static int process_packet(void *user_data, const uint8_t *pkt, int len)
{
static udptl_state_t *state = NULL;
if (state == NULL)
state = udptl_init(NULL, UDPTL_ERROR_CORRECTION_REDUNDANCY, 3, 3, ifp_handler, NULL);
udptl_rx_packet(state, pkt, len);
return 0;
}
int fax_rxUDPTL(const session_t *session, const uint8_t *buf, int len)
{
int ret_val = 0;
int res = 0;
if(!session || !buf)
{
ret_val = -1; goto _exit;
}
res = udptl_rx_packet(session->fax_params.pvt.udptl_state,
buf, len);
if(res)
{
app_trace(TRACE_ERR, "Fax %04x. UDPTL RX failed (%d)",
session->ses_id, res);
ret_val = -2;
}
_exit:
return ret_val;
}
/*
* Thread for fax receiving
* We need to receive UDP (with UDPTL) packet and feed it to spandsp and also
* get UDPTL from spandsp and send them to remote IAF
*/
void *fax_worker_thread(void *data)
{
fax_session_t *fax_session = (fax_session_t *)data;
struct sockaddr_in local_addr;
int ret_val = 0;
int bytes_received = 0;
const int poll_timeout = 20;
struct pollfd fds;
struct in_addr addr;
addr.s_addr = htonl(fax_session->remote_ip);
printf("fax: Starting T.38 FAX handling: local_port: %d remote_addr:%s:%d\n",
fax_session->local_port, inet_ntoa(addr), fax_session->remote_port);
fax_params_init(fax_session);
ret_val = socket_init(&local_addr, fax_session);
if (ret_val < 0) {
printf("fax: Fax socket init failed\n");
goto thread_finish;
}
fds.fd = ret_val;
fds.events = POLLIN;
fax_params_set_default(fax_session);
if (spanfax_init(fax_session, FAX_TRANSPORT_T38_MOD) != 0) {
printf("fax: spanfax_init() ERROR\n");
goto thread_finish;
}
configure_t38(fax_session);
if(!fax_session->pvt.caller)
{
printf("fax %s receiver: wait first frame\n", fax_session->call_id);
bytes_received = receive_frame(fax_session, msg_buffer, MAX_MSG_SIZE);
printf("fax %s receiver: first frame received\n", fax_session->call_id);
}
fcntl(fax_session->socket_fd, F_SETFL, O_NONBLOCK);
while (!fax_session->pvt.done) {
/*
* All we need to do here is:
* 1) Receive new UDPTL packet without blocking
* 2) Feed it to spandsp (udptl_rx_packet)
* 3) Invoke t38_terminal_send_timeout() function
*/
ret_val = poll(&fds, 1, poll_timeout);
if (ret_val == -1) {
perror("poll");
break;
}
if (fds.revents & POLLIN) {
bytes_received = receive_frame(fax_session, msg_buffer, MAX_MSG_SIZE);
// printf("fax: Packet RECEIVED (size: %d)\n", bytes_received);
if (bytes_received == 0) continue;
if (bytes_received == -1) {
printf("fax: receive_frame() ERRROR: returned -1\n");
break;
}
ret_val = udptl_rx_packet(fax_session->pvt.udptl_state,
msg_buffer, bytes_received);
if (ret_val) printf("fax %s: udptl_rx_packet() ERROR\n", fax_session->call_id);
}
t38_terminal_send_timeout(fax_session->pvt.t38_state, FRAMES_PER_CHUNK);
}
thread_finish:
spanfax_destroy(fax_session);
fax_params_destroy(fax_session);
close(fds.fd);
pthread_exit(NULL);
}
