yading@10: /*
yading@10:  * MPEG1/2 common code
yading@10:  * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_MPEG12_H
yading@10: #define AVCODEC_MPEG12_H
yading@10: 
yading@10: #include "mpegvideo.h"
yading@10: 
yading@10: #define DC_VLC_BITS 9
yading@10: #define MV_VLC_BITS 9
yading@10: #define TEX_VLC_BITS 9
yading@10: 
yading@10: #define MBINCR_VLC_BITS 9
yading@10: #define MB_PAT_VLC_BITS 9
yading@10: #define MB_PTYPE_VLC_BITS 6
yading@10: #define MB_BTYPE_VLC_BITS 6
yading@10: 
yading@10: extern VLC ff_dc_lum_vlc;
yading@10: extern VLC ff_dc_chroma_vlc;
yading@10: extern VLC ff_mbincr_vlc;
yading@10: extern VLC ff_mb_ptype_vlc;
yading@10: extern VLC ff_mb_btype_vlc;
yading@10: extern VLC ff_mb_pat_vlc;
yading@10: extern VLC ff_mv_vlc;
yading@10: 
yading@10: extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
yading@10: 
yading@10: void ff_mpeg12_common_init(MpegEncContext *s);
yading@10: void ff_mpeg12_init_vlcs(void);
yading@10: 
yading@10: static inline int decode_dc(GetBitContext *gb, int component)
yading@10: {
yading@10:     int code, diff;
yading@10: 
yading@10:     if (component == 0) {
yading@10:         code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
yading@10:     } else {
yading@10:         code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
yading@10:     }
yading@10:     if (code < 0){
yading@10:         av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
yading@10:         return 0xffff;
yading@10:     }
yading@10:     if (code == 0) {
yading@10:         diff = 0;
yading@10:     } else {
yading@10:         diff = get_xbits(gb, code);
yading@10:     }
yading@10:     return diff;
yading@10: }
yading@10: 
yading@10: int ff_mpeg1_decode_block_intra(MpegEncContext *s, int16_t *block, int n);
yading@10: void ff_mpeg1_clean_buffers(MpegEncContext *s);
yading@10: int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
yading@10: 
yading@10: #endif /* AVCODEC_MPEG12_H */