Add input select widget for 4th Gen 2i2 and 4i4

src/iface-mixer.c

@@ -9,6 +9,7 @@
 #include "widget-combo.h"
 #include "widget-dual.h"
 #include "widget-gain.h"
+#include "widget-input-select.h"
 #include "widget-label.h"
 #include "window-helper.h"
 #include "window-levels.h"
@@ -339,6 +340,9 @@ static void create_input_controls(
   if (!input_count)
     return;
 
+  struct alsa_elem *input_select_elem =
+    get_elem_by_name(elems, "Input Select Capture Enum");
+
   GtkWidget *sep = gtk_separator_new(GTK_ORIENTATION_VERTICAL);
   gtk_widget_set_halign(sep, GTK_ALIGN_CENTER);
   gtk_grid_attach(GTK_GRID(top), sep, (*x)++, 0, 1, 3);
@@ -354,9 +358,15 @@ static void create_input_controls(
   gtk_grid_attach(GTK_GRID(top), input_grid, *x, 2, 1, 1);
 
   for (int i = 1; i <= input_count; i++) {
+    GtkWidget *label;
+
+    if (input_select_elem) {
+      label = make_input_select_alsa_elem(input_select_elem, i);
+    } else {
       char s[20];
       snprintf(s, 20, "%d", i);
-    GtkWidget *label = gtk_label_new(s);
+      label = gtk_label_new(s);
+    }
     gtk_grid_attach(GTK_GRID(input_grid), label, i, 0, 1, 1);
   }
 

src/widget-input-select.c

@@ -0,0 +1,77 @@
+// SPDX-FileCopyrightText: 2023-2024 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "stringhelper.h"
+#include "widget-input-select.h"
+
+struct input_select {
+  struct alsa_elem *elem;
+  GtkWidget        *button;
+  int               line_num;
+};
+
+static void input_select_clicked(
+  GtkWidget           *widget,
+  struct input_select *data
+) {
+  int count = alsa_get_item_count(data->elem);
+
+  // select the item that matches the line number that was clicked on
+  for (int i = 0; i < count; i++) {
+    const char *text = alsa_get_item_name(data->elem, i);
+    int a, b;
+    get_two_num_from_string(text, &a, &b);
+
+    if ((b == -1 && a == data->line_num) ||
+        (a <= data->line_num && b >= data->line_num)) {
+      alsa_set_elem_value(data->elem, i);
+      break;
+    }
+  }
+}
+
+static void input_select_updated(
+  struct alsa_elem *elem,
+  void             *private
+) {
+  struct input_select *data = private;
+  int line_num = data->line_num;
+  int is_writable = alsa_get_elem_writable(elem);
+
+  int value = alsa_get_elem_value(elem);
+  const char *text = alsa_get_item_name(elem, value);
+
+  int a, b;
+  get_two_num_from_string(text, &a, &b);
+
+  // set the button active if it's the selected line number
+  // (or in the range)
+  int active = b == -1
+                 ? a == line_num
+                 : a <= line_num && b >= line_num;
+  gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(data->button), active);
+  gtk_widget_set_sensitive(data->button, !active && is_writable);
+}
+
+GtkWidget *make_input_select_alsa_elem(
+  struct alsa_elem *elem,
+  int               line_num
+) {
+  struct input_select *data = malloc(sizeof(struct input_select));
+  data->elem = elem;
+  data->button = gtk_toggle_button_new();
+  data->line_num = line_num;
+
+  char s[20];
+  snprintf(s, 20, "%d", line_num);
+  gtk_button_set_label(GTK_BUTTON(data->button), s);
+
+  g_signal_connect(
+    data->button, "clicked", G_CALLBACK(input_select_clicked), data
+  );
+  alsa_elem_add_callback(elem, input_select_updated, data);
+
+  input_select_updated(elem, data);
+
+  return data->button;
+}

src/widget-input-select.h

@@ -0,0 +1,13 @@
+// SPDX-FileCopyrightText: 2023-2024 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "alsa.h"
+
+GtkWidget *make_input_select_alsa_elem(
+  struct alsa_elem *alsa_elem,
+  int               line_num
+);