


		} elseif ($thisfile_ac3_raw_bsi[&#039;bsid&#039;] &lt;= 16) { // E-AC3


			$this-&gt;error(&#039;E-AC3 parsing is incomplete and experimental in this version of getID3 (&#039;.$this-&gt;getid3-&gt;version().&#039;). Notably the bitrate calculations are wrong -- value might (or not) be correct, but it is not calculated correctly. Email info@getid3.org if you know how to calculate EAC3 bitrate correctly.&#039;);
			$info[&#039;audio&#039;][&#039;dataformat&#039;] = &#039;eac3&#039;;

			$thisfile_ac3_raw_bsi[&#039;strmtyp&#039;]          =        $this-&gt;readHeaderBSI(2);
			$thisfile_ac3_raw_bsi[&#039;substreamid&#039;]      =        $this-&gt;readHeaderBSI(3);
			$thisfile_ac3_raw_bsi[&#039;frmsiz&#039;]           =        $this-&gt;readHeaderBSI(11);
			$thisfile_ac3_raw_bsi[&#039;fscod&#039;]            =        $this-&gt;readHeaderBSI(2);
			if ($thisfile_ac3_raw_bsi[&#039;fscod&#039;] == 3) {
				$thisfile_ac3_raw_bsi[&#039;fscod2&#039;]       =        $this-&gt;readHeaderBSI(2);
				$thisfile_ac3_raw_bsi[&#039;numblkscod&#039;] = 3; // six blocks per syncframe
			} else {
				$thisfile_ac3_raw_bsi[&#039;numblkscod&#039;]   =        $this-&gt;readHeaderBSI(2);
			}
			$thisfile_ac3[&#039;bsi&#039;][&#039;blocks_per_sync_frame&#039;] = self::blocksPerSyncFrame($thisfile_ac3_raw_bsi[&#039;numblkscod&#039;]);
			$thisfile_ac3_raw_bsi[&#039;acmod&#039;]            =        $this-&gt;readHeaderBSI(3);
			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;]   = (bool) $this-&gt;readHeaderBSI(1);
			$thisfile_ac3_raw_bsi[&#039;bsid&#039;]             =        $this-&gt;readHeaderBSI(5); // we already know this from pre-parsing the version identifier, but re-read it to let the bitstream flow as intended
			$thisfile_ac3_raw_bsi[&#039;dialnorm&#039;]         =        $this-&gt;readHeaderBSI(5);
			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr&#039;]       = (bool) $this-&gt;readHeaderBSI(1);
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;compr&#039;]        =        $this-&gt;readHeaderBSI(8);
			}
			if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 0) { // if 1+1 mode (dual mono, so some items need a second value)
				$thisfile_ac3_raw_bsi[&#039;dialnorm2&#039;]    =        $this-&gt;readHeaderBSI(5);
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr2&#039;]  = (bool) $this-&gt;readHeaderBSI(1);
				if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;compr2&#039;]) {
					$thisfile_ac3_raw_bsi[&#039;compr2&#039;]   =        $this-&gt;readHeaderBSI(8);
				}
			}
			if ($thisfile_ac3_raw_bsi[&#039;strmtyp&#039;] == 1) { // if dependent stream
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;chanmap&#039;] = (bool) $this-&gt;readHeaderBSI(1);
				if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;chanmap&#039;]) {
					$thisfile_ac3_raw_bsi[&#039;chanmap&#039;]  =        $this-&gt;readHeaderBSI(8);
				}
			}
			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixmdat&#039;]     = (bool) $this-&gt;readHeaderBSI(1);
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixmdat&#039;]) { // Mixing metadata
				if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &gt; 2) { // if more than 2 channels
					$thisfile_ac3_raw_bsi[&#039;dmixmod&#039;]  =        $this-&gt;readHeaderBSI(2);
				}
				if (($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &amp; 0x01) &amp;&amp; ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &gt; 2)) { // if three front channels exist
					$thisfile_ac3_raw_bsi[&#039;ltrtcmixlev&#039;] =        $this-&gt;readHeaderBSI(3);
					$thisfile_ac3_raw_bsi[&#039;lorocmixlev&#039;] =        $this-&gt;readHeaderBSI(3);
				}
				if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &amp; 0x04) { // if a surround channel exists
					$thisfile_ac3_raw_bsi[&#039;ltrtsurmixlev&#039;] =        $this-&gt;readHeaderBSI(3);
					$thisfile_ac3_raw_bsi[&#039;lorosurmixlev&#039;] =        $this-&gt;readHeaderBSI(3);
				}
				if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;]) { // if the LFE channel exists
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfemixlevcod&#039;] = (bool) $this-&gt;readHeaderBSI(1);
					if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfemixlevcod&#039;]) {
						$thisfile_ac3_raw_bsi[&#039;lfemixlevcod&#039;]  =        $this-&gt;readHeaderBSI(5);
					}
				}
				if ($thisfile_ac3_raw_bsi[&#039;strmtyp&#039;] == 0) { // if independent stream
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;pgmscl&#039;] = (bool) $this-&gt;readHeaderBSI(1);
					if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;pgmscl&#039;]) {
						$thisfile_ac3_raw_bsi[&#039;pgmscl&#039;]  =        $this-&gt;readHeaderBSI(6);
					}
					if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 0) { // if 1+1 mode (dual mono, so some items need a second value)
						$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;pgmscl2&#039;] = (bool) $this-&gt;readHeaderBSI(1);
						if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;pgmscl2&#039;]) {
							$thisfile_ac3_raw_bsi[&#039;pgmscl2&#039;]  =        $this-&gt;readHeaderBSI(6);
						}
					}
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmscl&#039;] = (bool) $this-&gt;readHeaderBSI(1);
					if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmscl&#039;]) {
						$thisfile_ac3_raw_bsi[&#039;extpgmscl&#039;]  =        $this-&gt;readHeaderBSI(6);
					}
