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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 FF_OPT_TYPE_BINARY: printf("hexadecimal string"); break;
44  case FF_OPT_TYPE_STRING: printf("string"); break;
45  case FF_OPT_TYPE_INT:
46  case FF_OPT_TYPE_INT64: printf("integer"); break;
47  case FF_OPT_TYPE_FLOAT:
48  case FF_OPT_TYPE_DOUBLE: printf("float"); break;
49  case FF_OPT_TYPE_RATIONAL: printf("rational number"); break;
50  case FF_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_next_option(&class, u)))
72  if (u->type == FF_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_next_option(&class, o)))
84  if (o->type != FF_OPT_TYPE_CONST)
85  print_option(class, o);
86  printf("@end table\n");
87 }
88 
89 static void show_format_opts(void)
90 {
92  AVOutputFormat *oformat = NULL;
93 
94  printf("@section Generic format AVOptions\n");
96 
97  printf("@section Format-specific AVOptions\n");
98  while ((iformat = av_iformat_next(iformat))) {
99  if (!iformat->priv_class)
100  continue;
101  printf("@subsection %s AVOptions\n", iformat->priv_class->class_name);
102  show_opts(iformat->priv_class);
103  }
104  while ((oformat = av_oformat_next(oformat))) {
105  if (!oformat->priv_class)
106  continue;
107  printf("@subsection %s AVOptions\n", oformat->priv_class->class_name);
108  show_opts(oformat->priv_class);
109  }
110 }
111 
112 static void show_codec_opts(void)
113 {
114  AVCodec *c = NULL;
115 
116  printf("@section Generic codec AVOptions\n");
118 
119  printf("@section Codec-specific AVOptions\n");
120  while ((c = av_codec_next(c))) {
121  if (!c->priv_class)
122  continue;
123  printf("@subsection %s AVOptions\n", c->priv_class->class_name);
124  show_opts(c->priv_class);
125  }
126 }
127 
128 int main(int argc, char **argv)
129 {
130  if (argc < 2)
131  print_usage();
132 
133  av_register_all();
134 
135  if (!strcmp(argv[1], "format"))
137  else if (!strcmp(argv[1], "codec"))
138  show_codec_opts();
139  else
140  print_usage();
141 
142  return 0;
143 }
#define NULL
Definition: coverity.c:32
offset must point to a pointer immediately followed by an int for the length
Definition: opt.h:247
AVOption.
Definition: opt.h:255
AVCodec.
Definition: avcodec.h:3207
const AVClass * avcodec_get_class(void)
Get the AVClass for AVCodecContext.
Definition: options.c:256
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
const char * name
Definition: opt.h:256
static void print_option(const AVClass *class, const AVOption *o)
Definition: enum_options.c:39
const char * help
short English help text
Definition: opt.h:262
AVOptions.
static void show_format_opts(void)
Definition: enum_options.c:89
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:653
const AVClass * avformat_get_class(void)
Get the AVClass for AVFormatContext.
Definition: options.c:130
#define AV_OPT_FLAG_ENCODING_PARAM
a generic parameter which can be set by the user for muxing or encoding
Definition: opt.h:285
int main(int argc, char **argv)
Definition: enum_options.c:128
AVCodec * av_codec_next(const AVCodec *c)
If c is NULL, returns the first registered codec, if c is non-NULL, returns the next registered codec...
Definition: utils.c:167
static void show_opts(const AVClass *class)
Definition: enum_options.c:78
Libavcodec external API header.
const char * unit
The logical unit to which the option belongs.
Definition: opt.h:310
float u
const AVClass * priv_class
AVClass for the private context.
Definition: avformat.h:541
AVOutputFormat * av_oformat_next(const AVOutputFormat *f)
If f is NULL, returns the first registered output format, if f is non-NULL, returns the next register...
Definition: format.c:53
int flags
Definition: opt.h:284
static AVInputFormat * iformat
Definition: ffprobe.c:214
Describe the class of an AVClass context structure.
Definition: log.h:67
const AVOption * av_next_option(FF_CONST_AVUTIL55 void *obj, const AVOption *last)
Definition: opt.c:45
const AVClass * priv_class
AVClass for the private context.
Definition: avcodec.h:3235
Main libavformat public API header.
static double c[64]
static void show_codec_opts(void)
Definition: enum_options.c:112
enum AVOptionType type
Definition: opt.h:269
void av_register_all(void)
Initialize libavformat and register all the muxers, demuxers and protocols.
Definition: allformats.c:51
static void print_usage(void)
Definition: enum_options.c:32
AVInputFormat * av_iformat_next(const AVInputFormat *f)
If f is NULL, returns the first registered input format, if f is non-NULL, returns the next registere...
Definition: format.c:45