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/*
* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
* Copyright (C) 2012-2013 by Hoernchen <la@tfc-server.de>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <signal.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#ifndef _WIN32
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <fcntl.h>
#else
#include <winsock2.h>
#include "getopt/getopt.h"
#endif
#include <pthread.h>
#include "rtl-sdr.h"
#include "convenience/convenience.h"
#ifdef _WIN32
#pragma comment(lib, "ws2_32.lib")
typedef int socklen_t;
#else
#define closesocket close
#define SOCKADDR struct sockaddr
#define SOCKET int
#define SOCKET_ERROR -1
#endif
static SOCKET s;
static pthread_t tcp_worker_thread;
static pthread_t command_thread;
static pthread_cond_t exit_cond;
static pthread_mutex_t exit_cond_lock;
static pthread_mutex_t ll_mutex;
static pthread_cond_t cond;
struct llist {
char *data;
size_t len;
struct llist *next;
};
typedef struct { /* structure size must be multiple of 2 bytes */
char magic[4];
uint32_t tuner_type;
uint32_t tuner_gain_count;
} dongle_info_t;
static rtlsdr_dev_t *dev = NULL;
static int enable_biastee = 0;
static int global_numq = 0;
static struct llist *ll_buffers = 0;
static int llbuf_num = 500;
static volatile int do_exit = 0;
void usage(void)
{
printf("rtl_tcp, an I/Q spectrum server for RTL2832 based DVB-T receivers\n\n"
"Usage:\t[-a listen address]\n"
"\t[-p listen port (default: 1234)]\n"
"\t[-f frequency to tune to [Hz]]\n"
"\t[-g gain (default: 0 for auto)]\n"
"\t[-s samplerate in Hz (default: 2048000 Hz)]\n"
"\t[-b number of buffers (default: 15, set by library)]\n"
"\t[-n max number of linked list buffers to keep (default: 500)]\n"
"\t[-d device index (default: 0)]\n"
"\t[-P ppm_error (default: 0)]\n"
"\t[-T enable bias-T on GPIO PIN 0 (works for rtl-sdr.com v3 dongles)]\n");
exit(1);
}
#ifdef _WIN32
int gettimeofday(struct timeval *tv, void* ignored)
{
FILETIME ft;
unsigned __int64 tmp = 0;
if (NULL != tv) {
GetSystemTimeAsFileTime(&ft);
tmp |= ft.dwHighDateTime;
tmp <<= 32;
tmp |= ft.dwLowDateTime;
tmp /= 10;
#ifdef _MSC_VER
tmp -= 11644473600000000Ui64;
#else
tmp -= 11644473600000000ULL;
#endif
tv->tv_sec = (long)(tmp / 1000000UL);
tv->tv_usec = (long)(tmp % 1000000UL);
}
return 0;
}
BOOL WINAPI
sighandler(int signum)
{
if (CTRL_C_EVENT == signum) {
fprintf(stderr, "Signal caught, exiting!\n");
do_exit = 1;
rtlsdr_cancel_async(dev);
return TRUE;
}
return FALSE;
}
#else
static void sighandler(int signum)
{
fprintf(stderr, "Signal caught, exiting!\n");
rtlsdr_cancel_async(dev);
do_exit = 1;
}
#endif
void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
{
if(!do_exit) {
struct llist *rpt = (struct llist*)malloc(sizeof(struct llist));
rpt->data = (char*)malloc(len);
memcpy(rpt->data, buf, len);
rpt->len = len;
rpt->next = NULL;
pthread_mutex_lock(&ll_mutex);
if (ll_buffers == NULL) {
ll_buffers = rpt;
} else {
struct llist *cur = ll_buffers;
int num_queued = 0;
while (cur->next != NULL) {
cur = cur->next;
num_queued++;
}
if(llbuf_num && llbuf_num == num_queued-2){
struct llist *curelem;
free(ll_buffers->data);
curelem = ll_buffers->next;
free(ll_buffers);
ll_buffers = curelem;
