static int tc_x11_configure(TCModuleInstance *self,
                            const char *options, vob_t *vob)
{
    TCX11PrivateData *priv = NULL;
    int ret = 0, skew_lim = SKEW_LIM_DEFAULT;

    TC_MODULE_SELF_CHECK(self, "configure");

    priv = self->userdata;

    if (options != NULL) {
        optstr_get(options, "skew_limit", "%i", &skew_lim);
        if (skew_lim < SKEW_LIM_MIN || skew_lim > SKEW_LIM_MAX) {
            tc_log_warn(MOD_NAME, "skew limit value out of range,"
                                  " reset to defaults [%i]",
                        SKEW_LIM_DEFAULT);
        }
    }

    priv->skew = 0;
    priv->reftime = 0;
    priv->expired = 0;
    priv->frame_delay = (uint64_t)(1000000.0 / vob->fps); /* microseconds */
    priv->skew_limit = priv->frame_delay / frame_delay_divs[skew_lim];

    if (verbose >= TC_DEBUG) {
        tc_log_info(MOD_NAME, "frame delay: %lu ms",
                              (unsigned long)priv->frame_delay);
        tc_log_info(MOD_NAME, "skew limit:  %li ms",
                              (long)priv->skew_limit);
    }


    ret = tc_timer_init_soft(&priv->timer, 0);
    if (ret != 0) {
        tc_log_error(MOD_NAME, "configure: can't initialize timer");
        return TC_ERROR;
    }

    /* nothing to do here, yet */
    ret = tc_x11source_is_display_name(vob->video_in_file);
    if (ret == TC_FALSE) {
        tc_log_error(MOD_NAME, "configure: given source doesn't look like"
                               " a DISPLAY specifier");
        return TC_ERROR;
    }

    ret = tc_x11source_open(&priv->src, vob->video_in_file,
                            TC_X11_MODE_BEST, vob->im_v_codec);
    if (ret != 0) {
        tc_log_error(MOD_NAME, "configure: failed to open X11 connection"
                               " to '%s'", vob->video_in_file);
        return TC_ERROR;
    }

    return TC_OK;
}
void probe_x11(info_t *ipipe)
{
#ifdef HAVE_X11
    TCX11Source xsrc;
    int err = tc_x11source_open(&xsrc, ipipe->name,
                                TC_X11_MODE_PLAIN, TC_CODEC_RGB);
    /* performances and colorspaces doesn't really matters here */
    if (err == 0) {
        tc_x11source_probe(&xsrc, ipipe->probe_info);
        tc_x11source_close(&xsrc);
    }
#else /* HAVE_x11 */
    tc_log_error(__FILE__, "No support for X11 compiled in");
    ipipe->probe_info->codec = TC_CODEC_UNKNOWN;
    ipipe->probe_info->magic = TC_MAGIC_UNKNOWN;
#endif /* HAVE_X11 */
    return;
}