PeerStreamer

/*

 * 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 */