lavc: add ff_u8_to_s8() for safe type punning of uint8_t to int8_t

11 years ago · 9ae53c5860
parent 5626f994f2
commit 9ae53c5860
1 changed files with 10 additions and 0 deletions
--- a/libavcodec/mathops.h
+++ b/libavcodec/mathops.h
@ -224,4 +224,14 @@ static inline av_const unsigned int ff_sqrt(unsigned int a)
    return b - (a < b * b);
 }

+static inline int8_t ff_u8_to_s8(uint8_t a)
+{
+    union {
+        uint8_t u8;
+        int8_t  s8;
+    } b;
+    b.u8 = a;
+    return b.s8;
+}
+
 #endif /* AVCODEC_MATHOPS_H */