mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* byte swapping routines
|
|
*/
|
|
|
|
#ifndef AVUTIL_X86_BSWAP_H
|
|
#define AVUTIL_X86_BSWAP_H
|
|
|
|
#include <stdint.h>
|
|
#if defined(_MSC_VER)
|
|
#include <intrin.h>
|
|
#endif
|
|
#include "config.h"
|
|
#include "libavutil/attributes.h"
|
|
|
|
#if defined(_MSC_VER)
|
|
|
|
#define av_bswap16 av_bswap16
|
|
static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
|
|
{
|
|
return _rotr16(x, 8);
|
|
}
|
|
|
|
#define av_bswap32 av_bswap32
|
|
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
|
|
{
|
|
return _byteswap_ulong(x);
|
|
}
|
|
|
|
#if ARCH_X86_64
|
|
#define av_bswap64 av_bswap64
|
|
static inline uint64_t av_const av_bswap64(uint64_t x)
|
|
{
|
|
return _byteswap_uint64(x);
|
|
}
|
|
#endif
|
|
|
|
|
|
#elif HAVE_INLINE_ASM
|
|
|
|
#if AV_GCC_VERSION_AT_MOST(4,0)
|
|
#define av_bswap16 av_bswap16
|
|
static av_always_inline av_const unsigned av_bswap16(unsigned x)
|
|
{
|
|
__asm__("rorw $8, %w0" : "+r"(x));
|
|
return x;
|
|
}
|
|
#endif /* AV_GCC_VERSION_AT_MOST(4,0) */
|
|
|
|
#if AV_GCC_VERSION_AT_MOST(4,4) || defined(__INTEL_COMPILER)
|
|
#define av_bswap32 av_bswap32
|
|
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
|
|
{
|
|
__asm__("bswap %0" : "+r" (x));
|
|
return x;
|
|
}
|
|
|
|
#if ARCH_X86_64
|
|
#define av_bswap64 av_bswap64
|
|
static inline uint64_t av_const av_bswap64(uint64_t x)
|
|
{
|
|
__asm__("bswap %0": "=r" (x) : "0" (x));
|
|
return x;
|
|
}
|
|
#endif
|
|
#endif /* AV_GCC_VERSION_AT_MOST(4,4) */
|
|
|
|
#endif /* HAVE_INLINE_ASM */
|
|
#endif /* AVUTIL_X86_BSWAP_H */
|