path: root/video.module

<?php

/**
 *
 * @file video.module
 *
 */
defined('VIDEO_RENDERING_PENDING') ||
    define('VIDEO_RENDERING_PENDING', 1);
defined('VIDEO_RENDERING_INQUEUE') ||
    define('VIDEO_RENDERING_INQUEUE', 2);
defined('VIDEO_RENDERING_ACTIVE') ||
    define('VIDEO_RENDERING_ACTIVE', 5);
defined('VIDEO_RENDERING_COMPLETE') ||
    define('VIDEO_RENDERING_COMPLETE', 10);
defined('VIDEO_RENDERING_FAILED') ||
    define('VIDEO_RENDERING_FAILED', 20);

// include the field element
module_load_include('inc', 'video', 'video.field');
module_load_include('inc', 'video', 'video.features');

/*
 * Implementation of hook_init().
 */

function video_init() {
  drupal_add_css(drupal_get_path('module', 'video') . '/css/video.css');
  drupal_add_js(drupal_get_path('module', 'video') . '/js/video.js');
}

/**
 * Implementation of hook_permission().
 */
function video_permission() {
  $perms = array(
    'bypass conversion video' => array(
      'title' => t('Bypass video conversion'),
      'description' => t('Warning: Give to trusted roles only; this permission has security implications.'),
    ),
    'convert on submission' => array(
      'title' => t('Convert video on submit'),
      'description' => t('Warning: Give to trusted roles only; this permission has security implications.'),
    ),
    'override player dimensions' => array(
      'title' => t('Change default player dimentions'),
      'description' => t('Warning: Give to trusted roles only; this permission has usability implications.'),
    ),
    'use default thumb' => array(
      'title' => t('Use default thumbnail'),
    ),
    're convert video' => array(
      'title' => t('Re queue video'),
    ),
    'administer video presets' => array(
      'title' => t('Administer video presets'),
      'description' => t('Perform administration tasks for the video presets.'),
    ),
  );
  return $perms;
}

/**
 * Implementation of hook_theme().
 */
function video_theme() {
  $theme = array();
  $theme['video'] = array(
    'variables' => array('item' => NULL, 'path' => NULL, 'video_style' => NULL, 'entity' => NULL, 'field' => NULL, 'instance' => NULL),
    'file' => 'video.theme.inc',
  );
  $theme['video_thumbnail'] = array(
    'variables' => array('item' => NULL, 'path' => NULL, 'video_style' => NULL, 'entity' => NULL, 'field' => NULL, 'instance' => NULL),
    'file' => 'video.theme.inc',
  );
  $theme['video_widget'] = array(
    'render element' => 'element',
    'file' => 'video.theme.inc',
  );
  $theme['video_conversion_failed'] = array(
    'variables' => array(),
    'file' => 'video.theme.inc',
  );
  $theme['video_inprogress'] = array(
    'variables' => array(),
    'file' => 'video.theme.inc',
  );

  $path = drupal_get_path('module', 'video') . '/theme';
  //Lets setup our themes for our players
  $players = video_video_players();
  foreach ($players as $tpl => $value) {
    $theme[$tpl] = array(
      'variables' => array('video' => NULL, 'themed_output' => NULL),
      'template' => str_replace('_', '-', $tpl),
      'path' => $path,
    );
  }
  //We need to add an flv theme buffer to allow users to override in their own module to add in extra parameters before
  //calling our flv template file.
  $theme['video_flv'] = array(
    'variables' => array('video' => NULL),
    'file' => 'video.theme.inc'
  );
  $theme['video_html5'] = array(
    'variables' => array('video' => NULL),
    'file' => 'video.theme.inc'
  );
  return $theme;
}

