1cabdff1aSopenharmony_ci/* 2cabdff1aSopenharmony_ci * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder 3cabdff1aSopenharmony_ci * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 4cabdff1aSopenharmony_ci * 5cabdff1aSopenharmony_ci * This file is part of FFmpeg. 6cabdff1aSopenharmony_ci * 7cabdff1aSopenharmony_ci * FFmpeg is free software; you can redistribute it and/or 8cabdff1aSopenharmony_ci * modify it under the terms of the GNU Lesser General Public 9cabdff1aSopenharmony_ci * License as published by the Free Software Foundation; either 10cabdff1aSopenharmony_ci * version 2.1 of the License, or (at your option) any later version. 11cabdff1aSopenharmony_ci * 12cabdff1aSopenharmony_ci * FFmpeg is distributed in the hope that it will be useful, 13cabdff1aSopenharmony_ci * but WITHOUT ANY WARRANTY; without even the implied warranty of 14cabdff1aSopenharmony_ci * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15cabdff1aSopenharmony_ci * Lesser General Public License for more details. 16cabdff1aSopenharmony_ci * 17cabdff1aSopenharmony_ci * You should have received a copy of the GNU Lesser General Public 18cabdff1aSopenharmony_ci * License along with FFmpeg; if not, write to the Free Software 19cabdff1aSopenharmony_ci * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20cabdff1aSopenharmony_ci */ 21cabdff1aSopenharmony_ci 22cabdff1aSopenharmony_ci/** 23cabdff1aSopenharmony_ci * @file 24cabdff1aSopenharmony_ci * Context Adaptive Binary Arithmetic Coder. 25cabdff1aSopenharmony_ci */ 26cabdff1aSopenharmony_ci 27cabdff1aSopenharmony_ci#include "libavutil/error.h" 28cabdff1aSopenharmony_ci#include "libavutil/mem_internal.h" 29cabdff1aSopenharmony_ci 30cabdff1aSopenharmony_ci#include "cabac.h" 31cabdff1aSopenharmony_ci 32cabdff1aSopenharmony_ciDECLARE_ASM_ALIGNED(1, const uint8_t, ff_h264_cabac_tables)[512 + 4*2*64 + 4*64 + 63] = { 33cabdff1aSopenharmony_ci 9,8,7,7,6,6,6,6,5,5,5,5,5,5,5,5, 34cabdff1aSopenharmony_ci 4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4, 35cabdff1aSopenharmony_ci 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 36cabdff1aSopenharmony_ci 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3, 37cabdff1aSopenharmony_ci 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 38cabdff1aSopenharmony_ci 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 39cabdff1aSopenharmony_ci 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 40cabdff1aSopenharmony_ci 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 41cabdff1aSopenharmony_ci 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 42cabdff1aSopenharmony_ci 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 43cabdff1aSopenharmony_ci 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 44cabdff1aSopenharmony_ci 