					$thisfile_ac3_raw_bsi[&#039;mixdef&#039;]  =        $this-&gt;readHeaderBSI(2);
					if ($thisfile_ac3_raw_bsi[&#039;mixdef&#039;] == 1) { // mixing option 2
						$thisfile_ac3_raw_bsi[&#039;premixcmpsel&#039;]  = (bool) $this-&gt;readHeaderBSI(1);
						$thisfile_ac3_raw_bsi[&#039;drcsrc&#039;]        = (bool) $this-&gt;readHeaderBSI(1);
						$thisfile_ac3_raw_bsi[&#039;premixcmpscl&#039;]  =        $this-&gt;readHeaderBSI(3);
					} elseif ($thisfile_ac3_raw_bsi[&#039;mixdef&#039;] == 2) { // mixing option 3
						$thisfile_ac3_raw_bsi[&#039;mixdata&#039;]       =        $this-&gt;readHeaderBSI(12);
					} elseif ($thisfile_ac3_raw_bsi[&#039;mixdef&#039;] == 3) { // mixing option 4
						$mixdefbitsread = 0;
						$thisfile_ac3_raw_bsi[&#039;mixdeflen&#039;]     =        $this-&gt;readHeaderBSI(5); $mixdefbitsread += 5;
						$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixdata2&#039;] = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
						if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixdata2&#039;]) {
							$thisfile_ac3_raw_bsi[&#039;premixcmpsel&#039;]  = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							$thisfile_ac3_raw_bsi[&#039;drcsrc&#039;]        = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							$thisfile_ac3_raw_bsi[&#039;premixcmpscl&#039;]  =        $this-&gt;readHeaderBSI(3); $mixdefbitsread += 3;
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlscl&#039;]   = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmlscl&#039;]    =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmcscl&#039;]   = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmcscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmcscl&#039;]    =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmrscl&#039;]   = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmrscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmrscl&#039;]    =        $this-&gt;readHeaderBSI(4);
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlsscl&#039;]  = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlsscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmlsscl&#039;]   =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmrsscl&#039;]  = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmrsscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmrsscl&#039;]   =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlfescl&#039;] = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmlfescl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;extpgmlfescl&#039;]  =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;dmixscl&#039;]      = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;dmixscl&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;dmixscl&#039;]       =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
							}
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addch&#039;]        = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addch&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmaux1scl&#039;]   = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
								if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmaux1scl&#039;]) {
									$thisfile_ac3_raw_bsi[&#039;extpgmaux1scl&#039;]    =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
								}
								$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmaux2scl&#039;]   = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
								if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;extpgmaux2scl&#039;]) {
									$thisfile_ac3_raw_bsi[&#039;extpgmaux2scl&#039;]    =        $this-&gt;readHeaderBSI(4); $mixdefbitsread += 4;
								}
							}
						}
						$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixdata3&#039;] = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
						if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;mixdata3&#039;]) {
							$thisfile_ac3_raw_bsi[&#039;spchdat&#039;]   =        $this-&gt;readHeaderBSI(5); $mixdefbitsread += 5;
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addspchdat&#039;] = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addspchdat&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;spchdat1&#039;]   =         $this-&gt;readHeaderBSI(5); $mixdefbitsread += 5;
								$thisfile_ac3_raw_bsi[&#039;spchan1att&#039;] =         $this-&gt;readHeaderBSI(2); $mixdefbitsread += 2;
								$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addspchdat1&#039;] = (bool) $this-&gt;readHeaderBSI(1); $mixdefbitsread += 1;
								if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addspchdat1&#039;]) {
									$thisfile_ac3_raw_bsi[&#039;spchdat2&#039;]   =         $this-&gt;readHeaderBSI(5); $mixdefbitsread += 5;
									$thisfile_ac3_raw_bsi[&#039;spchan2att&#039;] =         $this-&gt;readHeaderBSI(3); $mixdefbitsread += 3;
								}
							}
						}
						$mixdata_bits = (8 * ($thisfile_ac3_raw_bsi[&#039;mixdeflen&#039;] + 2)) - $mixdefbitsread;
						$mixdata_fill = (($mixdata_bits % 8) ? 8 - ($mixdata_bits % 8) : 0);
						$thisfile_ac3_raw_bsi[&#039;mixdata&#039;]     =        $this-&gt;readHeaderBSI($mixdata_bits);
						$thisfile_ac3_raw_bsi[&#039;mixdatafill&#039;] =        $this-&gt;readHeaderBSI($mixdata_fill);
						unset($mixdefbitsread, $mixdata_bits, $mixdata_fill);
					}
					if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &lt; 2) { // if mono or dual mono source
