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Enlarge CELT pseudo-stack for floating point unless an architecture specific value
has been set. This fixes a crash bug for some platforms with 512 sample frames and stereo.

--- a/libcelt/arch.h

+++ b/libcelt/arch.h

@@ -237,6 +237,12 @@

 #endif /* !CONFIG_TI_C54X */

-

+#ifndef GLOBAL_STACK_SIZE 

+#ifdef FIXED_POINT

+#define GLOBAL_STACK_SIZE 25000

+#else

+#define GLOBAL_STACK_SIZE 40000

+#endif

+#endif 

 #endif /* ARCH_H */

--- a/libcelt/stack_alloc.h

+++ b/libcelt/stack_alloc.h

@@ -131,7 +131,7 @@

 #define VARDECL(type, var) type *var

 #define ALLOC(var, size, type) var = PUSH(global_stack, size, type)

 #define SAVE_STACK char *_saved_stack = global_stack;

-#define ALLOC_STACK (global_stack = (global_stack==0) ? celt_alloc_scratch(25000) : global_stack)

+#define ALLOC_STACK (global_stack = (global_stack==0) ? celt_alloc_scratch(GLOBAL_STACK_SIZE) : global_stack)

 #endif