1287 lines
32 KiB
C
1287 lines
32 KiB
C
/*
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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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* Copyright (C) 2012 by Hoernchen <la@tfc-server.de>
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* Copyright (C) 2012 by Kyle Keen <keenerd@gmail.com>
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* Copyright (C) 2013 by Elias Oenal <EliasOenal@gmail.com>
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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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/*
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* written because people could not do real time
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* FM demod on Atom hardware with GNU radio
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* based on rtl_sdr.c and rtl_tcp.c
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*
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* lots of locks, but that is okay
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* (no many-to-many locks)
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*
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* todo:
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* sanity checks
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* scale squelch to other input parameters
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* test all the demodulations
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* pad output on hop
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* frequency ranges could be stored better
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* scaled AM demod amplification
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* auto-hop after time limit
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* peak detector to tune onto stronger signals
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* fifo for active hop frequency
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* clips
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* noise squelch
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* merge stereo patch
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* merge soft agc patch
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* merge udp patch
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* testmode to detect overruns
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* watchdog to reset bad dongle
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* fix oversampling
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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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#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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#include <fcntl.h>
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#include <io.h>
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#include "getopt/getopt.h"
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#define usleep(x) Sleep(x/1000)
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#if defined(_MSC_VER) && (_MSC_VER < 1800)
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#define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5))
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#endif
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#define _USE_MATH_DEFINES
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#endif
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#include <math.h>
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#include <pthread.h>
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#include <libusb.h>
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#include "rtl-sdr.h"
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#include "convenience/convenience.h"
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#define DEFAULT_SAMPLE_RATE 24000
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#define DEFAULT_BUF_LENGTH (1 * 16384)
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#define MAXIMUM_OVERSAMPLE 16
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#define MAXIMUM_BUF_LENGTH (MAXIMUM_OVERSAMPLE * DEFAULT_BUF_LENGTH)
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#define AUTO_GAIN -100
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#define BUFFER_DUMP 4096
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#define FREQUENCIES_LIMIT 1000
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static volatile int do_exit = 0;
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static int lcm_post[17] = {1,1,1,3,1,5,3,7,1,9,5,11,3,13,7,15,1};
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static int ACTUAL_BUF_LENGTH;
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static int *atan_lut = NULL;
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static int atan_lut_size = 131072; /* 512 KB */
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static int atan_lut_coef = 8;
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struct dongle_state
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{
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int exit_flag;
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pthread_t thread;
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rtlsdr_dev_t *dev;
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int dev_index;
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uint32_t freq;
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uint32_t rate;
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int gain;
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uint16_t buf16[MAXIMUM_BUF_LENGTH];
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uint32_t buf_len;
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int ppm_error;
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int offset_tuning;
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int direct_sampling;
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int mute;
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struct demod_state *demod_target;
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};
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struct demod_state
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{
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int exit_flag;
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pthread_t thread;
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int16_t lowpassed[MAXIMUM_BUF_LENGTH];
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int lp_len;
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int16_t lp_i_hist[10][6];
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int16_t lp_q_hist[10][6];
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int16_t result[MAXIMUM_BUF_LENGTH];
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int16_t droop_i_hist[9];
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int16_t droop_q_hist[9];
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int result_len;
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int rate_in;
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int rate_out;
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int rate_out2;
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int now_r, now_j;
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int pre_r, pre_j;
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int prev_index;
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int downsample; /* min 1, max 256 */
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int post_downsample;
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int output_scale;
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int squelch_level, conseq_squelch, squelch_hits, terminate_on_squelch;
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int downsample_passes;
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int comp_fir_size;
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int custom_atan;
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int deemph, deemph_a;
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int now_lpr;
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int prev_lpr_index;
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int dc_block, dc_avg;
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void (*mode_demod)(struct demod_state*);
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pthread_rwlock_t rw;
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pthread_cond_t ready;
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pthread_mutex_t ready_m;
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struct output_state *output_target;
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};
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struct output_state
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{
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int exit_flag;
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pthread_t thread;
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FILE *file;
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char *filename;
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int16_t result[MAXIMUM_BUF_LENGTH];
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int result_len;
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int rate;
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pthread_rwlock_t rw;
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pthread_cond_t ready;
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pthread_mutex_t ready_m;
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};
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struct controller_state
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{
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int exit_flag;
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pthread_t thread;
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uint32_t freqs[FREQUENCIES_LIMIT];
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int freq_len;
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int freq_now;
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int edge;
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int wb_mode;
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pthread_cond_t hop;
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pthread_mutex_t hop_m;
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};
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// multiple of these, eventually
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struct dongle_state dongle;
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struct demod_state demod;
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struct output_state output;
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struct controller_state controller;
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void usage(void)
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{
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fprintf(stderr,
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"rtl_fm, a simple narrow band FM demodulator for RTL2832 based DVB-T receivers\n\n"