						$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;paninfo&#039;] = (bool) $this-&gt;readHeaderBSI(1);
						if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;paninfo&#039;]) {
							$thisfile_ac3_raw_bsi[&#039;panmean&#039;]   =        $this-&gt;readHeaderBSI(8);
							$thisfile_ac3_raw_bsi[&#039;paninfo&#039;]   =        $this-&gt;readHeaderBSI(6);
						}
						if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 0) { // if 1+1 mode (dual mono, so some items need a second value)
							$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;paninfo2&#039;] = (bool) $this-&gt;readHeaderBSI(1);
							if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;paninfo2&#039;]) {
								$thisfile_ac3_raw_bsi[&#039;panmean2&#039;]   =        $this-&gt;readHeaderBSI(8);
								$thisfile_ac3_raw_bsi[&#039;paninfo2&#039;]   =        $this-&gt;readHeaderBSI(6);
							}
						}
					}
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;frmmixcfginfo&#039;] = (bool) $this-&gt;readHeaderBSI(1);
					if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;frmmixcfginfo&#039;]) { // mixing configuration information
						if ($thisfile_ac3_raw_bsi[&#039;numblkscod&#039;] == 0) {
							$thisfile_ac3_raw_bsi[&#039;blkmixcfginfo&#039;][0]  =        $this-&gt;readHeaderBSI(5);
						} else {
							for ($blk = 0; $blk &lt; $thisfile_ac3_raw_bsi[&#039;numblkscod&#039;]; $blk++) {
								$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;blkmixcfginfo&#039;.$blk] = (bool) $this-&gt;readHeaderBSI(1);
								if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;blkmixcfginfo&#039;.$blk]) { // mixing configuration information
									$thisfile_ac3_raw_bsi[&#039;blkmixcfginfo&#039;][$blk]  =        $this-&gt;readHeaderBSI(5);
								}
							}
						}
					}
				}
			}
			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;infomdat&#039;]          = (bool) $this-&gt;readHeaderBSI(1);
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;infomdat&#039;]) { // Informational metadata
				$thisfile_ac3_raw_bsi[&#039;bsmod&#039;]                  =        $this-&gt;readHeaderBSI(3);
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;copyrightb&#039;]    = (bool) $this-&gt;readHeaderBSI(1);
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;origbs&#039;]        = (bool) $this-&gt;readHeaderBSI(1);
				if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 2) { //  if in 2/0 mode
					$thisfile_ac3_raw_bsi[&#039;dsurmod&#039;]            =        $this-&gt;readHeaderBSI(2);
					$thisfile_ac3_raw_bsi[&#039;dheadphonmod&#039;]       =        $this-&gt;readHeaderBSI(2);
				}
				if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] &gt;= 6) { //  if both surround channels exist
					$thisfile_ac3_raw_bsi[&#039;dsurexmod&#039;]          =        $this-&gt;readHeaderBSI(2);
				}
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodi&#039;]      = (bool) $this-&gt;readHeaderBSI(1);
				if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodi&#039;]) {
					$thisfile_ac3_raw_bsi[&#039;mixlevel&#039;]           =        $this-&gt;readHeaderBSI(5);
					$thisfile_ac3_raw_bsi[&#039;roomtyp&#039;]            =        $this-&gt;readHeaderBSI(2);
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;adconvtyp&#039;] = (bool) $this-&gt;readHeaderBSI(1);
				}
				if ($thisfile_ac3_raw_bsi[&#039;acmod&#039;] == 0) { //  if 1+1 mode (dual mono, so some items need a second value)
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodi2&#039;]      = (bool) $this-&gt;readHeaderBSI(1);
					if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;audprodi2&#039;]) {
						$thisfile_ac3_raw_bsi[&#039;mixlevel2&#039;]           =        $this-&gt;readHeaderBSI(5);
						$thisfile_ac3_raw_bsi[&#039;roomtyp2&#039;]            =        $this-&gt;readHeaderBSI(2);
						$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;adconvtyp2&#039;] = (bool) $this-&gt;readHeaderBSI(1);
					}
				}
				if ($thisfile_ac3_raw_bsi[&#039;fscod&#039;] &lt; 3) { // if not half sample rate
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;sourcefscod&#039;] = (bool) $this-&gt;readHeaderBSI(1);
				}
			}
			if (($thisfile_ac3_raw_bsi[&#039;strmtyp&#039;] == 0) &amp;&amp; ($thisfile_ac3_raw_bsi[&#039;numblkscod&#039;] != 3)) { //  if both surround channels exist
				$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;convsync&#039;] = (bool) $this-&gt;readHeaderBSI(1);
			}
			if ($thisfile_ac3_raw_bsi[&#039;strmtyp&#039;] == 2) { //  if bit stream converted from AC-3
				if ($thisfile_ac3_raw_bsi[&#039;numblkscod&#039;] != 3) { // 6 blocks per syncframe
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;blkid&#039;]  = 1;
				} else {
					$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;blkid&#039;]  = (bool) $this-&gt;readHeaderBSI(1);
				}
				if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;blkid&#039;]) {
					$thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;]  =        $this-&gt;readHeaderBSI(6);
				}
			}
			$thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addbsi&#039;]  = (bool) $this-&gt;readHeaderBSI(1);
			if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;addbsi&#039;]) {
				$thisfile_ac3_raw_bsi[&#039;addbsil&#039;]  =        $this-&gt;readHeaderBSI(6);
				$thisfile_ac3_raw_bsi[&#039;addbsi&#039;]   =        $this-&gt;readHeaderBSI(($thisfile_ac3_raw_bsi[&#039;addbsil&#039;] + 1) * 8);
			}

