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rtl_airband.cpp
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/*
* RTLSDR AM/NFM demodulator, mixer, streamer and recorder
*
* Copyright (c) 2014 Wong Man Hang <microtony@gmail.com>
* Copyright (c) 2015-2020 Tomasz Lemiech <szpajder@gmail.com>
*
* 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 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#if defined USE_BCM_VC && !defined __arm__
#error Broadcom VideoCore support can only be enabled on ARM builds
#endif
// From this point we may safely assume that USE_BCM_VC implies __arm__
#if defined (__arm__) || defined (__aarch64__)
#ifdef USE_BCM_VC
#include "hello_fft/mailbox.h"
#include "hello_fft/gpu_fft.h"
#endif
#else /* x86 */
#include <xmmintrin.h>
#endif /* x86 */
#include <unistd.h>
#include <pthread.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#ifndef __MINGW32__
#include <sys/wait.h>
#else
#include <windows.h>
#endif
#include <algorithm>
#include <csignal>
#include <cstdarg>
#include <cerrno>
#include <iostream>
#include <cstring>
#include <cstdio>
#include <cassert>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <libconfig.h++>
#include <stdint.h> // uint8_t
#include <ogg/ogg.h>
#include <vorbis/vorbisenc.h>
#include <shout/shout.h>
#include <lame/lame.h>
#include "input-common.h"
#include "rtl_airband.h"
#ifdef WITH_PROFILING
#include "gperftools/profiler.h"
#endif
using namespace std;
using namespace libconfig;
device_t* devices;
mixer_t* mixers;
int device_count, mixer_count;
static int devices_running = 0;
int foreground = 0; // daemonize
int tui = 0; // do not display textual user interface
int do_syslog = 1;
int shout_metadata_delay = 3;
volatile int do_exit = 0;
bool use_localtime = false;
bool multiple_demod_threads = false;
bool log_scan_activity = false;
char *stats_filepath = NULL;
size_t fft_size_log = DEFAULT_FFT_SIZE_LOG;
size_t fft_size = 1 << fft_size_log;
#ifdef NFM
float alpha = exp(-1.0f/(WAVE_RATE * 2e-4));
enum fm_demod_algo {
FM_FAST_ATAN2,
FM_QUADRI_DEMOD
};
enum fm_demod_algo fm_demod = FM_FAST_ATAN2;
#endif
#if DEBUG
char *debug_path;
#endif
pthread_cond_t mp3_cond = PTHREAD_COND_INITIALIZER;
pthread_mutex_t mp3_mutex = PTHREAD_MUTEX_INITIALIZER;
#ifndef __MINGW32__
void sighandler(int sig) {
log(LOG_NOTICE, "Got signal %d, exiting\n", sig);
do_exit = 1;
}
#else
BOOL WINAPI sighandler(int signum) {
if (CTRL_C_EVENT == signum) {
fprintf(stderr, "Signal caught, exiting!\n");
do_exit = 1;
return TRUE;
}
return FALSE;
}
#endif
void* controller_thread(void* params) {
device_t *dev = (device_t*)params;
int i = 0;
int consecutive_squelch_off = 0;
int new_centerfreq = 0;
struct timeval tv;
if(dev->channels[0].freq_count < 2) return 0;
while(!do_exit) {
SLEEP(200);
if(dev->channels[0].axcindicate == NO_SIGNAL) {
if(consecutive_squelch_off < 10) {
consecutive_squelch_off++;
} else {
i++; i %= dev->channels[0].freq_count;
dev->channels[0].freq_idx = i;
new_centerfreq = dev->channels[0].freqlist[i].frequency + 20 * (double)(dev->input->sample_rate / fft_size);
if(input_set_centerfreq(dev->input, new_centerfreq) < 0) {
break;
}
}
} else {
if(consecutive_squelch_off == 10) {
if(log_scan_activity)
log(LOG_INFO, "Activity on %7.3f MHz\n", dev->channels[0].freqlist[i].frequency / 1000000.0);
if(i != dev->last_frequency) {
// squelch has just opened on a new frequency - we might need to update outputs' metadata
