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
23 * common internal API header
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
29 #if !defined(DEBUG) && !defined(NDEBUG)
33 // This can be enabled to allow detection of additional integer overflows with ubsan
41 #include "attributes.h"
51 # include "x86/emms.h"
55 # define emms_c() do {} while(0)
58 #ifndef attribute_align_arg
59 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
60 # define attribute_align_arg __attribute__((force_align_arg_pointer))
62 # define attribute_align_arg
66 #if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avutil)
67 # define av_export_avutil __declspec(dllimport)
69 # define av_export_avutil
72 #if HAVE_PRAGMA_DEPRECATED
73 # if defined(__ICL) || defined (__INTEL_COMPILER)
74 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
75 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
76 # elif defined(_MSC_VER)
77 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
78 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
80 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
81 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic pop")
84 # define FF_DISABLE_DEPRECATION_WARNINGS
85 # define FF_ENABLE_DEPRECATION_WARNINGS
89 #define FF_MEMORY_POISON 0x2a
91 #define MAKE_ACCESSORS(str, name, type, field) \
92 type av_##name##_get_##field(const str *s) { return s->field; } \
93 void av_##name##_set_##field(str *s, type v) { s->field = v; }
95 // Some broken preprocessors need a second expansion
96 // to be forced to tokenize __VA_ARGS__
99 /* Check if the hard coded offset of a struct member still matches reality.
100 * Induce a compilation failure if not.
102 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
103 int x_##o[offsetof(s, m) == o? 1: -1]; \
106 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
107 uint8_t la_##v[sizeof(t s o) + (a)]; \
108 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
110 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
111 DECLARE_ALIGNED(a, t, la_##v) s o; \
114 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
116 #if HAVE_LOCAL_ALIGNED
117 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
119 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
122 #if HAVE_LOCAL_ALIGNED
123 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
125 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
128 #if HAVE_LOCAL_ALIGNED
129 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
131 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
134 #if HAVE_LOCAL_ALIGNED
135 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
137 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
140 #define FF_ALLOC_TYPED_ARRAY(p, nelem) (p = av_malloc_array(nelem, sizeof(*p)))
141 #define FF_ALLOCZ_TYPED_ARRAY(p, nelem) (p = av_mallocz_array(nelem, sizeof(*p)))
143 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
145 p = av_malloc(size);\
146 if (!(p) && (size) != 0) {\
147 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
152 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
154 p = av_mallocz(size);\
155 if (!(p) && (size) != 0) {\
156 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
161 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
163 p = av_malloc_array(nelem, elsize);\
165 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
170 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
172 p = av_mallocz_array(nelem, elsize);\
174 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
182 * Return NULL if CONFIG_SMALL is true, otherwise the argument
183 * without modification. Used to disable the definition of strings
184 * (for example AVCodec long_names).
187 # define NULL_IF_CONFIG_SMALL(x) NULL
189 # define NULL_IF_CONFIG_SMALL(x) x
193 * Define a function with only the non-default version specified.
195 * On systems with ELF shared libraries, all symbols exported from
196 * FFmpeg libraries are tagged with the name and major version of the
197 * library to which they belong. If a function is moved from one
198 * library to another, a wrapper must be retained in the original
199 * location to preserve binary compatibility.
201 * Functions defined with this macro will never be used to resolve
202 * symbols by the build-time linker.
204 * @param type return type of function
205 * @param name name of function
206 * @param args argument list of function
207 * @param ver version tag to assign function
209 #if HAVE_SYMVER_ASM_LABEL
210 # define FF_SYMVER(type, name, args, ver) \
211 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
213 #elif HAVE_SYMVER_GNU_ASM
214 # define FF_SYMVER(type, name, args, ver) \
215 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
216 type ff_##name args; \
221 * Return NULL if a threading library has not been enabled.
222 * Used to disable threading functions in AVCodec definitions
226 # define ONLY_IF_THREADS_ENABLED(x) x
228 # define ONLY_IF_THREADS_ENABLED(x) NULL
232 * Log a generic warning message about a missing feature.
234 * @param[in] avc a pointer to an arbitrary struct of which the first
235 * field is a pointer to an AVClass struct
236 * @param[in] msg string containing the name of the missing feature
238 void avpriv_report_missing_feature(void *avc,
239 const char *msg, ...) av_printf_format(2, 3);
242 * Log a generic warning message about a missing feature.
243 * Additionally request that a sample showcasing the feature be uploaded.
245 * @param[in] avc a pointer to an arbitrary struct of which the first field is
246 * a pointer to an AVClass struct
247 * @param[in] msg string containing the name of the missing feature
249 void avpriv_request_sample(void *avc,
250 const char *msg, ...) av_printf_format(2, 3);
253 #include <crtversion.h>
254 #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
255 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
256 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
259 #define avpriv_open ff_open
260 #define avpriv_tempfile ff_tempfile
261 #define PTRDIFF_SPECIFIER "Id"
262 #define SIZE_SPECIFIER "Iu"
264 #define PTRDIFF_SPECIFIER "td"
265 #define SIZE_SPECIFIER "zu"
269 # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
271 # define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
274 // For debuging we use signed operations so overflows can be detected (by ubsan)
275 // For production we use unsigned so there are no undefined operations
278 #define SUINT32 int32_t
280 #define SUINT unsigned
281 #define SUINT32 uint32_t
285 * Clip and convert a double value into the long long amin-amax range.
286 * This function is needed because conversion of floating point to integers when
287 * it does not fit in the integer's representation does not necessarily saturate
288 * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
289 * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
290 * behavior, allowing this sort of mathematically bogus conversions. This provides
291 * a safe alternative that is slower obviously but assures safety and better
292 * mathematical behavior.
293 * @param a value to clip
294 * @param amin minimum value of the clip range
295 * @param amax maximum value of the clip range
296 * @return clipped value
298 static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
301 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
302 if (amin > amax) abort();
304 // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
305 // do range checks first
306 if (a >= 9223372036854775808.0)
308 if (a <= -9223372036854775808.0)
311 // safe to call llrint and clip accordingly
321 * A wrapper for open() setting O_CLOEXEC.
323 av_warn_unused_result
324 int avpriv_open(const char *filename, int flags, ...);
327 * Wrapper to work around the lack of mkstemp() on mingw.
328 * Also, tries to create file in /tmp first, if possible.
329 * *prefix can be a character constant; *filename will be allocated internally.
330 * @return file descriptor of opened file (or negative value corresponding to an
331 * AVERROR code on error)
332 * and opened file name in **filename.
333 * @note On very old libcs it is necessary to set a secure umask before
334 * calling this, av_tempfile() can't call umask itself as it is used in
335 * libraries and could interfere with the calling application.
337 int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
339 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
341 static av_always_inline av_const int avpriv_mirror(int x, int w)
346 while ((unsigned)x > (unsigned)w) {
354 void ff_check_pixfmt_descriptors(void);
357 * Set a dictionary value to an ISO-8601 compliant timestamp string.
359 * @param s AVFormatContext
360 * @param key metadata key
361 * @param timestamp unix timestamp in microseconds
362 * @return <0 on error
364 int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
366 // Helper macro for AV_PIX_FMT_FLAG_PSEUDOPAL deprecation. Code inside FFmpeg
367 // should always use FF_PSEUDOPAL. Once the public API flag gets removed, all
368 // code using it is dead code.
370 #define FF_PSEUDOPAL AV_PIX_FMT_FLAG_PSEUDOPAL
372 #define FF_PSEUDOPAL 0
375 #endif /* AVUTIL_INTERNAL_H */