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"Use:\trtl_fm -f freq [-options] [filename]\n"
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"\t-f frequency_to_tune_to [Hz]\n"
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"\t use multiple -f for scanning (requires squelch)\n"
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"\t ranges supported, -f 118M:137M:25k\n"
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"\t[-M modulation (default: fm)]\n"
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"\t fm, wbfm, raw, am, usb, lsb\n"
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"\t wbfm == -M fm -s 170k -o 4 -A fast -r 32k -l 0 -E deemp\n"
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"\t raw mode outputs 2x16 bit IQ pairs\n"
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"\t[-s sample_rate (default: 24k)]\n"
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"\t[-d device_index (default: 0)]\n"
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"\t[-T enable bias-T on GPIO PIN 0 (works for rtl-sdr.com v3 dongles)]\n"
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"\t[-g tuner_gain (default: automatic)]\n"
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"\t[-l squelch_level (default: 0/off)]\n"
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//"\t for fm squelch is inverted\n"
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//"\t[-o oversampling (default: 1, 4 recommended)]\n"
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"\t[-p ppm_error (default: 0)]\n"
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"\t[-E enable_option (default: none)]\n"
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"\t use multiple -E to enable multiple options\n"
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"\t edge: enable lower edge tuning\n"
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"\t dc: enable dc blocking filter\n"
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"\t deemp: enable de-emphasis filter\n"
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"\t direct: enable direct sampling\n"
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"\t offset: enable offset tuning\n"
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"\tfilename ('-' means stdout)\n"
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"\t omitting the filename also uses stdout\n\n"
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"Experimental options:\n"
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"\t[-r resample_rate (default: none / same as -s)]\n"
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"\t[-t squelch_delay (default: 10)]\n"
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"\t +values will mute/scan, -values will exit\n"
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"\t[-F fir_size (default: off)]\n"
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"\t enables low-leakage downsample filter\n"
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"\t size can be 0 or 9. 0 has bad roll off\n"
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"\t[-A std/fast/lut choose atan math (default: std)]\n"
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//"\t[-C clip_path (default: off)\n"
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//"\t (create time stamped raw clips, requires squelch)\n"
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//"\t (path must have '\%s' and will expand to date_time_freq)\n"
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//"\t[-H hop_fifo (default: off)\n"
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//"\t (fifo will contain the active frequency)\n"
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"\n"
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"Produces signed 16 bit ints, use Sox or aplay to hear them.\n"
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"\trtl_fm ... | play -t raw -r 24k -es -b 16 -c 1 -V1 -\n"
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"\t | aplay -r 24k -f S16_LE -t raw -c 1\n"
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"\t -M wbfm | play -r 32k ... \n"
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"\t -s 22050 | multimon -t raw /dev/stdin\n\n");
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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(dongle.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(dongle.dev);
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}
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#endif
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/* more cond dumbness */
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#define safe_cond_signal(n, m) pthread_mutex_lock(m); pthread_cond_signal(n); pthread_mutex_unlock(m)
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#define safe_cond_wait(n, m) pthread_mutex_lock(m); pthread_cond_wait(n, m); pthread_mutex_unlock(m)
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/* {length, coef, coef, coef} and scaled by 2^15
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for now, only length 9, optimal way to get +85% bandwidth */
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#define CIC_TABLE_MAX 10
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int cic_9_tables[][10] = {
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{0,},
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{9, -156, -97, 2798, -15489, 61019, -15489, 2798, -97, -156},
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{9, -128, -568, 5593, -24125, 74126, -24125, 5593, -568, -128},
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{9, -129, -639, 6187, -26281, 77511, -26281, 6187, -639, -129},
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{9, -122, -612, 6082, -26353, 77818, -26353, 6082, -612, -122},
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{9, -120, -602, 6015, -26269, 77757, -26269, 6015, -602, -120},
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{9, -120, -582, 5951, -26128, 77542, -26128, 5951, -582, -120},
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{9, -119, -580, 5931, -26094, 77505, -26094, 5931, -580, -119},
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{9, -119, -578, 5921, -26077, 77484, -26077, 5921, -578, -119},
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{9, -119, -577, 5917, -26067, 77473, -26067, 5917, -577, -119},
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{9, -199, -362, 5303, -25505, 77489, -25505, 5303, -362, -199},
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};
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#if defined(_MSC_VER) && (_MSC_VER < 1800)
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double log2(double n)
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{
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return log(n) / log(2.0);
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}
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#endif
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void rotate_90(unsigned char *buf, uint32_t len)
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/* 90 rotation is 1+0j, 0+1j, -1+0j, 0-1j
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or [0, 1, -3, 2, -4, -5, 7, -6] */
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{
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uint32_t i;
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unsigned char tmp;
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for (i=0; i<len; i+=8) {
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/* uint8_t negation = 255 - x */
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tmp = 255 - buf[i+3];
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buf[i+3] = buf[i+2];
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buf[i+2] = tmp;
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buf[i+4] = 255 - buf[i+4];
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buf[i+5] = 255 - buf[i+5];
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tmp = 255 - buf[i+6];
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buf[i+6] = buf[i+7];
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buf[i+7] = tmp;
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}
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}
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void low_pass(struct demod_state *d)
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/* simple square window FIR */
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{
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int i=0, i2=0;
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while (i < d->lp_len) {
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d->now_r += d->lowpassed[i];
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d->now_j += d->lowpassed[i+1];
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i += 2;
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d->prev_index++;
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if (d->prev_index < d->downsample) {
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continue;
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}
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d->lowpassed[i2] = d->now_r; // * d->output_scale;
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d->lowpassed[i2+1] = d->now_j; // * d->output_scale;
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d->prev_index = 0;
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d->now_r = 0;
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d->now_j = 0;
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i2 += 2;
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}
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d->lp_len = i2;
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}
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int low_pass_simple(int16_t *signal2, int len, int step)
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// no wrap around, length must be multiple of step
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{
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int i, i2, sum;
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for(i=0; i < len; i+=step) {
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sum = 0;
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for(i2=0; i2<step; i2++) {
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sum += (int)signal2[i + i2];
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}
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//signal2[i/step] = (int16_t)(sum / step);
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signal2[i/step] = (int16_t)(sum);
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}
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signal2[i/step + 1] = signal2[i/step];
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return len / step;
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}
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void low_pass_real(struct demod_state *s)
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/* simple square window FIR */
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// add support for upsampling?