gettimeofday(&tv, NULL);
tag_queue_put(dev, i, tv);
dev->last_frequency = i;
}
}
consecutive_squelch_off = 0;
}
}
return 0;
}
void multiply(float ar, float aj, float br, float bj, float *cr, float *cj)
{
*cr = ar*br - aj*bj;
*cj = aj*br + ar*bj;
}
#ifdef NFM
float fast_atan2(float y, float x)
{
float yabs, angle;
float pi4=M_PI_4, pi34=3*M_PI_4;
if (x==0.0f && y==0.0f) {
return 0;
}
yabs = y;
if (yabs < 0.0f) {
yabs = -yabs;
}
if (x >= 0.0f) {
angle = pi4 - pi4 * (x-yabs) / (x+yabs);
} else {
angle = pi34 - pi4 * (x+yabs) / (yabs-x);
}
if (y < 0.0f) {
return -angle;
}
return angle;
}
float polar_disc_fast(float ar, float aj, float br, float bj)
{
float cr, cj;
multiply(ar, aj, br, -bj, &cr, &cj);
return (float)(fast_atan2(cj, cr) * M_1_PI);
}
float fm_quadri_demod(float ar, float aj, float br, float bj) {
return (float)((br*aj - ar*bj)/(ar*ar + aj*aj + 1.0f) * M_1_PI);
}
#endif
class AFC
{
const status _prev_axcindicate;
#ifdef USE_BCM_VC
float square(const GPU_FFT_COMPLEX *fft_results, size_t index)
{
return fft_results[index].re * fft_results[index].re + fft_results[index].im * fft_results[index].im;
}
#else
float square(const fftwf_complex *fft_results, size_t index)
{
return fft_results[index][0] * fft_results[index][0] + fft_results[index][1] * fft_results[index][1];
}
#endif
template <class FFT_RESULTS, int STEP>
size_t check(const FFT_RESULTS* fft_results, const size_t base, const float base_value, unsigned char afc)
{
float threshold = 0;
size_t bin;
for (bin = base;; bin+= STEP) {
if (STEP < 0) {
if (bin < -STEP)
break;
} else if ( (size_t)(bin + STEP) >= fft_size)
break;
const float value = square(fft_results, (size_t)(bin + STEP));
if (value <= base_value)
break;
if (base == (size_t)bin) {
threshold = (value - base_value) / (float)afc;
} else {
if ((value - base_value) < threshold)
break;
threshold+= threshold / 10.0;
}
}
return bin;
}
public:
AFC(device_t* dev, int index) : _prev_axcindicate(dev->channels[index].axcindicate)
{
}
template <class FFT_RESULTS>
void finalize(device_t* dev, int index, const FFT_RESULTS* fft_results)
{
channel_t *channel = &dev->channels[index];
if (channel->afc==0)
return;
const char axcindicate = channel->axcindicate;
if (axcindicate != NO_SIGNAL && _prev_axcindicate == NO_SIGNAL) {
const size_t base = dev->base_bins[index];
const float base_value = square(fft_results, base);
size_t bin = check<FFT_RESULTS, -1>(fft_results, base, base_value, channel->afc);
if (bin == base)
bin = check<FFT_RESULTS, 1>(fft_results, base, base_value, channel->afc);
if (dev->bins[index] != bin) {
#ifdef AFC_LOGGING
log(LOG_INFO, "AFC device=%d channel=%d: base=%zu prev=%zu now=%zu\n", dev->device, index, base, dev->bins[index], bin);
#endif
dev->bins[index] = bin;
if ( bin > base )
channel->axcindicate = AFC_UP;
else if ( bin < base )
channel->axcindicate = AFC_DOWN;
}
}
else if (axcindicate == NO_SIGNAL && _prev_axcindicate != NO_SIGNAL)
dev->bins[index] = dev->base_bins[index];
}
};
void init_demod(demod_params_t *params, int start_device, int end_device) {
assert(params != NULL);
params->start_device = start_device;
params->end_device = end_device;
#ifndef USE_BCM_VC
params->fftin = fftwf_alloc_complex(fft_size);
params->fftout = fftwf_alloc_complex(fft_size);
params->fft = fftwf_plan_dft_1d(fft_size, params->fftin, params->fftout, FFTW_FORWARD, FFTW_MEASURE);
#endif
}
int next_device(demod_params_t *params, int current) {
