get rid of WORDS_BIGENDIAN

WORDS_BIGENDIAN is defiend by config.h

Use __BYTE_ORDER__  defined by GNU compilers (POSIX 2024 further defines
endian.h header but not yet in macOS /15/),

src/aja_common.cpp

@@ -50,7 +50,7 @@
 #include "aja_common.hpp" // include after color_out to override its stuff for MSVC
 
 #ifndef BYTE_SWAP
-#ifdef WORDS_BIGENDIAN
+#if !defined  _MSC_VER && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define BYTE_SWAP(x) (3 - x)
 #else
 #define BYTE_SWAP(x) x

src/libavcodec/from_lavc_vid_conv.c

@@ -71,7 +71,7 @@
 
 #define MOD_NAME "[from_lavc_vid_conv] "
 
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define BYTE_SWAP(x) (3 - x)
 #else
 #define BYTE_SWAP(x) x

src/libavcodec/to_lavc_vid_conv.c

@@ -66,7 +66,7 @@
 
 #define MOD_NAME "[to_lavc_vid_conv] "
 
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define BYTE_SWAP(x) (3 - x)
 #else
 #define BYTE_SWAP(x) x
@@ -1152,12 +1152,6 @@ static void r10k_to_gbrp16le(AVFrame * __restrict out_frame, const unsigned char
         r10k_to_gbrpXXle(out_frame, in_data, width, height, 16U);
 }
 
-#ifdef WORDS_BIGENDIAN
-#define BYTE_SWAP(x) (3 - x)
-#else
-#define BYTE_SWAP(x) x
-#endif
-
 /// @note out_depth needs to be at least 12
 #if defined __GNUC__
 static inline void r12l_to_gbrpXXle(AVFrame * __restrict out_frame, const unsigned char * __restrict in_data, int width, int height, unsigned int out_depth)

src/rtp/rtp.c

@@ -143,7 +143,7 @@ static void rtp_process_data(struct rtp *session, uint32_t curr_rtp_ts,
 #define RTCP_RX   205
 
 typedef struct {
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
         unsigned short version:2;       /* packet type            */
         unsigned short p:1;     /* padding flag           */
         unsigned short count:5; /* varies by payload type */

src/utils/macros.h

@@ -108,7 +108,7 @@
  * Therefore, this is stored as a big endian even on little-endian architectures - first byte
  * of FourCC is in the memory on the lowest address.
  */
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
 #define to_fourcc(a,b,c,d)     (((uint32_t)(d)) | ((uint32_t)(c)<<8U) | ((uint32_t)(b)<<16U) | ((uint32_t)(a)<<24U))
 #else
 #define to_fourcc(a,b,c,d)     (((uint32_t)(a)) | ((uint32_t)(b)<<8U) | ((uint32_t)(c)<<16U) | ((uint32_t)(d)<<24U))

src/video_codec.c

@@ -79,12 +79,6 @@
 
 char pixfmt_conv_pref[] = "dsc"; ///< bitdepth, subsampling, color space
 
-#ifdef WORDS_BIGENDIAN
-#define BYTE_SWAP(x) (3 - x)
-#else
-#define BYTE_SWAP(x) x
-#endif
-
 #ifdef __SSE2__
 static void vc_deinterlace_aligned(unsigned char *src, long src_linesize, int lines);
 static void vc_deinterlace_unaligned(unsigned char *src, long src_linesize, int lines);