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{
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int i=0, i2=0;
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int fast = (int)s->rate_out;
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int slow = s->rate_out2;
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while (i < s->result_len) {
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s->now_lpr += s->result[i];
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i++;
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s->prev_lpr_index += slow;
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if (s->prev_lpr_index < fast) {
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continue;
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}
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s->result[i2] = (int16_t)(s->now_lpr / (fast/slow));
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s->prev_lpr_index -= fast;
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s->now_lpr = 0;
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i2 += 1;
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}
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s->result_len = i2;
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}
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void fifth_order(int16_t *data, int length, int16_t *hist)
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/* for half of interleaved data */
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{
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int i;
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int16_t a, b, c, d, e, f;
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a = hist[1];
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b = hist[2];
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c = hist[3];
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d = hist[4];
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e = hist[5];
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f = data[0];
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/* a downsample should improve resolution, so don't fully shift */
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data[0] = (a + (b+e)*5 + (c+d)*10 + f) >> 4;
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for (i=4; i<length; i+=4) {
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a = c;
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b = d;
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c = e;
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d = f;
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e = data[i-2];
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f = data[i];
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data[i/2] = (a + (b+e)*5 + (c+d)*10 + f) >> 4;
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}
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/* archive */
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hist[0] = a;
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hist[1] = b;
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hist[2] = c;
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hist[3] = d;
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hist[4] = e;
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hist[5] = f;
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}
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void generic_fir(int16_t *data, int length, int *fir, int16_t *hist)
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/* Okay, not at all generic. Assumes length 9, fix that eventually. */
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{
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int d, temp, sum;
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for (d=0; d<length; d+=2) {
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temp = data[d];
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sum = 0;
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sum += (hist[0] + hist[8]) * fir[1];
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sum += (hist[1] + hist[7]) * fir[2];
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sum += (hist[2] + hist[6]) * fir[3];
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sum += (hist[3] + hist[5]) * fir[4];
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sum += hist[4] * fir[5];
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data[d] = sum >> 15 ;
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hist[0] = hist[1];
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hist[1] = hist[2];
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hist[2] = hist[3];
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hist[3] = hist[4];
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hist[4] = hist[5];
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hist[5] = hist[6];
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hist[6] = hist[7];
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hist[7] = hist[8];
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hist[8] = temp;
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}
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}
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/* define our own complex math ops
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because ARMv5 has no hardware float */
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void multiply(int ar, int aj, int br, int bj, int *cr, int *cj)
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{
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*cr = ar*br - aj*bj;
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*cj = aj*br + ar*bj;
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}
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int polar_discriminant(int ar, int aj, int br, int bj)
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{
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int cr, cj;
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double angle;
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multiply(ar, aj, br, -bj, &cr, &cj);
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angle = atan2((double)cj, (double)cr);
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return (int)(angle / 3.14159 * (1<<14));
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}
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int fast_atan2(int y, int x)
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/* pre scaled for int16 */
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{
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int yabs, angle;
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int pi4=(1<<12), pi34=3*(1<<12); // note pi = 1<<14
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if (x==0 && y==0) {
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return 0;
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}
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yabs = y;
