PHP script to grab, proxy, resample and combine from mjpeg streams

Introduction

This script has 2 clearly seperated functions and is easy to figure out. It will proxy and grab a single image from a mjpeg stream and it grabs and resizes 4 pictures and fits them in an empty image of the original size using PHP with GD. Not the most efficient but it works, the grabber and resize portions can be easily seperated.

Installation

Make sure you have a current version of PHP installed and enabled. You will also need GD with the PEAR canvas module

Code

<?php
  // ***************
  // * Jim Anthony *
  // ***************
  function get_image($port)
  {
    $packetsize = 2048;
    $handle = fopen("http://127.0.0.1:$port/", "rb");
    $response = fread($handle, 75);
    $jpglength = substr($response, 65);
    $packets = floor($jpglength / $packetsize);
    for ($i = 0, $jpgfile = ''; $i < $packets; $i++)
      $jpgfile .= fread($handle, $packetsize);
    $jpgfile .= fread($handle, $jpglength % $packetsize);   
    fclose($handle);
    $image = imagecreatefromstring($jpgfile);
    return($image);
  }

  $image = imagecreatetruecolor(640, 480);
  imagecopyresampled($image, get_image(8001), 0, 0, 0, 0, 320, 240, 640, 480);
  imagecopyresampled($image, get_image(8002), 320, 0, 0, 0, 320, 240, 640, 480);
  imagecopyresampled($image, get_image(8003), 0, 240, 0, 0, 320, 240, 640, 480);
  imagecopyresampled($image, get_image(8004), 320, 240, 0, 0, 320, 240, 640, 480);
  header("Content-type: image/jpeg");
  imagejpeg($image);
  destroy($image);
?>

Comments and Bug Reports

Based on John Huongs script

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Fatal error: Call to undefined function imagecreatetruecolor() in /var/www/fusetech/live.php on line 20

-- RomanGaufman - 23 Jul 2008

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