ffmpeg/libavcodec/mpeg12.h

   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 */