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libavcodec/mpeg12.h

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00001 /*
00002  * MPEG1/2 common code
00003  * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00022 #ifndef AVCODEC_MPEG12_H
00023 #define AVCODEC_MPEG12_H
00024 
00025 #include "mpegvideo.h"
00026 
00027 #define DC_VLC_BITS 9
00028 #define TEX_VLC_BITS 9
00029 
00030 static VLC dc_lum_vlc;
00031 static VLC dc_chroma_vlc;
00032 
00033 extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
00034 
00035 void ff_mpeg12_common_init(MpegEncContext *s);
00036 void ff_mpeg12_init_vlcs(void);
00037 
00038 static inline int decode_dc(GetBitContext *gb, int component)
00039 {
00040     int code, diff;
00041 
00042     if (component == 0) {
00043         code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2);
00044     } else {
00045         code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2);
00046     }
00047     if (code < 0){
00048         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
00049         return 0xffff;
00050     }
00051     if (code == 0) {
00052         diff = 0;
00053     } else {
00054         diff = get_xbits(gb, code);
00055     }
00056     return diff;
00057 }
00058 
00059 extern int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
00060 
00061 #endif /* AVCODEC_MPEG12_H */

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