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функция не описана

getid3_mp3::decodeMPEGaudioHeader() public WP 1.0

Это метод класса: getid3_mp3{}

Хуков нет.

Возвращает

true/false.

Использование

$getid3_mp3 = new getid3_mp3();
$getid3_mp3->decodeMPEGaudioHeader( $offset, $info, $recursivesearch, $ScanAsCBR, $FastMPEGheaderScan );
$offset(число) (обязательный)
$info(массив) (обязательный) (передается по ссылке — &)
$recursivesearch(true/false)

По умолчанию: true
$ScanAsCBR(true/false)

По умолчанию: false
$FastMPEGheaderScan(true/false)

По умолчанию: false

Код getid3_mp3::decodeMPEGaudioHeader() WP 5.5.1

wp-includes/ID3/module.audio.mp3.php
<?php
public function decodeMPEGaudioHeader($offset, &$info, $recursivesearch=true, $ScanAsCBR=false, $FastMPEGheaderScan=false) {
	static $MPEGaudioVersionLookup;
	static $MPEGaudioLayerLookup;
	static $MPEGaudioBitrateLookup;
	static $MPEGaudioFrequencyLookup;
	static $MPEGaudioChannelModeLookup;
	static $MPEGaudioModeExtensionLookup;
	static $MPEGaudioEmphasisLookup;
	if (empty($MPEGaudioVersionLookup)) {
		$MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();
		$MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();
		$MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();
		$MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();
		$MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();
		$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
		$MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();
	}

	if ($this->fseek($offset) != 0) {
		$this->error('decodeMPEGaudioHeader() failed to seek to next offset at '.$offset);
		return false;
	}
	//$headerstring = $this->fread(1441); // worst-case max length = 32kHz @ 320kbps layer 3 = 1441 bytes/frame
	$headerstring = $this->fread(226); // LAME header at offset 36 + 190 bytes of Xing/LAME data

	// MP3 audio frame structure:
	// $aa $aa $aa $aa [$bb $bb] $cc...
	// where $aa..$aa is the four-byte mpeg-audio header (below)
	// $bb $bb is the optional 2-byte CRC
	// and $cc... is the audio data

	$head4 = substr($headerstring, 0, 4);
	$head4_key = getid3_lib::PrintHexBytes($head4, true, false, false);
	static $MPEGaudioHeaderDecodeCache = array();
	if (isset($MPEGaudioHeaderDecodeCache[$head4_key])) {
		$MPEGheaderRawArray = $MPEGaudioHeaderDecodeCache[$head4_key];
	} else {
		$MPEGheaderRawArray = self::MPEGaudioHeaderDecode($head4);
		$MPEGaudioHeaderDecodeCache[$head4_key] = $MPEGheaderRawArray;
	}

	static $MPEGaudioHeaderValidCache = array();
	if (!isset($MPEGaudioHeaderValidCache[$head4_key])) { // Not in cache
		//$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, true);  // allow badly-formatted freeformat (from LAME 3.90 - 3.93.1)
		$MPEGaudioHeaderValidCache[$head4_key] = self::MPEGaudioHeaderValid($MPEGheaderRawArray, false, false);
	}

	// shortcut
	if (!isset($info['mpeg']['audio'])) {
		$info['mpeg']['audio'] = array();
	}
	$thisfile_mpeg_audio = &$info['mpeg']['audio'];

	if ($MPEGaudioHeaderValidCache[$head4_key]) {
		$thisfile_mpeg_audio['raw'] = $MPEGheaderRawArray;
	} else {
		$this->error('Invalid MPEG audio header ('.getid3_lib::PrintHexBytes($head4).') at offset '.$offset);
		return false;
	}

	if (!$FastMPEGheaderScan) {
		$thisfile_mpeg_audio['version']       = $MPEGaudioVersionLookup[$thisfile_mpeg_audio['raw']['version']];
		$thisfile_mpeg_audio['layer']         = $MPEGaudioLayerLookup[$thisfile_mpeg_audio['raw']['layer']];

		$thisfile_mpeg_audio['channelmode']   = $MPEGaudioChannelModeLookup[$thisfile_mpeg_audio['raw']['channelmode']];
		$thisfile_mpeg_audio['channels']      = (($thisfile_mpeg_audio['channelmode'] == 'mono') ? 1 : 2);
		$thisfile_mpeg_audio['sample_rate']   = $MPEGaudioFrequencyLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['raw']['sample_rate']];
		$thisfile_mpeg_audio['protection']    = !$thisfile_mpeg_audio['raw']['protection'];
		$thisfile_mpeg_audio['private']       = (bool) $thisfile_mpeg_audio['raw']['private'];
		$thisfile_mpeg_audio['modeextension'] = $MPEGaudioModeExtensionLookup[$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['modeextension']];
		$thisfile_mpeg_audio['copyright']     = (bool) $thisfile_mpeg_audio['raw']['copyright'];
		$thisfile_mpeg_audio['original']      = (bool) $thisfile_mpeg_audio['raw']['original'];
		$thisfile_mpeg_audio['emphasis']      = $MPEGaudioEmphasisLookup[$thisfile_mpeg_audio['raw']['emphasis']];

