getid3_mp3::getOnlyMPEGaudioInfoBruteForce(): bool

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Return value

bool

Performance profile

How much work a call to getid3_mp3::getOnlyMPEGaudioInfoBruteForce() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Light

Touches nothing outside its own arguments.

Scaling

Scales with input

The body loops, so the work grows with how much data it finds.

Instructions

124–312

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 467.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

1

1 place in core call this, so the cost is paid more often than your own code shows.

What one call costs · 16 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost getid3_mp3::getOnlyMPEGaudioInfoBruteForce() can have, taken from its control-flow graph on PHP 8.5.

This body has more branch combinations than are worth enumerating, so the table covers the outcomes found first rather than every one that exists.

Uses · 17

• getid3_mp3::MPEGaudioVersionArray()
• getid3_mp3::MPEGaudioLayerArray()
• getid3_mp3::MPEGaudioBitrateArray()
• getid3_mp3::MPEGaudioFrequencyArray()
• getid3_mp3::MPEGaudioChannelModeArray()
• getid3_mp3::MPEGaudioModeExtensionArray()
• getid3_mp3::MPEGaudioEmphasisArray()
• getid3_mp3::fseek()
• getid3_mp3::ftell()
• getid3_mp3::fread()
• getid3_mp3::MPEGaudioHeaderDecode()
• getid3_mp3::MPEGaudioHeaderValid()

Used by · 1

• getid3_mp3::Analyze()

Source code

View on Trac ↗View on GitHub ↗

1300	public function getOnlyMPEGaudioInfoBruteForce() {1301		$MPEGaudioHeaderDecodeCache   = array();1302		$MPEGaudioHeaderValidCache    = array();1303		$MPEGaudioHeaderLengthCache   = array();1304		$MPEGaudioVersionLookup       = self::MPEGaudioVersionArray();1305		$MPEGaudioLayerLookup         = self::MPEGaudioLayerArray();1306		$MPEGaudioBitrateLookup       = self::MPEGaudioBitrateArray();1307		$MPEGaudioFrequencyLookup     = self::MPEGaudioFrequencyArray();1308		$MPEGaudioChannelModeLookup   = self::MPEGaudioChannelModeArray();1309		$MPEGaudioModeExtensionLookup = self::MPEGaudioModeExtensionArray();1310		$MPEGaudioEmphasisLookup      = self::MPEGaudioEmphasisArray();1311		$LongMPEGversionLookup        = array();1312		$LongMPEGlayerLookup          = array();1313		$LongMPEGbitrateLookup        = array();1314		$LongMPEGpaddingLookup        = array();1315		$LongMPEGfrequencyLookup      = array();1316		$Distribution                 = array();1317		$Distribution['bitrate']      = array();1318		$Distribution['frequency']    = array();1319		$Distribution['layer']        = array();1320		$Distribution['version']      = array();1321		$Distribution['padding']      = array();1322 1323		$info = &$this->getid3->info;1324		$this->fseek($info['avdataoffset']);1325 1326		$max_frames_scan = 5000;1327		$frames_scanned  = 0;1328 1329		$previousvalidframe = $info['avdataoffset'];1330		while ($this->ftell() < $info['avdataend']) {1331			set_time_limit(30);1332			$head4 = $this->fread(4);1333			if (strlen($head4) < 4) {1334				break;1335			}1336			if ($head4[0] != "\xFF") {1337				for ($i = 1; $i < 4; $i++) {1338					if ($head4[$i] == "\xFF") {1339						$this->fseek($i - 4, SEEK_CUR);1340						continue 2;1341					}1342				}1343				continue;1344			}1345			if (!isset($MPEGaudioHeaderDecodeCache[$head4])) {1346				$MPEGaudioHeaderDecodeCache[$head4] = self::MPEGaudioHeaderDecode($head4);1347			}1348			if (!isset($MPEGaudioHeaderValidCache[$head4])) {1349				$MPEGaudioHeaderValidCache[$head4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$head4], false, false);1350			}1351			if ($MPEGaudioHeaderValidCache[$head4]) {1352 1353				if (!isset($MPEGaudioHeaderLengthCache[$head4])) {1354					$LongMPEGversionLookup[$head4]   = $MPEGaudioVersionLookup[$MPEGaudioHeaderDecodeCache[$head4]['version']];1355					$LongMPEGlayerLookup[$head4]     = $MPEGaudioLayerLookup[$MPEGaudioHeaderDecodeCache[$head4]['layer']];1356					$LongMPEGbitrateLookup[$head4]   = $MPEGaudioBitrateLookup[$LongMPEGversionLookup[$head4]][$LongMPEGlayerLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['bitrate']];1357					$LongMPEGpaddingLookup[$head4]   = (bool) $MPEGaudioHeaderDecodeCache[$head4]['padding'];1358					$LongMPEGfrequencyLookup[$head4] = $MPEGaudioFrequencyLookup[$LongMPEGversionLookup[$head4]][$MPEGaudioHeaderDecodeCache[$head4]['sample_rate']];1359					$MPEGaudioHeaderLengthCache[$head4] = self::MPEGaudioFrameLength(1360						$LongMPEGbitrateLookup[$head4],1361						$LongMPEGversionLookup[$head4],1362						$LongMPEGlayerLookup[$head4],1363						$LongMPEGpaddingLookup[$head4],1364						$LongMPEGfrequencyLookup[$head4]);1365				}1366				if ($MPEGaudioHeaderLengthCache[$head4] > 4) {1367					$WhereWeWere = $this->ftell();1368					$this->fseek($MPEGaudioHeaderLengthCache[$head4] - 4, SEEK_CUR);1369					$next4 = $this->fread(4);1370					if ($next4[0] == "\xFF") {1371						if (!isset($MPEGaudioHeaderDecodeCache[$next4])) {1372							$MPEGaudioHeaderDecodeCache[$next4] = self::MPEGaudioHeaderDecode($next4);1373						}1374						if (!isset($MPEGaudioHeaderValidCache[$next4])) {1375							$MPEGaudioHeaderValidCache[$next4] = self::MPEGaudioHeaderValid($MPEGaudioHeaderDecodeCache[$next4], false, false);1376						}1377						if ($MPEGaudioHeaderValidCache[$next4]) {1378							$this->fseek(-4, SEEK_CUR);1379

Changelog

Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

About this page

Parsed data

Generated from the wordpress-develop 7.1.0 tag, from src/wp-includes/ID3/module.audio.mp3.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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