getid3_matroska::HandleEMBLClusterBlock( array $element, int $block_type, array $info ): array

Compatibility

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

Parameters

$elementarray

$block_typeint

$infoarray

Return value

array

Performance profile

How much work a call to getid3_matroska::HandleEMBLClusterBlock() 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 what you pass in.

Instructions

67–127

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 153.

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 · 3 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost getid3_matroska::HandleEMBLClusterBlock() can have, taken from its control-flow graph on PHP 8.5.

Uses · 4

• getid3_matroska::readEBMLint()
• getid3_lib::BigEndian2Int()
• getid3_matroska::readEBMLelementData()
• getid3_matroska::BlockLacingType()

Used by · 1

• getid3_matroska::parseEBML()

Source code

View on Trac ↗View on GitHub ↗

1515	private function HandleEMBLClusterBlock($element, $block_type, &$info) {1516		// http://www.matroska.org/technical/specs/index.html#block_structure1517		// http://www.matroska.org/technical/specs/index.html#simpleblock_structure1518 1519		$block_data = array();1520		$block_data['tracknumber'] = $this->readEBMLint();1521		$block_data['timecode']    = getid3_lib::BigEndian2Int($this->readEBMLelementData(2), false, true);1522		$block_data['flags_raw']   = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));1523 1524		if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {1525			$block_data['flags']['keyframe']  = (($block_data['flags_raw'] & 0x80) >> 7);1526			//$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0x70) >> 4);1527		}1528		else {1529			//$block_data['flags']['reserved1'] = (($block_data['flags_raw'] & 0xF0) >> 4);1530		}1531		$block_data['flags']['invisible'] = (bool)(($block_data['flags_raw'] & 0x08) >> 3);1532		$block_data['flags']['lacing']    =       (($block_data['flags_raw'] & 0x06) >> 1);  // 00=no lacing; 01=Xiph lacing; 11=EBML lacing; 10=fixed-size lacing1533		if ($block_type == EBML_ID_CLUSTERSIMPLEBLOCK) {1534			$block_data['flags']['discardable'] = (($block_data['flags_raw'] & 0x01));1535		}1536		else {1537			//$block_data['flags']['reserved2'] = (($block_data['flags_raw'] & 0x01) >> 0);1538		}1539		$block_data['flags']['lacing_type'] = self::BlockLacingType($block_data['flags']['lacing']);1540 1541		// Lace (when lacing bit is set)1542		if ($block_data['flags']['lacing'] > 0) {1543			$block_data['lace_frames'] = getid3_lib::BigEndian2Int($this->readEBMLelementData(1)) + 1; // Number of frames in the lace-1 (uint8)1544			if ($block_data['flags']['lacing'] != 0x02) {1545				for ($i = 1; $i < $block_data['lace_frames']; $i ++) { // Lace-coded size of each frame of the lace, except for the last one (multiple uint8). *This is not used with Fixed-size lacing as it is calculated automatically from (total size of lace) / (number of frames in lace).1546					if ($block_data['flags']['lacing'] == 0x03) { // EBML lacing1547						$block_data['lace_frames_size'][$i] = $this->readEBMLint(); // TODO: read size correctly, calc size for the last frame. For now offsets are deteminded OK with readEBMLint() and that's the most important thing.1548					}1549					else { // Xiph lacing1550						$block_data['lace_frames_size'][$i] = 0;1551						do {1552							$size = getid3_lib::BigEndian2Int($this->readEBMLelementData(1));1553							$block_data['lace_frames_size'][$i] += $size;1554						}1555						while ($size == 255);1556					}1557				}1558				if ($block_data['flags']['lacing'] == 0x01) { // calc size of the last frame only for Xiph lacing, till EBML sizes are now anyway determined incorrectly1559					$block_data['lace_frames_size'][] = $element['end'] - $this->current_offset - array_sum($block_data['lace_frames_size']);1560				}1561			}1562		}1563 1564		if (!isset($info['matroska']['track_data_offsets'][$block_data['tracknumber']])) {1565			$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['offset'] = $this->current_offset;1566			$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'] = $element['end'] - $this->current_offset;1567			//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] = 0;1568		}1569		//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['total_length'] += $info['matroska']['track_data_offsets'][$block_data['tracknumber']]['length'];1570		//$info['matroska']['track_data_offsets'][$block_data['tracknumber']]['duration']      = $block_data['timecode'] * ((isset($info['matroska']['info'][0]['TimecodeScale']) ? $info['matroska']['info'][0]['TimecodeScale'] : 1000000) / 1000000000);1571 1572		// set offset manually1573		$this->current_offset = $element['end'];1574 1575		return $block_data;1576	}

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

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