		} else {

			$this-&gt;error(&#039;Bit stream identification is version &#039;.$thisfile_ac3_raw_bsi[&#039;bsid&#039;].&#039;, but getID3() only understands up to version 16. Please submit a support ticket with a sample file.&#039;);
			unset($info[&#039;ac3&#039;]);
			return false;

		}

		if (isset($thisfile_ac3_raw_bsi[&#039;fscod2&#039;])) {
			$thisfile_ac3[&#039;sample_rate&#039;] = self::sampleRateCodeLookup2($thisfile_ac3_raw_bsi[&#039;fscod2&#039;]);
		} else {
			$thisfile_ac3[&#039;sample_rate&#039;] = self::sampleRateCodeLookup($thisfile_ac3_raw_bsi[&#039;fscod&#039;]);
		}
		if ($thisfile_ac3_raw_bsi[&#039;fscod&#039;] &lt;= 3) {
			$info[&#039;audio&#039;][&#039;sample_rate&#039;] = $thisfile_ac3[&#039;sample_rate&#039;];
		} else {
			$this-&gt;warning(&#039;Unexpected ac3.bsi.fscod value: &#039;.$thisfile_ac3_raw_bsi[&#039;fscod&#039;]);
		}
		if (isset($thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;])) {
			$thisfile_ac3[&#039;frame_length&#039;] = self::frameSizeLookup($thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;], $thisfile_ac3_raw_bsi[&#039;fscod&#039;]);
			$thisfile_ac3[&#039;bitrate&#039;]      = self::bitrateLookup($thisfile_ac3_raw_bsi[&#039;frmsizecod&#039;]);
		} elseif (!empty($thisfile_ac3_raw_bsi[&#039;frmsiz&#039;])) {
			// this isn&#039;t right, but it&#039;s (usually) close, roughly 5% less than it should be.
			// but WHERE is the actual bitrate value stored in EAC3?? email info@getid3.org if you know!
			$thisfile_ac3[&#039;bitrate&#039;]      = ($thisfile_ac3_raw_bsi[&#039;frmsiz&#039;] + 1) * 16 * 30; // The frmsiz field shall contain a value one less than the overall size of the coded syncframe in 16-bit words. That is, this field may assume a value ranging from 0 to 2047, and these values correspond to syncframe sizes ranging from 1 to 2048.
			// kludge-fix to make it approximately the expected value, still not &quot;right&quot;:
			$thisfile_ac3[&#039;bitrate&#039;] = round(($thisfile_ac3[&#039;bitrate&#039;] * 1.05) / 16000) * 16000;
		}
		$info[&#039;audio&#039;][&#039;bitrate&#039;] = $thisfile_ac3[&#039;bitrate&#039;];