/*
 * Implmentation of hook_cron().
 */

function video_cron() {
  if (variable_get('video_cron', TRUE)) {
    module_load_include('inc', 'video', 'includes/conversion');
    $video_conversion = new video_conversion;
    if ($videos = $video_conversion->load_job_queue()) {
      $queue = DrupalQueue::get('video_queue');
      foreach ($videos as $video) {
        if ($queue->createItem($video)) {
          $video_conversion->change_status($video->vid, VIDEO_RENDERING_INQUEUE);
        }
      }
    }
  }
}

/**
 * Implmentation of hook_cron_queue_info()
 */
function video_cron_queue_info() {
  $queues['video_queue'] = array(
    'worker callback' => 'video_queue_process',
    'time' => variable_get('video_queue_timeout', 90),
  );
  return $queues;
}

/**
 * Process video transcoding queue
 */
function video_queue_process($video) {
  module_load_include('inc', 'video', 'includes/conversion');
  $video_conversion = new video_conversion;
  $video_conversion->process($video);
}

/*
 * Utility function that will add a preview of thumbnails for you to select when uploading videos.
 */

function video_thumb_process(&$element, &$form_state) {
  // Developed for ffmpeg support
  $file = $element['#value'];
  $delta = $file['fid'];
  $field = field_widget_field($element, $form_state);
  $instance = field_widget_instance($element, $form_state);
  $settings = $instance['widget']['settings'];
  $gen_fail = FALSE;

  if (isset($element['preview']) && $file['fid'] != 0) {
    if (in_array($field['settings']['autothumbnail'], array('auto', 'auto_fallback'))) {
      $default_thumb = array();
      $transcoder = new video_transcoder;
      if ($thumbs = $transcoder->generate_thumbnails($file)) {
        $default_thumb = array_rand($thumbs);
        if (!empty($thumbs)) {
          foreach ($thumbs as $fid => $img) {
            // if file object contain url then use file name to identify object
            $thumbss[$img->fid] = theme('image_style', array('style_name' => $field['settings']['preview_video_thumb_style'], 'path' => $img->uri));
          }
        }
      }

      if (!empty($thumbss)) {
        $element['thumbnail'] = array(
          '#type' => 'radios',
          '#title' => t('Video thumbnails'),
          '#element_validate' => array('video_thumbnail_validate'),
          '#options' => $thumbss,
          '#default_value' => !empty($file['thumbnail']) ? $file['thumbnail'] : $thumbs[$default_thumb]->fid,
          '#weight' => 10,
          '#attributes' => array('class' => array('video-thumbnails'), 'onchange' => 'videoftp_thumbnail_change()', 'rel' => 'video_large_thumbnail-' . $delta),
        );
      }
      else {
        $gen_fail = TRUE;
      }
    }
    // if fail creating thumbnails fall back to manual or manual upload
    if ((!empty($gen_fail) && $field['settings']['autothumbnail'] == 'auto_fallback') ||
        $field['settings']['autothumbnail'] == 'manual_upload') {
      $element['thumbnail'] = array(
        '#title' => t('Video thumbnail'),
//        '#element_validate' => array('video_thumbnail_validate'),
        '#type' => 'managed_file',
        '#description' => t('The uploaded image will be used as video thumbnail on this video.'),
        '#default_value' => !empty($file['thumbnail']['fid']) && is_integer($file['thumbnail']['fid']) ? $file['thumbnail']['fid'] : NULL,
        '#upload_location' => file_default_scheme() . '://' . variable_get('video_thumb_path', 'videos/thumbnails') . '/' . $file['fid'],
      );
    }
    // if no thumbnail creation
    if ($field['settings']['autothumbnail'] == 'no') {
      $element['thumbnail'] = array(
        '#type' => 'value',
        '#value' => NULL,
      );
    }
    // Setup our large thumbnail that is on the left.
    // @todo Add smaller video preview instead of thumbnail?
    if (isset($file['thumbnail']) && !empty($file['thumbnail'])) {
      $large_thumb = file_load($file['thumbnail']);
    }
    elseif (!empty($field['settings']['default_video_thumbnail']['fid'])) {
      $large_thumb = file_load($field['settings']['default_video_thumbnail']['fid']);
    }
    else {
//      $large_thumb = file_load($default_thumb);
    }
//    print_r($field['settings']);
//    $default_thumbnail = file_load($field['settings']['default_video_thumbnail']);
    // @todo Add video player
    if (!empty($large_thumb))
      $element['preview']['#suffix'] = '<div class="video_large_thumbnail-' . $delta . '">' . theme('image_style', array('style_name' => $field['settings']['preview_video_thumb_style'], 'path' => $large_thumb->uri)) . '</div>';
  }
}

