ffmpeg/libavcodec/h261.h

   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 {
  38     MpegEncContext s;
  39
  40     int current_mba;
  41     int mba_diff;
  42     int mtype;
  43     int current_mv_x;
  44     int current_mv_y;
  45     int gob_number;
  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];
  60 extern RLTable ff_h261_rl_tcoeff;
  61
  62 void ff_h261_loop_filter(MpegEncContext *s);
  63 void ff_h261_common_init(void);
  64
  65 int ff_h261_get_picture_format(int width, int height);
  66 void ff_h261_reorder_mb_index(MpegEncContext *s);
  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);
  70 void ff_h261_encode_init(MpegEncContext *s);
  71
  72 #endif /* AVCODEC_H261_H */