getid3_mp3::getOnlyMPEGaudioInfoBruteForce(): bool

1297	public function getOnlyMPEGaudioInfoBruteForce() {1298		$MPEGaudioHeaderDecodeCache   = array();1299		$MPEGaudioHeaderValidCache    = array();1300		$MPEGaudioHeaderLengthCache   = array();1301		$MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();1302		$MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();1303		$MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();1304		$MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();1305		$MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();1306		$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();1307		$MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();1308		$LongMPEGversionLookup        = array();1309		$LongMPEGlayerLookup          = array();1310		$LongMPEGbitrateLookup        = array();1311		$LongMPEGpaddingLookup        = array();1312		$LongMPEGfrequencyLookup      = array();1313		$Distribution                 = array();1314		$Distribution['bitrate']      = array();1315		$Distribution['frequency']    = array();1316		$Distribution['layer']        = array();1317		$Distribution['version']      = array();1318		$Distribution['padding']      = array();1319 1320		$info = &$this->getid3->info;1321		$this->fseek($info['avdataoffset']);1322 1323		$max_frames_scan = 5000;1324		$frames_scanned  = 0;1325 1326		$previousvalidframe = $info['avdataoffset'];1327		while ($this->ftell() < $info['avdataend']) {1328			set_time_limit(30);1329			$head4 = $this->fread(4);1330			if (strlen($head4) < 4) {1331				break;1332			}1333			if ($head4[0] != "\xFF") {1334				for ($i = 1; $i < 4; $i++) {1335					if ($head4[$i] == "\xFF") {1336						$this->fseek($i - 4, SEEK_CUR);1337						continue 2;1338					}1339				}1340				continue;1341			}1342			if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {1343				$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);1344			}1345			if (!isset($MPEGaudioHeaderValidCache[$head4])) {1346				$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);1347			}1348			if ($MPEGaudioHeaderValidCache[$head4]) {1349 1350				if (!isset($MPEGaudioHeaderLengthCache[$head4])) {1351					$LongMPEGversionLookup[$head4]   = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];1352					$LongMPEGlayerLookup[$head4]     = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];1353					$LongMPEGbitrateLookup[$head4]   = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];1354					$LongMPEGpaddingLookup[$head4]   = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];1355					$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];1356					$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(1357						$LongMPEGbitrateLookup[$head4],1358						$LongMPEGversionLookup[$head4],1359						$LongMPEGlayerLookup[$head4],1360						$LongMPEGpaddingLookup[$head4],1361						$LongMPEGfrequencyLookup[$head4]);1362				}1363				if ($MPEGaudioHeaderLengthCache[$head4] > 4) {1364					$WhereWeWere = $this->ftell();1365					$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);1366					$next4 = $this->fread(4);1367					if ($next4[0] == "\xFF") {1368						if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {1369							$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);1370						}1371						if (!isset($MPEGaudioHeaderValidCache[$next4])) {1372							$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);1373						}1374						if ($MPEGaudioHeaderValidCache[$next4]) {1375							$this->fseek(-4, SEEK_CUR);1376