Add the ability to opt-out of default output device initialization;

src/api/l_audio.c

@@ -163,6 +163,7 @@ int luaopen_lovr_audio(lua_State* L) {
   luax_register(L, lovrAudio);
   luax_registertype(L, Source);
 
+  bool start = true;
   const char *spatializer = NULL;
   luax_pushconf(L);
   lua_getfield(L, -1, "audio");
@@ -170,13 +171,19 @@ int luaopen_lovr_audio(lua_State* L) {
     lua_getfield(L, -1, "spatializer");
     spatializer = lua_tostring(L, -1);
     lua_pop(L, 1);
+
+    lua_getfield(L, -1, "start");
+    start = lua_isnil(L, -1) || lua_toboolean(L, -1);
+    lua_pop(L, 1);
   }
   lua_pop(L, 2);
 
   if (lovrAudioInit(spatializer)) {
-    lovrAudioSetDevice(AUDIO_PLAYBACK, NULL, 0, PLAYBACK_SAMPLE_RATE, SAMPLE_F32);
-    lovrAudioStart(AUDIO_PLAYBACK);
     luax_atexit(L, lovrAudioDestroy);
+    if (start) {
+      lovrAudioSetDevice(AUDIO_PLAYBACK, NULL, 0, PLAYBACK_SAMPLE_RATE, SAMPLE_F32);
+      lovrAudioStart(AUDIO_PLAYBACK);
+    }
   }
 
   return 1;

src/modules/audio/audio.c

@@ -267,6 +267,7 @@ bool lovrAudioSetDevice(AudioType type, void* id, size_t size, uint32_t sampleRa
   ma_device_config config;
 
   if (type == AUDIO_PLAYBACK) {
+    sampleRate = sampleRate ? sampleRate : PLAYBACK_SAMPLE_RATE;
     lovrAssert(sampleRate == PLAYBACK_SAMPLE_RATE, "Playback sample rate must be %d", PLAYBACK_SAMPLE_RATE);
     lovrAssert(format == SAMPLE_F32, "Playback format must be f32");
     config = ma_device_config_init(ma_device_type_playback);

src/resources/boot.lua

@@ -112,6 +112,10 @@ function lovr.boot()
       thread = true,
       timer = true
     },
+    audio = {
+      start = true,
+      spatializer = 'simple'
+    },
     graphics = {
       debug = false
     },