repositories / deb_ffmpeg.git / blame
| Commit | Line | Data |
|---|---|---|
| 2ba45a60 DM |
1 | /* |
| 2 | * Copyright (c) 2000-2002 Fabrice Bellard | |
| 3 | * Copyright (c) 2002-2004 Michael Niedermayer | |
| 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 | * rl header. | |
| 25 | */ | |
| 26 | ||
| 27 | #ifndef AVCODEC_RL_H | |
| 28 | #define AVCODEC_RL_H | |
| 29 | ||
| 30 | #include <stdint.h> | |
| 31 | #include "get_bits.h" | |
| 32 | ||
| 33 | /* run length table */ | |
| 34 | #define MAX_RUN 64 | |
| 35 | #define MAX_LEVEL 64 | |
| 36 | ||
| 37 | /** RLTable. */ | |
| 38 | typedef struct RLTable { | |
| 39 | int n; ///< number of entries of table_vlc minus 1 | |
| 40 | int last; ///< number of values for last = 0 | |
| 41 | const uint16_t (*table_vlc)[2]; | |
| 42 | const int8_t *table_run; | |
| 43 | const int8_t *table_level; | |
| 44 | uint8_t *index_run[2]; ///< encoding only | |
| 45 | int8_t *max_level[2]; ///< encoding & decoding | |
| 46 | int8_t *max_run[2]; ///< encoding & decoding | |
| 47 | RL_VLC_ELEM *rl_vlc[32]; ///< decoding only | |
| 48 | } RLTable; | |
| 49 | ||
| 50 | /** | |
| 51 | * | |
| 52 | * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold | |
| 53 | * the level and run tables, if this is NULL av_malloc() will be used | |
| 54 | */ | |
| 55 | void ff_init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]); | |
| 56 | void ff_init_vlc_rl(RLTable *rl, unsigned static_size); | |
| 57 | ||
| 58 | #define INIT_VLC_RL(rl, static_size)\ | |
| 59 | {\ | |
| 60 | int q;\ | |
| 61 | static RL_VLC_ELEM rl_vlc_table[32][static_size];\ | |
| 62 | \ | |
| 63 | if(!rl.rl_vlc[0]){\ | |
| 64 | for(q=0; q<32; q++)\ | |
| 65 | rl.rl_vlc[q]= rl_vlc_table[q];\ | |
| 66 | \ | |
| 67 | ff_init_vlc_rl(&rl, static_size);\ | |
| 68 | }\ | |
| 69 | } | |
| 70 | ||
| 71 | static inline int get_rl_index(const RLTable *rl, int last, int run, int level) | |
| 72 | { | |
| 73 | int index; | |
| 74 | index = rl->index_run[last][run]; | |
| 75 | if (index >= rl->n) | |
| 76 | return rl->n; | |
| 77 | if (level > rl->max_level[last][run]) | |
| 78 | return rl->n; | |
| 79 | return index + level - 1; | |
| 80 | } | |
| 81 | ||
| 82 | #endif /* AVCODEC_RL_H */ |