Initial revision

src/window-levels.c

@@ -0,0 +1,112 @@
+// SPDX-FileCopyrightText: 2022 Geoffrey D. Bennett <g@b4.vu>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include <gtk/gtk.h>
+
+#include "gtkdial.h"
+#include "gtkhelper.h"
+#include "stringhelper.h"
+#include "widget-gain.h"
+#include "window-levels.h"
+
+static int update_levels_controls(void *user_data) {
+  struct alsa_card *card = user_data;
+
+  struct alsa_elem *level_meter_elem = card->level_meter_elem;
+
+  int *values = alsa_get_elem_int_values(level_meter_elem);
+
+  int meter_num = 0;
+
+  // go through the port categories
+  for (int i = 0; i < PC_COUNT; i++) {
+
+    // go through the ports in that category
+    for (int j = 0; j < card->routing_out_count[i]; j++) {
+      GtkWidget *meter = card->meters[meter_num];
+      gtk_dial_set_value(GTK_DIAL(meter), values[meter_num]);
+      meter_num++;
+    }
+  }
+
+  free(values);
+
+  return 1;
+}
+
+static GtkWidget *add_count_label(GtkGrid *grid, int count) {
+  char s[20];
+
+  sprintf(s, "%d", count + 1);
+  GtkWidget *l = gtk_label_new(s);
+
+  gtk_grid_attach(grid, l, count + 1, 0, 1, 1);
+
+  return l;
+}
+
+static struct alsa_elem *get_level_meter_elem(struct alsa_card *card) {
+  GArray *elems = card->elems;
+
+  for (int i = 0; i < elems->len; i++) {
+    struct alsa_elem *elem = &g_array_index(elems, struct alsa_elem, i);
+
+    if (!elem->card)
+      continue;
+
+    if (strcmp(elem->name, "Level Meter") == 0)
+      return elem;
+  }
+
+  return NULL;
+}
+
+GtkWidget *create_levels_controls(struct alsa_card *card) {
+  GtkWidget *levels_top = gtk_grid_new();
+  GtkGrid *grid = GTK_GRID(levels_top);
+
+  gtk_widget_set_margin(GTK_WIDGET(grid), 5);
+
+  GtkWidget *count_labels[MAX_MUX_IN] = { NULL };
+
+  int meter_num = 0;
+
+  card->level_meter_elem = get_level_meter_elem(card);
+  if (!card->level_meter_elem) {
+    printf("Level Meter control not found\n");
+    return NULL;
+  }
+
+  // go through the port categories
+  for (int i = 0; i < PC_COUNT; i++) {
+    GtkWidget *l = gtk_label_new(port_category_names[i]);
+    gtk_widget_set_halign(l, GTK_ALIGN_END);
+
+    // add the label
+    gtk_grid_attach(GTK_GRID(grid), l, 0, i + 1, 1, 1);
+
+    // go through the ports in that category
+    for (int j = 0; j < card->routing_out_count[i]; j++) {
+
+      // add a count label if that hasn't already been done
+      if (!count_labels[j])
+        count_labels[j] = add_count_label(grid, j);
+
+      // create the meter widget and attach to the grid
+      GtkWidget *meter = gtk_dial_new_with_range(0, 4096, 1);
+      card->meters[meter_num++] = meter;
+      gtk_grid_attach(GTK_GRID(grid), meter, j + 1, i + 1, 1, 1);
+    }
+  }
+
+  int elem_count = card->level_meter_elem->count;
+  if (meter_num != elem_count) {
+    printf("meter_num is %d but elem count is %d\n", meter_num, elem_count);
+    return NULL;
+  }
+  card->level_meter_elem->count = elem_count;
+
+  card->meter_gsource_timer = g_timeout_add(50, update_levels_controls, card);
+
+  return levels_top;
+}