		$info['audio']['channels']    = $thisfile_mpeg_audio['channels'];
		$info['audio']['sample_rate'] = $thisfile_mpeg_audio['sample_rate'];

		if ($thisfile_mpeg_audio['protection']) {
			$thisfile_mpeg_audio['crc'] = getid3_lib::BigEndian2Int(substr($headerstring, 4, 2));
		}
	}

	if ($thisfile_mpeg_audio['raw']['bitrate'] == 15) {
		// http://www.hydrogenaudio.org/?act=ST&f=16&t=9682&st=0
		$this->warning('Invalid bitrate index (15), this is a known bug in free-format MP3s encoded by LAME v3.90 - 3.93.1');
		$thisfile_mpeg_audio['raw']['bitrate'] = 0;
	}
	$thisfile_mpeg_audio['padding'] = (bool) $thisfile_mpeg_audio['raw']['padding'];
	$thisfile_mpeg_audio['bitrate'] = $MPEGaudioBitrateLookup[$thisfile_mpeg_audio['version']][$thisfile_mpeg_audio['layer']][$thisfile_mpeg_audio['raw']['bitrate']];

	if (($thisfile_mpeg_audio['bitrate'] == 'free') && ($offset == $info['avdataoffset'])) {
		// only skip multiple frame check if free-format bitstream found at beginning of file
		// otherwise is quite possibly simply corrupted data
		$recursivesearch = false;
	}

	// For Layer 2 there are some combinations of bitrate and mode which are not allowed.
	if (!$FastMPEGheaderScan && ($thisfile_mpeg_audio['layer'] == '2')) {

		$info['audio']['dataformat'] = 'mp2';
		switch ($thisfile_mpeg_audio['channelmode']) {

			case 'mono':
				if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] <= 192000)) {
					// these are ok
				} else {
					$this->error($thisfile_mpeg_audio['bitrate'].'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
					return false;
				}
				break;

			case 'stereo':
			case 'joint stereo':
			case 'dual channel':
				if (($thisfile_mpeg_audio['bitrate'] == 'free') || ($thisfile_mpeg_audio['bitrate'] == 64000) || ($thisfile_mpeg_audio['bitrate'] >= 96000)) {
					// these are ok
				} else {
					$this->error(intval(round($thisfile_mpeg_audio['bitrate'] / 1000)).'kbps not allowed in Layer 2, '.$thisfile_mpeg_audio['channelmode'].'.');
					return false;
				}
				break;

		}

	}


	if ($info['audio']['sample_rate'] > 0) {
		$thisfile_mpeg_audio['framelength'] = self::MPEGaudioFrameLength($thisfile_mpeg_audio['bitrate'], $thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['layer'], (int) $thisfile_mpeg_audio['padding'], $info['audio']['sample_rate']);
	}

	$nextframetestoffset = $offset + 1;
	if ($thisfile_mpeg_audio['bitrate'] != 'free') {

		$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];

		if (isset($thisfile_mpeg_audio['framelength'])) {
			$nextframetestoffset = $offset + $thisfile_mpeg_audio['framelength'];
		} else {
			$this->error('Frame at offset('.$offset.') is has an invalid frame length.');
			return false;
		}

	}

	$ExpectedNumberOfAudioBytes = 0;

	////////////////////////////////////////////////////////////////////////////////////
	// Variable-bitrate headers

	if (substr($headerstring, 4 + 32, 4) == 'VBRI') {
		// Fraunhofer VBR header is hardcoded 'VBRI' at offset 0x24 (36)
		// specs taken from http://minnie.tuhs.org/pipermail/mp3encoder/2001-January/001800.html

		$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
		$thisfile_mpeg_audio['VBR_method']   = 'Fraunhofer';
		$info['audio']['codec']              = 'Fraunhofer';

		$SideInfoData = substr($headerstring, 4 + 2, 32);

		$FraunhoferVBROffset = 36;

		$thisfile_mpeg_audio['VBR_encoder_version']     = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  4, 2)); // VbriVersion
		$thisfile_mpeg_audio['VBR_encoder_delay']       = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  6, 2)); // VbriDelay
		$thisfile_mpeg_audio['VBR_quality']             = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset +  8, 2)); // VbriQuality
		$thisfile_mpeg_audio['VBR_bytes']               = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 10, 4)); // VbriStreamBytes
		$thisfile_mpeg_audio['VBR_frames']              = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 14, 4)); // VbriStreamFrames
		$thisfile_mpeg_audio['VBR_seek_offsets']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 18, 2)); // VbriTableSize
		$thisfile_mpeg_audio['VBR_seek_scale']          = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 20, 2)); // VbriTableScale
		$thisfile_mpeg_audio['VBR_entry_bytes']         = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 22, 2)); // VbriEntryBytes
		$thisfile_mpeg_audio['VBR_entry_frames']        = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset + 24, 2)); // VbriEntryFrames

