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libavcodec/dv_tablegen.h

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00001 /*
00002  * Header file for hardcoded DV tables
00003  *
00004  * Copyright (c) 2010 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #ifndef DV_TABLEGEN_H
00024 #define DV_TABLEGEN_H
00025 
00026 #include <stdint.h>
00027 #include "dv_vlc_data.h"
00028 
00029 #if CONFIG_SMALL
00030 #define DV_VLC_MAP_RUN_SIZE 15
00031 #define DV_VLC_MAP_LEV_SIZE 23
00032 #else
00033 #define DV_VLC_MAP_RUN_SIZE  64
00034 #define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
00035 #endif
00036 
00037 /* VLC encoding lookup table */
00038 struct dv_vlc_pair {
00039    uint32_t vlc;
00040    uint32_t size;
00041 };
00042 
00043 #if CONFIG_HARDCODED_TABLES
00044 #define dv_vlc_map_tableinit()
00045 #include "libavcodec/dv_tables.h"
00046 #else
00047 static struct dv_vlc_pair dv_vlc_map[DV_VLC_MAP_RUN_SIZE][DV_VLC_MAP_LEV_SIZE];
00048 
00049 static void dv_vlc_map_tableinit(void)
00050 {
00051     int i, j;
00052     for (i = 0; i < NB_DV_VLC - 1; i++) {
00053        if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
00054            continue;
00055 #if CONFIG_SMALL
00056        if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
00057            continue;
00058 #endif
00059 
00060        if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
00061            continue;
00062 
00063        dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc  =
00064            dv_vlc_bits[i] << (!!dv_vlc_level[i]);
00065        dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size =
00066            dv_vlc_len[i] + (!!dv_vlc_level[i]);
00067     }
00068     for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
00069 #if CONFIG_SMALL
00070        for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
00071           if (dv_vlc_map[i][j].size == 0) {
00072               dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
00073                         (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
00074               dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
00075                                       dv_vlc_map[0][j].size;
00076           }
00077        }
00078 #else
00079        for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
00080           if (dv_vlc_map[i][j].size == 0) {
00081               dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
00082                         (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
00083               dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
00084                                       dv_vlc_map[0][j].size;
00085           }
00086           dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
00087                                         dv_vlc_map[i][j].vlc | 1;
00088           dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
00089                                         dv_vlc_map[i][j].size;
00090        }
00091 #endif
00092     }
00093 }
00094 #endif /* CONFIG_HARDCODED_TABLES */
00095 
00096 #endif /* DV_TABLEGEN_H */

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