if (current == params->end_device) {
return params->start_device;
}
return current + 1;
}
void *demodulate(void *params) {
assert(params != NULL);
demod_params_t *demod_params = (demod_params_t *) params;
// initialize fft engine
#ifdef USE_BCM_VC
int mb = mbox_open();
struct GPU_FFT *fft;
int ret = gpu_fft_prepare(mb, fft_size_log, GPU_FFT_FWD, FFT_BATCH, &fft);
switch (ret) {
case -1:
log(LOG_CRIT, "Unable to enable V3D. Please check your firmware is up to date.\n");
error();
break;
case -2:
log(LOG_CRIT, "log2_N=%d not supported. Try between 8 and 17.\n", fft_size_log);
error();
break;
case -3:
log(LOG_CRIT, "Out of memory. Try a smaller batch or increase GPU memory.\n");
error();
break;
}
#else
fftwf_complex* fftin = demod_params->fftin;
fftwf_complex* fftout = demod_params->fftout;
#endif
ALIGN float ALIGN2 levels_u8[256], levels_s8[256];
float *levels_ptr = NULL;
for (int i=0; i<256; i++) {
levels_u8[i] = i-127.5f;
}
for (int16_t i=-127; i<128; i++) {
levels_s8[(uint8_t)i] = i;
}
// initialize fft window
// blackman 7
// the whole matrix is computed
ALIGN float ALIGN2 window[fft_size * 2];
const double a0 = 0.27105140069342f;
const double a1 = 0.43329793923448f; const double a2 = 0.21812299954311f;
const double a3 = 0.06592544638803f; const double a4 = 0.01081174209837f;
const double a5 = 0.00077658482522f; const double a6 = 0.00001388721735f;
for (size_t i = 0; i < fft_size; i++) {
double x = a0 - (a1 * cos((2.0 * M_PI * i) / (fft_size-1)))
+ (a2 * cos((4.0 * M_PI * i) / (fft_size - 1)))
- (a3 * cos((6.0 * M_PI * i) / (fft_size - 1)))
+ (a4 * cos((8.0 * M_PI * i) / (fft_size - 1)))
- (a5 * cos((10.0 * M_PI * i) / (fft_size - 1)))
+ (a6 * cos((12.0 * M_PI * i) / (fft_size - 1)));
window[i * 2] = window[i * 2 + 1] = (float)x;
}
struct timeval ts, te;
if(DEBUG)
gettimeofday(&ts, NULL);
size_t available;
int device_num = demod_params->start_device;
while (true) {
if(do_exit) {
#ifdef USE_BCM_VC
log(LOG_INFO, "Freeing GPU memory\n");
gpu_fft_release(fft);
#endif
return NULL;
}
device_t* dev = devices + device_num;
pthread_mutex_lock(&dev->input->buffer_lock);
if(dev->input->bufe >= dev->input->bufs)
available = dev->input->bufe - dev->input->bufs;
else
available = dev->input->buf_size - dev->input->bufs + dev->input->bufe;
pthread_mutex_unlock(&dev->input->buffer_lock);
if(devices_running == 0) {
log(LOG_ERR, "All receivers failed, exiting\n");
do_exit = 1;
continue;
}
if (dev->input->state != INPUT_RUNNING) {
if(dev->input->state == INPUT_FAILED) {
dev->input->state = INPUT_DISABLED;
disable_device_outputs(dev);
devices_running--;
}
device_num = next_device(demod_params, device_num);
continue;
}
// number of input bytes per output wave sample (x 2 for I and Q)
size_t bps = 2 * dev->input->bytes_per_sample * (size_t)round((double)dev->input->sample_rate / (double)WAVE_RATE);
if (available < bps * FFT_BATCH + fft_size * dev->input->bytes_per_sample * 2) {
// move to next device
device_num = next_device(demod_params, device_num);
SLEEP(10);
continue;
}
if(dev->input->sfmt == SFMT_S16) {
float const scale = 127.5f / dev->input->fullscale;
#ifdef USE_BCM_VC
struct GPU_FFT_COMPLEX *ptr = fft->in;
for(size_t b = 0; b < FFT_BATCH; b++, ptr += fft->step) {
short *buf2 = (short *)(dev->input->buffer + dev->input->bufs + b * bps);
for(size_t i = 0; i < fft_size; i++, buf2 += 2) {
ptr[i].re = scale * (float)buf2[0] * window[i*2];
