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<?php
// $Id$

/**
 * @file
 * Implement video rendering scheduling.
 *
 * @author Fabio Varesano <fvaresano at yahoo dot it>
 */
 
 
/**
 * video_scheduler.php configuration
*/

// set to the ffmpeg executable
define('VIDEO_RENDERING_FFMPEG_PATH', '/usr/bin/ffmpeg');

// set to the temp file path.
//IMPORTANT: the user who runs this script must have permissions to create files there. If this is not the case the default php temporary folder will be used.
define('VIDEO_RENDERING_TEMP_PATH', '/tmp/video'); 

// number of conversion jobs active at the same time
define('VIDEO_RENDERING_FFMPEG_INSTANCES', 5);

/**
 * video_scheduler.php configuration ends.
 * DO NOT EDIT BELOW THIS LINE
*/

/**
 * Define some constants
*/
define('VIDEO_RENDERING_PENGING', 0);
define('VIDEO_RENDERING_ACTIVE', 5);
define('VIDEO_RENDERING_COMPLETE', 10);


include_once './includes/bootstrap.inc';
// disable error reporting for bootstrap process
error_reporting(E_ERROR);
// let's bootstrap: we will be able to use drupal apis
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
// enable full error reporting again
error_reporting(E_ALL);


// allow execution only from the command line!
if(empty($_SERVER['REQUEST_METHOD'])) {
  video_scheduler_main();
}
else {
  print t('This script is only executable from the command line.');
  die();
}



/**
 * Main for video_scheduler.php
*/
function video_scheduler_main() {
  
  if($jobs = video_scheduler_select()) {
    foreach ($jobs as $job) {
      video_scheduler_start($job);
    }
  }
  else {
    watchdog('video_scheduler', t('no video conversion jobs to schedule.'));
  }
}


/**
 * Starts rendering for a job
*/
function video_scheduler_start($job) {
  exec("php video_render.php $job->nid $job->vid > /dev/null &");
}


/**
 * Select VIDEO_RENDERING_FFMPEG_INSTANCES jobs from the queue
 *
 * @return an array containing jobs
*/
function video_scheduler_select() {

  $result = db_query('SELECT * FROM {video_rendering} vr INNER JOIN {node} n ON vr.vid = n.vid INNER JOIN {video} v ON n.vid = v.vid WHERE n.nid = v.nid AND vr.nid = n.nid AND vr.status = %d ORDER BY n.created', VIDEO_RENDERING_PENDING);
  
  // TODO: order jobs by priority
  
  $jobs = array();
  $i = 0;
  $count = db_num_rows($result);
  while($i < $count && $i < VIDEO_RENDERING_FFMPEG_INSTANCES) {
    $jobs[] = db_fetch_object($result);
    $i++;
  }
  
  return $jobs;
}




?>