1 /*
2 * MPEG-1/2 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 "mpeg12vlc.h"
26 #include "mpegvideo.h"
27
28 void ff_mpeg12_common_init(MpegEncContext *s);
29
30 #define INIT_2D_VLC_RL(rl, static_size, flags)\
31 {\
32 static RL_VLC_ELEM rl_vlc_table[static_size];\
33 rl.rl_vlc[0] = rl_vlc_table;\
34 ff_init_2d_vlc_rl(&rl, static_size, flags);\
35 }
36
37 void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags);
38 void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len);
39
decode_dc(GetBitContext * gb,int component)40 static inline int decode_dc(GetBitContext *gb, int component)
41 {
42 int code, diff;
43
44 if (component == 0) {
45 code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
46 } else {
47 code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
48 }
49 if (code == 0) {
50 diff = 0;
51 } else {
52 diff = get_xbits(gb, code);
53 }
54 return diff;
55 }
56
57 int ff_mpeg1_decode_block_intra(GetBitContext *gb,
58 const uint16_t *quant_matrix,
59 uint8_t *const scantable, int last_dc[3],
60 int16_t *block, int index, int qscale);
61
62 void ff_mpeg1_clean_buffers(MpegEncContext *s);
63 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
64
65 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
66 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
67 int motion_x, int motion_y);
68 void ff_mpeg1_encode_init(MpegEncContext *s);
69 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
70
71 void ff_mpeg12_find_best_frame_rate(AVRational frame_rate,
72 int *code, int *ext_n, int *ext_d,
73 int nonstandard);
74
75 #endif /* AVCODEC_MPEG12_H */
76