zoneminder/web/views/view_video.php

<?php
//
// ZoneMinder web video view file
// Copyright (C) 2001-2008 Philip Coombes
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//

// Calling sequence:   ... /zm/index.php?view=video&event_id=123
//
//     event_id is the id of the event to view
//
//      Does not support scaling at this time.
//

if ( !canView('Events') ) {
  $view = 'error';
  return;
}

# in index.php we do ob_end_start but there can be no output before view_video and we often don't have enough ram to buffer the content.
ob_end_clean();
require_once('includes/Event.php');

$errorText = false;
$path = '';

$Event = null;

if ( ! empty($_REQUEST['eid']) ) {
  $Event = new ZM\Event($_REQUEST['eid']);
  $path = $Event->Path().'/'.$Event->DefaultVideo();
} else if ( ! empty($_REQUEST['event_id']) ) {
  $Event = new ZM\Event($_REQUEST['event_id']);
  $path = $Event->Path().'/'.$Event->DefaultVideo();
} else {
  $errorText = 'No video path';
}

if ( $errorText ) {
  ZM\Error($errorText);
  header('HTTP/1.0 404 Not Found');
  die();
} 

if ( ! ($fh = @fopen($path, 'rb') ) ) {
  ZM\Error('Can\'t open video at '.$path);
  header('HTTP/1.0 404 Not Found');
  die();
}

$size = filesize($path);
$begin = 0;
$end = $size-1;
$length = $size;

if ( isset($_SERVER['HTTP_RANGE']) ) {
  ZM\Debug('Using Range '.$_SERVER['HTTP_RANGE']);
  if ( preg_match('/bytes=\h*(\d+)-(\d*)[\D.*]?/i', $_SERVER['HTTP_RANGE'], $matches) ) {
    $begin = intval($matches[1]);
    if ( !empty($matches[2]) ) {
      $end = intval($matches[2]);
    }
    $length = $end - $begin + 1;
    ZM\Debug("Using Range $begin $end size: $size, length: $length");
  }
} # end if HTTP_RANGE

header('Content-type: video/mp4');
header('Accept-Ranges: bytes');
header('Content-Length: '.$length);
# This is so that Save Image As give a useful filename
if ( $Event ) {
  header('Content-Disposition: inline; filename="' . $Event->DefaultVideo() . '"');
} else {
  header('Content-Disposition: inline;');
}
if ( $begin > 0 || $end < $size-1 ) {
  header('HTTP/1.0 206 Partial Content');
  header("Content-Range: bytes $begin-$end/$size");
  header("Content-Transfer-Encoding: binary\n");
  header('Connection: close');
} else {
  header('HTTP/1.0 200 OK');
}

// Apparently without these we get a few extra bytes of output at the end...
flush();

$cur = $begin;
fseek($fh, $begin, 0);

while ( $length && ( !feof($fh) ) && ( connection_status() == 0 ) ) {
  $amount = min(1024*16, $length);

  print fread($fh, $amount);
  $length -= $amount;
  # Why introduce a speed limit?
  #usleep(100);
  flush();
}

fclose($fh);
exit();