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/*
* Copyright (C) 2018 Konsulko Group
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include <glib.h>
#include "rtl_fm.h"
#include "radio_output.h"
#ifdef DEBUG
#define LOG_FILE "/tmp/helper.log"
FILE *_log;
#define LOG(...) \
do { \
if(!_log) _log = fopen(LOG_FILE, "w"); \
fprintf(_log, __VA_ARGS__); \
fflush(_log); \
} while(0)
#else
#define LOG(...) do { } while(0)
#endif
// Structure to describe FM band plans, all values in Hz.
typedef struct {
const char *name;
uint32_t min;
uint32_t max;
uint32_t step;
} fm_band_plan_t;
static fm_band_plan_t known_fm_band_plans[5] = {
{ .name = "US", .min = 87900000, .max = 107900000, .step = 200000 },
{ .name = "JP", .min = 76000000, .max = 95000000, .step = 100000 },
{ .name = "EU", .min = 87500000, .max = 108000000, .step = 50000 },
{ .name = "ITU-1", .min = 87500000, .max = 108000000, .step = 50000 },
{ .name = "ITU-2", .min = 87900000, .max = 107900000, .step = 50000 }
};
static unsigned int bandplan;
static char line[64];
static void rtl_output_callback(int16_t *result, int result_len, void *ctx)
{
radio_output_write((char*) result, result_len * 2);
}
static void rtl_freq_callback(uint32_t freq, void *ctx)
{
// Note, need to flush output to ensure parent sees it
printf("F=%u\n", freq);
fflush(stdout);
LOG("F=%u\n", freq);
}
static void rtl_scan_callback(uint32_t freq, void *ctx)
{
// Note, need to flush output to ensure parent sees it
printf("S=%u\n", freq);
fflush(stdout);
LOG("S=%u\n", freq);
}
static void read_config(void)
{
GKeyFile* conf_file;
int conf_file_present = 0;
char *value_str;
// Load settings from configuration file if it exists
conf_file = g_key_file_new();
if(conf_file &&
g_key_file_load_from_dirs(conf_file,
"AGL.conf",
(const gchar**) g_get_system_config_dirs(),
NULL,
G_KEY_FILE_KEEP_COMMENTS,
NULL) == TRUE) {
conf_file_present = 1;
// Set band plan if it is specified
value_str = g_key_file_get_string(conf_file,
"radio",
"fmbandplan",
NULL);
if(value_str) {
unsigned int i;
for(i = 0;
i < sizeof(known_fm_band_plans) / sizeof(fm_band_plan_t);
i++) {
if(!strcasecmp(value_str, known_fm_band_plans[i].name)) {
bandplan = i;
break;
}
}
}
}
fprintf(stderr, "Using FM Bandplan: %s\n", known_fm_band_plans[bandplan].name);
if(conf_file_present) {
GError *error = NULL;
int n;
// Allow over-riding scanning parameters just in case a demo
// setup needs to do so to work reliably.
n = g_key_file_get_integer(conf_file,
"radio",
"scan_squelch_level",
&error);
if(!error) {
fprintf(stderr, "Scanning squelch level set to %d\n", n);
rtl_fm_scan_set_squelch_level(n);
}
error = NULL;
n = g_key_file_get_integer(conf_file,
"radio",
"scan_squelch_limit",
&error);
if(!error) {
fprintf(stderr, "Scanning squelch limit set to %d\n", n);
rtl_fm_scan_set_squelch_limit(n);
}
g_key_file_free(conf_file);
}
}
int main(int argc, char *argv[])
{
int rc;
bool detect = false;
bool done = false;
bool started = false;
uint32_t frequency;
LOG("started\n");
read_config();
frequency = known_fm_band_plans[bandplan].min;
if(argc == 2 && strcmp(argv[1], "--detect") == 0) {
detect = true;
}
rc = rtl_fm_init(frequency, 200000, 48000, rtl_output_callback, NULL);
if(rc < 0) {
fprintf(stderr, "No RTL USB adapter?\n");
exit(1);
}
if(detect) {
rtl_fm_cleanup();
exit(0);
}
rtl_fm_set_freq_callback(rtl_freq_callback, NULL);
while(!done) {
LOG("Reading command\n");
fgets(line, sizeof(line), stdin);
if(line[0] == '\0' || line[0] == '\n')
continue;
if(strcmp(line, "START\n") == 0) {
LOG("START received\n");
if(!started) {
LOG("Starting\n");
radio_output_start();
rtl_fm_start();
started = true;
}
} else if(strcmp(line, "STOP\n") == 0) {
LOG("STOP received\n");
if(started) {
LOG("Stopping\n");
radio_output_stop();
rtl_fm_stop();
started = false;
}
} else if(strncmp(line, "F=", 2) == 0) {
uint32_t n;
if(sscanf(line, "F=%u\n", &n) == 1) {
LOG("F=%d received\n", n);
rtl_fm_scan_stop();
rtl_fm_set_freq(n);
}
} else if(strcmp(line, "S=UP\n") == 0) {
LOG("S=UP received\n");
if(!started)
continue;
LOG("Calling rtl_fm_scan_start\n");
rtl_fm_scan_start(0,
rtl_scan_callback,
NULL,
known_fm_band_plans[bandplan].step,
known_fm_band_plans[bandplan].min,
known_fm_band_plans[bandplan].max);
} else if(strcmp(line, "S=DOWN\n") == 0) {
LOG("S=DOWN received\n");
if(!started)
continue;
LOG("Calling rtl_fm_scan_start\n");
rtl_fm_scan_start(1,
rtl_scan_callback,
NULL,
known_fm_band_plans[bandplan].step,
known_fm_band_plans[bandplan].min,
known_fm_band_plans[bandplan].max);
} else if(strcmp(line, "S=STOP\n") == 0) {
LOG("S=STOP received\n");
if(started) {
LOG("Calling rtl_fm_scan_stop\n");
rtl_fm_scan_stop();
}
} else if(line[0] == 'q' || line[0] == 'Q')
break;
}
if(started) {
radio_output_stop();
rtl_fm_stop();
}
rtl_fm_cleanup();
LOG("done");
return 0;
}
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