sdr
/
rtl-sdr
7
1
Fork 5
Code Issues Pull Requests Projects Releases Wiki Activity

rtl_fm: ppm and k/M/G suffixes 

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Kyle Keen 2012-12-02 01:34:02 -05:00 committed by Steve Markgraf
parent 58a53039db
commit e4e8ef55fc
1 changed files with 35 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
src/rtl_fm.c
View File

@ -119,15 +119,16 @@ void usage(void)
"Use:\trtl_fm -f freq [-options] filename\n"
"\t-f frequency_to_tune_to [Hz]\n"
"\t (use multiple -f for scanning)\n"
"\t[-s samplerate (default: 24000 Hz)]\n"
"\t[-s samplerate (default: 24k Hz)]\n"
"\t[-d device_index (default: 0)]\n"
"\t[-g tuner_gain (default: automatic)]\n"
"\t[-l squelch_level (default: 150)]\n"
"\t[-l squelch_level (default: 0/off)]\n"
"\t[-o oversampling (default: 1)]\n"
"\t[-p ppm_error (default: 0)]\n"
"\t[-E sets lower edge tuning (default: center)]\n"
"\t[-N enables NBFM mode (default: on)]\n"
"\t[-W enables WBFM mode (default: off)]\n"
"\t (-N -s 170e3 -o 4 -A -r 32e3 -l 0 -D)\n"
"\t (-N -s 170k -o 4 -A -r 32k -l 0 -D)\n"
"\tfilename (a '-' dumps samples to stdout)\n\n"
"Experimental options:\n"
"\t[-r output rate (default: same as -s)]\n"
@ -144,7 +145,7 @@ void usage(void)
"Produces signed 16 bit ints, use Sox or aplay to hear them.\n"
"\trtl_fm ... - | play -t raw -r 24k -e signed-integer -b 16 -c 1 -V1 -\n"
"\t | aplay -r 24k -f S16_LE -t raw -c 1\n"
"\t -s 22050 - | multimon -t raw /dev/stdin\n\n");
"\t -s 22.5k - | multimon -t raw /dev/stdin\n\n");
exit(1);
}
@ -567,6 +568,26 @@ static void *demod_thread_fn(void *arg)
return 0;
}
int atofs(char* f)
/* standard suffixes */
{
char* chop;
double suff = 1.0;
chop = strndup(f, strlen(f)-1);
switch (f[strlen(f)-1]) {
case 'G':
suff *= 1e3;
case 'M':
suff *= 1e3;
case 'k':
suff *= 1e3;
suff *= atof(chop);}
free(chop);
if (suff != 1.0) {
return (int)suff;}
return (int)atof(f);
}
int main(int argc, char **argv)
{
#ifndef _WIN32
@ -579,10 +600,11 @@ int main(int argc, char **argv)
uint8_t *buffer;
uint32_t dev_index = 0;
int device_count;
int ppm_error = 0;
char vendor[256], product[256], serial[256];
fm.freqs[0] = 100000000;
fm.sample_rate = DEFAULT_SAMPLE_RATE;
fm.squelch_level = 150;
fm.squelch_level = 0;
fm.term_squelch_hits = 0;
fm.freq_len = 0;
fm.edge = 0;
@ -595,13 +617,13 @@ int main(int argc, char **argv)
fm.mode_demod = &fm_demod;
sem_init(&data_ready, 0, 0);
while ((opt = getopt(argc, argv, "d:f:g:s:b:l:o:t:r:EFANWMULRD")) != -1) {
while ((opt = getopt(argc, argv, "d:f:g:s:b:l:o:t:r:p:EFANWMULRD")) != -1) {
switch (opt) {
case 'd':
dev_index = atoi(optarg);
break;
case 'f':
fm.freqs[fm.freq_len] = (uint32_t)atof(optarg);
fm.freqs[fm.freq_len] = (uint32_t)atofs(optarg);
fm.freq_len++;
break;
case 'g':
@ -611,10 +633,10 @@ int main(int argc, char **argv)
fm.squelch_level = (int)atof(optarg);
break;
case 's':
fm.sample_rate = (uint32_t)atof(optarg);
fm.sample_rate = (uint32_t)atofs(optarg);
break;
case 'r':
fm.output_rate = (int)atof(optarg);
fm.output_rate = (int)atofs(optarg);
break;
case 'o':
fm.post_downsample = (int)atof(optarg);
@ -624,6 +646,8 @@ int main(int argc, char **argv)
case 't':
fm.term_squelch_hits = (int)atof(optarg);
break;
case 'p':
ppm_error = atoi(optarg);
case 'E':
fm.edge = 1;
break;
@ -712,7 +736,7 @@ int main(int argc, char **argv)
/* WBFM is special */
if (wb_mode) {
fm.freqs[0] += 15000;
fm.freqs[0] += 16000;
}
if (fm.deemph) {
@ -736,6 +760,7 @@ int main(int argc, char **argv)
} else {
fprintf(stderr, "Tuner gain set to %0.2f dB.\n", gain/10.0);
}
r = rtlsdr_set_freq_correction(dev, ppm_error);
if (strcmp(filename, "-") == 0) { /* Write samples to stdout */
fm.file = stdout;