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. 25 */ 26 27 #ifndef AVCODEC_CABAC_H 28 #define AVCODEC_CABAC_H 29 30 #include <stdint.h> 31 32 extern const uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63]; 33 #define H264_NORM_SHIFT_OFFSET 0 34 #define H264_LPS_RANGE_OFFSET 512 35 #define H264_MLPS_STATE_OFFSET 1024 36 #define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280 37 38 #define CABAC_BITS 16 39 #define CABAC_MASK ((1<<CABAC_BITS)-1) 40 41 typedef struct CABACContext{ 42 int low; 43 int range; 44 const uint8_t *bytestream_start; 45 const uint8_t *bytestream; 46 const uint8_t *bytestream_end; 47 }CABACContext; 48 49 int ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size); 50 51 #endif /* AVCODEC_CABAC_H */ 52