<?php
/**
* This is a pure php emulation of the PHP module FFmpeg-PHP.
* @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.
* @see ffmpeg-php,
* - @link http://ffmpeg-php.sourceforge.net/
* - @author Todd Kirby.
* - all phpdoc documentation is lifted directly from the ffmpeg-php docs
*/
class ffmpeg_frame
{
private $_gd_resource = null;
private $_width = null;
private $_height = null;
private $_pts = null;
/**
* Class Constructor
* @param resource $gd_resource A GD image resource.
* @param float $pts The frame presentation timestamp. Default value 0.0
*/
function __construct($gd_resource, $pts=0.0)
{
$this->_gd_resource = $gd_resource;
$this->_pts = $pts;
$this->_width = imagesx($gd_resource);
$this->_height = imagesy($gd_resource);
}
function __destruct()
{
if(is_resource($this->_gd_resource))
{
imagedestroy($this->_gd_resource);
}
}
/**
* Determines if the resource supplied to the frame is valid.
* @access public
* @return integer
*/
public function hasValidResource()
{
return is_resource($this->_gd_resource);
}
/**
* 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->_pts;
}
/**
* Resize and optionally crop the frame. (Cropping is built into ffmpeg resizing so I'm providing it here for completeness.)
* 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, $crop_right=false)
{
// are we cropping?
if($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)
{
// 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 integer
*/
public function toGDImage()
{
return $this->_gd_resource;
}
}
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