+global\getid3_mp3::getOnlyMPEGaudioInfoBruteForce()

Complexity

Conditions	27
Paths	11808

Size

Total Lines	146
Code Lines	111

Duplication

Lines	6
Ratio	4.11 %

Importance

Changes

0

<?php
	public function getOnlyMPEGaudioInfoBruteForce() {
		$MPEGaudioHeaderDecodeCache   = array();
		$MPEGaudioHeaderValidCache    = array();
		$MPEGaudioHeaderLengthCache   = array();
		$MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();
		$MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();
		$MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();
		$MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();
		$MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();
		$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();
		$MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();
		$LongMPEGversionLookup        = array();
		$LongMPEGlayerLookup          = array();
		$LongMPEGbitrateLookup        = array();
		$LongMPEGpaddingLookup        = array();
		$LongMPEGfrequencyLookup      = array();
		$Distribution['bitrate']      = array();

$Distribution was never initialized. Although not strictly required by PHP, it is generally a good practice to add $Distribution = array(); before regardless.

		$Distribution['frequency']    = array();
		$Distribution['layer']        = array();
		$Distribution['version']      = array();
		$Distribution['padding']      = array();

		$info = &$this->getid3->info;
		$this->fseek($info['avdataoffset']);

		$max_frames_scan = 5000;
		$frames_scanned  = 0;

		$previousvalidframe = $info['avdataoffset'];
		while ($this->ftell() < $info['avdataend']) {
			set_time_limit(30);
			$head4 = $this->fread(4);
			if (strlen($head4) < 4) {
				break;
			}
			if ($head4{0} != "\xFF") {
				for ($i = 1; $i < 4; $i++) {
					if ($head4{$i} == "\xFF") {
						$this->fseek($i - 4, SEEK_CUR);
						continue 2;
					}
				}
				continue;
			}
			if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {
				$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);
			}
			if (!isset($MPEGaudioHeaderValidCache[$head4])) {
				$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);
			}
			if ($MPEGaudioHeaderValidCache[$head4]) {

				if (!isset($MPEGaudioHeaderLengthCache[$head4])) {
					$LongMPEGversionLookup[$head4]   = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];
					$LongMPEGlayerLookup[$head4]     = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];
					$LongMPEGbitrateLookup[$head4]   = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];
					$LongMPEGpaddingLookup[$head4]   = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];
					$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];
					$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(
						$LongMPEGbitrateLookup[$head4],
						$LongMPEGversionLookup[$head4],
						$LongMPEGlayerLookup[$head4],
						$LongMPEGpaddingLookup[$head4],
						$LongMPEGfrequencyLookup[$head4]);
				}
				if ($MPEGaudioHeaderLengthCache[$head4] > 4) {
					$WhereWeWere = $this->ftell();
					$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);
					$next4 = $this->fread(4);
					if ($next4{0} == "\xFF") {
						if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {
							$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);
						}
						if (!isset($MPEGaudioHeaderValidCache[$next4])) {
							$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);
						}
						if ($MPEGaudioHeaderValidCache[$next4]) {
							$this->fseek(-4, SEEK_CUR);

							getid3_lib::safe_inc($Distribution['bitrate'][$LongMPEGbitrateLookup[$head4]]);
							getid3_lib::safe_inc($Distribution['layer'][$LongMPEGlayerLookup[$head4]]);
							getid3_lib::safe_inc($Distribution['version'][$LongMPEGversionLookup[$head4]]);
							getid3_lib::safe_inc($Distribution['padding'][intval($LongMPEGpaddingLookup[$head4])]);
							getid3_lib::safe_inc($Distribution['frequency'][$LongMPEGfrequencyLookup[$head4]]);
							if ($max_frames_scan && (++$frames_scanned >= $max_frames_scan)) {
								$pct_data_scanned = ($this->ftell() - $info['avdataoffset']) / ($info['avdataend'] - $info['avdataoffset']);
								$info['warning'][] = 'too many MPEG audio frames to scan, only scanned first '.$max_frames_scan.' frames ('.number_format($pct_data_scanned * 100, 1).'% of file) and extrapolated distribution, playtime and bitrate may be incorrect.';
								foreach ($Distribution as $key1 => $value1) {
									foreach ($value1 as $key2 => $value2) {
										$Distribution[$key1][$key2] = round($value2 / $pct_data_scanned);
									}
								}
								break;
							}
							continue;
						}
					}
					unset($next4);
					$this->fseek($WhereWeWere - 3);
				}

			}
		}
		foreach ($Distribution as $key => $value) {
			ksort($Distribution[$key], SORT_NUMERIC);
		}
		ksort($Distribution['version'], SORT_STRING);
		$info['mpeg']['audio']['bitrate_distribution']   = $Distribution['bitrate'];
		$info['mpeg']['audio']['frequency_distribution'] = $Distribution['frequency'];
		$info['mpeg']['audio']['layer_distribution']     = $Distribution['layer'];
		$info['mpeg']['audio']['version_distribution']   = $Distribution['version'];
		$info['mpeg']['audio']['padding_distribution']   = $Distribution['padding'];
		if (count($Distribution['version']) > 1) {
			$info['error'][] = 'Corrupt file - more than one MPEG version detected';
		}
		if (count($Distribution['layer']) > 1) {
			$info['error'][] = 'Corrupt file - more than one MPEG layer detected';
		}
		if (count($Distribution['frequency']) > 1) {
			$info['error'][] = 'Corrupt file - more than one MPEG sample rate detected';
		}


		$bittotal = 0;
		foreach ($Distribution['bitrate'] as $bitratevalue => $bitratecount) {
			if ($bitratevalue != 'free') {
				$bittotal += ($bitratevalue * $bitratecount);
			}
		}
		$info['mpeg']['audio']['frame_count']  = array_sum($Distribution['bitrate']);
		if ($info['mpeg']['audio']['frame_count'] == 0) {
			$info['error'][] = 'no MPEG audio frames found';
			return false;
		}
		$info['mpeg']['audio']['bitrate']      = ($bittotal / $info['mpeg']['audio']['frame_count']);
		$info['mpeg']['audio']['bitrate_mode'] = ((count($Distribution['bitrate']) > 0) ? 'vbr' : 'cbr');
		$info['mpeg']['audio']['sample_rate']  = getid3_lib::array_max($Distribution['frequency'], true);

		$info['audio']['bitrate']      = $info['mpeg']['audio']['bitrate'];
		$info['audio']['bitrate_mode'] = $info['mpeg']['audio']['bitrate_mode'];
		$info['audio']['sample_rate']  = $info['mpeg']['audio']['sample_rate'];
		$info['audio']['dataformat']   = 'mp'.getid3_lib::array_max($Distribution['layer'], true);
		$info['fileformat']            = $info['audio']['dataformat'];

		return true;
	}