}
cur->next = rpt;
if (num_queued > global_numq)
printf("ll+, now %d\n", num_queued);
else if (num_queued < global_numq)
printf("ll-, now %d\n", num_queued);
global_numq = num_queued;
}
pthread_cond_signal(&cond);
pthread_mutex_unlock(&ll_mutex);
}
}
static void *tcp_worker(void *arg)
{
struct llist *curelem,*prev;
int bytesleft,bytessent, index;
struct timeval tv= {1,0};
struct timespec ts;
struct timeval tp;
fd_set writefds;
int r = 0;
while(1) {
if(do_exit)
pthread_exit(0);
pthread_mutex_lock(&ll_mutex);
gettimeofday(&tp, NULL);
ts.tv_sec = tp.tv_sec+5;
ts.tv_nsec = tp.tv_usec * 1000;
r = pthread_cond_timedwait(&cond, &ll_mutex, &ts);
if(r == ETIMEDOUT) {
pthread_mutex_unlock(&ll_mutex);
printf("worker cond timeout\n");
sighandler(0);
pthread_exit(NULL);
}
curelem = ll_buffers;
ll_buffers = 0;
pthread_mutex_unlock(&ll_mutex);
while(curelem != 0) {
bytesleft = curelem->len;
index = 0;
bytessent = 0;
while(bytesleft > 0) {
FD_ZERO(&writefds);
FD_SET(s, &writefds);
tv.tv_sec = 1;
tv.tv_usec = 0;
r = select(s+1, NULL, &writefds, NULL, &tv);
if(r) {
bytessent = send(s, &curelem->data[index], bytesleft, 0);
bytesleft -= bytessent;
index += bytessent;
}
if(bytessent == SOCKET_ERROR || do_exit) {
printf("worker socket bye\n");
sighandler(0);
pthread_exit(NULL);
}
}
prev = curelem;
curelem = curelem->next;
free(prev->data);
free(prev);
}
}
}
static int set_gain_by_index(rtlsdr_dev_t *_dev, unsigned int index)
{
int res = 0;
int* gains;
int count = rtlsdr_get_tuner_gains(_dev, NULL);
if (count > 0 && (unsigned int)count > index) {
gains = malloc(sizeof(int) * count);
count = rtlsdr_get_tuner_gains(_dev, gains);
res = rtlsdr_set_tuner_gain(_dev, gains[index]);
free(gains);
}
return res;
}
#ifdef _WIN32
#define __attribute__(x)
#pragma pack(push, 1)
#endif
struct command{
unsigned char cmd;
unsigned int param;
}__attribute__((packed));
#ifdef _WIN32
#pragma pack(pop)
#endif
static void *command_worker(void *arg)
{
int left, received = 0;
fd_set readfds;
struct command cmd={0, 0};
struct timeval tv= {1, 0};
int r = 0;
uint32_t tmp;
while(1) {
left=sizeof(cmd);
while(left >0) {
FD_ZERO(&readfds);
FD_SET(s, &readfds);
tv.tv_sec = 1;
tv.tv_usec = 0;
r = select(s+1, &readfds, NULL, NULL, &tv);
if(r) {
received = recv(s, (char*)&cmd+(sizeof(cmd)-left), left, 0);
left -= received;
}
if(received == SOCKET_ERROR || do_exit) {
printf("comm recv bye\n");
sighandler(0);
pthread_exit(NULL);
}
}
switch(cmd.cmd) {
case 0x01:
printf("set freq %d\n", ntohl(cmd.param));
rtlsdr_set_center_freq(dev,ntohl(cmd.param));
break;
case 0x02:
printf("set sample rate %d\n", ntohl(cmd.param));
rtlsdr_set_sample_rate(dev, ntohl(cmd.param));
break;
case 0x03:
printf("set gain mode %d\n", ntohl(cmd.param));
rtlsdr_set_tuner_gain_mode(dev, ntohl(cmd.param));
break;
case 0x04:
printf("set gain %d\n", ntohl(cmd.param));
rtlsdr_set_tuner_gain(dev, ntohl(cmd.param));
break;
case 0x05:
printf("set freq correction %d\n", ntohl(cmd.param));
rtlsdr_set_freq_correction(dev, ntohl(cmd.param));
break;
case 0x06:
tmp = ntohl(cmd.param);
printf("set if stage %d gain %d\n", tmp >> 16, (short)(tmp & 0xffff));
rtlsdr_set_tuner_if_gain(dev, tmp >> 16, (short)(tmp & 0xffff));
break;
case 0x07:
