summaryrefslogtreecommitdiffstats
path: root/libavutil/internal.h
blob: a2d73e3cc6c6354cf158e73db03016a0647b60f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/*
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * common internal API header
 */

#ifndef AVUTIL_INTERNAL_H
#define AVUTIL_INTERNAL_H

#if !defined(DEBUG) && !defined(NDEBUG)
#    define NDEBUG
#endif

// This can be enabled to allow detection of additional integer overflows with ubsan
//#define CHECKED

#include <limits.h>
#include <stdint.h>
#include <stddef.h>
#include <assert.h>
#include "config.h"
#include "attributes.h"
#include "timer.h"
#include "cpu.h"
#include "dict.h"
#include "macros.h"
#include "pixfmt.h"
#include "version.h"

#if ARCH_X86
#   include "x86/emms.h"
#endif

#ifndef emms_c
#   define emms_c() while(0)
#endif

#ifndef attribute_align_arg
#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
#    define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
#    define attribute_align_arg
#endif
#endif

#if defined(_MSC_VER) && CONFIG_SHARED
#    define av_export __declspec(dllimport)
#else
#    define av_export
#endif

#if HAVE_PRAGMA_DEPRECATED
#    if defined(__ICL) || defined (__INTEL_COMPILER)
#        define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
#        define FF_ENABLE_DEPRECATION_WARNINGS  __pragma(warning(pop))
#    elif defined(_MSC_VER)
#        define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
#        define FF_ENABLE_DEPRECATION_WARNINGS  __pragma(warning(pop))
#    else
#        define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
#        define FF_ENABLE_DEPRECATION_WARNINGS  _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
#    endif
#else
#    define FF_DISABLE_DEPRECATION_WARNINGS
#    define FF_ENABLE_DEPRECATION_WARNINGS
#endif


#define FF_MEMORY_POISON 0x2a

#define MAKE_ACCESSORS(str, name, type, field) \
    type av_##name##_get_##field(const str *s) { return s->field; } \
    void av_##name##_set_##field(str *s, type v) { s->field = v; }

// Some broken preprocessors need a second expansion
// to be forced to tokenize __VA_ARGS__
#define E1(x) x

/* Check if the hard coded offset of a struct member still matches reality.
 * Induce a compilation failure if not.
 */
#define AV_CHECK_OFFSET(s, m, o) struct check_##o {    \
        int x_##o[offsetof(s, m) == o? 1: -1];         \
    }

#define LOCAL_ALIGNED_A(a, t, v, s, o, ...)             \
    uint8_t la_##v[sizeof(t s o) + (a)];                \
    t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)

#define LOCAL_ALIGNED_D(a, t, v, s, o, ...)             \
    DECLARE_ALIGNED(a, t, la_##v) s o;                  \
    t (*v) o = la_##v

#define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))

#if HAVE_LOCAL_ALIGNED_8
#   define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
#else
#   define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
#endif

#if HAVE_LOCAL_ALIGNED_16
#   define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
#else
#   define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
#endif

#if HAVE_LOCAL_ALIGNED_32
#   define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
#else
#   define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
#endif

#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
{\
    p = av_malloc(size);\
    if (!(p) && (size) != 0) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
{\
    p = av_mallocz(size);\
    if (!(p) && (size) != 0) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
{\
    p = av_malloc_array(nelem, elsize);\
    if (!p) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
{\
    p = av_mallocz_array(nelem, elsize);\
    if (!p) {\
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
        goto label;\
    }\
}

#include "libm.h"

/**
 * Return NULL if CONFIG_SMALL is true, otherwise the argument
 * without modification. Used to disable the definition of strings
 * (for example AVCodec long_names).
 */
#if CONFIG_SMALL
#   define NULL_IF_CONFIG_SMALL(x) NULL
#else
#   define NULL_IF_CONFIG_SMALL(x) x
#endif

/**
 * Define a function with only the non-default version specified.
 *
 * On systems with ELF shared libraries, all symbols exported from
 * FFmpeg libraries are tagged with the name and major version of the
 * library to which they belong.  If a function is moved from one
 * library to another, a wrapper must be retained in the original
 * location to preserve binary compatibility.
 *
 * Functions defined with this macro will never be used to resolve
 * symbols by the build-time linker.
 *
 * @param type return type of function
 * @param name name of function
 * @param args argument list of function
 * @param ver  version tag to assign function
 */
#if HAVE_SYMVER_ASM_LABEL
#   define FF_SYMVER(type, name, args, ver)                     \
    type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
    type ff_##name args
#elif HAVE_SYMVER_GNU_ASM
#   define FF_SYMVER(type, name, args, ver)                             \
    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
    type ff_##name args;                                                \
    type ff_##name args
#endif

