FFmpeg  4.4.6
enum_options.c
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1 /*
2  * Copyright (c) 2011 Anton Khirnov
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /*
22  * enumerate avoptions and format them in texinfo format
23  */
24 
25 #include <string.h>
26 
27 #include "libavformat/avformat.h"
28 #include "libavcodec/avcodec.h"
29 #include "libavutil/log.h"
30 #include "libavutil/opt.h"
31 
32 static void print_usage(void)
33 {
34  fprintf(stderr, "Usage: enum_options type\n"
35  "type: format codec\n");
36  exit(1);
37 }
38 
39 static void print_option(const AVClass *class, const AVOption *o)
40 {
41  printf("@item -%s @var{", o->name);
42  switch (o->type) {
43  case AV_OPT_TYPE_BINARY: printf("hexadecimal string"); break;
44  case AV_OPT_TYPE_STRING: printf("string"); break;
45  case AV_OPT_TYPE_INT:
46  case AV_OPT_TYPE_INT64: printf("integer"); break;
47  case AV_OPT_TYPE_FLOAT:
48  case AV_OPT_TYPE_DOUBLE: printf("float"); break;
49  case AV_OPT_TYPE_RATIONAL: printf("rational number"); break;
50  case AV_OPT_TYPE_FLAGS: printf("flags"); break;
51  default: printf("value"); break;
52  }
53  printf("} (@emph{");
54 
56  printf("input");
58  printf("/");
59  }
61  printf("output");
62 
63  printf("})\n");
64  if (o->help)
65  printf("%s\n", o->help);
66 
67  if (o->unit) {
68  const AVOption *u = NULL;
69  printf("\nPossible values:\n@table @samp\n");
70 
71  while ((u = av_opt_next(&class, u)))
72  if (u->type == AV_OPT_TYPE_CONST && u->unit && !strcmp(u->unit, o->unit))
73  printf("@item %s\n%s\n", u->name, u->help ? u->help : "");
74  printf("@end table\n");
75  }
76 }
77 
78 static void show_opts(const AVClass *class)
79 {
80  const AVOption *o = NULL;
81 
82  printf("@table @option\n");
83  while ((o = av_opt_next(&class, o)))
84  if (o->type != AV_OPT_TYPE_CONST)
85  print_option(class, o);
86  printf("@end table\n");
87 }
88 
89 static void show_format_opts(void)
90 {
91  const AVInputFormat *iformat = NULL;
92  const AVOutputFormat *oformat = NULL;
93  void *iformat_opaque = NULL;
94  void *oformat_opaque = NULL;
95 
96  printf("@section Generic format AVOptions\n");
98 
99  printf("@section Format-specific AVOptions\n");
100  while ((iformat = av_demuxer_iterate(&iformat_opaque))) {
101  if (!iformat->priv_class)
102  continue;
103  printf("@subsection %s AVOptions\n", iformat->priv_class->class_name);
105  }
106  while ((oformat = av_muxer_iterate(&oformat_opaque))) {
107  if (!oformat->priv_class)
108  continue;
109  printf("@subsection %s AVOptions\n", oformat->priv_class->class_name);
110  show_opts(oformat->priv_class);
111  }
112 }
113 
114 static void show_codec_opts(void)
115 {
116  void *iter = NULL;
117  const AVCodec *c;
118 
119  printf("@section Generic codec AVOptions\n");
121 
122  printf("@section Codec-specific AVOptions\n");
123  while ((c = av_codec_iterate(&iter))) {
124  if (!c->priv_class)
125  continue;
126  printf("@subsection %s AVOptions\n", c->priv_class->class_name);
127  show_opts(c->priv_class);
128  }
129 }
130 
131 int main(int argc, char **argv)
132 {
133  if (argc < 2)
134  print_usage();
135 
136  if (!strcmp(argv[1], "format"))
138  else if (!strcmp(argv[1], "codec"))
139  show_codec_opts();
140  else
141  print_usage();
142 
143  return 0;
144 }
Libavcodec external API header.
Main libavformat public API header.
#define u(width, name, range_min, range_max)
Definition: cbs_h2645.c:264
#define NULL
Definition: coverity.c:32
static void print_usage(void)
Definition: enum_options.c:32
int main(int argc, char **argv)
Definition: enum_options.c:131
static void show_opts(const AVClass *class)
Definition: enum_options.c:78
static void show_format_opts(void)
Definition: enum_options.c:89
static void show_codec_opts(void)
Definition: enum_options.c:114
static void print_option(const AVClass *class, const AVOption *o)
Definition: enum_options.c:39
static AVInputFormat * iformat
Definition: ffprobe.c:260
const AVOption * av_opt_next(const void *obj, const AVOption *last)
Iterate over all AVOptions belonging to obj.
Definition: opt.c:45
@ AV_OPT_TYPE_CONST
Definition: opt.h:234
@ AV_OPT_TYPE_BINARY
offset must point to a pointer immediately followed by an int for the length
Definition: opt.h:231
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
@ AV_OPT_TYPE_FLAGS
Definition: opt.h:224
@ AV_OPT_TYPE_INT64
Definition: opt.h:226
@ AV_OPT_TYPE_INT
Definition: opt.h:225
@ AV_OPT_TYPE_DOUBLE
Definition: opt.h:227
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:228
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
const AVCodec * av_codec_iterate(void **opaque)
Iterate over all registered codecs.
Definition: allcodecs.c:859
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:311
const AVOutputFormat * av_muxer_iterate(void **opaque)
Iterate over all registered muxers.
Definition: allformats.c:541
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:246
const AVInputFormat * av_demuxer_iterate(void **opaque)
Iterate over all registered demuxers.
Definition: allformats.c:558
AVOptions.
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:278
Describe the class of an AVClass context structure.
Definition: log.h:67
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
AVCodec.
Definition: codec.h:197
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:670
AVOption.
Definition: opt.h:248
const char * unit
The logical unit to which the option belongs.
Definition: opt.h:304
const char * help
short English help text
Definition: opt.h:255
const char * name
Definition: opt.h:249
int flags
Definition: opt.h:277
enum AVOptionType type
Definition: opt.h:262
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:519
static double c[64]