FFmpeg
mpeg12.h
Go to the documentation of this file.
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 
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 static inline int decode_dc(GetBitContext *gb, int component)
51 {
52  int code, diff;
53 
54  if (component == 0) {
56  } else {
58  }
59  if (code == 0) {
60  diff = 0;
61  } else {
62  diff = get_xbits(gb, code);
63  }
64  return diff;
65 }
66 
68  const uint16_t *quant_matrix,
69  uint8_t *const scantable, int last_dc[3],
70  int16_t *block, int index, int qscale);
71 
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);
82 
84  int *code, int *ext_n, int *ext_d,
85  int nonstandard);
86 
87 #endif /* AVCODEC_MPEG12_H */
ff_dc_chroma_vlc
VLC ff_dc_chroma_vlc
Definition: mpeg12.c:129
index
fg index
Definition: ffmpeg_filter.c:168
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:798
mpegvideo.h
ff_mpeg1_clean_buffers
void ff_mpeg1_clean_buffers(MpegEncContext *s)
Definition: mpeg12.c:114
ff_mpeg1_init_uni_ac_vlc
void ff_mpeg1_init_uni_ac_vlc(const RLTable *rl, uint8_t *uni_ac_vlc_len)
Definition: mpeg12enc.c:68
ff_mpeg12_find_best_frame_rate
void ff_mpeg12_find_best_frame_rate(AVRational frame_rate, int *code, int *ext_n, int *ext_d, int nonstandard)
Definition: mpeg12framerate.c:44
ff_mpeg1_encode_picture_header
void ff_mpeg1_encode_picture_header(MpegEncContext *s, int picture_number)
ff_init_2d_vlc_rl
void ff_init_2d_vlc_rl(RLTable *rl, unsigned static_size, int flags)
Definition: mpeg12.c:69
ParseContext
Definition: parser.h:28
RLTable
RLTable.
Definition: rl.h:39
GetBitContext
Definition: get_bits.h:62
mpeg12vlc.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ff_mpeg1_decode_block_intra
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)
Definition: mpeg12.c:239
ff_mpeg1_encode_slice_header
void ff_mpeg1_encode_slice_header(MpegEncContext *s)
ff_mpeg1_encode_mb
void ff_mpeg1_encode_mb(MpegEncContext *s, int16_t block[8][64], int motion_x, int motion_y)
ff_mpeg12_common_init
void ff_mpeg12_common_init(MpegEncContext *s)
Definition: mpeg12.c:106
get_xbits
static int get_xbits(GetBitContext *s, int n)
Read MPEG-1 dc-style VLC (sign bit + mantissa with no MSB).
Definition: get_bits.h:322
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AVCodecParserContext
Definition: avcodec.h:2775
ff_mpeg1_find_frame_end
int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size, AVCodecParserContext *s)
Find the end of the current frame in the bitstream.
Definition: mpeg12.c:176
ff_dc_lum_vlc
VLC ff_dc_lum_vlc
Definition: mpeg12.c:128
decode_dc
static int decode_dc(GetBitContext *gb, int component)
Definition: mpeg12.h:50
ff_mpeg1_encode_init
void ff_mpeg1_encode_init(MpegEncContext *s)
diff
static av_always_inline int diff(const uint32_t a, const uint32_t b)
Definition: vf_palettegen.c:139
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
DC_VLC_BITS
#define DC_VLC_BITS
Definition: intrax8.c:40
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:71
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28