aboutsummaryrefslogtreecommitdiffstats
path: root/src/rtl_tcp.c
blob: da6057bede1a3207b7673aeb06bd1371c6f885bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
/*
 * 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;
}