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<?php
/* SVN FILE: $Id$ */
/**
* @author Oliver Lillie (aka buggedcom) <publicmail@buggedcom.co.uk>
* @package PHPVideoToolkit
* @license BSD
* @copyright Copyright (c) 2008 Oliver Lillie <http://www.buggedcom.co.uk>
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
* is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* This is similar in terms to FFmpeg-PHP's ffmpeg_frame, however the constructor can accept any number of items such as
* a GD image, an image file, or an instance of PHPVideoToolkit, note if using an instance of PHPVideoToolkit you must
* have already specified the frame you wish to extract with PHPVideoToolkit::extractFrame() or set
*/
class PHPVideoToolkit_Frame
{
private $_resource = null;
private $_gd_resource = null;
private $_resource_type = null;
private $_width = null;
private $_height = null;
private $_timecode = null;
/**
* Class Constructor
* @param resource $gd_resource A GD image resource.
* @param integer $timecode The time in seconds of the frame. If false and the $resource is a PHPVideoToolkit instance then the timecode will be retrieved from
* the instance. However if $timecode is set and the $resource is a PHPVideoToolkit the $timecode will override the time retrieved from the instance.
*/
function __construct($resource, $timecode=false)
{
// is this a gd resource
if(is_resource($resource) && get_resource_type($resource) == 'gd')
{
$this->_gd_resource = $resource;
$this->_resource_type = 'gd';
$this->_width = imagesx($resource);
$this->_height = imagesy($resource);
$this->_timecode = $timecode;
}
// is this a gd resource
else if(is_string($resource) && is_file($resource))
{
$this->_resource_type = 'file';
$dimensions = getimagesize($resource);
$this->_width = $dimensions[0];
$this->_height = $dimensions[1];
$this->_timecode = $timecode;
}
// check for PHPVideoToolkit class instance
else if(get_class($resource) == 'PHPVideoToolkit')
{
$info = $resource->getFileInfo();
if(!$info)
{
// throw error
}
if(!isset($info['video']))
{
// throw error
}
$this->_resource = $resource;
$this->_resource_type = 'toolkit';
$this->_width = $info['video']['dimensions']['width'];
$this->_height = $info['video']['dimensions']['height'];
// set the timecode, the $timecode value will override
$set_timecode = $resource->hasCommand('-ss');
$this->_timecode = $timecode === false && $set_timecode !== false ? $set_timecode : $timecode;
}
// isn't a valid resource type so throw error
else
{
// throw error
}
}
/**
* Destroys any gd resource if made
*/
function __destruct()
{
if($this->_resource_type == 'gd' && is_resource($this->_resource))
{
imagedestroy($this->_resource);
}
}
/**
* Determines if the resource supplied to the frame is valid.
* @access public
* @return integer
*/
public function hasValidResource()
{
return $this->_resource_type !== null;
}
/**
* Return the width of the frame.
* @access public
* @return integer
*/
public function getWidth()
{
return $this->_width;
}
/**
* Return the height of the frame.
* @access public
* @return integer
*/
public function getHeight()
{
return $this->_height;
}
/**
* Return the presentation time stamp of the frame.
* @access public
* @uses ffmpeg_frame::getPTS()
* @return integer
*/
public function getPresentationTimestamp()
{
return $this->getPTS();
}
/**
* Return the presentation time stamp of the frame.
* @access public
* @return integer
*/
public function getPTS()
{
return $this->_timecode;
}
/**
* Determines if the current frame is a keyframe.
* @access public
* @return integer
*/
public function isKeyFrame()
{
return false;
}
/**
* Resize and optionally crop the frame.
* NOTE 1: Cropping is always applied to the frame before it is resized.
* NOTE 2: Crop values must be even numbers.
* @access public
* @param integer $width New width of the frame (must be an even number).
* @param integer $height New height of the frame (must be an even number).
* @param integer $crop_top Remove [croptop] rows of pixels from the top of the frame.
* @param integer $crop_bottom Remove [cropbottom] rows of pixels from the bottom of the frame.
* @param integer $crop_left Remove [cropleft] rows of pixels from the left of the frame.
