Add audio engine initialization check

Fixes various bugs when movie system attemps to create audio buffer with
sound system being disabled via fallout2.cfg.

src/audio_engine.cc

@@ -34,6 +34,11 @@ static SDL_AudioSpec gAudioEngineSpec;
 static SDL_AudioDeviceID gAudioEngineDeviceId = -1;
 static AudioEngineSoundBuffer gAudioEngineSoundBuffers[AUDIO_ENGINE_SOUND_BUFFERS];
 
+static bool audioEngineIsInitialized()
+{
+    return gAudioEngineDeviceId != -1;
+}
+
 static bool soundBufferIsValid(int soundBufferIndex)
 {
     return soundBufferIndex >= 0 && soundBufferIndex < AUDIO_ENGINE_SOUND_BUFFERS;
@@ -113,30 +118,36 @@ bool audioEngineInit()
 
 void audioEngineExit()
 {
-    if (gAudioEngineDeviceId != -1) {
+    if (audioEngineIsInitialized()) {
         SDL_CloseAudioDevice(gAudioEngineDeviceId);
         gAudioEngineDeviceId = -1;
     }
 
-    SDL_QuitSubSystem(SDL_INIT_AUDIO);
+    if (SDL_WasInit(SDL_INIT_AUDIO)) {
+        SDL_QuitSubSystem(SDL_INIT_AUDIO);
+    }
 }
 
 void audioEnginePause()
 {
-    if (gAudioEngineDeviceId != -1) {
+    if (audioEngineIsInitialized()) {
         SDL_PauseAudioDevice(gAudioEngineDeviceId, 1);
     }
 }
 
 void audioEngineResume()
 {
-    if (gAudioEngineDeviceId != -1) {
+    if (audioEngineIsInitialized()) {
         SDL_PauseAudioDevice(gAudioEngineDeviceId, 0);
     }
 }
 
 int audioEngineCreateSoundBuffer(unsigned int size, int bitsPerSample, int channels, int rate)
 {
+    if (!audioEngineIsInitialized()) {
+        return -1;
+    }
+
     for (int index = 0; index < AUDIO_ENGINE_SOUND_BUFFERS; index++) {
         AudioEngineSoundBuffer* soundBuffer = &(gAudioEngineSoundBuffers[index]);
         std::lock_guard<std::recursive_mutex> lock(soundBuffer->mutex);
@@ -162,6 +173,10 @@ int audioEngineCreateSoundBuffer(unsigned int size, int bitsPerSample, int chann
 
 bool audioEngineSoundBufferRelease(int soundBufferIndex)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -186,6 +201,10 @@ bool audioEngineSoundBufferRelease(int soundBufferIndex)
 
 bool audioEngineSoundBufferSetVolume(int soundBufferIndex, int volume)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -204,6 +223,10 @@ bool audioEngineSoundBufferSetVolume(int soundBufferIndex, int volume)
 
 bool audioEngineSoundBufferGetVolume(int soundBufferIndex, int* volumePtr)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -222,6 +245,10 @@ bool audioEngineSoundBufferGetVolume(int soundBufferIndex, int* volumePtr)
 
 bool audioEngineSoundBufferSetPan(int soundBufferIndex, int pan)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -241,6 +268,10 @@ bool audioEngineSoundBufferSetPan(int soundBufferIndex, int pan)
 
 bool audioEngineSoundBufferPlay(int soundBufferIndex, unsigned int flags)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -263,6 +294,10 @@ bool audioEngineSoundBufferPlay(int soundBufferIndex, unsigned int flags)
 
 bool audioEngineSoundBufferStop(int soundBufferIndex)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -281,6 +316,10 @@ bool audioEngineSoundBufferStop(int soundBufferIndex)
 
 bool audioEngineSoundBufferGetCurrentPosition(int soundBufferIndex, unsigned int* readPosPtr, unsigned int* writePosPtr)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -312,6 +351,10 @@ bool audioEngineSoundBufferGetCurrentPosition(int soundBufferIndex, unsigned int
 
 bool audioEngineSoundBufferSetCurrentPosition(int soundBufferIndex, unsigned int pos)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -330,6 +373,10 @@ bool audioEngineSoundBufferSetCurrentPosition(int soundBufferIndex, unsigned int
 
 bool audioEngineSoundBufferLock(int soundBufferIndex, unsigned int writePos, unsigned int writeBytes, void** audioPtr1, unsigned int* audioBytes1, void** audioPtr2, unsigned int* audioBytes2, unsigned int flags)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -387,6 +434,10 @@ bool audioEngineSoundBufferLock(int soundBufferIndex, unsigned int writePos, uns
 
 bool audioEngineSoundBufferUnlock(int soundBufferIndex, void* audioPtr1, unsigned int audioBytes1, void* audioPtr2, unsigned int audioBytes2)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }
@@ -405,6 +456,10 @@ bool audioEngineSoundBufferUnlock(int soundBufferIndex, void* audioPtr1, unsigne
 
 bool audioEngineSoundBufferGetStatus(int soundBufferIndex, unsigned int* statusPtr)
 {
+    if (!audioEngineIsInitialized()) {
+        return false;
+    }
+
     if (!soundBufferIsValid(soundBufferIndex)) {
         return false;
     }