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267 lines
6.5 KiB
267 lines
6.5 KiB
/*
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* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
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* Copyright (C) 2012 by Steve Markgraf <steve@steve-m.de>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <errno.h>
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#include <signal.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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#ifndef _WIN32
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#include <unistd.h>
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#else
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#include <Windows.h>
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#endif
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#include "rtl-sdr.h"
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#define DEFAULT_SAMPLE_RATE 2048000
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#define DEFAULT_ASYNC_BUF_NUMBER 32
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#define DEFAULT_BUF_LENGTH (16 * 16384)
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#define MINIMAL_BUF_LENGTH 512
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#define MAXIMAL_BUF_LENGTH (256 * 16384)
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static int do_exit = 0;
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static rtlsdr_dev_t *dev = NULL;
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void usage(void)
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{
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#ifdef _WIN32
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fprintf(stderr,"rtl-sdr, an I/Q recorder for RTL2832 based USB-sticks\n\n"
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"Usage:\t rtl-sdr-win.exe [device_index] [samplerate in kHz] "
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"[gain] [frequency in Hz] [filename]\n");
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#else
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fprintf(stderr,
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"rtl-sdr, an I/Q recorder for RTL2832 based DVB-T receivers\n\n"
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"Usage:\t -f frequency_to_tune_to [Hz]\n"
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"\t[-s samplerate (default: 2048000 Hz)]\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-g tuner_gain (default: 0 dB)]\n"
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"\t[-b output_block_size (default: 16 * 16384)]\n"
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"\t[-S force sync output (default: async)]\n"
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"\tfilename (a '-' dumps samples to stdout)\n\n");
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#endif
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exit(1);
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}
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#ifdef _WIN32
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BOOL WINAPI
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sighandler(int signum)
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{
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if (CTRL_C_EVENT == signum) {
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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rtlsdr_cancel_async(dev);
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return TRUE;
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}
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return FALSE;
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}
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#else
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static void sighandler(int signum)
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{
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fprintf(stderr, "Signal caught, exiting!\n");
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do_exit = 1;
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rtlsdr_cancel_async(dev);
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}
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#endif
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static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
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{
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if (ctx) {
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if (fwrite(buf, 1, len, (FILE*)ctx) != len) {
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fprintf(stderr, "Short write, samples lost, exiting!\n");
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rtlsdr_cancel_async(dev);
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}
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}
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}
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int main(int argc, char **argv)
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{
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#ifndef _WIN32
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struct sigaction sigact;
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#endif
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char *filename = NULL;
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int n_read;
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int r, opt;
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int i, gain = 0;
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int sync_mode = 0;
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FILE *file;
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uint8_t *buffer;
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uint32_t dev_index = 0;
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uint32_t frequency = 0;
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uint32_t samp_rate = DEFAULT_SAMPLE_RATE;
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uint32_t out_block_size = DEFAULT_BUF_LENGTH;
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int device_count;
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#ifndef _WIN32
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while ((opt = getopt(argc, argv, "d:f:g:s:b:S::")) != -1) {
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switch (opt) {
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case 'd':
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dev_index = atoi(optarg);
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break;
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case 'f':
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frequency = (uint32_t)atof(optarg);
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break;
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case 'g':
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gain = (int)atof(optarg) * 10;
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break;
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case 's':
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samp_rate = (uint32_t)atof(optarg);
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break;
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case 'b':
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out_block_size = (uint32_t)atof(optarg);
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break;
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case 'S':
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sync_mode = 1;
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break;
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default:
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usage();
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break;
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}
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}
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if (argc <= optind) {
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usage();
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} else {
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filename = argv[optind];
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}
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#else
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if(argc <6)
