static int v27ter_v21_rx(void *user_data, const int16_t amp[], int len)
{
fax_state_t *t;
fax_modems_state_t *s;
t = (fax_state_t *) user_data;
s = &t->modems;
v27ter_rx(&s->v27ter_rx, amp, len);
if (t->t30.rx_trained)
{
/* The fast modem has trained, so we no longer need to run the slow
one in parallel. */
span_log(&t->logging, SPAN_LOG_FLOW, "Switching from V.27ter + V.21 to V.27ter (%.2fdBm0)\n", v27ter_rx_signal_power(&s->v27ter_rx));
set_rx_handler(t, (span_rx_handler_t *) &v27ter_rx, &s->v27ter_rx);
}
else
{
fsk_rx(&s->v21_rx, amp, len);
if (t->t30.rx_frame_received)
{
/* We have received something, and the fast modem has not trained. We must
be receiving valid V.21 */
span_log(&s->logging, SPAN_LOG_FLOW, "Switching from V.27ter + V.21 to V.21 (%.2fdBm0)\n", fsk_rx_signal_power(&s->v21_rx));
set_rx_handler(t, (span_rx_handler_t *) &fsk_rx, &s->v21_rx);
}
}
return 0;
}
static void fax_set_rx_type(void *user_data, int type, int bit_rate, int short_train, int use_hdlc)
{
fax_state_t *s;
put_bit_func_t put_bit_func;
void *put_bit_user_data;
fax_modems_state_t *t;
s = (fax_state_t *) user_data;
t = &s->modems;
span_log(&s->logging, SPAN_LOG_FLOW, "Set rx type %d\n", type);
if (t->current_rx_type == type)
return;
/*endif*/
t->current_rx_type = type;
t->rx_bit_rate = bit_rate;
if (use_hdlc)
{
put_bit_func = (put_bit_func_t) hdlc_rx_put_bit;
put_bit_user_data = (void *) &t->hdlc_rx;
hdlc_rx_init(&t->hdlc_rx, false, true, HDLC_FRAMING_OK_THRESHOLD, t30_hdlc_accept, &s->t30);
}
else
{
put_bit_func = t30_non_ecm_put_bit;
put_bit_user_data = (void *) &s->t30;
}
/*endif*/
switch (type)
{
case T30_MODEM_V21:
fsk_rx_init(&t->v21_rx, &preset_fsk_specs[FSK_V21CH2], FSK_FRAME_MODE_SYNC, (put_bit_func_t) hdlc_rx_put_bit, put_bit_user_data);
fsk_rx_signal_cutoff(&t->v21_rx, -45.5f);
set_rx_handler(s, (span_rx_handler_t *) &fsk_rx, (span_rx_fillin_handler_t *) &fsk_rx_fillin, &t->v21_rx);
break;
case T30_MODEM_V17:
v17_rx_restart(&t->fast_modems.v17_rx, bit_rate, short_train);
v17_rx_set_put_bit(&t->fast_modems.v17_rx, put_bit_func, put_bit_user_data);
set_rx_handler(s, &v17_v21_rx, &v17_v21_rx_fillin, s);
break;
case T30_MODEM_V27TER:
v27ter_rx_restart(&t->fast_modems.v27ter_rx, bit_rate, false);
v27ter_rx_set_put_bit(&t->fast_modems.v27ter_rx, put_bit_func, put_bit_user_data);
set_rx_handler(s, &v27ter_v21_rx, &v27ter_v21_rx_fillin, s);
break;
case T30_MODEM_V29:
v29_rx_restart(&t->fast_modems.v29_rx, bit_rate, false);
v29_rx_set_put_bit(&t->fast_modems.v29_rx, put_bit_func, put_bit_user_data);
set_rx_handler(s, &v29_v21_rx, &v29_v21_rx_fillin, s);
break;
case T30_MODEM_DONE:
span_log(&s->logging, SPAN_LOG_FLOW, "FAX exchange complete\n");
default:
set_rx_handler(s, (span_rx_handler_t *) &span_dummy_rx, (span_rx_fillin_handler_t *) &span_dummy_rx_fillin, s);
break;
}
/*endswitch*/
}
void obsvr_begin(){
set_rx_handler(&obsvr_req);
}
