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  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.     VLC vlc;                       ///< decoding only deprecated FIXME remove
  48.     RL_VLC_ELEM *rl_vlc[32];       ///< decoding only
  49. } RLTable;
  50.  
  51. /**
  52.  *
  53.  * @param static_store static uint8_t array[2][2*MAX_RUN + MAX_LEVEL + 3] which will hold
  54.  *                     the level and run tables, if this is NULL av_malloc() will be used
  55.  */
  56. void ff_init_rl(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
  57. void ff_init_vlc_rl(RLTable *rl);
  58.  
  59. #define INIT_VLC_RL(rl, static_size)\
  60. {\
  61.     int q;\
  62.     static RL_VLC_ELEM rl_vlc_table[32][static_size];\
  63.     INIT_VLC_STATIC(&rl.vlc, 9, rl.n + 1,\
  64.              &rl.table_vlc[0][1], 4, 2,\
  65.              &rl.table_vlc[0][0], 4, 2, static_size);\
  66. \
  67.     if(!rl.rl_vlc[0]){\
  68.         for(q=0; q<32; q++)\
  69.             rl.rl_vlc[q]= rl_vlc_table[q];\
  70. \
  71.         ff_init_vlc_rl(&rl);\
  72.     }\
  73. }
  74.  
  75. static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
  76. {
  77.     int index;
  78.     index = rl->index_run[last][run];
  79.     if (index >= rl->n)
  80.         return rl->n;
  81.     if (level > rl->max_level[last][run])
  82.         return rl->n;
  83.     return index + level - 1;
  84. }
  85.  
  86. #endif /* AVCODEC_RL_H */
  87.