		if (isset($thisfile_ac3_raw_bsi[&#039;bsmod&#039;]) &amp;&amp; isset($thisfile_ac3_raw_bsi[&#039;acmod&#039;])) {
			$thisfile_ac3[&#039;service_type&#039;] = self::serviceTypeLookup($thisfile_ac3_raw_bsi[&#039;bsmod&#039;], $thisfile_ac3_raw_bsi[&#039;acmod&#039;]);
		}
		$ac3_coding_mode = self::audioCodingModeLookup($thisfile_ac3_raw_bsi[&#039;acmod&#039;]);
		foreach($ac3_coding_mode as $key =&gt; $value) {
			$thisfile_ac3[$key] = $value;
		}
		switch ($thisfile_ac3_raw_bsi[&#039;acmod&#039;]) {
			case 0:
			case 1:
				$info[&#039;audio&#039;][&#039;channelmode&#039;] = &#039;mono&#039;;
				break;
			case 3:
			case 4:
				$info[&#039;audio&#039;][&#039;channelmode&#039;] = &#039;stereo&#039;;
				break;
			default:
				$info[&#039;audio&#039;][&#039;channelmode&#039;] = &#039;surround&#039;;
				break;
		}
		$info[&#039;audio&#039;][&#039;channels&#039;] = $thisfile_ac3[&#039;num_channels&#039;];

		$thisfile_ac3[&#039;lfe_enabled&#039;] = $thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;];
		if ($thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;]) {
			$info[&#039;audio&#039;][&#039;channels&#039;] .= &#039;.1&#039;;
		}

		$thisfile_ac3[&#039;channels_enabled&#039;] = self::channelsEnabledLookup($thisfile_ac3_raw_bsi[&#039;acmod&#039;], $thisfile_ac3_raw_bsi[&#039;flags&#039;][&#039;lfeon&#039;]);
		$thisfile_ac3[&#039;dialogue_normalization&#039;] = &#039;-&#039;.$thisfile_ac3_raw_bsi[&#039;dialnorm&#039;].&#039;dB&#039;;

		return true;
	}

	/**
	 * @param int $length
	 *
	 * @return int
	 */
	private function readHeaderBSI($length) {
		$data = substr($this-&gt;AC3header[&#039;bsi&#039;], $this-&gt;BSIoffset, $length);
		$this-&gt;BSIoffset += $length;

		return bindec($data);
	}

	/**
	 * @param int $fscod
	 *
	 * @return int|string|false
	 */
	public static function sampleRateCodeLookup($fscod) {
		static $sampleRateCodeLookup = array(
			0 =&gt; 48000,
			1 =&gt; 44100,
			2 =&gt; 32000,
			3 =&gt; &#039;reserved&#039; // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute.
		);
		return (isset($sampleRateCodeLookup[$fscod]) ? $sampleRateCodeLookup[$fscod] : false);
	}

	/**
	 * @param int $fscod2
	 *
	 * @return int|string|false
	 */
	public static function sampleRateCodeLookup2($fscod2) {
		static $sampleRateCodeLookup2 = array(
			0 =&gt; 24000,
			1 =&gt; 22050,
			2 =&gt; 16000,
			3 =&gt; &#039;reserved&#039; // If the reserved code is indicated, the decoder should not attempt to decode audio and should mute.
		);
		return (isset($sampleRateCodeLookup2[$fscod2]) ? $sampleRateCodeLookup2[$fscod2] : false);
	}

