author | Wuzzy <almikes@aol.com> |
Sat, 15 Apr 2017 06:52:14 +0200 | |
changeset 12256 | 789277d46784 |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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#include <ctype.h> |
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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 <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 "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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#define FFABS(a) ((a) >= 0 ? (a) : (-(a))) |
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#define FFSIGN(a) ((a) > 0 ? 1 : -1) |
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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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#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) |
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/* misc math functions */ |
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#if FF_API_AV_REVERSE |
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extern attribute_deprecated const uint8_t av_reverse[256]; |
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#endif |
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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 (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+0x80) & ~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+0x8000) & ~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 (a>>63) ^ 0x7FFFFFFF; |
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152 |
else return a; |
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153 |
} |
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|
154 |
|
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|
155 |
/** |
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|
156 |
* Clip a signed integer to an unsigned power of two range. |
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|
157 |
* @param a value to clip |
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158 |
* @param p bit position to clip at |
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159 |
* @return clipped value |
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160 |
*/ |
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161 |
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p) |
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{ |
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163 |
if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1); |
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else return a; |
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165 |
} |
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|
166 |
|
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|
167 |
/** |
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|
168 |
* Add two signed 32-bit values with saturation. |
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169 |
* |
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170 |
* @param a one value |
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171 |
* @param b another value |
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172 |
* @return sum with signed saturation |
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173 |
*/ |
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174 |
static av_always_inline int av_sat_add32_c(int a, int b) |
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{ |
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176 |
return av_clipl_int32((int64_t)a + b); |
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177 |
} |
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178 |
|
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179 |
/** |
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180 |
* Add a doubled value to another value with saturation at both stages. |
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* |
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182 |
* @param a first value |
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183 |
* @param b value doubled and added to a |
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184 |
* @return sum with signed saturation |
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185 |
*/ |
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186 |
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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189 |
} |
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|
190 |
|
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|
191 |
/** |
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|
192 |
* Clip a float value into the amin-amax range. |
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|
193 |
* @param a value to clip |
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194 |
* @param amin minimum value of the clip range |
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195 |
* @param amax maximum value of the clip range |
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196 |
* @return clipped value |
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197 |
*/ |
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|
198 |
static av_always_inline av_const float av_clipf_c(float a, float amin, float amax) |
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{ |
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200 |
if (a < amin) return amin; |
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201 |
else if (a > amax) return amax; |
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202 |
else return a; |
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203 |
} |
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|
204 |
|
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|
205 |
/** Compute ceil(log2(x)). |
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206 |
* @param x value used to compute ceil(log2(x)) |
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207 |
* @return computed ceiling of log2(x) |
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208 |
*/ |
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|
209 |
static av_always_inline av_const int av_ceil_log2_c(int x) |
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|
210 |
{ |
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|
211 |
return av_log2((x - 1) << 1); |
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|
212 |
} |
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|
213 |
|
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|
214 |
/** |
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|
215 |
* Count number of bits set to one in x |
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|
216 |
* @param x value to count bits of |
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|
217 |
* @return the number of bits set to one in x |
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|
218 |
*/ |
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|
219 |
static av_always_inline av_const int av_popcount_c(uint32_t x) |
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|
220 |
{ |
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|
221 |
x -= (x >> 1) & 0x55555555; |
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|
222 |
x = (x & 0x33333333) + ((x >> 2) & 0x33333333); |
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223 |
x = (x + (x >> 4)) & 0x0F0F0F0F; |
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|
224 |
x += x >> 8; |
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|
225 |
return (x + (x >> 16)) & 0x3F; |
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|
226 |
} |
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|
227 |
|
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|
228 |
/** |
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|
229 |
* Count number of bits set to one in x |
