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fixed endianness coversion functions

--- a/frontend/mp4write.c

+++ b/frontend/mp4write.c

@@ -47,19 +47,23 @@

 static FILE *g_fout = NULL;

-static inline uint32_t bswap32(uint32_t u32)

+static inline uint32_t be32(uint32_t u32)

 {

 #ifndef WORDS_BIGENDIAN

     //return __bswap_32(u32);

     return __builtin_bswap32(u32);

+#else

+    return u32;

 #endif

 }

-static inline uint16_t bswap16(uint16_t u16)

+static inline uint16_t be16(uint16_t u16)

 {

 #ifndef WORDS_BIGENDIAN

     //return __bswap_16(u16);

     return __builtin_bswap16(u16);

+#else

+    return u16;

 #endif

 }

@@ -80,13 +84,13 @@

 static int u32out(uint32_t u32)

 {

-    u32 = bswap32(u32);

+    u32 = be32(u32);

     return dataout(&u32, 4);

 }

 static int u16out(uint16_t u16)

 {

-    u16 = bswap16(u16);

+    u16 = be16(u16);

     return dataout(&u16, 2);

 }