50078c1c80
Include macros.h explicitly in common.h so that external code using FFALIGN does not break. It was already implicitly included through version.h. Include macros.h in lls.h and internal.h for FFALIGN. lls.h was including common.h only for FFALIGN and internal.h was missing the include for FFALIGN. `make checkheaders` did not catch it because it's an internal header.
420 lines
12 KiB
C
420 lines
12 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common internal and external API header
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*/
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#ifndef AVUTIL_COMMON_H
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#define AVUTIL_COMMON_H
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "attributes.h"
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#include "macros.h"
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#include "version.h"
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#include "libavutil/avconfig.h"
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#if AV_HAVE_BIGENDIAN
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# define AV_NE(be, le) (be)
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#else
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# define AV_NE(be, le) (le)
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#endif
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//rounded division & shift
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#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
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/* assume b>0 */
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#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
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#define FFSIGN(a) ((a) > 0 ? 1 : -1)
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#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
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#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
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#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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/* misc math functions */
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#ifdef HAVE_AV_CONFIG_H
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# include "config.h"
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# include "intmath.h"
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#endif
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/* Pull in unguarded fallback defines at the end of this file. */
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#include "common.h"
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#ifndef av_log2
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av_const int av_log2(unsigned v);
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#endif
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#ifndef av_log2_16bit
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av_const int av_log2_16bit(unsigned v);
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#endif
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/**
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* Clip a signed integer value into the amin-amax range.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
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{
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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/**
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* Clip a signed integer value into the 0-255 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
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{
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if (a&(~0xFF)) return (-a)>>31;
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else return a;
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}
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/**
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* Clip a signed integer value into the -128,127 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int8_t av_clip_int8_c(int a)
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{
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if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
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else return a;
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}
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/**
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* Clip a signed integer value into the 0-65535 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
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{
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if (a&(~0xFFFF)) return (-a)>>31;
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else return a;
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}
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/**
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* Clip a signed integer value into the -32768,32767 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int16_t av_clip_int16_c(int a)
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{
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if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
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else return a;
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}
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/**
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* Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
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{
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if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;
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else return a;
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}
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/**
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* Clip a signed integer into the -(2^p),(2^p-1) range.
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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static av_always_inline av_const int av_clip_intp2_c(int a, int p)
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{
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if ((a + (1 << p)) & ~((1 << (p + 1)) - 1))
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return (a >> 31) ^ ((1 << p) - 1);
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else
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return a;
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}
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/**
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* Clip a signed integer to an unsigned power of two range.
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
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{
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if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
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else return a;
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}
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/**
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* Add two signed 32-bit values with saturation.
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*
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* @param a one value
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* @param b another value
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* @return sum with signed saturation
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*/
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static av_always_inline int av_sat_add32_c(int a, int b)
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{
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return av_clipl_int32((int64_t)a + b);
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}
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/**
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* Add a doubled value to another value with saturation at both stages.
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*
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* @param a first value
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* @param b value doubled and added to a
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* @return sum with signed saturation
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*/
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static av_always_inline int av_sat_dadd32_c(int a, int b)
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{
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return av_sat_add32(a, av_sat_add32(b, b));
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}
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/**
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* Clip a float value into the amin-amax range.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
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{
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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/** Compute ceil(log2(x)).
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* @param x value used to compute ceil(log2(x))
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* @return computed ceiling of log2(x)
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*/
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static av_always_inline av_const int av_ceil_log2_c(int x)
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{
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return av_log2((x - 1) << 1);
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}
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/**
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* Count number of bits set to one in x
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* @param x value to count bits of
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* @return the number of bits set to one in x
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*/
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static av_always_inline av_const int av_popcount_c(uint32_t x)
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{
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x -= (x >> 1) & 0x55555555;
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x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
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x = (x + (x >> 4)) & 0x0F0F0F0F;
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x += x >> 8;
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return (x + (x >> 16)) & 0x3F;
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}
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/**
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* Count number of bits set to one in x
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* @param x value to count bits of
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* @return the number of bits set to one in x
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*/
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static av_always_inline av_const int av_popcount64_c(uint64_t x)
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{
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return av_popcount(x) + av_popcount(x >> 32);
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}
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#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
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#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
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/**
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* Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
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*
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* @param val Output value, must be an lvalue of type uint32_t.
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* @param GET_BYTE Expression reading one byte from the input.
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* Evaluated up to 7 times (4 for the currently
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* assigned Unicode range). With a memory buffer
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* input, this could be *ptr++.
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* @param ERROR Expression to be evaluated on invalid input,
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* typically a goto statement.
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*/
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#define GET_UTF8(val, GET_BYTE, ERROR)\
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val= GET_BYTE;\
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{\
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uint32_t top = (val & 128) >> 1;\
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if ((val & 0xc0) == 0x80)\
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ERROR\
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while (val & top) {\
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int tmp= GET_BYTE - 128;\
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if(tmp>>6)\
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ERROR\
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val= (val<<6) + tmp;\
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top <<= 5;\
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}\
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val &= (top << 1) - 1;\
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}
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/**
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* Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
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*
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* @param val Output value, must be an lvalue of type uint32_t.
