FFmpeg: libavutil/internal.h Source File

00001 /*
00002  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of FFmpeg.
00005  *
00006  * FFmpeg is free software; you can redistribute it and/or
00007  * modify it under the terms of the GNU Lesser General Public
00008  * License as published by the Free Software Foundation; either
00009  * version 2.1 of the License, or (at your option) any later version.
00010  *
00011  * FFmpeg is distributed in the hope that it will be useful,
00012  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00013  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014  * Lesser General Public License for more details.
00015  *
00016  * You should have received a copy of the GNU Lesser General Public
00017  * License along with FFmpeg; if not, write to the Free Software
00018  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00019  */
00020 
00026 #ifndef AVUTIL_INTERNAL_H
00027 #define AVUTIL_INTERNAL_H
00028 
00029 #if !defined(DEBUG) && !defined(NDEBUG)
00030 #    define NDEBUG
00031 #endif
00032 
00033 #include <limits.h>
00034 #include <stdint.h>
00035 #include <stddef.h>
00036 #include <assert.h>
00037 #include "config.h"
00038 #include "attributes.h"
00039 #include "timer.h"
00040 
00041 #ifndef attribute_align_arg
00042 #if ARCH_X86_32 && (!defined(__ICC) || __ICC > 1200) && AV_GCC_VERSION_AT_LEAST(4,2)
00043 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
00044 #else
00045 #    define attribute_align_arg
00046 #endif
00047 #endif
00048 
00049 
00055 #ifndef attribute_used
00056 #if AV_GCC_VERSION_AT_LEAST(3,1)
00057 #    define attribute_used __attribute__((used))
00058 #else
00059 #    define attribute_used
00060 #endif
00061 #endif
00062 
00063 #ifndef INT16_MIN
00064 #define INT16_MIN       (-0x7fff - 1)
00065 #endif
00066 
00067 #ifndef INT16_MAX
00068 #define INT16_MAX       0x7fff
00069 #endif
00070 
00071 #ifndef INT32_MIN
00072 #define INT32_MIN       (-0x7fffffff - 1)
00073 #endif
00074 
00075 #ifndef INT32_MAX
00076 #define INT32_MAX       0x7fffffff
00077 #endif
00078 
00079 #ifndef UINT32_MAX
00080 #define UINT32_MAX      0xffffffff
00081 #endif
00082 
00083 #ifndef INT64_MIN
00084 #define INT64_MIN       (-0x7fffffffffffffffLL - 1)
00085 #endif
00086 
00087 #ifndef INT64_MAX
00088 #define INT64_MAX INT64_C(9223372036854775807)
00089 #endif
00090 
00091 #ifndef UINT64_MAX
00092 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
00093 #endif
00094 
00095 #ifndef INT_BIT
00096 #    define INT_BIT (CHAR_BIT * sizeof(int))
00097 #endif
00098 
00099 #ifndef offsetof
00100 #    define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
00101 #endif
00102 
00103 /* Use to export labels from asm. */
00104 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
00105 
00106 // Use rip-relative addressing if compiling PIC code on x86-64.
00107 #if ARCH_X86_64 && defined(PIC)
00108 #    define LOCAL_MANGLE(a) #a "(%%rip)"
00109 #else
00110 #    define LOCAL_MANGLE(a) #a
00111 #endif
00112 
00113 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
00114 
00115 /* debug stuff */
00116 
00117 /* dprintf macros */
00118 #ifdef DEBUG
00119 #    define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
00120 #else
00121 #    define dprintf(pctx, ...)
00122 #endif
00123 
00124 #define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
00125 
00126 /* math */
00127 
00128 #if ARCH_X86
00129 #define MASK_ABS(mask, level)\
00130             __asm__ volatile(\
00131                 "cltd                   \n\t"\
00132                 "xorl %1, %0            \n\t"\
00133                 "subl %1, %0            \n\t"\
00134                 : "+a" (level), "=&d" (mask)\
00135             );
00136 #else
00137 #define MASK_ABS(mask, level)\
00138             mask  = level >> 31;\
00139             level = (level ^ mask) - mask;
00140 #endif
00141 
00142 /* avoid usage of dangerous/inappropriate system functions */
00143 #undef  malloc
00144 #define malloc please_use_av_malloc
00145 #undef  free
00146 #define free please_use_av_free
00147 #undef  realloc
00148 #define realloc please_use_av_realloc
00149 #undef  time
00150 #define time time_is_forbidden_due_to_security_issues
00151 #undef  rand
00152 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
00153 #undef  srand
00154 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
00155 #undef  random
00156 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
00157 #undef  sprintf
00158 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
00159 #undef  strcat
00160 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
00161 #undef  exit
00162 #define exit exit_is_forbidden
00163 #ifndef LIBAVFORMAT_BUILD
00164 #undef  printf
00165 #define printf please_use_av_log_instead_of_printf
00166 #undef  fprintf
00167 #define fprintf please_use_av_log_instead_of_fprintf
00168 #undef  puts
00169 #define puts please_use_av_log_instead_of_puts
00170 #undef  perror
00171 #define perror please_use_av_log_instead_of_perror
00172 #endif
00173 
00174 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
00175 {\
00176     p = av_malloc(size);\
00177     if (p == NULL && (size) != 0) {\
00178         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
00179         goto label;\
00180     }\
00181 }
00182 
00183 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
00184 {\
00185     p = av_mallocz(size);\
00186     if (p == NULL && (size) != 0) {\
00187         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
00188         goto label;\
00189     }\
00190 }
00191 
00192 #include "libm.h"
00193 
00199 #if CONFIG_SMALL
00200 #   define NULL_IF_CONFIG_SMALL(x) NULL
00201 #else
00202 #   define NULL_IF_CONFIG_SMALL(x) x
00203 #endif
00204 
00205 
00223 #if HAVE_SYMVER_ASM_LABEL
00224 #   define FF_SYMVER(type, name, args, ver)                     \
00225     type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
    type ff_##name args
#elif HAVE_SYMVER_GNU_ASM
#   define FF_SYMVER(type, name, args, ver)                             \
    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
    type ff_##name args;                                                \
    type ff_##name args
#endif

#endif /* AVUTIL_INTERNAL_H */