/**
 * Implementation of hook_file_delete().
 */
function video_file_delete($file) {
  db_delete('video_files')
      ->condition('fid', $file->fid)
      ->execute();
}

/**
 * Compares passed extensions with normal video web extensions.
 */
function video_web_extensions($ext) {
  $extensions = array_filter(explode(' ', $ext));
  $web_extensions = array(
    'mov', 'mp4', '3gp', '3g2', 'mpg', 'mpeg', // quicktime
    'divx', 'mkv', //divx
    'rm', // realplayer
    'flv', 'f4v', //flash player
    'swf', // swf player
    'dir', 'dcr', // dcr player
    'asf', 'wmv', 'avi', 'mpg', 'mpeg', // windows media
    'ogg', 'ogv', 'webm' // ogg/ogv theora
  );
  if (count(array_diff($extensions, $web_extensions))) {
    return FALSE;
  }
  return TRUE;
}

/**
 * Implementation of hook_views_api().
 */
function video_views_api() {
  return array(
    'api' => 2.0,
    'path' => drupal_get_path('module', 'video') . '/views',
  );
}

/**
 * Process elements loads on settings
 * @param <type> $element
 */
function video_widget_element_settings(&$element, &$form_state) {
  $file = $element['#value'];
  $delta = $element['#delta'];

  $field = field_widget_field($element, $form_state);
  $instance = field_widget_instance($element, $form_state);
  $settings = $instance['settings'];
  // Check if using the default width and replace tokens.
  $default_dimensions = user_access('override player dimensions');
  $description = t('Set your video dimensions.  This will create your player with these dimensions.');
  //setup our default dimensions.
  $dimensions = $settings['default_dimensions'];
  $player_dimensions = $settings['default_player_dimensions'];
  // Lets figure out our dimensions for our video and add astericks next to our options.
  $options = video_explode("\n", variable_get("video_metadata_dimensions", video_default_dimensions()));
  if ($field['settings']['autoconversion'] && isset($element['preview']) &&
      $file['fid'] != 0 && $default_dimensions) {
    $file_object = file_load($file['fid']);
    $video_info = _video_dimensions_options($options, drupal_realpath($file_object->uri));
    $description = t('Set your video dimensions.  This will create your player
      and transcode your video with these dimensions.  Your video size is !size,
      if you choose a higher resolution, this could cause video distortion.
      You are shown dimensions that match your aspect ratio,
      if you choose dimensions that do not match your ratio, we will pad your
      video by adding black bars on either the top or bottom while maintaining
      your videos original aspect ratio.', array('!size' => $video_info['width'] . 'x' . $video_info['height']));
    //setup our default display of dimensions.
    //lets go through our options looking for a matching resolution
    foreach ($options as $key => $value) {
      if (stristr($value, t('(Matches Resolution)')) == TRUE) {
        $dimensions = $key;
        break;
      }
    }
  }
  // Override our dimensions to the user selected.
  if (isset($file['dimensions']) && !empty($file['dimensions'])) {
    $dimensions = $file['dimensions'];
  }

  // Override our player dimensions to the user selected.
  if (isset($file['player_dimensions']) && !empty($file['player_dimensions'])) {
    $player_dimensions = $file['player_dimensions'];
  }

