radio95/fm95
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Code Issues Activity

add headroom option

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This commit is contained in:
KubaPro010
2025-08-06 19:56:16 +02:00
parent 07bf22e3ff
commit 7350cbcf1e
5 changed files with 23 additions and 22 deletions
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23
src/fm95.c
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@@ -34,9 +34,9 @@ typedef struct
} FM95_Options;
typedef struct
{
float mono;
float audio;
float headroom;
float pilot;
float stereo;
float rds;
float rds_step;
} FM95_Volumes;
@@ -111,7 +111,7 @@ bool compare_dvs(const FM95_DeviceNames *a, const FM95_DeviceNames *b) {
float calculate_sharedaudio_volume(const FM95_Volumes volumes, const int rds_streams) {
float rds_volume = volumes.rds * powf(volumes.rds_step, rds_streams);
return 1.0f - rds_volume - volumes.pilot - 0.1f; // Give 10% of headroom, for MPX maybe
return 1.0f - rds_volume - volumes.pilot - volumes.headroom;
}
static void stop(int signum) {
@@ -358,6 +358,8 @@ static int config_handler(void* user, const char* section, const char* name, con
pconfig->lpf_cutoff = (pconfig->sample_rate * 0.5);
fprintf(stderr, "LPF cutoff over niquist, limiting.\n");
}
} else if(MATCH("advanced", "headroom")) {
pconfig->volumes.headroom = strtof(value, NULL);
} else if(MATCH("volumes", "pilot")) {
pconfig->volumes.pilot = strtof(value, NULL);
} else if(MATCH("volumes", "rds")) {
@@ -459,7 +461,7 @@ void init_runtime(FM95_Runtime* runtime, const FM95_Config config) {
if(config.tilt != 0) tilt_init(&runtime->tilter, (float)config.tilt / 127.0f);
init_stereo_encoder(&runtime->stencode, 4.0f, &runtime->osc, config.volumes.mono, config.volumes.pilot, config.volumes.stereo);
init_stereo_encoder(&runtime->stencode, 4.0f, &runtime->osc, config.volumes.audio, config.volumes.pilot);
if(config.agc_max != 0.0) {
last_gain = 1.0f;
@@ -471,12 +473,6 @@ void init_runtime(FM95_Runtime* runtime, const FM95_Config config) {
if(config.options.rds_on) memset(runtime->rds_in, 0, sizeof(float) * BUFFER_SIZE * config.rds_streams);
}
void compute_audio_volumes(FM95_Volumes* volumes, const FM95_Config config) {
float shared = calculate_sharedaudio_volume(*volumes, config.rds_streams);
if(config.stereo != 0) volumes->mono = volumes->stereo = (shared / 2.0f);
else volumes->mono = shared;
}
int main(int argc, char **argv) {
printf("fm95 (an FM Processor by radio95) version 2.2\n");
@@ -484,7 +480,8 @@ int main(int argc, char **argv) {
.volumes = {
.pilot = DEFAULT_PILOT_VOLUME,
.rds = DEFAULT_RDS_VOLUME,
.rds_step = DEFAULT_RDS_VOLUME_STEP
.rds_step = DEFAULT_RDS_VOLUME_STEP,
.headroom = 0.05f
},
.stereo = 1,
@@ -547,7 +544,7 @@ int main(int argc, char **argv) {
config.master_volume *= config.audio_deviation/75000.0f;
compute_audio_volumes(&config.volumes, config);
config.volumes.audio = calculate_sharedaudio_volume(config.volumes, config.rds_streams);
FM95_Runtime runtime;
memset(&runtime, 0, sizeof(runtime));
@@ -576,7 +573,7 @@ int main(int argc, char **argv) {
printf("Could not parse the config file. (error code as return code)\n");
return err;
}
compute_audio_volumes(&config.volumes, config);
config.volumes.audio = calculate_sharedaudio_volume(config.volumes, config.rds_streams);
if(!compare_dvs(&dv_names, &old_dv_names)) printf("Warning! Audio Device name changes are not reloaded, please restart for that to take effect.\n");
old_dv_names = dv_names;
if(config.rds_streams != old_streams) printf("Warning! change of rds_streams requires a restart, not a reload.\n");