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if (yabs < 0) {
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yabs = -yabs;
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}
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if (x >= 0) {
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angle = pi4 - pi4 * (x-yabs) / (x+yabs);
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} else {
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angle = pi34 - pi4 * (x+yabs) / (yabs-x);
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}
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if (y < 0) {
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return -angle;
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}
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return angle;
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}
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int polar_disc_fast(int ar, int aj, int br, int bj)
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{
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int cr, cj;
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multiply(ar, aj, br, -bj, &cr, &cj);
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return fast_atan2(cj, cr);
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}
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int atan_lut_init(void)
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{
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int i = 0;
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atan_lut = malloc(atan_lut_size * sizeof(int));
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for (i = 0; i < atan_lut_size; i++) {
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atan_lut[i] = (int) (atan((double) i / (1<<atan_lut_coef)) / 3.14159 * (1<<14));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int polar_disc_lut(int ar, int aj, int br, int bj)
|
|
{
|
|
int cr, cj, x, x_abs;
|
|
|
|
multiply(ar, aj, br, -bj, &cr, &cj);
|
|
|
|
/* special cases */
|
|
if (cr == 0 || cj == 0) {
|
|
if (cr == 0 && cj == 0)
|
|
{return 0;}
|
|
if (cr == 0 && cj > 0)
|
|
{return 1 << 13;}
|
|
if (cr == 0 && cj < 0)
|
|
{return -(1 << 13);}
|
|
if (cj == 0 && cr > 0)
|
|
{return 0;}
|
|
if (cj == 0 && cr < 0)
|
|
{return 1 << 14;}
|
|
}
|
|
|
|
/* real range -32768 - 32768 use 64x range -> absolute maximum: 2097152 */
|
|
x = (cj << atan_lut_coef) / cr;
|
|
x_abs = abs(x);
|
|
|
|
if (x_abs >= atan_lut_size) {
|
|
/* we can use linear range, but it is not necessary */
|
|
return (cj > 0) ? 1<<13 : -(1<<13);
|
|
}
|
|
|
|
if (x > 0) {
|
|
return (cj > 0) ? atan_lut[x] : atan_lut[x] - (1<<14);
|
|
} else {
|
|
return (cj > 0) ? (1<<14) - atan_lut[-x] : -atan_lut[-x];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void fm_demod(struct demod_state *fm)
|
|
{
|
|
int i, pcm;
|
|
int16_t *lp = fm->lowpassed;
|
|
pcm = polar_discriminant(lp[0], lp[1],
|
|
fm->pre_r, fm->pre_j);
|
|
fm->result[0] = (int16_t)pcm;
|
|
for (i = 2; i < (fm->lp_len-1); i += 2) {
|
|
switch (fm->custom_atan) {
|
|
case 0:
|
|
pcm = polar_discriminant(lp[i], lp[i+1],
|
|
lp[i-2], lp[i-1]);
|
|
break;
|
|
case 1:
|
|
pcm = polar_disc_fast(lp[i], lp[i+1],
|
|
lp[i-2], lp[i-1]);
|
|
break;
|
|
case 2:
|
|
pcm = polar_disc_lut(lp[i], lp[i+1],
|
|
lp[i-2], lp[i-1]);
|
|
break;
|
|
}
|
|
fm->result[i/2] = (int16_t)pcm;
|
|
}
|
|
fm->pre_r = lp[fm->lp_len - 2];
|
|
fm->pre_j = lp[fm->lp_len - 1];
|
|
fm->result_len = fm->lp_len/2;
|
|
}
|
|
|
|
void am_demod(struct demod_state *fm)
|
|
// todo, fix this extreme laziness
|
|
{
|
|
int i, pcm;
|
|
int16_t *lp = fm->lowpassed;
|
|
int16_t *r = fm->result;
|
|
for (i = 0; i < fm->lp_len; i += 2) {
|
|
// hypot uses floats but won't overflow
|
|
//r[i/2] = (int16_t)hypot(lp[i], lp[i+1]);
|
|
pcm = lp[i] * lp[i];
|
|
pcm += lp[i+1] * lp[i+1];
|
|
r[i/2] = (int16_t)sqrt(pcm) * fm->output_scale;
|
|
}
|
|
fm->result_len = fm->lp_len/2;
|
|
// lowpass? (3khz) highpass? (dc)
|
|
}
|
|
|
|
void usb_demod(struct demod_state *fm)
|
|
{
|
|
int i, pcm;
|
|
int16_t *lp = fm->lowpassed;
|
|
int16_t *r = fm->result;
|
|
for (i = 0; i < fm->lp_len; i += 2) {
|
|
pcm = lp[i] + lp[i+1];
|
|
r[i/2] = (int16_t)pcm * fm->output_scale;
|
|
}
|
|
fm->result_len = fm->lp_len/2;
|
|
}
|
|
|
|
void lsb_demod(struct demod_state *fm)
|
|
{
|
|
int i, pcm;
|
|
int16_t *lp = fm->lowpassed;
|
|
int16_t *r = fm->result;
|
|
for (i = 0; i < fm->lp_len; i += 2) {
|
|
pcm = lp[i] - lp[i+1];
|
|
r[i/2] = (int16_t)pcm * fm->output_scale;
|
|
}
|
|
fm->result_len = fm->lp_len/2;
|
|
}
|
|
|
|
void raw_demod(struct demod_state *fm)
|
|
{
|
|
int i;
|
|
for (i = 0; i < fm->lp_len; i++) {
|
|
fm->result[i] = (int16_t)fm->lowpassed[i];
|
|
}
|
|
fm->result_len = fm->lp_len;
|
|
}
|
|
|
|
void deemph_filter(struct demod_state *fm)
|
|
{
|
|
static int avg; // cheating...
|
|
int i, d;
|
|
// de-emph IIR
|
|
// avg = avg * (1 - alpha) + sample * alpha;
|
|
for (i = 0; i < fm->result_len; i++) {
|
|
d = fm->result[i] - avg;
|
|
if (d > 0) {
|
|
avg += (d + fm->deemph_a/2) / fm->deemph_a;
|
|
} else {
|
|
avg += (d - fm->deemph_a/2) / fm->deemph_a;
|
|
}
|
|
fm->result[i] = (int16_t)avg;
|
|
}
|
|
}
|
|
|
|
void dc_block_filter(struct demod_state *fm)
|
|
{
|
|
int i, avg;
|
|
int64_t sum = 0;
|
|
for (i=0; i < fm->result_len; i++) {
|
|
sum += fm->result[i];
|
|
}
|
|
avg = sum / fm->result_len;
|
|
avg = (avg + fm->dc_avg * 9) / 10;
|
|
for (i=0; i < fm->result_len; i++) {
|
|
fm->result[i] -= avg;
|
|
}
|
|
fm->dc_avg = avg;
|
|
}
|
|
|
|
int mad(int16_t *samples, int len, int step)
|
|
/* mean average deviation */
|
|
{
|
|
int i=0, sum=0, ave=0;
|
|
if (len == 0)
|
|
{return 0;}
|
|
for (i=0; i<len; i+=step) {
|
|
sum += samples[i];
|
|
}
|
|
ave = sum / (len * step);
|
|
sum = 0;
|
|
for (i=0; i<len; i+=step) {
|
|
sum += abs(samples[i] - ave);
|
|
}
|
|
return sum / (len / step);
|
|
}
|
|
|
|
int rms(int16_t *samples, int len, int step)
|
|
/* largely lifted from rtl_power */
|
|
{
|
|
int i;
|
|
long p, t, s;
|
|
double dc, err;
|
|
|
|
p = t = 0L;
|
|
for (i=0; i<len; i+=step) {
|
|
s = (long)samples[i];
|
|
t += s;
|
|
p += s * s;
|
|
}
|
|
/* correct for dc offset in squares */
|
|
dc = (double)(t*step) / (double)len;
|
|
err = t * 2 * dc - dc * dc * len;
|
|
|
|
return (int)sqrt((p-err) / len);
|
|
}
|
|
|
|
void arbitrary_upsample(int16_t *buf1, int16_t *buf2, int len1, int len2)
|
|
/* linear interpolation, len1 < len2 */
|
|
{
|
|
int i = 1;
|
|
int j = 0;
|
|
int tick = 0;
|
|
double frac; // use integers...
|
|
while (j < len2) {
|
|
frac = (double)tick / (double)len2;
|
|
buf2[j] = (int16_t)(buf1[i-1]*(1-frac) + buf1[i]*frac);
|
|
j++;
|
|
tick += len1;
|
|
if (tick > len2) {
|
|
tick -= len2;
|
|
i++;
|
|
}
|
|
if (i >= len1) {
|
|
i = len1 - 1;
|
|
tick = len2;
|
|
}
|
|
}
|
|
}
|
|
|
|
void arbitrary_downsample(int16_t *buf1, int16_t *buf2, int len1, int len2)
|
|
/* fractional boxcar lowpass, len1 > len2 */
|
|
{
|
|
int i = 1;
|
|
int j = 0;
|
|
int tick = 0;
|
|
double remainder = 0;
|
|
double frac; // use integers...
