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authorKyle Keen <keenerd@gmail.com>2012-12-02 01:34:02 -0500
committerSteve Markgraf <steve@steve-m.de>2012-12-09 17:14:56 +0100
commite4e8ef55fc7d96a5de215512259f9f5751ba6053 (patch)
treefde48d66663c99ed06ab6a81c3973d6b29323ace /src/rtl_fm.c
parent58a53039db2fdbeedc661bccd35476dfa23ff6cf (diff)
rtl_fm: ppm and k/M/G suffixes
Signed-off-by: Steve Markgraf <steve@steve-m.de>
Diffstat (limited to 'src/rtl_fm.c')
-rw-r--r--src/rtl_fm.c45
1 files changed, 35 insertions, 10 deletions
diff --git a/src/rtl_fm.c b/src/rtl_fm.c
index bd7f7ab..b1dc76a 100644
--- a/src/rtl_fm.c
+++ b/src/rtl_fm.c
@@ -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;