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2134
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1 /*
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2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 /**
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22 * @file
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23 * common internal and external API header
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24 */
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25
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26 #ifndef AVUTIL_COMMON_H
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27 #define AVUTIL_COMMON_H
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28
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29 #include <errno.h>
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30 #include <stdint.h>
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31 #include <limits.h>
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32 #include <math.h>
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33 #include <stdio.h>
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34 #include <stdlib.h>
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35 #include <string.h>
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36
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37 #include "attributes.h"
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38 #include "version.h"
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39 #include "avconfig.h"
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40
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41 #if AV_HAVE_BIGENDIAN
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42 # define AV_NE(be, le) (be)
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43 #else
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44 # define AV_NE(be, le) (le)
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45 #endif
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46
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47 //rounded division & shift
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48 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
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49 /* assume b>0 */
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50 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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51 /* assume a>0 and b>0 */
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52 #define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
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53 : ((a) + (1<<(b)) - 1) >> (b))
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54 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
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55 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
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56 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
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57 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
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58
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59 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
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60 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
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61 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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62 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
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63
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64 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
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65 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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66 #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
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67
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68 /* misc math functions */
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69
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70 /**
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71 * Reverse the order of the bits of an 8-bits unsigned integer.
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72 */
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73 #if FF_API_AV_REVERSE
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74 extern attribute_deprecated const uint8_t av_reverse[256];
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75 #endif
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76
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77 #ifdef HAVE_AV_CONFIG_H
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78 # include "config.h"
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79 # include "intmath.h"
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80 #endif
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81
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82 /* Pull in unguarded fallback defines at the end of this file. */
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83 #include "common.h"
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84
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85 #ifndef av_log2
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86 av_const int av_log2(unsigned v);
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87 #endif
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88
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89 #ifndef av_log2_16bit
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90 av_const int av_log2_16bit(unsigned v);
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91 #endif
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92
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93 /**
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94 * Clip a signed integer value into the amin-amax range.
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95 * @param a value to clip
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96 * @param amin minimum value of the clip range
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97 * @param amax maximum value of the clip range
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98 * @return clipped value
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99 */
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100 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
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101 {
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102 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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103 if (amin > amax) abort();
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104 #endif
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105 if (a < amin) return amin;
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106 else if (a > amax) return amax;
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107 else return a;
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108 }
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109
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110 /**
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111 * Clip a signed 64bit integer value into the amin-amax range.
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112 * @param a value to clip
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113 * @param amin minimum value of the clip range
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114 * @param amax maximum value of the clip range
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115 * @return clipped value
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116 */
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117 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
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118 {
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119 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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120 if (amin > amax) abort();
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121 #endif
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122 if (a < amin) return amin;
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123 else if (a > amax) return amax;
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124 else return a;
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125 }
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126
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127 /**
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128 * Clip a signed integer value into the 0-255 range.
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129 * @param a value to clip
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130 * @return clipped value
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131 */
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132 static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
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133 {
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134 if (a&(~0xFF)) return (-a)>>31;
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135 else return a;
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136 }
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137
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138 /**
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139 * Clip a signed integer value into the -128,127 range.
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140 * @param a value to clip
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141 * @return clipped value
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142 */
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143 static av_always_inline av_const int8_t av_clip_int8_c(int a)
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144 {
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145 if ((a+0x80) & ~0xFF) return (a>>31) ^ 0x7F;
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146 else return a;
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147 }
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148
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149 /**
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150 * Clip a signed integer value into the 0-65535 range.
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151 * @param a value to clip
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152 * @return clipped value
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153 */
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154 static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
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155 {
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156 if (a&(~0xFFFF)) return (-a)>>31;
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157 else return a;
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158 }
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159
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160 /**
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161 * Clip a signed integer value into the -32768,32767 range.
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162 * @param a value to clip
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163 * @return clipped value
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164 */
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165 static av_always_inline av_const int16_t av_clip_int16_c(int a)
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166 {
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167 if ((a+0x8000) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
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168 else return a;
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169 }
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170
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171 /**
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172 * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
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173 * @param a value to clip
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174 * @return clipped value
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175 */
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176 static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
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177 {
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178 if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (a>>63) ^ 0x7FFFFFFF;
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179 else return (int32_t)a;
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180 }
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181
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182 /**
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183 * Clip a signed integer to an unsigned power of two range.
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184 * @param a value to clip
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185 * @param p bit position to clip at
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186 * @return clipped value
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187 */
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188 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
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189 {
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190 if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
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191 else return a;
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192 }
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193
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194 /**
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195 * Add two signed 32-bit values with saturation.