  // show only enabled the autoconversion
  if ($field['settings']['autoconversion']) {
    $element['dimensions'] = array(
      '#type' => 'select',
      '#title' => t('Dimensions for Video Transcoding'),
      '#default_value' => $dimensions,
      '#description' => $description,
      '#options' => $options,
    );
  }
  // get the player dimentions
  $element['player_dimensions'] = array(
    '#type' => 'select',
    '#title' => t('Dimensions for Video Player'),
    '#default_value' => $player_dimensions,
    '#description' => t('WxH of your video player.'),
    '#options' => $options,
  );
  // If users cannot change the default dimensions, lets change this to a value.
  if (!$default_dimensions) {
    $element['dimensions']['#type'] = 'value';
    $element['dimensions']['#value'] = $dimensions;
    $element['player_dimensions']['#type'] = 'value';
    $element['player_dimensions']['#value'] = $player_dimensions;
  }

  // only in preview mode and then create thumbnails
  if ($field['settings']['autoconversion']) {
    // check if already converted or failed
    module_load_include('inc', 'video', '/includes/conversion');
    $video_conversion = new video_conversion;
    $video = $video_conversion->load_job($file['fid']);
    if (user_access('re convert video') && isset($video->video_status) && ($video->video_status == VIDEO_RENDERING_COMPLETE || $video->video_status == VIDEO_RENDERING_FAILED)) {
      $status = array(VIDEO_RENDERING_COMPLETE => 'completed', VIDEO_RENDERING_FAILED => 'failed');
      $element['re_convert_video'] = array(
        '#type' => 'checkbox',
        '#title' => t('Video conversion has been <b>' . $status[$video->video_status] . '!</b>. Re-queue video?.'),
        '#description' => t('This will re-convert your video to output formats when you save, or scheduling it for cron.'),
        '#attributes' => array('class' => array('video-re-convert', 'video-' . $video->video_status)),
      );
    }
    if (user_access('bypass conversion video')) {
      $element['bypass_autoconversion'] = array(
        '#type' => 'checkbox',
        '#title' => t('Bypass auto conversion'),
        '#default_value' => isset($file['bypass_autoconversion']) ? $file['bypass_autoconversion'] : variable_get('video_bypass_conversion', FALSE),
        '#description' => t('This will bypass your auto conversion of videos.'),
        '#attributes' => array('class' => array('video-bypass-auto-conversion')),
      );
    }
    elseif (variable_get('video_bypass_conversion', FALSE)) {
      $element['bypass_autoconversion'] = array(
        '#type' => 'value',
        '#value' => variable_get('video_bypass_conversion', FALSE),
      );
    }
    // check this to convert the video on save
    $convert = isset($file['convert_video_on_save']) ? $file['convert_video_on_save'] : variable_get('video_convert_on_save', FALSE);
    if (user_access('convert on submission')) {
      $element['convert_video_on_save'] = array(
        '#type' => 'checkbox',
        '#title' => t('Convert video on save'),
        '#default_value' => $convert,
        '#description' => t('This will convert your video to flv format when you save, instead of scheduling it for cron.'),
        '#attributes' => array('class' => array('video-convert-video-on-save')),
      );
    }
    elseif (variable_get('video_convert_on_save', FALSE)) {
      $element['convert_video_on_save'] = array(
        '#type' => 'value',
        '#value' => variable_get('video_convert_on_save', FALSE),
      );
    }
  }

  // use of default thumbnail
  $default_thumb = isset($file['use_default_video_thumb']) ? $file['use_default_video_thumb'] : variable_get('video_use_default_thumb', FALSE);
  if (user_access('use default thumb')) {
    $element['use_default_video_thumb'] = array(
      '#type' => 'checkbox',
      '#title' => t('Use the default thumbnail for this video?'),
      '#default_value' => $default_thumb,
      '#description' => t('This will set a flag for this video to use the default video thumbnail when outputed..'),
      '#attributes' => array('class' => array('video-use-default-video-thumb')),
    );
    if ($default_thumb) {
      $element['use_default_video_thumb']['#attributes']['checked'] = 'checked';
    }
  }
  else {
    $element['use_default_video_thumb'] = array(
      '#type' => 'value',
      '#value' => $default_thumb,
    );
  }
}

