diff --git a/libavutil/avutil.h b/libavutil/avutil.h
index 08cc615671..d5a4570dca 100644
--- a/libavutil/avutil.h
+++ b/libavutil/avutil.h
@@ -34,8 +34,8 @@ extern "C" {
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVUTIL_VERSION_INT   ((49<<16)+(1<<8)+0)
-#define LIBAVUTIL_VERSION       49.1.0
+#define LIBAVUTIL_VERSION_INT   ((49<<16)+(2<<8)+0)
+#define LIBAVUTIL_VERSION       49.2.0
 #define LIBAVUTIL_BUILD         LIBAVUTIL_VERSION_INT
 
 #define LIBAVUTIL_IDENT         "Lavu" AV_STRINGIFY(LIBAVUTIL_VERSION)
diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h
index c2b460984f..e6db5ce6f5 100644
--- a/libavutil/intreadwrite.h
+++ b/libavutil/intreadwrite.h
@@ -26,17 +26,40 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
 #endif /* !__GNUC__ */
 
 /* endian macros */
-#if !defined(AV_RB16) || !defined(AV_RB32) || !defined(AV_RL16) || !defined(AV_RL32)
-#define AV_RB16(x)  ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
-#define AV_RB32(x)  ((((uint8_t*)(x))[0] << 24) | \
+#define AV_RB8(x)  (((uint8_t*)(x))[0])
+#define AV_WB8(p, i, d)  { ((uint8_t*)(p))[(i)] = (d); }
+
+#define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
+#define AV_WB16(p, i, d) { \
+                    ((uint8_t*)(p))[(i)+1] = (d); \
+                    ((uint8_t*)(p))[(i)] = (d)>>8; }
+
+#define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
                    (((uint8_t*)(x))[1] << 16) | \
                    (((uint8_t*)(x))[2] << 8) | \
                     ((uint8_t*)(x))[3])
-#define AV_RL16(x)  ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
-#define AV_RL32(x)  ((((uint8_t*)(x))[3] << 24) | \
+#define AV_WB32(p, i, d) { \
+                    ((uint8_t*)(p))[(i)+3] = (d); \
+                    ((uint8_t*)(p))[(i)+2] = (d)>>8; \
+                    ((uint8_t*)(p))[(i)+1] = (d)>>16; \
+                    ((uint8_t*)(p))[(i)] = (d)>>24; }
+
+#define AV_RL8(x)  AV_RB8(x)
+#define AV_WL8(p, i, d)  AV_WB8(p, i, d)
+
+#define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
+#define AV_WL16(p, i, d) { \
+                    ((uint8_t*)(p))[(i)] = (d); \
+                    ((uint8_t*)(p))[(i)+1] = (d)>>8; }
+
+#define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
                    (((uint8_t*)(x))[2] << 16) | \
                    (((uint8_t*)(x))[1] << 8) | \
                     ((uint8_t*)(x))[0])
-#endif
+#define AV_WL32(p, i, d) { \
+                    ((uint8_t*)(p))[(i)] = (d); \
+                    ((uint8_t*)(p))[(i)+1] = (d)>>8; \
+                    ((uint8_t*)(p))[(i)+2] = (d)>>16; \
+                    ((uint8_t*)(p))[(i)+3] = (d)>>24; }
 
 #endif /* INTREADWRITE_H */