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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "output.h"
#include "simplebuffer.h"
#include "socket.h"
#if 0
static inline void sout_send_tsp_rtp(struct stream_s *s, uint8_t *tsp) {
}
static void sout_sock_read(int fd, short event, void *arg) {
struct stream_s *s=arg;
ssize_t size;
struct sockaddr_in sin;
socklen_t sinlen=sizeof(struct sockaddr_in);
size=recvfrom(fd, s->ctlbuf, MAX_CTL_MSG_SIZE,
0, (struct sockaddr *) &sin, &sinlen);
sout_parse_rtcp(s, s->ctlbuf, size, &sin);
}
static int sout_init_socket(struct stream_s *s) {
struct sockaddr_in sin;
memset(&sin, 0, sizeof(struct sockaddr_in));
s->sockfd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
sin.sin_port=htons(s->port);
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=s->groupinaddr.s_addr;
if (s->dist == STREAM_DIST_LISTEN) {
/* Open control aka RTCP socket. I reverse engineered
* that this is group socket + 1 */
s->ctlfd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
sin.sin_port=htons(s->port+1);
bind(s->ctlfd, (struct sockaddr *) &sin,
sizeof(struct sockaddr_in));
/* Add callback for packet receiption on control socket e.g. RTCP */
event_set(&s->ctlevent, s->ctlfd, EV_READ|EV_PERSIST,
sout_sock_read, s);
event_add(&s->ctlevent, NULL);
} else {
/* MCAST - Set destination */
connect(s->sockfd, (struct sockaddr *) &sin, sizeof(struct sockaddr_in));
if (s->dist == STREAM_DIST_MCAST) {
/*
* Set socket TTL - Be warned - I DoSed a Cisco 5500 RSM by sending
* a 60MBit/s stream in 14 Groups all with TTL of 1 and the switch
* went to lala land. It seems dropping MCAST traffic is very expensive
* in IOS 12.1 land and its even dropped in Layer 3 instead of Layer 2 although
* nobody expects ICMP "TTL expired" for MCAST traffic
*
*/
setsockopt(s->sockfd, IPPROTO_IP, IP_MULTICAST_TTL,
&s->ttl, sizeof(s->ttl));
}
}
return 1;
}
#endif
int output_rtp_new_receiver(struct output_s *o,
char *addr, int port, uint32_t ssrc) {
struct rtp_receiver_s *r;
r=calloc(1, sizeof(struct rtp_receiver_s));
/* Copy address and port */
r->addr=strdup(addr);
r->port=port;
r->ssrc=ssrc;
r->lastrr=time(NULL);
/* Create sockaddr_in struct for later sendmsg */
r->sin.sin_family=AF_INET;
inet_aton(r->addr, &r->sin.sin_addr);
r->sin.sin_port=htons(r->port);
r->sinlen=sizeof(struct sockaddr_in);
/* Prepend receiver to receiver list */
r->next=o->rtpreceiver;
o->rtpreceiver=r;
/* We want to receive packets */
o->receiver++;
return 0;
}
#if 0
static struct rtp_receiver_s *output_rtp_find_rtpr(struct output_s *o, uint32_t ssrc) {
struct rtp_receiver_s *r;
for(r=o->rtpreceiver;r;r=r->next)
if (r->ssrc == ssrc)
return r;
return NULL;
}
static void output_rtp_free_rtpr(struct output_s *o, uint32_t ssrc) {
struct rtp_receiver_s *r, *lr;
for(r=o->rtpreceiver,lr=NULL;r;r=r->next) {
if (r->ssrc == ssrc) {
if (lr)
lr->next=r->next;
free(r);
return;
}
lr=r;
}
}
static void output_rtp_parse_rtcp(struct output_s *o, uint8_t *b,
int len, struct sockaddr_in *sin) {
struct rtp_receiver_s *r;
uint32_t ssrc;
logwrite(LOG_DEBUG, "streamrtp: got rtcp packet version %d\n", RTCP_VERSION(b));
/* Version 2 ? */
if (RTCP_VERSION(b) != 2)
return;
/* Get SSRC from RTCP packet */