		$ExpectedNumberOfAudioBytes = $thisfile_mpeg_audio['VBR_bytes'];

		$previousbyteoffset = $offset;
		for ($i = 0; $i < $thisfile_mpeg_audio['VBR_seek_offsets']; $i++) {
			$Fraunhofer_OffsetN = getid3_lib::BigEndian2Int(substr($headerstring, $FraunhoferVBROffset, $thisfile_mpeg_audio['VBR_entry_bytes']));
			$FraunhoferVBROffset += $thisfile_mpeg_audio['VBR_entry_bytes'];
			$thisfile_mpeg_audio['VBR_offsets_relative'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']);
			$thisfile_mpeg_audio['VBR_offsets_absolute'][$i] = ($Fraunhofer_OffsetN * $thisfile_mpeg_audio['VBR_seek_scale']) + $previousbyteoffset;
			$previousbyteoffset += $Fraunhofer_OffsetN;
		}


	} else {

		// Xing VBR header is hardcoded 'Xing' at a offset 0x0D (13), 0x15 (21) or 0x24 (36)
		// depending on MPEG layer and number of channels

		$VBRidOffset = self::XingVBRidOffset($thisfile_mpeg_audio['version'], $thisfile_mpeg_audio['channelmode']);
		$SideInfoData = substr($headerstring, 4 + 2, $VBRidOffset - 4);

		if ((substr($headerstring, $VBRidOffset, strlen('Xing')) == 'Xing') || (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Info')) {
			// 'Xing' is traditional Xing VBR frame
			// 'Info' is LAME-encoded CBR (This was done to avoid CBR files to be recognized as traditional Xing VBR files by some decoders.)
			// 'Info' *can* legally be used to specify a VBR file as well, however.

			// http://www.multiweb.cz/twoinches/MP3inside.htm
			//00..03 = "Xing" or "Info"
			//04..07 = Flags:
			//  0x01  Frames Flag     set if value for number of frames in file is stored
			//  0x02  Bytes Flag      set if value for filesize in bytes is stored
			//  0x04  TOC Flag        set if values for TOC are stored
			//  0x08  VBR Scale Flag  set if values for VBR scale is stored
			//08..11  Frames: Number of frames in file (including the first Xing/Info one)
			//12..15  Bytes:  File length in Bytes
			//16..115  TOC (Table of Contents):
			//  Contains of 100 indexes (one Byte length) for easier lookup in file. Approximately solves problem with moving inside file.
			//  Each Byte has a value according this formula:
			//  (TOC[i] / 256) * fileLenInBytes
			//  So if song lasts eg. 240 sec. and you want to jump to 60. sec. (and file is 5 000 000 Bytes length) you can use:
			//  TOC[(60/240)*100] = TOC[25]
			//  and corresponding Byte in file is then approximately at:
			//  (TOC[25]/256) * 5000000
			//116..119  VBR Scale


			// should be safe to leave this at 'vbr' and let it be overriden to 'cbr' if a CBR preset/mode is used by LAME
//				if (substr($headerstring, $VBRidOffset, strlen('Info')) == 'Xing') {
				$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
				$thisfile_mpeg_audio['VBR_method']   = 'Xing';
//				} else {
//					$ScanAsCBR = true;
//					$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
//				}

			$thisfile_mpeg_audio['xing_flags_raw'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 4, 4));

			$thisfile_mpeg_audio['xing_flags']['frames']    = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000001);
			$thisfile_mpeg_audio['xing_flags']['bytes']     = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000002);
			$thisfile_mpeg_audio['xing_flags']['toc']       = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000004);
			$thisfile_mpeg_audio['xing_flags']['vbr_scale'] = (bool) ($thisfile_mpeg_audio['xing_flags_raw'] & 0x00000008);

			if ($thisfile_mpeg_audio['xing_flags']['frames']) {
				$thisfile_mpeg_audio['VBR_frames'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset +  8, 4));
				//$thisfile_mpeg_audio['VBR_frames']--; // don't count header Xing/Info frame
			}
			if ($thisfile_mpeg_audio['xing_flags']['bytes']) {
				$thisfile_mpeg_audio['VBR_bytes']  = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 12, 4));
			}

