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Diffstat (limited to 'contrib/ffmpeg/libavutil/bswap.h')
| -rw-r--r-- | contrib/ffmpeg/libavutil/bswap.h | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavutil/bswap.h b/contrib/ffmpeg/libavutil/bswap.h new file mode 100644 index 000000000..ee75f88c3 --- /dev/null +++ b/contrib/ffmpeg/libavutil/bswap.h @@ -0,0 +1,139 @@ +/* + * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> + * + * 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 bswap.h + * byte swap. + */ + +#ifndef FFMPEG_BSWAP_H +#define FFMPEG_BSWAP_H + +#include <stdint.h> +#include "common.h" + +#ifdef HAVE_BYTESWAP_H +#include <byteswap.h> +#else + +#ifdef ARCH_X86_64 +# define LEGACY_REGS "=Q" +#else +# define LEGACY_REGS "=q" +#endif + +static av_always_inline uint16_t bswap_16(uint16_t x) +{ +#if defined(ARCH_X86) + __asm("rorw $8, %0" : + LEGACY_REGS (x) : + "0" (x)); +#elif defined(ARCH_SH4) + __asm__("swap.b %0,%0":"=r"(x):"0"(x)); +#else + x= (x>>8) | (x<<8); +#endif + return x; +} + +static av_always_inline uint32_t bswap_32(uint32_t x) +{ +#if defined(ARCH_X86) +#if __CPU__ != 386 + __asm("bswap %0": + "=r" (x) : +#else + __asm("xchgb %b0,%h0\n" + "rorl $16,%0 \n" + "xchgb %b0,%h0": + LEGACY_REGS (x) : +#endif + "0" (x)); +#elif defined(ARCH_SH4) + __asm__("swap.b %0,%0\n" + "swap.w %0,%0\n" + "swap.b %0,%0\n" + :"=r"(x):"0"(x)); +#elif defined(ARCH_ARM) + uint32_t t; + __asm__ ("eor %1, %0, %0, ror #16 \n\t" + "bic %1, %1, #0xFF0000 \n\t" + "mov %0, %0, ror #8 \n\t" + "eor %0, %0, %1, lsr #8 \n\t" + : "+r"(x), "+r"(t)); +#elif defined(ARCH_BFIN) + unsigned tmp; + asm("%1 = %0 >> 8 (V); \n\t" + "%0 = %0 << 8 (V); \n\t" + "%0 = %0 | %1; \n\t" + "%0 = PACK(%0.L, %0.H); \n\t" + : "+d"(x), "=&d"(tmp)); +#else + x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF); + x= (x>>16) | (x<<16); +#endif + return x; +} + +static inline uint64_t bswap_64(uint64_t x) +{ +#if 0 + x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL); + x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL); + return (x>>32) | (x<<32); +#elif defined(ARCH_X86_64) + __asm("bswap %0": + "=r" (x) : + "0" (x)); + return x; +#else + union { + uint64_t ll; + uint32_t l[2]; + } w, r; + w.ll = x; + r.l[0] = bswap_32 (w.l[1]); + r.l[1] = bswap_32 (w.l[0]); + return r.ll; +#endif +} + +#endif /* !HAVE_BYTESWAP_H */ + +// be2me ... BigEndian to MachineEndian +// le2me ... LittleEndian to MachineEndian + +#ifdef WORDS_BIGENDIAN +#define be2me_16(x) (x) +#define be2me_32(x) (x) +#define be2me_64(x) (x) +#define le2me_16(x) bswap_16(x) +#define le2me_32(x) bswap_32(x) +#define le2me_64(x) bswap_64(x) +#else +#define be2me_16(x) bswap_16(x) +#define be2me_32(x) bswap_32(x) +#define be2me_64(x) bswap_64(x) +#define le2me_16(x) (x) +#define le2me_32(x) (x) +#define le2me_64(x) (x) +#endif + +#endif /* FFMPEG_BSWAP_H */ |