ptr[i].im = scale * (float)buf2[1] * window[i*2];
}
}
#else
short *buf2 = (short *)(dev->input->buffer + dev->input->bufs);
for(size_t i = 0; i < fft_size; i++, buf2 += 2) {
fftin[i][0] = scale * (float)buf2[0] * window[i*2];
fftin[i][1] = scale * (float)buf2[1] * window[i*2];
}
#endif
} else if(dev->input->sfmt == SFMT_F32) {
float const scale = 127.5f / dev->input->fullscale;
#ifdef USE_BCM_VC
struct GPU_FFT_COMPLEX *ptr = fft->in;
for(size_t b = 0; b < FFT_BATCH; b++, ptr += fft->step) {
float *buf2 = (float *)(dev->input->buffer + dev->input->bufs + b * bps);
for(size_t i = 0; i < fft_size; i++, buf2 += 2) {
ptr[i].re = scale * buf2[0] * window[i*2];
ptr[i].im = scale * buf2[1] * window[i*2];
}
}
#else
float *buf2 = (float *)(dev->input->buffer + dev->input->bufs);
for(size_t i = 0; i < fft_size; i++, buf2 += 2) {
fftin[i][0] = scale * buf2[0] * window[i*2];
fftin[i][1] = scale * buf2[1] * window[i*2];
}
#endif
} else { // S8 or U8
levels_ptr = (dev->input->sfmt == SFMT_U8 ? levels_u8 : levels_s8);
#if defined USE_BCM_VC
sample_fft_arg sfa = {fft_size / 4, fft->in};
for (size_t i = 0; i < FFT_BATCH; i++) {
samplefft(&sfa, dev->input->buffer + dev->input->bufs + i * bps, window, levels_ptr);
sfa.dest+= fft->step;
}
#elif defined (__arm__) || defined (__aarch64__)
unsigned char* buf2 = dev->input->buffer + dev->input->bufs;
for (size_t i = 0; i < fft_size; i++, buf2 += 2) {
float re = levels_ptr[buf2[0]] * window[i*2];
float im = levels_ptr[buf2[1]] * window[i*2];
fftin[i][0] = re;
fftin[i][1] = im;
}
#else /* x86 */
unsigned char* buf2 = dev->input->buffer + dev->input->bufs;
for (size_t i = 0; i < fft_size; i += 2, buf2 += 4) {
__m128 a = _mm_set_ps(levels_ptr[buf2[3]], levels_ptr[buf2[2]], levels_ptr[buf2[1]], levels_ptr[buf2[0]]);
__m128 b = _mm_load_ps(&window[i * 2]);
a = _mm_mul_ps(a, b);
_mm_store_ps(&fftin[i][0], a);
}
#endif
}
#ifdef USE_BCM_VC
gpu_fft_execute(fft);
#else
fftwf_execute(demod_params->fft);
#endif
#ifdef USE_BCM_VC
for (int i = 0; i < dev->channel_count; i++) {
float *wavein = dev->channels[i].wavein + dev->waveend;
__builtin_prefetch(wavein, 1);
const int bin = dev->bins[i];
const GPU_FFT_COMPLEX *fftout = fft->out + bin;
for (int j = 0; j < FFT_BATCH; j++, ++wavein, fftout+= fft->step)
*wavein = sqrtf(fftout->im * fftout->im + fftout->re * fftout->re);
}
for (int j = 0; j < dev->channel_count; j++) {
if(dev->channels[j].needs_raw_iq) {
struct GPU_FFT_COMPLEX *ptr = fft->out;
for (int job = 0; job < FFT_BATCH; job++) {
dev->channels[j].iq_in[2*(dev->waveend+job)] = ptr[dev->bins[j]].re;
dev->channels[j].iq_in[2*(dev->waveend+job)+1] = ptr[dev->bins[j]].im;
ptr += fft->step;
}
}
}
#else
for (int j = 0; j < dev->channel_count; j++) {
dev->channels[j].wavein[dev->waveend] =
sqrtf(fftout[dev->bins[j]][0] * fftout[dev->bins[j]][0] + fftout[dev->bins[j]][1] * fftout[dev->bins[j]][1]);
if(dev->channels[j].needs_raw_iq) {
dev->channels[j].iq_in[2*dev->waveend] = fftout[dev->bins[j]][0];
dev->channels[j].iq_in[2*dev->waveend+1] = fftout[dev->bins[j]][1];
}
}
#endif // USE_BCM_VC
dev->waveend += FFT_BATCH;
if (dev->waveend >= WAVE_BATCH + AGC_EXTRA) {
for (int i = 0; i < dev->channel_count; i++) {
AFC afc(dev, i);
channel_t* channel = dev->channels + i;
freq_t *fparms = channel->freqlist + channel->freq_idx;
#if defined (__arm__) || defined (__aarch64__)
float agcmin2 = fparms->agcmin * 4.5f;
for (int j = 0; j < WAVE_BATCH + AGC_EXTRA; j++) {
