mirror of
https://github.com/FFmpeg/FFmpeg.git
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fda1c74539
Signed-off-by: Dale Curtis <dalecurtis@chromium.org> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
609 lines
18 KiB
C
609 lines
18 KiB
C
/*
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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 and external API header
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*/
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#ifndef AVUTIL_COMMON_H
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#define AVUTIL_COMMON_H
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#if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
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#error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
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#endif
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <math.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "attributes.h"
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#include "macros.h"
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#include "version.h"
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#include "libavutil/avconfig.h"
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#if AV_HAVE_BIGENDIAN
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# define AV_NE(be, le) (be)
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#else
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# define AV_NE(be, le) (le)
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#endif
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//rounded division & shift
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#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
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/* assume b>0 */
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#define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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/* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
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#define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
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: ((a) + (1<<(b)) - 1) >> (b))
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/* Backwards compat. */
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#define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
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#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
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#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
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/**
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* Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
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* are not representable as absolute values of their type. This is the same
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* as with *abs()
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* @see FFNABS()
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*/
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#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
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#define FFSIGN(a) ((a) > 0 ? 1 : -1)
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/**
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* Negative Absolute value.
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* this works for all integers of all types.
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* As with many macros, this evaluates its argument twice, it thus must not have
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* a sideeffect, that is FFNABS(x++) has undefined behavior.
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*/
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#define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
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/**
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* Comparator.
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* For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0
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* if x == y. This is useful for instance in a qsort comparator callback.
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* Furthermore, compilers are able to optimize this to branchless code, and
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* there is no risk of overflow with signed types.
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* As with many macros, this evaluates its argument multiple times, it thus
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* must not have a side-effect.
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*/
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#define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))
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#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
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#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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#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)
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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/* misc math functions */
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#ifdef HAVE_AV_CONFIG_H
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# include "config.h"
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# include "intmath.h"
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#endif
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/* Pull in unguarded fallback defines at the end of this file. */
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#include "common.h"
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#ifndef av_log2
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av_const int av_log2(unsigned v);
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#endif
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#ifndef av_log2_16bit
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av_const int av_log2_16bit(unsigned v);
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#endif
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/**
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* Clip a signed integer value into the amin-amax range.
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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 int av_clip_c(int a, int amin, int amax)
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{
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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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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/**
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* Clip a signed 64bit integer value into the amin-amax range.
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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 av_clip64_c(int64_t a, int64_t amin, int64_t amax)
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{
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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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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/**
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* Clip a signed integer value into the 0-255 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
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{
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if (a&(~0xFF)) return (~a)>>31;
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else return a;
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}
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/**
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* Clip a signed integer value into the -128,127 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int8_t av_clip_int8_c(int a)
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{
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if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
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else return a;
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}
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/**
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* Clip a signed integer value into the 0-65535 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
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{
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if (a&(~0xFFFF)) return (~a)>>31;
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else return a;
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}
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/**
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* Clip a signed integer value into the -32768,32767 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int16_t av_clip_int16_c(int a)
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{
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if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
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else return a;
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}
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/**
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* Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
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* @param a value to clip
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* @return clipped value
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*/
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static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
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{
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if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
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else return (int32_t)a;
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}
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/**
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* Clip a signed integer into the -(2^p),(2^p-1) range.
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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static av_always_inline av_const int av_clip_intp2_c(int a, int p)
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{
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if (((unsigned)a + (1 << p)) & ~((2 << p) - 1))
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return (a >> 31) ^ ((1 << p) - 1);
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else
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return a;
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}
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/**
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* Clip a signed integer to an unsigned power of two range.
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
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{
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if (a & ~((1<<p) - 1)) return (~a) >> 31 & ((1<<p) - 1);
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else return a;
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}
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/**
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* Clear high bits from an unsigned integer starting with specific bit position
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* @param a value to clip
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* @param p bit position to clip at
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* @return clipped value
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*/
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static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
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{
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return a & ((1U << p) - 1);
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}
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/**
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* Add two signed 32-bit values with saturation.
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*
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* @param a one value
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* @param b another value
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* @return sum with signed saturation
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*/
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static av_always_inline int av_sat_add32_c(int a, int b)
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{
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return av_clipl_int32((int64_t)a + b);
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}
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/**
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* Add a doubled value to another value with saturation at both stages.
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*
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* @param a first value
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* @param b value doubled and added to a
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* @return sum sat(a + sat(2*b)) with signed saturation
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*/
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static av_always_inline int av_sat_dadd32_c(int a, int b)
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{
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return av_sat_add32(a, av_sat_add32(b, b));
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}
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/**
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* Subtract two signed 32-bit values with saturation.
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*
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* @param a one value
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* @param b another value
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* @return difference with signed saturation
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*/
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static av_always_inline int av_sat_sub32_c(int a, int b)
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{
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return av_clipl_int32((int64_t)a - b);
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}
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/**
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* Subtract a doubled value from another value with saturation at both stages.
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*
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* @param a first value
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* @param b value doubled and subtracted from a
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* @return difference sat(a - sat(2*b)) with signed saturation
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*/
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static av_always_inline int av_sat_dsub32_c(int a, int b)
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{
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return av_sat_sub32(a, av_sat_add32(b, b));
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}
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/**
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* Add two signed 64-bit values with saturation.
