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116e2a9ee2
The codes can be easily calculated, so the table is unnecessary. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
102 lines
3.4 KiB
C
102 lines
3.4 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 AVCODEC_DV_TABLEGEN_H
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#define AVCODEC_DV_TABLEGEN_H
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#include <stdint.h>
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#include "libavutil/attributes.h"
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#include "dvdata.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 av_cold void dv_vlc_map_tableinit(void)
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{
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uint32_t code = 0;
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int i, j;
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for (int i = 0; i < NB_DV_VLC; i++) {
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uint32_t cur_code = code >> (32 - ff_dv_vlc_len[i]);
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code += 1U << (32 - ff_dv_vlc_len[i]);
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if (ff_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 (ff_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[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size != 0)
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continue;
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dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].vlc =
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cur_code << (!!ff_dv_vlc_level[i]);
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dv_vlc_map[ff_dv_vlc_run[i]][ff_dv_vlc_level[i]].size =
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ff_dv_vlc_len[i] + (!!ff_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 <<
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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 <<
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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 = dv_vlc_map[i][j].vlc | 1;
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dv_vlc_map[i][((uint16_t) (-j)) & 0x1ff].size = 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 /* AVCODEC_DV_TABLEGEN_H */
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