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Add RTL VFO bandwidth options

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Add RTL VFO bandwidth options
-Y 8 for 8 kHz VFO
-Y 24 for 24 kHz VFO

Should work at any interval where 48 cleanly divides by a number
This commit is contained in:
lwvmobile
2022-02-05 13:30:44 -05:00
committed by GitHub
parent 6573521363
commit b66cac75d2
3 changed files with 35 additions and 10 deletions
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32
src/rtl_sdr_fm.cpp
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@@ -31,7 +31,7 @@
#include <rtl-sdr.h>
#include "dsd.h"
#define DEFAULT_SAMPLE_RATE 48000 //48000
//#define DEFAULT_SAMPLE_RATE 48000 //moved to opts->rtl_bandwidth
#define DEFAULT_BUF_LENGTH (1 * 16384)
#define MAXIMUM_OVERSAMPLE 16 //16
#define MAXIMUM_BUF_LENGTH (MAXIMUM_OVERSAMPLE * DEFAULT_BUF_LENGTH)
@@ -51,6 +51,10 @@ static int atan_lut_coef = 8;
#include <arpa/inet.h>
static pthread_t socket_freq;
int rtl_bandwidth;
int bandwidth_multiplier;
int bandwidth_divisor = 48000; //divide bandwidth by this to get multiplier for the for j loop to queue.push
short int volume_multiplier;
short int port;
//
@@ -582,7 +586,8 @@ static void *demod_thread_fn(void *arg)
pthread_rwlock_wrlock(&o->rw);
for (int i = 0; i < d->result_len; i++)
{
o->queue.push(d->result[i]);
for (int j=0; j < bandwidth_multiplier; j++){
o->queue.push(d->result[i]);}
}
pthread_rwlock_unlock(&o->rw);
safe_cond_signal(&o->ready, &o->ready_m);
@@ -802,7 +807,8 @@ static void *controller_thread_fn(void *arg)
void dongle_init(struct dongle_state *s)
{
s->rate = DEFAULT_SAMPLE_RATE;
//s->rate = DEFAULT_SAMPLE_RATE;
s->rate = rtl_bandwidth;
s->gain = AUTO_GAIN; // tenths of a dB
s->mute = 0;
s->direct_sampling = 0;
@@ -813,8 +819,10 @@ void dongle_init(struct dongle_state *s)
void demod_init(struct demod_state *s)
{
s->rate_in = DEFAULT_SAMPLE_RATE;
s->rate_out = DEFAULT_SAMPLE_RATE;
//s->rate_in = DEFAULT_SAMPLE_RATE;
//s->rate_out = DEFAULT_SAMPLE_RATE;
s->rate_in = rtl_bandwidth;
s->rate_out = rtl_bandwidth;
s->squelch_level = 0;
s->conseq_squelch = 10;
s->terminate_on_squelch = 0;
@@ -848,7 +856,8 @@ void demod_cleanup(struct demod_state *s)
void output_init(struct output_state *s)
{
s->rate = DEFAULT_SAMPLE_RATE;
//s->rate = DEFAULT_SAMPLE_RATE;
s->rate = rtl_bandwidth;
pthread_rwlock_init(&s->rw, NULL);
pthread_cond_init(&s->ready, NULL);
pthread_mutex_init(&s->ready_m, NULL);
@@ -1043,7 +1052,10 @@ void open_rtlsdr_stream(dsd_opts *opts)
{
struct sigaction sigact;
int r;
rtl_bandwidth = opts->rtl_bandwidth * 1000; //multiple by 1000 to get rate
//rtl_bandwidth = 48000;
bandwidth_multiplier = (bandwidth_divisor / rtl_bandwidth); //find multiple with no remainder if oddball number entered
//bandwidth_multiplier = 1;
dongle_init(&dongle);
demod_init(&demod);
output_init(&output);
@@ -1060,7 +1072,13 @@ void open_rtlsdr_stream(dsd_opts *opts)
if (opts->audio_in_type == 3) {
dongle.dev_index = opts->rtl_dev_index;
//rtl_bandwidth = opts->rtl_bandwidth * 1000; //multiple by 1000 to get rate
//rtl_bandwidth = 48000;
//bandwidth_multiplier = rtl_bandwidth / bandwidth_divisor; //find multiple with no remainder if oddball number entered
//bandwidth_multiplier = 1;
demod.squelch_level = opts->rtl_squelch_level; //adding user definable squelch level to prevent false positives on account of noise in NXDN etc
fprintf(stderr, "Setting RTL VFO Bandwidth to %d Hz\n", rtl_bandwidth);
fprintf(stderr, "Setting RTL Sample Multiplier to %d\n", bandwidth_multiplier);
fprintf(stderr, "Setting RTL Squelch Level to %d\n", demod.squelch_level);
port = opts->rtl_udp_port;
}