Manage media field with form api forms for Drupal 7 administration pages

media_field_formapi.php

<?php
/**
 * Manage media field with form api forms for administration pages
 * Depends of media module http://dgo.to/media
 **/

/**
 * Function called by drupal_get_form()
 **/
function myform($form, &$form_state) {
  // Get fid from variable
  $myform_mediafile_media1 = variable_get('myform_mediafile_media1', array());
  // Build one media field
  $form['myform_mediafile_media1'] = array(
    '#title' => t("Fichier 1"),
    '#description' => t("Fichier 1 description"),
    '#type' => 'media',
    '#tree' => TRUE,
    '#value' => $myform_mediafile_media1,
  );

  // Get fid from variable
  $myform_mediafile_media2 = variable_get('myform_mediafile_media2', array());
  // Build another media field
  $form['myform_mediafile_media2'] = array(
    '#title' => t("Fichier 2"),
    '#description' => t("Fichier 2 description"),
    '#type' => 'media',
    '#tree' => TRUE,
    '#value' => $myform_mediafile_media2,
  );

  // Add submit hook function
  $form['#submit'][] = 'myform_submit';

  return system_settings_form($form);
}

function myform_submit($form, &$form_state) {
	// Manually put new fid in input values
  if (isset($form_state['input']['myform_mediafile_media1']['fid'])) {
    $form_state['values']['myform_mediafile_media1']['fid'] = $form_state['input']['myform_mediafile_media1']['fid'];
  }
  if (isset($form_state['input']['myform_mediafile_media2']['fid'])) {
    $form_state['values']['myform_mediafile_media2']['fid'] = $form_state['input']['myform_mediafile_media2']['fid'];
  }
}