* @param integer $crop_right Remove [cropright] rows of pixels from the right of the frame.
* @return boolean
*/
public function resize($width, $height, $crop_top=false, $crop_bottom=false, $crop_left=false, $crop_right=false)
{
// generate a GD resource
$this->_generateGDImageFromResource();
// are we cropping?
if($crop_top !== false || $crop_bottom !== false || $crop_left !== false || $crop_right !== false)
{
// crop and check it went ok
if(!$this->crop($crop_top, $crop_bottom, $crop_left, $crop_right))
{
return false;
}
}
// check the width and height
if($width <= 0 || $height <= 0)
{
return false;
}
// now resize what we have
$resize_resource = imagecreatetruecolor($width, $height);
// copy the portion we want
imagecopyresampled($resize_resource, $this->_gd_resource, 0, 0, 0, 0, $width, $height, $this->_width, $this->_height);
// destroy the old crop resource to free up memory
imagedestroy($this->_gd_resource);
// save the new resource
$this->_gd_resource = $resize_resource;
// update the saved width and height
$this->_width = $width;
$this->_height = $height;
return true;
}
/**
* Crop the frame.
* @access public
* @param integer $crop_top Remove [croptop] rows of pixels from the top of the frame.
* @param integer $crop_bottom Remove [cropbottom] rows of pixels from the bottom of the frame.
* @param integer $crop_left Remove [cropleft] rows of pixels from the left of the frame.
* @param integer $crop_right Remove [cropright] rows of pixels from the right of the frame.
* @return boolean
*/
public function crop($crop_top=false, $crop_bottom=false, $crop_left=false, $crop_right=false)
{
// generate a GD resource
$this->_generateGDImageFromResource();
// work out the newwidth and height and positions
$w = $this->_width;
$h = $this->_height;
$x = 0;
$y = 0;
$x_bottom_chord = 0;
if($crop_top !== false)
{
$x = $crop_top;
$h -= $crop_top;
}
if($crop_bottom !== false)
{
$h -= $crop_bottom;
}
if($crop_left !== false)
{
$y = $crop_left;
$w -= $crop_left;
}
if($crop_right !== false)
{
$w -= $crop_left;
}
// is the width and height greater than 0
if($w < 0 || $h < 0)
{
return false;
}
// create the new image resource
$crop_resource = imagecreatetruecolor($w, $h);
// copy the portion we want
imagecopyresampled($crop_resource, $this->_gd_resource, 0, 0, $x, $y, $w, $h, $w, $h);
// destroy the old resource to free up memory
imagedestroy($this->_gd_resource);
// save the new resource
$this->_gd_resource = $crop_resource;
// update the saved width and height
$this->_width = $w;
$this->_height = $h;
return true;
}
/**
* Returns a truecolor GD image of the frame.
* @access public
* @return resource Returns a GD resource.
*/
public function toGDImage()
{
$this->_generateGDImageFromResource()
return $this->_gd_resource;
}
/**
* Returns a GD resource from the current resource type.
* @access private
*/
private function _generateGDImageFromResource()
{
// don't do this if the gd resource is already defined
if($this->_gd_resource === null)
{
switch($this->_resource_type)
{
case 'toolkit' :
$result = $this->_resource->execute(false, false);
// check the return value in-case of error
if($result !== PHPVideoToolkit::RESULT_OK)
{
// throw error
}
$img = array_shift($this->_resource->getLastOutput());
if(!is_file($img))
{
// throw error
}
$this->_gd_resource = imagecreatefromjpeg($img);
break;
case 'file' :
$path_info = pathinfo($this->_resource);
switch(strtolower($path_info['extension']))
{
case 'jpeg' :
case 'jpg' :
$this->_gd_resource = imagecreatefromjpeg($this->_resource);
break;
case 'gif' :
$this->_gd_resource = imagecreatefromgif($this->_resource);
break;
case 'png' :
$this->_gd_resource = imagecreatefrompng($this->_resource);
break;
default :
// throw error
}
break;
case 'gd' :
// resource is already gd
break;
}
}
}
}
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