2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 * @file libavutil/internal.h
23 * common internal API header
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
29 #if !defined(DEBUG) && !defined(NDEBUG)
42 #ifndef attribute_align_arg
43 #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2)
44 # define attribute_align_arg __attribute__((force_align_arg_pointer))
46 # define attribute_align_arg
50 #ifndef attribute_used
51 #if AV_GCC_VERSION_AT_LEAST(3,1)
52 # define attribute_used __attribute__((used))
54 # define attribute_used
59 #define INT16_MIN (-0x7fff - 1)
63 #define INT16_MAX 0x7fff
67 #define INT32_MIN (-0x7fffffff - 1)
71 #define INT32_MAX 0x7fffffff
75 #define UINT32_MAX 0xffffffff
79 #define INT64_MIN (-0x7fffffffffffffffLL - 1)
83 #define INT64_MAX INT64_C(9223372036854775807)
87 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
91 # define INT_BIT (CHAR_BIT * sizeof(int))
94 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
99 # define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
102 /* Use to export labels from asm. */
103 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
105 // Use rip-relative addressing if compiling PIC code on x86-64.
106 #if ARCH_X86_64 && defined(PIC)
107 # define LOCAL_MANGLE(a) #a "(%%rip)"
109 # define LOCAL_MANGLE(a) #a
112 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
118 # define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
120 # define dprintf(pctx, ...)
123 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
127 extern const uint32_t ff_inverse[257];
130 # define FASTDIV(a,b) \
135 :"=d"(ret), "=a"(dmy)\
136 :"1"(a), "g"(ff_inverse[b])\
140 #elif HAVE_ARMV6 && HAVE_INLINE_ASM
141 static inline av_const int FASTDIV(int a, int b)
144 __asm__ volatile("cmp %3, #2 \n\t"
145 "ldr %1, [%4, %3, lsl #2] \n\t"
146 "lsrle %0, %2, #1 \n\t"
147 "smmulgt %0, %1, %2 \n\t"
148 : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
151 #elif ARCH_ARM && HAVE_INLINE_ASM
152 static inline av_const int FASTDIV(int a, int b)
155 __asm__ volatile("umull %1, %0, %2, %3"
156 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
160 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
162 # define FASTDIV(a,b) ((a) / (b))
165 extern const uint8_t ff_sqrt_tab[256];
167 static inline av_const unsigned int ff_sqrt(unsigned int a)
171 if (a < 255) return (ff_sqrt_tab[a + 1] - 1) >> 4;
172 else if (a < (1 << 12)) b = ff_sqrt_tab[a >> 4] >> 2;
174 else if (a < (1 << 14)) b = ff_sqrt_tab[a >> 6] >> 1;
175 else if (a < (1 << 16)) b = ff_sqrt_tab[a >> 8] ;
178 int s = av_log2_16bit(a >> 16) >> 1;
179 unsigned int c = a >> (s + 2);
180 b = ff_sqrt_tab[c >> (s + 8)];
181 b = FASTDIV(c,b) + (b << s);
184 return b - (a < b * b);
188 #define MASK_ABS(mask, level)\
193 : "+a" (level), "=&d" (mask)\
196 #define MASK_ABS(mask, level)\
198 level = (level ^ mask) - mask;
202 #define COPY3_IF_LT(x, y, a, b, c, d)\
208 : "+&r" (x), "+&r" (a), "+r" (c)\
209 : "r" (y), "r" (b), "r" (d)\
212 #define COPY3_IF_LT(x, y, a, b, c, d)\
220 /* avoid usage of dangerous/inappropriate system functions */
222 #define malloc please_use_av_malloc
224 #define free please_use_av_free
226 #define realloc please_use_av_realloc
228 #define time time_is_forbidden_due_to_security_issues
230 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
232 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
234 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
236 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
238 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
240 #define exit exit_is_forbidden
241 #ifndef LIBAVFORMAT_BUILD
243 #define printf please_use_av_log_instead_of_printf
245 #define fprintf please_use_av_log_instead_of_fprintf
247 #define puts please_use_av_log_instead_of_puts
249 #define perror please_use_av_log_instead_of_perror
252 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
254 p = av_malloc(size);\
255 if (p == NULL && (size) != 0) {\
256 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
261 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
263 p = av_mallocz(size);\
264 if (p == NULL && (size) != 0) {\
265 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
271 static av_always_inline av_const long long llrint(double x)
275 #endif /* HAVE_LLRINT */
278 static av_always_inline av_const double log2(double x)
280 return log(x) * 1.44269504088896340736;
282 #endif /* HAVE_LOG2 */
285 static av_always_inline av_const long int lrint(double x)
289 #endif /* HAVE_LRINT */
292 static av_always_inline av_const long int lrintf(float x)
294 return (int)(rint(x));
296 #endif /* HAVE_LRINTF */
299 static av_always_inline av_const double round(double x)
301 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
303 #endif /* HAVE_ROUND */
306 static av_always_inline av_const float roundf(float x)
308 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
310 #endif /* HAVE_ROUNDF */
313 static av_always_inline av_const float truncf(float x)
315 return (x > 0) ? floor(x) : ceil(x);
317 #endif /* HAVE_TRUNCF */
320 * Returns NULL if CONFIG_SMALL is true, otherwise the argument
321 * without modification. Used to disable the definition of strings
322 * (for example AVCodec long_names).
325 # define NULL_IF_CONFIG_SMALL(x) NULL
327 # define NULL_IF_CONFIG_SMALL(x) x
330 #endif /* AVUTIL_INTERNAL_H */