getid3_asf::Analyze(): 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_asf::Analyze() 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

133–171

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 2892.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

0

Nothing in core calls this; the cost is only what you spend yourself.

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_asf::Analyze() 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 · 21

• getid3_asf::fseek()
• getid3_asf::fread()
• getid3_asf::BytestringToGUID()
• getid3_asf::error()
• getid3_lib::LittleEndian2Int()
• getid3_asf::ftell()
• getid3_asf::FILETIMEtoUNIXtime()
• getid3_lib::SafeDiv()Perform a division, guarding against division by zero
• getid3_riff::parseWAVEFORMATex()
• getid3_lib::array_merge_noclobber()
• getid3_asf::warning()
• getid3_asf::HeaderExtensionObjectDataParse()

Source code

View on Trac ↗View on GitHub ↗

59	public function Analyze() {60		$info = &$this->getid3->info;61 62		// Shortcuts63		$thisfile_audio = &$info['audio'];64		$thisfile_video = &$info['video'];65		$info['asf']  = array();66		$thisfile_asf = &$info['asf'];67		$thisfile_asf['comments'] = array();68		$thisfile_asf_comments    = &$thisfile_asf['comments'];69		$thisfile_asf['header_object'] = array();70		$thisfile_asf_headerobject     = &$thisfile_asf['header_object'];71 72 73		// ASF structure:74		// * Header Object [required]75		//   * File Properties Object [required]   (global file attributes)76		//   * Stream Properties Object [required] (defines media stream & characteristics)77		//   * Header Extension Object [required]  (additional functionality)78		//   * Content Description Object          (bibliographic information)79		//   * Script Command Object               (commands for during playback)80		//   * Marker Object                       (named jumped points within the file)81		// * Data Object [required]82		//   * Data Packets83		// * Index Object84 85		// Header Object: (mandatory, one only)86		// Field Name                   Field Type   Size (bits)87		// Object ID                    GUID         128             // GUID for header object - GETID3_ASF_Header_Object88		// Object Size                  QWORD        64              // size of header object, including 30 bytes of Header Object header89		// Number of Header Objects     DWORD        32              // number of objects in header object90		// Reserved1                    BYTE         8               // hardcoded: 0x0191		// Reserved2                    BYTE         8               // hardcoded: 0x0292 93		$info['fileformat'] = 'asf';94 95		$this->fseek($info['avdataoffset']);96		$HeaderObjectData = $this->fread(30);97 98		$thisfile_asf_headerobject['objectid']      = substr($HeaderObjectData, 0, 16);99		$thisfile_asf_headerobject['objectid_guid'] = $this->BytestringToGUID($thisfile_asf_headerobject['objectid']);100		if ($thisfile_asf_headerobject['objectid'] != GETID3_ASF_Header_Object) {101			unset($info['fileformat'], $info['asf']);102			return $this->error('ASF header GUID {'.$this->BytestringToGUID($thisfile_asf_headerobject['objectid']).'} does not match expected "GETID3_ASF_Header_Object" GUID {'.$this->BytestringToGUID(GETID3_ASF_Header_Object).'}');103		}104		$thisfile_asf_headerobject['objectsize']    = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 16, 8));105		$thisfile_asf_headerobject['headerobjects'] = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 24, 4));106		$thisfile_asf_headerobject['reserved1']     = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 28, 1));107		$thisfile_asf_headerobject['reserved2']     = getid3_lib::LittleEndian2Int(substr($HeaderObjectData, 29, 1));108 109		$NextObjectOffset = $this->ftell();110		$ASFHeaderData = $this->fread($thisfile_asf_headerobject['objectsize'] - 30);111		$offset = 0;112		$thisfile_asf_streambitratepropertiesobject = array();113		$thisfile_asf_codeclistobject = array();114		$StreamPropertiesObjectData = array();115 116		for ($HeaderObjectsCounter = 0; $HeaderObjectsCounter < $thisfile_asf_headerobject['headerobjects']; $HeaderObjectsCounter++) {117			$NextObjectGUID = substr($ASFHeaderData, $offset, 16);118			$offset += 16;119			$NextObjectGUIDtext = $this->BytestringToGUID($NextObjectGUID);120			$NextObjectSize = getid3_lib::LittleEndian2Int(substr($ASFHeaderData, $offset, 8));121			$offset += 8;122			switch ($NextObjectGUID) {123 124				case GETID3_ASF_File_Properties_Object:125					// File Properties Object: (mandatory, one only)126					// Field Name                   Field Type   Size (bits)127					// Object ID                    GUID         128             // GUID for file properties object - GETID3_ASF_File_Properties_Object128					// Object Size                  QWORD        64              // size of file properties object, including 104 bytes of File Properties Object header129					// File ID                      GUID         128             // unique ID - identical to File ID in Data Object130					// File Size                    QWORD        64              // entire file in bytes. Invalid if Broadcast Flag == 1131					// Creation Date                QWORD        64              // date & time of file creation. Maybe invalid if Broadcast Flag == 1132					// Data Packets Count           QWORD        64              // number of data packets in Data Object. Invalid if Broadcast Flag == 1133					// Play Duration                QWORD        64              // playtime, in 100-nanosecond units. Invalid if Broadcast Flag == 1134					// Send Duration                QWORD        64              // time needed to send file, in 100-nanosecond units. Players can ignore this value. Invalid if Broadcast Flag == 1135					// Preroll                      QWORD        64              // time to buffer data before starting to play file, in 1-millisecond units. If <> 0, PlayDuration and PresentationTime have been offset by this amount136					// Flags                        DWORD        32              //137					// * Broadcast Flag             bits         1  (0x01)       // file is currently being written, some header values are invalid138					// * Seekable Flag              bits         1  (0x02)       // is file seekable

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

Corrections

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