FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
h261.h
Go to the documentation of this file.
1 /*
2  * H261 decoder
3  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
4  * Copyright (c) 2004 Maarten Daniels
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * h261codec.
26  */
27 
28 #ifndef AVCODEC_H261_H
29 #define AVCODEC_H261_H
30 
31 #include "mpegvideo.h"
32 #include "rl.h"
33 
34 /**
35  * H261Context
36  */
37 typedef struct H261Context {
39 
41  int mba_diff;
42  int mtype;
46  int gob_start_code_skipped; // 1 if gob start code is already read before gob header is read
47 } H261Context;
48 
49 #define MB_TYPE_H261_FIL 0x800000
50 
51 extern uint8_t ff_h261_rl_table_store[2][2 * MAX_RUN + MAX_LEVEL + 3];
52 
53 extern const uint8_t ff_h261_mba_code[35];
54 extern const uint8_t ff_h261_mba_bits[35];
55 extern const uint8_t ff_h261_mtype_code[10];
56 extern const uint8_t ff_h261_mtype_bits[10];
57 extern const int ff_h261_mtype_map[10];
58 extern const uint8_t ff_h261_mv_tab[17][2];
59 extern const uint8_t ff_h261_cbp_tab[63][2];
61 
63 void ff_h261_common_init(void);
64 
67 void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
68  int motion_x, int motion_y);
69 void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number);
71 
72 #endif /* AVCODEC_H261_H */