libavutil/internal.h
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00001 /*
00002  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
00003  *
00004  * This file is part of Libav.
00005  *
00006  * Libav 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  * Libav 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 Libav; 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 #include "dict.h"
00041 
00042 struct AVDictionary {
00043     int count;
00044     AVDictionaryEntry *elems;
00045 };
00046 
00047 #ifndef attribute_align_arg
00048 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
00049 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
00050 #else
00051 #    define attribute_align_arg
00052 #endif
00053 #endif
00054 
00055 #ifndef INT16_MIN
00056 #define INT16_MIN       (-0x7fff - 1)
00057 #endif
00058 
00059 #ifndef INT16_MAX
00060 #define INT16_MAX       0x7fff
00061 #endif
00062 
00063 #ifndef INT32_MIN
00064 #define INT32_MIN       (-0x7fffffff - 1)
00065 #endif
00066 
00067 #ifndef INT32_MAX
00068 #define INT32_MAX       0x7fffffff
00069 #endif
00070 
00071 #ifndef UINT32_MAX
00072 #define UINT32_MAX      0xffffffff
00073 #endif
00074 
00075 #ifndef INT64_MIN
00076 #define INT64_MIN       (-0x7fffffffffffffffLL - 1)
00077 #endif
00078 
00079 #ifndef INT64_MAX
00080 #define INT64_MAX INT64_C(9223372036854775807)
00081 #endif
00082 
00083 #ifndef UINT64_MAX
00084 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
00085 #endif
00086 
00087 #ifndef INT_BIT
00088 #    define INT_BIT (CHAR_BIT * sizeof(int))
00089 #endif
00090 
00091 #ifndef offsetof
00092 #    define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
00093 #endif
00094 
00095 /* Use to export labels from asm. */
00096 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
00097 
00098 // Use rip-relative addressing if compiling PIC code on x86-64.
00099 #if ARCH_X86_64 && defined(PIC)
00100 #    define LOCAL_MANGLE(a) #a "(%%rip)"
00101 #else
00102 #    define LOCAL_MANGLE(a) #a
00103 #endif
00104 
00105 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
00106 
00107 /* debug stuff */
00108 
00109 #define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
00110 
00111 /* math */
00112 
00113 #if ARCH_X86
00114 #define MASK_ABS(mask, level)\
00115             __asm__ volatile(\
00116                 "cltd                   \n\t"\
00117                 "xorl %1, %0            \n\t"\
00118                 "subl %1, %0            \n\t"\
00119                 : "+a" (level), "=&d" (mask)\
00120             );
00121 #else
00122 #define MASK_ABS(mask, level)\
00123             mask  = level >> 31;\
00124             level = (level ^ mask) - mask;
00125 #endif
00126 
00127 /* avoid usage of dangerous/inappropriate system functions */
00128 #undef  malloc
00129 #define malloc please_use_av_malloc
00130 #undef  free
00131 #define free please_use_av_free
00132 #undef  realloc
00133 #define realloc please_use_av_realloc
00134 #undef  time
00135 #define time time_is_forbidden_due_to_security_issues
00136 #undef  rand
00137 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
00138 #undef  srand
00139 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
00140 #undef  random
00141 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
00142 #undef  sprintf
00143 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
00144 #undef  strcat
00145 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
00146 #undef  strncpy
00147 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
00148 #undef  exit
00149 #define exit exit_is_forbidden
00150 #undef  printf
00151 #define printf please_use_av_log_instead_of_printf
00152 #undef  fprintf
00153 #define fprintf please_use_av_log_instead_of_fprintf
00154 #undef  puts
00155 #define puts please_use_av_log_instead_of_puts
00156 #undef  perror
00157 #define perror please_use_av_log_instead_of_perror
00158 #undef strcasecmp
00159 #define strcasecmp please_use_av_strcasecmp
00160 #undef strncasecmp
00161 #define strncasecmp please_use_av_strncasecmp
00162 
00163 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
00164 {\
00165     p = av_malloc(size);\
00166     if (p == NULL && (size) != 0) {\
00167         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
00168         goto label;\
00169     }\
00170 }
00171 
00172 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
00173 {\
00174     p = av_mallocz(size);\
00175     if (p == NULL && (size) != 0) {\
00176         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
00177         goto label;\
00178     }\
00179 }
00180 
00181 #include "libm.h"
00182 
00188 #if CONFIG_SMALL
00189 #   define NULL_IF_CONFIG_SMALL(x) NULL
00190 #else
00191 #   define NULL_IF_CONFIG_SMALL(x) x
00192 #endif
00193 
00194 
00212 #if HAVE_SYMVER_ASM_LABEL
00213 #   define FF_SYMVER(type, name, args, ver)                     \
00214     type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
00215     type ff_##name args
00216 #elif HAVE_SYMVER_GNU_ASM
00217 #   define FF_SYMVER(type, name, args, ver)                             \
00218     __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
00219     type ff_##name args;                                                \
00220     type ff_##name args
00221 #endif
00222 
00228 #if HAVE_THREADS
00229 #   define ONLY_IF_THREADS_ENABLED(x) x
00230 #else
00231 #   define ONLY_IF_THREADS_ENABLED(x) NULL
00232 #endif
00233 
00234 #if HAVE_MMX
00235 
00240 static av_always_inline void emms_c(void)
00241 {
00242     __asm__ volatile ("emms" ::: "memory");
00243 }
00244 #else /* HAVE_MMX */
00245 #define emms_c()
00246 #endif /* HAVE_MMX */
00247 
00248 #endif /* AVUTIL_INTERNAL_H */