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patch by Ramiro Polla ramiro lisha ufsc br original thread: date: 03/11/2007 03:06 AM subject: [Ffmpeg-devel] [PATCH] Machine endian bytestream functions Originally committed as revision 8803 to svn://svn.ffmpeg.org/ffmpeg/trunk
133 lines
4.4 KiB
C
133 lines
4.4 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef INTREADWRITE_H
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#define INTREADWRITE_H
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#ifdef __GNUC__
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struct unaligned_64 { uint64_t l; } __attribute__((packed));
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struct unaligned_32 { uint32_t l; } __attribute__((packed));
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struct unaligned_16 { uint16_t l; } __attribute__((packed));
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#define LD16(a) (((const struct unaligned_16 *) (a))->l)
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#define LD32(a) (((const struct unaligned_32 *) (a))->l)
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#define LD64(a) (((const struct unaligned_64 *) (a))->l)
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#define ST16(a, b) (((struct unaligned_16 *) (a))->l) = (b)
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#define ST32(a, b) (((struct unaligned_32 *) (a))->l) = (b)
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#else /* __GNUC__ */
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#define LD16(a) (*((uint16_t*)(a)))
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#define LD32(a) (*((uint32_t*)(a)))
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#define LD64(a) (*((uint64_t*)(a)))
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#define ST16(a, b) *((uint16_t*)(a)) = (b)
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#define ST32(a, b) *((uint32_t*)(a)) = (b)
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#endif /* !__GNUC__ */
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/* endian macros */
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#define AV_RB8(x) (((uint8_t*)(x))[0])
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#define AV_WB8(p, d) { ((uint8_t*)(p))[0] = (d); }
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#define AV_RL8(x) AV_RB8(x)
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#define AV_WL8(p, d) AV_WB8(p, d)
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#ifdef HAVE_FAST_UNALIGNED
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# ifdef WORDS_BIGENDIAN
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# define AV_RB16(x) LD16(x)
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# define AV_WB16(p, d) ST16(p, d)
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# define AV_RL16(x) bswap_16(LD16(x))
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# define AV_WL16(p, d) ST16(p, bswap_16(d))
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# else /* WORDS_BIGENDIAN */
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# define AV_RB16(x) bswap_16(LD16(x))
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# define AV_WB16(p, d) ST16(p, bswap_16(d))
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# define AV_RL16(x) LD16(x)
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# define AV_WL16(p, d) ST16(p, d)
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# endif
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#else /* HAVE_FAST_UNALIGNED */
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#define AV_RB16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
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#define AV_WB16(p, d) { \
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((uint8_t*)(p))[1] = (d); \
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((uint8_t*)(p))[0] = (d)>>8; }
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#define AV_RL16(x) ((((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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#define AV_WL16(p, d) { \
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((uint8_t*)(p))[0] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; }
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#endif
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#define AV_RB24(x) ((((uint8_t*)(x))[0] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[2])
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#define AV_WB24(p, d) { \
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((uint8_t*)(p))[2] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; \
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((uint8_t*)(p))[0] = (d)>>16; }
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#define AV_RL24(x) ((((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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#define AV_WL24(p, d) { \
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((uint8_t*)(p))[0] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; \
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((uint8_t*)(p))[2] = (d)>>16; }
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#ifdef HAVE_FAST_UNALIGNED
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# ifdef WORDS_BIGENDIAN
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# define AV_RB32(x) LD32(x)
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# define AV_WB32(p, d) ST32(p, d)
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# define AV_RL32(x) bswap_32(LD32(x))
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# define AV_WL32(p, d) ST32(p, bswap_32(d))
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# else /* WORDS_BIGENDIAN */
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# define AV_RB32(x) bswap_32(LD32(x))
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# define AV_WB32(p, d) ST32(p, bswap_32(d))
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# define AV_RL32(x) LD32(x)
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# define AV_WL32(p, d) ST32(p, d)
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# endif
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#else /* HAVE_FAST_UNALIGNED */
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#define AV_RB32(x) ((((uint8_t*)(x))[0] << 24) | \
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(((uint8_t*)(x))[1] << 16) | \
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(((uint8_t*)(x))[2] << 8) | \
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((uint8_t*)(x))[3])
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#define AV_WB32(p, d) { \
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((uint8_t*)(p))[3] = (d); \
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((uint8_t*)(p))[2] = (d)>>8; \
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((uint8_t*)(p))[1] = (d)>>16; \
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((uint8_t*)(p))[0] = (d)>>24; }
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#define AV_RL32(x) ((((uint8_t*)(x))[3] << 24) | \
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(((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0])
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#define AV_WL32(p, d) { \
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((uint8_t*)(p))[0] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; \
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((uint8_t*)(p))[2] = (d)>>16; \
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((uint8_t*)(p))[3] = (d)>>24; }
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#endif
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#endif /* INTREADWRITE_H */
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