radio95/fm95
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compute mono and stereo volumes automatically

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This commit is contained in:
KubaPro010
2025-08-06 19:45:49 +02:00
parent 3ff2ea3a3d
commit 07bf22e3ff
2 changed files with 15 additions and 9 deletions
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22
src/fm95.c
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@@ -18,9 +18,7 @@
#include "../io/audio.h"
#define DEFAULT_MONO_VOLUME 0.45f // 45%
#define DEFAULT_PILOT_VOLUME 0.09f // 9%
#define DEFAULT_STEREO_VOLUME 0.3f // 30%
#define DEFAULT_RDS_VOLUME 0.0475f // 4.75%
#define DEFAULT_RDS_VOLUME_STEP 0.9f // 90%, so RDS2 stream 4 is 90% of stream 3 which is 90% of stream 2, which again is 90% of stream 1...
@@ -111,6 +109,11 @@ bool compare_dvs(const FM95_DeviceNames *a, const FM95_DeviceNames *b) {
strcmp(a->rds, b->rds) == 0;
}
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
}
static void stop(int signum) {
(void)signum;
printf("\nReceived stop signal.\n");
@@ -355,12 +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("volumes", "mono")) {
pconfig->volumes.mono = strtof(value, NULL);
} else if(MATCH("volumes", "pilot")) {
pconfig->volumes.pilot = strtof(value, NULL);
} else if(MATCH("volumes", "stereo")) {
pconfig->volumes.stereo = strtof(value, NULL);
} else if(MATCH("volumes", "rds")) {
pconfig->volumes.rds = strtof(value, NULL);
} else if(MATCH("volumes", "rds_step")) {
@@ -472,14 +471,18 @@ 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");
FM95_Config config = {
.volumes = {
.mono = DEFAULT_MONO_VOLUME,
.pilot = DEFAULT_PILOT_VOLUME,
.stereo = DEFAULT_STEREO_VOLUME,
.rds = DEFAULT_RDS_VOLUME,
.rds_step = DEFAULT_RDS_VOLUME_STEP
},
@@ -544,6 +547,8 @@ int main(int argc, char **argv) {
config.master_volume *= config.audio_deviation/75000.0f;
compute_audio_volumes(&config.volumes, config);
FM95_Runtime runtime;
memset(&runtime, 0, sizeof(runtime));
@@ -571,6 +576,7 @@ 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);
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");