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/**

 * Alter a list of view modes allowed for a file embedded in the WYSIWYG.

 *

 * @param array $view_modes

 *   An array of view modes that can be used on the file when embedded in the

 *   WYSIWYG.

 * @param object $file

 *   A file entity.

 *

 * @see media_get_wysiwyg_allowed_view_modes()

 */

function hook_media_wysiwyg_allowed_view_modes_alter(&$view_modes, $file) {

  $view_modes['default']['label'] = t('Display an unmodified version of the file');

  unset($view_modes['preview']);

}

/**

 * Alter the WYSIWYG view mode selection form.

 *

 * Similar to a form_alter, but runs first so that modules can add

 * fields specific to a given file type (like alt tags on images) before alters

 * begin to work on the fields.

 *

 * @param array $form

 *   An associative array containing the structure of the form.

 * @param array $form_state

 *   An associative array containing the current state of the form.

 * @param object $file

 *   A file entity.

 *

 * @see media_format_form()

 */

function hook_media_format_form_prepare_alter(&$form, &$form_state, $file) {

  $form['preview']['#access'] = FALSE;

  $file = $form['#media'];

  $form['heading']['#markup'] = t('Embedding %filename of type %filetype', array('%filename' => $file->filename, '%filetype' => $file->type));

}

/**

 * Alter the output generated by Media filter tags.

 *

 * @param array $element

 *   The renderable array of output generated for the filter tag.

 * @param array $tag_info

 *   The filter tag converted into an associative array by

 *   media_token_to_markup() with the following elements:

 *   - 'fid': The ID of the media file being rendered.

 *   - 'file': The object from file_load() of the media file being rendered.

 *   - 'view_mode': The view mode being used to render the file.

 *   - 'attributes': An additional array of attributes that could be output

 *     with media_get_file_without_label().

 * @param array $settings

 *   An additional array of settings.

 *   - 'wysiwyg': A boolean if the output is for the WYSIWYG preview or FALSE

 *     if for normal rendering.

 *

 * @see media_token_to_markup()

 */

function hook_media_token_to_markup_alter(&$element, $tag_info, $settings) {

  if (empty($settings['wysiwyg'])) {

    $element['#attributes']['alt'] = t('This media has been output using the @mode view mode.', array('@mode' => $tag_info['view_mode']));

  }

}