radio95/fm95
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makeup gain

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This commit is contained in:
kuba
2026-04-28 20:36:33 +02:00
parent f628fc25b6
commit 00219d862a
1 changed files with 18 additions and 16 deletions
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src/fm95.c
+18 -16
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@@ -25,8 +25,10 @@
static volatile sig_atomic_t to_run = 1; static volatile sig_atomic_t to_run = 1;
static volatile sig_atomic_t to_reload = 0; static volatile sig_atomic_t to_reload = 0;
static inline float soft_clip(float x) { static inline float soft_clip(float x) { return tanhf(x); }
return tanhf(x);
static inline float soft_clip_drive(float x, float drive) {
return tanhf(x * drive) / tanhf(drive);
} }
typedef struct { typedef struct {
@@ -39,6 +41,8 @@ typedef struct {
float pilot; float pilot;
float rds; float rds;
float rds_step; float rds_step;
float drive;
float makeup;
} FM95_Volumes; } FM95_Volumes;
typedef struct { typedef struct {
FM95_Options options; FM95_Options options;
@@ -225,8 +229,8 @@ int run_fm95(const FM95_Config config, FM95_Runtime* runtime) {
mod_r = apply_preemphasis(&runtime->preemp_r, mod_r); mod_r = apply_preemphasis(&runtime->preemp_r, mod_r);
} }
mod_l = soft_clip(mod_l); mod_l = soft_clip_drive(mod_l, config.volumes.drive) * config.volumes.makeup;
mod_r = soft_clip(mod_r); mod_r = soft_clip_drive(mod_r, config.volumes.drive) * config.volumes.makeup;
mpx = stereo_encode(&runtime->stencode, config.stereo, mod_l, mod_r, &audio); mpx = stereo_encode(&runtime->stencode, config.stereo, mod_l, mod_r, &audio);
@@ -358,17 +362,13 @@ static int config_handler(void* user, const char* section, const char* name, con
pconfig->lpf_cutoff = (pconfig->sample_rate * 0.5); pconfig->lpf_cutoff = (pconfig->sample_rate * 0.5);
fprintf(stderr, "LPF cutoff over niquist, limiting.\n"); fprintf(stderr, "LPF cutoff over niquist, limiting.\n");
} }
} else if(MATCH("advanced", "headroom")) { } else if(MATCH("advanced", "headroom")) pconfig->volumes.headroom = strtof(value, NULL);
pconfig->volumes.headroom = strtof(value, NULL); else if(MATCH("advanced", "drive")) pconfig->volumes.drive = strtof(value, NULL);
} else if(MATCH("volumes", "pilot")) { else if(MATCH("advanced", "makeup")) pconfig->volumes.makeup = strtof(value, NULL);
pconfig->volumes.pilot = strtof(value, NULL); else if(MATCH("volumes", "pilot")) pconfig->volumes.pilot = strtof(value, NULL);
} else if(MATCH("volumes", "rds")) { else if(MATCH("volumes", "rds")) pconfig->volumes.rds = strtof(value, NULL);
pconfig->volumes.rds = strtof(value, NULL); else if(MATCH("volumes", "rds_step")) pconfig->volumes.rds_step = strtof(value, NULL);
} else if(MATCH("volumes", "rds_step")) { else return 0; // Unknown section/name
pconfig->volumes.rds_step = strtof(value, NULL);
} else {
return 0; // Unknown section/name
}
return 1; return 1;
} }
@@ -498,7 +498,9 @@ int main(int argc, char **argv) {
.pilot = DEFAULT_PILOT_VOLUME, .pilot = DEFAULT_PILOT_VOLUME,
.rds = DEFAULT_RDS_VOLUME, .rds = DEFAULT_RDS_VOLUME,
.rds_step = DEFAULT_RDS_VOLUME_STEP, .rds_step = DEFAULT_RDS_VOLUME_STEP,
.headroom = 0.05f .headroom = 0.05f,
.drive = 1.0f,
.makeup = 1.0f
}, },
.stereo = 1, .stereo = 1,
.stereo_ssb = 0, .stereo_ssb = 0,