Make the voices' Send[] array dynamically sized

The voices are still all allocated in one chunk to avoid memory fragmentation.
But they're accessed as an array of pointers since the size isn't static.

Alc/ALc.c

@@ -2607,21 +2607,26 @@ void AllocateVoices(ALCcontext *context, ALsizei num_voices, ALsizei old_sends)
     ALsizei num_sends = device->NumAuxSends;
     struct ALsourceProps *props;
     size_t sizeof_props;
-    ALvoice *voices;
+    size_t sizeof_voice;
+    ALvoice **voices;
+    ALvoice *voice;
     ALsizei v = 0;
     size_t size;
 
     if(num_voices == context->MaxVoices && num_sends == old_sends)
         return;
 
-    /* Allocate the voices, and the voices' stored source property set
-     * (including the dynamically-sized Send[] array) in one chunk.
+    /* Allocate the voice pointers, voices, and the voices' stored source
+     * property set (including the dynamically-sized Send[] array) in one
+     * chunk.
      */
     sizeof_props = RoundUp(offsetof(struct ALsourceProps, Send[num_sends]), 16);
-    size = sizeof(*voices) + sizeof_props;
+    sizeof_voice = RoundUp(offsetof(ALvoice, Send[num_sends]), 16);
+    size = sizeof(ALvoice*) + sizeof_voice + sizeof_props;
 
-    voices = al_calloc(16, size * num_voices);
-    props = (struct ALsourceProps*)(voices + num_voices);
+    voices = al_calloc(16, RoundUp(size*num_voices, 16));
+    voice = (ALvoice*)((char*)voices + RoundUp(num_voices*sizeof(ALvoice*), 16));
+    props = (struct ALsourceProps*)((char*)voice + num_voices*sizeof_voice);
 
     if(context->Voices)
     {
@@ -2634,23 +2639,34 @@ void AllocateVoices(ALCcontext *context, ALsizei num_voices, ALsizei old_sends)
             /* Copy the old voice data and source property set to the new
              * storage.
              */
-            voices[v] = context->Voices[v];
-            *props = *(context->Voices[v].Props);
+            *voice = *(context->Voices[v]);
             for(i = 0;i < s_count;i++)
-                props->Send[i] = context->Voices[v].Props->Send[i];
+                voice->Send[i] = context->Voices[v]->Send[i];
+            *props = *(context->Voices[v]->Props);
+            for(i = 0;i < s_count;i++)
+                props->Send[i] = context->Voices[v]->Props->Send[i];
 
             /* Set this voice's property set pointer and increment 'props' to
              * the next property storage space.
              */
-            voices[v].Props = props;
+            voice->Props = props;
             props = (struct ALsourceProps*)((char*)props + sizeof_props);
+
+            /* Set this voice's reference and increment 'voice' to the next
+             * voice storage space.
+             */
+            voices[v] = voice;
+            voice = (ALvoice*)((char*)voice + sizeof_voice);
         }
     }
-    /* Finish setting the voices' property set pointers. */
+    /* Finish setting the voices' property set pointers and references. */
     for(;v < num_voices;v++)
     {
-        voices[v].Props = props;
+        voice->Props = props;
         props = (struct ALsourceProps*)((char*)props + sizeof_props);
+
+        voices[v] = voice;
+        voice = (ALvoice*)((char*)voice + sizeof_voice);
     }
 
     al_free(context->Voices);

Alc/ALu.c

@@ -1313,7 +1313,7 @@ static void CalcSourceParams(ALvoice *voice, ALCcontext *context, ALboolean forc
 
 static void UpdateContextSources(ALCcontext *ctx, ALeffectslot *slot)
 {
-    ALvoice *voice, *voice_end;
+    ALvoice **voice, **voice_end;
     ALsource *source;
 
