Detect DigiTech devices on startup. If more than one device is found, ask user which one to use.

TODO

@@ -2,5 +2,4 @@
 -handling presets (saving, exporting to xml patches)
 -buildsystem (install knob.png to share dir, don't use inline knob pixbuf)
 -various fixes to MIDI IN messages handling
--ask user which device to use if more than one DigiTech device is found
 -optimizations

gdigi.c

@@ -1058,6 +1058,8 @@ static gboolean request_who_am_i(unsigned char *device_id, unsigned char *family
         *device_id = data->str[8];
         *family_id = data->str[9];
         *product_id = data->str[10];
+        g_message("I am device id %d family %d product id %d.",
+                   *device_id, *family_id, *product_id);
         g_string_free(data, TRUE);
         return TRUE;
     }
@@ -1122,18 +1124,14 @@ static gint get_digitech_devices(GList **devices)
 {
     gint card_num = -1;
     gint number = 0;
-    snd_card_next(&card_num);
 
-    while (card_num > -1) {
+    while (!snd_card_next(&card_num) && (card_num > -1)) {
         char* name;
         snd_card_get_longname(card_num, &name);
-        gint count = strspn(name,"DigiTech");
-        if (count > 0)
-        {
+        if (strspn(name,"DigiTech") > 0) {
             number++;
             *devices = g_list_append(*devices, GINT_TO_POINTER(card_num));
         }
-        snd_card_next(&card_num);
     }
 
     return number;
@@ -1161,13 +1159,24 @@ int main(int argc, char *argv[]) {
 
     if (device_port == NULL) {
         /* port not given explicitly in commandline - search for devices */
-        GList *devices = NULL;
-        if (get_digitech_devices(&devices) <= 0) {
-            g_message("Couldn't find DigiTech devices!");
+        GList  *devices = NULL;
+        GList  *device = NULL;
+        int     num_devices = 0;
+        int     chosen_device = 0;
+        if ((num_devices = get_digitech_devices(&devices)) <= 0) {
+            g_message("Couldn't find any DigiTech devices!");
             exit(EXIT_FAILURE);
         }
+        if (num_devices > 1) {
+            chosen_device = select_device_dialog(devices);
+            if (chosen_device < 0) {
+                show_error_message(NULL, "No device chosen");
+                exit(EXIT_FAILURE);
+            }
+        }
+        device = g_list_nth(devices, chosen_device);
         device_port = g_strdup_printf("hw:%d,0,0",
-                                      GPOINTER_TO_INT(devices->data));
+                                      GPOINTER_TO_INT(device->data));
         g_list_free(devices);
         g_message("Found device %s", device_port);
     } else {

gui.c

@@ -17,6 +17,7 @@
 #include <gtk/gtk.h>
 #include <glib-object.h>
 #include <string.h>
+#include <alsa/asoundlib.h>
 #include "gdigi.h"
 #include "gui.h"
 #include "effects.h"
@@ -1339,3 +1340,55 @@ gboolean unsupported_device_dialog(Device **device)
     gtk_widget_destroy(dialog);
     return FALSE;
 }
+
+/**
+ *  \param devices List containing the available Digitech devices.
+ *
+ *  Displays dialogbox for choosing a device.
+ *
+ *  \return Index of the selected device or -1 on failure.
+ **/
+gint select_device_dialog (GList *devices)
+{
+
+    GtkWidget *dialog;
+    GtkWidget *label;
+    GtkWidget *combo_box;
+    GtkWidget *vbox;
+    GList     *device;
+
+    dialog = gtk_dialog_new_with_buttons("Select Digitech device",
+                                         NULL, GTK_DIALOG_MODAL,
+                                         GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+                                         GTK_STOCK_OK, GTK_RESPONSE_ACCEPT,
+                                         NULL);
+
+    vbox = gtk_dialog_get_content_area(GTK_DIALOG(dialog));
+
+    label = gtk_label_new("You have multiple Digitech devices, select one.\n");
+    gtk_container_add(GTK_CONTAINER(vbox), label);
+
+    combo_box = gtk_combo_box_text_new();
+    device = g_list_first(devices);
+    do {
+        char *name;
+
+        snd_card_get_longname(GPOINTER_TO_INT(device->data), &name);
+        gtk_combo_box_text_append(GTK_COMBO_BOX_TEXT(combo_box), NULL, name);
+
+    } while ((device = g_list_next(device)));
+
+    gtk_container_add(GTK_CONTAINER(vbox), combo_box);
+
+    gtk_widget_show_all(vbox);
+    if (gtk_dialog_run(GTK_DIALOG(dialog)) == GTK_RESPONSE_ACCEPT) {
+        gint number = gtk_combo_box_get_active(GTK_COMBO_BOX(combo_box));
+        if (number != -1) {
+            gtk_widget_destroy(dialog);
+            return (number);
+        }
+    }
+
+    gtk_widget_destroy(dialog);
+    return  -1;
+}

gui.h

@@ -28,5 +28,6 @@ gboolean apply_current_preset_to_gui(gpointer data);
 void gui_create(Device *device);
 void gui_free();
 gboolean unsupported_device_dialog(Device **device);
+gint select_device_dialog (GList *devices);
 
 #endif /* GDIGI_GUI_H */