/* * 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 #if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS#endif #include <errno.h>#include <inttypes.h>#include <limits.h>#include <math.h>#include <stdint.h>#include <stdio.h>#include <stdlib.h>#include <string.h> #include "attributes.h"#include "error.h"#include "macros.h"#include "version.h" #ifdef HAVE_AV_CONFIG_H#   include "config.h"#   include "intmath.h"#   include "internal.h"#else#   include "mem.h"#endif /* HAVE_AV_CONFIG_H */ //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))) /** * Unsigned Absolute value. * This takes the absolute value of a signed int and returns it as a unsigned. * This also works with INT_MIN which would otherwise not be representable * As with many macros, this evaluates its argument twice. */#define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))#define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a)) /* misc math functions */ #ifndef av_ceil_log2#   define av_ceil_log2     av_ceil_log2_c#endif#ifndef av_clip#   define av_clip          av_clip_c#endif#ifndef av_clip64#   define av_clip64        av_clip64_c#endif#ifndef av_clip_uint8#   define av_clip_uint8    av_clip_uint8_c#endif#ifndef av_clip_int8#   define av_clip_int8     av_clip_int8_c#endif#ifndef av_clip_uint16#   define av_clip_uint16   av_clip_uint16_c#endif#ifndef av_clip_int16#   define av_clip_int16    av_clip_int16_c#endif#ifndef av_clipl_int32#   define av_clipl_int32   av_clipl_int32_c#endif#ifndef av_clip_intp2#   define av_clip_intp2    av_clip_intp2_c#endif#ifndef av_clip_uintp2#   define av_clip_uintp2   av_clip_uintp2_c#endif#ifndef av_sat_add32#   define av_sat_add32     av_sat_add32_c#endif#ifndef av_sat_dadd32#   define av_sat_dadd32    av_sat_dadd32_c#endif#ifndef av_sat_sub32#   define av_sat_sub32     av_sat_sub32_c#endif#ifndef av_sat_dsub32#   define av_sat_dsub32    av_sat_dsub32_c#endif#ifndef av_sat_add64#   define av_sat_add64     av_sat_add64_c#endif#ifndef av_sat_sub64#   define av_sat_sub64     av_sat_sub64_c#endif#ifndef av_clipf#   define av_clipf         av_clipf_c#endif#ifndef av_clipd#   define av_clipd         av_clipd_c#endif#ifndef av_zero_extend#   define av_zero_extend   av_zero_extend_c#endif#ifndef av_popcount#   define av_popcount      av_popcount_c#endif#ifndef av_popcount64#   define av_popcount64    av_popcount64_c#endif#ifndef av_parity#   define av_parity        av_parity_c#endif #ifndef av_log2av_const int av_log2(unsigned v);#endif #ifndef av_log2_16bitav_const int av_log2_16bit(unsigned v);#endif /** * Clip a signed integer value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value of the clip range * @return clipped value */static av_always_inline av_const int av_clip_c(int a, int amin, int amax){#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2    if (amin > amax) abort();#endif    if      (a < amin) return amin;    else if (a > amax) return amax;    else               return a;} /** * Clip a signed 64bit integer value into the amin-amax range. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value of the clip range * @return clipped value */static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax){#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2    if (amin > amax) abort();#endif    if      (a < amin) return amin;    else if (a > amax) return amax;    else               return a;} /** * Clip a signed integer value into the 0-255 range. * @param a value to clip * @return clipped value */static av_always_inline av_const uint8_t av_clip_uint8_c(int a){    if (a&(~0xFF)) return (~a)>>31;    else           return a;} /** * Clip a signed integer value into the -128,127 range. * @param a value to clip * @return clipped value */static av_always_inline av_const int8_t av_clip_int8_c(int a){    if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;    else                  return a;} /** * Clip a signed integer value into the 0-65535 range. * @param a value to clip * @return clipped value */static av_always_inline av_const uint16_t av_clip_uint16_c(int a){    if (a&(~0xFFFF)) return (~a)>>31;    else             return a;} /** * Clip a signed integer value into the -32768,32767 range. * @param a value to clip * @return clipped value */static av_always_inline av_const int16_t av_clip_int16_c(int a){    if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;    else                      return a;} /** * Clip a signed 64-bit integer value into the -2147483648,2147483647 range. * @param a value to clip * @return clipped value */static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a){    if ((a+UINT64_C(0x80000000)) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);    else                                                  return (int32_t)a;} /** * Clip a signed integer into the -(2^p),(2^p-1) range. * @param  a value to clip * @param  p bit position to clip at * @return clipped value */static av_always_inline av_const int av_clip_intp2_c(int a, int p){    if (((unsigned)a + (1U << p)) & ~((2U << p) - 1))        return (a >> 31) ^ ((1 << p) - 1);    else        return a;} /** * Clip a signed integer to an unsigned power of two range. * @param  a value to clip * @param  p bit position to clip at * @return clipped value */static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p){    if (a & ~((1U<<p) - 1)) return (~a) >> 31 & ((1U<<p) - 1);    else                    return  a;} /** * Clear high bits from an unsigned integer starting with specific bit position * @param  a value to clip * @param  p bit position to clip at. Must be between 