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|
230 |
* @param x value to count bits of |
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|
231 |
* @return the number of bits set to one in x |
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|
232 |
*/ |
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|
233 |
static av_always_inline av_const int av_popcount64_c(uint64_t x) |
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|
234 |
{ |
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|
235 |
return av_popcount(x) + av_popcount(x >> 32); |
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|
236 |
} |
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|
237 |
|
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|
238 |
#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24)) |
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|
239 |
#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24)) |
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|
240 |
|
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|
241 |
/** |
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|
242 |
* Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form. |
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|
243 |
* |
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|
244 |
* @param val Output value, must be an lvalue of type uint32_t. |
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|
245 |
* @param GET_BYTE Expression reading one byte from the input. |
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|
246 |
* Evaluated up to 7 times (4 for the currently |
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|
247 |
* assigned Unicode range). With a memory buffer |
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|
248 |
* input, this could be *ptr++. |
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|
249 |
* @param ERROR Expression to be evaluated on invalid input, |
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|
250 |
* typically a goto statement. |
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|
251 |
*/ |
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|
252 |
#define GET_UTF8(val, GET_BYTE, ERROR)\ |
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|
253 |
val= GET_BYTE;\ |
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|
254 |
{\ |
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|
255 |
int ones= 7 - av_log2(val ^ 255);\ |
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|
256 |
if(ones==1)\ |
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|
257 |
ERROR\ |
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|
258 |
val&= 127>>ones;\ |
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|
259 |
while(--ones > 0){\ |
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|
260 |
int tmp= GET_BYTE - 128;\ |
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|
261 |
if(tmp>>6)\ |
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|
262 |
ERROR\ |
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|
263 |
val= (val<<6) + tmp;\ |
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|
264 |
}\ |
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|
265 |
} |
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|
266 |
|
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|
267 |
/** |
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|
268 |
* Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form. |
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|
269 |
* |
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|
270 |
* @param val Output value, must be an lvalue of type uint32_t. |
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|
271 |
* @param GET_16BIT Expression returning two bytes of UTF-16 data converted |
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|
272 |
* to native byte order. Evaluated one or two times. |
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|
273 |
* @param ERROR Expression to be evaluated on invalid input, |
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|
274 |
* typically a goto statement. |
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|
275 |
*/ |
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|
276 |
#define GET_UTF16(val, GET_16BIT, ERROR)\ |
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|
277 |
val = GET_16BIT;\ |
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|
278 |
{\ |
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|
279 |
unsigned int hi = val - 0xD800;\ |
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|
280 |
if (hi < 0x800) {\ |
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|
281 |
val = GET_16BIT - 0xDC00;\ |
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|
282 |
if (val > 0x3FFU || hi > 0x3FFU)\ |
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|
283 |
ERROR\ |
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|
284 |
val += (hi<<10) + 0x10000;\ |
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|
285 |
}\ |
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|
286 |
}\ |
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parents:
diff
changeset
|
287 |
|
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diff
changeset
|
288 |
/** |
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|
289 |
* @def PUT_UTF8(val, tmp, PUT_BYTE) |
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|
290 |
* Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long). |
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|
291 |
* @param val is an input-only argument and should be of type uint32_t. It holds |
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|
292 |
* a UCS-4 encoded Unicode character that is to be converted to UTF-8. If |
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|
293 |
* val is given as a function it is executed only once. |
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|
294 |
* @param tmp is a temporary variable and should be of type uint8_t. It |
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|
295 |
* represents an intermediate value during conversion that is to be |
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|
296 |
* output by PUT_BYTE. |
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|
297 |
* @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination. |
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|
298 |
* It could be a function or a statement, and uses tmp as the input byte. |
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|
299 |
* For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be |
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|
300 |
* executed up to 4 times for values in the valid UTF-8 range and up to |
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|
301 |
* 7 times in the general case, depending on the length of the converted |
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|
302 |
* Unicode character. |
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303 |
*/ |
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304 |
#define PUT_UTF8(val, tmp, PUT_BYTE)\ |
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305 |
{\ |
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306 |
int bytes, shift;\ |
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307 |
uint32_t in = val;\ |
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308 |
if (in < 0x80) {\ |
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309 |
tmp = in;\ |
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310 |
PUT_BYTE\ |
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311 |
} else {\ |
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312 |
bytes = (av_log2(in) + 4) / 5;\ |
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313 |
shift = (bytes - 1) * 6;\ |
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314 |
