mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
21f9468402
Libav, for some reason, merged this as a public API function. This will aid in future merges. A define is left for backwards compat, just in case some person used it, since it is in a public header. Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
531 lines
15 KiB
C
531 lines
15 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 and external API header
|
|
*/
|
|
|
|
#ifndef AVUTIL_COMMON_H
|
|
#define AVUTIL_COMMON_H
|
|
|
|
#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
|
|
#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
|
|
#endif
|
|
|
|
#include <errno.h>
|
|
#include <inttypes.h>
|
|
#include <limits.h>
|
|
#include <math.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "attributes.h"
|
|
#include "macros.h"
|
|
#include "version.h"
|
|
#include "libavutil/avconfig.h"
|
|
|
|
#if AV_HAVE_BIGENDIAN
|
|
# define AV_NE(be, le) (be)
|
|
#else
|
|
# define AV_NE(be, le) (le)
|
|
#endif
|
|
|
|
//rounded division & shift
|
|
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
|
|
/* assume b>0 */
|
|
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
|
|
/* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
|
|
#define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
|
|
: ((a) + (1<<(b)) - 1) >> (b))
|
|
/* Backwards compat. */
|
|
#define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
|
|
|
|
#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
|
|
#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
|
|
|
|
/**
|
|
* Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
|
|
* are not representable as absolute values of their type. This is the same
|
|
* as with *abs()
|
|
* @see FFNABS()
|
|
*/
|
|
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
|
|
#define FFSIGN(a) ((a) > 0 ? 1 : -1)
|
|
|
|
/**
|
|
* Negative Absolute value.
|
|
* this works for all integers of all types.
|
|
* As with many macros, this evaluates its argument twice, it thus must not have
|
|
* a sideeffect, that is FFNABS(x++) has undefined behavior.
|
|
*/
|
|
#define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
|
|
|
|
/**
|
|
* Comparator.
|
|
* For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0
|
|
* if x == y. This is useful for instance in a qsort comparator callback.
|
|
* Furthermore, compilers are able to optimize this to branchless code, and
|
|
* there is no risk of overflow with signed types.
|
|
* As with many macros, this evaluates its argument multiple times, it thus
|
|
* must not have a side-effect.
|
|
*/
|
|
#define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))
|
|
|
|
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
|
|
#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
|
|
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
|
|
#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
|
|
|
|
#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
|
|
#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
|
|
|
|
/* misc math functions */
|
|
|
|
#ifdef HAVE_AV_CONFIG_H
|
|
# include "config.h"
|
|
# include "intmath.h"
|
|
#endif
|
|
|
|
/* Pull in unguarded fallback defines at the end of this file. */
|
|
#include "common.h"
|
|
|
|
#ifndef av_log2
|
|
av_const int av_log2(unsigned v);
|
|
#endif
|
|
|
|
#ifndef av_log2_16bit
|
|
av_const int av_log2_16bit(unsigned v);
|
|
#endif
|
|
|
|
/**
|
|
* Clip a signed integer value into the amin-amax range.
|
|
* @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 int av_clip_c(int a, int amin, int amax)
|
|
{
|
|
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
|
|
if (amin > amax) abort();
|
|
#endif
|
|
if (a < amin) return amin;
|
|
else if (a > amax) return amax;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed 64bit integer value into the amin-amax range.
|
|
* @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 av_clip64_c(int64_t a, int64_t amin, int64_t amax)
|
|
{
|
|
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
|
|
if (amin > amax) abort();
|
|
#endif
|
|
if (a < amin) return amin;
|
|
else if (a > amax) return amax;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer value into the 0-255 range.
|
|
* @param a value to clip
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
|
|
{
|
|
if (a&(~0xFF)) return (-a)>>31;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer value into the -128,127 range.
|
|
* @param a value to clip
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const int8_t av_clip_int8_c(int a)
|
|
{
|
|
if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer value into the 0-65535 range.
