blob: daa5a6176b31e7f6d3c2605eae05c9547608f226
| 1 | /* |
| 2 | * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> |
| 3 | * |
| 4 | * This file is part of FFmpeg. |
| 5 | * |
| 6 | * FFmpeg is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * FFmpeg is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with FFmpeg; if not, write to the Free Software |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 19 | */ |
| 20 | |
| 21 | /** |
| 22 | * @file libavutil/internal.h |
| 23 | * common internal API header |
| 24 | */ |
| 25 | |
| 26 | #ifndef AVUTIL_INTERNAL_H |
| 27 | #define AVUTIL_INTERNAL_H |
| 28 | |
| 29 | #if !defined(DEBUG) && !defined(NDEBUG) |
| 30 | # define NDEBUG |
| 31 | #endif |
| 32 | |
| 33 | #include <limits.h> |
| 34 | #include "common.h" |
| 35 | |
| 36 | #ifndef attribute_align_arg |
| 37 | #if (!defined(__ICC) || __ICC > 1110) && AV_GCC_VERSION_AT_LEAST(4,2) |
| 38 | # define attribute_align_arg __attribute__((force_align_arg_pointer)) |
| 39 | #else |
| 40 | # define attribute_align_arg |
| 41 | #endif |
| 42 | #endif |
| 43 | |
| 44 | #ifndef attribute_used |
| 45 | #if AV_GCC_VERSION_AT_LEAST(3,1) |
| 46 | # define attribute_used __attribute__((used)) |
| 47 | #else |
| 48 | # define attribute_used |
| 49 | #endif |
| 50 | #endif |
| 51 | |
| 52 | #ifndef INT16_MIN |
| 53 | #define INT16_MIN (-0x7fff - 1) |
| 54 | #endif |
| 55 | |
| 56 | #ifndef INT16_MAX |
| 57 | #define INT16_MAX 0x7fff |
| 58 | #endif |
| 59 | |
| 60 | #ifndef INT32_MIN |
| 61 | #define INT32_MIN (-0x7fffffff - 1) |
| 62 | #endif |
| 63 | |
| 64 | #ifndef INT32_MAX |
| 65 | #define INT32_MAX 0x7fffffff |
| 66 | #endif |
| 67 | |
| 68 | #ifndef UINT32_MAX |
| 69 | #define UINT32_MAX 0xffffffff |
| 70 | #endif |
| 71 | |
| 72 | #ifndef INT64_MIN |
| 73 | #define INT64_MIN (-0x7fffffffffffffffLL - 1) |
| 74 | #endif |
| 75 | |
| 76 | #ifndef INT64_MAX |
| 77 | #define INT64_MAX INT64_C(9223372036854775807) |
| 78 | #endif |
| 79 | |
| 80 | #ifndef UINT64_MAX |
| 81 | #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF) |
| 82 | #endif |
| 83 | |
| 84 | #ifndef INT_BIT |
| 85 | # define INT_BIT (CHAR_BIT * sizeof(int)) |
| 86 | #endif |
| 87 | |
| 88 | #ifndef offsetof |
| 89 | # define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F)) |
| 90 | #endif |
| 91 | |
| 92 | /* Use to export labels from asm. */ |
| 93 | #define LABEL_MANGLE(a) EXTERN_PREFIX #a |
| 94 | |
| 95 | // Use rip-relative addressing if compiling PIC code on x86-64. |
| 96 | #if ARCH_X86_64 && defined(PIC) |
| 97 | # define LOCAL_MANGLE(a) #a "(%%rip)" |
| 98 | #else |
| 99 | # define LOCAL_MANGLE(a) #a |
| 100 | #endif |
| 101 | |
| 102 | #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a) |
| 103 | |
| 104 | /* math */ |
| 105 | |
| 106 | extern const uint32_t ff_inverse[257]; |
| 107 | |
| 108 | #if CONFIG_FASTDIV |
| 109 | #define FASTDIV(a,b) ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32)) |
| 110 | #else |
| 111 | #define FASTDIV(a,b) ((a) / (b)) |
| 112 | #endif |
| 113 | |
| 114 | extern const uint8_t ff_sqrt_tab[256]; |
| 115 | |
| 116 | static inline av_const unsigned int ff_sqrt(unsigned int a) |
| 117 | { |
| 118 | unsigned int b; |
| 119 | |
| 120 | if (a < 255) { |
| 121 | return (ff_sqrt_tab[a + 1] - 1) >> 4; |
| 122 | } else if (a < (1 << 12)) { |
| 123 | b = ff_sqrt_tab[a >> 4] >> 2; |
| 124 | } |
| 125 | #if !CONFIG_SMALL |
| 126 | else if (a < (1 << 14)) { |
| 127 | b = ff_sqrt_tab[a >> 6] >> 1; |
| 128 | } else if (a < (1 << 16)) { |
| 129 | b = ff_sqrt_tab[a >> 8] ; |
| 130 | } |
| 131 | #endif |
| 132 | else { |
| 133 | int s = av_log2_16bit(a >> 16) >> 1; |
| 134 | unsigned int c = a >> (s + 2); |
| 135 | b = ff_sqrt_tab[c >> (s + 8)]; |
| 136 | b = FASTDIV(c, b) + (b << s); |
| 137 | } |
| 138 | |
| 139 | return b - (a < b * b); |
| 140 | } |
| 141 | |
| 142 | #if ARCH_X86 |
| 143 | #define MASK_ABS(mask, level)\ |
| 144 | __asm__ volatile(\ |
| 145 | "cltd \n\t"\ |
| 146 | "xorl %1, %0 \n\t"\ |
| 147 | "subl %1, %0 \n\t"\ |
| 148 | : "+a" (level), "=&d" (mask)\ |
| 149 | ); |
| 150 | #else |
| 151 | #define MASK_ABS(mask, level)\ |
| 152 | mask = level >> 31;\ |
| 153 | level = (level ^ mask) - mask; |
| 154 | #endif |
| 155 | |
| 156 | #if HAVE_CMOV |
| 157 | #define COPY3_IF_LT(x, y, a, b, c, d)\ |
| 158 | __asm__ volatile(\ |
| 159 | "cmpl %0, %3 \n\t"\ |
| 160 | "cmovl %3, %0 \n\t"\ |
| 161 | "cmovl %4, %1 \n\t"\ |
| 162 | "cmovl %5, %2 \n\t"\ |
| 163 | : "+&r" (x), "+&r" (a), "+r" (c)\ |
| 164 | : "r" (y), "r" (b), "r" (d)\ |
| 165 | ); |
| 166 | #else |
| 167 | #define COPY3_IF_LT(x, y, a, b, c, d)\ |
| 168 | if ((y) < (x)) {\ |
| 169 | (x) = (y);\ |
| 170 | (a) = (b);\ |
| 171 | (c) = (d);\ |
| 172 | } |
| 173 | #endif |
| 174 | |
| 175 | #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\ |
| 176 | {\ |
| 177 | p = av_malloc(size);\ |
| 178 | if (p == NULL && (size) != 0) {\ |
| 179 | av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| 180 | goto label;\ |
| 181 | }\ |
| 182 | } |
| 183 | |
| 184 | #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\ |
| 185 | {\ |
| 186 | p = av_mallocz(size);\ |
| 187 | if (p == NULL && (size) != 0) {\ |
| 188 | av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\ |
| 189 | goto label;\ |
| 190 | }\ |
| 191 | } |
| 192 | |
| 193 | #define NULL_IF_CONFIG_SMALL(x) x |
| 194 | |
| 195 | #endif /* AVUTIL_INTERNAL_H */ |
| 196 |