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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <zmq.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#define NUM_FRAMES_PER_ZMQ_MESSAGE 4
struct zmq_dab_message_t
{
uint32_t version;
int16_t buflen[NUM_FRAMES_PER_ZMQ_MESSAGE];
uint8_t buf[NUM_FRAMES_PER_ZMQ_MESSAGE*6144];
};
void barf()
{
fprintf(stderr, "Error: %s\n", zmq_strerror(errno));
exit(1);
}
void do_subscriber(const char* host, int port)
{
int rc;
void* ctx = zmq_ctx_new();
void* sock = zmq_socket(ctx, ZMQ_SUB);
char endpoint[256];
snprintf(endpoint, 256, "tcp://%s:%d", host, port);
rc = zmq_connect(sock, endpoint);
fprintf(stderr, "connect %d\n", rc);
if (rc) barf();
rc = zmq_setsockopt(sock, ZMQ_SUBSCRIBE, NULL, 0);
fprintf(stderr, "subscribe %d\n", rc);
if (rc) barf();
const int framelen = NUM_FRAMES_PER_ZMQ_MESSAGE * 6144;
uint8_t eti[framelen];
struct zmq_dab_message_t message;
while (1) {
uint8_t* eti_p = eti;
memset(eti, 0x55, framelen);
rc = zmq_recv(sock, &message, framelen, 0);
fprintf(stderr, "rc=%d \n", rc);
if (rc > 0 && message.version == 1) {
uint8_t* buf = message.buf;
for (int i = 0; i < NUM_FRAMES_PER_ZMQ_MESSAGE; i++) {
memcpy(eti_p, buf, message.buflen[i]);
eti_p += 6144;
buf += message.buflen[i];
}
write(STDOUT_FILENO, eti, framelen);
}
else if (rc < 0) {
barf();
}
}
zmq_close(sock);
zmq_ctx_destroy(ctx);
}
void usage(char** argv)
{
fprintf(stderr, "usage: %s host port\n", argv[0]);
fprintf(stderr, "connects to dabmux ETI output at tcp://host:port using a ZeroMQ sub socket\n");
fprintf(stderr, "and outputs raw ETI on stdout\n");
exit(1);
}
int main(int argc, char** argv)
{
#ifdef GIT_VERSION
fprintf(stderr, "zmq-sub ETI reader version %s\n", GIT_VERSION);
#else
fprintf(stderr, "zmq-sub ETI reader version ?\n");
#endif
if (argc < 3) {
usage(argv);
}
char* host = argv[1];
int port = atoi(argv[2]);
fprintf(stderr, "connecting to tcp://%s:%d\n", host, port);
do_subscriber(host, port);
return 0;
}
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