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Diffstat (limited to 'media/ffvpx/libavcodec/rl.h')
| -rw-r--r-- | media/ffvpx/libavcodec/rl.h | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/rl.h b/media/ffvpx/libavcodec/rl.h new file mode 100644 index 0000000000..c45d8659d1 --- /dev/null +++ b/media/ffvpx/libavcodec/rl.h @@ -0,0 +1,112 @@ +/* + * Copyright (c) 2000-2002 Fabrice Bellard + * Copyright (c) 2002-2004 Michael Niedermayer + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * rl header. + */ + +#ifndef AVCODEC_RL_H +#define AVCODEC_RL_H + +#include <stdint.h> + +#include "vlc.h" + +/* run length table */ +#define MAX_RUN 64 +#define MAX_LEVEL 64 + +/** RLTable. */ +typedef struct RLTable { + int n; ///< number of entries of table_vlc minus 1 + int last; ///< number of values for last = 0 + const uint16_t (*table_vlc)[2]; + const int8_t *table_run; + const int8_t *table_level; + uint8_t *index_run[2]; ///< encoding only + int8_t *max_level[2]; ///< encoding & decoding + int8_t *max_run[2]; ///< encoding & decoding + RL_VLC_ELEM *rl_vlc[32]; ///< decoding only +} RLTable; + +/** + * Initialize max_level and index_run from table_run and table_level; + * this is equivalent to initializing RLTable.max_level[0] and + * RLTable.index_run[0] with ff_rl_init(). + */ +void ff_rl_init_level_run(uint8_t max_level[MAX_LEVEL + 1], + uint8_t index_run[MAX_RUN + 1], + const uint8_t table_run[/* n */], + const uint8_t table_level[/* n*/], int n); + +/** + * Initialize index_run, max_level and max_run from n, last, table_vlc, + * table_run and table_level. + * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] + * to hold the level and run tables. + * @note This function does not touch rl_vlc at all, hence there is no need + * to synchronize calls to ff_rl_init() and ff_rl_init_vlc() using the + * same RLTable. + */ +void ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]); + +/** + * Initialize rl_vlc from n, last, table_vlc, table_run and table_level. + * All rl_vlc pointers to be initialized must already point to a static + * buffer of `static_size` RL_VLC_ELEM elements; if a pointer is NULL, + * initializing further VLCs stops. + * @note This function does not touch what ff_rl_init() initializes at all, + * hence there is no need to synchronize calls to ff_rl_init() and + * ff_rl_init_vlc() using the same RLTable. + */ +void ff_rl_init_vlc(RLTable *rl, unsigned static_size); + +#define VLC_INIT_RL(rl, static_size)\ +{\ + static RL_VLC_ELEM rl_vlc_table[32][static_size];\ +\ + for (int q = 0; q < 32; q++) \ + rl.rl_vlc[q] = rl_vlc_table[q]; \ +\ + ff_rl_init_vlc(&rl, static_size); \ +} + +#define INIT_FIRST_VLC_RL(rl, static_size) \ +do { \ + static RL_VLC_ELEM rl_vlc_table[static_size]; \ + \ + rl.rl_vlc[0] = rl_vlc_table; \ + ff_rl_init_vlc(&rl, static_size); \ +} while (0) + +static inline int get_rl_index(const RLTable *rl, int last, int run, int level) +{ + int index; + index = rl->index_run[last][run]; + if (index >= rl->n) + return rl->n; + if (level > rl->max_level[last][run]) + return rl->n; + return index + level - 1; +} + +#endif /* AVCODEC_RL_H */ |