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1 /*
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2 * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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3 * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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4 *
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5 * This file is part of FFmpeg.
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6 *
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7 * FFmpeg is free software; you can redistribute it and/or
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8 * modify it under the terms of the GNU Lesser General Public
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9 * License as published by the Free Software Foundation; either
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10 * version 2.1 of the License, or (at your option) any later version.
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11 *
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12 * FFmpeg is distributed in the hope that it will be useful,
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13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Lesser General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Lesser General Public
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18 * License along with FFmpeg; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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20 */
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21
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22 /**
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23 * @file
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24 * Context Adaptive Binary Arithmetic Coder.
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25 */
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26
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27 #ifndef AVCODEC_CABAC_H
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28 #define AVCODEC_CABAC_H
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29
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30 #include <stdint.h>
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31
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32 #include "put_bits.h"
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33
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34 #if CONFIG_HARDCODED_TABLES
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35 #define CABAC_TABLE_CONST const
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36 #else
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37 #define CABAC_TABLE_CONST
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38 #endif
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39 extern CABAC_TABLE_CONST uint8_t ff_h264_cabac_tables[512 + 4*2*64 + 4*64 + 63];
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40 #define H264_NORM_SHIFT_OFFSET 0
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41 #define H264_LPS_RANGE_OFFSET 512
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42 #define H264_MLPS_STATE_OFFSET 1024
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43 #define H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET 1280
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44
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45 #define CABAC_BITS 16
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46 #define CABAC_MASK ((1<<CABAC_BITS)-1)
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47
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48 typedef struct CABACContext{
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49 int low;
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50 int range;
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51 int outstanding_count;
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52 const uint8_t *bytestream_start;
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53 const uint8_t *bytestream;
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54 const uint8_t *bytestream_end;
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55 PutBitContext pb;
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56 }CABACContext;
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57
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58 void ff_init_cabac_encoder(CABACContext *c, uint8_t *buf, int buf_size);
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59 void ff_init_cabac_decoder(CABACContext *c, const uint8_t *buf, int buf_size);
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60 void ff_init_cabac_states(void);
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61
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62 #endif /* AVCODEC_CABAC_H */
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