			//if (($thisfile_mpeg_audio['bitrate'] == 'free') && !empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
			//if (!empty($thisfile_mpeg_audio['VBR_frames']) && !empty($thisfile_mpeg_audio['VBR_bytes'])) {
			if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
				$used_filesize  = 0;
				if (!empty($thisfile_mpeg_audio['VBR_bytes'])) {
					$used_filesize = $thisfile_mpeg_audio['VBR_bytes'];
				} elseif (!empty($info['filesize'])) {
					$used_filesize  = $info['filesize'];
					$used_filesize -= (isset($info['id3v2']['headerlength']) ? intval($info['id3v2']['headerlength']) : 0);
					$used_filesize -= (isset($info['id3v1']) ? 128 : 0);
					$used_filesize -= (isset($info['tag_offset_end']) ? $info['tag_offset_end'] - $info['tag_offset_start'] : 0);
					$this->warning('MP3.Xing header missing VBR_bytes, assuming MPEG audio portion of file is '.number_format($used_filesize).' bytes');
				}

				$framelengthfloat = $used_filesize / $thisfile_mpeg_audio['VBR_frames'];

				if ($thisfile_mpeg_audio['layer'] == '1') {
					// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
					//$info['audio']['bitrate'] = ((($framelengthfloat / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
					$info['audio']['bitrate'] = ($framelengthfloat / 4) * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 12;
				} else {
					// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
					//$info['audio']['bitrate'] = (($framelengthfloat - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
					$info['audio']['bitrate'] = $framelengthfloat * $thisfile_mpeg_audio['sample_rate'] * (2 / $info['audio']['channels']) / 144;
				}
				$thisfile_mpeg_audio['framelength'] = floor($framelengthfloat);
			}

			if ($thisfile_mpeg_audio['xing_flags']['toc']) {
				$LAMEtocData = substr($headerstring, $VBRidOffset + 16, 100);
				for ($i = 0; $i < 100; $i++) {
					$thisfile_mpeg_audio['toc'][$i] = ord($LAMEtocData[$i]);
				}
			}
			if ($thisfile_mpeg_audio['xing_flags']['vbr_scale']) {
				$thisfile_mpeg_audio['VBR_scale'] = getid3_lib::BigEndian2Int(substr($headerstring, $VBRidOffset + 116, 4));
			}


			// http://gabriel.mp3-tech.org/mp3infotag.html
			if (substr($headerstring, $VBRidOffset + 120, 4) == 'LAME') {

				// shortcut
				$thisfile_mpeg_audio['LAME'] = array();
				$thisfile_mpeg_audio_lame    = &$thisfile_mpeg_audio['LAME'];


				$thisfile_mpeg_audio_lame['long_version']  = substr($headerstring, $VBRidOffset + 120, 20);
				$thisfile_mpeg_audio_lame['short_version'] = substr($thisfile_mpeg_audio_lame['long_version'], 0, 9);
				$thisfile_mpeg_audio_lame['numeric_version'] = str_replace('LAME', '', $thisfile_mpeg_audio_lame['short_version']);
				if (preg_match('#^LAME([0-9\\.a-z]+)#', $thisfile_mpeg_audio_lame['long_version'], $matches)) {
					$thisfile_mpeg_audio_lame['short_version']   = $matches[0];
					$thisfile_mpeg_audio_lame['numeric_version'] = $matches[1];
				}
				foreach (explode('.', $thisfile_mpeg_audio_lame['numeric_version']) as $key => $number) {
					$thisfile_mpeg_audio_lame['integer_version'][$key] = intval($number);
				}

				//if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.90') {
				if ((($thisfile_mpeg_audio_lame['integer_version'][0] * 1000) + $thisfile_mpeg_audio_lame['integer_version'][1]) >= 3090) { // cannot use string version compare, may have "LAME3.90" or "LAME3.100" -- see https://github.com/JamesHeinrich/getID3/issues/207

					// extra 11 chars are not part of version string when LAMEtag present
					unset($thisfile_mpeg_audio_lame['long_version']);

					// It the LAME tag was only introduced in LAME v3.90
					// http://www.hydrogenaudio.org/?act=ST&f=15&t=9933

					// Offsets of various bytes in http://gabriel.mp3-tech.org/mp3infotag.html
					// are assuming a 'Xing' identifier offset of 0x24, which is the case for
					// MPEG-1 non-mono, but not for other combinations
					$LAMEtagOffsetContant = $VBRidOffset - 0x24;

					// shortcuts
					$thisfile_mpeg_audio_lame['RGAD']    = array('track'=>array(), 'album'=>array());
					$thisfile_mpeg_audio_lame_RGAD       = &$thisfile_mpeg_audio_lame['RGAD'];
					$thisfile_mpeg_audio_lame_RGAD_track = &$thisfile_mpeg_audio_lame_RGAD['track'];
					$thisfile_mpeg_audio_lame_RGAD_album = &$thisfile_mpeg_audio_lame_RGAD['album'];
					$thisfile_mpeg_audio_lame['raw'] = array();
					$thisfile_mpeg_audio_lame_raw    = &$thisfile_mpeg_audio_lame['raw'];

