/* * 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 */