     IncrementRef(&ctx->UpdateCount);
@@ -1330,11 +1330,11 @@ static void UpdateContextSources(ALCcontext *ctx, ALeffectslot *slot)
         voice_end = voice + ctx->VoiceCount;
         for(;voice != voice_end;++voice)
         {
-            if(!(source=voice->Source)) continue;
+            if(!(source=(*voice)->Source)) continue;
             if(!IsPlayingOrPaused(source))
-                voice->Source = NULL;
+                (*voice)->Source = NULL;
             else
-                CalcSourceParams(voice, ctx, force);
+                CalcSourceParams(*voice, ctx, force);
         }
     }
     IncrementRef(&ctx->UpdateCount);
@@ -1424,7 +1424,7 @@ DECL_TEMPLATE(ALbyte, aluF2B)
 void aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
 {
     ALsizei SamplesToDo;
-    ALvoice *voice, *voice_end;
+    ALvoice **voice, **voice_end;
     ALeffectslot *slot;
     ALsource *source;
     ALCcontext *ctx;
@@ -1475,11 +1475,11 @@ void aluMixData(ALCdevice *device, ALvoid *buffer, ALsizei size)
             voice_end = voice + ctx->VoiceCount;
             for(;voice != voice_end;++voice)
             {
-                ALboolean IsVoiceInit = (voice->Step > 0);
-                source = voice->Source;
+                ALboolean IsVoiceInit = ((*voice)->Step > 0);
+                source = (*voice)->Source;
                 if(IsVoiceInit && source &&
                    ATOMIC_LOAD(&source->state, almemory_order_relaxed) == AL_PLAYING)
-                    MixSource(voice, source, device, SamplesToDo);
+                    MixSource(*voice, source, device, SamplesToDo);
             }
 
             /* effect slot processing */
@@ -1637,15 +1637,15 @@ void aluHandleDisconnect(ALCdevice *device)
     Context = ATOMIC_LOAD_SEQ(&device->ContextList);
     while(Context)
     {
-        ALvoice *voice, *voice_end;
+        ALvoice **voice, **voice_end;
 
         voice = Context->Voices;
         voice_end = voice + Context->VoiceCount;
         while(voice != voice_end)
         {
             ALenum playing = AL_PLAYING;
-            ALsource *source = voice->Source;
-            voice->Source = NULL;
+            ALsource *source = (*voice)->Source;
+            (*voice)->Source = NULL;
 
             if(source &&
                ATOMIC_COMPARE_EXCHANGE_STRONG_SEQ(ALenum, &source->state, &playing, AL_STOPPED))

OpenAL32/Include/alMain.h

@@ -812,7 +812,7 @@ struct ALCcontext_struct {
 
     ALfloat GainBoost;
 
-    struct ALvoice *Voices;
+    struct ALvoice **Voices;
     ALsizei VoiceCount;
     ALsizei MaxVoices;
 

OpenAL32/Include/alSource.h

@@ -106,7 +106,7 @@ typedef struct ALvoice {
 
         ALfloat (*Buffer)[BUFFERSIZE];
         ALsizei Channels;
-    } Send[MAX_SENDS];
+    } Send[];
 } ALvoice;
 
 

OpenAL32/alSource.c

@@ -128,12 +128,12 @@ static ALboolean GetSourcei64v(ALsource *Source, ALCcontext *Context, SourceProp
 
 static inline ALvoice *GetSourceVoice(const ALsource *source, const ALCcontext *context)
 {
-    ALvoice *voice = context->Voices;
-    ALvoice *voice_end = voice + context->VoiceCount;
+    ALvoice **voice = context->Voices;
+    ALvoice **voice_end = voice + context->VoiceCount;
     while(voice != voice_end)
     {
-        if(voice->Source == source)
-            return voice;
+        if((*voice)->Source == source)
+            return *voice;
         ++voice;
     }
     return NULL;
@@ -2915,7 +2915,7 @@ void UpdateAllSourceProps(ALCcontext *context)
 
     for(pos = 0;pos < context->VoiceCount;pos++)
     {
-        ALvoice *voice = &context->Voices[pos];
+        ALvoice *voice = context->Voices[pos];
         ALsource *source = voice->Source;
         if(source != NULL && source->NeedsUpdate && IsPlayingOrPaused(source))
         {
@@ -2982,16 +2982,16 @@ ALvoid SetSourceState(ALsource *Source, ALCcontext *Context, ALenum state)
         {
             for(i = 0;i < Context->VoiceCount;i++)
             {
-                if(Context->Voices[i].Source == NULL)
+                if(Context->Voices[i]->Source == NULL)
                 {
-                    voice = &Context->Voices[i];
+                    voice = Context->Voices[i];
                     voice->Source = Source;
                     break;
                 }
             }
             if(voice == NULL)
             {
-                voice = &Context->Voices[Context->VoiceCount++];
+                voice = Context->Voices[Context->VoiceCount++];
                 voice->Source = Source;
             }
             discontinuity = AL_TRUE;