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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 "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 */
  75.