0,0 → 1,464 |
/* |
* 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 |
*/ |
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#ifndef AVUTIL_COMMON_H |
#define AVUTIL_COMMON_H |
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#include <errno.h> |
#include <inttypes.h> |
#include <limits.h> |
#include <math.h> |
#include <stdio.h> |
#include <stdlib.h> |
#include <string.h> |
|
#include "attributes.h" |
#include "version.h" |
#include "libavutil/avconfig.h" |
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#if AV_HAVE_BIGENDIAN |
# define AV_NE(be, le) (be) |
#else |
# define AV_NE(be, le) (le) |
#endif |
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//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)) |
/* assume a>0 and b>0 */ |
#define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ |
: ((a) + (1<<(b)) - 1) >> (b)) |
#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b)) |
#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b)) |
#define FFABS(a) ((a) >= 0 ? (a) : (-(a))) |
#define FFSIGN(a) ((a) > 0 ? 1 : -1) |
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#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) |
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#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])) |
#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) |
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/* misc math functions */ |
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/** |
* Reverse the order of the bits of an 8-bits unsigned integer. |
*/ |
#if FF_API_AV_REVERSE |
extern attribute_deprecated const uint8_t av_reverse[256]; |
#endif |
|
#ifdef HAVE_AV_CONFIG_H |
# include "config.h" |
# include "intmath.h" |
#endif |
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/* Pull in unguarded fallback defines at the end of this file. */ |
#include "common.h" |
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#ifndef av_log2 |
av_const int av_log2(unsigned v); |
#endif |
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#ifndef av_log2_16bit |
av_const int av_log2_16bit(unsigned v); |
#endif |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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+0x80) & ~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; |
} |
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/** |
* 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+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF; |
else return a; |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** |
* 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); |
} |
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/** |
* 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)); |
} |
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/** |
* 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; |
} |
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/** |
* 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; |
} |
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/** 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); |
} |
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/** |
* 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; |
} |
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/** |
* 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)); |
} |
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#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)) |
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/** |
* 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;\ |
} |
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/** |
* 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;\ |
}\ |
}\ |
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/** |
* @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\ |
}\ |
}\ |
} |
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/** |
* @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\ |
}\ |
}\ |
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#include "mem.h" |
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#ifdef HAVE_AV_CONFIG_H |
# include "internal.h" |
#endif /* HAVE_AV_CONFIG_H */ |
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#endif /* AVUTIL_COMMON_H */ |
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/* |
* The following definitions are outside the multiple inclusion guard |
* to ensure they are immediately available in intmath.h. |
*/ |
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#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_uintp2 |
# define av_clip_uintp2 av_clip_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 |