1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* 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_CBS_BSF_H
#define AVCODEC_CBS_BSF_H
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "bsf.h"
#include "codec_id.h"
#include "cbs.h"
#include "packet.h"
typedef struct CBSBSFType {
enum AVCodecID codec_id;
// Name of a frame fragment in this codec (e.g. "access unit",
// "temporal unit").
const char *fragment_name;
// Name of a unit for this BSF, for use in error messages (e.g.
// "NAL unit", "OBU").
const char *unit_name;
// Update the content of a fragment with whatever metadata changes
// are desired. The associated AVPacket is provided so that any side
// data associated with the fragment can be inspected or edited. If
// pkt is NULL, then an extradata header fragment is being updated.
int (*update_fragment)(AVBSFContext *bsf, AVPacket *pkt,
CodedBitstreamFragment *frag);
} CBSBSFType;
// Common structure for all generic CBS BSF users. An instance of this
// structure must be the first member of the BSF private context (to be
// pointed to by AVBSFContext.priv_data).
typedef struct CBSBSFContext {
const AVClass *class;
const CBSBSFType *type;
CodedBitstreamContext *input;
CodedBitstreamContext *output;
CodedBitstreamFragment fragment;
} CBSBSFContext;
/**
* Initialise generic CBS BSF setup.
*
* Creates the input and output CBS instances, and applies the filter to
* the extradata on the input codecpar if any is present.
*
* Since it calls the update_fragment() function immediately to deal with
* extradata, this should be called after any codec-specific setup is done
* (probably at the end of the FFBitStreamFilter.init function).
*/
int ff_cbs_bsf_generic_init(AVBSFContext *bsf, const CBSBSFType *type);
/**
* Close a generic CBS BSF instance.
*
* If no other deinitialisation is required then this function can be used
* directly as FFBitStreamFilter.close.
*/
void ff_cbs_bsf_generic_close(AVBSFContext *bsf);
/**
* Filter operation for CBS BSF.
*
* Reads the input packet into a CBS fragment, calls update_fragment() on
* it, then writes the result to an output packet. If the input packet
* has AV_PKT_DATA_NEW_EXTRADATA side-data associated with it then it does
* the same thing to that new extradata to form the output side-data first.
*
* If the BSF does not do anything else then this function can be used
* directly as FFBitStreamFilter.filter.
*/
int ff_cbs_bsf_generic_filter(AVBSFContext *bsf, AVPacket *pkt);
// Options for element manipulation.
enum {
// Pass this element through unchanged.
BSF_ELEMENT_PASS,
// Insert this element, replacing any existing instances of it.
// Associated values may be provided explicitly (as addtional options)
// or implicitly (either as side data or deduced from other parts of
// the stream).
BSF_ELEMENT_INSERT,
// Remove this element if it appears in the stream.
BSF_ELEMENT_REMOVE,
// Extract this element to side data, so that further manipulation
// can happen elsewhere.
BSF_ELEMENT_EXTRACT,
};
#define BSF_ELEMENT_OPTIONS_PIR(name, help, field, opt_flags) \
{ name, help, OFFSET(field), AV_OPT_TYPE_INT, \
{ .i64 = BSF_ELEMENT_PASS }, \
BSF_ELEMENT_PASS, BSF_ELEMENT_REMOVE, opt_flags, name }, \
{ "pass", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_PASS }, .flags = opt_flags, .unit = name }, \
{ "insert", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_INSERT }, .flags = opt_flags, .unit = name }, \
{ "remove", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_REMOVE }, .flags = opt_flags, .unit = name }
#define BSF_ELEMENT_OPTIONS_PIRE(name, help, field, opt_flags) \
{ name, help, OFFSET(field), AV_OPT_TYPE_INT, \
{ .i64 = BSF_ELEMENT_PASS }, \
BSF_ELEMENT_PASS, BSF_ELEMENT_EXTRACT, opt_flags, name }, \
{ "pass", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_PASS }, .flags = opt_flags, .unit = name }, \
{ "insert", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_INSERT }, .flags = opt_flags, .unit = name }, \
{ "remove", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_REMOVE }, .flags = opt_flags, .unit = name }, \
{ "extract", NULL, 0, AV_OPT_TYPE_CONST, \
{ .i64 = BSF_ELEMENT_EXTRACT }, .flags = opt_flags, .unit = name } \
#endif /* AVCODEC_CBS_BSF_H */
|
