From 37b99c704d77c60fa808fd393d17045d1d6cf32e Mon Sep 17 00:00:00 2001 From: dinashi Date: Sun, 13 Mar 2022 11:41:55 +0000 Subject: Add all changes and READMe --- utils/rtl_fm.c | 1289 -------------------------------------------------------- 1 file changed, 1289 deletions(-) delete mode 100644 utils/rtl_fm.c (limited to 'utils/rtl_fm.c') diff --git a/utils/rtl_fm.c b/utils/rtl_fm.c deleted file mode 100644 index 7c84332..0000000 --- a/utils/rtl_fm.c +++ /dev/null @@ -1,1289 +0,0 @@ -/* - * rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver - * Copyright (C) 2012 by Steve Markgraf - * Copyright (C) 2012 by Hoernchen - * Copyright (C) 2012 by Kyle Keen - * Copyright (C) 2013 by Elias Oenal - * - * 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 . - */ - - -/* - * written because people could not do real time - * FM demod on Atom hardware with GNU radio - * based on rtl_sdr.c and rtl_tcp.c - * - * lots of locks, but that is okay - * (no many-to-many locks) - * - * todo: - * sanity checks - * scale squelch to other input parameters - * test all the demodulations - * pad output on hop - * frequency ranges could be stored better - * scaled AM demod amplification - * auto-hop after time limit - * peak detector to tune onto stronger signals - * fifo for active hop frequency - * clips - * noise squelch - * merge stereo patch - * merge soft agc patch - * merge udp patch - * testmode to detect overruns - * watchdog to reset bad dongle - * fix oversampling - */ - -#include -#include -#include -#include -#include - -#ifndef _WIN32 -#include -#else -#include -#include -#include -#include "getopt/getopt.h" -#define usleep(x) Sleep(x/1000) -#if defined(_MSC_VER) && (_MSC_VER < 1800) -#define round(x) (x > 0.0 ? floor(x + 0.5): ceil(x - 0.5)) -#endif -#define _USE_MATH_DEFINES -#endif - -#include -#include -#include - -#include "rtl-sdr.h" -#include "convenience/convenience.h" - -#define DEFAULT_SAMPLE_RATE 24000 -#define DEFAULT_BUF_LENGTH (1 * 16384) -#define MAXIMUM_OVERSAMPLE 16 -#define MAXIMUM_BUF_LENGTH (MAXIMUM_OVERSAMPLE * DEFAULT_BUF_LENGTH) -#define AUTO_GAIN -100 -#define BUFFER_DUMP 4096 - -#define FREQUENCIES_LIMIT 1000 - -static volatile int do_exit = 0; -static int lcm_post[17] = {1,1,1,3,1,5,3,7,1,9,5,11,3,13,7,15,1}; -static int ACTUAL_BUF_LENGTH; - -static int *atan_lut = NULL; -static int atan_lut_size = 131072; /* 512 KB */ -static int atan_lut_coef = 8; - -struct dongle_state -{ - int exit_flag; - pthread_t thread; - rtlsdr_dev_t *dev; - int dev_index; - uint32_t freq; - uint32_t rate; - int gain; - uint16_t buf16[MAXIMUM_BUF_LENGTH]; - uint32_t buf_len; - int ppm_error; - int offset_tuning; - int direct_sampling; - int mute; - struct demod_state *demod_target; -}; - -struct demod_state -{ - int exit_flag; - pthread_t thread; - int16_t lowpassed[MAXIMUM_BUF_LENGTH]; - int lp_len; - int16_t lp_i_hist[10][6]; - int16_t lp_q_hist[10][6]; - int16_t result[MAXIMUM_BUF_LENGTH]; - int16_t droop_i_hist[9]; - int16_t droop_q_hist[9]; - int result_len; - int rate_in; - int rate_out; - int rate_out2; - int now_r, now_j; - int pre_r, pre_j; - int prev_index; - int downsample; /* min 1, max 256 */ - int post_downsample; - int output_scale; - int squelch_level, conseq_squelch, squelch_hits, terminate_on_squelch; - int downsample_passes; - int comp_fir_size; - int custom_atan; - int deemph, deemph_a; - int now_lpr; - int prev_lpr_index; - int dc_block, dc_avg; - void (*mode_demod)(struct demod_state*); - pthread_rwlock_t rw; - pthread_cond_t ready; - pthread_mutex_t ready_m; - struct output_state *output_target; -}; - -struct output_state -{ - int exit_flag; - pthread_t thread; - FILE *file; - char *filename; - int16_t result[MAXIMUM_BUF_LENGTH]; - int result_len; - int rate; - pthread_rwlock_t rw; - pthread_cond_t ready; - pthread_mutex_t