/**
 * Return NULL if a threading library has not been enabled.
 * Used to disable threading functions in AVCodec definitions
 * when not needed.
 */
#if HAVE_THREADS
#   define ONLY_IF_THREADS_ENABLED(x) x
#else
#   define ONLY_IF_THREADS_ENABLED(x) NULL
#endif

/**
 * Log a generic warning message about a missing feature.
 *
 * @param[in] avc a pointer to an arbitrary struct of which the first
 *                field is a pointer to an AVClass struct
 * @param[in] msg string containing the name of the missing feature
 */
void avpriv_report_missing_feature(void *avc,
                                   const char *msg, ...) av_printf_format(2, 3);

/**
 * Log a generic warning message about a missing feature.
 * Additionally request that a sample showcasing the feature be uploaded.
 *
 * @param[in] avc a pointer to an arbitrary struct of which the first field is
 *                a pointer to an AVClass struct
 * @param[in] msg string containing the name of the missing feature
 */
void avpriv_request_sample(void *avc,
                           const char *msg, ...) av_printf_format(2, 3);

#if HAVE_LIBC_MSVCRT
#include <crtversion.h>
#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
#endif

#define avpriv_open ff_open
#define avpriv_tempfile ff_tempfile
#define PTRDIFF_SPECIFIER "Id"
#define SIZE_SPECIFIER "Iu"
#else
#define PTRDIFF_SPECIFIER "td"
#define SIZE_SPECIFIER "zu"
#endif

#ifdef DEBUG
#   define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
#else
#   define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
#endif

// For debuging we use signed operations so overflows can be detected (by ubsan)
// For production we use unsigned so there are no undefined operations
#ifdef CHECKED
#define SUINT   int
#define SUINT32 int32_t
#else
#define SUINT   unsigned
#define SUINT32 uint32_t
#endif

/**
 * Clip and convert a double value into the long long amin-amax range.
 * This function is needed because conversion of floating point to integers when
 * it does not fit in the integer's representation does not necessarily saturate
 * correctly (usually converted to a cvttsd2si on x86) which saturates numbers
 * > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
 * behavior, allowing this sort of mathematically bogus conversions. This provides
 * a safe alternative that is slower obviously but assures safety and better
 * mathematical behavior.
 * @param a value to clip
 * @param amin minimum value of the clip range
 * @param amax maximum value of the clip range
 * @return clipped value
 */
static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
{
    int64_t res;
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
    if (amin > amax) abort();
#endif
    // INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
    // do range checks first
    if (a >=  9223372036854775808.0)
        return amax;
    if (a <= -9223372036854775808.0)
        return amin;

    // safe to call llrint and clip accordingly
    res = llrint(a);
    if (res > amax)
        return amax;
    if (res < amin)
        return amin;
    return res;
}

/**
 * A wrapper for open() setting O_CLOEXEC.
 */
av_warn_unused_result
int avpriv_open(const char *filename, int flags, ...);

/**
 * Wrapper to work around the lack of mkstemp() on mingw.
 * Also, tries to create file in /tmp first, if possible.
 * *prefix can be a character constant; *filename will be allocated internally.
 * @return file descriptor of opened file (or negative value corresponding to an
 * AVERROR code on error)
 * and opened file name in **filename.
 * @note On very old libcs it is necessary to set a secure umask before
 *       calling this, av_tempfile() can't call umask itself as it is used in
 *       libraries and could interfere with the calling application.
 */
int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);

int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);

static av_always_inline av_const int avpriv_mirror(int x, int w)
{
    if (!w)
        return 0;

    while ((unsigned)x > (unsigned)w) {
        x = -x;
        if (x < 0)
            x += 2 * w;
    }
    return x;
}

void ff_check_pixfmt_descriptors(void);

/**
 * Set a dictionary value to an ISO-8601 compliant timestamp string.
 *
 * @param s AVFormatContext
 * @param key metadata key
 * @param timestamp unix timestamp in microseconds
 * @return <0 on error
 */
int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);

#endif /* AVUTIL_INTERNAL_H */
OpenPOWER on IntegriCloud