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我希望發送UDP多播數據包到環回地址並在其他應用程序中接收相同的數據。所有測試都在Fedora Core 17 Linux上完成。環回設備上的多播
這個想法是通過RTSP/HTTP或任何其他網絡協議接收視頻流，並在環回地址上多播它，以便我可以使用VLC使用多播地址播放流。撇開其他比特率和受控組播問題，我試圖讀取一個視頻文件和多播環回設備上。但是當試圖在vlc上播放它時，它沒有奏效。我能看到包在Wireshark中得到傳播，但源IP是從我的默認網絡接口取（即接口這是我的默認網關）
我已經嘗試下面的命令
須藤使用ifconfig羅播 sudo ip route add 239.252.10.10 dev lo
在這方面的任何建議都會非常有幫助。
測試程序代碼粘貼以下
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define MULTICAST_ADDRESS "239.252.10.10"
#define UDP_PORT 1234
#define INTERFACE_IP "127.0.0.1"
#define MTU 1474
#define DATA_BUFFER_SIZE (1024*1024)
static int socket_init(char *intf_ip) {
int sd;
struct in_addr localInterface;
sd = socket (AF_INET, SOCK_DGRAM, 0);
if (sd < 0) {
perror ("Opening datagram socket error");
return -1;
}
else
printf ("Opening the datagram socket...OK.\n");
localInterface.s_addr = inet_addr (intf_ip);
if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF, (char *) &localInterface,sizeof (localInterface)) < 0){
perror ("Setting local interface error");
close(sd);
return -1;
}
else
printf ("Setting the local interface...OK\n");
#if 1
char loopch = 1;
if(setsockopt(sd, IPPROTO_IP, IP_MULTICAST_LOOP, (char *)&loopch, sizeof(loopch)) < 0){
perror("Setting IP_MULTICAST_LOOP error");
close(sd);
return -1;
}
else
printf("Enabling the loopback...OK.\n");
#endif
return sd;
}
static int transmit_packet(int sd, char *databuf, int size,char *ip, unsigned short port){
struct sockaddr_in groupSock;
int len,datalen,rc;
memset ((char *) &groupSock, 0, sizeof (groupSock));
groupSock.sin_family = AF_INET;
groupSock.sin_addr.s_addr = inet_addr (ip);
groupSock.sin_port = htons (port);
len=0;
datalen = MTU;
if(size < MTU)
datalen = size;
while(len < size){
rc = sendto(sd, databuf, datalen, 0, (struct sockaddr *) &groupSock,sizeof (groupSock));
if(rc <0){
perror ("Sending datagram message error");
return -1;
}
usleep(10000);
len += rc;
}
return len;
}
static int transmit_file(char *filepath, char *dstip, char *srcip,unsigned short port) {
FILE *fp;
int sd,rc;
char *databuf;
fp = fopen(filepath, "r");
if(!fp) {
printf("transmit_file : no such file or directory %s \n",filepath);
return -1;
}
sd = socket_init(srcip);
if(sd < 0) {
printf("Socket initialization failed \n");
fclose(fp);
return -1;
}
databuf = (char*) malloc(sizeof(char)*DATA_BUFFER_SIZE);
if(!databuf) {
printf("Unable to allocate databuf\n");
close(sd);fclose(fp);
return -1;
}
while(!feof(fp)){
rc = fread(databuf,1,DATA_BUFFER_SIZE,fp);
if(rc<= 0) {
printf("read failed or EOF reached\n");
break;
}
if(transmit_packet(sd,databuf,rc,dstip,port) <0)
printf("Transmit failed\n");
}
close(sd);fclose(fp);
free(databuf);
return 0;
}
int main(int argc, char *argv[]){
if(argc != 3){
printf("%s <filename> <ip>\n",argv[0]);
return -1;
}
transmit_file(argv[1],argv[2],INTERFACE_IP,UDP_PORT);
return 0;
}
你有什麼解決方案？我也有同樣的問題。 – user2990252