bswap.h 3.14 KB
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/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
 * 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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 * Libav is distributed in the hope that it will be useful,
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 * 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
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 * License along with Libav; 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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 * @file
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 * byte swapping routines
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 */

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#ifndef AVUTIL_BSWAP_H
#define AVUTIL_BSWAP_H
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#include <stdint.h>
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#include "libavutil/avconfig.h"
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#include "attributes.h"
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#ifdef HAVE_AV_CONFIG_H

#include "config.h"

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#if   ARCH_ARM
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#   include "arm/bswap.h"
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#elif ARCH_AVR32
#   include "avr32/bswap.h"
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#elif ARCH_BFIN
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#   include "bfin/bswap.h"
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#elif ARCH_SH4
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#   include "sh4/bswap.h"
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#elif ARCH_X86
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#   include "x86/bswap.h"
#endif

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#endif /* HAVE_AV_CONFIG_H */

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#define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
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#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
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#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)

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#ifndef av_bswap16
static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
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{
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    x= (x>>8) | (x<<8);
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    return x;
}
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#endif
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#ifndef av_bswap32
static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
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{
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    x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
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    x= (x>>16) | (x<<16);
    return x;
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}
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#endif
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#ifndef av_bswap64
static inline uint64_t av_const av_bswap64(uint64_t x)
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{
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#if 0
    x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
    x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
    return (x>>32) | (x<<32);
#else
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    union {
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        uint64_t ll;
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        uint32_t l[2];
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    } w, r;
    w.ll = x;
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    r.l[0] = av_bswap32 (w.l[1]);
    r.l[1] = av_bswap32 (w.l[0]);
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    return r.ll;
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#endif
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}
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#endif
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// be2ne ... big-endian to native-endian
// le2ne ... little-endian to native-endian
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#if AV_HAVE_BIGENDIAN
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#define av_be2ne16(x) (x)
#define av_be2ne32(x) (x)
#define av_be2ne64(x) (x)
#define av_le2ne16(x) av_bswap16(x)
#define av_le2ne32(x) av_bswap32(x)
#define av_le2ne64(x) av_bswap64(x)
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#define AV_BE2NEC(s, x) (x)
#define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
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#else
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#define av_be2ne16(x) av_bswap16(x)
#define av_be2ne32(x) av_bswap32(x)
#define av_be2ne64(x) av_bswap64(x)
#define av_le2ne16(x) (x)
#define av_le2ne32(x) (x)
#define av_le2ne64(x) (x)
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#define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
#define AV_LE2NEC(s, x) (x)
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#endif

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#define AV_BE2NE16C(x) AV_BE2NEC(16, x)
#define AV_BE2NE32C(x) AV_BE2NEC(32, x)
#define AV_BE2NE64C(x) AV_BE2NEC(64, x)
#define AV_LE2NE16C(x) AV_LE2NEC(16, x)
#define AV_LE2NE32C(x) AV_LE2NEC(32, x)
#define AV_LE2NE64C(x) AV_LE2NEC(64, x)
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#endif /* AVUTIL_BSWAP_H */