channel->waveref[j] = min(channel->wavein[j], agcmin2);
}
#else
__m128 agccap = _mm_set1_ps(fparms->agcmin * 4.5f);
for (int j = 0; j < WAVE_BATCH + AGC_EXTRA; j += 4) {
__m128 t = _mm_loadu_ps(channel->wavein + j);
_mm_storeu_ps(channel->waveref + j, _mm_min_ps(t, agccap));
}
#endif
for (int j = AGC_EXTRA; j < WAVE_BATCH + AGC_EXTRA; j++) {
// auto noise floor
if (fparms->sqlevel < 0 && j % 16 == 0) {
fparms->agcmin = fparms->agcmin * 0.97f + min(fparms->agcavgslow, fparms->agcmin) * 0.03f + 0.0001f;
}
// average power
fparms->agcavgslow = fparms->agcavgslow * 0.99f + channel->waveref[j] * 0.01f;
float sqlevel = fparms->sqlevel >= 0 ? (float)fparms->sqlevel : 3.0f * fparms->agcmin;
if (channel->agcsq > 0) {
channel->agcsq = max(channel->agcsq - 1, 1);
if (channel->agcsq == 1 && fparms->agcavgslow > sqlevel) {
channel->agcsq = -AGC_EXTRA * 2;
channel->axcindicate = SIGNAL;
if(channel->modulation == MOD_AM) {
// fade in
for (int k = j - AGC_EXTRA; k < j; k++) {
if (channel->wavein[k] > sqlevel) {
fparms->agcavgfast = fparms->agcavgfast * 0.9f + channel->wavein[k] * 0.1f;
}
}
}
}
} else {
if (channel->wavein[j] > sqlevel) {
if(channel->modulation == MOD_AM)
fparms->agcavgfast = fparms->agcavgfast * 0.995f + channel->wavein[j] * 0.005f;
fparms->agclow = 0;
} else {
fparms->agclow++;
}
channel->agcsq = min(channel->agcsq + 1, -1);
if ((channel->agcsq == -1 && fparms->agcavgslow < sqlevel) || fparms->agclow == AGC_EXTRA - 12) {
channel->agcsq = AGC_EXTRA * 2;
channel->axcindicate = NO_SIGNAL;
if(channel->modulation == MOD_AM) {
// fade out
for (int k = j - AGC_EXTRA + 1; k < j; k++) {
channel->waveout[k] = channel->waveout[k - 1] * 0.94f;
}
}
}
}
bool signal_filtered = false;
if(channel->agcsq < 0 && channel->needs_raw_iq) {
// remove phase rotation introduced by FFT sliding window
float swf, cwf, re, im;
sincosf_lut(channel->dm_phi, &swf, &cwf);
multiply(channel->iq_in[2*(j - AGC_EXTRA)], channel->iq_in[2*(j - AGC_EXTRA)+1], cwf, -swf, &re, &im);
channel->dm_phi += channel->dm_dphi;
channel->dm_phi &= 0xffffff;
// apply lowpass filter, will be a no-op if not configured
fparms->lowpass_filter.apply(re, im);
// update I/Q and wave
channel->iq_in[2*(j - AGC_EXTRA)] = re;
channel->iq_in[2*(j - AGC_EXTRA)+1] = im;
channel->wavein[j] = sqrt(re * re + im * im);
if(fparms->lowpass_filter.enabled()) {
fparms->filter_avg = fparms->filter_avg * 0.999f + channel->wavein[j] * 0.001f;
if (fparms->filter_avg < sqlevel) {
signal_filtered = true;
channel->axcindicate = NO_SIGNAL;
} else {
channel->axcindicate = SIGNAL;
}
}
}
if(channel->agcsq != -1 || signal_filtered) {
channel->waveout[j] = 0;
if(channel->has_iq_outputs) {
channel->iq_out[2*(j - AGC_EXTRA)] = 0;
channel->iq_out[2*(j - AGC_EXTRA)+1] = 0;
}
} else {
const float &re = channel->iq_in[2*(j - AGC_EXTRA)];
const float &im = channel->iq_in[2*(j - AGC_EXTRA)+1];
if(channel->has_iq_outputs) {
channel->iq_out[2*(j - AGC_EXTRA)] = re;
channel->iq_out[2*(j - AGC_EXTRA)+1] = im;
}
if(channel->modulation == MOD_AM) {
channel->waveout[j] = (channel->wavein[j - AGC_EXTRA] - fparms->agcavgfast) / (fparms->agcavgfast * 1.5f);
if (abs(channel->waveout[j]) > 0.8f) {
channel->waveout[j] *= 0.85f;
fparms->agcavgfast *= 1.15f;
}
}
#ifdef NFM
else if(channel->modulation == MOD_NFM) {
// FM demod
if(fm_demod == FM_FAST_ATAN2) {
channel->waveout[j] = polar_disc_fast(re, im, channel->pr, channel->pj);
} else if(fm_demod == FM_QUADRI_DEMOD) {
