| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder | ||
| 3 | * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * Context Adaptive Binary Arithmetic Coder inline functions | ||
| 25 | */ | ||
| 26 | |||
| 27 | #ifndef AVCODEC_CABAC_FUNCTIONS_H | ||
| 28 | #define AVCODEC_CABAC_FUNCTIONS_H | ||
| 29 | |||
| 30 | #include <stddef.h> | ||
| 31 | #include <stdint.h> | ||
| 32 | |||
| 33 | #include "libavutil/attributes.h" | ||
| 34 | #include "libavutil/intmath.h" | ||
| 35 | #include "cabac.h" | ||
| 36 | #include "config.h" | ||
| 37 | |||
| 38 | #ifndef UNCHECKED_BITSTREAM_READER | ||
| 39 | #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER | ||
| 40 | #endif | ||
| 41 | |||
| 42 | #if ARCH_AARCH64 | ||
| 43 | # include "aarch64/cabac.h" | ||
| 44 | #endif | ||
| 45 | #if ARCH_ARM | ||
| 46 | # include "arm/cabac.h" | ||
| 47 | #endif | ||
| 48 | #if ARCH_X86 | ||
| 49 | # include "x86/cabac.h" | ||
| 50 | #endif | ||
| 51 | #if ARCH_MIPS | ||
| 52 | # include "mips/cabac.h" | ||
| 53 | #endif | ||
| 54 | #if ARCH_LOONGARCH64 | ||
| 55 | # include "loongarch/cabac.h" | ||
| 56 | #endif | ||
| 57 | |||
| 58 | static const uint8_t * const ff_h264_norm_shift = ff_h264_cabac_tables + H264_NORM_SHIFT_OFFSET; | ||
| 59 | static const uint8_t * const ff_h264_lps_range = ff_h264_cabac_tables + H264_LPS_RANGE_OFFSET; | ||
| 60 | static const uint8_t * const ff_h264_mlps_state = ff_h264_cabac_tables + H264_MLPS_STATE_OFFSET; | ||
| 61 | static const uint8_t * const ff_h264_last_coeff_flag_offset_8x8 = ff_h264_cabac_tables + H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET; | ||
| 62 | |||
| 63 | #if !defined(get_cabac_bypass) || !defined(get_cabac_terminate) | ||
| 64 | 24608 | static void refill(CABACContext *c){ | |
| 65 | #if CABAC_BITS == 16 | ||
| 66 | 24608 | c->low+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); | |
| 67 | #else | ||
| 68 | c->low+= c->bytestream[0]<<1; | ||
| 69 | #endif | ||
| 70 | 24608 | c->low -= CABAC_MASK; | |
| 71 | #if !UNCHECKED_BITSTREAM_READER | ||
| 72 |
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22394 | if (c->bytestream < c->bytestream_end) |
| 73 | #endif | ||
| 74 | 24550 | c->bytestream += CABAC_BITS / 8; | |
| 75 | 24608 | } | |
| 76 | #endif | ||
| 77 | |||
| 78 | #ifndef get_cabac_terminate | ||
| 79 | 11591715 | static inline void renorm_cabac_decoder_once(CABACContext *c){ | |
| 80 | 11591715 | int shift= (uint32_t)(c->range - 0x100)>>31; | |
| 81 | 11591715 | c->range<<= shift; | |
| 82 | 11591715 | c->low <<= shift; | |
| 83 |
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11591715 | if(!(c->low & CABAC_MASK)) |
| 84 | 24608 | refill(c); | |
| 85 | 11591715 | } | |
| 86 | #endif | ||
| 87 | |||
| 88 | #ifndef get_cabac_inline | ||
| 89 | static void refill2(CABACContext *c){ | ||
| 90 | int i; | ||
| 91 | unsigned x; | ||
| 92 | #if !HAVE_FAST_CLZ | ||
| 93 | x= c->low ^ (c->low-1); | ||
| 94 | i= 7 - ff_h264_norm_shift[x>>(CABAC_BITS-1)]; | ||
| 95 | #else | ||
| 96 | i = ff_ctz(c->low) - CABAC_BITS; | ||
| 97 | #endif | ||
| 98 | |||
| 99 | x= -CABAC_MASK; | ||
| 100 | |||
| 101 | #if CABAC_BITS == 16 | ||
| 102 | x+= (c->bytestream[0]<<9) + (c->bytestream[1]<<1); | ||
| 103 | #else | ||
| 104 | x+= c->bytestream[0]<<1; | ||
| 105 | #endif | ||
| 106 | |||
| 107 | c->low += x<<i; | ||
| 108 | #if !UNCHECKED_BITSTREAM_READER | ||
| 109 | if (c->bytestream < c->bytestream_end) | ||
| 110 | #endif | ||
| 111 | c->bytestream += CABAC_BITS/8; | ||
| 112 | } | ||
| 113 | #endif | ||
| 114 | |||
| 115 | #ifndef get_cabac_inline | ||
| 116 | static av_always_inline int get_cabac_inline(CABACContext *c, uint8_t * const state){ | ||
| 117 | int s = *state; | ||
| 118 | int RangeLPS= ff_h264_lps_range[2*(c->range&0xC0) + s]; | ||
