Index: apps/codecs/libmusepack/synth_filter.c
===================================================================
--- apps/codecs/libmusepack/synth_filter.c	(revision 16465)
+++ apps/codecs/libmusepack/synth_filter.c	(working copy)
@@ -120,6 +120,9 @@
 
 #undef  _
 
+// needed to prevent from internal overflow in calculate_V
+#define OVERFLOW_FIX 1
+
 // V-coefficients were expanded (<<) by V_COEFFICIENT_EXPAND
 #define V_COEFFICIENT_EXPAND 27
 
@@ -294,22 +297,22 @@
     V[42] = tmp - A[10] - A[11];
     // 9 adds, 9 subs
 
-    A[ 0] = MPC_MULTIPLY_V((Sample[ 0] - Sample[31]), INVCOS01);
-    A[ 1] = MPC_MULTIPLY_V((Sample[ 1] - Sample[30]), INVCOS03);
-    A[ 2] = MPC_MULTIPLY_V((Sample[ 2] - Sample[29]), INVCOS05);
-    A[ 3] = MPC_MULTIPLY_V((Sample[ 3] - Sample[28]), INVCOS07);
-    A[ 4] = MPC_MULTIPLY_V((Sample[ 4] - Sample[27]), INVCOS09);
-    A[ 5] = MPC_MULTIPLY_V((Sample[ 5] - Sample[26]), INVCOS11);
-    A[ 6] = MPC_MULTIPLY_V((Sample[ 6] - Sample[25]), INVCOS13);
-    A[ 7] = MPC_MULTIPLY_V((Sample[ 7] - Sample[24]), INVCOS15);
-    A[ 8] = MPC_MULTIPLY_V((Sample[ 8] - Sample[23]), INVCOS17);
-    A[ 9] = MPC_MULTIPLY_V((Sample[ 9] - Sample[22]), INVCOS19);
-    A[10] = MPC_MULTIPLY_V((Sample[10] - Sample[21]), INVCOS21);
-    A[11] = MPC_MULTIPLY_V((Sample[11] - Sample[20]), INVCOS23);
-    A[12] = MPC_MULTIPLY_V((Sample[12] - Sample[19]), INVCOS25);
-    A[13] = MPC_MULTIPLY_V((Sample[13] - Sample[18]), INVCOS27);
-    A[14] = MPC_MULTIPLY_V((Sample[14] - Sample[17]), INVCOS29);
-    A[15] = MPC_MULTIPLY_V((Sample[15] - Sample[16]), INVCOS31);
+    A[ 0] = MPC_MULTIPLY_V(((Sample[ 0] - Sample[31])>>OVERFLOW_FIX), INVCOS01);
+    A[ 1] = MPC_MULTIPLY_V(((Sample[ 1] - Sample[30])>>OVERFLOW_FIX), INVCOS03);
+    A[ 2] = MPC_MULTIPLY_V(((Sample[ 2] - Sample[29])>>OVERFLOW_FIX), INVCOS05);
+    A[ 3] = MPC_MULTIPLY_V(((Sample[ 3] - Sample[28])>>OVERFLOW_FIX), INVCOS07);
+    A[ 4] = MPC_MULTIPLY_V(((Sample[ 4] - Sample[27])>>OVERFLOW_FIX), INVCOS09);
+    A[ 5] = MPC_MULTIPLY_V(((Sample[ 5] - Sample[26])>>OVERFLOW_FIX), INVCOS11);
+    A[ 6] = MPC_MULTIPLY_V(((Sample[ 6] - Sample[25])>>OVERFLOW_FIX), INVCOS13);
+    A[ 7] = MPC_MULTIPLY_V(((Sample[ 7] - Sample[24])>>OVERFLOW_FIX), INVCOS15);
+    A[ 8] = MPC_MULTIPLY_V(((Sample[ 8] - Sample[23])>>OVERFLOW_FIX), INVCOS17);
+    A[ 9] = MPC_MULTIPLY_V(((Sample[ 9] - Sample[22])>>OVERFLOW_FIX), INVCOS19);
+    A[10] = MPC_MULTIPLY_V(((Sample[10] - Sample[21])>>OVERFLOW_FIX), INVCOS21);
+    A[11] = MPC_MULTIPLY_V(((Sample[11] - Sample[20])>>OVERFLOW_FIX), INVCOS23);
+    A[12] = MPC_MULTIPLY_V(((Sample[12] - Sample[19])>>OVERFLOW_FIX), INVCOS25);
+    A[13] = MPC_MULTIPLY_V(((Sample[13] - Sample[18])>>OVERFLOW_FIX), INVCOS27);
+    A[14] = MPC_MULTIPLY_V(((Sample[14] - Sample[17])>>OVERFLOW_FIX), INVCOS29);
+    A[15] = MPC_MULTIPLY_V(((Sample[15] - Sample[16])>>OVERFLOW_FIX), INVCOS31);
     // 16 subs, 16 muls, 16 shifts
 
