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() 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
67 #ifdef BUILDING_avutil
68 # define av_export_avutil __declspec(dllexport)
70 # define av_export_avutil __declspec(dllimport)
73 # define av_export_avutil
76 #if HAVE_PRAGMA_DEPRECATED
77 # if defined(__ICL) || defined (__INTEL_COMPILER)
78 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
79 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
80 # elif defined(_MSC_VER)
81 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
82 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
84 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
85 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
88 # define FF_DISABLE_DEPRECATION_WARNINGS
89 # define FF_ENABLE_DEPRECATION_WARNINGS
93 #define FF_MEMORY_POISON 0x2a
95 #define MAKE_ACCESSORS(str, name, type, field) \
96 type av_##name##_get_##field(const str *s) { return s->field; } \
97 void av_##name##_set_##field(str *s, type v) { s->field = v; }
99 // Some broken preprocessors need a second expansion
100 // to be forced to tokenize __VA_ARGS__
103 /* Check if the hard coded offset of a struct member still matches reality.
104 * Induce a compilation failure if not.
106 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
107 int x_##o[offsetof(s, m) == o? 1: -1]; \
110 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
111 uint8_t la_##v[sizeof(t s o) + (a)]; \
112 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
114 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
115 DECLARE_ALIGNED(a, t, la_##v) s o; \
118 #define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
120 #if HAVE_LOCAL_ALIGNED
121 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
123 # define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
126 #if HAVE_LOCAL_ALIGNED
127 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
129 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
132 #if HAVE_LOCAL_ALIGNED
133 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
135 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
138 #if HAVE_LOCAL_ALIGNED
139 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
141 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
144 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
146 p = av_malloc(size);\
147 if (!(p) && (size) != 0) {\
148 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
153 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
155 p = av_mallocz(size);\
156 if (!(p) && (size) != 0) {\
157 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
162 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
164 p = av_malloc_array(nelem, elsize);\
166 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
171 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
173 p = av_mallocz_array(nelem, elsize);\
175 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
183 * Return NULL if CONFIG_SMALL is true, otherwise the argument
184 * without modification. Used to disable the definition of strings
185 * (for example AVCodec long_names).
188 # define NULL_IF_CONFIG_SMALL(x) NULL
190 # define NULL_IF_CONFIG_SMALL(x) x
194 * Define a function with only the non-default version specified.
196 * On systems with ELF shared libraries, all symbols exported from
197 * FFmpeg libraries are tagged with the name and major version of the
198 * library to which they belong. If a function is moved from one
199 * library to another, a wrapper must be retained in the original
200 * location to preserve binary compatibility.
202 * Functions defined with this macro will never be used to resolve
203 * symbols by the build-time linker.
205 * @param type return type of function
206 * @param name name of function
207 * @param args argument list of function
208 * @param ver version tag to assign function
210 #if HAVE_SYMVER_ASM_LABEL
211 # define FF_SYMVER(type, name, args, ver) \
212 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
214 #elif HAVE_SYMVER_GNU_ASM
215 # define FF_SYMVER(type, name, args, ver) \
216 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
217 type ff_##name args; \
222 * Return NULL if a threading library has not been enabled.
223 * Used to disable threading functions in AVCodec definitions
227 # define ONLY_IF_THREADS_ENABLED(x) x
229 # define ONLY_IF_THREADS_ENABLED(x) NULL
233 * Log a generic warning message about a missing feature.
235 * @param[in] avc a pointer to an arbitrary struct of which the first
236 * field is a pointer to an AVClass struct
237 * @param[in] msg string containing the name of the missing feature
239 void avpriv_report_missing_feature(void *avc,
240 const char *msg, ...) av_printf_format(2, 3);
243 * Log a generic warning message about a missing feature.
244 * Additionally request that a sample showcasing the feature be uploaded.
246 * @param[in] avc a pointer to an arbitrary struct of which the first field is
247 * a pointer to an AVClass struct
248 * @param[in] msg string containing the name of the missing feature
250 void avpriv_request_sample(void *avc,
251 const char *msg, ...) av_printf_format(2, 3);
254 #include <crtversion.h>
255 #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
256 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
257 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
260 #define avpriv_open ff_open
261 #define avpriv_tempfile ff_tempfile
262 #define PTRDIFF_SPECIFIER "Id"
263 #define SIZE_SPECIFIER "Iu"
265 #define PTRDIFF_SPECIFIER "td"
266 #define SIZE_SPECIFIER "zu"
270 # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
272 # define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
275 // For debuging we use signed operations so overflows can be detected (by ubsan)
276 // For production we use unsigned so there are no undefined operations
279 #define SUINT32 int32_t
281 #define SUINT unsigned
282 #define SUINT32 uint32_t
286 * Clip and convert a double value into the long long amin-amax range.
287 * This function is needed because conversion of floating point to integers when
288 * it does not fit in the integer's representation does not necessarily saturate
289 * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
290 * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
291 * behavior, allowing this sort of mathematically bogus conversions. This provides
292 * a safe alternative that is slower obviously but assures safety and better
293 * mathematical behavior.
294 * @param a value to clip
295 * @param amin minimum value of the clip range
296 * @param amax maximum value of the clip range
297 * @return clipped value
299 static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
302 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
303 if (amin > amax) abort();
305 // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
306 // do range checks first
307 if (a >= 9223372036854775808.0)
309 if (a <= -9223372036854775808.0)
312 // safe to call llrint and clip accordingly
322 * A wrapper for open() setting O_CLOEXEC.
324 av_warn_unused_result
325 int avpriv_open(const char *filename, int flags, ...);
328 * Wrapper to work around the lack of mkstemp() on mingw.
329 * Also, tries to create file in /tmp first, if possible.
330 * *prefix can be a character constant; *filename will be allocated internally.
331 * @return file descriptor of opened file (or negative value corresponding to an
332 * AVERROR code on error)
333 * and opened file name in **filename.
334 * @note On very old libcs it is necessary to set a secure umask before
335 * calling this, av_tempfile() can't call umask itself as it is used in
336 * libraries and could interfere with the calling application.
338 int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
340 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
342 static av_always_inline av_const int avpriv_mirror(int x, int w)
347 while ((unsigned)x > (unsigned)w) {
355 void ff_check_pixfmt_descriptors(void);
358 * Set a dictionary value to an ISO-8601 compliant timestamp string.
360 * @param s AVFormatContext
361 * @param key metadata key
362 * @param timestamp unix timestamp in microseconds
363 * @return <0 on error
365 int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
367 #endif /* AVUTIL_INTERNAL_H */