Add default byond sound environment defines (tgstation#14427)

Co-authored-by: Dikozda <[email protected]>

code/__DEFINES/sound.dm

@@ -32,3 +32,32 @@
 
 ///Frequency stuff only works with 45kbps oggs.
 #define GET_RAND_FREQUENCY (rand(32000, 55000))
+
+//default byond sound environments
+#define SOUND_ENVIRONMENT_NONE -1
+#define SOUND_ENVIRONMENT_GENERIC 0
+#define SOUND_ENVIRONMENT_PADDED_CELL 1
+#define SOUND_ENVIRONMENT_ROOM 2
+#define SOUND_ENVIRONMENT_BATHROOM 3
+#define SOUND_ENVIRONMENT_LIVINGROOM 4
+#define SOUND_ENVIRONMENT_STONEROOM 5
+#define SOUND_ENVIRONMENT_AUDITORIUM 6
+#define SOUND_ENVIRONMENT_CONCERT_HALL 7
+#define SOUND_ENVIRONMENT_CAVE 8
+#define SOUND_ENVIRONMENT_ARENA 9
+#define SOUND_ENVIRONMENT_HANGAR 10
+#define SOUND_ENVIRONMENT_CARPETED_HALLWAY 11
+#define SOUND_ENVIRONMENT_HALLWAY 12
+#define SOUND_ENVIRONMENT_STONE_CORRIDOR 13
+#define SOUND_ENVIRONMENT_ALLEY 14
+#define SOUND_ENVIRONMENT_FOREST 15
+#define SOUND_ENVIRONMENT_CITY 16
+#define SOUND_ENVIRONMENT_MOUNTAINS 17
+#define SOUND_ENVIRONMENT_QUARRY 18
+#define SOUND_ENVIRONMENT_PLAIN 19
+#define SOUND_ENVIRONMENT_PARKING_LOT 20
+#define SOUND_ENVIRONMENT_SEWER_PIPE 21
+#define SOUND_ENVIRONMENT_UNDERWATER 22
+#define SOUND_ENVIRONMENT_DRUGGED 23
+#define SOUND_ENVIRONMENT_DIZZY 24
+#define SOUND_ENVIRONMENT_PSYCHOTIC 25

code/game/sound.dm

@@ -106,7 +106,7 @@ A good representation is: 'byond applies a volume reduction to the sound every X
 		S.falloff = falloff ? falloff : FALLOFF_SOUNDS * max(round(S.volume * 0.05), 1)
 
 	if(!is_global)
-		S.environment = 2
+		S.environment = SOUND_ENVIRONMENT_ROOM
 
 	SEND_SOUND(src, S)