AGS: Set up digi driver detection

engines/ags/lib/allegro/base.h

@@ -25,6 +25,7 @@
 
 #include "common/scummsys.h"
 #include "common/algorithm.h"
+#include "common/endian.h"
 
 namespace AGS3 {
 
@@ -55,6 +56,8 @@ struct _DRIVER_INFO {
 
 #define AL_FUNC(type, name, args)               type name args
 
+#define SCUMMVM_ID MKTAG('S', 'C', 'V', 'M')
+
 } // namespace AGS3
 
 #endif

engines/ags/lib/audio/digi.cpp

@@ -33,9 +33,15 @@ int digi_card;
 
 int digi_input_card;
 
+static byte dummy_driver_data[1] = { 0 };
+
+BEGIN_DIGI_DRIVER_LIST
+	{ SCUMMVM_ID, &dummy_driver_data, true },
+END_DIGI_DRIVER_LIST
+
 
 int detect_digi_driver(int driver_id) {
-	return 0;
+	return 1;
 }
 
 SAMPLE *load_wav_pf(PACKFILE *f) {

engines/ags/lib/audio/sound.cpp

@@ -27,11 +27,6 @@
 
 namespace AGS3 {
 
-_DRIVER_INFO _digi_driver_list[] = {
-	{ 0, nullptr, 0     }
-};
-
-
 int install_sound(int digi, int midi, const char *cfg_path) {
 	// TODO: install_sound
 	return 0;