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2ba45a60 DM |
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 MV_VLC_BITS 9 | |
29 | #define TEX_VLC_BITS 9 | |
30 | ||
31 | #define MBINCR_VLC_BITS 9 | |
32 | #define MB_PAT_VLC_BITS 9 | |
33 | #define MB_PTYPE_VLC_BITS 6 | |
34 | #define MB_BTYPE_VLC_BITS 6 | |
35 | ||
36 | extern VLC ff_dc_lum_vlc; | |
37 | extern VLC ff_dc_chroma_vlc; | |
38 | extern VLC ff_mbincr_vlc; | |
39 | extern VLC ff_mb_ptype_vlc; | |
40 | extern VLC ff_mb_btype_vlc; | |
41 | extern VLC ff_mb_pat_vlc; | |
42 | extern VLC ff_mv_vlc; | |
43 | ||
44 | extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; | |
45 | ||
46 | void ff_mpeg12_common_init(MpegEncContext *s); | |
47 | void ff_mpeg12_init_vlcs(void); | |
48 | ||
49 | static inline int decode_dc(GetBitContext *gb, int component) | |
50 | { | |
51 | int code, diff; | |
52 | ||
53 | if (component == 0) { | |
54 | code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2); | |
55 | } else { | |
56 | code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2); | |
57 | } | |
58 | if (code < 0){ | |
59 | av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n"); | |
60 | return 0xffff; | |
61 | } | |
62 | if (code == 0) { | |
63 | diff = 0; | |
64 | } else { | |
65 | diff = get_xbits(gb, code); | |
66 | } | |
67 | return diff; | |
68 | } | |
69 | ||
70 | int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n); | |
71 | void ff_mpeg1_clean_buffers(MpegEncContext *s); | |
72 | int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s); | |
73 | ||
74 | #endif /* AVCODEC_MPEG12_H */ |