materio-base-d7/sites/all/modules/contrib/fields/video_embed_field/video_embed_field.api.php

<?php

/**
 *  API Info for video_embed_field module
 */

/**
 *  @function hook_video_embed_handler_info
 *  Can be used to add more handlers for video_embed_field
 *  @return an array of handlers, each handler is an array with the following keys
 *  'title' : required, the untranslated title of the provider, to show to the admin user
 *  'function' : required, the function used to generate the embed code
 *  'thumbnail_function' : optional, the function used to provide the thumbnail for a video
 *  'data_function' : optional, the function to return an array of video data.
 *  'form' : required, the function that returns the settings form for your provider
 *  'domains' : required, an array of domains to match against, this is used to know which provider to use
 *  'defaults' : default values for each setting made configurable in your form function
 *
 *  @see below for function definitions
 */
function hook_video_embed_handler_info() {
  $handlers = array();

  $handlers['ustream'] = array(
    'title' => 'UStream',
    'function' => 'your_module_handle_ustream',
    'thumbnail_function' => 'your_module_handle_ustream_thumbnail',
    'data_function' => 'your_module_handler_ustream_data',
    'form' => 'your_module_handler_ustream_form',
    'domains' => array(
      'ustream.com',
    ),
    'defaults' => array(
      'width' => 640,
      'height' => 360,
    ),
  );

  return $handlers;
}

// Example callbacks for a provider (in this case for ustream) - obviously, these functions are only for example
// purposes

/**
 *  Generate the embed code for a video
 *  @param $url - the video url as entered by the user
 *  @param $settings - the settings for this provider as defined in the form function, 
 *                      defaulting to your provider's defaults
 *  @return the embed code as a renderable array
 */
 function your_module_handle_ustream($url, $settings) {
   return array(
     //this should be the full embed code for your provider, including each of the settings 
     '#markup'  => '<iframe src="ustream"></iframe>', 
   );
 }

 /**
  *  Retrieve information about the thumbnail for a given url
  *  @param $url - the url of the video as entered by the user
  *  @return an array with the keys:
  *    'id' => an id for the video which is unique to your provider, used for naming the cached thumbnail file
  *    'url' => the url to retrieve the thumbnail from 
  */
function your_module_handle_ustream_thumbnail ($url) {
  return array(
    'id' => '12332243242', //generally the id that the provider uses for the video
    'url' => 'http://something/thumbnail/somthing.jpg', //the url of the thumbnail
  );
}

/**
 *  A forms api callback, returns the settings form for the provider
 *  @param $defaults - default/current values for your provider, the currently saved settings
 *                       with empty values filled with the defaults provided in info hook
 *  @return a form as defined by forms api
 *
 *  @see http://api.drupal.org/api/drupal/developer!topics!forms_api_reference.html/7
 */
function your_module_handler_ustream_form($defaults) {
  $form = array();

  $form['width'] = array(
    '#type' => 'textfield',
    '#title' => t('Player Width'),
    '#description' => t('The width of the player in pixels'),
    '#default_value' => $defaults['width'],
  );

  return $form;
}

/**
 *  Return an array of extra data to be stored with the video, this data will be available for theming
 *  @return an array
 */
function your_module_handler_ustream_data($url) {
  return array();
}