/*
 * Function updates our options list to show matching aspect ratios and if we have a matching resolution.
 * 
 * We will update the options array by reference and return the aspect ratio of the file.
 */

function _video_dimensions_options(&$options, $video) {
  $aspect_ratio = _video_aspect_ratio($video);
  //loop through our options and find matching ratio's and also the exact width/height
  foreach ($options as $key => $value) {
    $wxh = explode('x', $value);
    //lets check our width and height first
    if ($aspect_ratio['width'] == $wxh[0] && $aspect_ratio['height'] == $wxh[1]) {
      $options[$key] = $value . ' ' . t('(Matches Resolution)');
    }
    else {
      //now lets check our ratio's
      $ratio = number_format($wxh[0] / $wxh[1], 4);
      if ($ratio == $aspect_ratio['ratio']) {
        $options[$key] = $value . ' ' . t('(Matches Ratio)');
      }
    }
  }
  return $aspect_ratio;
}

/*
 * Returns the width/height and aspect ratio of the video
 * 
 * @todo: move this to the transcoder class instead?
 */

function _video_aspect_ratio($video) {
  //lets get our video dimensions from the file
  $transcoder = new video_transcoder;
  $wxh = $transcoder->get_dimensions($video);
  $width = $wxh['width'];
  $height = $wxh['height'];

  if (!$width || !$height) {
    //no width and height found just return.
    watchdog('video_conversion', 'We could not determine the height and width of the video: ' . $video, array(), WATCHDOG_DEBUG);
//    drupal_set_message(t('The system counld not determine the width and height of your video: !video.  If transcoding, the system could have problems.', array('!video' => $video)));
    return;
  }

  //now lets get aspect ratio and compare our options in the select dropdown then add an asterick if any to each option representing a matching aspect ratio.
  $ratio = number_format($width / $height, 4);
  $aspect_ratio = array(
    'width' => $width,
    'height' => $height,
    'ratio' => $ratio,
  );
  return $aspect_ratio;
}

/*
 * Return our list of video extensions and their associated player.
 */

function video_video_extensions() {
  $extensions = array(
    'divx' => 'video_play_divx',
    'mkv' => 'video_play_divx',
    'mov' => 'video_play_quicktime',
    '3gp' => 'video_play_quicktime',
    '3g2' => 'video_play_quicktime',
    'mp4' => 'video_play_quicktime',
    'rm' => 'video_play_realmedia',
    'f4v' => 'video_play_flv',
    'flv' => 'video_play_flv',
    'swf' => 'video_play_flash',
    'dir' => 'video_play_dcr',
    'dcr' => 'video_play_dcr',
    'asf' => 'video_play_windowsmedia',
    'wmv' => 'video_play_windowsmedia',
    'avi' => 'video_play_windowsmedia',
    'mpg' => 'video_play_windowsmedia',
    'mpeg' => 'video_play_windowsmedia',
    'ogg' => 'video_play_theora',
    'ogv' => 'video_play_theora',
    'webm' => 'video_play_theora'
  );
  return $extensions;
}

/*
 * Return our supported video players.
 */

function video_video_players() {
  $players = array(
    'video_play_html5' => t('HTML5 Player'),
    'video_play_divx' => t('Divx Player'),
    'video_play_quicktime' => t('Quicktime'),
    'video_play_realmedia' => t('Real Media Player'),
    'video_play_flv' => t('FLV Flash Players'),
    'video_play_flash' => t('SWF Flash Player'),
    'video_play_dcr' => t('Director/Shockwave'),
    'video_play_windowsmedia' => t('Windows Media Player'),
    'video_play_theora' => t('Theora Player'),
  );
  return $players;
}