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usage();
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dev_index = atoi(argv[1]);
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samp_rate = atoi(argv[2])*1000;
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gain=(int)atof(argv[3]) * 10;
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frequency = atoi(argv[4]);
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filename = argv[5];
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#endif
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if(out_block_size < MINIMAL_BUF_LENGTH ||
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out_block_size > MAXIMAL_BUF_LENGTH ){
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fprintf(stderr,
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"Output block size wrong value, falling back to default\n");
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fprintf(stderr,
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"Minimal length: %u\n", MINIMAL_BUF_LENGTH);
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fprintf(stderr,
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"Maximal length: %u\n", MAXIMAL_BUF_LENGTH);
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out_block_size = DEFAULT_BUF_LENGTH;
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}
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buffer = malloc(out_block_size * sizeof(uint8_t));
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device_count = rtlsdr_get_device_count();
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if (!device_count) {
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fprintf(stderr, "No supported devices found.\n");
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exit(1);
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}
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fprintf(stderr, "Found %d device(s):\n", device_count);
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for (i = 0; i < device_count; i++)
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fprintf(stderr, " %d: %s\n", i, rtlsdr_get_device_name(i));
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fprintf(stderr, "\n");
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fprintf(stderr, "Using device %d: %s\n",
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dev_index,
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rtlsdr_get_device_name(dev_index));
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r = rtlsdr_open(&dev, dev_index);
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if (r < 0) {
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fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dev_index);
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exit(1);
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}
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#ifndef _WIN32
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sigact.sa_handler = sighandler;
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sigemptyset(&sigact.sa_mask);
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sigact.sa_flags = 0;
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sigaction(SIGINT, &sigact, NULL);
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sigaction(SIGTERM, &sigact, NULL);
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sigaction(SIGQUIT, &sigact, NULL);
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sigaction(SIGPIPE, &sigact, NULL);
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#else
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SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
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#endif
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/* Set the sample rate */
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r = rtlsdr_set_sample_rate(dev, samp_rate);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to set sample rate.\n");
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/* Set the frequency */
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r = rtlsdr_set_center_freq(dev, frequency);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to set center freq.\n");
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else
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fprintf(stderr, "Tuned to %u Hz.\n", frequency);
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/* Set the tuner gain */
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r = rtlsdr_set_tuner_gain(dev, gain);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to set tuner gain.\n");
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else
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fprintf(stderr, "Tuner gain set to %i dB.\n", gain);
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if(strcmp(filename, "-") == 0) { /* Write samples to stdout */
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file = stdout;
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} else {
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file = fopen(filename, "wb");
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if (!file) {
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fprintf(stderr, "Failed to open %s\n", filename);
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goto out;
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}
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}
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/* Reset endpoint before we start reading from it (mandatory) */
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r = rtlsdr_reset_buffer(dev);
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if (r < 0)
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fprintf(stderr, "WARNING: Failed to reset buffers.\n");
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if (sync_mode) {
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fprintf(stderr, "Reading samples in sync mode...\n");
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while (!do_exit) {
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r = rtlsdr_read_sync(dev, buffer, out_block_size, &n_read);
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if (r < 0) {
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fprintf(stderr, "WARNING: sync read failed.\n");
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break;
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}
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if (fwrite(buffer, 1, n_read, file) != (size_t)n_read) {
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fprintf(stderr, "Short write, samples lost, exiting!\n");
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break;
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}
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if ((uint32_t)n_read < out_block_size) {
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fprintf(stderr, "Short read, samples lost, exiting!\n");
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break;
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}
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}
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} else {
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fprintf(stderr, "Reading samples in async mode...\n");
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r = rtlsdr_read_async(dev, rtlsdr_callback, (void *)file,
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DEFAULT_ASYNC_BUF_NUMBER, out_block_size);
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}
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if (do_exit)
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fprintf(stderr, "\nUser cancel, exiting...\n");
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else
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fprintf(stderr, "\nLibrary error %d, exiting...\n", r);
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if (file != stdout)
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fclose(file);
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rtlsdr_close(dev);
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free (buffer);
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out:
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return r >= 0 ? r : -r;
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}
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