00001 /* 00002 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder 00003 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00027 #ifndef AVCODEC_CABAC_H 00028 #define AVCODEC_CABAC_H 00029 00030 #include <stdint.h> 00031 00032 #include "put_bits.h" 00033 00034 #define H264_NORM_SHIFT_OFFSET 0 00035 #define H264_LPS_RANGE_OFFSET 512 00036 #define H264_MLPS_STATE_OFFSET 1024 00037 #define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280 00038 00039 #define CABAC_BITS 16 00040 #define CABAC_MASK ((1<<CABAC_BITS)-1) 00041 00042 typedef struct CABACContext{ 00043 int low; 00044 int range; 00045 int outstanding_count; 00046 const uint8_t *bytestream_start; 00047 const uint8_t *bytestream; 00048 const uint8_t *bytestream_end; 00049 PutBitContext pb; 00050 }CABACContext; 00051 00052 void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size); 00053 void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size); 00054 void ff_init_cabac_states(CABACContext *c); 00055 00056 #endif /* AVCODEC_CABAC_H */
1.5.8