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  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 previous_mba;
  42.     int mba_diff;
  43.     int mtype;
  44.     int current_mv_x;
  45.     int current_mv_y;
  46.     int gob_number;
  47.     int gob_start_code_skipped; // 1 if gob start code is already read before gob header is read
  48. } H261Context;
  49.  
  50. #define MB_TYPE_H261_FIL 0x800000
  51.  
  52. extern uint8_t ff_h261_rl_table_store[2][2 * MAX_RUN + MAX_LEVEL + 3];
  53.  
  54. extern const uint8_t ff_h261_mba_code[35];
  55. extern const uint8_t ff_h261_mba_bits[35];
  56. extern const uint8_t ff_h261_mtype_code[10];
  57. extern const uint8_t ff_h261_mtype_bits[10];
  58. extern const int     ff_h261_mtype_map[10];
  59. extern const uint8_t ff_h261_mv_tab[17][2];
  60. extern const uint8_t ff_h261_cbp_tab[63][2];
  61. extern RLTable ff_h261_rl_tcoeff;
  62.  
  63. void ff_h261_loop_filter(MpegEncContext *s);
  64. void ff_h261_common_init(void);
  65.  
  66. int ff_h261_get_picture_format(int width, int height);
  67. void ff_h261_reorder_mb_index(MpegEncContext *s);
  68. void ff_h261_encode_mb(MpegEncContext *s, int16_t block[6][64],
  69.                        int motion_x, int motion_y);
  70. void ff_h261_encode_picture_header(MpegEncContext *s, int picture_number);
  71. void ff_h261_encode_init(MpegEncContext *s);
  72.  
  73. #endif /* AVCODEC_H261_H */
  74.