getid3_mp3::LAMEpresetUsedLookup( array $LAMEtag ): string

Compatibility

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

Parameters

$LAMEtagarray

Return value

string

Performance profile

How much work a call to getid3_mp3::LAMEpresetUsedLookup() 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

5–90

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 116.

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 · 1 distinct outcome

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

Used by · 1

• getid3_mp3::decodeMPEGaudioHeader()

Source code

View on Trac ↗View on GitHub ↗

2163	public static function LAMEpresetUsedLookup($LAMEtag) {2164 2165		if ($LAMEtag['preset_used_id'] == 0) {2166			// no preset used (LAME >=3.93)2167			// no preset recorded (LAME <3.93)2168			return '';2169		}2170		$LAMEpresetUsedLookup = array();2171 2172		/////  THIS PART CANNOT BE STATIC .2173		for ($i = 8; $i <= 320; $i++) {2174			switch ($LAMEtag['vbr_method']) {2175				case 'cbr':2176					$LAMEpresetUsedLookup[$i] = '--alt-preset '.$LAMEtag['vbr_method'].' '.$i;2177					break;2178				case 'abr':2179				default: // other VBR modes shouldn't be here(?)2180					$LAMEpresetUsedLookup[$i] = '--alt-preset '.$i;2181					break;2182			}2183		}2184 2185		// named old-style presets (studio, phone, voice, etc) are handled in GuessEncoderOptions()2186 2187		// named alt-presets2188		$LAMEpresetUsedLookup[1000] = '--r3mix';2189		$LAMEpresetUsedLookup[1001] = '--alt-preset standard';2190		$LAMEpresetUsedLookup[1002] = '--alt-preset extreme';2191		$LAMEpresetUsedLookup[1003] = '--alt-preset insane';2192		$LAMEpresetUsedLookup[1004] = '--alt-preset fast standard';2193		$LAMEpresetUsedLookup[1005] = '--alt-preset fast extreme';2194		$LAMEpresetUsedLookup[1006] = '--alt-preset medium';2195		$LAMEpresetUsedLookup[1007] = '--alt-preset fast medium';2196 2197		// LAME 3.94 additions/changes2198		$LAMEpresetUsedLookup[1010] = '--preset portable';                                                           // 3.94a15 Oct 21 20032199		$LAMEpresetUsedLookup[1015] = '--preset radio';                                                              // 3.94a15 Oct 21 20032200 2201		$LAMEpresetUsedLookup[320]  = '--preset insane';                                                             // 3.94a15 Nov 12 20032202		$LAMEpresetUsedLookup[410]  = '-V9';2203		$LAMEpresetUsedLookup[420]  = '-V8';2204		$LAMEpresetUsedLookup[440]  = '-V6';2205		$LAMEpresetUsedLookup[430]  = '--preset radio';                                                              // 3.94a15 Nov 12 20032206		$LAMEpresetUsedLookup[450]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'portable';  // 3.94a15 Nov 12 20032207		$LAMEpresetUsedLookup[460]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'medium';    // 3.94a15 Nov 12 20032208		$LAMEpresetUsedLookup[470]  = '--r3mix';                                                                     // 3.94b1  Dec 18 20032209		$LAMEpresetUsedLookup[480]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'standard';  // 3.94a15 Nov 12 20032210		$LAMEpresetUsedLookup[490]  = '-V1';2211		$LAMEpresetUsedLookup[500]  = '--preset '.(($LAMEtag['raw']['vbr_method'] == 4) ? 'fast ' : '').'extreme';   // 3.94a15 Nov 12 20032212 2213		return (isset($LAMEpresetUsedLookup[$LAMEtag['preset_used_id']]) ? $LAMEpresetUsedLookup[$LAMEtag['preset_used_id']] : 'new/unknown preset: '.$LAMEtag['preset_used_id'].' - report to [email protected]');2214	}

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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