channel->waveout[j] = fm_quadri_demod(re, im, channel->pr, channel->pj);
}
channel->pr = re;
channel->pj = im;
// de-emphasis IIR + DC blocking
fparms->agcavgfast = fparms->agcavgfast * 0.995f + channel->waveout[j] * 0.005f;
channel->waveout[j] -= fparms->agcavgfast;
channel->waveout[j] = channel->waveout[j] * (1.0f - channel->alpha) + channel->waveout[j-1] * channel->alpha;
}
#endif // NFM
// apply the notch filter. If no filter configured, this will no-op
fparms->notch_filter.apply(channel->waveout[j]);
}
}
memmove(channel->wavein, channel->wavein + WAVE_BATCH, (dev->waveend - WAVE_BATCH) * sizeof(float));
if(channel->needs_raw_iq) {
memmove(channel->iq_in, channel->iq_in + 2 * WAVE_BATCH, (dev->waveend - WAVE_BATCH) * sizeof(float) * 2);
}
#ifdef USE_BCM_VC
afc.finalize(dev, i, fft->out);
#else
afc.finalize(dev, i, demod_params->fftout);
#endif
if (tui) {
if(dev->mode == R_SCAN) {
GOTOXY(0, device_num * 17 + dev->row + 3);
printf("%4.0f/%3.0f%c %7.3f ",
fparms->agcavgslow,
(fparms->sqlevel >= 0 ? fparms->sqlevel : fparms->agcmin),
channel->axcindicate,
(dev->channels[0].freqlist[channel->freq_idx].frequency / 1000000.0));
} else {
GOTOXY(i*10, device_num * 17 + dev->row + 3);
printf("%4.0f/%3.0f%c ",
fparms->agcavgslow,
(fparms->sqlevel >= 0 ? fparms->sqlevel : fparms->agcmin),
channel->axcindicate);
}
fflush(stdout);
}
if (channel->axcindicate != NO_SIGNAL) {
channel->freqlist[channel->freq_idx].active_counter++;
}
}
dev->waveavail = 1;
dev->waveend -= WAVE_BATCH;
if(DEBUG) {
gettimeofday(&te, NULL);
debug_bulk_print("waveavail %lu.%lu %lu\n", te.tv_sec, te.tv_usec, (te.tv_sec - ts.tv_sec) * 1000000UL + te.tv_usec - ts.tv_usec);
ts.tv_sec = te.tv_sec;
ts.tv_usec = te.tv_usec;
}
safe_cond_signal(&mp3_cond, &mp3_mutex);
dev->row++;
if (dev->row == 12) {
dev->row = 0;
}
}
dev->input->bufs = (dev->input->bufs + bps * FFT_BATCH) % dev->input->buf_size;
device_num = next_device(demod_params, device_num);
}
}
void usage() {
cout<<"Usage: rtl_airband [options] [-c <config_file_path>]\n\
\t-h\t\t\tDisplay this help text\n\
\t-f\t\t\tRun in foreground, display textual waterfalls\n\
\t-F\t\t\tRun in foreground, do not display waterfalls (for running as a systemd service)\n";
#ifdef NFM
cout<<"\t-Q\t\t\tUse quadri correlator for FM demodulation (default is atan2)\n";
#endif
#if DEBUG
cout<<"\t-d <file>\t\tLog debugging information to <file> (default is "<<DEBUG_PATH<<")\n";
#endif
cout<<"\t-e\t\t\tPrint messages to standard error (disables syslog logging)\n";
cout<<"\t-c <config_file_path>\tUse non-default configuration file\n\t\t\t\t(default: "<<CFGFILE<<")\n\
\t-v\t\t\tDisplay version and exit\n";
exit(EXIT_SUCCESS);
}
static int count_devices_running() {
int ret = 0;
for(int i = 0; i < device_count; i++) {
if(devices[i].input->state == INPUT_RUNNING) {
ret++;
}
}
return ret;
}
int main(int argc, char* argv[]) {
#ifdef WITH_PROFILING
ProfilerStart("rtl_airband.prof");
#endif
#pragma GCC diagnostic ignored "-Wwrite-strings"
char *cfgfile = CFGFILE;
char *pidfile = PIDFILE;
#pragma GCC diagnostic warning "-Wwrite-strings"
int opt;
char optstring[16] = "efFhvc:";
#ifdef NFM
strcat(optstring, "Q");
#endif
#if DEBUG
strcat(optstring, "d:");
#endif
while((opt = getopt(argc, argv, optstring)) != -1) {
switch(opt) {
#ifdef NFM
case 'Q':
fm_demod = FM_QUADRI_DEMOD;
break;
#endif
#if DEBUG
case 'd':
debug_path = strdup(optarg);
break;
#endif
case 'e':
