| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | |||
| 32 | #include "vlc.h" | ||
| 33 | |||
| 34 | /* run length table */ | ||
| 35 | #define MAX_RUN 64 | ||
| 36 | #define MAX_LEVEL 64 | ||
| 37 | |||
| 38 | /** RLTable. */ | ||
| 39 | typedef struct RLTable { | ||
| 40 | int n; ///< number of entries of table_vlc minus 1 | ||
| 41 | int last; ///< number of values for last = 0 | ||
| 42 | const uint16_t (*table_vlc)[2]; | ||
| 43 | const int8_t *table_run; | ||
| 44 | const int8_t *table_level; | ||
| 45 | uint8_t *index_run[2]; ///< encoding only | ||
| 46 | int8_t *max_level[2]; ///< encoding & decoding | ||
| 47 | int8_t *max_run[2]; ///< encoding & decoding | ||
| 48 | RL_VLC_ELEM *rl_vlc[32]; ///< decoding only | ||
| 49 | } RLTable; | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Initialize max_level and index_run from table_run and table_level; | ||
| 53 | * this is equivalent to initializing RLTable.max_level[0] and | ||
| 54 | * RLTable.index_run[0] with ff_rl_init(). | ||
| 55 | */ | ||
| 56 | void ff_rl_init_level_run(uint8_t max_level[MAX_LEVEL + 1], | ||
| 57 | uint8_t index_run[MAX_RUN + 1], | ||
| 58 | const uint8_t table_run[/* n */], | ||
| 59 | const uint8_t table_level[/* n*/], int n); | ||
| 60 | |||
| 61 | /** | ||
| 62 | * Initialize index_run, max_level and max_run from n, last, table_vlc, | ||
| 63 | * table_run and table_level. | ||
| 64 | * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] | ||
| 65 | * to hold the level and run tables. | ||
| 66 | * @note This function does not touch rl_vlc at all, hence there is no need | ||
| 67 | * to synchronize calls to ff_rl_init() and ff_rl_init_vlc() using the | ||
| 68 | * same RLTable. | ||
| 69 | */ | ||
| 70 | void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]); | ||
| 71 | |||
| 72 | /** | ||
| 73 | * Initialize rl_vlc from n, last, table_vlc, table_run and table_level. | ||
| 74 | * All rl_vlc pointers to be initialized must already point to a static | ||
| 75 | * buffer of `static_size` RL_VLC_ELEM elements; if a pointer is NULL, | ||
| 76 | * initializing further VLCs stops. | ||
| 77 | * @note This function does not touch what ff_rl_init() initializes at all, | ||
| 78 | * hence there is no need to synchronize calls to ff_rl_init() and | ||
| 79 | * ff_rl_init_vlc() using the same RLTable. | ||
| 80 | */ | ||
| 81 | void ff_rl_init_vlc(RLTable *rl, unsigned static_size); | ||
| 82 | |||
| 83 | #define VLC_INIT_RL(rl, static_size)\ | ||
| 84 | {\ | ||
| 85 | static RL_VLC_ELEM rl_vlc_table[32][static_size];\ | ||
| 86 | \ | ||
| 87 | for (int q = 0; q < 32; q++) \ | ||
| 88 | rl.rl_vlc[q] = rl_vlc_table[q]; \ | ||
| 89 | \ | ||
| 90 | ff_rl_init_vlc(&rl, static_size); \ | ||
| 91 | } | ||
| 92 | |||
| 93 | #define INIT_FIRST_VLC_RL(rl, static_size) \ | ||
| 94 | do { \ | ||
| 95 | static RL_VLC_ELEM rl_vlc_table[static_size]; \ | ||
| 96 | \ | ||
| 97 | rl.rl_vlc[0] = rl_vlc_table; \ | ||
| 98 | ff_rl_init_vlc(&rl, static_size); \ | ||
| 99 | } while (0) | ||
| 100 | |||
| 101 | 38556146 | static inline int get_rl_index(const RLTable *rl, int last, int run, int level) | |
| 102 | { | ||
| 103 | int index; | ||
| 104 | 38556146 | index = rl->index_run[last][run]; | |
| 105 |
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38556146 | if (index >= rl->n) |
| 106 | 7313667 | return rl->n; | |
| 107 |
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31242479 | if (level > rl->max_level[last][run]) |
| 108 | 5946780 | return rl->n; | |
| 109 | 25295699 | return index + level - 1; | |
| 110 | } | ||
| 111 | |||
| 112 | #endif /* AVCODEC_RL_H */ | ||
| 113 |