/*
 * Return our possible flash players.
 */

function video_video_flv_players() {
  $options = array();
  if (module_exists('swftools')) {
    $options['swftools'] = t('SWF Tools');
  }
  if (module_exists('flowplayer')) {
    $options['flowplayer'] = t('Flowplayer');
  }
  return $options;
}

/*
 * Return our possible flash players.
 */

function video_video_html5_players() {
  $options = array();
  if (module_exists('videojs')) {
    $options['videojs'] = t('VideoJS');
  }
  if (module_exists('video')) {
    $options['video'] = t('Default HTML5');
  }
  return $options;
}

/**
 * Field instances settings
 * @param <type> $widget
 * @return <type>
 */
function video_default_instance_settings($widget) {
  $form = array();
  // Default video settings.
  $form['default_dimensions'] = array(
    '#type' => 'select',
    '#title' => t('Default Video Resolution Dimensions'),
    '#default_value' => !empty($widget['default_dimensions']) ? $widget['default_dimensions'] : '',
    '#options' => video_explode("\n", variable_get("video_metadata_dimensions", video_default_dimensions())),
    '#description' => t('Default transcoding resolution WIDTHxHEIGHT, in px, that FFMPEG will use to transcode your video files.'),
    '#weight' => 15,
  );
  $form['default_player_dimensions'] = array(
    '#type' => 'select',
    '#title' => t('Default Video Player Dimensions'),
    '#default_value' => !empty($widget['default_player_dimensions']) ? $widget['default_player_dimensions'] : '',
    '#options' => video_explode("\n", variable_get("video_metadata_dimensions", video_default_dimensions())),
    '#description' => t('Default player WIDTHxHEIGHT in px.  This is your actual player dimensions that your video will be playing in.'),
    '#weight' => 16,
  );
  return $form;
}

function video_default_field_settings($settings) {
  $form = array();
  // Default video field settings.
  $form['autoconversion'] = array(
    '#type' => 'checkbox',
    '#title' => t('Enable video conversion.'),
    '#description' => t('Use ffmpeg(Default) or Zencoder to automatically convert videos to web compatible types eg. FLV, Please make sure to configure your transcoder settings.'),
    '#default_value' => isset($settings['autoconversion']) ? $settings['autoconversion'] : '',
    '#weight' => 17,
  );

  $thumb_options = array(
    'auto' => 'Automatically generate thumbnails',
    'auto_fallback' => 'Automatically generate thumbnails, with fallback to manual upload if fail',
    'manual_upload' => 'Manually upload a thumbnail',
    'no' => 'Don\'t create thumbnail',
  );

  $form['autothumbnail'] = array(
    '#type' => 'radios',
    '#title' => t('Thumbnail Generation'),
    '#options' => $thumb_options,
    '#description' => t('To use ffmpeg(Default) to create thumbnails, Please make sure to configure your transcoder settings before using ffmpeg to create thumbnails.'),
    '#default_value' => isset($settings['autothumbnail']) ? $settings['autothumbnail'] : 'no',
    '#weight' => 18,
  );

  $form['default_video_thumbnail'] = array(
    '#title' => t('Default video thumbnail'),
    '#type' => 'managed_file',
    '#element_validate' => array('video_field_default_thumbnail_validate'),
    '#description' => t('If use default thumbnanil is selected, this image will be shown on display.'),
    '#default_value' => !empty($settings['default_video_thumbnail']['fid']) ? $settings['default_video_thumbnail']['fid'] : '',
    '#upload_location' => 'public://videos/thumbnails/default',
    '#weight' => 19,
  );
  $form['preview_video_thumb_style'] = array(
    '#title' => t('Preview thumbnail style'),
    '#type' => 'select',
    '#options' => image_style_options(FALSE),
    '#empty_option' => '<' . t('no preview') . '>',
    '#default_value' => !empty($settings['preview_video_thumb_style']) ? $settings['preview_video_thumb_style'] : '',
    '#description' => t('The preview image will be shown while editing the content.'),
    '#weight' => 20,
  );
  return $form;
}

