Use a flexible array for the front stablizer delay buffers

alc/alc.cpp

@@ -2095,7 +2095,10 @@ static ALCenum UpdateDeviceParams(ALCdevice *device, const int *attrList)
     case DevFmtX71:
         if(GetConfigValueBool(device->DeviceName.c_str(), nullptr, "front-stablizer", 0))
         {
-            auto stablizer = std::make_unique<FrontStablizer>();
+            auto stablizer = FrontStablizer::Create(device->channelsFromFmt());
+            for(auto &buf : stablizer->DelayBuf)
+                std::fill(buf.begin(), buf.end(), 0.0f);
+
             /* Initialize band-splitting filter for the mid signal, with a
              * crossover at 5khz (could be higher).
              */

alc/front_stablizer.h

@@ -1,25 +1,33 @@
 #ifndef ALC_FRONT_STABLIZER_H
 #define ALC_FRONT_STABLIZER_H
 
+#include <array>
+#include <memory>
+
 #include "alcmain.h"
 #include "almalloc.h"
-#include "devformat.h"
 #include "filters/splitter.h"
 
 
 struct FrontStablizer {
     static constexpr size_t DelayLength{256u};
 
+    FrontStablizer(size_t numchans) : DelayBuf{numchans} { }
+
     BandSplitter MidFilter;
-    alignas(16) float MidLF[BUFFERSIZE];
-    alignas(16) float MidHF[BUFFERSIZE];
-    alignas(16) float Side[BUFFERSIZE];
+    alignas(16) float MidLF[BUFFERSIZE]{};
+    alignas(16) float MidHF[BUFFERSIZE]{};
+    alignas(16) float Side[BUFFERSIZE]{};
 
-    alignas(16) float TempBuf[BUFFERSIZE + DelayLength];
+    alignas(16) float TempBuf[BUFFERSIZE + DelayLength]{};
 
-    alignas(16) float DelayBuf[MAX_OUTPUT_CHANNELS][DelayLength];
+    using DelayLine = std::array<float,DelayLength>;
+    al::FlexArray<DelayLine,16> DelayBuf;
 
-    DEF_NEWDEL(FrontStablizer)
+    static std::unique_ptr<FrontStablizer> Create(size_t numchans)
+    { return std::unique_ptr<FrontStablizer>{new(FamCount{numchans}) FrontStablizer{numchans}}; }
+
+    DEF_FAM_NEWDEL(FrontStablizer, DelayBuf)
 };
 
 #endif /* ALC_FRONT_STABLIZER_H */