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  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 "mpeg12vlc.h"
  26. #include "mpegvideo.h"
  27.  
  28. extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  29.  
  30. void ff_mpeg12_common_init(MpegEncContext *s);
  31.  
  32. static inline int decode_dc(GetBitContext *gb, int component)
  33. {
  34.     int code, diff;
  35.  
  36.     if (component == 0) {
  37.         code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
  38.     } else {
  39.         code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
  40.     }
  41.     if (code < 0){
  42.         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
  43.         return 0xffff;
  44.     }
  45.     if (code == 0) {
  46.         diff = 0;
  47.     } else {
  48.         diff = get_xbits(gb, code);
  49.     }
  50.     return diff;
  51. }
  52.  
  53. int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n);
  54. void ff_mpeg1_clean_buffers(MpegEncContext *s);
  55. int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
  56.  
  57. void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
  58. void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
  59.                         int motion_x, int motion_y);
  60. void ff_mpeg1_encode_init(MpegEncContext *s);
  61. void ff_mpeg1_encode_slice_header(MpegEncContext *s);
  62.  
  63. #endif /* AVCODEC_MPEG12_H */
  64.