					// byte $9B  VBR Quality
					// This field is there to indicate a quality level, although the scale was not precised in the original Xing specifications.
					// Actually overwrites original Xing bytes
					unset($thisfile_mpeg_audio['VBR_scale']);
					$thisfile_mpeg_audio_lame['vbr_quality'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0x9B, 1));

					// bytes $9C-$A4  Encoder short VersionString
					$thisfile_mpeg_audio_lame['short_version'] = substr($headerstring, $LAMEtagOffsetContant + 0x9C, 9);

					// byte $A5  Info Tag revision + VBR method
					$LAMEtagRevisionVBRmethod = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA5, 1));

					$thisfile_mpeg_audio_lame['tag_revision']   = ($LAMEtagRevisionVBRmethod & 0xF0) >> 4;
					$thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod & 0x0F;
					$thisfile_mpeg_audio_lame['vbr_method']     = self::LAMEvbrMethodLookup($thisfile_mpeg_audio_lame_raw['vbr_method']);
					$thisfile_mpeg_audio['bitrate_mode']        = substr($thisfile_mpeg_audio_lame['vbr_method'], 0, 3); // usually either 'cbr' or 'vbr', but truncates 'vbr-old / vbr-rh' to 'vbr'

					// byte $A6  Lowpass filter value
					$thisfile_mpeg_audio_lame['lowpass_frequency'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA6, 1)) * 100;

					// bytes $A7-$AE  Replay Gain
					// http://privatewww.essex.ac.uk/~djmrob/replaygain/rg_data_format.html
					// bytes $A7-$AA : 32 bit floating point "Peak signal amplitude"
					if ($thisfile_mpeg_audio_lame['short_version'] >= 'LAME3.94b') {
						// LAME 3.94a16 and later - 9.23 fixed point
						// ie 0x0059E2EE / (2^23) = 5890798 / 8388608 = 0.7022378444671630859375
						$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = (float) ((getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4))) / 8388608);
					} else {
						// LAME 3.94a15 and earlier - 32-bit floating point
						// Actually 3.94a16 will fall in here too and be WRONG, but is hard to detect 3.94a16 vs 3.94a15
						$thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] = getid3_lib::LittleEndian2Float(substr($headerstring, $LAMEtagOffsetContant + 0xA7, 4));
					}
					if ($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'] == 0) {
						unset($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
					} else {
						$thisfile_mpeg_audio_lame_RGAD['peak_db'] = getid3_lib::RGADamplitude2dB($thisfile_mpeg_audio_lame_RGAD['peak_amplitude']);
					}

					$thisfile_mpeg_audio_lame_raw['RGAD_track']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAB, 2));
					$thisfile_mpeg_audio_lame_raw['RGAD_album']      =   getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAD, 2));


					if ($thisfile_mpeg_audio_lame_raw['RGAD_track'] != 0) {

						$thisfile_mpeg_audio_lame_RGAD_track['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0xE000) >> 13;
						$thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x1C00) >> 10;
						$thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x0200) >> 9;
						$thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'] =  $thisfile_mpeg_audio_lame_raw['RGAD_track'] & 0x01FF;
						$thisfile_mpeg_audio_lame_RGAD_track['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['name']);
						$thisfile_mpeg_audio_lame_RGAD_track['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['originator']);
						$thisfile_mpeg_audio_lame_RGAD_track['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_track['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_track['raw']['sign_bit']);

						if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
							$info['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
						}
						$info['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
						$info['replay_gain']['track']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_track['gain_db'];
					} else {
						unset($thisfile_mpeg_audio_lame_RGAD['track']);
					}
					if ($thisfile_mpeg_audio_lame_raw['RGAD_album'] != 0) {

						$thisfile_mpeg_audio_lame_RGAD_album['raw']['name']        = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0xE000) >> 13;
						$thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']  = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x1C00) >> 10;
						$thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']    = ($thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x0200) >> 9;
						$thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'] = $thisfile_mpeg_audio_lame_raw['RGAD_album'] & 0x01FF;
						$thisfile_mpeg_audio_lame_RGAD_album['name']       = getid3_lib::RGADnameLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['name']);
						$thisfile_mpeg_audio_lame_RGAD_album['originator'] = getid3_lib::RGADoriginatorLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['originator']);
						$thisfile_mpeg_audio_lame_RGAD_album['gain_db']    = getid3_lib::RGADadjustmentLookup($thisfile_mpeg_audio_lame_RGAD_album['raw']['gain_adjust'], $thisfile_mpeg_audio_lame_RGAD_album['raw']['sign_bit']);

						if (!empty($thisfile_mpeg_audio_lame_RGAD['peak_amplitude'])) {
							$info['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
						}
						$info['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
						$info['replay_gain']['album']['adjustment'] = $thisfile_mpeg_audio_lame_RGAD_album['gain_db'];
					} else {
						unset($thisfile_mpeg_audio_lame_RGAD['album']);
					}
					if (empty($thisfile_mpeg_audio_lame_RGAD)) {
						unset($thisfile_mpeg_audio_lame['RGAD']);
					}