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 45cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 46cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 47cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 48cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 49cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 50cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 51cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 52cabdff1aSopenharmony_ci 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 53cabdff1aSopenharmony_ci // LPS range 54cabdff1aSopenharmony_ci -128, -128, -128, -128, -128, -128, 123, 123, 55cabdff1aSopenharmony_ci 116, 116, 111, 111, 105, 105, 100, 100, 56cabdff1aSopenharmony_ci 95, 95, 90, 90, 85, 85, 81, 81, 57cabdff1aSopenharmony_ci 77, 77, 73, 73, 69, 69, 66, 66, 58cabdff1aSopenharmony_ci 62, 62, 59, 59, 56, 56, 53, 53, 59cabdff1aSopenharmony_ci 51, 51, 48, 48, 46, 46, 43, 43, 60cabdff1aSopenharmony_ci 41, 41, 39, 39, 37, 37, 35, 35, 61cabdff1aSopenharmony_ci 33, 33, 32, 32, 30, 30, 29, 29, 62cabdff1aSopenharmony_ci 27, 27, 26, 26, 24, 24, 23, 23, 63cabdff1aSopenharmony_ci 22, 22, 21, 21, 20, 20, 19, 19, 64cabdff1aSopenharmony_ci 18, 18, 17, 17, 16, 16, 15, 15, 65cabdff1aSopenharmony_ci 14, 14, 14, 14, 13, 13, 12, 12, 66cabdff1aSopenharmony_ci 12, 12, 11, 11, 11, 11, 10, 10, 67cabdff1aSopenharmony_ci 10, 10, 9, 9, 9, 9, 8, 8, 68cabdff1aSopenharmony_ci 8, 8, 7, 7, 7, 7, 7, 7, 69cabdff1aSopenharmony_ci 6, 6, 6, 6, 6, 6, 2, 2, 70cabdff1aSopenharmony_ci -80, -80, -89, -89, -98, -98, -106, -106, 71cabdff1aSopenharmony_ci -114, -114, -121, -121, -128, -128, 122, 122, 72cabdff1aSopenharmony_ci 116, 116, 110, 110, 104, 104, 99, 99, 73cabdff1aSopenharmony_ci 94, 94, 89, 89, 85, 85, 80, 80, 74cabdff1aSopenharmony_ci 76, 76, 72, 72, 69, 69, 65, 65, 75cabdff1aSopenharmony_ci 62, 62, 59, 59, 56, 56, 53, 53, 76cabdff1aSopenharmony_ci 50, 50, 48, 48, 45, 45, 43, 43, 77cabdff1aSopenharmony_ci 41, 41, 39, 39, 37, 37, 35, 35, 78cabdff1aSopenharmony_ci 33, 33, 31, 31, 30, 30, 28, 28, 79cabdff1aSopenharmony_ci 27, 27, 26, 26, 24, 24, 23, 23, 80cabdff1aSopenharmony_ci 22, 22, 21, 21, 20, 20, 19, 19, 81cabdff1aSopenharmony_ci 18, 18, 17, 17, 16, 16, 15, 15, 82cabdff1aSopenharmony_ci 14, 14, 14, 14, 13, 13, 12, 12, 83cabdff1aSopenharmony_ci 12, 12, 11, 11, 11, 11, 10, 10, 84cabdff1aSopenharmony_ci 9, 9, 9, 9, 9, 9, 8, 8, 85cabdff1aSopenharmony_ci 8, 8, 7, 7, 7, 7, 2, 2, 86cabdff1aSopenharmony_ci -48, -48, -59, -59, -69, -69, -78, -78, 87cabdff1aSopenharmony_ci -87, -87, -96, -96, -104, -104, -112, -112, 88cabdff1aSopenharmony_ci -119, -119, -126, -126, 123, 123, 117, 117, 89cabdff1aSopenharmony_ci 111, 111, 105, 105, 100, 100, 95, 95, 90cabdff1aSopenharmony_ci 90, 90, 86, 86, 81, 81, 77, 77, 