Change initial volume to be in % in place of absolute values

Signed-off-by: Fulup Ar Foll <fulup@iot.bzh>

1 files changed, 12 insertions, 1 deletions

diff --git a/alsa-binding/Alsa-AddCtl.c b/alsa-binding/Alsa-AddCtl.c
index 82a6dac..a1da706 100644
--- a/alsa-binding/Alsa-AddCtl.c
+++ b/alsa-binding/Alsa-AddCtl.c
@@ -25,6 +25,7 @@
 #include <alsa/sound/tlv.h>
 #include <systemd/sd-event.h>
 #include <sys/ioctl.h>
+#include <math.h>
 
 #include "Alsa-ApiHat.h"
 
@@ -299,7 +300,17 @@ UpdateDefaultVal:
     // Set Value to default
     snd_ctl_elem_value_alloca(&elemValue);
     for (int idx = 0; idx < snd_ctl_elem_info_get_count(elemInfo); idx++) {
-        snd_ctl_elem_value_set_integer(elemValue, idx, ctlValue);
+        
+        // initial default value should be a percentage for integer
+        if (snd_ctl_elem_info_get_type(elemInfo) == SND_CTL_ELEM_TYPE_INTEGER) {
+            double min = (double)snd_ctl_elem_info_get_min(elemInfo);
+            double max = (double)snd_ctl_elem_info_get_max(elemInfo);
+            double normValue = ceil((ctlValue) * (max - min) * 0.01 + min);
+            snd_ctl_elem_value_set_integer(elemValue, idx, (int)normValue);
+
+        } else {    
+            snd_ctl_elem_value_set_integer(elemValue, idx, ctlValue);
+        }
     }
 
     // write default values in newly created control