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  1. /*
  2.  * Header file for hardcoded DV tables
  3.  *
  4.  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_DV_TABLEGEN_H
  24. #define AVCODEC_DV_TABLEGEN_H
  25.  
  26. #include <stdint.h>
  27. #include "libavutil/attributes.h"
  28.  
  29. #include "dvdata.h"
  30.  
  31. #if CONFIG_SMALL
  32. #define DV_VLC_MAP_RUN_SIZE  15
  33. #define DV_VLC_MAP_LEV_SIZE  23
  34. #else
  35. #define DV_VLC_MAP_RUN_SIZE  64
  36. #define DV_VLC_MAP_LEV_SIZE 512 // FIXME sign was removed so this should be /2 but needs check
  37. #endif
  38.  
  39. /* VLC encoding lookup table */
  40. typedef struct dv_vlc_pair {
  41.     uint32_t vlc;
  42.     uint32_t size;
  43. } dv_vlc_pair;
  44.  
  45. #if CONFIG_HARDCODED_TABLES
  46. #define dv_vlc_map_tableinit()
  47. #include "libavcodec/dv_tables.h"
  48. #else
  49. static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
  50.  
  51. static av_cold void dv_vlc_map_tableinit(void)
  52. {
  53.     int i, j;
  54.     for (i = 0; i < NB_DV_VLC - 1; i++) {
  55.         if (ff_dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
  56.             continue;
  57. #if CONFIG_SMALL
  58.         if (ff_dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
  59.             continue;
  60. #endif
  61.  
  62.         if (dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size != 0)
  63.             continue;
  64.  
  65.         dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].vlc  =
  66.             ff_dv_vlc_bits[i] << (!!ff_dv_vlc_level[i]);
  67.         dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size =
  68.             ff_dv_vlc_len[i]   + (!!ff_dv_vlc_level[i]);
  69.     }
  70.     for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
  71. #if CONFIG_SMALL
  72.         for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
  73.             if (dv_vlc_map[i][j].size == 0) {
  74.                 dv_vlc_map[i][j].vlc  = dv_vlc_map[0][j].vlc |
  75.                                         (dv_vlc_map[i - 1][0].vlc <<
  76.                                          dv_vlc_map[0][j].size);
  77.                 dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
  78.                                         dv_vlc_map[0][j].size;
  79.             }
  80.         }
  81. #else
  82.         for (j = 1; j < DV_VLC_MAP_LEV_SIZE / 2; j++) {
  83.             if (dv_vlc_map[i][j].size == 0) {
  84.                 dv_vlc_map[i][j].vlc  = dv_vlc_map[0][j].vlc |
  85.                                         (dv_vlc_map[i - 1][0].vlc <<
  86.                                          dv_vlc_map[0][j].size);
  87.                 dv_vlc_map[i][j].size = dv_vlc_map[i - 1][0].size +
  88.                                         dv_vlc_map[0][j].size;
  89.             }
  90.             dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].vlc  = dv_vlc_map[i][j].vlc | 1;
  91.             dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].size = dv_vlc_map[i][j].size;
  92.         }
  93. #endif
  94.     }
  95. }
  96. #endif /* CONFIG_HARDCODED_TABLES */
  97.  
  98. #endif /* AVCODEC_DV_TABLEGEN_H */
  99.