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196 *
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197 * @param a one value
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198 * @param b another value
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199 * @return sum with signed saturation
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200 */
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201 static av_always_inline int av_sat_add32_c(int a, int b)
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202 {
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203 return av_clipl_int32((int64_t)a + b);
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204 }
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205
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206 /**
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207 * Add a doubled value to another value with saturation at both stages.
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208 *
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209 * @param a first value
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210 * @param b value doubled and added to a
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211 * @return sum with signed saturation
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212 */
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213 static av_always_inline int av_sat_dadd32_c(int a, int b)
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214 {
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215 return av_sat_add32(a, av_sat_add32(b, b));
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216 }
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217
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218 /**
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219 * Clip a float value into the amin-amax range.
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220 * @param a value to clip
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221 * @param amin minimum value of the clip range
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222 * @param amax maximum value of the clip range
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223 * @return clipped value
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224 */
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225 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
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226 {
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227 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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228 if (amin > amax) abort();
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229 #endif
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230 if (a < amin) return amin;
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231 else if (a > amax) return amax;
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232 else return a;
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233 }
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234
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235 /**
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236 * Clip a double value into the amin-amax range.
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237 * @param a value to clip
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238 * @param amin minimum value of the clip range
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239 * @param amax maximum value of the clip range
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240 * @return clipped value
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241 */
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242 static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
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243 {
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244 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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245 if (amin > amax) abort();
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246 #endif
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247 if (a < amin) return amin;
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248 else if (a > amax) return amax;
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249 else return a;
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250 }
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251
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252 /** Compute ceil(log2(x)).
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253 * @param x value used to compute ceil(log2(x))
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254 * @return computed ceiling of log2(x)
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255 */
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256 static av_always_inline av_const int av_ceil_log2_c(int x)
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257 {
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258 return av_log2((x - 1) << 1);
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259 }
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260
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261 /**
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262 * Count number of bits set to one in x
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263 * @param x value to count bits of
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264 * @return the number of bits set to one in x
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265 */
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266 static av_always_inline av_const int av_popcount_c(uint32_t x)
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267 {
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268 x -= (x >> 1) & 0x55555555;
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269 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
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270 x = (x + (x >> 4)) & 0x0F0F0F0F;
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271 x += x >> 8;
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272 return (x + (x >> 16)) & 0x3F;
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273 }
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274
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275 /**
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276 * Count number of bits set to one in x
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277 * @param x value to count bits of
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278 * @return the number of bits set to one in x
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279 */
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280 static av_always_inline av_const int av_popcount64_c(uint64_t x)
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281 {
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282 return av_popcount((uint32_t)x) + av_popcount(x >> 32);
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283 }
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284
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285 #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
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286 #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
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287
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288 /**
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289 * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
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290 *
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291 * @param val Output value, must be an lvalue of type uint32_t.
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292 * @param GET_BYTE Expression reading one byte from the input.
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293 * Evaluated up to 7 times (4 for the currently
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294 * assigned Unicode range). With a memory buffer
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295 * input, this could be *ptr++.
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296 * @param ERROR Expression to be evaluated on invalid input,
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297 * typically a goto statement.
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298 */
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299 #define GET_UTF8(val, GET_BYTE, ERROR)\
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300 val= GET_BYTE;\
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301 {\
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302 uint32_t top = (val & 128) >> 1;\
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303 if ((val & 0xc0) == 0x80 || val >= 0xFE)\
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304 ERROR\
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305 while (val & top) {\
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306 int tmp= GET_BYTE - 128;\
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307 if(tmp>>6)\
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308 ERROR\
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309 val= (val<<6) + tmp;\
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310 top <<= 5;\
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311 }\
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312 val &= (top << 1) - 1;\
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313 }
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314
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315 /**
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316 * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
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317 *
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318 * @param val Output value, must be an lvalue of type uint32_t.
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319 * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
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320 * to native byte order. Evaluated one or two times.
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321 * @param ERROR Expression to be evaluated on invalid input,
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322 * typically a goto statement.
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323 */
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324 #define GET_UTF16(val, GET_16BIT, ERROR)\
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325 val = GET_16BIT;\
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326 {\
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327 unsigned int hi = val - 0xD800;\
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328 if (hi < 0x800) {\
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329 val = GET_16BIT - 0xDC00;\
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330 if (val > 0x3FFU || hi > 0x3FFU)\
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331 ERROR\
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332 val += (hi<<10) + 0x10000;\
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333 }\
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334 }\
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335
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336 /**
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337 * @def PUT_UTF8(val, tmp, PUT_BYTE)
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338 * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
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339 * @param val is an input-only argument and should be of type uint32_t. It holds
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340 * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
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341 * val is given as a function it is executed only once.