	/**
	 * @param int $bsmod
	 * @param int $acmod
	 *
	 * @return string|false
	 */
	public static function serviceTypeLookup($bsmod, $acmod) {
		static $serviceTypeLookup = array();
		if (empty($serviceTypeLookup)) {
			for ($i = 0; $i &lt;= 7; $i++) {
				$serviceTypeLookup[0][$i] = &#039;main audio service: complete main (CM)&#039;;
				$serviceTypeLookup[1][$i] = &#039;main audio service: music and effects (ME)&#039;;
				$serviceTypeLookup[2][$i] = &#039;associated service: visually impaired (VI)&#039;;
				$serviceTypeLookup[3][$i] = &#039;associated service: hearing impaired (HI)&#039;;
				$serviceTypeLookup[4][$i] = &#039;associated service: dialogue (D)&#039;;
				$serviceTypeLookup[5][$i] = &#039;associated service: commentary (C)&#039;;
				$serviceTypeLookup[6][$i] = &#039;associated service: emergency (E)&#039;;
			}

			$serviceTypeLookup[7][1]      = &#039;associated service: voice over (VO)&#039;;
			for ($i = 2; $i &lt;= 7; $i++) {
				$serviceTypeLookup[7][$i] = &#039;main audio service: karaoke&#039;;
			}
		}
		return (isset($serviceTypeLookup[$bsmod][$acmod]) ? $serviceTypeLookup[$bsmod][$acmod] : false);
	}

	/**
	 * @param int $acmod
	 *
	 * @return array|false
	 */
	public static function audioCodingModeLookup($acmod) {
		// array(channel configuration, # channels (not incl LFE), channel order)
		static $audioCodingModeLookup = array (
			0 =&gt; array(&#039;channel_config&#039;=&gt;&#039;1+1&#039;, &#039;num_channels&#039;=&gt;2, &#039;channel_order&#039;=&gt;&#039;Ch1,Ch2&#039;),
			1 =&gt; array(&#039;channel_config&#039;=&gt;&#039;1/0&#039;, &#039;num_channels&#039;=&gt;1, &#039;channel_order&#039;=&gt;&#039;C&#039;),
			2 =&gt; array(&#039;channel_config&#039;=&gt;&#039;2/0&#039;, &#039;num_channels&#039;=&gt;2, &#039;channel_order&#039;=&gt;&#039;L,R&#039;),
			3 =&gt; array(&#039;channel_config&#039;=&gt;&#039;3/0&#039;, &#039;num_channels&#039;=&gt;3, &#039;channel_order&#039;=&gt;&#039;L,C,R&#039;),
			4 =&gt; array(&#039;channel_config&#039;=&gt;&#039;2/1&#039;, &#039;num_channels&#039;=&gt;3, &#039;channel_order&#039;=&gt;&#039;L,R,S&#039;),
			5 =&gt; array(&#039;channel_config&#039;=&gt;&#039;3/1&#039;, &#039;num_channels&#039;=&gt;4, &#039;channel_order&#039;=&gt;&#039;L,C,R,S&#039;),
			6 =&gt; array(&#039;channel_config&#039;=&gt;&#039;2/2&#039;, &#039;num_channels&#039;=&gt;4, &#039;channel_order&#039;=&gt;&#039;L,R,SL,SR&#039;),
			7 =&gt; array(&#039;channel_config&#039;=&gt;&#039;3/2&#039;, &#039;num_channels&#039;=&gt;5, &#039;channel_order&#039;=&gt;&#039;L,C,R,SL,SR&#039;),
		);
		return (isset($audioCodingModeLookup[$acmod]) ? $audioCodingModeLookup[$acmod] : false);
	}

	/**
	 * @param int $cmixlev
	 *
	 * @return int|float|string|false
	 */
	public static function centerMixLevelLookup($cmixlev) {
		static $centerMixLevelLookup;
		if (empty($centerMixLevelLookup)) {
			$centerMixLevelLookup = array(
				0 =&gt; pow(2, -3.0 / 6), // 0.707 (-3.0 dB)
				1 =&gt; pow(2, -4.5 / 6), // 0.595 (-4.5 dB)
				2 =&gt; pow(2, -6.0 / 6), // 0.500 (-6.0 dB)
				3 =&gt; &#039;reserved&#039;
			);
		}
		return (isset($centerMixLevelLookup[$cmixlev]) ? $centerMixLevelLookup[$cmixlev] : false);
	}