do_syslog = 0;
break;
case 'f':
foreground = 1;
tui = 1;
break;
case 'F':
foreground = 1;
tui = 0;
break;
case 'c':
cfgfile = optarg;
break;
case 'v':
cout<<"RTLSDR-Airband version "<<RTL_AIRBAND_VERSION<<"\n";
exit(EXIT_SUCCESS);
case 'h':
default:
usage();
break;
}
}
#if DEBUG
if(!debug_path) debug_path = strdup(DEBUG_PATH);
init_debug(debug_path);
#endif
#if !defined (__arm__) && !defined (__aarch64__)
#define cpuid(func,ax,bx,cx,dx)\
__asm__ __volatile__ ("cpuid":\
"=a" (ax), "=b" (bx), "=c" (cx), "=d" (dx) : "a" (func));
int a,b,c,d;
cpuid(1,a,b,c,d);
if((int)((d >> 25) & 0x1)) {
/* NOOP */
} else {
printf("Unsupported CPU.\n");
error();
}
#endif /* !__arm__ */
// If executing other than as root, GPU memory gets alloc'd and the
// 'permission denied' message on /dev/mem kills rtl_airband without
// releasing GPU memory.
#ifdef USE_BCM_VC
// XXX should probably do this check in other circumstances also.
if(0 != getuid()) {
cerr<<"FFT library requires that rtl_airband be executed as root\n";
exit(1);
}
#endif
// read config
try {
Config config;
config.readFile(cfgfile);
Setting &root = config.getRoot();
if(root.exists("pidfile")) pidfile = strdup(root["pidfile"]);
if(root.exists("fft_size")) {
int fsize = (int)(root["fft_size"]);
fft_size_log = 0;
for(size_t i = MIN_FFT_SIZE_LOG; i <= MAX_FFT_SIZE_LOG; i++) {
if(fsize == 1 << i) {
fft_size = (size_t)fsize;
fft_size_log = i;
break;
}
}
if(fft_size_log == 0) {
cerr<<"Configuration error: invalid fft_size value (must be a power of two in range "<<
(1<<MIN_FFT_SIZE_LOG)<<"-"<<(1<<MAX_FFT_SIZE_LOG)<<")\n";
error();
}
}
if(root.exists("shout_metadata_delay")) shout_metadata_delay = (int)(root["shout_metadata_delay"]);
if(shout_metadata_delay < 0 || shout_metadata_delay > 2*TAG_QUEUE_LEN) {
cerr<<"Configuration error: shout_metadata_delay is out of allowed range (0-"<<2 * TAG_QUEUE_LEN<<")\n";
error();
}
if(root.exists("localtime") && (bool)root["localtime"] == true)
use_localtime = true;
if(root.exists("multiple_demod_threads") && (bool)root["multiple_demod_threads"] == true) {
#ifdef USE_BCM_VC
cerr<<"Using multiple_demod_threads not supported with BCM VideoCore for FFT\n";
exit(1);
#endif
multiple_demod_threads = true;
}
if(root.exists("log_scan_activity") && (bool)root["log_scan_activity"] == true)
log_scan_activity = true;
if(root.exists("stats_filepath"))
stats_filepath = strdup(root["stats_filepath"]);
#ifdef NFM
if(root.exists("tau"))
alpha = ((int)root["tau"] == 0 ? 0.0f : exp(-1.0f/(WAVE_RATE * 1e-6 * (int)root["tau"])));
#endif
Setting &devs = config.lookup("devices");
device_count = devs.getLength();
if (device_count < 1) {
cerr<<"Configuration error: no devices defined\n";
error();
}
#ifndef __MINGW32__
struct sigaction sigact, pipeact;
memset(&sigact, 0, sizeof(sigact));
memset(&pipeact, 0, sizeof(pipeact));
pipeact.sa_handler = SIG_IGN;
sigact.sa_handler = &sighandler;
sigaction(SIGPIPE, &pipeact, NULL);
sigaction(SIGHUP, &sigact, NULL);
sigaction(SIGINT, &sigact, NULL);
sigaction(SIGQUIT, &sigact, NULL);
sigaction(SIGTERM, &sigact, NULL);
#else
SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
#endif
devices = (device_t *)XCALLOC(device_count, sizeof(device_t));
shout_init();
if(do_syslog) openlog("rtl_airband", LOG_PID, LOG_DAEMON);
if(root.exists("mixers")) {
Setting &mx = config.lookup("mixers");
mixers = (mixer_t *)XCALLOC(mx.getLength(), sizeof(struct mixer_t));
