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add unaligned16() and unaligned64()

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Originally committed as revision 5366 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Måns Rullgård 2006-05-11 23:17:23 +00:00
parent e1203ac098
commit b8d10977f4
1 changed files with 19 additions and 10 deletions
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29
libavcodec/bitstream.h
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@ -141,25 +141,34 @@ typedef struct RL_VLC_ELEM {
/* used to avoid missaligned exceptions on some archs (alpha, ...) */ /* used to avoid missaligned exceptions on some archs (alpha, ...) */
#if defined(ARCH_X86) || defined(ARCH_X86_64) #if defined(ARCH_X86) || defined(ARCH_X86_64)
# define unaligned16(a) (*(const uint16_t*)(a))
# define unaligned32(a) (*(const uint32_t*)(a)) # define unaligned32(a) (*(const uint32_t*)(a))
# define unaligned64(a) (*(const uint64_t*)(a))
#else #else
# ifdef __GNUC__ # ifdef __GNUC__
static inline uint32_t unaligned32(const void *v) { # define unaligned(x) \
struct Unaligned { static inline uint##x##_t unaligned##x(const void *v) { \
uint32_t i; struct Unaligned { \
} __attribute__((packed)); uint##x##_t i; \
} __attribute__((packed)); \
return ((const struct Unaligned *) v)->i; \
return ((const struct Unaligned *) v)->i; \
} }
# elif defined(__DECC) # elif defined(__DECC)
static inline uint32_t unaligned32(const void *v) { # define unaligned(x) \
return *(const __unaligned uint32_t *) v; static inline uint##x##_t unaligned##x##(const void *v) { \
return *(const __unaligned uint##x##_t *) v; \
} }
# else # else
static inline uint32_t unaligned32(const void *v) { # define unaligned(x) \
return *(const uint32_t *) v; static inline uint##x##_t unaligned##x##(const void *v) { \
return *(const uint##x##_t *) v; \
} }
# endif # endif
unaligned(16)
unaligned(32)
unaligned(64)
#undef unaligned
#endif //!ARCH_X86 #endif //!ARCH_X86
#ifndef ALT_BITSTREAM_WRITER #ifndef ALT_BITSTREAM_WRITER