| 119 | int bit, lps_mask; | ||
| 120 | |||
| 121 | c->range -= RangeLPS; | ||
| 122 | lps_mask= ((c->range<<(CABAC_BITS+1)) - c->low)>>31; | ||
| 123 | |||
| 124 | c->low -= (c->range<<(CABAC_BITS+1)) & lps_mask; | ||
| 125 | c->range += (RangeLPS - c->range) & lps_mask; | ||
| 126 | |||
| 127 | s^=lps_mask; | ||
| 128 | *state= (ff_h264_mlps_state+128)[s]; | ||
| 129 | bit= s&1; | ||
| 130 | |||
| 131 | lps_mask= ff_h264_norm_shift[c->range]; | ||
| 132 | c->range<<= lps_mask; | ||
| 133 | c->low <<= lps_mask; | ||
| 134 | if(!(c->low & CABAC_MASK)) | ||
| 135 | refill2(c); | ||
| 136 | return bit; | ||
| 137 | } | ||
| 138 | #endif | ||
| 139 | |||
| 140 | 90559631 | static int av_noinline av_unused get_cabac_noinline(CABACContext *c, uint8_t * const state){ | |
| 141 | 90559631 | return get_cabac_inline(c,state); | |
| 142 | } | ||
| 143 | |||
| 144 | 1018216102 | static int av_unused get_cabac(CABACContext *c, uint8_t * const state){ | |
| 145 | 1018216102 | return get_cabac_inline(c,state); | |
| 146 | } | ||
| 147 | |||
| 148 | #ifndef get_cabac_bypass | ||
| 149 | static int av_unused get_cabac_bypass(CABACContext *c){ | ||
| 150 | int range; | ||
| 151 | c->low += c->low; | ||
| 152 | |||
| 153 | if(!(c->low & CABAC_MASK)) | ||
| 154 | refill(c); | ||
| 155 | |||
| 156 | range= c->range<<(CABAC_BITS+1); | ||
| 157 | if(c->low < range){ | ||
| 158 | return 0; | ||
| 159 | }else{ | ||
| 160 | c->low -= range; | ||
| 161 | return 1; | ||
| 162 | } | ||
| 163 | } | ||
| 164 | #endif | ||
| 165 | |||
| 166 | #ifndef get_cabac_bypass_sign | ||
| 167 | static av_always_inline int get_cabac_bypass_sign(CABACContext *c, int val){ | ||
| 168 | int range, mask; | ||
| 169 | c->low += c->low; | ||
| 170 | |||
| 171 | if(!(c->low & CABAC_MASK)) | ||
| 172 | refill(c); | ||
| 173 | |||
| 174 | range= c->range<<(CABAC_BITS+1); | ||
| 175 | c->low -= range; | ||
| 176 | mask= c->low >> 31; | ||
| 177 | range &= mask; | ||
| 178 | c->low += range; | ||
| 179 | return (val^mask)-mask; | ||
| 180 | } | ||
| 181 | #endif | ||
| 182 | |||
| 183 | /** | ||
| 184 | * @return the number of bytes read or 0 if no end | ||
| 185 | */ | ||
| 186 | #ifndef get_cabac_terminate | ||
| 187 | 11663121 | static int av_unused get_cabac_terminate(CABACContext *c){ | |
| 188 | 11663121 | c->range -= 2; | |
| 189 |
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11663121 | if(c->low < c->range<<(CABAC_BITS+1)){ |
| 190 | 11591715 | renorm_cabac_decoder_once(c); | |
| 191 | 11591715 | return 0; | |
| 192 | }else{ | ||
| 193 | 71406 | return c->bytestream - c->bytestream_start; | |
| 194 | } | ||
| 195 | } | ||
| 196 | #endif | ||
| 197 | |||
| 198 | /** | ||
| 199 | * Skip @p n bytes and reset the decoder. | ||
| 200 | * @return the address of the first skipped byte or NULL if there's less than @p n bytes left | ||
| 201 | */ | ||
| 202 | #ifndef skip_bytes | ||
| 203 | 20305 | static av_unused const uint8_t* skip_bytes(CABACContext *c, int n) { | |
| 204 | 20305 | const uint8_t *ptr = c->bytestream; | |
| 205 | |||
| 206 |
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20305 | if (c->low & 0x1) |
| 207 | 1126 | ptr--; | |
| 208 | #if CABAC_BITS == 16 | ||
| 209 |
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20305 | if (c->low & 0x1FF) |
| 210 | 10862 | ptr--; | |
| 211 | #endif | ||
| 212 |
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20305 | if ((int) (c->bytestream_end - ptr) < n) |
| 213 | ✗ | return NULL; | |
| 214 |
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20305 | if (ff_init_cabac_decoder(c, ptr + n, c->bytestream_end - ptr - n) < 0) |
| 215 | ✗ | return NULL; | |
| 216 | |||
| 217 | 20305 | return ptr; | |
| 218 | } | ||
| 219 | #endif | ||
| 220 | |||
| 221 | #endif /* AVCODEC_CABAC_FUNCTIONS_H */ | ||
| 222 |