mpeg12: Move finding the best frame rate to common code
[libav.git] / libavcodec / mpeg12.h
1 /*
2 * MPEG-1/2 common code
3 * Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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 extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
29
30 void ff_mpeg12_common_init(MpegEncContext *s);
31
32 static inline int decode_dc(GetBitContext *gb, int component)
33 {
34 int code, diff;
35
36 if (component == 0) {
37 code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
38 } else {
39 code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
40 }
41 if (code < 0){
42 av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
43 return 0xffff;
44 }
45 if (code == 0) {
46 diff = 0;
47 } else {
48 diff = get_xbits(gb, code);
49 }
50 return diff;
51 }
52
53 int ff_mpeg1_decode_block_intra(GetBitContext *gb,
54 const uint16_t *quant_matrix,
55 uint8_t *const scantable, int last_dc[3],
56 int16_t *block, int index, int qscale);
57
58 void ff_mpeg1_clean_buffers(MpegEncContext *s);
59 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
60
61 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
62 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
63 int motion_x, int motion_y);
64 void ff_mpeg1_encode_init(MpegEncContext *s);
65 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
66
67 void ff_mpeg12_find_best_frame_rate(AVRational frame_rate,
68 int *code, int *ext_n, int *ext_d,
69 int nonstandard);
70
71 #endif /* AVCODEC_MPEG12_H */