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<?php
/**
* EmbedVideo
* FFProbe
*
* @author Alexia E. Smith
* @license MIT
* @package EmbedVideo
* @link https://www.mediawiki.org/wiki/Extension:EmbedVideo
*
**/
namespace EmbedVideo;
class FFProbe {
/**
* File Location
*
* @var string
*/
private $file;
/**
* Meta Data Cache
*
* @var array
*/
private $metadata = null;
/**
* Main Constructor
*
* @access public
* @param string File Location on Disk
* @return void
*/
public function __construct($file) {
$this->file = $file;
}
/**
* Return the entire cache of meta data.
*
* @access public
* @return array Meta Data
*/
public function getMetaData() {
if (!is_array($this->metadata)) {
$this->invokeFFProbe();
}
return $this->metadata;
}
/**
* Get a selected stream. Follows ffmpeg's stream selection style.
*
* @access public
* @param string Stream identifier
* Examples:
* "v:0" - Select the first video stream
* "a:1" - Second audio stream
* "i:0" - First stream, whatever it is.
* "s:2" - Third subtitle
* "d:0" - First generic data stream
* "t:1" - Second attachment
* @return mixed StreamInfo object or false if does not exist.
*/
public function getStream($select) {
$this->getMetaData();
$types = [
'v' => 'video',
'a' => 'audio',
'i' => false,
's' => 'subtitle',
'd' => 'data',
't' => 'attachment'
];
if (!isset($this->metadata['streams'])) {
return false;
}
list($type, $index) = explode(":", $select);
$index = intval($index);
$type = (isset($types[$type]) ? $types[$type] : false);
$i = 0;
foreach ($this->metadata['streams'] as $stream) {
if ($type !== false && isset($stream['codec_type'])) {
if ($index === $i && $stream['codec_type'] === $type) {
return new StreamInfo($stream);
}
}
if ($type === false || $stream['codec_type'] === $type) {
$i++;
}
}
return false;
}
/**
* Get the FormatInfo object.
*
* @access public
* @return mixed FormatInfo object or false if does not exist.
*/
public function getFormat() {
$this->getMetaData();
if (!isset($this->metadata['format'])) {
return false;
}
return new FormatInfo($this->metadata['format']);
}
/**
* Invoke ffprobe on the command line.
*
* @access private
* @return boolean Success
*/
private function invokeFFProbe() {
global $wgFFprobeLocation;
if (!file_exists($wgFFprobeLocation)) {
$this->metadata = [];
return false;
}
$json = shell_exec(escapeshellcmd($wgFFprobeLocation.' -v quiet -print_format json -show_format -show_streams ').escapeshellarg($this->file));
$metadata = @json_decode($json, true);
if (is_array($metadata)) {
$this->metadata = $metadata;
} else {
$this->metadata = [];
return false;
}
return true;
}
}
class StreamInfo {
/**
* Stream Info
*
* @var array
*/
private $info = null;
/**
* Main Constructor
*
* @access public
* @param array Stream Info from FFProbe
* @return void
*/
public function __construct($info) {
$this->info = $info;
}
/**
* Simple helper instead of repeating an if statement everything.
*
* @access private
* @param string Field Name
* @return void
*/
private function getField($field) {
return (isset($this->info[$field]) ? $this->info[$field] : false);
}
/**
* Return the codec type.
*
* @access public
* @return string Codec type or false if unavailable.
*/
public function getType() {
return $this->getField('codec_type');
}
/**
* Return the codec name.
*
* @access public
* @return string Codec name or false if unavailable.
*/
public function getCodecName() {
return $this->getField('codec_name');
}
/**
* Return the codec long name.
*
* @access public
* @return string Codec long name or false if unavailable.
*/
public function getCodecLongName() {
return $this->getField('codec_long_name');
}
/**
* Return the width of the stream.
*
* @access public
* @return integer Width or false if unavailable.
*/
public function getWidth() {
return $this->getField('width');
}
/**
* Return the height of the stream.
*
* @access public
* @return integer Height or false if unavailable.
*/
public function getHeight() {
return $this->getField('height');
}
/**
* Return bit depth for a video or thumbnail.
*
* @access public
* @return integer Bit Depth or false if unavailable.
*/
public function getBitDepth() {
return $this->getField('bits_per_raw_sample');
}
/**
* Get the duration in seconds.
*
* @access public
* @return mixed Duration in seconds or false if unavailable.
*/
public function getDuration() {
return $this->getField('duration');
}
/**
* Bit rate in bPS.
*
* @access public
* @return mixed Bite rate in bPS or false if unavailable.
*/
public function getBitRate() {
return $this->getField('bit_rate');
}
}
class FormatInfo {
/**
* Format Info
*
* @var array
*/
private $info = null;
/**
* Main Constructor
*
* @access public
* @param array Format Info from FFProbe
* @return void
*/
public function __construct($info) {
$this->info = $info;
}
/**
* Simple helper instead of repeating an if statement everything.
*
* @access private
* @param string Field Name
* @return void
*/
private function getField($field) {
return (isset($this->info[$field]) ? $this->info[$field] : false);
}
/**
* Get the file path.
*
* @access public
* @return mixed File path or false if unavailable.
*/
public function getFilePath() {
return $this->getField('filename');
}
/**
* Get the duration in seconds.
*
* @access public
* @return mixed Duration in seconds or false if unavailable.
*/
public function getDuration() {
return $this->getField('duration');
}
/**
* Bit rate in bPS.
*
* @access public
* @return mixed Bite rate in bPS or false if unavailable.
*/
public function getBitRate() {
return $this->getField('bit_rate');
}
}
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