/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file bswap.h
- * byte swap.
+ * @file
+ * byte swapping routines
*/
-#ifndef __BSWAP_H__
-#define __BSWAP_H__
+#ifndef AVUTIL_BSWAP_H
+#define AVUTIL_BSWAP_H
+
+#include <stdint.h>
+#include "libavutil/avconfig.h"
+#include "attributes.h"
+
+#ifdef HAVE_AV_CONFIG_H
+
+#include "config.h"
+
+#if ARCH_AARCH64
+# include "aarch64/bswap.h"
+#elif ARCH_ARM
+# include "arm/bswap.h"
+#elif ARCH_AVR32
+# include "avr32/bswap.h"
+#elif ARCH_BFIN
+# include "bfin/bswap.h"
+#elif ARCH_SH4
+# include "sh4/bswap.h"
+#elif ARCH_X86
+# include "x86/bswap.h"
+#endif
-#ifdef HAVE_BYTESWAP_H
-#include <byteswap.h>
-#else
+#endif /* HAVE_AV_CONFIG_H */
-#ifdef ARCH_X86_64
-# define LEGACY_REGS "=Q"
-#else
-# define LEGACY_REGS "=q"
-#endif
+#define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff))
+#define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
+#define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
+
+#define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
-#if defined(ARCH_X86) || defined(ARCH_X86_64)
-static always_inline uint16_t bswap_16(uint16_t x)
+#ifndef av_bswap16
+static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
{
- __asm("rorw $8, %0" :
- LEGACY_REGS (x) :
- "0" (x));
+ x= (x>>8) | (x<<8);
return x;
}
-
-static always_inline uint32_t bswap_32(uint32_t x)
-{
-#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));
- return x;
-}
-static inline uint64_t bswap_64(uint64_t x)
+#ifndef av_bswap32
+static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
{
-#ifdef ARCH_X86_64
- __asm("bswap %0":
- "=r" (x) :
- "0" (x));
- return x;
-#else
- union {
- uint64_t ll;
- struct {
- uint32_t l,h;
- } l;
- } r;
- r.l.l = bswap_32 (x);
- r.l.h = bswap_32 (x>>32);
- return r.ll;
-#endif
-}
-
-#elif defined(ARCH_SH4)
-
-static always_inline uint16_t bswap_16(uint16_t x) {
- __asm__("swap.b %0,%0":"=r"(x):"0"(x));
- return x;
-}
-
-static always_inline uint32_t bswap_32(uint32_t x) {
- __asm__(
- "swap.b %0,%0\n"
- "swap.w %0,%0\n"
- "swap.b %0,%0\n"
- :"=r"(x):"0"(x));
- return x;
+ return AV_BSWAP32C(x);
}
+#endif
-static inline uint64_t bswap_64(uint64_t x)
+#ifndef av_bswap64
+static inline uint64_t av_const av_bswap64(uint64_t x)
{
- union {
- uint64_t ll;
- struct {
- uint32_t l,h;
- } l;
- } r;
- r.l.l = bswap_32 (x);
- r.l.h = bswap_32 (x>>32);
- return r.ll;
-}
-#else
-
-static always_inline uint16_t bswap_16(uint16_t x){
- return (x>>8) | (x<<8);
-}
-
-#ifdef ARCH_ARM
-static always_inline uint32_t bswap_32(uint32_t x){
- 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));
- return x;
-}
-#else
-static always_inline uint32_t bswap_32(uint32_t x){
- x= ((x<<8)&0xFF00FF00) | ((x>>8)&0x00FF00FF);
- return (x>>16) | (x<<16);
+ return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
}
#endif
-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);
+// be2ne ... big-endian to native-endian
+// le2ne ... little-endian to native-endian
+
+#if AV_HAVE_BIGENDIAN
+#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)
+#define AV_BE2NEC(s, x) (x)
+#define AV_LE2NEC(s, x) AV_BSWAPC(s, 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;
+#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)
+#define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
+#define AV_LE2NEC(s, x) (x)
#endif
-}
-#endif /* !ARCH_X86 */
-#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
+#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)
-#endif /* __BSWAP_H__ */
+#endif /* AVUTIL_BSWAP_H */