getid3_flac::parseMETAdata(): 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_flac::parseMETAdata() 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

66–203

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 340.

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 · 15 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost getid3_flac::parseMETAdata() 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 · 13

• getid3_flac::ftell()
• getid3_flac::fread()
• getid3_lib::BigEndian2Int()
• getid3_flac::metaBlockTypeLookup()
• getid3_flac::warning()
• getid3_flac::error()
• getid3_flac::parseSTREAMINFO()
• getid3_flac::parseAPPLICATION()
• getid3_flac::parseSEEKTABLE()
• getid3_flac::parseVORBIS_COMMENT()
• getid3_flac::parseCUESHEET()
• getid3_flac::parsePICTURE()Parse METADATA_BLOCK_PICTURE flac structure and extract attachment External usage: audio.ogg

Used by · 1

• getid3_flac::Analyze()

Source code

View on Trac ↗View on GitHub ↗

52	public function parseMETAdata() {53		$info = &$this->getid3->info;54		do {55			$BlockOffset   = $this->ftell();56			$BlockHeader   = $this->fread(4);57			$LBFBT         = getid3_lib::BigEndian2Int(substr($BlockHeader, 0, 1));  // LBFBT = LastBlockFlag + BlockType58			$LastBlockFlag = (bool) ($LBFBT & 0x80);59			$BlockType     =        ($LBFBT & 0x7F);60			$BlockLength   = getid3_lib::BigEndian2Int(substr($BlockHeader, 1, 3));61			$BlockTypeText = self::metaBlockTypeLookup($BlockType);62 63			if (($BlockOffset + 4 + $BlockLength) > $info['avdataend']) {64				$this->warning('METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockTypeText.') at offset '.$BlockOffset.' extends beyond end of file');65				break;66			}67			if ($BlockLength < 1) {68				if ($BlockTypeText != 'reserved') {69					// probably supposed to be zero-length70					$this->warning('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockTypeText.') at offset '.$BlockOffset.' is zero bytes');71					continue;72				}73				$this->error('METADATA_BLOCK_HEADER.BLOCK_LENGTH ('.$BlockLength.') at offset '.$BlockOffset.' is invalid');74				break;75			}76 77			$info['flac'][$BlockTypeText]['raw'] = array();78			$BlockTypeText_raw = &$info['flac'][$BlockTypeText]['raw'];79 80			$BlockTypeText_raw['offset']          = $BlockOffset;81			$BlockTypeText_raw['last_meta_block'] = $LastBlockFlag;82			$BlockTypeText_raw['block_type']      = $BlockType;83			$BlockTypeText_raw['block_type_text'] = $BlockTypeText;84			$BlockTypeText_raw['block_length']    = $BlockLength;85			if ($BlockTypeText_raw['block_type'] != 0x06) { // do not read attachment data automatically86				$BlockTypeText_raw['block_data']  = $this->fread($BlockLength);87			}88 89			switch ($BlockTypeText) {90				case 'STREAMINFO':     // 0x0091					if (!$this->parseSTREAMINFO($BlockTypeText_raw['block_data'])) {92						return false;93					}94					break;95 96				case 'PADDING':        // 0x0197					unset($info['flac']['PADDING']); // ignore98					break;99 100				case 'APPLICATION':    // 0x02101					if (!$this->parseAPPLICATION($BlockTypeText_raw['block_data'])) {102						return false;103					}104					break;105 106				case 'SEEKTABLE':      // 0x03107					if (!$this->parseSEEKTABLE($BlockTypeText_raw['block_data'])) {108						return false;109					}110					break;111 112				case 'VORBIS_COMMENT': // 0x04113					if (!$this->parseVORBIS_COMMENT($BlockTypeText_raw['block_data'])) {114						return false;115					}116					break;117 118				case 'CUESHEET':       // 0x05119					if (!$this->parseCUESHEET($BlockTypeText_raw['block_data'])) {120						return false;121					}122					break;123 124				case 'PICTURE':        // 0x06125					if (!$this->parsePICTURE()) {126						return false;127					}128					break;129 130				default:131					$this->warning('Unhandled METADATA_BLOCK_HEADER.BLOCK_TYPE ('.$BlockType.') at offset '.$BlockOffset);

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.flac.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.

Corrections

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