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Display -inf when volume/gain controls are at zero/off

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This commit is contained in:
Geoffrey D. Bennett
2023-12-04 13:28:17 +10:30
parent 770ce1cc23
commit 20c4ff5559
4 changed files with 28 additions and 11 deletions
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27
src/widget-gain.c
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@@ -9,6 +9,7 @@ struct gain {
GtkWidget *vbox;
GtkWidget *dial;
GtkWidget *label;
int zero_is_off;
};
static void gain_changed(GtkWidget *widget, struct gain *data) {
@@ -30,21 +31,35 @@ static void gain_updated(
gtk_dial_set_value(GTK_DIAL(data->dial), alsa_value);
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;
if (scale < 1)
snprintf(s, 20, "%.1f", value);
else
snprintf(s, 20, "%.0fdB", value);
if (value > elem->max_dB)
value = elem->max_dB;
else if (value < elem->min_dB)
value = elem->min_dB;
if (data->zero_is_off && alsa_value == 0) {
p += sprintf(p, "−∞");
} else {
if (value < 0)
p += sprintf(p, "−");
if (scale < 1)
p += sprintf(p, "%.1f", fabs(value));
else
p += sprintf(p, "%.0f", fabs(value));
}
if (scale >= 1)
p += sprintf(p, "dB");
gtk_label_set_text(GTK_LABEL(data->label), s);
}
//GList *make_gain_alsa_elem(struct alsa_elem *elem) {
GtkWidget *make_gain_alsa_elem(struct alsa_elem *elem) {
GtkWidget *make_gain_alsa_elem(struct alsa_elem *elem, int zero_is_off) {
struct gain *data = g_malloc(sizeof(struct gain));
data->elem = elem;
data->vbox = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
@@ -62,6 +77,8 @@ GtkWidget *make_gain_alsa_elem(struct alsa_elem *elem) {
data->label = gtk_label_new(NULL);
gtk_widget_set_vexpand(data->dial, TRUE);
data->zero_is_off = zero_is_off;
g_signal_connect(
data->dial, "value-changed", G_CALLBACK(gain_changed), data
);