|
|
buf2[0] = 0;
|
|
while (j < len2) {
|
|
frac = 1.0;
|
|
if ((tick + len2) > len1) {
|
|
frac = (double)(len1 - tick) / (double)len2;}
|
|
buf2[j] += (int16_t)((double)buf1[i] * frac + remainder);
|
|
remainder = (double)buf1[i] * (1.0-frac);
|
|
tick += len2;
|
|
i++;
|
|
if (tick > len1) {
|
|
j++;
|
|
buf2[j] = 0;
|
|
tick -= len1;
|
|
}
|
|
if (i >= len1) {
|
|
i = len1 - 1;
|
|
tick = len1;
|
|
}
|
|
}
|
|
for (j=0; j<len2; j++) {
|
|
buf2[j] = buf2[j] * len2 / len1;}
|
|
}
|
|
|
|
void arbitrary_resample(int16_t *buf1, int16_t *buf2, int len1, int len2)
|
|
/* up to you to calculate lengths and make sure it does not go OOB
|
|
* okay for buffers to overlap, if you are downsampling */
|
|
{
|
|
if (len1 < len2) {
|
|
arbitrary_upsample(buf1, buf2, len1, len2);
|
|
} else {
|
|
arbitrary_downsample(buf1, buf2, len1, len2);
|
|
}
|
|
}
|
|
|
|
void full_demod(struct demod_state *d)
|
|
{
|
|
int i, ds_p;
|
|
int sr = 0;
|
|
ds_p = d->downsample_passes;
|
|
if (ds_p) {
|
|
for (i=0; i < ds_p; i++) {
|
|
fifth_order(d->lowpassed, (d->lp_len >> i), d->lp_i_hist[i]);
|
|
fifth_order(d->lowpassed+1, (d->lp_len >> i) - 1, d->lp_q_hist[i]);
|
|
}
|
|
d->lp_len = d->lp_len >> ds_p;
|
|
/* droop compensation */
|
|
if (d->comp_fir_size == 9 && ds_p <= CIC_TABLE_MAX) {
|
|
generic_fir(d->lowpassed, d->lp_len,
|
|
cic_9_tables[ds_p], d->droop_i_hist);
|
|
generic_fir(d->lowpassed+1, d->lp_len-1,
|
|
cic_9_tables[ds_p], d->droop_q_hist);
|
|
}
|
|
} else {
|
|
low_pass(d);
|
|
}
|
|
/* power squelch */
|
|
if (d->squelch_level) {
|
|
sr = rms(d->lowpassed, d->lp_len, 1);
|
|
if (sr < d->squelch_level) {
|
|
d->squelch_hits++;
|
|
for (i=0; i<d->lp_len; i++) {
|
|
d->lowpassed[i] = 0;
|
|
}
|
|
} else {
|
|
d->squelch_hits = 0;}
|
|
}
|
|
d->mode_demod(d); /* lowpassed -> result */
|
|
if (d->mode_demod == &raw_demod) {
|
|
return;
|
|
}
|
|
/* todo, fm noise squelch */
|
|
// use nicer filter here too?
|
|
if (d->post_downsample > 1) {
|
|
d->result_len = low_pass_simple(d->result, d->result_len, d->post_downsample);}
|
|
if (d->deemph) {
|
|
deemph_filter(d);}
|
|
if (d->dc_block) {
|
|
dc_block_filter(d);}
|
|
if (d->rate_out2 > 0) {
|
|
low_pass_real(d);
|
|
//arbitrary_resample(d->result, d->result, d->result_len, d->result_len * d->rate_out2 / d->rate_out);
|
|
}
|
|
}
|
|
|
|
static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
|
|
{
|
|
int i;
|
|
struct dongle_state *s = ctx;
|
|
struct demod_state *d = s->demod_target;
|
|
|
|
if (do_exit) {
|
|
return;}
|
|
if (!ctx) {
|
|
return;}
|
|
if (s->mute) {
|
|
for (i=0; i<s->mute; i++) {
|
|
buf[i] = 127;}
|
|
s->mute = 0;
|
|
}
|
|
if (!s->offset_tuning) {
|
|
rotate_90(buf, len);}
|
|
for (i=0; i<(int)len; i++) {
|
|
s->buf16[i] = (int16_t)buf[i] - 127;}
|
|
pthread_rwlock_wrlock(&d->rw);
|
|
memcpy(d->lowpassed, s->buf16, 2*len);
|
|
d->lp_len = len;
|
|
pthread_rwlock_unlock(&d->rw);
|
|
safe_cond_signal(&d->ready, &d->ready_m);
|
|
}
|
|
|
|
static void *dongle_thread_fn(void *arg)
|
|
{
|
|
struct dongle_state *s = arg;
|
|
rtlsdr_read_async(s->dev, rtlsdr_callback, s, 0, s->buf_len);
|
|
return 0;
|
|
}
|
|
|
|
static void *demod_thread_fn(void *arg)
|
|
{
|
|
struct demod_state *d = arg;
|
|
struct output_state *o = d->output_target;
|
|
while (!do_exit) {
|
|
safe_cond_wait(&d->ready, &d->ready_m);
|
|
pthread_rwlock_wrlock(&d->rw);
|
|
full_demod(d);
|
|
pthread_rwlock_unlock(&d->rw);
|
|
if (d->exit_flag) {
|
|
do_exit = 1;
|
|
}
|
|
if (d->squelch_level && d->squelch_hits > d->conseq_squelch) {
|
|
d->squelch_hits = d->conseq_squelch + 1; /* hair trigger */
|
|
safe_cond_signal(&controller.hop, &controller.hop_m);
|
|
continue;
|
|
}
|
|
pthread_rwlock_wrlock(&o->rw);
|
|
memcpy(o->result, d->result, 2*d->result_len);
|
|
o->result_len = d->result_len;
|
|
pthread_rwlock_unlock(&o->rw);
|
|
safe_cond_signal(&o->ready, &o->ready_m);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void *output_thread_fn(void *arg)
|
|
{
|
|
struct output_state *s = arg;
|
|
while (!do_exit) {
|
|
// use timedwait and pad out under runs
|
|
safe_cond_wait(&s->ready, &s->ready_m);
