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libavutil/bswap.h

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00001 /*
00002  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #ifndef AVUTIL_BSWAP_H
00027 #define AVUTIL_BSWAP_H
00028 
00029 #include <stdint.h>
00030 #include "config.h"
00031 #include "attributes.h"
00032 
00033 #if   ARCH_ARM
00034 #   include "arm/bswap.h"
00035 #elif ARCH_AVR32
00036 #   include "avr32/bswap.h"
00037 #elif ARCH_BFIN
00038 #   include "bfin/bswap.h"
00039 #elif ARCH_SH4
00040 #   include "sh4/bswap.h"
00041 #elif ARCH_X86
00042 #   include "x86/bswap.h"
00043 #endif
00044 
00045 #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
00046 #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
00047 #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
00048 
00049 #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
00050 
00051 #ifndef bswap_16
00052 static av_always_inline av_const uint16_t bswap_16(uint16_t x)
00053 {
00054     x= (x>>8) | (x<<8);
00055     return x;
00056 }
00057 #endif
00058 
00059 #ifndef bswap_32
00060 static av_always_inline av_const uint32_t bswap_32(uint32_t x)
00061 {
00062     x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
00063     x= (x>>16) | (x<<16);
00064     return x;
00065 }
00066 #endif
00067 
00068 #ifndef bswap_64
00069 static inline uint64_t av_const bswap_64(uint64_t x)
00070 {
00071 #if 0
00072     x= ((x<< 8)&0xFF00FF00FF00FF00ULL) | ((x>> 8)&0x00FF00FF00FF00FFULL);
00073     x= ((x<<16)&0xFFFF0000FFFF0000ULL) | ((x>>16)&0x0000FFFF0000FFFFULL);
00074     return (x>>32) | (x<<32);
00075 #else
00076     union {
00077         uint64_t ll;
00078         uint32_t l[2];
00079     } w, r;
00080     w.ll = x;
00081     r.l[0] = bswap_32 (w.l[1]);
00082     r.l[1] = bswap_32 (w.l[0]);
00083     return r.ll;
00084 #endif
00085 }
00086 #endif
00087 
00088 // be2me ... big-endian to machine-endian
00089 // le2me ... little-endian to machine-endian
00090 
00091 #if HAVE_BIGENDIAN
00092 #define be2me_16(x) (x)
00093 #define be2me_32(x) (x)
00094 #define be2me_64(x) (x)
00095 #define le2me_16(x) bswap_16(x)
00096 #define le2me_32(x) bswap_32(x)
00097 #define le2me_64(x) bswap_64(x)
00098 #define AV_BE2MEC(s, x) (x)
00099 #define AV_LE2MEC(s, x) AV_BSWAPC(s, x)
00100 #else
00101 #define be2me_16(x) bswap_16(x)
00102 #define be2me_32(x) bswap_32(x)
00103 #define be2me_64(x) bswap_64(x)
00104 #define le2me_16(x) (x)
00105 #define le2me_32(x) (x)
00106 #define le2me_64(x) (x)
00107 #define AV_BE2MEC(s, x) AV_BSWAPC(s, x)
00108 #define AV_LE2MEC(s, x) (x)
00109 #endif
00110 
00111 #define AV_BE2ME16C(x) AV_BE2MEC(16, x)
00112 #define AV_BE2ME32C(x) AV_BE2MEC(32, x)
00113 #define AV_BE2ME64C(x) AV_BE2MEC(64, x)
00114 #define AV_LE2ME16C(x) AV_LE2MEC(16, x)
00115 #define AV_LE2ME32C(x) AV_LE2MEC(32, x)
00116 #define AV_LE2ME64C(x) AV_LE2MEC(64, x)
00117 
00118 #endif /* AVUTIL_BSWAP_H */

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