FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/mpeg12.h
Date: 2021-09-24 03:35:22
Exec Total Coverage
Lines: 8 8 100.0%
Branches: 4 4 100.0%

Line Branch Exec Source
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 /* Start codes. */
29 #define SEQ_END_CODE 0x000001b7
30 #define SEQ_START_CODE 0x000001b3
31 #define GOP_START_CODE 0x000001b8
32 #define PICTURE_START_CODE 0x00000100
33 #define SLICE_MIN_START_CODE 0x00000101
34 #define SLICE_MAX_START_CODE 0x000001af
35 #define EXT_START_CODE 0x000001b5
36 #define USER_START_CODE 0x000001b2
37
38 void ff_mpeg12_common_init(MpegEncContext *s);
39
40 #define INIT_2D_VLC_RL(rl, static_size, flags)\
41 {\
42 static RL_VLC_ELEM rl_vlc_table[static_size];\
43 rl.rl_vlc[0] = rl_vlc_table;\
44 ff_init_2d_vlc_rl(&rl, static_size, flags);\
45 }
46
47 void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags);
48 void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len);
49
50 1798482 static inline int decode_dc(GetBitContext *gb, int component)
51 {
52 int code, diff;
53
54
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1798482 if (component == 0) {
55 1127244 code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
56 } else {
57 671238 code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
58 }
59
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1798482 if (code == 0) {
60 238928 diff = 0;
61 } else {
62 1559554 diff = get_xbits(gb, code);
63 }
64 1798482 return diff;
65 }
66
67 int ff_mpeg1_decode_block_intra(GetBitContext *gb,
68 const uint16_t *quant_matrix,
69 uint8_t *const scantable, int last_dc[3],
70 int16_t *block, int index, int qscale);
71
72 void ff_mpeg1_clean_buffers(MpegEncContext *s);
73 #if FF_API_FLAG_TRUNCATED
74 int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s);
75 #endif
76
77 void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number);
78 void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64],
79 int motion_x, int motion_y);
80 void ff_mpeg1_encode_init(MpegEncContext *s);
81 void ff_mpeg1_encode_slice_header(MpegEncContext *s);
82
83 void ff_mpeg12_find_best_frame_rate(AVRational frame_rate,
84 int *code, int *ext_n, int *ext_d,
85 int nonstandard);
86
87 #endif /* AVCODEC_MPEG12_H */
88