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-rw-r--r--src/rtl_fm_helper.c243
1 files changed, 243 insertions, 0 deletions
diff --git a/src/rtl_fm_helper.c b/src/rtl_fm_helper.c
new file mode 100644
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--- /dev/null
+++ b/src/rtl_fm_helper.c
@@ -0,0 +1,243 @@
+/*
+ * 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");
+ if (fgets(line, sizeof(line), stdin) == NULL)
+ break;
+ 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;
+}