doc/print_options.c

   1 /*
   2  * Copyright (c) 2012 Anton Khirnov
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /*
  22  * generate texinfo manpages for avoptions
  23  */
  24
  25 #include <stddef.h>
  26 #include <string.h>
  27 #include <float.h>
  28
  29 #include "libavformat/avformat.h"
  30 #include "libavcodec/avcodec.h"
  31 #include "libavutil/opt.h"
  32
  33 static void print_usage(void)
  34 {
  35     fprintf(stderr, "Usage: enum_options type\n"
  36             "type: format codec\n");
  37     exit(1);
  38 }
  39
  40 static void print_option(const AVOption *opts, const AVOption *o, int per_stream)
  41 {
  42     printf("@item -%s%s @var{", o->name, per_stream ? "[:stream_specifier]" : "");
  43     switch (o->type) {
  44     case AV_OPT_TYPE_BINARY:   printf("hexadecimal string"); break;
  45     case AV_OPT_TYPE_STRING:   printf("string");             break;
  46     case AV_OPT_TYPE_INT:
  47     case AV_OPT_TYPE_INT64:    printf("integer");            break;
  48     case AV_OPT_TYPE_FLOAT:
  49     case AV_OPT_TYPE_DOUBLE:   printf("float");              break;
  50     case AV_OPT_TYPE_RATIONAL: printf("rational number");    break;
  51     case AV_OPT_TYPE_FLAGS:    printf("flags");              break;
  52     default:                   printf("value");              break;
  53     }
  54     printf("} (@emph{");
  55
  56     if (o->flags & AV_OPT_FLAG_DECODING_PARAM) {
  57         printf("input");
  58         if (o->flags & AV_OPT_FLAG_ENCODING_PARAM)
  59             printf("/");
  60     }
  61     if (o->flags & AV_OPT_FLAG_ENCODING_PARAM) printf("output");
  62     if (o->flags & AV_OPT_FLAG_AUDIO_PARAM)    printf(",audio");
  63     if (o->flags & AV_OPT_FLAG_VIDEO_PARAM)    printf(",video");
  64     if (o->flags & AV_OPT_FLAG_SUBTITLE_PARAM) printf(",subtitles");
  65
  66     printf("})\n");
  67     if (o->help)
  68         printf("%s\n", o->help);
  69
  70     if (o->unit) {
  71         const AVOption *u;
  72         printf("\nPossible values:\n@table @samp\n");
  73
  74         for (u = opts; u->name; u++) {
  75             if (u->type == AV_OPT_TYPE_CONST && u->unit && !strcmp(u->unit, o->unit))
  76                 printf("@item %s\n%s\n", u->name, u->help ? u->help : "");
  77         }
  78         printf("@end table\n");
  79     }
  80 }
  81
  82 static void show_opts(const AVOption *opts, int per_stream)
  83 {
  84     const AVOption *o;
  85
  86     printf("@table @option\n");
  87     for (o = opts; o->name; o++) {
  88         if (o->type != AV_OPT_TYPE_CONST)
  89             print_option(opts, o, per_stream);
  90     }
  91     printf("@end table\n");
  92 }
  93
  94 static void show_format_opts(void)
  95 {
  96 #include "libavformat/options_table.h"
  97
  98     printf("@section Format AVOptions\n");
  99     show_opts(options, 0);
 100 }
 101
 102 static void show_codec_opts(void)
 103 {
 104 #include "libavcodec/options_table.h"
 105
 106     printf("@section Codec AVOptions\n");
 107     show_opts(options, 1);
 108 }
 109
 110 int main(int argc, char **argv)
 111 {
 112     if (argc < 2)
 113         print_usage();
 114
 115     if (!strcmp(argv[1], "format"))
 116         show_format_opts();
 117     else if (!strcmp(argv[1], "codec"))
 118         show_codec_opts();
 119     else
 120         print_usage();
 121
 122     return 0;
 123 }