libavcodec/dv_tablegen.h

   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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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
  28 #include "dv_vlc_data.h"
  29
  30 #if CONFIG_SMALL
  31 #define DV_VLC_MAP_RUN_SIZE 15
  32 #define DV_VLC_MAP_LEV_SIZE 23
  33 #else
  34 #define DV_VLC_MAP_RUN_SIZE  64
  35 #define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
  36 #endif
  37
  38 /* VLC encoding lookup table */
  39 typedef struct dv_vlc_pair {
  40    uint32_t vlc;
  41    uint32_t size;
  42 } dv_vlc_pair;
  43
  44 #if CONFIG_HARDCODED_TABLES
  45 #define dv_vlc_map_tableinit()
  46 #include "libavcodec/dv_tables.h"
  47 #else
  48 static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
  49
  50 static void dv_vlc_map_tableinit(void)
  51 {
  52     int i, j;
  53     for (i = 0; i < NB_DV_VLC - 1; i++) {
  54        if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
  55            continue;
  56 #if CONFIG_SMALL
  57        if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
  58            continue;
  59 #endif
  60
  61        if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
  62            continue;
  63
  64        dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc  =
  65            dv_vlc_bits[i] << (!!dv_vlc_level[i]);
  66        dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size =
  67            dv_vlc_len[i] + (!!dv_vlc_level[i]);
  68     }
  69     for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
  70 #if CONFIG_SMALL
  71        for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
  72           if (dv_vlc_map[i][j].size == 0) {
  73               dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
  74                         (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
  75               dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
  76                                       dv_vlc_map[0][j].size;
  77           }
  78        }
  79 #else
  80        for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
  81           if (dv_vlc_map[i][j].size == 0) {
  82               dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
  83                         (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
  84               dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
  85                                       dv_vlc_map[0][j].size;
  86           }
  87           dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
  88                                         dv_vlc_map[i][j].vlc | 1;
  89           dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
  90                                         dv_vlc_map[i][j].size;
  91        }
  92 #endif
  93     }
  94 }
  95 #endif /* CONFIG_HARDCODED_TABLES */
  96
  97 #endif /* AVCODEC_DV_TABLEGEN_H */