|
|
pthread_rwlock_rdlock(&s->rw);
|
|
fwrite(s->result, 2, s->result_len, s->file);
|
|
pthread_rwlock_unlock(&s->rw);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void optimal_settings(int freq, int rate)
|
|
{
|
|
// giant ball of hacks
|
|
// seems unable to do a single pass, 2:1
|
|
int capture_freq, capture_rate;
|
|
struct dongle_state *d = &dongle;
|
|
struct demod_state *dm = &demod;
|
|
struct controller_state *cs = &controller;
|
|
dm->downsample = (1000000 / dm->rate_in) + 1;
|
|
if (dm->downsample_passes) {
|
|
dm->downsample_passes = (int)log2(dm->downsample) + 1;
|
|
dm->downsample = 1 << dm->downsample_passes;
|
|
}
|
|
capture_freq = freq;
|
|
capture_rate = dm->downsample * dm->rate_in;
|
|
if (!d->offset_tuning) {
|
|
capture_freq = freq + capture_rate/4;}
|
|
capture_freq += cs->edge * dm->rate_in / 2;
|
|
dm->output_scale = (1<<15) / (128 * dm->downsample);
|
|
if (dm->output_scale < 1) {
|
|
dm->output_scale = 1;}
|
|
if (dm->mode_demod == &fm_demod) {
|
|
dm->output_scale = 1;}
|
|
d->freq = (uint32_t)capture_freq;
|
|
d->rate = (uint32_t)capture_rate;
|
|
}
|
|
|
|
static void *controller_thread_fn(void *arg)
|
|
{
|
|
// thoughts for multiple dongles
|
|
// might be no good using a controller thread if retune/rate blocks
|
|
int i;
|
|
struct controller_state *s = arg;
|
|
|
|
if (s->wb_mode) {
|
|
for (i=0; i < s->freq_len; i++) {
|
|
s->freqs[i] += 16000;}
|
|
}
|
|
|
|
/* set up primary channel */
|
|
optimal_settings(s->freqs[0], demod.rate_in);
|
|
if (dongle.direct_sampling) {
|
|
verbose_direct_sampling(dongle.dev, 1);}
|
|
if (dongle.offset_tuning) {
|
|
verbose_offset_tuning(dongle.dev);}
|
|
|
|
/* Set the frequency */
|
|
verbose_set_frequency(dongle.dev, dongle.freq);
|
|
fprintf(stderr, "Oversampling input by: %ix.\n", demod.downsample);
|
|
fprintf(stderr, "Oversampling output by: %ix.\n", demod.post_downsample);
|
|
fprintf(stderr, "Buffer size: %0.2fms\n",
|
|
1000 * 0.5 * (float)ACTUAL_BUF_LENGTH / (float)dongle.rate);
|
|
|
|
/* Set the sample rate */
|
|
verbose_set_sample_rate(dongle.dev, dongle.rate);
|
|
fprintf(stderr, "Output at %u Hz.\n", demod.rate_in/demod.post_downsample);
|
|
|
|
while (!do_exit) {
|
|
safe_cond_wait(&s->hop, &s->hop_m);
|
|
if (s->freq_len <= 1) {
|
|
continue;}
|
|
/* hacky hopping */
|
|
s->freq_now = (s->freq_now + 1) % s->freq_len;
|
|
optimal_settings(s->freqs[s->freq_now], demod.rate_in);
|
|
rtlsdr_set_center_freq(dongle.dev, dongle.freq);
|
|
dongle.mute = BUFFER_DUMP;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void frequency_range(struct controller_state *s, char *arg)
|
|
{
|
|
char *start, *stop, *step;
|
|
int i;
|
|
start = arg;
|
|
stop = strchr(start, ':') + 1;
|
|
if (stop == (char *)1) { // no stop or step given
|
|
s->freqs[s->freq_len] = (uint32_t) atofs(start);
|
|
s->freq_len++;
|
|
return;
|
|
}
|
|
stop[-1] = '\0';
|
|
step = strchr(stop, ':') + 1;
|
|
if (step == (char *)1) { // no step given
|
|
s->freqs[s->freq_len] = (uint32_t) atofs(start);
|
|
s->freq_len++;
|
|
s->freqs[s->freq_len] = (uint32_t) atofs(stop);
|
|
s->freq_len++;
|
|
stop[-1] = ':';
|
|
return;
|
|
}
|
|
step[-1] = '\0';
|
|
for(i=(int)atofs(start); i<=(int)atofs(stop); i+=(int)atofs(step))
|
|
{
|
|
s->freqs[s->freq_len] = (uint32_t)i;
|
|
s->freq_len++;
|
|
if (s->freq_len >= FREQUENCIES_LIMIT) {
|
|
break;}
|
|
}
|
|
stop[-1] = ':';
|
|
step[-1] = ':';
|
|
}
|
|
|
|
void dongle_init(struct dongle_state *s)
|
|
{
|
|
s->rate = DEFAULT_SAMPLE_RATE;
|
|
s->gain = AUTO_GAIN; // tenths of a dB
|
|
s->mute = 0;
|
|
s->direct_sampling = 0;
|
|
s->offset_tuning = 0;
|
|
s->demod_target = &demod;
|
|
}
|
|
|
|
void demod_init(struct demod_state *s)
|
|
{
|
|
s->rate_in = DEFAULT_SAMPLE_RATE;
|
|
s->rate_out = DEFAULT_SAMPLE_RATE;
|
|
s->squelch_level = 0;
|
|
s->conseq_squelch = 10;
|
|
s->terminate_on_squelch = 0;
|
|
s->squelch_hits = 11;
|
|
s->downsample_passes = 0;
|
|
s->comp_fir_size = 0;
|
|
s->prev_index = 0;
|
|
s->post_downsample = 1; // once this works, default = 4
|
|
s->custom_atan = 0;
|
|
s->deemph = 0;
|
|