printf("set test mode %d\n", ntohl(cmd.param));
rtlsdr_set_testmode(dev, ntohl(cmd.param));
break;
case 0x08:
printf("set agc mode %d\n", ntohl(cmd.param));
rtlsdr_set_agc_mode(dev, ntohl(cmd.param));
break;
case 0x09:
printf("set direct sampling %d\n", ntohl(cmd.param));
rtlsdr_set_direct_sampling(dev, ntohl(cmd.param));
break;
case 0x0a:
printf("set offset tuning %d\n", ntohl(cmd.param));
rtlsdr_set_offset_tuning(dev, ntohl(cmd.param));
break;
case 0x0b:
printf("set rtl xtal %d\n", ntohl(cmd.param));
rtlsdr_set_xtal_freq(dev, ntohl(cmd.param), 0);
break;
case 0x0c:
printf("set tuner xtal %d\n", ntohl(cmd.param));
rtlsdr_set_xtal_freq(dev, 0, ntohl(cmd.param));
break;
case 0x0d:
printf("set tuner gain by index %d\n", ntohl(cmd.param));
set_gain_by_index(dev, ntohl(cmd.param));
break;
case 0x0e:
printf("set bias tee %d\n", ntohl(cmd.param));
rtlsdr_set_bias_tee(dev, (int)ntohl(cmd.param));
break;
default:
break;
}
cmd.cmd = 0xff;
}
}
int main(int argc, char **argv)
{
int r, opt, i;
char* addr = "127.0.0.1";
int port = 1234;
uint32_t frequency = 100000000, samp_rate = 2048000;
struct sockaddr_in local, remote;
uint32_t buf_num = 0;
int dev_index = 0;
int dev_given = 0;
int gain = 0;
int ppm_error = 0;
struct llist *curelem,*prev;
pthread_attr_t attr;
void *status;
struct timeval tv = {1,0};
struct linger ling = {1,0};
SOCKET listensocket;
socklen_t rlen;
fd_set readfds;
u_long blockmode = 1;
dongle_info_t dongle_info;
#ifdef _WIN32
WSADATA wsd;
i = WSAStartup(MAKEWORD(2,2), &wsd);
#else
struct sigaction sigact, sigign;
#endif
while ((opt = getopt(argc, argv, "a:p:f:g:s:b:n:d:P:T")) != -1) {
switch (opt) {
case 'd':
dev_index = verbose_device_search(optarg);
dev_given = 1;
break;
case 'f':
frequency = (uint32_t)atofs(optarg);
break;
case 'g':
gain = (int)(atof(optarg) * 10); /* tenths of a dB */
break;
case 's':
samp_rate = (uint32_t)atofs(optarg);
break;
case 'a':
addr = optarg;
break;
case 'p':
port = atoi(optarg);
break;
case 'b':
buf_num = atoi(optarg);
break;
case 'n':
llbuf_num = atoi(optarg);
break;
case 'P':
ppm_error = atoi(optarg);
break;
case 'T':
enable_biastee = 1;
break;
default:
usage();
break;
}
}
if (argc < optind)
usage();
if (!dev_given) {
dev_index = verbose_device_search("0");
}
if (dev_index < 0) {
exit(1);
}
rtlsdr_open(&dev, (uint32_t)dev_index);
if (NULL == dev) {
fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dev_index);
exit(1);
}
#ifndef _WIN32
sigact.sa_handler = sighandler;
sigemptyset(&sigact.sa_mask);
sigact.sa_flags = 0;
sigign.sa_handler = SIG_IGN;
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
sigaction(SIGQUIT, &sigact, NULL);
sigaction(SIGPIPE, &sigign, NULL);
#else
SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
#endif
/* Set the tuner error */
verbose_ppm_set(dev, ppm_error);
/* Set the sample rate */
r = rtlsdr_set_sample_rate(dev, samp_rate);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set sample rate.\n");
/* Set the frequency */
r = rtlsdr_set_center_freq(dev, frequency);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set center freq.\n");
else
fprintf(stderr, "Tuned to %i Hz.\n", frequency);
if (0 == gain) {
/* Enable automatic gain */
r = rtlsdr_set_tuner_gain_mode(dev, 0);
