Extend GetInvInt to support values up to 54

For sample rates >= 64 kHz with short blocks, the largest sfb
width is 36, which after grouping can be multiplied with 3,
ending up as 108. GetInvInt needs to be able to support
the largest grouped sfb width, divided by two (3 * 36 / 2 = 54).

This fixes VBR encoding with sample rates >= 64 kHz.

libFDK/include/fixpoint_math.h

@@ -438,11 +438,11 @@ inline FIXP_DBL fAddSaturate(const FIXP_DBL a, const FIXP_DBL b)
 
 /*****************************************************************************
 
- array for 1/n, n=1..50
+ array for 1/n, n=1..55
 
 ****************************************************************************/
 
-  extern const FIXP_DBL invCount[50];
+  extern const FIXP_DBL invCount[55];
 
   LNK_SECTION_INITCODE
   inline void InitInvInt(void) {}
@@ -456,8 +456,8 @@ inline FIXP_DBL fAddSaturate(const FIXP_DBL a, const FIXP_DBL b)
  */
 inline FIXP_DBL GetInvInt(int intValue)
 {
-  FDK_ASSERT((intValue > 0) && (intValue < 50));
-  FDK_ASSERT(intValue<50);
+  FDK_ASSERT((intValue > 0) && (intValue < 55));
+  FDK_ASSERT(intValue<55);
 	return invCount[intValue];
 }
 

libFDK/src/FDK_tools_rom.cpp

@@ -1902,7 +1902,7 @@ const USHORT sqrt_tab[49]={
 0xb504};
 
 LNK_SECTION_CONSTDATA_L1
-const FIXP_DBL invCount[50]=  /* This could be 16-bit wide */
+const FIXP_DBL invCount[55]=  /* This could be 16-bit wide */
 {
     0x00000000, 0x7fffffff, 0x40000000, 0x2aaaaaab, 0x20000000,
     0x1999999a, 0x15555555, 0x12492492, 0x10000000, 0x0e38e38e,
@@ -1913,7 +1913,8 @@ const FIXP_DBL invCount[50]=  /* This could be 16-bit wide */
     0x04444444, 0x04210842, 0x04000000, 0x03e0f83e, 0x03c3c3c4,
     0x03a83a84, 0x038e38e4, 0x03759f23, 0x035e50d8, 0x03483483,
     0x03333333, 0x031f3832, 0x030c30c3, 0x02fa0be8, 0x02e8ba2f,
-    0x02d82d83, 0x02c8590b, 0x02b93105, 0x02aaaaab, 0x029cbc15
+    0x02d82d83, 0x02c8590b, 0x02b93105, 0x02aaaaab, 0x029cbc15,
+    0x028f5c29, 0x02828283, 0x02762763, 0x026a43a0, 0x025ed098
 };