static double
udp_timediff (int32_t id, int socket) {
int i;
double lag;
struct timeval time;
double diff = 0.0;
int diffc = 0;
xmmsc_vis_udp_timing_t packet_d;
char* packet = packet_init_timing (&packet_d);
gettimeofday (&time, NULL);
XMMSC_VIS_UNALIGNED_WRITE (packet_d.__unaligned_id, (int32_t)htonl (id), int32_t);
XMMSC_VIS_UNALIGNED_WRITE (&packet_d.__unaligned_clientstamp[0],
(int32_t)htonl (time.tv_sec), int32_t);
XMMSC_VIS_UNALIGNED_WRITE (&packet_d.__unaligned_clientstamp[1],
(int32_t)htonl (time.tv_usec), int32_t);
/* TODO: handle lost packages! */
for (i = 0; i < 10; ++i) {
send (socket, packet, packet_d.size, 0);
}
printf ("Syncing ");
do {
if ((recv (socket, packet, packet_d.size, 0) == packet_d.size) && (*packet_d.__unaligned_type == 'T')) {
struct timeval rtv;
gettimeofday (&time, NULL);
XMMSC_VIS_UNALIGNED_READ (rtv.tv_sec, &packet_d.__unaligned_clientstamp[0], int32_t);
XMMSC_VIS_UNALIGNED_READ (rtv.tv_usec, &packet_d.__unaligned_clientstamp[1], int32_t);
rtv.tv_sec = ntohl (rtv.tv_sec);
rtv.tv_usec = ntohl (rtv.tv_usec);
lag = (tv2ts (&time) - tv2ts (&rtv)) / 2.0;
diffc++;
XMMSC_VIS_UNALIGNED_READ (rtv.tv_sec, &packet_d.__unaligned_serverstamp[0], int32_t);
XMMSC_VIS_UNALIGNED_READ (rtv.tv_usec, &packet_d.__unaligned_serverstamp[1], int32_t);
rtv.tv_sec = ntohl (rtv.tv_sec);
rtv.tv_usec = ntohl (rtv.tv_usec);
diff += tv2ts (&rtv) - lag;
/* debug output
printf("server diff: %f \t old timestamp: %f, new timestamp %f\n",
net2ts (packet_d.serverstamp), net2ts (packet_d.clientstamp), tv2ts (&time));
end of debug */
putchar('.');
}
} while (diffc < 10);
free (packet);
puts (" done.");
return diff / (double)diffc;
}
static gboolean
udpwatcher (GIOChannel *src, GIOCondition cond, xmms_visualization_t *vis)
{
struct sockaddr_storage from;
socklen_t sl = sizeof (from);
xmmsc_vis_udp_timing_t packet_d;
char* packet = packet_init_timing (&packet_d);
if ((recvfrom (vis->socket, packet, packet_d.size, 0, (struct sockaddr *)&from, &sl)) > 0) {
if (*packet_d.__unaligned_type == 'H') {
xmms_vis_client_t *c;
int32_t id;
XMMSC_VIS_UNALIGNED_READ (id, packet_d.__unaligned_id, int32_t);
id = ntohl (id);
/* debug code starts
char adrb[INET6_ADDRSTRLEN];
struct sockaddr_in6 *a = (struct sockaddr_in6 *)&from;
printf ("Client address: %s:%d, %d\n", inet_ntop (AF_INET6, &a->sin6_addr,
adrb, INET6_ADDRSTRLEN), a->sin6_port, id);
debug code ends */
g_mutex_lock (vis->clientlock);
c = get_client (id);
if (!c || c->type != VIS_UDP) {
g_mutex_unlock (vis->clientlock);
return TRUE;
}
/* save client address according to id */
memcpy (&c->transport.udp.addr, &from, sizeof (from));
c->transport.udp.socket[0] = 1;
c->transport.udp.grace = 2000;
g_mutex_unlock (vis->clientlock);
} else if (*packet_d.__unaligned_type == 'T') {
struct timeval time;
xmms_vis_client_t *c;
int32_t id;
XMMSC_VIS_UNALIGNED_READ (id, packet_d.__unaligned_id, int32_t);
id = ntohl (id);
g_mutex_lock (vis->clientlock);
c = get_client (id);
if (!c || c->type != VIS_UDP) {
g_mutex_unlock (vis->clientlock);
free (packet);
return TRUE;
}
c->transport.udp.grace = 2000;
g_mutex_unlock (vis->clientlock);
/* give pong */
gettimeofday (&time, NULL);
struct timeval cts, sts;
XMMSC_VIS_UNALIGNED_READ (cts.tv_sec, &packet_d.__unaligned_clientstamp[0], int32_t);
XMMSC_VIS_UNALIGNED_READ (cts.tv_usec, &packet_d.__unaligned_clientstamp[1], int32_t);
cts.tv_sec = ntohl (cts.tv_sec);
cts.tv_usec = ntohl (cts.tv_usec);
sts.tv_sec = time.tv_sec - cts.tv_sec;
sts.tv_usec = time.tv_usec - cts.tv_usec;
if (sts.tv_usec < 0) {
sts.tv_sec--;
sts.tv_usec += 1000000;
}
XMMSC_VIS_UNALIGNED_WRITE (&packet_d.__unaligned_serverstamp[0],
(int32_t)htonl (sts.tv_sec), int32_t);
XMMSC_VIS_UNALIGNED_WRITE (&packet_d.__unaligned_serverstamp[1],
(int32_t)htonl (sts.tv_usec), int32_t);
sendto (vis->socket, packet, packet_d.size, 0, (struct sockaddr *)&from, sl);
/* new debug:
printf ("Timings: local %f, remote %f, diff %f\n", tv2ts (&time), net2ts (packet_d.clientstamp), net2ts (packet_d.clientstamp) - tv2ts (&time));
ends */
} else {
xmms_log_error ("Received invalid UDP package!");
}
}
free (packet);
return TRUE;
}