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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.     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. int ff_rl_init(RLTable *rl, uint8_t static_store[2][2*MAX_RUN + MAX_LEVEL + 3]);
  56. void ff_rl_init_vlc(RLTable *rl, unsigned static_size);
  57.  
  58. /**
  59.  * Free the contents of a dynamically allocated table.
  60.  */
  61. void ff_rl_free(RLTable *rl);
  62.  
  63. #define INIT_VLC_RL(rl, static_size)\
  64. {\
  65.     int q;\
  66.     static RL_VLC_ELEM rl_vlc_table[32][static_size];\
  67. \
  68.     if(!rl.rl_vlc[0]){\
  69.         for(q=0; q<32; q++)\
  70.             rl.rl_vlc[q]= rl_vlc_table[q];\
  71. \
  72.         ff_rl_init_vlc(&rl, static_size);\
  73.     }\
  74. }
  75.  
  76. static inline int get_rl_index(const RLTable *rl, int last, int run, int level)
  77. {
  78.     int index;
  79.     index = rl->index_run[last][run];
  80.     if (index >= rl->n)
  81.         return rl->n;
  82.     if (level > rl->max_level[last][run])
  83.         return rl->n;
  84.     return index + level - 1;
  85. }
  86.  
  87. #endif /* AVCODEC_RL_H */
  88.