					// byte $AF  Encoding flags + ATH Type
					$EncodingFlagsATHtype = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xAF, 1));
					$thisfile_mpeg_audio_lame['encoding_flags']['nspsytune']   = (bool) ($EncodingFlagsATHtype & 0x10);
					$thisfile_mpeg_audio_lame['encoding_flags']['nssafejoint'] = (bool) ($EncodingFlagsATHtype & 0x20);
					$thisfile_mpeg_audio_lame['encoding_flags']['nogap_next']  = (bool) ($EncodingFlagsATHtype & 0x40);
					$thisfile_mpeg_audio_lame['encoding_flags']['nogap_prev']  = (bool) ($EncodingFlagsATHtype & 0x80);
					$thisfile_mpeg_audio_lame['ath_type']                      =         $EncodingFlagsATHtype & 0x0F;

					// byte $B0  if ABR {specified bitrate} else {minimal bitrate}
					$thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB0, 1));
					if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 2) { // Average BitRate (ABR)
						$thisfile_mpeg_audio_lame['bitrate_abr'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
					} elseif ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) { // Constant BitRate (CBR)
						// ignore
					} elseif ($thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'] > 0) { // Variable BitRate (VBR) - minimum bitrate
						$thisfile_mpeg_audio_lame['bitrate_min'] = $thisfile_mpeg_audio_lame['raw']['abrbitrate_minbitrate'];
					}

					// bytes $B1-$B3  Encoder delays
					$EncoderDelays = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB1, 3));
					$thisfile_mpeg_audio_lame['encoder_delay'] = ($EncoderDelays & 0xFFF000) >> 12;
					$thisfile_mpeg_audio_lame['end_padding']   =  $EncoderDelays & 0x000FFF;

					// byte $B4  Misc
					$MiscByte = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB4, 1));
					$thisfile_mpeg_audio_lame_raw['noise_shaping']       = ($MiscByte & 0x03);
					$thisfile_mpeg_audio_lame_raw['stereo_mode']         = ($MiscByte & 0x1C) >> 2;
					$thisfile_mpeg_audio_lame_raw['not_optimal_quality'] = ($MiscByte & 0x20) >> 5;
					$thisfile_mpeg_audio_lame_raw['source_sample_freq']  = ($MiscByte & 0xC0) >> 6;
					$thisfile_mpeg_audio_lame['noise_shaping']       = $thisfile_mpeg_audio_lame_raw['noise_shaping'];
					$thisfile_mpeg_audio_lame['stereo_mode']         = self::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
					$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
					$thisfile_mpeg_audio_lame['source_sample_freq']  = self::LAMEmiscSourceSampleFrequencyLookup($thisfile_mpeg_audio_lame_raw['source_sample_freq']);

					// byte $B5  MP3 Gain
					$thisfile_mpeg_audio_lame_raw['mp3_gain'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB5, 1), false, true);
					$thisfile_mpeg_audio_lame['mp3_gain_db']     = (getid3_lib::RGADamplitude2dB(2) / 4) * $thisfile_mpeg_audio_lame_raw['mp3_gain'];
					$thisfile_mpeg_audio_lame['mp3_gain_factor'] = pow(2, ($thisfile_mpeg_audio_lame['mp3_gain_db'] / 6));

					// bytes $B6-$B7  Preset and surround info
					$PresetSurroundBytes = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB6, 2));
					// Reserved                                                    = ($PresetSurroundBytes & 0xC000);
					$thisfile_mpeg_audio_lame_raw['surround_info'] = ($PresetSurroundBytes & 0x3800);
					$thisfile_mpeg_audio_lame['surround_info']     = self::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
					$thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes & 0x07FF);
					$thisfile_mpeg_audio_lame['preset_used']       = self::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
					if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
						$this->warning('Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to info@getid3.org');
					}
					if (($thisfile_mpeg_audio_lame['short_version'] == 'LAME3.90.') && !empty($thisfile_mpeg_audio_lame['preset_used_id'])) {
						// this may change if 3.90.4 ever comes out
						$thisfile_mpeg_audio_lame['short_version'] = 'LAME3.90.3';
					}

