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