ready_m; -}; - -struct controller_state -{ - int exit_flag; - pthread_t thread; - uint32_t freqs[FREQUENCIES_LIMIT]; - int freq_len; - int freq_now; - int edge; - int wb_mode; - pthread_cond_t hop; - pthread_mutex_t hop_m; -}; - -// multiple of these, eventually -struct dongle_state dongle; -struct demod_state demod; -struct output_state output; -struct controller_state controller; - -void usage(void) -{ - fprintf(stderr, - "rtl_fm, a simple narrow band FM demodulator for RTL2832 based DVB-T receivers\n\n" - "Use:\trtl_fm -f freq [-options] [filename]\n" - "\t-f frequency_to_tune_to [Hz]\n" - "\t use multiple -f for scanning (requires squelch)\n" - "\t ranges supported, -f 118M:137M:25k\n" - "\t[-M modulation (default: fm)]\n" - "\t fm, wbfm, raw, am, usb, lsb\n" - "\t wbfm == -M fm -s 170k -o 4 -A fast -r 32k -l 0 -E deemp\n" - "\t raw mode outputs 2x16 bit IQ pairs\n" - "\t[-s sample_rate (default: 24k)]\n" - "\t[-d device_index (default: 0)]\n" - "\t[-T enable bias-T on GPIO PIN 0 (works for rtl-sdr.com v3 dongles)]\n" - "\t[-g tuner_gain (default: automatic)]\n" - "\t[-l squelch_level (default: 0/off)]\n" - //"\t for fm squelch is inverted\n" - //"\t[-o oversampling (default: 1, 4 recommended)]\n" - "\t[-p ppm_error (default: 0)]\n" - "\t[-E enable_option (default: none)]\n" - "\t use multiple -E to enable multiple options\n" - "\t edge: enable lower edge tuning\n" - "\t dc: enable dc blocking filter\n" - "\t deemp: enable de-emphasis filter\n" - "\t direct: enable direct sampling 1 (usually I)\n" - "\t direct2: enable direct sampling 2 (usually Q)\n" - "\t offset: enable offset tuning\n" - "\tfilename ('-' means stdout)\n" - "\t omitting the filename also uses stdout\n\n" - "Experimental options:\n" - "\t[-r resample_rate (default: none / same as -s)]\n" - "\t[-t squelch_delay (default: 10)]\n" - "\t +values will mute/scan, -values will exit\n" - "\t[-F fir_size (default: off)]\n" - "\t enables low-leakage downsample filter\n" - "\t size can be 0 or 9. 0 has bad roll off\n" - "\t[-A std/fast/lut choose atan math (default: std)]\n" - //"\t[-C clip_path (default: off)\n" - //"\t (create time stamped raw clips, requires squelch)\n" - //"\t (path must have '\%s' and will expand to date_time_freq)\n" - //"\t[-H hop_fifo (default: off)\n" - //"\t (fifo will contain the active frequency)\n" - "\n" - "Produces signed 16 bit ints, use Sox or aplay to hear them.\n" - "\trtl_fm ... | play -t raw -r 24k -es -b 16 -c 1 -V1 -\n" - "\t | aplay -r 24k -f S16_LE -t raw -c 1\n" - "\t -M wbfm | play -r 32k ... \n" - "\t -s 22050 | multimon -t raw /dev/stdin\n\n"); - 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(dongle.dev); - return TRUE; - } - return FALSE; -} -#else -static void sighandler(int signum) -{ - fprintf(stderr, "Signal caught, exiting!\n"); - do_exit = 1; - rtlsdr_cancel_async(dongle.dev); -} -#endif - -/* more cond dumbness */ -#define safe_cond_signal(n, m) pthread_mutex_lock(m); pthread_cond_signal(n); pthread_mutex_unlock(m) -#define safe_cond_wait(n, m) pthread_mutex_lock(m); pthread_cond_wait(n, m); pthread_mutex_unlock(m) - -/* {length, coef, coef, coef} and scaled by 2^15 - for now, only length 9, optimal way to get +85% bandwidth */ -#define CIC_TABLE_MAX 10 -int cic_9_tables[][10] = { - {0,}, - {9, -156, -97, 2798, -15489, 61019, -15489, 2798, -97, -156}, - {9, -128, -568, 5593, -24125, 74126, -24125, 5593, -568, -128}, - {9, -129, -639, 6187, -26281, 77511, -26281, 6187, -639, -129}, - {9, -122, -612, 6082, -26353, 77818, -26353, 6082, -612, -122}, - {9, -120, -602, 6015, -26269, 77757, -26269, 6015, -602, -120}, - {9, -120, -582, 5951, -26128, 77542, -26128, 5951, -582, -120}, - {9, -119, -580, 5931, -26094, 77505, -26094, 5931, -580, -119}, - {9, -119, -578, 5921, -26077, 77484, -26077, 