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ffmpeg / libavcodec / dv_tablegen.h @ 2912e87a

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/*
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 * Header file for hardcoded DV tables
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 *
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 * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef DV_TABLEGEN_H
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#define DV_TABLEGEN_H
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#include <stdint.h>
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#include "dv_vlc_data.h"
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#if CONFIG_SMALL
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#define DV_VLC_MAP_RUN_SIZE 15
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#define DV_VLC_MAP_LEV_SIZE 23
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#else
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#define DV_VLC_MAP_RUN_SIZE  64
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#define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
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#endif
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/* VLC encoding lookup table */
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typedef struct dv_vlc_pair {
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   uint32_t vlc;
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   uint32_t size;
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} dv_vlc_pair;
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#if CONFIG_HARDCODED_TABLES
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#define dv_vlc_map_tableinit()
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#include "libavcodec/dv_tables.h"
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#else
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static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
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static void dv_vlc_map_tableinit(void)
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{
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    int i, j;
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    for (i = 0; i < NB_DV_VLC - 1; i++) {
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       if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
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           continue;
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#if CONFIG_SMALL
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       if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
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           continue;
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#endif
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       if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
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           continue;
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       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc  =
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           dv_vlc_bits[i] << (!!dv_vlc_level[i]);
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       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size =
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           dv_vlc_len[i] + (!!dv_vlc_level[i]);
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    }
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    for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
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#if CONFIG_SMALL
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       for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
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          if (dv_vlc_map[i][j].size == 0) {
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              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
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                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
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              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
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                                      dv_vlc_map[0][j].size;
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          }
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       }
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#else
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       for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
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          if (dv_vlc_map[i][j].size == 0) {
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              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
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                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
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              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
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                                      dv_vlc_map[0][j].size;
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          }
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          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
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                                        dv_vlc_map[i][j].vlc | 1;
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          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
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                                        dv_vlc_map[i][j].size;
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       }
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#endif
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    }
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}
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#endif /* CONFIG_HARDCODED_TABLES */
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#endif /* DV_TABLEGEN_H */