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* MPEG-1/2 common code
* Copyright (c) 2007 Aurelien Jacobs <>
* 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
* 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 "mpeg12vlc.h"
#include "mpegvideo.h"
extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
void ff_mpeg12_common_init(MpegEncContext *s);
#define INIT_2D_VLC_RL(rl, static_size, flags)\
static RL_VLC_ELEM rl_vlc_table[static_size];\
rl.rl_vlc[0] = rl_vlc_table;\
ff_init_2d_vlc_rl(&rl, static_size, flags);\
void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags);
void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len);
static inline int decode_dc(GetBitContext *gb, int component)
int code, diff;
if (component == 0) {
code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
} else {
code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
if (code == 0) {
diff = 0;
} else {
diff = get_xbits(gb, code);
return diff;
int ff_mpeg1_decode_block_intra(GetBitContext *gb,
const uint16_t *quant_matrix,
uint8_t *const scantable, int last_dc[3],
int16_t *block, int index, int qscale);
void ff_mpeg1_clean_buffers(MpegEncContext *s);
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
int motion_x, int motion_y);
void ff_mpeg1_encode_init(MpegEncContext *s);
void ff_mpeg1_encode_slice_header(MpegEncContext *s);
void ff_mpeg12_find_best_frame_rate(AVRational frame_rate,
int *code, int *ext_n, int *ext_d,
int nonstandard);
#endif /* AVCODEC_MPEG12_H */