1/*
2 * MPEG1/2 common code
3 * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#ifndef AVCODEC_MPEG12_H
23#define AVCODEC_MPEG12_H
24
25#include "mpegvideo.h"
26
27#define DC_VLC_BITS 9
28#define TEX_VLC_BITS 9
29
30static VLC dc_lum_vlc;
31static VLC dc_chroma_vlc;
32
33extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
34
35void ff_mpeg12_common_init(MpegEncContext *s);
36void ff_mpeg12_init_vlcs(void);
37
38static inline int decode_dc(GetBitContext *gb, int component)
39{
40    int code, diff;
41
42    if (component == 0) {
43        code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
44    } else {
45        code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
46    }
47    if (code < 0){
48        av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
49        return 0xffff;
50    }
51    if (code == 0) {
52        diff = 0;
53    } else {
54        diff = get_xbits(gb, code);
55    }
56    return diff;
57}
58
59extern inline int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
60
61#endif /* AVCODEC_MPEG12_H */
62