91cabdff1aSopenharmony_ci 73, 73, 69, 69, 66, 66, 63, 63, 92cabdff1aSopenharmony_ci 59, 59, 56, 56, 54, 54, 51, 51, 93cabdff1aSopenharmony_ci 48, 48, 46, 46, 43, 43, 41, 41, 94cabdff1aSopenharmony_ci 39, 39, 37, 37, 35, 35, 33, 33, 95cabdff1aSopenharmony_ci 32, 32, 30, 30, 29, 29, 27, 27, 96cabdff1aSopenharmony_ci 26, 26, 25, 25, 23, 23, 22, 22, 97cabdff1aSopenharmony_ci 21, 21, 20, 20, 19, 19, 18, 18, 98cabdff1aSopenharmony_ci 17, 17, 16, 16, 15, 15, 15, 15, 99cabdff1aSopenharmony_ci 14, 14, 13, 13, 12, 12, 12, 12, 100cabdff1aSopenharmony_ci 11, 11, 11, 11, 10, 10, 10, 10, 101cabdff1aSopenharmony_ci 9, 9, 9, 9, 8, 8, 2, 2, 102cabdff1aSopenharmony_ci -16, -16, -29, -29, -40, -40, -51, -51, 103cabdff1aSopenharmony_ci -61, -61, -71, -71, -81, -81, -90, -90, 104cabdff1aSopenharmony_ci -98, -98, -106, -106, -114, -114, -121, -121, 105cabdff1aSopenharmony_ci -128, -128, 122, 122, 116, 116, 110, 110, 106cabdff1aSopenharmony_ci 104, 104, 99, 99, 94, 94, 89, 89, 107cabdff1aSopenharmony_ci 85, 85, 80, 80, 76, 76, 72, 72, 108cabdff1aSopenharmony_ci 69, 69, 65, 65, 62, 62, 59, 59, 109cabdff1aSopenharmony_ci 56, 56, 53, 53, 50, 50, 48, 48, 110cabdff1aSopenharmony_ci 45, 45, 43, 43, 41, 41, 39, 39, 111cabdff1aSopenharmony_ci 37, 37, 35, 35, 33, 33, 31, 31, 112cabdff1aSopenharmony_ci 30, 30, 28, 28, 27, 27, 25, 25, 113cabdff1aSopenharmony_ci 24, 24, 23, 23, 22, 22, 21, 21, 114cabdff1aSopenharmony_ci 20, 20, 19, 19, 18, 18, 17, 17, 115cabdff1aSopenharmony_ci 16, 16, 15, 15, 14, 14, 14, 14, 116cabdff1aSopenharmony_ci 13, 13, 12, 12, 12, 12, 11, 11, 117cabdff1aSopenharmony_ci 11, 11, 10, 10, 9, 9, 2, 2, 118cabdff1aSopenharmony_ci // mlps state 119cabdff1aSopenharmony_ci 127, 126, 77, 76, 77, 76, 75, 74, 120cabdff1aSopenharmony_ci 75, 74, 75, 74, 73, 72, 73, 72, 121cabdff1aSopenharmony_ci 73, 72, 71, 70, 71, 70, 71, 70, 122cabdff1aSopenharmony_ci 69, 68, 69, 68, 67, 66, 67, 66, 123cabdff1aSopenharmony_ci 67, 66, 65, 64, 65, 64, 63, 62, 124cabdff1aSopenharmony_ci 61, 60, 61, 60, 61, 60, 59, 58, 125cabdff1aSopenharmony_ci 59, 58, 57, 56, 55, 54, 55, 54, 126cabdff1aSopenharmony_ci 53, 52, 53, 52, 51, 50, 49, 48, 127cabdff1aSopenharmony_ci 49, 48, 47, 46, 45, 44, 45, 44, 128cabdff1aSopenharmony_ci 43, 42, 43, 42, 39, 38, 39, 38, 129cabdff1aSopenharmony_ci 37, 36, 37, 36, 33, 32, 33, 32, 130cabdff1aSopenharmony_ci 31, 30, 31, 30, 27, 26, 27, 26, 131cabdff1aSopenharmony_ci 25, 24, 23, 22, 23, 22, 19, 18, 132cabdff1aSopenharmony_ci 19, 18, 17, 16, 15, 14, 13, 12, 133cabdff1aSopenharmony_ci 11, 10, 9, 8, 9, 8, 5, 4, 134cabdff1aSopenharmony_ci 5, 4, 3, 2, 1, 0, 0, 1, 135cabdff1aSopenharmony_ci 2, 3, 4, 5, 6, 7, 8, 9, 136cabdff1aSopenharmony_ci 10, 11, 12, 13, 14, 15, 16, 17, 137cabdff1aSopenharmony_ci 18, 19, 20, 21, 22, 23, 24, 25, 138cabdff1aSopenharmony_ci 