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*
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* @param a one value
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* @param b another value
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* @return sum with signed saturation
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*/
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static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
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#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
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int64_t tmp;
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return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
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#else
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if (b >= 0 && a >= INT64_MAX - b)
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return INT64_MAX;
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if (b <= 0 && a <= INT64_MIN - b)
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return INT64_MIN;
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return a + b;
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#endif
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}
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/**
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* Subtract two signed 64-bit values with saturation.
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*
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* @param a one value
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* @param b another value
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* @return difference with signed saturation
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*/
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static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
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#if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
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int64_t tmp;
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return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
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#else
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if (b <= 0 && a >= INT64_MAX + b)
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return INT64_MAX;
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if (b >= 0 && a <= INT64_MIN + b)
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return INT64_MIN;
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return a - b;
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#endif
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}
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/**
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* Clip a float value into the amin-amax range.
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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 float av_clipf_c(float a, float amin, float amax)
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{
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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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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/**
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* Clip a double value into the amin-amax range.
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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 double av_clipd_c(double a, double amin, double amax)
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{
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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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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/** Compute ceil(log2(x)).
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* @param x value used to compute ceil(log2(x))
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* @return computed ceiling of log2(x)
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*/
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static av_always_inline av_const int av_ceil_log2_c(int x)
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{
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return av_log2((x - 1) << 1);
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}
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/**
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* Count number of bits set to one in x
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* @param x value to count bits of
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* @return the number of bits set to one in x
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*/
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static av_always_inline av_const int av_popcount_c(uint32_t x)
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{
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x -= (x >> 1) & 0x55555555;
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x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
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x = (x + (x >> 4)) & 0x0F0F0F0F;
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x += x >> 8;
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return (x + (x >> 16)) & 0x3F;
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}
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/**
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* Count number of bits set to one in x
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* @param x value to count bits of
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* @return the number of bits set to one in x
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*/
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static av_always_inline av_const int av_popcount64_c(uint64_t x)
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{
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return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
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}
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static av_always_inline av_const int av_parity_c(uint32_t v)
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{
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return av_popcount(v) & 1;
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}
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#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
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#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
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/**
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* Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
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*
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* @param val Output value, must be an lvalue of type uint32_t.
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* @param GET_BYTE Expression reading one byte from the input.
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* Evaluated up to 7 times (4 for the currently
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* assigned Unicode range). With a memory buffer
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* input, this could be *ptr++, or if you want to make sure
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* that *ptr stops at the end of a NULL terminated string then
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* *ptr ? *ptr++ : 0
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* @param ERROR Expression to be evaluated on invalid input,
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* typically a goto statement.
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*
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* @warning ERROR should not contain a loop control statement which
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* could interact with the internal while loop, and should force an
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* exit from the macro code (e.g. through a goto or a return) in order
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* to prevent undefined results.
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*/
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#define GET_UTF8(val, GET_BYTE, ERROR)\
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val= (GET_BYTE);\
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{\
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uint32_t top = (val & 128) >> 1;\
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if ((val & 0xc0) == 0x80 || val >= 0xFE)\
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{ERROR}\
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while (val & top) {\
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unsigned int tmp = (GET_BYTE) - 128;\
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if(tmp>>6)\
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{ERROR}\
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val= (val<<6) + tmp;\
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top <<= 5;\
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}\
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val &= (top << 1) - 1;\
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}
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/**
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* Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
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*
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* @param val Output value, must be an lvalue of type uint32_t.
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* @param GET_16BIT Expression returning two bytes of UTF-16 data converted
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* to native byte order. Evaluated one or two times.
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* @param ERROR Expression to be evaluated on invalid input,
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* typically a goto statement.
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*/
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#define GET_UTF16(val, GET_16BIT, ERROR)\
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val = (GET_16BIT);\
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{\
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unsigned int hi = val - 0xD800;\
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if (hi < 0x800) {\
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val = (GET_16BIT) - 0xDC00;\
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if (val > 0x3FFU || hi > 0x3FFU)\
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{ERROR}\
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val += (hi<<10) + 0x10000;\
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}\
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}\
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/**
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* @def PUT_UTF8(val, tmp, PUT_BYTE)
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* Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
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* @param val is an input-only argument and should be of type uint32_t. It holds
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* a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
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* val is given as a function it is executed only once.
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* @param tmp is a temporary variable and should be of type uint8_t. It
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* represents an intermediate value during conversion that is to be
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* output by PUT_BYTE.
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* @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
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* It could be a function or a statement, and uses tmp as the input byte.
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* 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_sat_sub32
|
|
# define av_sat_sub32 av_sat_sub32_c
|
|
#endif
|
|
#ifndef av_sat_dsub32
|
|
# define av_sat_dsub32 av_sat_dsub32_c
|
|
#endif
|
|
#ifndef av_sat_add64
|
|
# define av_sat_add64 av_sat_add64_c
|
|
#endif
|
|
#ifndef av_sat_sub64
|
|
# define av_sat_sub64 av_sat_sub64_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
|