mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
11388b5a8f
Fast, reasonably accurate 10^x. Alternative of detection of libm exp10 at configure time is not worth the trouble, since it is anyway not POSIX or ISO C, and currently only the GNU libm has it. Furthermore, GNU libm's variant is ~ 2x slower, and is ironically not correctly rounded (2 ulp off) to justify all that slowdown. Reviewed-by: James Almer <jamrial@gmail.com> Reviewed-by: Hendrik Leppkes <h.leppkes@gmail.com> Reviewed-by: Michael Niedermayer <michael@niedermayer.cc> Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
341 lines
10 KiB
C
341 lines
10 KiB
C
/*
|
|
* 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
|
|
|
|
#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 "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 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
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
/**
|
|
* Compute 10^x for floating point values. Note: this function is by no means
|
|
* "correctly rounded", and is meant as a fast, reasonably accurate approximation.
|
|
* For instance, maximum relative error for the double precision variant is
|
|
* ~ 1e-13 for very small and very large values.
|
|
* This is ~2x faster than GNU libm's approach, which is still off by 2ulp on
|
|
* some inputs.
|
|
* @param x exponent
|
|
* @return 10^x
|
|
*/
|
|
static av_always_inline double ff_exp10(double x)
|
|
{
|
|
return exp2(M_LOG2_10 * x);
|
|
}
|
|
|
|
static av_always_inline float ff_exp10f(float x)
|
|
{
|
|
return exp2f(M_LOG2_10 * x);
|
|
}
|
|
|
|
/**
|
|
* A wrapper for open() setting O_CLOEXEC.
|
|
*/
|
|
av_warn_unused_result
|
|
int avpriv_open(const char *filename, int flags, ...);
|
|
|
|
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);
|
|
|
|
extern const uint8_t ff_reverse[256];
|
|
|
|
#endif /* AVUTIL_INTERNAL_H */
|