ssrc=b[3]<<24 | b[4]<<16 | b[5]<<8 | b[6];
switch(RTCP_PT(b)) {
case(RTP_PT_RR):
logwrite(LOG_DEBUG, "streamrtp: Got Receiver Report size %d from %s ssrc %08x\n",
len, inet_ntoa(sin->sin_addr), ssrc);
r=output_rtp_find_rtpr(o, ssrc);
if (!r) {
logwrite(LOG_INFO, "streamrtp: Createing new RTP Receiver %08x\n", ssrc);
output_rtp_new_receiver(o,
inet_ntoa(sin->sin_addr),
ntohs(sin->sin_port)-1,
ssrc);
} else {
/* Store last RR timestamp */
r->lastrr=time(NULL);
}
break;
case(RTP_PT_BYE):
logwrite(LOG_INFO, "streamrtp: Got Bye size %d from %s ssrc %08x\n",
len, inet_ntoa(sin->sin_addr), ssrc);
/* Find receiver struct */
output_rtp_free_rtpr(o, ssrc);
break;
}
}
static void output_rtp_read_rtcp(int fd, short event, void *arg) {
struct output_s *o=arg;
ssize_t size;
struct sockaddr_in sin;
socklen_t sinlen=sizeof(struct sockaddr_in);
size=recvfrom(fd, o->rtcpbuffer, RTCP_BUFFER_SIZE,
0, (struct sockaddr *) &sin, &sinlen);
logwrite(LOG_DEBUG, "streamrtp: got packet size %d\n", size);
output_rtp_parse_rtcp(o, o->rtcpbuffer, size, &sin);
}
static void output_init_rtp_rtcp(struct output_s *o) {
struct sockaddr_in sin;
/* Allocate the RTCP incoming packet buffer */
o->rtcpbuffer=malloc(RTCP_BUFFER_SIZE);
memset(&sin, 0, sizeof(struct sockaddr_in));
sin.sin_family=AF_INET;
sin.sin_addr.s_addr=INADDR_ANY;
sin.sin_port=htons(o->rtcpport);
/* Create a socket and bind */
o->rtcpfd=socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP);
bind(o->rtcpfd, (struct sockaddr *) &sin, sizeof(struct sockaddr_in));
/* Install rtcp callback */
event_set(&o->rtcpevent, o->rtcpfd,
EV_READ|EV_PERSIST, output_rtp_read_rtcp, o);
event_add(&o->rtcpevent, NULL);
}
#endif
int output_init_rtp(struct output_s *o) {
o->sockfd=socket_open(o->localaddr, 0);
if (o->sockfd < 0)
return -1;
socket_set_nonblock(o->sockfd);
socket_set_ttl(o->sockfd, o->ttl);
/* Join multicast group if its a multicast address */
socket_join_multicast(o->sockfd, o->remoteaddr),
/* Do you have a better idea ? */
o->rtpssrc=(uint32_t) random();
o->buffer=sb_init(RTP_MAX_TS, TS_PACKET_SIZE, RTP_HEADROOM);
output_rtp_new_receiver(o,
o->remoteaddr, o->remoteport, 0);
return 0;
}
void output_send_rtp(struct output_s *o, uint8_t *tsp) {
sb_add_atoms(o->buffer, tsp, 1);
/* check whether another packet would fit ? */
if (!sb_free_atoms(o->buffer)) {
struct rtp_receiver_s *r;
struct timeval tv;
long msec;
uint8_t *b=sb_bufptr(o->buffer);
gettimeofday(&tv, (struct timezone *) NULL);
msec=(tv.tv_sec%1000000)*1000 + tv.tv_usec/1000;
b[RTP_VERSION_OFF] = 0x80;
b[RTP_PT_OFF] = RTP_PT_MP2T; /* RFC 2250 */
b[RTP_SEQ_OFF] = o->rtpseq >> 8 & 0xff;
b[RTP_SEQ_OFF+1] = o->rtpseq & 0xff;
b[RTP_TSTAMP_OFF] = msec>>24 & 0xff;
b[RTP_TSTAMP_OFF+1] = msec>>16 & 0xff;
b[RTP_TSTAMP_OFF+2] = msec>>8 & 0xff;
b[RTP_TSTAMP_OFF+3] = msec & 0xff;
b[RTP_SSRC_OFF] = o->rtpssrc>>24 & 0xff;
b[RTP_SSRC_OFF+1] = o->rtpssrc>>16 & 0xff;
b[RTP_SSRC_OFF+2] = o->rtpssrc>>8 & 0xff;
b[RTP_SSRC_OFF+3] = o->rtpssrc & 0xff;
for(r=o->rtpreceiver;r;r=r->next) {
int len;
len=sendto(o->sockfd, sb_bufptr(o->buffer), sb_buflen(o->buffer),
MSG_DONTWAIT,
(struct sockaddr *) &r->sin, r->sinlen);
}
sb_zap(o->buffer);
o->rtpseq++;
}
}
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