s->rate_out2 = -1; // flag for disabled
|
|
s->mode_demod = &fm_demod;
|
|
s->pre_j = s->pre_r = s->now_r = s->now_j = 0;
|
|
s->prev_lpr_index = 0;
|
|
s->deemph_a = 0;
|
|
s->now_lpr = 0;
|
|
s->dc_block = 0;
|
|
s->dc_avg = 0;
|
|
pthread_rwlock_init(&s->rw, NULL);
|
|
pthread_cond_init(&s->ready, NULL);
|
|
pthread_mutex_init(&s->ready_m, NULL);
|
|
s->output_target = &output;
|
|
}
|
|
|
|
void demod_cleanup(struct demod_state *s)
|
|
{
|
|
pthread_rwlock_destroy(&s->rw);
|
|
pthread_cond_destroy(&s->ready);
|
|
pthread_mutex_destroy(&s->ready_m);
|
|
}
|
|
|
|
void output_init(struct output_state *s)
|
|
{
|
|
s->rate = DEFAULT_SAMPLE_RATE;
|
|
pthread_rwlock_init(&s->rw, NULL);
|
|
pthread_cond_init(&s->ready, NULL);
|
|
pthread_mutex_init(&s->ready_m, NULL);
|
|
}
|
|
|
|
void output_cleanup(struct output_state *s)
|
|
{
|
|
pthread_rwlock_destroy(&s->rw);
|
|
pthread_cond_destroy(&s->ready);
|
|
pthread_mutex_destroy(&s->ready_m);
|
|
}
|
|
|
|
void controller_init(struct controller_state *s)
|
|
{
|
|
s->freqs[0] = 100000000;
|
|
s->freq_len = 0;
|
|
s->edge = 0;
|
|
s->wb_mode = 0;
|
|
pthread_cond_init(&s->hop, NULL);
|
|
pthread_mutex_init(&s->hop_m, NULL);
|
|
}
|
|
|
|
void controller_cleanup(struct controller_state *s)
|
|
{
|
|
pthread_cond_destroy(&s->hop);
|
|
pthread_mutex_destroy(&s->hop_m);
|
|
}
|
|
|
|
void sanity_checks(void)
|
|
{
|
|
if (controller.freq_len == 0) {
|
|
fprintf(stderr, "Please specify a frequency.\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (controller.freq_len >= FREQUENCIES_LIMIT) {
|
|
fprintf(stderr, "Too many channels, maximum %i.\n", FREQUENCIES_LIMIT);
|
|
exit(1);
|
|
}
|
|
|
|
if (controller.freq_len > 1 && demod.squelch_level == 0) {
|
|
fprintf(stderr, "Please specify a squelch level. Required for scanning multiple frequencies.\n");
|
|
exit(1);
|
|
}
|
|
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
#ifndef _WIN32
|
|
struct sigaction sigact;
|
|
#endif
|
|
int r, opt;
|
|
int dev_given = 0;
|
|
int custom_ppm = 0;
|
|
int enable_biastee = 0;
|
|
dongle_init(&dongle);
|
|
demod_init(&demod);
|
|
output_init(&output);
|
|
controller_init(&controller);
|
|
|
|
while ((opt = getopt(argc, argv, "d:f:g:s:b:l:o:t:r:p:E:F:A:M:hT")) != -1) {
|
|
switch (opt) {
|
|
case 'd':
|
|
dongle.dev_index = verbose_device_search(optarg);
|
|
dev_given = 1;
|
|
break;
|
|
case 'f':
|
|
if (controller.freq_len >= FREQUENCIES_LIMIT) {
|
|
break;}
|
|
if (strchr(optarg, ':'))
|
|
{frequency_range(&controller, optarg);}
|
|
else
|
|
{
|
|
controller.freqs[controller.freq_len] = (uint32_t)atofs(optarg);
|
|
controller.freq_len++;
|
|
}
|
|
break;
|
|
case 'g':
|
|
dongle.gain = (int)(atof(optarg) * 10);
|
|
break;
|
|
case 'l':
|
|
demod.squelch_level = (int)atof(optarg);
|
|
break;
|
|
case 's':
|
|
demod.rate_in = (uint32_t)atofs(optarg);
|
|
demod.rate_out = (uint32_t)atofs(optarg);
|
|
break;
|
|
case 'r':
|
|
output.rate = (int)atofs(optarg);
|
|
demod.rate_out2 = (int)atofs(optarg);
|
|
break;
|
|
case 'o':
|
|
fprintf(stderr, "Warning: -o is very buggy\n");
|
|
demod.post_downsample = (int)atof(optarg);
|
|
if (demod.post_downsample < 1 || demod.post_downsample > MAXIMUM_OVERSAMPLE) {
|
|
fprintf(stderr, "Oversample must be between 1 and %i\n", MAXIMUM_OVERSAMPLE);}
|
|
break;
|
|
case 't':
|
|
demod.conseq_squelch = (int)atof(optarg);
|
|
if (demod.conseq_squelch < 0) {
|
|
demod.conseq_squelch = -demod.conseq_squelch;
|
|
demod.terminate_on_squelch = 1;
|
|
}
|
|
break;
|
|
case 'p':
|
|
dongle.ppm_error = atoi(optarg);
|
|
custom_ppm = 1;
|
|
break;
|
|
case 'E':
|
|
if (strcmp("edge", optarg) == 0) {
|
|
controller.edge = 1;}
|
|
if (strcmp("dc", optarg) == 0) {
|
|
demod.dc_block = 1;}
|
|
if (strcmp("deemp", optarg) == 0) {
|
|
demod.deemph = 1;}
|
|
if (strcmp("direct", optarg) == 0) {
|
|
dongle.direct_sampling = 1;}
|
|
if (strcmp("offset", optarg) == 0) {
|
|
dongle.offset_tuning = 1;}
|
|
break;
|
|
case 'F':
|
|
demod.downsample_passes = 1; /* truthy placeholder */
|
|
demod.comp_fir_size = atoi(optarg);
|
|
break;
|
|
case 'A':
|
|
if (strcmp("std", optarg) == 0) {