|
|
* @param a value to clip
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
|
|
{
|
|
if (a&(~0xFFFF)) return (-a)>>31;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer value into the -32768,32767 range.
|
|
* @param a value to clip
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const int16_t av_clip_int16_c(int a)
|
|
{
|
|
if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
|
|
* @param a value to clip
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
|
|
{
|
|
if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
|
|
else return (int32_t)a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer into the -(2^p),(2^p-1) range.
|
|
* @param a value to clip
|
|
* @param p bit position to clip at
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const int av_clip_intp2_c(int a, int p)
|
|
{
|
|
if (((unsigned)a + (1 << p)) & ~((2 << p) - 1))
|
|
return (a >> 31) ^ ((1 << p) - 1);
|
|
else
|
|
return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a signed integer to an unsigned power of two range.
|
|
* @param a value to clip
|
|
* @param p bit position to clip at
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
|
|
{
|
|
if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clear high bits from an unsigned integer starting with specific bit position
|
|
* @param a value to clip
|
|
* @param p bit position to clip at
|
|
* @return clipped value
|
|
*/
|
|
static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
|
|
{
|
|
return a & ((1 << p) - 1);
|
|
}
|
|
|
|
/**
|
|
* Add two signed 32-bit values with saturation.
|
|
*
|
|
* @param a one value
|
|
* @param b another value
|
|
* @return sum with signed saturation
|
|
*/
|
|
static av_always_inline int av_sat_add32_c(int a, int b)
|
|
{
|
|
return av_clipl_int32((int64_t)a + b);
|
|
}
|
|
|
|
/**
|
|
* Add a doubled value to another value with saturation at both stages.
|
|
*
|
|
* @param a first value
|
|
* @param b value doubled and added to a
|
|
* @return sum with signed saturation
|
|
*/
|
|
static av_always_inline int av_sat_dadd32_c(int a, int b)
|
|
{
|
|
return av_sat_add32(a, av_sat_add32(b, b));
|
|
}
|
|
|
|
/**
|
|
* Clip a float value into the amin-amax range.
|
|
* @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 float av_clipf_c(float a, float amin, float amax)
|
|
{
|
|
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
|
|
if (amin > amax) abort();
|
|
#endif
|
|
if (a < amin) return amin;
|
|
else if (a > amax) return amax;
|
|
else return a;
|
|
}
|
|
|
|
/**
|
|
* Clip a double value into the amin-amax range.
|
|
* @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 double av_clipd_c(double a, double amin, double amax)
|
|
{
|
|
#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
|
|
if (amin > amax) abort();
|
|
#endif
|
|
if (a < amin) return amin;
|
|
else if (a > amax) return amax;
|
|
else return a;
|
|
}
|
|
|
|
/** Compute ceil(log2(x)).
|
|
* @param x value used to compute ceil(log2(x))
|
|
* @return computed ceiling of log2(x)
|
|
*/
|
|
static av_always_inline av_const int av_ceil_log2_c(int x)
|
|
{
|
|
return av_log2((x - 1) << 1);
|
|
}
|
|
|
|
/**
|
|
* Count number of bits set to one in x
|
|
* @param x value to count bits of
|
|
* @return the number of bits set to one in x
|
|
*/
|
|
static av_always_inline av_const int av_popcount_c(uint32_t x)
|
|
{
|
|
x -= (x >> 1) & 0x55555555;
|
|
x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
|
|
x = (x + (x >> 4)) & 0x0F0F0F0F;
|
|
x += x >> 8;
|
|
return (x + (x >> 16)) & 0x3F;
|
|
}
|
|
|
|
/**
|
|
* Count number of bits set to one in x
|
|
* @param x value to count bits of
|
|
* @return the number of bits set to one in x
|
|
*/
|
|
static av_always_inline av_const int av_popcount64_c(uint64_t x)
|
|
{
|
|
return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
|
|
}
|
|
|
|
static av_always_inline av_const int av_parity_c(uint32_t v)
|
|
{
|
|
return av_popcount(v) & 1;
|
|
}
|
|
|
|
#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
|
|
#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
|
|
|
|
/**
|
|
* Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
|
|
*
|
|
* @param val Output value, must be an lvalue of type uint32_t.
