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)
38 #include "attributes.h"
47 # include "x86/emms.h"
51 # define emms_c() while(0)
54 #ifndef attribute_align_arg
55 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
56 # define attribute_align_arg __attribute__((force_align_arg_pointer))
58 # define attribute_align_arg
62 #if defined(_MSC_VER) && CONFIG_SHARED
63 # define av_export __declspec(dllimport)
68 #if HAVE_PRAGMA_DEPRECATED
69 # if defined(__ICL) || defined (__INTEL_COMPILER)
70 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
71 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
72 # elif defined(_MSC_VER)
73 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
74 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
76 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
77 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
80 # define FF_DISABLE_DEPRECATION_WARNINGS
81 # define FF_ENABLE_DEPRECATION_WARNINGS
85 #define FF_MEMORY_POISON 0x2a
87 #define MAKE_ACCESSORS(str, name, type, field) \
88 type av_##name##_get_##field(const str *s) { return s->field; } \
89 void av_##name##_set_##field(str *s, type v) { s->field = v; }
91 // Some broken preprocessors need a second expansion
92 // to be forced to tokenize __VA_ARGS__
95 /* Check if the hard coded offset of a struct member still matches reality.
96 * Induce a compilation failure if not.
98 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
99 int x_##o[offsetof(s, m) == o? 1: -1]; \
102 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
103 uint8_t la_##v[sizeof(t s o) + (a)]; \
104 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
106 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
107 DECLARE_ALIGNED(a, t, la_##v) s o; \
110 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
112 #if HAVE_LOCAL_ALIGNED_8
113 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
115 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
118 #if HAVE_LOCAL_ALIGNED_16
119 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
121 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
124 #if HAVE_LOCAL_ALIGNED_32
125 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
127 # define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
130 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
132 p = av_malloc(size);\
133 if (!(p) && (size) != 0) {\
134 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
139 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
141 p = av_mallocz(size);\
142 if (!(p) && (size) != 0) {\
143 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
148 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
150 p = av_malloc_array(nelem, elsize);\
152 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
157 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
159 p = av_mallocz_array(nelem, elsize);\
161 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
169 * Return NULL if CONFIG_SMALL is true, otherwise the argument
170 * without modification. Used to disable the definition of strings
171 * (for example AVCodec long_names).
174 # define NULL_IF_CONFIG_SMALL(x) NULL
176 # define NULL_IF_CONFIG_SMALL(x) x
180 * Define a function with only the non-default version specified.
182 * On systems with ELF shared libraries, all symbols exported from
183 * FFmpeg libraries are tagged with the name and major version of the
184 * library to which they belong. If a function is moved from one
185 * library to another, a wrapper must be retained in the original
186 * location to preserve binary compatibility.
188 * Functions defined with this macro will never be used to resolve
189 * symbols by the build-time linker.
191 * @param type return type of function
192 * @param name name of function
193 * @param args argument list of function
194 * @param ver version tag to assign function
196 #if HAVE_SYMVER_ASM_LABEL
197 # define FF_SYMVER(type, name, args, ver) \
198 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
200 #elif HAVE_SYMVER_GNU_ASM
201 # define FF_SYMVER(type, name, args, ver) \
202 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
203 type ff_##name args; \
208 * Return NULL if a threading library has not been enabled.
209 * Used to disable threading functions in AVCodec definitions
213 # define ONLY_IF_THREADS_ENABLED(x) x
215 # define ONLY_IF_THREADS_ENABLED(x) NULL
219 * Log a generic warning message about a missing feature.
221 * @param[in] avc a pointer to an arbitrary struct of which the first
222 * field is a pointer to an AVClass struct
223 * @param[in] msg string containing the name of the missing feature
225 void avpriv_report_missing_feature(void *avc,
226 const char *msg, ...) av_printf_format(2, 3);
229 * Log a generic warning message about a missing feature.
230 * Additionally request that a sample showcasing the feature be uploaded.
232 * @param[in] avc a pointer to an arbitrary struct of which the first field is
233 * a pointer to an AVClass struct
234 * @param[in] msg string containing the name of the missing feature
236 void avpriv_request_sample(void *avc,
237 const char *msg, ...) av_printf_format(2, 3);
240 #include <crtversion.h>
241 #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
242 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
243 #pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
246 #define avpriv_open ff_open
247 #define avpriv_tempfile ff_tempfile
248 #define PTRDIFF_SPECIFIER "Id"
249 #define SIZE_SPECIFIER "Iu"
251 #define PTRDIFF_SPECIFIER "td"
252 #define SIZE_SPECIFIER "zu"
256 # define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
258 # define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
262 * Clip and convert a double value into the long long amin-amax range.
263 * This function is needed because conversion of floating point to integers when
264 * it does not fit in the integer's representation does not necessarily saturate
265 * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
266 * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
267 * behavior, allowing this sort of mathematically bogus conversions. This provides
268 * a safe alternative that is slower obviously but assures safety and better
269 * mathematical behavior.
270 * @param a value to clip
271 * @param amin minimum value of the clip range
272 * @param amax maximum value of the clip range
273 * @return clipped value
275 static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
278 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
279 if (amin > amax) abort();
281 // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
282 // do range checks first
283 if (a >= 9223372036854775808.0)
285 if (a <= -9223372036854775808.0)
288 // safe to call llrint and clip accordingly
298 * A wrapper for open() setting O_CLOEXEC.
300 av_warn_unused_result
301 int avpriv_open(const char *filename, int flags, ...);
304 * Wrapper to work around the lack of mkstemp() on mingw.
305 * Also, tries to create file in /tmp first, if possible.
306 * *prefix can be a character constant; *filename will be allocated internally.
307 * @return file descriptor of opened file (or negative value corresponding to an
308 * AVERROR code on error)
309 * and opened file name in **filename.
310 * @note On very old libcs it is necessary to set a secure umask before
311 * calling this, av_tempfile() can't call umask itself as it is used in
312 * libraries and could interfere with the calling application.
314 int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
316 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
318 static av_always_inline av_const int avpriv_mirror(int x, int w)
323 while ((unsigned)x > (unsigned)w) {
331 void ff_check_pixfmt_descriptors(void);
334 * Set a dictionary value to an ISO-8601 compliant timestamp string.
336 * @param s AVFormatContext
337 * @param key metadata key
338 * @param timestamp unix timestamp in microseconds
339 * @return <0 on error
341 int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
343 extern const uint8_t ff_reverse[256];
345 #endif /* AVUTIL_INTERNAL_H */