|
|
demod.custom_atan = 0;}
|
|
if (strcmp("fast", optarg) == 0) {
|
|
demod.custom_atan = 1;}
|
|
if (strcmp("lut", optarg) == 0) {
|
|
atan_lut_init();
|
|
demod.custom_atan = 2;}
|
|
break;
|
|
case 'M':
|
|
if (strcmp("fm", optarg) == 0) {
|
|
demod.mode_demod = &fm_demod;}
|
|
if (strcmp("raw", optarg) == 0) {
|
|
demod.mode_demod = &raw_demod;}
|
|
if (strcmp("am", optarg) == 0) {
|
|
demod.mode_demod = &am_demod;}
|
|
if (strcmp("usb", optarg) == 0) {
|
|
demod.mode_demod = &usb_demod;}
|
|
if (strcmp("lsb", optarg) == 0) {
|
|
demod.mode_demod = &lsb_demod;}
|
|
if (strcmp("wbfm", optarg) == 0) {
|
|
controller.wb_mode = 1;
|
|
demod.mode_demod = &fm_demod;
|
|
demod.rate_in = 170000;
|
|
demod.rate_out = 170000;
|
|
demod.rate_out2 = 32000;
|
|
demod.custom_atan = 1;
|
|
//demod.post_downsample = 4;
|
|
demod.deemph = 1;
|
|
demod.squelch_level = 0;}
|
|
break;
|
|
case 'T':
|
|
enable_biastee = 1;
|
|
break;
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* quadruple sample_rate to limit to Δθ to ±π/2 */
|
|
demod.rate_in *= demod.post_downsample;
|
|
|
|
if (!output.rate) {
|
|
output.rate = demod.rate_out;}
|
|
|
|
sanity_checks();
|
|
|
|
if (controller.freq_len > 1) {
|
|
demod.terminate_on_squelch = 0;}
|
|
|
|
if (argc <= optind) {
|
|
output.filename = "-";
|
|
} else {
|
|
output.filename = argv[optind];
|
|
}
|
|
|
|
ACTUAL_BUF_LENGTH = lcm_post[demod.post_downsample] * DEFAULT_BUF_LENGTH;
|
|
|
|
if (!dev_given) {
|
|
dongle.dev_index = verbose_device_search("0");
|
|
}
|
|
|
|
if (dongle.dev_index < 0) {
|
|
exit(1);
|
|
}
|
|
|
|
r = rtlsdr_open(&dongle.dev, (uint32_t)dongle.dev_index);
|
|
if (r < 0) {
|
|
fprintf(stderr, "Failed to open rtlsdr device #%d.\n", dongle.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
|
|
|
|
if (demod.deemph) {
|
|
demod.deemph_a = (int)round(1.0/((1.0-exp(-1.0/(demod.rate_out * 75e-6)))));
|
|
}
|
|
|
|
/* Set the tuner gain */
|
|
if (dongle.gain == AUTO_GAIN) {
|
|
verbose_auto_gain(dongle.dev);
|
|
} else {
|
|
dongle.gain = nearest_gain(dongle.dev, dongle.gain);
|
|
verbose_gain_set(dongle.dev, dongle.gain);
|
|
}
|
|
|
|
rtlsdr_set_bias_tee(dongle.dev, enable_biastee);
|
|
if (enable_biastee)
|
|
fprintf(stderr, "activated bias-T on GPIO PIN 0\n");
|
|
|
|
verbose_ppm_set(dongle.dev, dongle.ppm_error);
|
|
|
|
if (strcmp(output.filename, "-") == 0) { /* Write samples to stdout */
|
|
output.file = stdout;
|
|
#ifdef _WIN32
|
|
_setmode(_fileno(output.file), _O_BINARY);
|
|
#endif
|
|
} else {
|
|
output.file = fopen(output.filename, "wb");
|
|
if (!output.file) {
|
|
fprintf(stderr, "Failed to open %s\n", output.filename);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
//r = rtlsdr_set_testmode(dongle.dev, 1);
|
|
|
|
/* Reset endpoint before we start reading from it (mandatory) */
|
|
verbose_reset_buffer(dongle.dev);
|
|
|
|
pthread_create(&controller.thread, NULL, controller_thread_fn, (void *)(&controller));
|
|
usleep(100000);
|
|
pthread_create(&output.thread, NULL, output_thread_fn, (void *)(&output));
|
|
pthread_create(&demod.thread, NULL, demod_thread_fn, (void *)(&demod));
|
|
pthread_create(&dongle.thread, NULL, dongle_thread_fn, (void *)(&dongle));
|
|
|
|
while (!do_exit) {
|
|
usleep(100000);
|
|
}
|
|
|
|
if (do_exit) {
|
|
fprintf(stderr, "\nUser cancel, exiting...\n");}
|
|
else {
|
|
fprintf(stderr, "\nLibrary error %d, exiting...\n", r);}
|
|
|
|
rtlsdr_cancel_async(dongle.dev);
|
|
pthread_join(dongle.thread, NULL);
|
|
safe_cond_signal(&demod.ready, &demod.ready_m);
|
|
pthread_join(demod.thread, NULL);
|
|
safe_cond_signal(&output.ready, &output.ready_m);
|
|
pthread_join(output.thread, NULL);
|
|
safe_cond_signal(&controller.hop, &controller.hop_m);
|
|
pthread_join(controller.thread, NULL);
|
|
|
|
//dongle_cleanup(&dongle);
|
|
demod_cleanup(&demod);
|
|
output_cleanup(&output);
|
|
controller_cleanup(&controller);
|
|
|
|
if (output.file != stdout) {
|
|
fclose(output.file);}
|
|
|
|
rtlsdr_close(dongle.dev);
|
|
return r >= 0 ? r : -r;
|
|
}
|
|
|
|
// vim: tabstop=8:softtabstop=8:shiftwidth=8:noexpandtab
|