0 and 31. * @return clipped value */static av_always_inline av_const unsigned av_zero_extend_c(unsigned a, unsigned p){#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2    if (p > 31) abort();#endif    return a & ((1U << p) - 1);} #if FF_API_MOD_UINTP2#ifndef av_mod_uintp2#   define av_mod_uintp2 av_mod_uintp2_c#endifattribute_deprecatedstatic av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p){    return av_zero_extend_c(a, p);}#endif /** * Add two signed 32-bit values with saturation. * * @param  a one value * @param  b another value * @return sum with signed saturation */static av_always_inline int av_sat_add32_c(int a, int b){    return av_clipl_int32((int64_t)a + b);} /** * Add a doubled value to another value with saturation at both stages. * * @param  a first value * @param  b value doubled and added to a * @return sum sat(a + sat(2*b)) with signed saturation */static av_always_inline int av_sat_dadd32_c(int a, int b){    return av_sat_add32(a, av_sat_add32(b, b));} /** * Subtract two signed 32-bit values with saturation. * * @param  a one value * @param  b another value * @return difference with signed saturation */static av_always_inline int av_sat_sub32_c(int a, int b){    return av_clipl_int32((int64_t)a - b);} /** * Subtract a doubled value from another value with saturation at both stages. * * @param  a first value * @param  b value doubled and subtracted from a * @return difference sat(a - sat(2*b)) with signed saturation */static av_always_inline int av_sat_dsub32_c(int a, int b){    return av_sat_sub32(a, av_sat_add32(b, b));} /** * Add two signed 64-bit values with saturation. * * @param  a one value * @param  b another value * @return sum with signed saturation */static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)    int64_t tmp;    return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);#else    int64_t s = a+(uint64_t)b;    if ((int64_t)(a^b | ~s^b) >= 0)        return INT64_MAX ^ (b >> 63);    return s;#endif} /** * Subtract two signed 64-bit values with saturation. * * @param  a one value * @param  b another value * @return difference with signed saturation */static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)    int64_t tmp;    return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);#else    if (b <= 0 && a >= INT64_MAX + b)        return INT64_MAX;    if (b >= 0 && a <= INT64_MIN + b)        return INT64_MIN;    return a - b;#endif} /** * Clip a float value into the amin-amax range. * If a is nan or -inf amin will be returned. * If a is +inf amax will be returned. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value of the clip range * @return clipped value */static av_always_inline av_const float av_clipf_c(float a, float amin, float amax){#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2    if (amin > amax) abort();#endif    return FFMIN(FFMAX(a, amin), amax);} /** * Clip a double value into the amin-amax range. * If a is nan or -inf amin will be returned. * If a is +inf amax will be returned. * @param a value to clip * @param amin minimum value of the clip range * @param amax maximum value of the clip range * @return clipped value */static av_always_inline av_const double av_clipd_c(double a, double amin, double amax){#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2    if (amin > amax) abort();#endif    return FFMIN(FFMAX(a, amin), amax);} /** Compute ceil(log2(x)). * @param x value used to compute ceil(log2(x)) * @return computed ceiling of log2(x) */static av_always_inline av_const int av_ceil_log2_c(int x){    return av_log2((x - 1U) << 1);} /** * Count number of bits set to one in x * @param x value to count bits of * @return the number of bits set to one in x */static av_always_inline av_const int av_popcount_c(uint32_t x){    x -= (x >> 1) & 0x55555555;    x = (x & 0x33333333) + ((x >> 2) & 0x33333333);    x = (x + (x >> 4)) & 0x0F0F0F0F;    x += x >> 8;    return (x + (x >> 16)) & 0x3F;} /** * Count number of bits set to one in x * @param x value to count bits of * @return the number of bits set to one in x */static av_always_inline av_const int av_popcount64_c(uint64_t x){    return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));} static av_always_inline av_const int av_parity_c(uint32_t v){    return av_popcount(v) & 1;} /** * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form. * * @param val      Output value, must be an lvalue of type uint32_t. * @param GET_BYTE Expression reading one byte from the input. *                 Evaluated up to 7 times (4 for the currently *                 assigned Unicode range).  With a memory buffer *                 input, this could be *ptr++, or if you want to make sure *                 that *ptr stops at the end of a NULL terminated string then *                 *ptr ? *ptr++ : 0 * @param ERROR    Expression to be evaluated on invalid input, *                 typically a goto statement. * * @warning ERROR should not contain a loop control statement which * could interact with the internal while loop, and should force an * exit from the macro code (e.g. through a goto or a return) in order * to prevent undefined results. */#define GET_UTF8(val, GET_BYTE, ERROR)\    val= (GET_BYTE);\    {\        uint32_t top = (val & 128) >> 1;\        if ((val & 0xc0) == 0x80 || val >= 0xFE)\            {ERROR}\        while (val & top) {\            unsigned int tmp = (GET_BYTE) - 128;\            if(tmp>>6)\                {ERROR}\            val= (val<<6) + tmp;\            top <<= 5;\        }\

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