					// bytes $B8-$BB  MusicLength
					$thisfile_mpeg_audio_lame['audio_bytes'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xB8, 4));
					$ExpectedNumberOfAudioBytes = (($thisfile_mpeg_audio_lame['audio_bytes'] > 0) ? $thisfile_mpeg_audio_lame['audio_bytes'] : $thisfile_mpeg_audio['VBR_bytes']);

					// bytes $BC-$BD  MusicCRC
					$thisfile_mpeg_audio_lame['music_crc']    = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBC, 2));

					// bytes $BE-$BF  CRC-16 of Info Tag
					$thisfile_mpeg_audio_lame['lame_tag_crc'] = getid3_lib::BigEndian2Int(substr($headerstring, $LAMEtagOffsetContant + 0xBE, 2));


					// LAME CBR
					if ($thisfile_mpeg_audio_lame_raw['vbr_method'] == 1) {

						$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
						$thisfile_mpeg_audio['bitrate'] = self::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
						$info['audio']['bitrate'] = $thisfile_mpeg_audio['bitrate'];
						//if (empty($thisfile_mpeg_audio['bitrate']) || (!empty($thisfile_mpeg_audio_lame['bitrate_min']) && ($thisfile_mpeg_audio_lame['bitrate_min'] != 255))) {
						//	$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio_lame['bitrate_min'];
						//}

					}

				}
			}

		} else {

			// not Fraunhofer or Xing VBR methods, most likely CBR (but could be VBR with no header)
			$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
			if ($recursivesearch) {
				$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
				if ($this->RecursiveFrameScanning($offset, $nextframetestoffset, true)) {
					$recursivesearch = false;
					$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
				}
				if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
					$this->warning('VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.');
				}
			}

		}

	}

	if (($ExpectedNumberOfAudioBytes > 0) && ($ExpectedNumberOfAudioBytes != ($info['avdataend'] - $info['avdataoffset']))) {
		if ($ExpectedNumberOfAudioBytes > ($info['avdataend'] - $info['avdataoffset'])) {
			if ($this->isDependencyFor('matroska') || $this->isDependencyFor('riff')) {
				// ignore, audio data is broken into chunks so will always be data "missing"
			}
			elseif (($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])) == 1) {
				$this->warning('Last byte of data truncated (this is a known bug in Meracl ID3 Tag Writer before v1.3.5)');
			}
			else {
				$this->warning('Probable truncated file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, only found '.($info['avdataend'] - $info['avdataoffset']).' (short by '.($ExpectedNumberOfAudioBytes - ($info['avdataend'] - $info['avdataoffset'])).' bytes)');
			}
		} else {
			if ((($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes) == 1) {
			//	$prenullbytefileoffset = $this->ftell();
			//	$this->fseek($info['avdataend']);
			//	$PossibleNullByte = $this->fread(1);
			//	$this->fseek($prenullbytefileoffset);
			//	if ($PossibleNullByte === "\x00") {
					$info['avdataend']--;
			//		$this->warning('Extra null byte at end of MP3 data assumed to be RIFF padding and therefore ignored');
			//	} else {
			//		$this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
			//	}
			} else {
				$this->warning('Too much data in file: expecting '.$ExpectedNumberOfAudioBytes.' bytes of audio data, found '.($info['avdataend'] - $info['avdataoffset']).' ('.(($info['avdataend'] - $info['avdataoffset']) - $ExpectedNumberOfAudioBytes).' bytes too many)');
			}
		}
	}

	if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($info['audio']['bitrate'])) {
		if (($offset == $info['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
			$framebytelength = $this->FreeFormatFrameLength($offset, true);
			if ($framebytelength > 0) {
				$thisfile_mpeg_audio['framelength'] = $framebytelength;
				if ($thisfile_mpeg_audio['layer'] == '1') {
					// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
					$info['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
				} else {
					// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
					$info['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
				}
			} else {
				$this->error('Error calculating frame length of free-format MP3 without Xing/LAME header');
			}
		}
	}

	if (isset($thisfile_mpeg_audio['VBR_frames']) ? $thisfile_mpeg_audio['VBR_frames'] : '') {
		switch ($thisfile_mpeg_audio['bitrate_mode']) {
			case 'vbr':
			case 'abr':
				$bytes_per_frame = 1152;
				if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
					$bytes_per_frame = 384;
				} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
					$bytes_per_frame = 576;
				}
				$thisfile_mpeg_audio['VBR_bitrate'] = (isset($thisfile_mpeg_audio['VBR_bytes']) ? (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($info['audio']['sample_rate'] / $bytes_per_frame) : 0);
				if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
					$info['audio']['bitrate']       = $thisfile_mpeg_audio['VBR_bitrate'];
					$thisfile_mpeg_audio['bitrate'] = $thisfile_mpeg_audio['VBR_bitrate']; // to avoid confusion
				}
				break;
		}
	}

