radio95/fm95
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damn it

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This commit is contained in:
KubaPro010
2025-03-08 21:23:23 +01:00
parent 21b009f68b
commit 2b720500de
3 changed files with 3 additions and 43 deletions
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20
lib/filters.c
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@@ -31,26 +31,6 @@ float apply_biquad(BiquadFilter* filter, float input) {
return out;
}
void init_upsampler(Upsampler* up, int ratio, float sample_rate) {
up->i = 0;
up->ratio = ratio;
init_lpf(&up->lpf, sample_rate*ratio, 0.70710678f, sample_rate);
}
float upsample(Upsampler* up, float sample) {
float output = 0.0f;
if (up->i == 0) {
output = sample;
}
output = apply_biquad(&up->lpf, output);
up->i++;
if(up->i >= up->ratio) up->i = 0;
return output;
}
float hard_clip(float sample, float threshold) {
if (sample > threshold) {

9
lib/filters.h
View File

@@ -23,15 +23,6 @@ typedef struct {
void init_lpf(BiquadFilter* filter, float cutoffFreq, float qFactor, float sampleRate);
float apply_biquad(BiquadFilter* filter, float input);
typedef struct
{
int i;
int ratio;
BiquadFilter lpf;
} Upsampler;
void init_upsampler(Upsampler* up, int ratio, float sample_rate);
float upsample(Upsampler *up, float sample);
float hard_clip(float sample, float threshold);
float voltage_db_to_voltage(float db);
float power_db_to_voltage(float db);

17
src/fm95.c
View File

@@ -21,7 +21,6 @@
#include "../lib/filters.h"
#include "../lib/fm_modulator.h"
#define INPUT_SAMPLE_RATE 32000 // make sure that the output is a multiple of this
#define SAMPLE_RATE 192000
#define INPUT_DEVICE "FM_Audio.monitor"
@@ -239,12 +238,6 @@ int main(int argc, char **argv) {
.channels = 1,
.rate = SAMPLE_RATE
};
pa_sample_spec main_input_format = {
.format = PA_SAMPLE_FLOAT32NE,
.channels = 2,
.rate = INPUT_SAMPLE_RATE
};
pa_buffer_attr input_buffer_atr = {
.maxlength = buffer_maxlength,
@@ -266,7 +259,7 @@ int main(int argc, char **argv) {
PA_STREAM_RECORD,
audio_input_device,
"Main Audio Input",
&main_input_format,
&stereo_format,
NULL,
&input_buffer_atr,
&opentime_pulse_error
@@ -382,10 +375,6 @@ int main(int argc, char **argv) {
BiquadFilter lpf_l, lpf_r;
init_lpf(&lpf_l, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
init_lpf(&lpf_r, LPF_CUTOFF, 0.70710678f, SAMPLE_RATE);
Upsampler upsampler_l, upsampler_r;
init_upsampler(&upsampler_l, SAMPLE_RATE/INPUT_SAMPLE_RATE, SAMPLE_RATE);
init_upsampler(&upsampler_r, SAMPLE_RATE/INPUT_SAMPLE_RATE, SAMPLE_RATE);
// #endregion
signal(SIGINT, stop);
@@ -421,8 +410,8 @@ int main(int argc, char **argv) {
}
for (int i = 0; i < BUFFER_SIZE; i++) {
float l_in = upsample(&upsampler_l, left[i]);
float r_in = upsample(&upsampler_r, right[i]);
float l_in = left[i];
float r_in = right[i];
float current_mpx_in = mpx_in[i];
float current_sca_in = sca_in[i];