/*
 * #options helper function to set our key=value for the form api.
 */

function video_explode($delimeter, $dimensions) {
  $options = array();
  $values = explode($delimeter, $dimensions);
  foreach ($values as $value) {
    //lets check we have a value and its in the right format
    if (!empty($value) && video_format_right($value)) {
      $options[trim($value)] = trim($value);
    }
  }
  return $options;
}

function video_format_right($value) {
  $format = explode("x", $value);
  if (!isset($format[0]) || !is_numeric(trim($format[0])))
    return FALSE;
  if (!isset($format[1]) || !is_numeric(trim($format[1])))
    return FALSE;
  return TRUE;
}

/*
 * Default video dimensions.
 */

function video_default_dimensions() {
  return "176x144\n352x288\n704x576\n1408x1152\n128x96\n160x120\n320x240\n640x480\n800x600\n1024x768\n1600x1200\n2048x1024\n1280x1024\n2560x2048\n5120x4096\n852x480\n1366x768\n1600x1024\n1920x1200\n2560x1600\n3200x2048\n3840x2400\n6400x4096\n7680x4800\n320x200\n640x350\n852x480\n1280x720\n1920x1080\n640x360\n320x180";
}

/*
 * Utility function to remove all files and directories recursively.
 */

function rmdirr($dir) {
  if ($objs = glob($dir . "/*")) {
    foreach ($objs as $obj) {
      is_dir($obj) ? rmdirr($obj) : unlink($obj);
    }
  }
  @rmdir($dir);
}

/**
 * Implementation of hook_features_api()
 *
 */
function video_features_api() {
  return array(
    'video' => array(
      'name' => t('Video Presets'),
      'default_hook' => 'video_default_presets',
      'file' => drupal_get_path('module', 'video') . '/video.features.inc',
    ),
  );
}

/**
 * Implements hook_file_download().
 *
 * Control the access to files underneath the styles directory.
 */
function video_file_download($uri) {
  $path = file_uri_target($uri);

  // Private file access for image style derivatives.
  if (strpos($path, 'styles/') === 0) {
    $args = explode('/', $path);
    // Discard the first part of the path (styles).
    array_shift($args);
    // Get the style name from the second part.
    $style_name = array_shift($args);
    // Remove the scheme from the path.
    array_shift($args);

    // Then the remaining parts are the path to the image.
    $original_uri = file_uri_scheme($uri) . '://' . implode('/', $args);

    // Check that the file exists and is an image.
    if ($info = image_get_info($uri)) {
      // Check the permissions of the original to grant access to this image.
      $headers = module_invoke_all('file_download', $original_uri);
      if (!in_array(-1, $headers)) {
        return array(
          // Send headers describing the image's size, and MIME-type...
          'Content-Type' => $info['mime_type'],
          'Content-Length' => $info['file_size'],
          // ...and allow the file to be cached for two weeks (matching the
          // value we/ use for the mod_expires settings in .htaccess) and
          // ensure that caching proxies do not share the image with other
          // users.
          'Expires' => gmdate(DATE_RFC1123, REQUEST_TIME + 1209600),
          'Cache-Control' => 'max-age=1209600, private, must-revalidate',
        );
      }
    }
    return -1;
  }

  // Private file access for the original files. Note that we only
  // check access for non-temporary images, since file.module will
  // grant access for all temporary files.
  $files = file_load_multiple(array(), array('uri' => $uri));
  if (count($files)) {
    $file = reset($files);
    if ($file->status) {
      return file_file_download($uri, 'video');
    }
  }
}

/**
 * Helper funcations
 */
function _video_object_to_array($data) {
  if (is_array($data) || is_object($data)) {
    $result = array();
    foreach ($data as $key => $value) {
      $result[$key] = _video_object_to_array($value);
    }
    return $result;
  }
  return $data;
}