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/*
* sydra
*
* sydra is a toolbox which allows you to set up multiple bidirectional
* Video/Audio streams from external locations.
* sydra has been written to be used for the Elevate Festival in Graz
* Austria in order to involve external locations to present themselves
* at the festival.
* Sydra is based on GStreamer and is written in C.
*
*
* Copyright (C) 2014 Christian Pointner <equinox@spreadspace.org>
*
* This file is part of sydra.
*
* sydra is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* sydra is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with sydra. If not, see <http://www.gnu.org/licenses/>.
*
* In addition, as a special exception, the copyright holders hereby
* grant permission for non-GPL-compatible GStreamer plugins to be used
* and distributed together with GStreamer and sydra.
* This permission goes above and beyond the permissions granted by the
* GPL license sydra is covered by.
*/
#include "datatypes.h"
#include <string.h>
#include <glib.h>
#include <glib-unix.h>
#include <gio/gio.h>
#include <gst/gst.h>
#include "utils.h"
#include "log.h"
#define UDP_PROTO_MAGIC "SYDRA:"
#define UDP_PROTO_MAGIC_LEN (sizeof(UDP_PROTO_MAGIC)-1)
#define UDP_PROTO_CMD_ADD_CLIENT "add_client\n"
#define UDP_PROTO_CMD_ADD_CLIENT_LEN (sizeof(UDP_PROTO_CMD_ADD_CLIENT)-1)
#define UDP_PROTO_CMD_RM_CLIENT "remove_client\n"
#define UDP_PROTO_CMD_RM_CLIENT_LEN (sizeof(UDP_PROTO_CMD_RM_CLIENT)-1)
static struct udp_client* udp_client_new(struct sockaddr_storage *addr, socklen_t addrlen)
{
struct udp_client* client = g_new(struct udp_client, 1);
if(!client) return NULL;
switch(addr->ss_family)
{
case AF_INET: client->host_.type_ = IPv4; client->host_.port_ = ntohs(((struct sockaddr_in*)addr)->sin_port); break;
case AF_INET6: client->host_.type_ = IPv6; client->host_.port_ = ntohs(((struct sockaddr_in6*)addr)->sin6_port); break;
default: g_free(client); return NULL;
}
int errcode = getnameinfo((struct sockaddr *)addr, addrlen, client->host_.addr_, sizeof(client->host_.addr_),
NULL, 0, NI_NUMERICHOST | NI_NUMERICSERV);
if (errcode != 0) {
log_printf(WARNING, "getnameinfo() error: %s", gai_strerror(errcode));
g_free(client);
return NULL;
}
return client;
}
static void udpsink_add_client(struct sockaddr_storage *addr, socklen_t addrlen, struct udp_sink* sink)
{
struct udp_client* client = udp_client_new(addr, addrlen);
if(!client) return;
GTimeVal now;
g_get_current_time(&now);
client->last_seen_ = GST_TIMEVAL_TO_TIME(now);
GList* entry = g_list_find_custom(sink->clients_, client, cmp_udp_client);
gchar* name = gst_element_get_name(sink->udp_);
if(!entry) {
log_printf(INFO, "adding host %s%c%d to list of receivers for element %s",
client->host_.addr_, client->host_.type_ == IPv4 ? ':' : '.', client->host_.port_, name);
g_signal_emit_by_name(G_OBJECT(sink->udp_), "add", client->host_.addr_, client->host_.port_, NULL);
sink->clients_ = g_list_append(sink->clients_, client);
} else {
log_printf(DEBUG, "not adding host %s%c%d to list of receivers for element %s since it already exists",
client->host_.addr_, client->host_.type_ == IPv4 ? ':' : '.', client->host_.port_, name);
((struct udp_client*)(entry->data))->last_seen_ = client->last_seen_;
g_free(client);
}
g_free(name);
}
static void udpsink_remove_client(struct sockaddr_storage *addr, socklen_t addrlen, struct udp_sink* sink)
{
struct udp_client* client = udp_client_new(addr, addrlen);
if(!client) return;
GList* removee = g_list_find_custom(sink->clients_, client, cmp_udp_client);
gchar* name = gst_element_get_name(sink->udp_);
if(!removee) {
log_printf(WARNING, "client %s%c%d not found in client list for %s - nothing removed",
client->host_.addr_, client->host_.type_ == IPv4 ? ':' : '.', client->host_.port_, name, name);
} else {
g_signal_emit_by_name(G_OBJECT(sink->udp_), "remove", client->host_.addr_, client->host_.port_, NULL);
log_printf(INFO, "client %s%c%d removed from list of receivers for element %s (request)",
client->host_.addr_, client->host_.type_ == IPv4 ? ':' : '.', client->host_.port_, name, name);
gpointer rdata = removee->data;
sink->clients_ = g_list_remove(sink->clients_, removee->data);
