getid3_mp3::Analyze(): bool

44	public function Analyze() {45		$info = &$this->getid3->info;46 47		$initialOffset = $info['avdataoffset'];48 49		if (!$this->getOnlyMPEGaudioInfo($info['avdataoffset'])) {50			if ($this->allow_bruteforce) {51				$this->error('Rescanning file in BruteForce mode');52				$this->getOnlyMPEGaudioInfoBruteForce();53			}54		}55 56 57		if (isset($info['mpeg']['audio']['bitrate_mode'])) {58			$info['audio']['bitrate_mode'] = strtolower($info['mpeg']['audio']['bitrate_mode']);59		}60 61		$CurrentDataLAMEversionString = null;62		if (((isset($info['id3v2']['headerlength']) && ($info['avdataoffset'] > $info['id3v2']['headerlength'])) || (!isset($info['id3v2']) && ($info['avdataoffset'] > 0) && ($info['avdataoffset'] != $initialOffset)))) {63 64			$synchoffsetwarning = 'Unknown data before synch ';65			if (isset($info['id3v2']['headerlength'])) {66				$synchoffsetwarning .= '(ID3v2 header ends at '.$info['id3v2']['headerlength'].', then '.($info['avdataoffset'] - $info['id3v2']['headerlength']).' bytes garbage, ';67			} elseif ($initialOffset > 0) {68				$synchoffsetwarning .= '(should be at '.$initialOffset.', ';69			} else {70				$synchoffsetwarning .= '(should be at beginning of file, ';71			}72			$synchoffsetwarning .= 'synch detected at '.$info['avdataoffset'].')';73			if (isset($info['audio']['bitrate_mode']) && ($info['audio']['bitrate_mode'] == 'cbr')) {74 75				if (!empty($info['id3v2']['headerlength']) && (($info['avdataoffset'] - $info['id3v2']['headerlength']) == $info['mpeg']['audio']['framelength'])) {76 77					$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90-3.92) DLL in CBR mode.';78					$info['audio']['codec'] = 'LAME';79					$CurrentDataLAMEversionString = 'LAME3.';80 81				} elseif (empty($info['id3v2']['headerlength']) && ($info['avdataoffset'] == $info['mpeg']['audio']['framelength'])) {82 83					$synchoffsetwarning .= '. This is a known problem with some versions of LAME (3.90 - 3.92) DLL in CBR mode.';84					$info['audio']['codec'] = 'LAME';85					$CurrentDataLAMEversionString = 'LAME3.';86 87				}88 89			}90			$this->warning($synchoffsetwarning);91 92		}93 94		if (isset($info['mpeg']['audio']['LAME'])) {95			$info['audio']['codec'] = 'LAME';96			if (!empty($info['mpeg']['audio']['LAME']['long_version'])) {97				$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['long_version'], "\x00");98			} elseif (!empty($info['mpeg']['audio']['LAME']['short_version'])) {99				$info['audio']['encoder'] = rtrim($info['mpeg']['audio']['LAME']['short_version'], "\x00");100			}101		}102 103		$CurrentDataLAMEversionString = (!empty($CurrentDataLAMEversionString) ? $CurrentDataLAMEversionString : (isset($info['audio']['encoder']) ? $info['audio']['encoder'] : ''));104		if (!empty($CurrentDataLAMEversionString) && (substr($CurrentDataLAMEversionString, 0, 6) == 'LAME3.') && !preg_match('[0-9\)]', substr($CurrentDataLAMEversionString, -1))) {105			// a version number of LAME that does not end with a number like "LAME3.92"106			// or with a closing parenthesis like "LAME3.88 (alpha)"107			// or a version of LAME with the LAMEtag-not-filled-in-DLL-mode bug (3.90-3.92)108 109			// not sure what the actual last frame length will be, but will be less than or equal to 1441110			$PossiblyLongerLAMEversion_FrameLength = 1441;111 112			// Not sure what version of LAME this is - look in padding of last frame for longer version string113			$PossibleLAMEversionStringOffset = $info['avdataend'] - $PossiblyLongerLAMEversion_FrameLength;114			$this->fseek($PossibleLAMEversionStringOffset);115			$PossiblyLongerLAMEversion_Data = $this->fread($PossiblyLongerLAMEversion_FrameLength);116			switch (substr($CurrentDataLAMEversionString, -1)) {117				case 'a':118				case 'b':119					// "LAME3.94a" will have a longer version string of "LAME3.94 (alpha)" for example120					// need to trim off "a" to match longer string121					$CurrentDataLAMEversionString = substr($CurrentDataLAMEversionString, 0, -1);122					break;123			}