luban-lite-t3e-pro/packages/third-party/ffmpeg/libavutil/common.h

/*
 * 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
 * common internal and external API header
 */

#ifndef AVUTIL_COMMON_H
#define AVUTIL_COMMON_H

#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


#if AV_HAVE_BIGENDIAN
#   define AV_NE(be, le) (be)
#else
#   define AV_NE(be, le) (le)
#endif

//rounded division & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
/* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
/* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
#define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
                                                       : ((a) + (1<<(b)) - 1) >> (b))
/* Backwards compat. */
#define FF_CEIL_RSHIFT AV_CEIL_RSHIFT

#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))

/**
 * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
 * are not representable as absolute values of their type. This is the same
 * as with *abs()
 * @see FFNABS()
 */
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFSIGN(a) ((a) > 0 ? 1 : -1)

/**
 * Negative Absolute value.
 * this works for all integers of all types.
 * As with many macros, this evaluates its argument twice, it thus must not have
 * a sideeffect, that is FFNABS(x++) has undefined behavior.
 */
#define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))

/**
 * Comparator.
 * For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0
 * if x == y. This is useful for instance in a qsort comparator callback.
 * Furthermore, compilers are able to optimize this to branchless code, and
 * there is no risk of overflow with signed types.
 * As with many macros, this evaluates its argument multiple times, it thus
 * must not have a side-effect.
 */
#define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))

#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)

#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))


#define AAC_RENAME(x)       x
typedef float               INTFLOAT;

#endif