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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2
README.md
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@@ -12,7 +12,7 @@ FM95 is a audio processor for FM, it does:
Supports these inputs:
- Audio (via Pulse)
- MPX (via Pulse, basically passthrough, i don't recommend this unless you have something else than rds or sca to modulate, you could run chimer95 via here)
- MPX (via Pulse, basically passthrough, i don't recommend this unless you have something else than rds or sca to modulate, you could run chimer95 via here, also you have 10% allowed here to be guarenteed with no clipping)
- RDS (via Pulse, expects unmodulated RDS, rds95 is recommended here, in modulation this is quadrature to the pilot, number of channels is specified by the argument, each of the channels (max 4) go on these freqs: 57, 66.5, 71.25, 76)
and one output:

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");