341 lines
11 KiB
C
Executable File
341 lines
11 KiB
C
Executable File
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common internal API header
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*/
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#ifndef AVUTIL_INTERNAL_H
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#define AVUTIL_INTERNAL_H
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#if !defined(DEBUG) && !defined(NDEBUG)
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# define NDEBUG
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#endif
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// This can be enabled to allow detection of additional integer overflows with ubsan
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//#define CHECKED
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#include <limits.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <assert.h>
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#include "config.h"
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#include "attributes.h"
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#include "timer.h"
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#include "cpu.h"
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#include "dict.h"
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#include "macros.h"
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#include "mem.h"
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#include "pixfmt.h"
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#include "version.h"
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#if ARCH_X86
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# include "x86/emms.h"
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#endif
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#ifndef emms_c
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# define emms_c() do {} while(0)
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#endif
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#ifndef attribute_align_arg
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#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
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# define attribute_align_arg __attribute__((force_align_arg_pointer))
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#else
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# define attribute_align_arg
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#endif
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#endif
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#if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avutil)
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# define av_export_avutil __declspec(dllimport)
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#else
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# define av_export_avutil
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#endif
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#if HAVE_PRAGMA_DEPRECATED
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# if defined(__ICL) || defined (__INTEL_COMPILER)
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# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
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# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
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# elif defined(_MSC_VER)
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# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
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# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
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# else
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# define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
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# define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic pop")
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# endif
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#else
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# define FF_DISABLE_DEPRECATION_WARNINGS
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# define FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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#define FF_MEMORY_POISON 0x2a
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#define MAKE_ACCESSORS(str, name, type, field) \
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type av_##name##_get_##field(const str *s) { return s->field; } \
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void av_##name##_set_##field(str *s, type v) { s->field = v; }
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// Some broken preprocessors need a second expansion
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// to be forced to tokenize __VA_ARGS__
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#define E1(x) x
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/* Check if the hard coded offset of a struct member still matches reality.
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* Induce a compilation failure if not.
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*/
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#define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
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int x_##o[offsetof(s, m) == o? 1: -1]; \
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}
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#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
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uint8_t la_##v[sizeof(t s o) + (a)]; \
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t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
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#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
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DECLARE_ALIGNED(a, t, la_##v) s o; \
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t (*v) o = la_##v
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#define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_D(4, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_4(t, v, ...) E1(LOCAL_ALIGNED_A(4, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
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#endif
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#define FF_ALLOC_TYPED_ARRAY(p, nelem) (p = av_malloc_array(nelem, sizeof(*p)))
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#define FF_ALLOCZ_TYPED_ARRAY(p, nelem) (p = av_mallocz_array(nelem, sizeof(*p)))
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#include "libm.h"
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/**
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* Return NULL if CONFIG_SMALL is true, otherwise the argument
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* without modification. Used to disable the definition of strings
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* (for example AVCodec long_names).
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*/
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#if CONFIG_SMALL
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# define NULL_IF_CONFIG_SMALL(x) NULL
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#else
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# define NULL_IF_CONFIG_SMALL(x) x
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#endif
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/**
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* Define a function with only the non-default version specified.
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*
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* On systems with ELF shared libraries, all symbols exported from
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* FFmpeg libraries are tagged with the name and major version of the
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* library to which they belong. If a function is moved from one
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* library to another, a wrapper must be retained in the original
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* location to preserve binary compatibility.
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*
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* Functions defined with this macro will never be used to resolve
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* symbols by the build-time linker.
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*
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* @param type return type of function
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* @param name name of function
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* @param args argument list of function
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* @param ver version tag to assign function
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*/
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#if HAVE_SYMVER_ASM_LABEL
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# define FF_SYMVER(type, name, args, ver) \
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type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
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type ff_##name args
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#elif HAVE_SYMVER_GNU_ASM
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# define FF_SYMVER(type, name, args, ver) \
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__asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
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type ff_##name args; \
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type ff_##name args
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#endif
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/**
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* Return NULL if a threading library has not been enabled.
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* Used to disable threading functions in AVCodec definitions
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* when not needed.
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*/
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#if HAVE_THREADS
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# define ONLY_IF_THREADS_ENABLED(x) x
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#else
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# define ONLY_IF_THREADS_ENABLED(x) NULL
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#endif
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/**
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* Log a generic warning message about a missing feature.
