Add AD1881 codec for the WIP branch's Gigabyte GA-6VX-4X

src/include/86box/snd_ac97.h

@@ -44,6 +44,7 @@ extern ac97_codec_t	**ac97_codec, **ac97_modem_codec;
 extern int		ac97_codec_count, ac97_modem_codec_count,
 			ac97_codec_id, ac97_modem_codec_id;
 
+extern const device_t	ad1881_device;
 extern const device_t	alc100_device;
 extern const device_t	cs4297_device;
 extern const device_t	cs4297a_device;

src/sound/snd_ac97_codec.c

@@ -29,6 +29,7 @@
 
 
 enum {
+    AC97_CODEC_AD1881 = AC97_VENDOR_ID('A', 'D', 'S', 0x40),
     AC97_CODEC_ALC100 = AC97_VENDOR_ID('A', 'L', 'C', 0x20),
     AC97_CODEC_CS4297 = AC97_VENDOR_ID('C', 'R', 'Y', 0x03),
     AC97_CODEC_CS4297A = AC97_VENDOR_ID('C', 'R', 'Y', 0x13),
@@ -332,6 +333,18 @@ ac97_codec_close(void *priv)
 }
 
 
+const device_t ad1881_device =
+{
+    "Analog Devices AD1881",
+    DEVICE_AC97,
+    AC97_CODEC_AD1881,
+    ac97_codec_init, ac97_codec_close, ac97_codec_reset,
+    { NULL },
+    NULL,
+    NULL,
+    NULL
+};
+
 const device_t alc100_device =
 {
     "Avance Logic ALC100",