From cf1e119bb21c6d041acf9b33e1693e41e99b08f1 Mon Sep 17 00:00:00 2001 From: Reimar Döffinger Date: Sun, 3 Dec 2006 16:35:30 +0000 Subject: Move BE_*/LE_*/ST*/LD* macros to a common place. Some further optimization/cleanup would be desirable (e.g. LE_* and LD* should be the same on x86). Originally committed as revision 7218 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavutil/intreadwrite.h | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) create mode 100644 libavutil/intreadwrite.h (limited to 'libavutil/intreadwrite.h') diff --git a/libavutil/intreadwrite.h b/libavutil/intreadwrite.h new file mode 100644 index 0000000000..c43f9d6517 --- /dev/null +++ b/libavutil/intreadwrite.h @@ -0,0 +1,42 @@ +#ifndef INTREADWRITE_H +#define INTREADWRITE_H + +#ifdef __GNUC__ + +struct unaligned_64 { uint64_t l; } __attribute__((packed)); +struct unaligned_32 { uint32_t l; } __attribute__((packed)); +struct unaligned_16 { uint16_t l; } __attribute__((packed)); + +#define LD16(a) (((const struct unaligned_16 *) (a))->l) +#define LD32(a) (((const struct unaligned_32 *) (a))->l) +#define LD64(a) (((const struct unaligned_64 *) (a))->l) + +#define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b) +#define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b) + +#else /* __GNUC__ */ + +#define LD16(a) (*((uint16_t*)(a))) +#define LD32(a) (*((uint32_t*)(a))) +#define LD64(a) (*((uint64_t*)(a))) + +#define ST16(a, b) *((uint16_t*)(a)) = (b) +#define ST32(a, b) *((uint32_t*)(a)) = (b) + +#endif /* !__GNUC__ */ + +/* endian macros */ +#if !defined(BE_16) || !defined(BE_32) || !defined(LE_16) || !defined(LE_32) +#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) +#define BE_32(x) ((((uint8_t*)(x))[0] << 24) | \ + (((uint8_t*)(x))[1] << 16) | \ + (((uint8_t*)(x))[2] << 8) | \ + ((uint8_t*)(x))[3]) +#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) +#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ + (((uint8_t*)(x))[2] << 16) | \ + (((uint8_t*)(x))[1] << 8) | \ + ((uint8_t*)(x))[0]) +#endif + +#endif /* INTREADWRITE_H */ -- cgit v1.2.3