	/**
	 * @param int $surmixlev
	 *
	 * @return int|float|string|false
	 */
	public static function surroundMixLevelLookup($surmixlev) {
		static $surroundMixLevelLookup;
		if (empty($surroundMixLevelLookup)) {
			$surroundMixLevelLookup = array(
				0 =&gt; pow(2, -3.0 / 6),
				1 =&gt; pow(2, -6.0 / 6),
				2 =&gt; 0,
				3 =&gt; &#039;reserved&#039;
			);
		}
		return (isset($surroundMixLevelLookup[$surmixlev]) ? $surroundMixLevelLookup[$surmixlev] : false);
	}

	/**
	 * @param int $dsurmod
	 *
	 * @return string|false
	 */
	public static function dolbySurroundModeLookup($dsurmod) {
		static $dolbySurroundModeLookup = array(
			0 =&gt; &#039;not indicated&#039;,
			1 =&gt; &#039;Not Dolby Surround encoded&#039;,
			2 =&gt; &#039;Dolby Surround encoded&#039;,
			3 =&gt; &#039;reserved&#039;
		);
		return (isset($dolbySurroundModeLookup[$dsurmod]) ? $dolbySurroundModeLookup[$dsurmod] : false);
	}

	/**
	 * @param int  $acmod
	 * @param bool $lfeon
	 *
	 * @return array
	 */
	public static function channelsEnabledLookup($acmod, $lfeon) {
		$lookup = array(
			&#039;ch1&#039;=&gt;($acmod == 0),
			&#039;ch2&#039;=&gt;($acmod == 0),
			&#039;left&#039;=&gt;($acmod &gt; 1),
			&#039;right&#039;=&gt;($acmod &gt; 1),
			&#039;center&#039;=&gt;(bool) ($acmod &amp; 0x01),
			&#039;surround_mono&#039;=&gt;false,
			&#039;surround_left&#039;=&gt;false,
			&#039;surround_right&#039;=&gt;false,
			&#039;lfe&#039;=&gt;$lfeon);
		switch ($acmod) {
			case 4:
			case 5:
				$lookup[&#039;surround_mono&#039;]  = true;
				break;
			case 6:
			case 7:
				$lookup[&#039;surround_left&#039;]  = true;
				$lookup[&#039;surround_right&#039;] = true;
				break;
		}
		return $lookup;
	}

	/**
	 * @param int $compre
	 *
	 * @return float|int
	 */
	public static function heavyCompression($compre) {
		// The first four bits indicate gain changes in 6.02dB increments which can be
		// implemented with an arithmetic shift operation. The following four bits
		// indicate linear gain changes, and require a 5-bit multiply.
		// We will represent the two 4-bit fields of compr as follows:
		//   X0 X1 X2 X3 . Y4 Y5 Y6 Y7
		// The meaning of the X values is most simply described by considering X to represent a 4-bit
		// signed integer with values from -8 to +7. The gain indicated by X is then (X + 1) * 6.02 dB. The
		// following table shows this in detail.

		// Meaning of 4 msb of compr
		//  7    +48.16 dB
		//  6    +42.14 dB
		//  5    +36.12 dB
		//  4    +30.10 dB
		//  3    +24.08 dB
		//  2    +18.06 dB
		//  1    +12.04 dB
		//  0     +6.02 dB
		// -1         0 dB
		// -2     -6.02 dB
		// -3    -12.04 dB
		// -4    -18.06 dB
		// -5    -24.08 dB
		// -6    -30.10 dB
		// -7    -36.12 dB
		// -8    -42.14 dB

		$fourbit = str_pad(decbin(($compre &amp; 0xF0) &gt;&gt; 4), 4, &#039;0&#039;, STR_PAD_LEFT);
		if ($fourbit[0] == &#039;1&#039;) {
			$log_gain = -8 + bindec(substr($fourbit, 1));
		} else {
			$log_gain = bindec(substr($fourbit, 1));
		}
		$log_gain = ($log_gain + 1) * getid3_lib::RGADamplitude2dB(2);

		// The value of Y is a linear representation of a gain change of up to -6 dB. Y is considered to
		// be an unsigned fractional integer, with a leading value of 1, or: 0.1 Y4 Y5 Y6 Y7 (base 2). Y can
		// represent values between 0.111112 (or 31/32) and 0.100002 (or 1/2). Thus, Y can represent gain
		// changes from -0.28 dB to -6.02 dB.

