<?php
/**
* This file is part of the PHP Video Toolkit v2 package.
*
* @author Oliver Lillie (aka buggedcom) <publicmail@buggedcom.co.uk>
* @license Dual licensed under MIT and GPLv2
* @copyright Copyright (c) 2008-2014 Oliver Lillie <http://www.buggedcom.co.uk>
* @package PHPVideoToolkit V2
* @version 2.1.7-beta
* @uses ffmpeg http://ffmpeg.sourceforge.net/
*/
namespace PHPVideoToolkit;
/**
* This class provides generic data parsing for the output from FFmpeg.
*
* @access public
* @author Oliver Lillie
* @author Jorrit Schippers
* @package default
*/
abstract class ParserAbstract //extends Loggable
{
protected $_program_path;
protected $_temp_directory;
protected $_cacher;
static $_cache = array();
public function __construct(Config $config=null, $program_config_key='ffmpeg')
{
$this->_config = $config === null ? Config::getInstance() : $config;
if($this->_config->cache_driver)
{
$cacher = Cache::getCacher($this->_config);
$this->setCacher($cacher);
}
if($this->isAvailable() === false)
{
throw new Exception('FFmpeg appears to be unavailable on your system.');
}
}
/**
* Sets a cacher object.
*
* @access public
* @author Oliver Lillie
* @param CacheAbstract $cache_object
* @return void
*/
public function setCacher(CacheAbstract $cache_object=null)
{
$this->_cacher = $cache_object;
}
/**
* Returns the cacher object.
*
* @access public
* @author Oliver Lillie
* @return CacheAbstract
*/
public function getCacher()
{
return $this->_cacher;
}
/**
* Gets a value from the class cache and if not found then looks into
* the cache object.
*
* @access public
* @author Oliver Lillie
* @param string $key
* @param string $default_value
* @return void
*/
protected function _cacheGet($key, $default_value=null)
{
if(isset(self::$_cache[$key]) === true)
{
return self::$_cache[$key];
}
else if(is_object($this->_cacher) === true)
{
return $this->_cacher->get($key, $default_value);
}
return $default_value;
}
/**
* Sets a value into the class cache and the cacher object.
*
* @access public
* @author Oliver Lillie
* @param string $key
* @param string $value
* @param string $expiry
* @return void
*/
protected function _cacheSet($key, $value, $expiry=null)
{
self::$_cache[$key] = $value;
if(is_object($this->_cacher) === true)
{
return $this->_cacher->set($key, $value, $expiry);
}
return null;
}
/**
* Checks to see if ffmpeg is available.
*
* @access public
* @author Oliver Lillie
* @param boolean $read_from_cache
* @return boolean
*/
abstract public function isAvailable($read_from_cache=true);
}
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