if (r < 0)
fprintf(stderr, "WARNING: Failed to enable automatic gain.\n");
} else {
/* Enable manual gain */
r = rtlsdr_set_tuner_gain_mode(dev, 1);
if (r < 0)
fprintf(stderr, "WARNING: Failed to enable manual gain.\n");
/* Set the tuner gain */
r = rtlsdr_set_tuner_gain(dev, gain);
if (r < 0)
fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
else
fprintf(stderr, "Tuner gain set to %f dB.\n", gain/10.0);
}
rtlsdr_set_bias_tee(dev, enable_biastee);
if (enable_biastee)
fprintf(stderr, "activated bias-T on GPIO PIN 0\n");
/* Reset endpoint before we start reading from it (mandatory) */
r = rtlsdr_reset_buffer(dev);
if (r < 0)
fprintf(stderr, "WARNING: Failed to reset buffers.\n");
pthread_mutex_init(&exit_cond_lock, NULL);
pthread_mutex_init(&ll_mutex, NULL);
pthread_mutex_init(&exit_cond_lock, NULL);
pthread_cond_init(&cond, NULL);
pthread_cond_init(&exit_cond, NULL);
memset(&local,0,sizeof(local));
local.sin_family = AF_INET;
local.sin_port = htons(port);
local.sin_addr.s_addr = inet_addr(addr);
listensocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
r = 1;
setsockopt(listensocket, SOL_SOCKET, SO_REUSEADDR, (char *)&r, sizeof(int));
setsockopt(listensocket, SOL_SOCKET, SO_LINGER, (char *)&ling, sizeof(ling));
bind(listensocket,(struct sockaddr *)&local,sizeof(local));
#ifdef _WIN32
ioctlsocket(listensocket, FIONBIO, &blockmode);
#else
r = fcntl(listensocket, F_GETFL, 0);
r = fcntl(listensocket, F_SETFL, r | O_NONBLOCK);
#endif
while(1) {
printf("listening...\n");
printf("Use the device argument 'rtl_tcp=%s:%d' in OsmoSDR "
"(gr-osmosdr) source\n"
"to receive samples in GRC and control "
"rtl_tcp parameters (frequency, gain, ...).\n",
addr, port);
listen(listensocket,1);
while(1) {
FD_ZERO(&readfds);
FD_SET(listensocket, &readfds);
tv.tv_sec = 1;
tv.tv_usec = 0;
r = select(listensocket+1, &readfds, NULL, NULL, &tv);
if(do_exit) {
goto out;
} else if(r) {
rlen = sizeof(remote);
s = accept(listensocket,(struct sockaddr *)&remote, &rlen);
break;
}
}
setsockopt(s, SOL_SOCKET, SO_LINGER, (char *)&ling, sizeof(ling));
printf("client accepted!\n");
memset(&dongle_info, 0, sizeof(dongle_info));
memcpy(&dongle_info.magic, "RTL0", 4);
r = rtlsdr_get_tuner_type(dev);
if (r >= 0)
dongle_info.tuner_type = htonl(r);
r = rtlsdr_get_tuner_gains(dev, NULL);
if (r >= 0)
dongle_info.tuner_gain_count = htonl(r);
r = send(s, (const char *)&dongle_info, sizeof(dongle_info), 0);
if (sizeof(dongle_info) != r)
printf("failed to send dongle information\n");
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
r = pthread_create(&tcp_worker_thread, &attr, tcp_worker, NULL);
r = pthread_create(&command_thread, &attr, command_worker, NULL);
pthread_attr_destroy(&attr);
r = rtlsdr_read_async(dev, rtlsdr_callback, NULL, buf_num, 0);
pthread_join(tcp_worker_thread, &status);
pthread_join(command_thread, &status);
closesocket(s);
printf("all threads dead..\n");
curelem = ll_buffers;
ll_buffers = 0;
while(curelem != 0) {
prev = curelem;
curelem = curelem->next;
free(prev->data);
free(prev);
}
do_exit = 0;
global_numq = 0;
}
out:
rtlsdr_close(dev);
closesocket(listensocket);
closesocket(s);
#ifdef _WIN32
WSACleanup();
#endif
printf("bye!\n");
return r >= 0 ? r : -r;
}