module.audio.mp3.php

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						$thisfile_mpeg_audio_lame_raw['vbr_method'] =  $LAMEtagRevisionVBRmethod & 0x0F;
						$thisfile_mpeg_audio_lame['vbr_method']        = getid3_mp3::LAMEvbrMethodLookup($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'])) {
								$ThisFileInfo['replay_gain']['track']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
							}
							$ThisFileInfo['replay_gain']['track']['originator'] = $thisfile_mpeg_audio_lame_RGAD_track['originator'];
							$ThisFileInfo['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'])) {
								$ThisFileInfo['replay_gain']['album']['peak']   = $thisfile_mpeg_audio_lame_RGAD['peak_amplitude'];
							}
							$ThisFileInfo['replay_gain']['album']['originator'] = $thisfile_mpeg_audio_lame_RGAD_album['originator'];
							$ThisFileInfo['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'];
						$thisfile_mpeg_audio_lame['stereo_mode']         = getid3_mp3::LAMEmiscStereoModeLookup($thisfile_mpeg_audio_lame_raw['stereo_mode']);
						$thisfile_mpeg_audio_lame['not_optimal_quality'] = (bool) $thisfile_mpeg_audio_lame_raw['not_optimal_quality'];
						$thisfile_mpeg_audio_lame['source_sample_freq']  = getid3_mp3::LAMEmiscSourceSampleFrequencyLookup($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);
						$thisfile_mpeg_audio_lame['surround_info']     = getid3_mp3::LAMEsurroundInfoLookup($thisfile_mpeg_audio_lame_raw['surround_info']);
						$thisfile_mpeg_audio_lame['preset_used_id']    = ($PresetSurroundBytes & 0x07FF);
						$thisfile_mpeg_audio_lame['preset_used']       = getid3_mp3::LAMEpresetUsedLookup($thisfile_mpeg_audio_lame);
						if (!empty($thisfile_mpeg_audio_lame['preset_used_id']) && empty($thisfile_mpeg_audio_lame['preset_used'])) {
							$ThisFileInfo['warning'][] = 'Unknown LAME preset used ('.$thisfile_mpeg_audio_lame['preset_used_id'].') - please report to [e-mail]';
						}
						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';
							$thisfile_mpeg_audio['bitrate'] = getid3_mp3::ClosestStandardMP3Bitrate($thisfile_mpeg_audio['bitrate']);
							$ThisFileInfo['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) {
					$thisfile_mpeg_audio['bitrate_mode'] = 'vbr';
					if (getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, true)) {
						$recursivesearch = false;
						$thisfile_mpeg_audio['bitrate_mode'] = 'cbr';
					}
					if ($thisfile_mpeg_audio['bitrate_mode'] == 'vbr') {
						$ThisFileInfo['warning'][] = 'VBR file with no VBR header. Bitrate values calculated from actual frame bitrates.';
					}
				}

			}

		}

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

		if (($thisfile_mpeg_audio['bitrate'] == 'free') && empty($ThisFileInfo['audio']['bitrate'])) {
			if (($offset == $ThisFileInfo['avdataoffset']) && empty($thisfile_mpeg_audio['VBR_frames'])) {
				$framebytelength = getid3_mp3::FreeFormatFrameLength($fd, $offset, $ThisFileInfo, true);
				if ($framebytelength > 0) {
					$thisfile_mpeg_audio['framelength'] = $framebytelength;
					if ($thisfile_mpeg_audio['layer'] == '1') {
						// BitRate = (((FrameLengthInBytes / 4) - Padding) * SampleRate) / 12
						$ThisFileInfo['audio']['bitrate'] = ((($framebytelength / 4) - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 12;
					} else {
						// Bitrate = ((FrameLengthInBytes - Padding) * SampleRate) / 144
						$ThisFileInfo['audio']['bitrate'] = (($framebytelength - intval($thisfile_mpeg_audio['padding'])) * $thisfile_mpeg_audio['sample_rate']) / 144;
					}
				} else {
					$ThisFileInfo['error'][] = 'Error calculating frame length of free-format MP3 without Xing/LAME header';
				}
			}
		}

		if (!empty($thisfile_mpeg_audio['VBR_frames'])) {
			switch ($thisfile_mpeg_audio['bitrate_mode']) {
				case 'vbr':
				case 'abr':
					if (($thisfile_mpeg_audio['version'] == '1') && ($thisfile_mpeg_audio['layer'] == 1)) {
						$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 384);
					} elseif ((($thisfile_mpeg_audio['version'] == '2') || ($thisfile_mpeg_audio['version'] == '2.5')) && ($thisfile_mpeg_audio['layer'] == 3)) {
						$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 576);
					} else {
						$thisfile_mpeg_audio['VBR_bitrate'] = (($thisfile_mpeg_audio['VBR_bytes'] / $thisfile_mpeg_audio['VBR_frames']) * 8) * ($ThisFileInfo['audio']['sample_rate'] / 1152);
					}
					if ($thisfile_mpeg_audio['VBR_bitrate'] > 0) {
						$ThisFileInfo['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 (!getid3_mp3::RecursiveFrameScanning($fd, $ThisFileInfo, $offset, $nextframetestoffset, $ScanAsCBR)) {
				return false;
			}