     B[ 0] = A[ 0] + A[15];
@@ -366,22 +369,22 @@
     B[15] = MPC_MULTIPLY_V((A[13] - A[14]), INVCOS24);
     // 8 adds, 8 subs, 8 muls, 8 shift
 
-    A[ 0] = B[ 0] + B[ 1];
-    A[ 1] = MPC_MULTIPLY_V((B[ 0] - B[ 1]), INVCOS16);
-    A[ 2] = B[ 2] + B[ 3];
-    A[ 3] = MPC_MULTIPLY_V((B[ 2] - B[ 3]), INVCOS16);
-    A[ 4] = B[ 4] + B[ 5];
-    A[ 5] = MPC_MULTIPLY_V((B[ 4] - B[ 5]), INVCOS16);
-    A[ 6] = B[ 6] + B[ 7];
-    A[ 7] = MPC_MULTIPLY_V((B[ 6] - B[ 7]), INVCOS16);
-    A[ 8] = B[ 8] + B[ 9];
-    A[ 9] = MPC_MULTIPLY_V((B[ 8] - B[ 9]), INVCOS16);
-    A[10] = B[10] + B[11];
-    A[11] = MPC_MULTIPLY_V((B[10] - B[11]), INVCOS16);
-    A[12] = B[12] + B[13];
-    A[13] = MPC_MULTIPLY_V((B[12] - B[13]), INVCOS16);
-    A[14] = B[14] + B[15];
-    A[15] = MPC_MULTIPLY_V((B[14] - B[15]), INVCOS16);
+    A[ 0] = (B[ 0] + B[ 1])<<OVERFLOW_FIX;
+    A[ 1] = (MPC_MULTIPLY_V((B[ 0] - B[ 1]), INVCOS16))<<OVERFLOW_FIX;
+    A[ 2] = (B[ 2] + B[ 3])<<OVERFLOW_FIX;
+    A[ 3] = (MPC_MULTIPLY_V((B[ 2] - B[ 3]), INVCOS16))<<OVERFLOW_FIX;
+    A[ 4] = (B[ 4] + B[ 5])<<OVERFLOW_FIX;
+    A[ 5] = (MPC_MULTIPLY_V((B[ 4] - B[ 5]), INVCOS16))<<OVERFLOW_FIX;
+    A[ 6] = (B[ 6] + B[ 7])<<OVERFLOW_FIX;
+    A[ 7] = (MPC_MULTIPLY_V((B[ 6] - B[ 7]), INVCOS16))<<OVERFLOW_FIX;
+    A[ 8] = (B[ 8] + B[ 9])<<OVERFLOW_FIX;
+    A[ 9] = (MPC_MULTIPLY_V((B[ 8] - B[ 9]), INVCOS16))<<OVERFLOW_FIX;
+    A[10] = (B[10] + B[11])<<OVERFLOW_FIX;
+    A[11] = (MPC_MULTIPLY_V((B[10] - B[11]), INVCOS16))<<OVERFLOW_FIX;
+    A[12] = (B[12] + B[13])<<OVERFLOW_FIX;
+    A[13] = (MPC_MULTIPLY_V((B[12] - B[13]), INVCOS16))<<OVERFLOW_FIX;
+    A[14] = (B[14] + B[15])<<OVERFLOW_FIX;
+    A[15] = (MPC_MULTIPLY_V((B[14] - B[15]), INVCOS16))<<OVERFLOW_FIX;
     // 8 adds, 8 subs, 8 muls, 8 shift
 
     // multiple used expressions: A[ 4]+A[ 6]+A[ 7], A[ 9]+A[13]+A[15]