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      1 /*
      2  * copyright (c) 2006 Michael Niedermayer <michaelni (at) gmx.at>
      3  *
      4  * This file is part of FFmpeg.
      5  *
      6  * FFmpeg is free software; you can redistribute it and/or
      7  * modify it under the terms of the GNU Lesser General Public
      8  * License as published by the Free Software Foundation; either
      9  * version 2.1 of the License, or (at your option) any later version.
     10  *
     11  * FFmpeg is distributed in the hope that it will be useful,
     12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     14  * Lesser General Public License for more details.
     15  *
     16  * You should have received a copy of the GNU Lesser General Public
     17  * License along with FFmpeg; if not, write to the Free Software
     18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
     19  */
     20 
     21 /**
     22  * @file
     23  * byte swapping routines
     24  */
     25 
     26 #ifndef AVUTIL_BSWAP_H
     27 #define AVUTIL_BSWAP_H
     28 
     29 #include <stdint.h>
     30 #include "libavutil/avconfig.h"
     31 #include "attributes.h"
     32 
     33 #ifdef HAVE_AV_CONFIG_H
     34 
     35 #include "config.h"
     36 
     37 #if   ARCH_ARM
     38 #   include "arm/bswap.h"
     39 #elif ARCH_AVR32
     40 #   include "avr32/bswap.h"
     41 #elif ARCH_BFIN
     42 #   include "bfin/bswap.h"
     43 #elif ARCH_SH4
     44 #   include "sh4/bswap.h"
     45 #elif ARCH_X86
     46 #   include "x86/bswap.h"
     47 #endif
     48 
     49 #endif /* HAVE_AV_CONFIG_H */
     50 
     51 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
     52 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
     53 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
     54 
     55 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
     56 
     57 #ifndef av_bswap16
     58 static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
     59 {
     60     x= (x>>8) | (x<<8);
     61     return x;
     62 }
     63 #endif
     64 
     65 #ifndef av_bswap32
     66 static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
     67 {
     68     return AV_BSWAP32C(x);
     69 }
     70 #endif
     71 
     72 #ifndef av_bswap64
     73 static inline uint64_t av_const av_bswap64(uint64_t x)
     74 {
     75     return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
     76 }
     77 #endif
     78 
     79 // be2ne ... big-endian to native-endian
     80 // le2ne ... little-endian to native-endian
     81 
     82 #if AV_HAVE_BIGENDIAN
     83 #define av_be2ne16(x) (x)
     84 #define av_be2ne32(x) (x)
     85 #define av_be2ne64(x) (x)
     86 #define av_le2ne16(x) av_bswap16(x)
     87 #define av_le2ne32(x) av_bswap32(x)
     88 #define av_le2ne64(x) av_bswap64(x)
     89 #define AV_BE2NEC(s, x) (x)
     90 #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
     91 #else
     92 #define av_be2ne16(x) av_bswap16(x)
     93 #define av_be2ne32(x) av_bswap32(x)
     94 #define av_be2ne64(x) av_bswap64(x)
     95 #define av_le2ne16(x) (x)
     96 #define av_le2ne32(x) (x)
     97 #define av_le2ne64(x) (x)
     98 #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
     99 #define AV_LE2NEC(s, x) (x)
    100 #endif
    101 
    102 #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
    103 #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
    104 #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
    105 #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
    106 #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
    107 #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
    108 
    109 #endif /* AVUTIL_BSWAP_H */
    110