g_free(rdata);
}
g_free(name);
g_free(client);
}
static gboolean on_udp_desc_ready(gint fd, GIOCondition cond, gpointer user_data)
{
struct udp_sink* sink = (struct udp_sink*)user_data;
if(!sink || !(sink->udp_)) {
log_printf(WARNING, "File descriptor %d is ready for reading - but supplied element is NULL removing callback", fd);
return FALSE;
}
struct sockaddr_storage addr;
socklen_t addrlen = sizeof(addr);
u_int8_t buf[2048];
ssize_t bytes = recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *)&addr, &addrlen);
if(bytes < 1) {
if(errno == EINTR)
return TRUE;
log_printf(WARNING, "Error while receiving UDP data on fd %d, will remove callback", fd);
return FALSE;
}
if(bytes < UDP_PROTO_MAGIC_LEN || memcmp(UDP_PROTO_MAGIC, buf, UDP_PROTO_MAGIC_LEN)) {
log_printf(DEBUG, "client discovery: ignoring invalid incoming packet");
return TRUE;
}
u_int8_t* cmd = &(buf[UDP_PROTO_MAGIC_LEN]);
if(bytes == (UDP_PROTO_MAGIC_LEN+UDP_PROTO_CMD_ADD_CLIENT_LEN) &&
!memcmp(UDP_PROTO_CMD_ADD_CLIENT, cmd, UDP_PROTO_CMD_ADD_CLIENT_LEN)) {
udpsink_add_client(&addr, addrlen, sink);
} else if(bytes == (UDP_PROTO_MAGIC_LEN+UDP_PROTO_CMD_RM_CLIENT_LEN) &&
!memcmp(UDP_PROTO_CMD_RM_CLIENT, cmd, UDP_PROTO_CMD_RM_CLIENT_LEN)) {
udpsink_remove_client(&addr, addrlen, sink);
} else {
log_printf(DEBUG, "client discovery: ignoring invalid command");
}
return TRUE;
}
static void check_client_timeout(struct udp_sink* sink, int timeout)
{
GTimeVal now;
g_get_current_time(&now);
GstClockTime timeout_time = GST_TIMEVAL_TO_TIME(now) - (timeout * GST_SECOND);
GList *c = sink->clients_;
while(c != NULL) {
GList *next = c->next;
struct udp_client* client = (struct udp_client*)c->data;
if(client->last_seen_ < timeout_time) {
g_signal_emit_by_name(G_OBJECT(sink->udp_), "remove", client->host_.addr_, client->host_.port_, NULL);
gchar* name = gst_element_get_name(sink->udp_);
log_printf(INFO, "client %s%c%d removed from list of receivers for element %s (timeout)",
client->host_.addr_, client->host_.type_ == IPv4 ? ':' : '.', client->host_.port_, name, name);
g_free(name);
g_free(c->data);
sink->clients_ = g_list_delete_link(sink->clients_, c);
}
c = next;
}
}
static gboolean check_all_client_timeouts(gpointer user_data)
{
struct udp_sinks* sinks = (struct udp_sinks*)user_data;
check_client_timeout(&(sinks->rtp_video_), sinks->client_timeout_);
check_client_timeout(&(sinks->rtcp_video_), sinks->client_timeout_);
check_client_timeout(&(sinks->rtp_audio_), sinks->client_timeout_);
check_client_timeout(&(sinks->rtcp_audio_), sinks->client_timeout_);
return TRUE;
}
static gboolean attach_udpsink(struct udp_sink* sink, const char* name, const char* prop)
{
GSocket *sock;
g_object_get(G_OBJECT(sink->udp_), prop, &sock, NULL);
int fd = g_socket_get_fd(sock);
guint id = g_unix_fd_add(fd, G_IO_IN, on_udp_desc_ready, sink);
if(id <= 0) {
log_printf(ERROR, "Error while adding %s file descriptor (%d) to main loop", name, fd);
return FALSE;
}
log_printf(DEBUG, "successfully installed callback for %s (fd: %d) for reading (id: %d)", name, fd, id);
return TRUE;
}
gboolean attach_udpsinks(struct udp_sinks *sinks)
{
if(!sinks)
return FALSE;
if(!attach_udpsink(&(sinks->rtp_video_), "RTP(video) IPv4", "used-socket") ||
!attach_udpsink(&(sinks->rtp_video_), "RTP(video) IPv6", "used-socket-v6") ||
!attach_udpsink(&(sinks->rtcp_video_), "RTCP(video) IPv4", "used-socket") ||
!attach_udpsink(&(sinks->rtcp_video_), "RTCP(video) IPv6", "used-socket-v6") ||
!attach_udpsink(&(sinks->rtp_audio_), "RTP(audio) IPv4", "used-socket") ||
!attach_udpsink(&(sinks->rtp_audio_), "RTP(audio) IPv6", "used-socket-v6") ||
!attach_udpsink(&(sinks->rtcp_audio_), "RTCP(audio) IPv4", "used-socket") ||
!attach_udpsink(&(sinks->rtcp_audio_), "RTCP(audio) IPv6", "used-socket-v6")) {
return FALSE;
}
if(sinks->client_timeout_ > 0) {
if(!g_timeout_add_seconds(1, check_all_client_timeouts, sinks))
return FALSE;
}
return TRUE;
}
gboolean attach_udpsources(struct udp_sources *sources)
{
if(!sources)
return FALSE;
log_printf(WARNING, "udp source keep alive messages are not implemented yet!");
return TRUE;
}
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