annotate ffmpeg/libavcodec/dv_tablegen.h @ 13:844d341cf643 tip

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/*
 * Header file for hardcoded DV tables
 *
 * Copyright (c) 2010 Reimar Döffinger <[e-mail]>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_DV_TABLEGEN_H
#define AVCODEC_DV_TABLEGEN_H

#include <stdint.h>

#include "dv_vlc_data.h"

#if CONFIG_SMALL
#define DV_VLC_MAP_RUN_SIZE 15
#define DV_VLC_MAP_LEV_SIZE 23
#else
#define DV_VLC_MAP_RUN_SIZE  64
#define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
#endif

/* VLC encoding lookup table */
typedef struct dv_vlc_pair {
   uint32_t vlc;
   uint32_t size;
} dv_vlc_pair;

#if CONFIG_HARDCODED_TABLES
#define dv_vlc_map_tableinit()
#include "libavcodec/dv_tables.h"
#else
static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];

static void dv_vlc_map_tableinit(void)
{
    int i, j;
    for (i = 0; i < NB_DV_VLC - 1; i++) {
       if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
           continue;
#if CONFIG_SMALL
       if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
           continue;
#endif

       if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
           continue;

       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc  =
           dv_vlc_bits[i] << (!!dv_vlc_level[i]);
       dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size =
           dv_vlc_len[i] + (!!dv_vlc_level[i]);
    }
    for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
#if CONFIG_SMALL
       for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
          if (dv_vlc_map[i][j].size == 0) {
              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
                                      dv_vlc_map[0][j].size;
          }
       }
#else
       for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
          if (dv_vlc_map[i][j].size == 0) {
              dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
                        (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
              dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
                                      dv_vlc_map[0][j].size;
          }
          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
                                        dv_vlc_map[i][j].vlc | 1;
          dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
                                        dv_vlc_map[i][j].size;
       }
#endif
    }
}
#endif /* CONFIG_HARDCODED_TABLES */

#endif /* AVCODEC_DV_TABLEGEN_H */