		$lin_gain = (16 + ($compre &amp; 0x0F)) / 32;

		// The combination of X and Y values allows compr to indicate gain changes from
		//  48.16 - 0.28 = +47.89 dB, to
		// -42.14 - 6.02 = -48.16 dB.

		return $log_gain - $lin_gain;
	}

	/**
	 * @param int $roomtyp
	 *
	 * @return string|false
	 */
	public static function roomTypeLookup($roomtyp) {
		static $roomTypeLookup = array(
			0 =&gt; &#039;not indicated&#039;,
			1 =&gt; &#039;large room, X curve monitor&#039;,
			2 =&gt; &#039;small room, flat monitor&#039;,
			3 =&gt; &#039;reserved&#039;
		);
		return (isset($roomTypeLookup[$roomtyp]) ? $roomTypeLookup[$roomtyp] : false);
	}

	/**
	 * @param int $frmsizecod
	 * @param int $fscod
	 *
	 * @return int|false
	 */
	public static function frameSizeLookup($frmsizecod, $fscod) {
		// LSB is whether padding is used or not
		$padding     = (bool) ($frmsizecod &amp; 0x01);
		$framesizeid =        ($frmsizecod &amp; 0x3E) &gt;&gt; 1;

		static $frameSizeLookup = array();
		if (empty($frameSizeLookup)) {
			$frameSizeLookup = array (
				0  =&gt; array( 128,  138,  192),  //  32 kbps
				1  =&gt; array( 160,  174,  240),  //  40 kbps
				2  =&gt; array( 192,  208,  288),  //  48 kbps
				3  =&gt; array( 224,  242,  336),  //  56 kbps
				4  =&gt; array( 256,  278,  384),  //  64 kbps
				5  =&gt; array( 320,  348,  480),  //  80 kbps
				6  =&gt; array( 384,  416,  576),  //  96 kbps
				7  =&gt; array( 448,  486,  672),  // 112 kbps
				8  =&gt; array( 512,  556,  768),  // 128 kbps
				9  =&gt; array( 640,  696,  960),  // 160 kbps
				10 =&gt; array( 768,  834, 1152),  // 192 kbps
				11 =&gt; array( 896,  974, 1344),  // 224 kbps
				12 =&gt; array(1024, 1114, 1536),  // 256 kbps
				13 =&gt; array(1280, 1392, 1920),  // 320 kbps
				14 =&gt; array(1536, 1670, 2304),  // 384 kbps
				15 =&gt; array(1792, 1950, 2688),  // 448 kbps
				16 =&gt; array(2048, 2228, 3072),  // 512 kbps
				17 =&gt; array(2304, 2506, 3456),  // 576 kbps
				18 =&gt; array(2560, 2786, 3840)   // 640 kbps
			);
		}
		$paddingBytes = 0;
		if (($fscod == 1) &amp;&amp; $padding) {
			// frame lengths are padded by 1 word (16 bits) at 44100
			// (fscode==1) means 44100Hz (see sampleRateCodeLookup)
			$paddingBytes = 2;
		}
		return (isset($frameSizeLookup[$framesizeid][$fscod]) ? $frameSizeLookup[$framesizeid][$fscod] + $paddingBytes : false);
	}

	/**
	 * @param int $frmsizecod
	 *
	 * @return int|false
	 */
	public static function bitrateLookup($frmsizecod) {
		// LSB is whether padding is used or not
		$padding     = (bool) ($frmsizecod &amp; 0x01);
		$framesizeid =        ($frmsizecod &amp; 0x3E) &gt;&gt; 1;

		static $bitrateLookup = array(
			 0 =&gt;  32000,
			 1 =&gt;  40000,
			 2 =&gt;  48000,
			 3 =&gt;  56000,
			 4 =&gt;  64000,
			 5 =&gt;  80000,
			 6 =&gt;  96000,
			 7 =&gt; 112000,
			 8 =&gt; 128000,
			 9 =&gt; 160000,
			10 =&gt; 192000,
			11 =&gt; 224000,
			12 =&gt; 256000,
			13 =&gt; 320000,
			14 =&gt; 384000,
			15 =&gt; 448000,
			16 =&gt; 512000,
			17 =&gt; 576000,
			18 =&gt; 640000,
		);
		return (isset($bitrateLookup[$framesizeid]) ? $bitrateLookup[$framesizeid] : false);
	}

	/**
	 * @param int $numblkscod
	 *
	 * @return int|false
	 */
	public static function blocksPerSyncFrame($numblkscod) {
		static $blocksPerSyncFrameLookup = array(
			0 =&gt; 1,
			1 =&gt; 2,
			2 =&gt; 3,
			3 =&gt; 6,
		);
		return (isset($blocksPerSyncFrameLookup[$numblkscod]) ? $blocksPerSyncFrameLookup[$numblkscod] : false);
	}


}
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