	// End variable-bitrate headers
	////////////////////////////////////////////////////////////////////////////////////

	if ($recursivesearch) {

		if (!$this->RecursiveFrameScanning($offset, $nextframetestoffset, $ScanAsCBR)) {
			return false;
		}

	}


	//if (false) {
	//    // experimental side info parsing section - not returning anything useful yet
	//
	//    $SideInfoBitstream = getid3_lib::BigEndian2Bin($SideInfoData);
	//    $SideInfoOffset = 0;
	//
	//    if ($thisfile_mpeg_audio['version'] == '1') {
	//        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
	//            // MPEG-1 (mono)
	//            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
	//            $SideInfoOffset += 9;
	//            $SideInfoOffset += 5;
	//        } else {
	//            // MPEG-1 (stereo, joint-stereo, dual-channel)
	//            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 9);
	//            $SideInfoOffset += 9;
	//            $SideInfoOffset += 3;
	//        }
	//    } else { // 2 or 2.5
	//        if ($thisfile_mpeg_audio['channelmode'] == 'mono') {
	//            // MPEG-2, MPEG-2.5 (mono)
	//            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
	//            $SideInfoOffset += 8;
	//            $SideInfoOffset += 1;
	//        } else {
	//            // MPEG-2, MPEG-2.5 (stereo, joint-stereo, dual-channel)
	//            $thisfile_mpeg_audio['side_info']['main_data_begin'] = substr($SideInfoBitstream, $SideInfoOffset, 8);
	//            $SideInfoOffset += 8;
	//            $SideInfoOffset += 2;
	//        }
	//    }
	//
	//    if ($thisfile_mpeg_audio['version'] == '1') {
	//        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
	//            for ($scfsi_band = 0; $scfsi_band < 4; $scfsi_band++) {
	//                $thisfile_mpeg_audio['scfsi'][$channel][$scfsi_band] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//                $SideInfoOffset += 2;
	//            }
	//        }
	//    }
	//    for ($granule = 0; $granule < (($thisfile_mpeg_audio['version'] == '1') ? 2 : 1); $granule++) {
	//        for ($channel = 0; $channel < $info['audio']['channels']; $channel++) {
	//            $thisfile_mpeg_audio['part2_3_length'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 12);
	//            $SideInfoOffset += 12;
	//            $thisfile_mpeg_audio['big_values'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
	//            $SideInfoOffset += 9;
	//            $thisfile_mpeg_audio['global_gain'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 8);
	//            $SideInfoOffset += 8;
	//            if ($thisfile_mpeg_audio['version'] == '1') {
	//                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
	//                $SideInfoOffset += 4;
	//            } else {
	//                $thisfile_mpeg_audio['scalefac_compress'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 9);
	//                $SideInfoOffset += 9;
	//            }
	//            $thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//            $SideInfoOffset += 1;
	//
	//            if ($thisfile_mpeg_audio['window_switching_flag'][$granule][$channel] == '1') {
	//
	//                $thisfile_mpeg_audio['block_type'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 2);
	//                $SideInfoOffset += 2;
	//                $thisfile_mpeg_audio['mixed_block_flag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//                $SideInfoOffset += 1;
	//
	//                for ($region = 0; $region < 2; $region++) {
	//                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
	//                    $SideInfoOffset += 5;
	//                }
	//                $thisfile_mpeg_audio['table_select'][$granule][$channel][2] = 0;
	//
	//                for ($window = 0; $window < 3; $window++) {
	//                    $thisfile_mpeg_audio['subblock_gain'][$granule][$channel][$window] = substr($SideInfoBitstream, $SideInfoOffset, 3);
	//                    $SideInfoOffset += 3;
	//                }
	//
	//            } else {
	//
	//                for ($region = 0; $region < 3; $region++) {
	//                    $thisfile_mpeg_audio['table_select'][$granule][$channel][$region] = substr($SideInfoBitstream, $SideInfoOffset, 5);
	//                    $SideInfoOffset += 5;
	//                }
	//
	//                $thisfile_mpeg_audio['region0_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 4);
	//                $SideInfoOffset += 4;
	//                $thisfile_mpeg_audio['region1_count'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 3);
	//                $SideInfoOffset += 3;
	//                $thisfile_mpeg_audio['block_type'][$granule][$channel] = 0;
	//            }
	//
	//            if ($thisfile_mpeg_audio['version'] == '1') {
	//                $thisfile_mpeg_audio['preflag'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//                $SideInfoOffset += 1;
	//            }
	//            $thisfile_mpeg_audio['scalefac_scale'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//            $SideInfoOffset += 1;
	//            $thisfile_mpeg_audio['count1table_select'][$granule][$channel] = substr($SideInfoBitstream, $SideInfoOffset, 1);
	//            $SideInfoOffset += 1;
	//        }
	//    }
	//}

	return true;
}