5921, -578, -119}, - {9, -119, -577, 5917, -26067, 77473, -26067, 5917, -577, -119}, - {9, -199, -362, 5303, -25505, 77489, -25505, 5303, -362, -199}, -}; - -#if defined(_MSC_VER) && (_MSC_VER < 1800) -double log2(double n) -{ - return log(n) / log(2.0); -} -#endif - -void rotate_90(unsigned char *buf, uint32_t len) -/* 90 rotation is 1+0j, 0+1j, -1+0j, 0-1j - or [0, 1, -3, 2, -4, -5, 7, -6] */ -{ - uint32_t i; - unsigned char tmp; - for (i=0; ilp_len) { - d->now_r += d->lowpassed[i]; - d->now_j += d->lowpassed[i+1]; - i += 2; - d->prev_index++; - if (d->prev_index < d->downsample) { - continue; - } - d->lowpassed[i2] = d->now_r; // * d->output_scale; - d->lowpassed[i2+1] = d->now_j; // * d->output_scale; - d->prev_index = 0; - d->now_r = 0; - d->now_j = 0; - i2 += 2; - } - d->lp_len = i2; -} - -int low_pass_simple(int16_t *signal2, int len, int step) -// no wrap around, length must be multiple of step -{ - int i, i2, sum; - for(i=0; i < len; i+=step) { - sum = 0; - for(i2=0; i2rate_out; - int slow = s->rate_out2; - while (i < s->result_len) { - s->now_lpr += s->result[i]; - i++; - s->prev_lpr_index += slow; - if (s->prev_lpr_index < fast) { - continue; - } - s->result[i2] = (int16_t)(s->now_lpr / (fast/slow)); - s->prev_lpr_index -= fast; - s->now_lpr = 0; - i2 += 1; - } - s->result_len = i2; -} - -void fifth_order(int16_t *data, int length, int16_t *hist) -/* for half of interleaved data */ -{ - int i; - int16_t a, b, c, d, e, f; - a = hist[1]; - b = hist[2]; - c = hist[3]; - d = hist[4]; - e = hist[5]; - f = data[0]; - /* a downsample should improve resolution, so don't fully shift */ - data[0] = (a + (b+e)*5 + (c+d)*10 + f) >> 4; - for (i=4; i> 4; - } - /* archive */ - hist[0] = a; - hist[1] = b; - hist[2] = c; - hist[3] = d; - hist[4] = e; - hist[5] = f; -} - -void generic_fir(int16_t *data, int length, int *fir, int16_t *hist) -/* Okay, not at all generic. Assumes length 9, fix that eventually. */ -{ - int d, temp, sum; - for (d=0; d> 15 ; - hist[0] = hist[1]; - hist[1] = hist[2]; - hist[2] = hist[3]; - hist[3] = hist[4]; - hist[4] = hist[5]; - hist[5] = hist[6]; - hist[6] = hist[7]; - hist[7] = hist[8]; - hist[8] = temp; - } -} - -/* define our own complex math ops - because ARMv5 has no hardware float */ - -void multiply(int ar, int aj, int br, int bj, int *cr, int *cj) -{ - *cr = ar*br - aj*bj; - *cj = aj*br + ar*bj; -} - -int polar_discriminant(int ar, int aj, int br, int bj) -{ - int cr, cj; - double angle; - multiply(ar, aj, br, -bj, &cr, &cj); - angle = atan2((double)cj, (double)cr); - return (int)(angle / 3.14159 * (1<<14)); -} - -int fast_atan2(int y, int x) -/* pre scaled for int16 */ -{ - int yabs, angle; - int pi4=(1<<12), pi34=3*(1<<12); // note pi = 1<<14 - if (x==0 && y==0) { - return 0; - } - yabs = y; - if (yabs < 0) { - yabs = -yabs; - } - if (x >= 0) { - angle = pi4 - pi4 * (x-yabs) / (x+yabs); - } else { - angle = pi34 - pi4 * (x+yabs) / (yabs-x); - } - if (y < 0) { - return -angle; - } - return angle; -} - -int polar_disc_fast(int ar, int aj, int br, int bj) -{ - int cr, cj; - multiply(ar, aj, br, -bj, &cr, &cj); - return fast_atan2(cj, cr); -} - -int atan_lut_init(void) -{ - int i = 0; - - atan_lut = malloc(atan_lut_size * sizeof(int)); - - for (i = 0; i < atan_lut_size; i++) { - atan_lut[i] = (int) (atan((double) i / (1< 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 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; jdownsample_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; ilp_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; imute; 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, dongle.direct_sampling);} - 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("direct2", optarg) == 0) { - dongle.direct_sampling = 2;} - 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 -- cgit v1.2.3