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* @param GET_16BIT Expression returning two bytes of UTF-16 data converted
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* to native byte order. Evaluated one or two times.
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* @param ERROR Expression to be evaluated on invalid input,
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* typically a goto statement.
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*/
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#define GET_UTF16(val, GET_16BIT, ERROR)\
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val = GET_16BIT;\
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{\
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unsigned int hi = val - 0xD800;\
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if (hi < 0x800) {\
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val = GET_16BIT - 0xDC00;\
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if (val > 0x3FFU || hi > 0x3FFU)\
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ERROR\
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val += (hi<<10) + 0x10000;\
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}\
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}\
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/**
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* @def PUT_UTF8(val, tmp, PUT_BYTE)
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* Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
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* @param val is an input-only argument and should be of type uint32_t. It holds
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* a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
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* val is given as a function it is executed only once.
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* @param tmp is a temporary variable and should be of type uint8_t. It
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* represents an intermediate value during conversion that is to be
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* output by PUT_BYTE.
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* @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
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* It could be a function or a statement, and uses tmp as the input byte.
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* For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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* executed up to 4 times for values in the valid UTF-8 range and up to
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* 7 times in the general case, depending on the length of the converted
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* Unicode character.
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*/
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#define PUT_UTF8(val, tmp, PUT_BYTE)\
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{\
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int bytes, shift;\
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uint32_t in = val;\
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if (in < 0x80) {\
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tmp = in;\
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PUT_BYTE\
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} else {\
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bytes = (av_log2(in) + 4) / 5;\
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shift = (bytes - 1) * 6;\
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tmp = (256 - (256 >> bytes)) | (in >> shift);\
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PUT_BYTE\
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while (shift >= 6) {\
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shift -= 6;\
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tmp = 0x80 | ((in >> shift) & 0x3f);\
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PUT_BYTE\
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}\
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}\
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}
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/**
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* @def PUT_UTF16(val, tmp, PUT_16BIT)
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* Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
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* @param val is an input-only argument and should be of type uint32_t. It holds
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* a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
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* val is given as a function it is executed only once.
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* @param tmp is a temporary variable and should be of type uint16_t. It
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* represents an intermediate value during conversion that is to be
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* output by PUT_16BIT.
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* @param PUT_16BIT writes the converted UTF-16 data to any proper destination
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* in desired endianness. It could be a function or a statement, and uses tmp
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* as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
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* PUT_BYTE will be executed 1 or 2 times depending on input character.
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*/
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#define PUT_UTF16(val, tmp, PUT_16BIT)\
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{\
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uint32_t in = val;\
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if (in < 0x10000) {\
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tmp = in;\
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PUT_16BIT\
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} else {\
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tmp = 0xD800 | ((in - 0x10000) >> 10);\
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PUT_16BIT\
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tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
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PUT_16BIT\
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}\
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}\
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#include "mem.h"
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#ifdef HAVE_AV_CONFIG_H
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# include "internal.h"
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#endif /* HAVE_AV_CONFIG_H */
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#endif /* AVUTIL_COMMON_H */
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/*
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* The following definitions are outside the multiple inclusion guard
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* to ensure they are immediately available in intmath.h.
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*/
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#ifndef av_ceil_log2
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# define av_ceil_log2 av_ceil_log2_c
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#endif
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#ifndef av_clip
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# define av_clip av_clip_c
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#endif
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#ifndef av_clip_uint8
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# define av_clip_uint8 av_clip_uint8_c
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#endif
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#ifndef av_clip_int8
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# define av_clip_int8 av_clip_int8_c
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#endif
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#ifndef av_clip_uint16
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# define av_clip_uint16 av_clip_uint16_c
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#endif
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#ifndef av_clip_int16
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# define av_clip_int16 av_clip_int16_c
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#endif
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#ifndef av_clipl_int32
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# define av_clipl_int32 av_clipl_int32_c
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#endif
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#ifndef av_clip_intp2
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# define av_clip_intp2 av_clip_intp2_c
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#endif
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#ifndef av_clip_uintp2
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# define av_clip_uintp2 av_clip_uintp2_c
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#endif
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#ifndef av_sat_add32
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# define av_sat_add32 av_sat_add32_c
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#endif
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#ifndef av_sat_dadd32
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# define av_sat_dadd32 av_sat_dadd32_c
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#endif
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#ifndef av_clipf
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# define av_clipf av_clipf_c
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#endif
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#ifndef av_popcount
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# define av_popcount av_popcount_c
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#endif
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#ifndef av_popcount64
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# define av_popcount64 av_popcount64_c
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#endif
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