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342 * @param tmp is a temporary variable and should be of type uint8_t. It
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343 * represents an intermediate value during conversion that is to be
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344 * output by PUT_BYTE.
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345 * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
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346 * It could be a function or a statement, and uses tmp as the input byte.
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347 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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348 * executed up to 4 times for values in the valid UTF-8 range and up to
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349 * 7 times in the general case, depending on the length of the converted
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350 * Unicode character.
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351 */
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352 #define PUT_UTF8(val, tmp, PUT_BYTE)\
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353 {\
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354 int bytes, shift;\
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355 uint32_t in = val;\
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356 if (in < 0x80) {\
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357 tmp = in;\
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358 PUT_BYTE\
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359 } else {\
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360 bytes = (av_log2(in) + 4) / 5;\
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361 shift = (bytes - 1) * 6;\
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362 tmp = (256 - (256 >> bytes)) | (in >> shift);\
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363 PUT_BYTE\
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364 while (shift >= 6) {\
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365 shift -= 6;\
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366 tmp = 0x80 | ((in >> shift) & 0x3f);\
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367 PUT_BYTE\
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368 }\
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369 }\
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370 }
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371
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372 /**
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373 * @def PUT_UTF16(val, tmp, PUT_16BIT)
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374 * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
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375 * @param val is an input-only argument and should be of type uint32_t. It holds
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376 * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
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377 * val is given as a function it is executed only once.
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378 * @param tmp is a temporary variable and should be of type uint16_t. It
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379 * represents an intermediate value during conversion that is to be
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380 * output by PUT_16BIT.
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381 * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
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382 * in desired endianness. It could be a function or a statement, and uses tmp
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383 * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
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384 * PUT_BYTE will be executed 1 or 2 times depending on input character.
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385 */
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386 #define PUT_UTF16(val, tmp, PUT_16BIT)\
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387 {\
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388 uint32_t in = val;\
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389 if (in < 0x10000) {\
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390 tmp = in;\
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391 PUT_16BIT\
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392 } else {\
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393 tmp = 0xD800 | ((in - 0x10000) >> 10);\
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394 PUT_16BIT\
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395 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
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396 PUT_16BIT\
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397 }\
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398 }\
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399
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400
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401
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402 #include "mem.h"
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403
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404 #ifdef HAVE_AV_CONFIG_H
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405 # include "internal.h"
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406 #endif /* HAVE_AV_CONFIG_H */
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407
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408 #endif /* AVUTIL_COMMON_H */
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409
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410 /*
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411 * The following definitions are outside the multiple inclusion guard
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412 * to ensure they are immediately available in intmath.h.
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413 */
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414
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415 #ifndef av_ceil_log2
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416 # define av_ceil_log2 av_ceil_log2_c
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417 #endif
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418 #ifndef av_clip
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419 # define av_clip av_clip_c
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420 #endif
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421 #ifndef av_clip64
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422 # define av_clip64 av_clip64_c
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423 #endif
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424 #ifndef av_clip_uint8
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425 # define av_clip_uint8 av_clip_uint8_c
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426 #endif
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427 #ifndef av_clip_int8
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428 # define av_clip_int8 av_clip_int8_c
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429 #endif
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430 #ifndef av_clip_uint16
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431 # define av_clip_uint16 av_clip_uint16_c
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432 #endif
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433 #ifndef av_clip_int16
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434 # define av_clip_int16 av_clip_int16_c
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435 #endif
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436 #ifndef av_clipl_int32
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437 # define av_clipl_int32 av_clipl_int32_c
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438 #endif
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439 #ifndef av_clip_uintp2
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440 # define av_clip_uintp2 av_clip_uintp2_c
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441 #endif
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442 #ifndef av_sat_add32
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443 # define av_sat_add32 av_sat_add32_c
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444 #endif
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445 #ifndef av_sat_dadd32
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446 # define av_sat_dadd32 av_sat_dadd32_c
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447 #endif
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448 #ifndef av_clipf
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449 # define av_clipf av_clipf_c
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450 #endif
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451 #ifndef av_clipd
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452 # define av_clipd av_clipd_c
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453 #endif
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454 #ifndef av_popcount
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455 # define av_popcount av_popcount_c
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456 #endif
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457 #ifndef av_popcount64
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458 # define av_popcount64 av_popcount64_c
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459 #endif
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