|
|
* @param GET_BYTE Expression reading one byte from the input.
|
|
* Evaluated up to 7 times (4 for the currently
|
|
* assigned Unicode range). With a memory buffer
|
|
* input, this could be *ptr++.
|
|
* @param ERROR Expression to be evaluated on invalid input,
|
|
* typically a goto statement.
|
|
*
|
|
* @warning ERROR should not contain a loop control statement which
|
|
* could interact with the internal while loop, and should force an
|
|
* exit from the macro code (e.g. through a goto or a return) in order
|
|
* to prevent undefined results.
|
|
*/
|
|
#define GET_UTF8(val, GET_BYTE, ERROR)\
|
|
val= (GET_BYTE);\
|
|
{\
|
|
uint32_t top = (val & 128) >> 1;\
|
|
if ((val & 0xc0) == 0x80 || val >= 0xFE)\
|
|
ERROR\
|
|
while (val & top) {\
|
|
int tmp= (GET_BYTE) - 128;\
|
|
if(tmp>>6)\
|
|
ERROR\
|
|
val= (val<<6) + tmp;\
|
|
top <<= 5;\
|
|
}\
|
|
val &= (top << 1) - 1;\
|
|
}
|
|
|
|
/**
|
|
* Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
|
|
*
|
|
* @param val Output value, must be an lvalue of type uint32_t.
|
|
* @param GET_16BIT Expression returning two bytes of UTF-16 data converted
|
|
* to native byte order. Evaluated one or two times.
|
|
* @param ERROR Expression to be evaluated on invalid input,
|
|
* typically a goto statement.
|
|
*/
|
|
#define GET_UTF16(val, GET_16BIT, ERROR)\
|
|
val = GET_16BIT;\
|
|
{\
|
|
unsigned int hi = val - 0xD800;\
|
|
if (hi < 0x800) {\
|
|
val = GET_16BIT - 0xDC00;\
|
|
if (val > 0x3FFU || hi > 0x3FFU)\
|
|
ERROR\
|
|
val += (hi<<10) + 0x10000;\
|
|
}\
|
|
}\
|
|
|
|
/**
|
|
* @def PUT_UTF8(val, tmp, PUT_BYTE)
|
|
* Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
|
|
* @param val is an input-only argument and should be of type uint32_t. It holds
|
|
* a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
|
|
* val is given as a function it is executed only once.
|
|
* @param tmp is a temporary variable and should be of type uint8_t. It
|
|
* represents an intermediate value during conversion that is to be
|
|
* output by PUT_BYTE.
|
|
* @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
|
|
* It could be a function or a statement, and uses tmp as the input byte.
|
|
* For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
|
|
* executed up to 4 times for values in the valid UTF-8 range and up to
|
|
* 7 times in the general case, depending on the length of the converted
|
|
* Unicode character.
|
|
*/
|
|
#define PUT_UTF8(val, tmp, PUT_BYTE)\
|
|
{\
|
|
int bytes, shift;\
|
|
uint32_t in = val;\
|
|
if (in < 0x80) {\
|
|
tmp = in;\
|
|
PUT_BYTE\
|
|
} else {\
|
|
bytes = (av_log2(in) + 4) / 5;\
|
|
shift = (bytes - 1) * 6;\
|
|
tmp = (256 - (256 >> bytes)) | (in >> shift);\
|
|
PUT_BYTE\
|
|
while (shift >= 6) {\
|
|
shift -= 6;\
|
|
tmp = 0x80 | ((in >> shift) & 0x3f);\
|
|
PUT_BYTE\
|
|
}\
|
|
}\
|
|
}
|
|
|
|
/**
|
|
* @def PUT_UTF16(val, tmp, PUT_16BIT)
|
|
* Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
|
|
* @param val is an input-only argument and should be of type uint32_t. It holds
|
|
* a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
|
|
* val is given as a function it is executed only once.