tmp = (256 - (256 >> bytes)) | (in >> shift);\ |
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315 |
PUT_BYTE\ |
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316 |
while (shift >= 6) {\ |
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317 |
shift -= 6;\ |
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318 |
tmp = 0x80 | ((in >> shift) & 0x3f);\ |
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319 |
PUT_BYTE\ |
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320 |
}\ |
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321 |
}\ |
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322 |
} |
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323 |
|
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324 |
/** |
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325 |
* @def PUT_UTF16(val, tmp, PUT_16BIT) |
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326 |
* Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes). |
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327 |
* @param val is an input-only argument and should be of type uint32_t. It holds |
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328 |
* a UCS-4 encoded Unicode character that is to be converted to UTF-16. If |
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329 |
* val is given as a function it is executed only once. |
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330 |
* @param tmp is a temporary variable and should be of type uint16_t. It |
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331 |
* represents an intermediate value during conversion that is to be |
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332 |
* output by PUT_16BIT. |
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333 |
* @param PUT_16BIT writes the converted UTF-16 data to any proper destination |
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|
334 |
* in desired endianness. It could be a function or a statement, and uses tmp |
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335 |
* as the input byte. For example, PUT_BYTE could be "*output++ = tmp;" |
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336 |
* PUT_BYTE will be executed 1 or 2 times depending on input character. |
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|
337 |
*/ |
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338 |
#define PUT_UTF16(val, tmp, PUT_16BIT)\ |
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|
339 |
{\ |
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340 |
uint32_t in = val;\ |
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|
341 |
if (in < 0x10000) {\ |
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|
342 |
tmp = in;\ |
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|
343 |
PUT_16BIT\ |
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|
344 |
} else {\ |
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345 |
tmp = 0xD800 | ((in - 0x10000) >> 10);\ |
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346 |
PUT_16BIT\ |
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347 |
tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\ |
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348 |
PUT_16BIT\ |
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349 |
}\ |
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350 |
}\ |
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|
351 |
|
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|
352 |
|
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|
353 |
|
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|
354 |
#include "mem.h" |
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|
355 |
|
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|
356 |
#ifdef HAVE_AV_CONFIG_H |
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|
357 |
# include "internal.h" |
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|
358 |
#endif /* HAVE_AV_CONFIG_H */ |
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|
359 |
|
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360 |
#endif /* AVUTIL_COMMON_H */ |
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|
361 |
|
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|
362 |
/* |
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|
363 |
* The following definitions are outside the multiple inclusion guard |
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|
364 |
* to ensure they are immediately available in intmath.h. |
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|
365 |
*/ |
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|
366 |
|
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|
367 |
#ifndef av_ceil_log2 |
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|
368 |
# define av_ceil_log2 av_ceil_log2_c |
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|
369 |
#endif |
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|
370 |
#ifndef av_clip |
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|
371 |
# define av_clip av_clip_c |
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|
372 |
#endif |
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|
373 |
#ifndef av_clip_uint8 |
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|
374 |
# define av_clip_uint8 av_clip_uint8_c |
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|
375 |
#endif |
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|
376 |
#ifndef av_clip_int8 |
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|
377 |
# define av_clip_int8 av_clip_int8_c |
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|
378 |
#endif |
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|
379 |
#ifndef av_clip_uint16 |
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|
380 |
# define av_clip_uint16 av_clip_uint16_c |
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|
381 |
#endif |
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|
382 |
#ifndef av_clip_int16 |
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|
383 |
# define av_clip_int16 av_clip_int16_c |
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|
384 |
#endif |
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|
385 |
#ifndef av_clipl_int32 |
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|
386 |
# define av_clipl_int32 av_clipl_int32_c |
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|
387 |
#endif |
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|
388 |
#ifndef av_clip_uintp2 |
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|
389 |
# define av_clip_uintp2 av_clip_uintp2_c |
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|
390 |
#endif |
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|
391 |
#ifndef av_sat_add32 |
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|
392 |
# define av_sat_add32 av_sat_add32_c |
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|
393 |
#endif |
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|
394 |
#ifndef av_sat_dadd32 |
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|
395 |
# define av_sat_dadd32 av_sat_dadd32_c |
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|
396 |
#endif |
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|
397 |
#ifndef av_clipf |
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|
398 |
# define av_clipf av_clipf_c |
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|
399 |
#endif |
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|
400 |
#ifndef av_popcount |
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|
401 |
# define av_popcount av_popcount_c |
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|
402 |
#endif |
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|
403 |
#ifndef av_popcount64 |
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|
404 |
# define av_popcount64 av_popcount64_c |
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|
405 |
#endif |