mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
128 lines
3.2 KiB
128 lines
3.2 KiB
/* |
|
* 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 swapping routines |
|
*/ |
|
|
|
#ifndef FFMPEG_BSWAP_H |
|
#define FFMPEG_BSWAP_H |
|
|
|
#include <stdint.h> |
|
#include "config.h" |
|
#include "common.h" |
|
|
|
#ifdef HAVE_BYTESWAP_H |
|
#include <byteswap.h> |
|
#else |
|
|
|
static av_always_inline av_const uint16_t bswap_16(uint16_t x) |
|
{ |
|
#if defined(ARCH_X86) |
|
asm("rorw $8, %0" : "+r"(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 av_const uint32_t bswap_32(uint32_t x) |
|
{ |
|
#if defined(ARCH_X86) |
|
#ifdef HAVE_BSWAP |
|
asm("bswap %0" : "+r" (x)); |
|
#else |
|
asm("rorw $8, %w0 \n\t" |
|
"rorl $16, %0 \n\t" |
|
"rorw $8, %w0" |
|
: "+r"(x)); |
|
#endif |
|
#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 av_const 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 */
|
|
|