zoneminder/web/views/image.php

<?php
//
// ZoneMinder web image view file, $Date: 2008-09-29 14:15:13 +0100 (Mon, 29 Sep 2008) $, $Revision: 2640 $
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
//

// Calling sequence:   ... /zm/index.php?view=image&path=/monid/path/image.jpg&scale=nnn&width=wwww&height=hhhhh
//
//     Path is physical path to the image starting at the monitor id
//
//     Scale is optional and between 1 and 400 (percent),
//          Omitted or 100 = no scaling done, image passed through directly
//          Scaling will increase response time slightly
//
//     width and height are each optional, ideally supply both, but if only one is supplied the other is calculated
//          These are in pixels
//
//     If both scale and either width or height are specified, scale is ignored
//

if ( !canView( 'Events' ) ) {
    $view = 'error';
    return;
}
require_once('includes/Event.php');
require_once('includes/Frame.php');

// Compatibility for PHP 5.4 
if (!function_exists('imagescale')) {
  function imagescale($image, $new_width, $new_height = -1, $mode = 0) {
    $mode; // Not supported

    $new_height = ($new_height == -1) ? imagesy($image) : $new_height;
    $imageNew = imagecreatetruecolor($new_width, $new_height);
    imagecopyresampled($imageNew, $image, 0, 0, 0, 0, (int)$new_width, (int)$new_height, imagesx($image), imagesy($image));

    return $imageNew;
  }
}

$errorText = false;
if ( empty($_REQUEST['path']) ) {
  if ( ! empty($_REQUEST['fid']) ) {
    $show = empty($_REQUEST['show']) ? 'capture' : $_REQUEST['show'];
    if ( ! empty($_REQUEST['eid'] ) ) {
      $Event = new Event( $_REQUEST['eid'] );
      $Frame = Frame::find_one( array( 'EventId' => $_REQUEST['eid'], 'FrameId' => $_REQUEST['fid'] ) );
      if ( ! $Frame ) {
        Fatal("No Frame found for event(".$_REQUEST['eid'].") and frame id(".$_REQUEST['fid'].")");
      }
      $path = $Event->Path().'/'.sprintf("%'.0".ZM_EVENT_IMAGE_DIGITS.'d',$_REQUEST['fid']).'-'.$show.'.jpg';
    } else {
# If we are only specifying fid, then the fid must be the primary key into the frames table. But when the event is specified, then it is the frame #
      $Frame = new Frame( $_REQUEST['fid'] );
      $Event = new Event( $Frame->EventId() );
      $path = $Event->Path().'/'.sprintf("%'.0".ZM_EVENT_IMAGE_DIGITS.'d',$Frame->FrameId()).'-'.$show.'.jpg';
    }
  } else {
    $errorText = "No image path";
  }

  if ( ! file_exists( $path ) ) {
# Generate the frame JPG
    if ( $Event->DefaultVideo() ) {
      $command ='ffmpeg -i '.$Event->Path().'/'.$Event->DefaultVideo().' -vf "select=gte(n\\,'.$Frame->FrameId().'),setpts=PTS-STARTPTS" '.$path;
#$command ='ffmpeg -v 0 -i '.$Storage->Path().'/'.$Event->Path().'/'.$Event->DefaultVideo().' -vf "select=gte(n\\,'.$Frame->FrameId().'),setpts=PTS-STARTPTS" '.$path;
      Debug( "Running $command" );
      $output = array();
      $retval = 0;
      exec( $command, $output, $retval );
      Debug("Retval: $retval, output: " . implode("\n", $output));
      if ( ! file_exists( $path ) ) {
        header("HTTP/1.0 404 Not Found");
        Fatal("Can't create frame images from video for this event (".$Event->DefaultVideo() );
      }
    } else {
      header("HTTP/1.0 404 Not Found");
      Fatal("Can't create frame images from video becuase there is no video file for this event (".$Event->DefaultVideo() );
    }
  }

} else {
  $path = $_REQUEST['path'];
  if ( !empty($user['MonitorIds']) ) {
    $imageOk = false;
    $pathMonId = substr( $path, 0, strspn( $path, "1234567890" ) );
    foreach ( preg_split( '/["\'\s]*,["\'\s]*/', $user['MonitorIds'] ) as $monId ) {
      if ( $pathMonId == $monId ) {
        $imageOk = true;
        break;
      }
    }
    if ( !$imageOk )
      $errorText = "No image permissions";
  }
  if ( ! file_exists( $path ) ) {
    header("HTTP/1.0 404 Not Found");
    Fatal("Image not found at $path");
  }
}

$scale=0;
if( !empty($_REQUEST['scale']) ) {
  if (is_numeric($_REQUEST['scale'])) {
    $x = $_REQUEST['scale'];
    if($x >= 1 and $x <= 400)
      $scale=$x;
  }
}

$width=0;
if ( !empty($_REQUEST['width']) ) {
  if (is_numeric($_REQUEST['width'])) {
    $x = $_REQUEST['width'];
    if($x >= 10 and $x <= 8000)
      $width=$x;
  }
}
$height=0;
if( !empty($_REQUEST['height']) ) {
  if (is_numeric($_REQUEST['height'])) {
    $x = $_REQUEST['height'];
    if($x >= 10 and $x <= 8000)
      $height=$x;
  }
}


header( 'Content-type: image/jpeg' );
ob_clean();
flush();

if ( $errorText ) {
  Error( $errorText );
} else {
  if ( ( $scale==0 || $scale==100 ) && $width==0 && $height==0 ) {
    if ( ! readfile( $path ) ) {
      Error("No bytes read from ". $path );
    }
  } else {
    Debug("Doing a scaled image: scale($scale) width($width) height($height)");
    $i = 0;
    if ( ! ( $width && $height ) ) {
      $i = imagecreatefromjpeg( $path );
      $oldWidth = imagesx( $i );
      $oldHeight = imagesy( $i );
      if ( $width == 0 && $height == 0 ) { // scale has to be set to get here with both zero
        $width = $oldWidth  * $scale / 100.0;
        $height= $oldHeight * $scale / 100.0;
      } elseif ( $width == 0 && $height != 0 ) {
        $width = ($height * $oldWidth) / $oldHeight;
      } elseif ( $width != 0 && $height == 0 ) {
        $height = ($width * $oldHeight) / $oldWidth;
      }
      if ( $width == $oldWidth && $height == $oldHeight) {
        Warning( "No change to width despite scaling." );
      }
    }
  
    # Slight optimisation, thumbnails always specify width and height, so we can cache them.
    $scaled_path = preg_replace('/\.jpg$/', "-${width}x${height}.jpg", $path );
    if ( ! file_exists( $scaled_path ) or ! readfile( $scaled_path ) ) {
      Debug( "Cached scaled image does not exist at $scaled_path or is no good.. Creating it");
      ob_start();
      if ( ! $i )
        $i = imagecreatefromjpeg( $path );
      $iScale = imagescale( $i, $width, $height );
      imagejpeg( $iScale );
      imagedestroy( $i );
      imagedestroy( $iScale );
      $scaled_jpeg_data = ob_get_contents();
      file_put_contents( $scaled_path, $scaled_jpeg_data );
      ob_end_clean();
      echo $scaled_jpeg_data;
    }
  }
}