26, 27, 28, 29, 30, 31, 32, 33, 139cabdff1aSopenharmony_ci 34, 35, 36, 37, 38, 39, 40, 41, 140cabdff1aSopenharmony_ci 42, 43, 44, 45, 46, 47, 48, 49, 141cabdff1aSopenharmony_ci 50, 51, 52, 53, 54, 55, 56, 57, 142cabdff1aSopenharmony_ci 58, 59, 60, 61, 62, 63, 64, 65, 143cabdff1aSopenharmony_ci 66, 67, 68, 69, 70, 71, 72, 73, 144cabdff1aSopenharmony_ci 74, 75, 76, 77, 78, 79, 80, 81, 145cabdff1aSopenharmony_ci 82, 83, 84, 85, 86, 87, 88, 89, 146cabdff1aSopenharmony_ci 90, 91, 92, 93, 94, 95, 96, 97, 147cabdff1aSopenharmony_ci 98, 99, 100, 101, 102, 103, 104, 105, 148cabdff1aSopenharmony_ci 106, 107, 108, 109, 110, 111, 112, 113, 149cabdff1aSopenharmony_ci 114, 115, 116, 117, 118, 119, 120, 121, 150cabdff1aSopenharmony_ci 122, 123, 124, 125, 124, 125, 126, 127, 151cabdff1aSopenharmony_ci // last_coeff_flag_offset_8x8 152cabdff1aSopenharmony_ci 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 153cabdff1aSopenharmony_ci 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 154cabdff1aSopenharmony_ci 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 155cabdff1aSopenharmony_ci 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8 156cabdff1aSopenharmony_ci}; 157cabdff1aSopenharmony_ci 158cabdff1aSopenharmony_ci/** 159cabdff1aSopenharmony_ci * 160cabdff1aSopenharmony_ci * @param buf_size size of buf in bits 161cabdff1aSopenharmony_ci */ 162cabdff1aSopenharmony_ciint ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size){ 163cabdff1aSopenharmony_ci c->bytestream_start= 164cabdff1aSopenharmony_ci c->bytestream= buf; 165cabdff1aSopenharmony_ci c->bytestream_end= buf + buf_size; 166cabdff1aSopenharmony_ci 167cabdff1aSopenharmony_ci#if CABAC_BITS == 16 168cabdff1aSopenharmony_ci c->low = (*c->bytestream++)<<18; 169cabdff1aSopenharmony_ci c->low+= (*c->bytestream++)<<10; 170cabdff1aSopenharmony_ci // Keep our fetches on a 2-byte boundary as this should avoid ever having to 171cabdff1aSopenharmony_ci // do unaligned loads if the compiler (or asm) optimises the double byte 172cabdff1aSopenharmony_ci // load into a single instruction 173cabdff1aSopenharmony_ci if(((uintptr_t)c->bytestream & 1) == 0) { 174cabdff1aSopenharmony_ci c->low += (1 << 9); 175cabdff1aSopenharmony_ci } 176cabdff1aSopenharmony_ci else { 177cabdff1aSopenharmony_ci c->low += ((*c->bytestream++) << 2) + 2; 178cabdff1aSopenharmony_ci } 179cabdff1aSopenharmony_ci#else 180cabdff1aSopenharmony_ci c->low = (*c->bytestream++)<<10; 181cabdff1aSopenharmony_ci c->low+= ((*c->bytestream++)<<2) + 2; 182cabdff1aSopenharmony_ci#endif 183cabdff1aSopenharmony_ci c->range= 0x1FE; 184cabdff1aSopenharmony_ci if ((c->range<<(CABAC_BITS+1)) < c->low) 185cabdff1aSopenharmony_ci return AVERROR_INVALIDDATA; 186cabdff1aSopenharmony_ci return 0; 187cabdff1aSopenharmony_ci} 188