if((mixer_count = parse_mixers(mx)) > 0) {
mixers = (mixer_t *)XREALLOC(mixers, mixer_count * sizeof(struct mixer_t));
} else {
free(mixers);
}
} else {
mixer_count = 0;
}
uint32_t devs_enabled = parse_devices(devs);
if (devs_enabled < 1) {
cerr<<"Configuration error: no devices defined\n";
error();
}
device_count = devs_enabled;
debug_print("mixer_count=%d\n", mixer_count);
for(int z = 0; z < mixer_count; z++) {
mixer_t *m = &mixers[z];
debug_print("mixer[%d]: name=%s, input_count=%d, output_count=%d\n", z, m->name, m->input_count, m->channel.output_count);
}
} catch(const FileIOException &e) {
cerr<<"Cannot read configuration file "<<cfgfile<<"\n";
error();
} catch(const ParseException &e) {
cerr<<"Error while parsing configuration file "<<cfgfile<<" line "<<e.getLine()<<": "<<e.getError()<<"\n";
error();
} catch(const SettingNotFoundException &e) {
cerr<<"Configuration error: mandatory parameter missing: "<<e.getPath()<<"\n";
error();
} catch(const SettingTypeException &e) {
cerr<<"Configuration error: invalid parameter type: "<<e.getPath()<<"\n";
error();
} catch(const ConfigException &e) {
cerr<<"Unhandled config exception\n";
error();
}
log(LOG_INFO, "RTLSDR-Airband version %s starting\n", RTL_AIRBAND_VERSION);
#ifndef __MINGW32__ // Fork Were Nowhere Near the Windows
if(!foreground) {
int pid1, pid2;
if((pid1 = fork()) == -1) {
cerr<<"Cannot fork child process: "<<strerror(errno)<<"\n";
error();
}
if(pid1) {
waitpid(-1, NULL, 0);
return(0);
} else {
if((pid2 = fork()) == -1) {
cerr<<"Cannot fork child process: "<<strerror(errno)<<"\n";
error();
}
if(pid2) {
return(0);
} else {
int nullfd, dupfd;
if((nullfd = open("/dev/null", O_RDWR)) == -1) {
log(LOG_CRIT, "Cannot open /dev/null: %s\n", strerror(errno));
error();
}
for(dupfd = 0; dupfd <= 2; dupfd++) {
if(dup2(nullfd, dupfd) == -1) {
log(LOG_CRIT, "dup2(): %s\n", strerror(errno));
error();
}
}
if(nullfd > 2) close(nullfd);
FILE *f = fopen(pidfile, "w");
if(f == NULL) {
log(LOG_WARNING, "Cannot write pidfile: %s\n", strerror(errno));
} else {
fprintf(f, "%ld\n", (long)getpid());
fclose(f);
}
}
}
}
#endif
for (int i = 0; i < mixer_count; i++) {
if(mixers[i].enabled == false)
continue; // no inputs connected = no need to initialize output
channel_t *channel = &mixers[i].channel;
if(channel->need_mp3)
channel->lame = airlame_init(mixers[i].channel.mode, mixers[i].channel.highpass, mixers[i].channel.lowpass);
for (int k = 0; k < channel->output_count; k++) {
output_t *output = channel->outputs + k;
if(output->type == O_ICECAST) {
shout_setup((icecast_data *)(output->data), channel->mode);
#ifdef PULSE
} else if(output->type == O_PULSE) {
pulse_init();
pulse_setup((pulse_data *)(output->data), channel->mode);
#endif
}
}
}
for (int i = 0; i < device_count; i++) {
device_t* dev = devices + i;
for (int j = 0; j < dev->channel_count; j++) {
channel_t* channel = dev->channels + j;
// If the channel has icecast or MP3 file output, we will attempt to
// initialize a separate LAME context for MP3 encoding.
if(channel->need_mp3)
channel->lame = airlame_init(channel->mode, channel->highpass, channel->lowpass);
for (int k = 0; k < channel->output_count; k++) {
output_t *output = channel->outputs + k;
if(output->type == O_ICECAST) {
shout_setup((icecast_data *)(output->data), channel->mode);
#ifdef PULSE
} else if(output->type == O_PULSE) {
pulse_init();
pulse_setup((pulse_data *)(output->data), channel->mode);
#endif
}
}
}