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File: src/PHPVideoToolkit/AnimatedGif.php

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  Classes of Oliver Lillie  >  PHP Video Toolkit  >  src/PHPVideoToolkit/AnimatedGif.php  >  Download  
File: src/PHPVideoToolkit/AnimatedGif.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Video Toolkit
Manipulate and convert videos with ffmpeg program
Author: By
Last change: updated copy right years and a incorrect version number
updated version number in class files
Date: 10 months ago
Size: 6,633 bytes
 

Contents

Class file image Download
<?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 2.1.1
     * @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
     */
   
class AnimatedGif
   
{
        const
UNLIMITED_LOOPS = -1;
       
        protected
$_transcoder;
        protected
$_file_path;
        protected
$_config;
       
        public function
__construct($gif_path=null, Config $config=null)
        {
           
$this->_config = $config === null ? Config::getInstance() : $config;
           
// if we have a file, check that it exists, is readable, is an image and is a gif.
           
if($gif_path !== null)
            {
               
$real_file_path = realpath($gif_path);
                if(
$real_file_path === false || is_file($real_file_path) === false)
                {
                    throw new
Exception('The file does not exist.');
                }
                else if(
is_readable($real_file_path) === false)
                {
                    throw new
Exception('The file is not readable.');
                }
                else if((
$image_info = getimagesize($real_file_path)) === false)
                {
                    throw new
Exception('The file is not an image.');
                }
                else if(
$image_info[2] !== IMAGETYPE_GIF)
                {
                    throw new
Exception('The file is not a gif.');
                }
               
$gif_path = $real_file_path;
            }
           
$this->_file_path = $gif_path;
           
// validate the transcoder engine if set
           
if(in_array($this->_config->gif_transcoder, array('gifsicle', 'convert', 'php', null)) === false)
            {
                throw new
Exception('Unrecognised transcoder engine.');
            }
           
// auto detect a transcoder based on order of preference.
           
$transcoder_engine = null;
            if(
$this->_config->gif_transcoder === null)
            {
               
$transcoder_preference = array('gifsicle', 'convert', 'php');
                foreach (
$transcoder_preference as $transcoder)
                {
                   
$transcoder_class = '\\PHPVideoToolkit\\AnimatedGifTranscoder'.ucfirst($transcoder);
                    if(
call_user_func(array($transcoder_class, 'available'), $this->_config) === true)
                    {
                       
$transcoder_engine = $transcoder_class;
                        break;
                    }
                }
            }
            else
            {
// create the transcoder and check it's available
               
$transcoder_class = '\\PHPVideoToolkit\\AnimatedGifTranscoder'.ucfirst($this->_config->gif_transcoder);
                if(
call_user_func(array($transcoder_class, 'available'), $this->_config) === false)
                {
                    throw new
Exception('The transcoder engine "'.$this->_config->gif_transcoder.'" is not available on your system.');
                }
               
$transcoder_engine = $transcoder_class;
            }
            if(
$transcoder_engine === null)
            {
                throw new
Exception('There are no available transcoders on your system.');
            }
           
           
$this->_transcoder = new $transcoder_engine($this->_config);
        }
       
        public function
getFilePath()
        {
            return
$this->_file_path;
        }
       
       
/**
         * Calls any method in the contained $_parser class.
         *
         * @access public
         * @author Oliver Lillie
         * @param string $name
         * @param string $arguments
         * @return mixed
         */
       
public function __call($name, $arguments)
        {
            if(
method_exists($this->_transcoder, $name) === true)
            {
                return
call_user_func_array(array($this->_transcoder, $name), $arguments);
            }
            else
            {
                throw new
Exception('`'.$name.'` is not a valid animated gif transcoder function.');
            }
        }

       
/**
         * Creates a new animated gif object from a selection of files.
         *
         * @access public
         * @author Oliver Lillie
         * @param string $file_paths
         * @param string $frame_delay
         * @param string $loop_count
         * @return mixed Returns an AnimatedGif object on success, otherwise returns false.
         */
       
public static function createFrom(array $image_object_array, $frame_delay, $loop_count=self::UNLIMITED_LOOPS, Config $config=null)
        {
            if(empty(
$image_object_array) === true)
            {
                throw new
Exception('At least one file path must be specified when creating an animated gif from AnimatedGif::createFrom.');
            }
            if(
$frame_delay <= 0)
            {
                throw new
Exception('The frame delay must be greater than 0.');
            }

// create a new gif and add all the frames.
           
$gif = new self(null, $config);
            foreach (
$image_object_array as $key=>$image)
            {
                if(
is_object($image) === false || get_class($image) !== 'PHPVideoToolkit\\Image')
                {
                    throw new
Exception('The image at key '.$key.' is not an \\PHPVideoToolkit\\Image object. Each frame must be an Image object.');
                }
               
               
$gif->addFrame($image, $frame_delay);
            }
           
// set the loop count
           
$gif->setLoopCount($loop_count);
           
            return
$gif;
        }
       
       
/**
         * Expands an animated gif into a list of files.
         *
         * @access public
         * @author Oliver Lillie
         * @param string $file_path
         * @param string $to_path
         * @return mixed Returns an array of file paths on success, otherwise false.
         */
       
public static function expand($file_path, $to_path, Config $config=null)
        {
           
        }
    }