check if is ofdm mode

also returning execution status as int

Author: DJ2LS

src/freedv_api.c

@@ -1382,13 +1382,16 @@ void freedv_get_fsk_S_and_N               (struct freedv *f, float *S, float *N)
   Set fmin / fmax for ofdm modem
 
 \*---------------------------------------------------------------------------*/
-void freedv_set_fmin_fmax(struct freedv *freedv, float val_fmin, float val_fmax) {
-    freedv->ofdm->fmin = val_fmin;
-    freedv->ofdm->fmax = val_fmax;
-}
-
+int freedv_set_fmin_fmax(struct freedv *freedv, float val_fmin, float val_fmax) {
 
-  
+    if (is_ofdm_data_mode(freedv)) {
+        freedv->ofdm->fmin = val_fmin;
+        freedv->ofdm->fmax = val_fmax;
+        return 1;
+    } else {
+        return 0;
+    }
+}
 
 
 int freedv_get_n_max_speech_samples(struct freedv *f) {

src/freedv_api.h

@@ -240,7 +240,7 @@ void freedv_set_phase_est_bandwidth_mode(struct freedv *f, int val);
 void freedv_set_eq                      (struct freedv *f, int val);
 void freedv_set_frames_per_burst        (struct freedv *f, int framesperburst);
 void freedv_passthrough_gain            (struct freedv *f, float g);
-void freedv_set_fmin_fmax               (struct freedv *freedv, float val_fmin, float val_fmax);
+int freedv_set_fmin_fmax                (struct freedv *freedv, float val_fmin, float val_fmax);
 
 // Get parameters -------------------------------------------------------------------------