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*
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* @param[in] avc a pointer to an arbitrary struct of which the first
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* field is a pointer to an AVClass struct
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* @param[in] msg string containing the name of the missing feature
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*/
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void avpriv_report_missing_feature(void *avc,
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const char *msg, ...) av_printf_format(2, 3);
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/**
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* Log a generic warning message about a missing feature.
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* Additionally request that a sample showcasing the feature be uploaded.
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*
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* @param[in] avc a pointer to an arbitrary struct of which the first field is
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* a pointer to an AVClass struct
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* @param[in] msg string containing the name of the missing feature
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*/
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void avpriv_request_sample(void *avc,
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const char *msg, ...) av_printf_format(2, 3);
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#if HAVE_LIBC_MSVCRT
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#include <crtversion.h>
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#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
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#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
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#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
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#endif
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#define avpriv_open ff_open
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#define avpriv_tempfile ff_tempfile
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#define PTRDIFF_SPECIFIER "Id"
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#define SIZE_SPECIFIER "Iu"
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#else
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#define PTRDIFF_SPECIFIER "td"
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#define SIZE_SPECIFIER "zu"
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#endif
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#ifdef DEBUG
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# define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
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#else
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# define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
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#endif
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// For debuging we use signed operations so overflows can be detected (by ubsan)
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// For production we use unsigned so there are no undefined operations
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#ifdef CHECKED
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#define SUINT int
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#define SUINT32 int32_t
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#else
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#define SUINT unsigned
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#define SUINT32 uint32_t
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#endif
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/**
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* Clip and convert a double value into the long long amin-amax range.
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* This function is needed because conversion of floating point to integers when
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* it does not fit in the integer's representation does not necessarily saturate
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* correctly (usually converted to a cvttsd2si on x86) which saturates numbers
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* > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
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* behavior, allowing this sort of mathematically bogus conversions. This provides
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* a safe alternative that is slower obviously but assures safety and better
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* mathematical behavior.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
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{
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int64_t res;
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#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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if (amin > amax) abort();
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#endif
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// INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
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// do range checks first
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if (a >= 9223372036854775808.0)
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return amax;
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if (a <= -9223372036854775808.0)
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return amin;
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// safe to call llrint and clip accordingly
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res = llrint(a);
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if (res > amax)
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return amax;
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if (res < amin)
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return amin;
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return res;
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}
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/**
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* A wrapper for open() setting O_CLOEXEC.
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*/
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av_warn_unused_result
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int avpriv_open(const char *filename, int flags, ...);
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/**
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* Wrapper to work around the lack of mkstemp() on mingw.
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* Also, tries to create file in /tmp first, if possible.
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* *prefix can be a character constant; *filename will be allocated internally.
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* @return file descriptor of opened file (or negative value corresponding to an
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* AVERROR code on error)
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* and opened file name in **filename.
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* @note On very old libcs it is necessary to set a secure umask before
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* calling this, av_tempfile() can't call umask itself as it is used in
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* libraries and could interfere with the calling application.
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*/
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int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
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int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
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static av_always_inline av_const int avpriv_mirror(int x, int w)
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{
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if (!w)
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return 0;
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while ((unsigned)x > (unsigned)w) {
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x = -x;
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if (x < 0)
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x += 2 * w;
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}
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return x;
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}
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void ff_check_pixfmt_descriptors(void);
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/**
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* Set a dictionary value to an ISO-8601 compliant timestamp string.
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*
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* @param dict pointer to a pointer to a dictionary struct. If *dict is NULL
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* a dictionary struct is allocated and put in *dict.
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* @param key metadata key
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* @param timestamp unix timestamp in microseconds
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* @return <0 on error
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*/
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int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
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// Helper macro for AV_PIX_FMT_FLAG_PSEUDOPAL deprecation. Code inside FFmpeg
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// should always use FF_PSEUDOPAL. Once the public API flag gets removed, all
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// code using it is dead code.
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#if FF_API_PSEUDOPAL
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#define FF_PSEUDOPAL AV_PIX_FMT_FLAG_PSEUDOPAL
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#else
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#define FF_PSEUDOPAL 0
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#endif
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#endif /* AVUTIL_INTERNAL_H */
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