1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of FFmpeg.
5 *
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.
10 *
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.
15 *
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
19 */
20
21 /**
22 * @file
23 * common internal API header
24 */
25
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
28
29 #if !defined(DEBUG) && !defined(NDEBUG)
31 #endif
32
33 // This can be enabled to allow detection of additional integer overflows with ubsan
34 //#define CHECKED
35
37 #include <stdint.h>
38 #include <stddef.h>
39 #include <assert.h>
48
49 #if ARCH_X86
51 #endif
52
53 #ifndef emms_c
54 # define emms_c() while(0)
55 #endif
56
57 #ifndef attribute_align_arg
58 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
59 # define attribute_align_arg __attribute__((force_align_arg_pointer))
60 #else
61 # define attribute_align_arg
62 #endif
63 #endif
64
65 #if defined(_MSC_VER) && CONFIG_SHARED
66 # define av_export __declspec(dllimport)
67 #else
69 #endif
70
71 #if HAVE_PRAGMA_DEPRECATED
72 # if defined(__ICL) || defined (__INTEL_COMPILER)
73 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
74 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
75 # elif defined(_MSC_VER)
76 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
77 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
78 # else
79 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
80 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
81 # endif
82 #else
83 # define FF_DISABLE_DEPRECATION_WARNINGS
84 # define FF_ENABLE_DEPRECATION_WARNINGS
85 #endif
86
87
88 #define FF_MEMORY_POISON 0x2a
89
90 #define MAKE_ACCESSORS(str, name, type, field) \
91 type av_##name##_get_##field(const str *s) { return s->field; } \
92 void av_##name##_set_##field(str *s, type v) { s->field = v; }
93
94 // Some broken preprocessors need a second expansion
95 // to be forced to tokenize __VA_ARGS__
97
98 /* Check if the hard coded offset of a struct member still matches reality.
99 * Induce a compilation failure if not.
100 */
101 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
102 int x_##o[offsetof(s, m) == o? 1: -1]; \
103 }
104
105 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
106 uint8_t la_##v[sizeof(t s o) + (a)]; \
107 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
108
109 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
110 DECLARE_ALIGNED(a, t, la_##v) s o; \
111 t (*v) o = la_##v
112
113 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
114
115 #if HAVE_LOCAL_ALIGNED_8
116 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
117 #else
118 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
119 #endif
120
121 #if HAVE_LOCAL_ALIGNED_16
122 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
123 #else
124 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
125 #endif
126
127 #if HAVE_LOCAL_ALIGNED_32
128 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
129 #else
130 # define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
131 #endif
132
133 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
134 {\
135 p = av_malloc(size);\
136 if (!(p) && (size) != 0) {\
137 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
138 goto label;\
139 }\
140 }
141
142 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
143 {\
144 p = av_mallocz(size);\
145 if (!(p) && (size) != 0) {\
146 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
147 goto label;\
148 }\
149 }
150
151 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
152 {\
153 p = av_malloc_array(nelem, elsize);\
154 if (!p) {\
155 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
156 goto label;\
157 }\
158 }
159
160 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
161 {\
162 p = av_mallocz_array(nelem, elsize);\
163 if (!p) {\
164 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
165 goto label;\
166 }\
167 }
168
170
171 /**
172 * Return NULL if CONFIG_SMALL is true, otherwise the argument
173 * without modification. Used to disable the definition of strings
174 * (for example AVCodec long_names).
175 */
176 #if CONFIG_SMALL
177 # define NULL_IF_CONFIG_SMALL(x) NULL
178 #else
179 # define NULL_IF_CONFIG_SMALL(x) x
180 #endif
181
182 /**
183 * Define a function with only the non-default version specified.
184 *
185 * On systems with ELF shared libraries, all symbols exported from
186 * FFmpeg libraries are tagged with the name and major version of the
187 * library to which they belong. If a function is moved from one
188 * library to another, a wrapper must be retained in the original
189 * location to preserve binary compatibility.
190 *
191 * Functions defined with this macro will never be used to resolve
192 * symbols by the build-time linker.
193 *
194 * @param type return type of function
195 * @param name name of function
196 * @param args argument list of function
197 * @param ver version tag to assign function
198 */
199 #if HAVE_SYMVER_ASM_LABEL
200 # define FF_SYMVER(type, name, args, ver) \
201 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
202 type ff_##name args
203 #elif HAVE_SYMVER_GNU_ASM
204 # define FF_SYMVER(type, name, args, ver) \
205 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
206 type ff_##name args; \
207 type ff_##name args
208 #endif
209
210 /**
211 * Return NULL if a threading library has not been enabled.
212 * Used to disable threading functions in AVCodec definitions
213 * when not needed.
