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Added a few more RTL options

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Added RTL options for Squelch (-L) and Sample 'Volume' Multiplier -V
Hopefully, I didn't break anything else in the process
This commit is contained in:
lwvmobile
2022-02-01 21:37:09 -05:00
committed by GitHub
parent 9ae874449f
commit 7a94be9292
5 changed files with 41 additions and 9 deletions
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11
src/rtl_sdr_fm.cpp
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@@ -50,6 +50,8 @@ static int atan_lut_coef = 8;
#include <netinet/in.h>
#include <arpa/inet.h>
static pthread_t socket_freq;
short int volume_multiplier;
//
struct dongle_state
{
@@ -1057,12 +1059,15 @@ void open_rtlsdr_stream(dsd_opts *opts)
if (opts->audio_in_type == 3) {
dongle.dev_index = opts->rtl_dev_index;
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 Squelch Level to %d\n", demod.squelch_level);
}
if (opts->rtl_gain_value > 0) {
dongle.gain = opts->rtl_gain_value * 10; //multiple by ten to make it consitent with the way rtl_fm really works
}
volume_multiplier = opts->rtl_volume_multiplier;
fprintf(stderr, "Setting RTL Volume Multiplier to %d\n", volume_multiplier);
/* quadruple sample_rate to limit to Δθ to ±π/2 */
demod.rate_in *= demod.post_downsample;
@@ -1142,7 +1147,9 @@ void get_rtlsdr_sample(int16_t *sample)
safe_cond_wait(&output.ready, &output.ready_m);
}
pthread_rwlock_wrlock(&output.rw);
*sample = output.queue.front();
//*sample = output.queue.front();
*sample = output.queue.front() * volume_multiplier; //try multiplying by numbers here for 'gain'
output.queue.pop();
pthread_rwlock_unlock(&output.rw);
}