bp_media_update_media_privacy( $album )

function bp_media_update_media_privacy( &$album ) {

	if ( ! empty( $album->id ) ) {

		$privacy      = $album->privacy;
		$media_ids    = BP_Media::get_album_media_ids( $album->id );
		$activity_ids = array();

		if ( ! empty( $media_ids ) ) {
			foreach( $media_ids as $media ) {
				$media_obj          = new BP_Media( $media );
				$media_obj->privacy = $privacy;
				$media_obj->save();

				$attachment_id = $media_obj->attachment_id;
				$main_activity_id = get_post_meta( $attachment_id, 'bp_media_parent_activity_id', true );

				if ( ! empty( $main_activity_id ) ) {
					$activity_ids[] = $main_activity_id;
				}
			}
		}

		if ( ! empty( $activity_ids ) ) {
		    foreach ( $activity_ids as $activity_id ) {
		        $activity = new BP_Activity_Activity( $activity_id );

		        if ( ! empty( $activity ) ) {
			        $activity->privacy = $privacy;
			        $activity->save();
		        }
            }
        }
	}
}