214 */
215 #if HAVE_THREADS
216 # define ONLY_IF_THREADS_ENABLED(x) x
217 #else
218 # define ONLY_IF_THREADS_ENABLED(x) NULL
219 #endif
220
221 /**
222 * Log a generic warning message about a missing feature.
223 *
224 * @param[in] avc a pointer to an arbitrary struct of which the first
225 * field is a pointer to an AVClass struct
226 * @param[in] msg string containing the name of the missing feature
227 */
230
231 /**
232 * Log a generic warning message about a missing feature.
233 * Additionally request that a sample showcasing the feature be uploaded.
234 *
235 * @param[in] avc a pointer to an arbitrary struct of which the first field is
236 * a pointer to an AVClass struct
237 * @param[in] msg string containing the name of the missing feature
238 */
241
242 #if HAVE_LIBC_MSVCRT
243 #include <crtversion.h>
244 #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
245 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
246 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
247 #endif
248
249 #define avpriv_open ff_open
250 #define avpriv_tempfile ff_tempfile
251 #define PTRDIFF_SPECIFIER "Id"
252 #define SIZE_SPECIFIER "Iu"
253 #else
254 #define PTRDIFF_SPECIFIER "td"
255 #define SIZE_SPECIFIER "zu"
256 #endif
257
258 #ifdef DEBUG
259 # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
260 #else
261 # define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
262 #endif
263
264 // For debuging we use signed operations so overflows can be detected (by ubsan)
265 // For production we use unsigned so there are no undefined operations
266 #ifdef CHECKED
267 #define SUINT int
268 #define SUINT32 int32_t
269 #else
270 #define SUINT unsigned
271 #define SUINT32 uint32_t
272 #endif
273
274 /**
275 * Clip and convert a double value into the long long amin-amax range.
276 * This function is needed because conversion of floating point to integers when
277 * it does not fit in the integer's representation does not necessarily saturate
278 * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
279 * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
280 * behavior, allowing this sort of mathematically bogus conversions. This provides
281 * a safe alternative that is slower obviously but assures safety and better
282 * mathematical behavior.
283 * @param a value to clip
284 * @param amin minimum value of the clip range
285 * @param amax maximum value of the clip range
286 * @return clipped value
287 */
289 {
290 int64_t res;
291 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
292 if (amin > amax) abort();
293 #endif
294 // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
295 // do range checks first
296 if (a >= 9223372036854775808.0)
297 return amax;
298 if (a <= -9223372036854775808.0)
299 return amin;
300
301 // safe to call llrint and clip accordingly
303 if (res > amax)
304 return amax;
305 if (res < amin)
306 return amin;
307 return res;
308 }
309
310 /**
311 * A wrapper for open() setting O_CLOEXEC.
312 */
315
316 /**
317 * Wrapper to work around the lack of mkstemp() on mingw.
318 * Also, tries to create file in /tmp first, if possible.
319 * *prefix can be a character constant; *filename will be allocated internally.
320 * @return file descriptor of opened file (or negative value corresponding to an
321 * AVERROR code on error)
322 * and opened file name in **filename.
323 * @note On very old libcs it is necessary to set a secure umask before
324 * calling this, av_tempfile() can't call umask itself as it is used in
325 * libraries and could interfere with the calling application.
326 */
327 int avpriv_tempfile(
const char *prefix,
char **filename,
int log_offset,
void *log_ctx);
328
330
332 {
333 if (!w)
334 return 0;
335
336 while ((unsigned)x > (unsigned)w) {
337 x = -x;
338 if (x < 0)
339 x += 2 * w;
340 }
341 return x;
342 }
343
345
346 /**
347 * Set a dictionary value to an ISO-8601 compliant timestamp string.
348 *
349 * @param s AVFormatContext
350 * @param key metadata key
351 * @param timestamp unix timestamp in microseconds
352 * @return <0 on error
353 */
355
356 #endif /* AVUTIL_INTERNAL_H */
av_warn_unused_result int avpriv_open(const char *filename, int flags,...)
A wrapper for open() setting O_CLOEXEC.
static enum AVPixelFormat pix_fmt
static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
Clip and convert a double value into the long long amin-amax range.
Macro definitions for various function/variable attributes.
void void avpriv_request_sample(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
high precision timer, useful to profile code
Utility Preprocessor macros.
int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx)
Wrapper to work around the lack of mkstemp() on mingw.
Libavutil version macros.
#define av_printf_format(fmtpos, attrpos)
int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp)
Set a dictionary value to an ISO-8601 compliant timestamp string.
static av_always_inline av_const int avpriv_mirror(int x, int w)
Replacements for frequently missing libm functions.
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
#define av_warn_unused_result
void ff_check_pixfmt_descriptors(void)
int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt)
AVPixelFormat
Pixel format.