consolidate program arguments

1 files changed, 267 insertions, 0 deletions

diff --git a/src/rtl_sdr.c b/src/rtl_sdr.c
new file mode 100644
index 0000000..232ab77
--- /dev/null
+++ b/src/rtl_sdr.c
@@ -0,0 +1,267 @@
+/*
+ * rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
+ * Copyright (C) 2012 by Steve Markgraf <steve@steve-m.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>
+#include <math.h>
+
+#ifndef _WIN32
+#include <unistd.h>
+#else
+#include <Windows.h>
+#endif
+
+#include "rtl-sdr.h"
+
+#define DEFAULT_SAMPLE_RATE		2048000
+#define DEFAULT_ASYNC_BUF_NUMBER	32
+#define DEFAULT_BUF_LENGTH		(16 * 16384)
+#define MINIMAL_BUF_LENGTH		512
+#define MAXIMAL_BUF_LENGTH		(256 * 16384)
+
+static int do_exit = 0;
+static rtlsdr_dev_t *dev = NULL;
+
+void usage(void)
+{
+	#ifdef _WIN32
+	fprintf(stderr,"rtl-sdr, an I/Q recorder for RTL2832 based USB-sticks\n\n"
+		"Usage:\t rtl-sdr-win.exe [device_index] [samplerate in kHz] "
+		"[gain] [frequency in Hz] [filename]\n");
+	#else
+	fprintf(stderr,
+		"rtl-sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n"
+		"Usage:\t -f frequency_to_tune_to [Hz]\n"
+		"\t[-s samplerate (default: 2048000 Hz)]\n"
+		"\t[-d device_index (default: 0)]\n"
+		"\t[-g tuner_gain (default: 0 dB)]\n"
+		"\t[-b output_block_size (default: 16 * 16384)]\n"
+		"\t[-S force sync output (default: async)]\n"
+		"\tfilename (a '-' dumps samples to stdout)\n\n");
+#endif
+	exit(1);
+}
+
+#ifdef _WIN32
+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");
+	do_exit = 1;
+	rtlsdr_cancel_async(dev);
+}
+#endif
+
+static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
+{
+	if (ctx) {
+		if (fwrite(buf, 1, len, (FILE*)ctx) != len) {
+			fprintf(stderr, "Short write, samples lost, exiting!\n");
+			rtlsdr_cancel_async(dev);
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+#ifndef _WIN32
+	struct sigaction sigact;
+#endif
+	char *filename = NULL;
+	int n_read;
+	int r, opt;
+	int i, gain = 0;
+	int sync_mode = 0;
+	FILE *file;
+	uint8_t *buffer;
+	uint32_t dev_index = 0;
+	uint32_t frequency = 0;
+	uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
+	uint32_t out_block_size = DEFAULT_BUF_LENGTH;
+	int device_count;
+#ifndef _WIN32
+	while ((opt = getopt(argc, argv, "d:f:g:s:b:S::")) != -1) {
+		switch (opt) {
+		case 'd':
+			dev_index = atoi(optarg);
+			break;
+		case 'f':
+			frequency = (uint32_t)atof(optarg);
+			break;
+		case 'g':
+			gain = (int)atof(optarg) * 10;
+			break;
+		case 's':
+			samp_rate = (uint32_t)atof(optarg);
+			break;
+		case 'b':
+			out_block_size = (uint32_t)atof(optarg);
+			break;
+		case 'S':
+			sync_mode = 1;
+			break;
+		default:
+			usage();
+			break;
+		}
+	}
+
+	if (argc <= optind) {
+		usage();
+	} else {
+		filename = argv[optind];
+	}
+#else
+	if(argc <6)
+		usage();
+	dev_index = atoi(argv[1]);
+	samp_rate = atoi(argv[2])*1000;
+	gain=(int)atof(argv[3]) * 10;
+	frequency = atoi(argv[4]);
+	filename = argv[5];
+#endif
+	if(out_block_size < MINIMAL_BUF_LENGTH ||
+	   out_block_size > MAXIMAL_BUF_LENGTH ){
+		fprintf(stderr,
+			"Output block size wrong value, falling back to default\n");
+		fprintf(stderr,
+			"Minimal length: %u\n", MINIMAL_BUF_LENGTH);
+		fprintf(stderr,
+			"Maximal length: %u\n", MAXIMAL_BUF_LENGTH);
+		out_block_size = DEFAULT_BUF_LENGTH;
+	}
+
+	buffer = malloc(out_block_size * sizeof(uint8_t));
+
+	device_count = rtlsdr_get_device_count();
+	if (!device_count) {
+		fprintf(stderr, "No supported devices found.\n");
+		exit(1);
+	}
+
+	fprintf(stderr, "Found %d device(s):\n", device_count);
+	for (i = 0; i < device_count; i++)
+		fprintf(stderr, "  %d:  %s\n", i, rtlsdr_get_device_name(i));
+	fprintf(stderr, "\n");
+
+	fprintf(stderr, "Using device %d: %s\n",
+		dev_index,
+		rtlsdr_get_device_name(dev_index));
+
+	r = rtlsdr_open(&dev, dev_index);
+	if (r < 0) {
+		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;
+	sigaction(SIGINT, &sigact, NULL);
+	sigaction(SIGTERM, &sigact, NULL);
+	sigaction(SIGQUIT, &sigact, NULL);
+	sigaction(SIGPIPE, &sigact, NULL);
+#else
+	SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
+#endif
+	/* 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 %u Hz.\n", frequency);
+
+	/* 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 %i dB.\n", gain);
+
+	if(strcmp(filename, "-") == 0) { /* Write samples to stdout */
+		file = stdout;
+	} else {
+		file = fopen(filename, "wb");
+		if (!file) {
+			fprintf(stderr, "Failed to open %s\n", filename);
+			goto out;
+		}
+	}
+
+	/* 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");
+
+	if (sync_mode) {
+		fprintf(stderr, "Reading samples in sync mode...\n");
+		while (!do_exit) {
+			r = rtlsdr_read_sync(dev, buffer, out_block_size, &n_read);
+			if (r < 0) {
+				fprintf(stderr, "WARNING: sync read failed.\n");
+				break;
+			}
+
+			if (fwrite(buffer, 1, n_read, file) != (size_t)n_read) {
+				fprintf(stderr, "Short write, samples lost, exiting!\n");
+				break;
+			}
+
+			if ((uint32_t)n_read < out_block_size) {
+				fprintf(stderr, "Short read, samples lost, exiting!\n");
+				break;
+			}
+		}
+	} else {
+		fprintf(stderr, "Reading samples in async mode...\n");
+		r = rtlsdr_read_async(dev, rtlsdr_callback, (void *)file,
+				      DEFAULT_ASYNC_BUF_NUMBER, out_block_size);
+	}
+
+	if (do_exit)
+		fprintf(stderr, "\nUser cancel, exiting...\n");
+	else
+		fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
+
+	if (file != stdout)
+		fclose(file);
+
+	rtlsdr_close(dev);
+	free (buffer);
+out:
+	return r >= 0 ? r : -r;
+}