|
|
* @param tmp is a temporary variable and should be of type uint16_t. It
|
|
* represents an intermediate value during conversion that is to be
|
|
* output by PUT_16BIT.
|
|
* @param PUT_16BIT writes the converted UTF-16 data to any proper destination
|
|
* in desired endianness. It could be a function or a statement, and uses tmp
|
|
* as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
|
|
* PUT_BYTE will be executed 1 or 2 times depending on input character.
|
|
*/
|
|
#define PUT_UTF16(val, tmp, PUT_16BIT)\
|
|
{\
|
|
uint32_t in = val;\
|
|
if (in < 0x10000) {\
|
|
tmp = in;\
|
|
PUT_16BIT\
|
|
} else {\
|
|
tmp = 0xD800 | ((in - 0x10000) >> 10);\
|
|
PUT_16BIT\
|
|
tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
|
|
PUT_16BIT\
|
|
}\
|
|
}\
|
|
|
|
|
|
|
|
#include "mem.h"
|
|
|
|
#ifdef HAVE_AV_CONFIG_H
|
|
# include "internal.h"
|
|
#endif /* HAVE_AV_CONFIG_H */
|
|
|
|
#endif /* AVUTIL_COMMON_H */
|
|
|
|
/*
|
|
* The following definitions are outside the multiple inclusion guard
|
|
* to ensure they are immediately available in intmath.h.
|
|
*/
|
|
|
|
#ifndef av_ceil_log2
|
|
# define av_ceil_log2 av_ceil_log2_c
|
|
#endif
|
|
#ifndef av_clip
|
|
# define av_clip av_clip_c
|
|
#endif
|
|
#ifndef av_clip64
|
|
# define av_clip64 av_clip64_c
|
|
#endif
|
|
#ifndef av_clip_uint8
|
|
# define av_clip_uint8 av_clip_uint8_c
|
|
#endif
|
|
#ifndef av_clip_int8
|
|
# define av_clip_int8 av_clip_int8_c
|
|
#endif
|
|
#ifndef av_clip_uint16
|
|
# define av_clip_uint16 av_clip_uint16_c
|
|
#endif
|
|
#ifndef av_clip_int16
|
|
# define av_clip_int16 av_clip_int16_c
|
|
#endif
|
|
#ifndef av_clipl_int32
|
|
# define av_clipl_int32 av_clipl_int32_c
|
|
#endif
|
|
#ifndef av_clip_intp2
|
|
# define av_clip_intp2 av_clip_intp2_c
|
|
#endif
|
|
#ifndef av_clip_uintp2
|
|
# define av_clip_uintp2 av_clip_uintp2_c
|
|
#endif
|
|
#ifndef av_mod_uintp2
|
|
# define av_mod_uintp2 av_mod_uintp2_c
|
|
#endif
|
|
#ifndef av_sat_add32
|
|
# define av_sat_add32 av_sat_add32_c
|
|
#endif
|
|
#ifndef av_sat_dadd32
|
|
# define av_sat_dadd32 av_sat_dadd32_c
|
|
#endif
|
|
#ifndef av_clipf
|
|
# define av_clipf av_clipf_c
|
|
#endif
|
|
#ifndef av_clipd
|
|
# define av_clipd av_clipd_c
|
|
#endif
|
|
#ifndef av_popcount
|
|
# define av_popcount av_popcount_c
|
|
#endif
|
|
#ifndef av_popcount64
|
|
# define av_popcount64 av_popcount64_c
|
|
#endif
|
|
#ifndef av_parity
|
|
# define av_parity av_parity_c
|
|
#endif
|