robert/alsa-scarlett-gui
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Add scale to widget-gain.c struct gain

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This commit is contained in:
Geoffrey D. Bennett
2024-01-16 07:00:12 +10:30
parent 3740d7ee2d
commit fcdbc60f16
1 changed files with 8 additions and 9 deletions
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17
src/widget-gain.c
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@@ -10,6 +10,7 @@ struct gain {
GtkWidget *dial;
GtkWidget *label;
int zero_is_off;
float scale;
};
static void gain_changed(GtkWidget *widget, struct gain *data) {
@@ -32,10 +33,7 @@ static void gain_updated(
char s[20];
char *p = s;
float scale = (float)(elem->max_dB - elem->min_dB) /
(elem->max_val - elem->min_val);
float value = (float)alsa_value * scale + elem->min_dB;
float value = (float)alsa_value * data->scale + elem->min_dB;
if (value > elem->max_dB)
value = elem->max_dB;
@@ -47,12 +45,12 @@ static void gain_updated(
} else {
if (value < 0)
p += sprintf(p, "−");
if (scale < 1)
if (data->scale < 1)
p += sprintf(p, "%.1f", fabs(value));
else
p += sprintf(p, "%.0f", fabs(value));
}
if (scale >= 1)
if (data->scale >= 1)
p += sprintf(p, "dB");
gtk_label_set_text(GTK_LABEL(data->label), s);
@@ -67,10 +65,11 @@ GtkWidget *make_gain_alsa_elem(struct alsa_elem *elem, int zero_is_off) {
data->dial = gtk_dial_new_with_range(elem->min_val, elem->max_val, 1);
// calculate 0dB value from min/max dB and min/max value
float scale = (float)(elem->max_dB - elem->min_dB) /
data->scale = (float)(elem->max_dB - elem->min_dB) /
(elem->max_val - elem->min_val);
int zero_db_value = (int)((0 - elem->min_dB) / scale + elem->min_val);
// calculate 0dB value
int zero_db_value = (int)((0 - elem->min_dB) / data->scale + elem->min_val);
gtk_dial_set_zero_db(GTK_DIAL(data->dial), zero_db_value);