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- /*
- * 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
- #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"
- #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))
- #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)
- #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]))
- #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
- /* misc math functions */
- /**
- * 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
- /* 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+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;
- }
- /**
- * 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;
- }
- /**
- * 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 (a>>63) ^ 0x7FFFFFFF;
- else return (int32_t)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;
- }
- /**
- * 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;
- }
- /** 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(x >> 32);
- }
- #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.
- */
- #define GET_UTF8(val, GET_BYTE, ERROR)\
- val= GET_BYTE;\
- {\
- uint32_t top = (val & 128) >> 1;\
- if ((val & 0xc0) == 0x80)\
- 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_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_popcount
- # define av_popcount av_popcount_c
- #endif
- #ifndef av_popcount64
- # define av_popcount64 av_popcount64_c
- #endif
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