|
|
@@ -83,6 +83,7 @@ void usage(void)
|
|
|
"\t[-d device_index (default: 0)]\n"
|
|
|
"\t[-g tuner_gain (default: -1dB)]\n"
|
|
|
"\t[-l squelch_level (default: 150)]\n"
|
|
|
+ "\t[-E freq sets lower edge (default: center)]\n"
|
|
|
"\tfilename (a '-' dumps samples to stdout)\n\n"
|
|
|
"Produces signed 16 bit ints, use sox to hear them.\n"
|
|
|
"\trtl_fm ... | play -t raw -r 24k -e signed-integer -b 16 -c 1 -\n\n");
|
|
|
@@ -234,13 +235,13 @@ static void rtlsdr_callback(unsigned char *buf, uint32_t len, void *ctx)
|
|
|
fwrite(fm2->signal2, 2, fm2->signal_len/2, fm2->file);
|
|
|
}
|
|
|
|
|
|
-static void optimal_settings(struct fm_state *fm, int freq, int rate)
|
|
|
+static void optimal_settings(struct fm_state *fm, int freq, int rate, int edge)
|
|
|
{
|
|
|
int r, capture_freq, capture_rate;
|
|
|
fm->downsample = (1000000 / rate) + 1;
|
|
|
fprintf(stderr, "Oversampling by: %ix.\n", fm->downsample);
|
|
|
capture_rate = fm->downsample * rate;
|
|
|
- capture_freq = freq + capture_rate/4;
|
|
|
+ capture_freq = (freq + (edge*rate/2)) + capture_rate/4;
|
|
|
fm->output_scale = (1<<15) / (128 * fm->downsample);
|
|
|
if (fm->output_scale < 1) {
|
|
|
fm->output_scale = 1;
|
|
|
@@ -268,7 +269,7 @@ int main(int argc, char **argv)
|
|
|
char *filename = NULL;
|
|
|
int n_read;
|
|
|
int r, opt;
|
|
|
- int i, gain = -10; // tenths of a dB
|
|
|
+ int i, edge = 0, gain = -10; // tenths of a dB
|
|
|
uint8_t *buffer;
|
|
|
uint32_t dev_index = 0;
|
|
|
uint32_t frequency = 100000000;
|
|
|
@@ -278,7 +279,7 @@ int main(int argc, char **argv)
|
|
|
char vendor[256], product[256], serial[256];
|
|
|
fm.squelch_level = 150;
|
|
|
#ifndef _WIN32
|
|
|
- while ((opt = getopt(argc, argv, "d:f:g:s:b:l:S::")) != -1) {
|
|
|
+ while ((opt = getopt(argc, argv, "d:f:g:s:b:l:E::")) != -1) {
|
|
|
switch (opt) {
|
|
|
case 'd':
|
|
|
dev_index = atoi(optarg);
|
|
|
@@ -295,6 +296,9 @@ int main(int argc, char **argv)
|
|
|
case 's':
|
|
|
samp_rate = (uint32_t)atof(optarg);
|
|
|
break;
|
|
|
+ case 'E':
|
|
|
+ edge = 1;
|
|
|
+ break;
|
|
|
default:
|
|
|
usage();
|
|
|
break;
|
|
|
@@ -352,7 +356,7 @@ int main(int argc, char **argv)
|
|
|
SetConsoleCtrlHandler( (PHANDLER_ROUTINE) sighandler, TRUE );
|
|
|
#endif
|
|
|
|
|
|
- optimal_settings(&fm, frequency, samp_rate);
|
|
|
+ optimal_settings(&fm, frequency, samp_rate, edge);
|
|
|
|
|
|
/* Set the tuner gain */
|
|
|
r = rtlsdr_set_tuner_gain(dev, gain);
|
Kyle Keen