/*
  * Copyright (c) 2011 Anton Khirnov
  *

  * 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
  */
 
 /*
  * enumerate avoptions and format them in texinfo format
  */
 
 #include <string.h>
 
 #include "libavformat/avformat.h"
 #include "libavcodec/avcodec.h"
 #include "libavutil/log.h"
 #include "libavutil/opt.h"
 
 static void print_usage(void)
 {
     fprintf(stderr, "Usage: enum_options type\n"
             "type: format codec\n");
     exit(1);
 }
 
 static void print_option(const AVClass *class, const AVOption *o)
 {
     printf("@item -%s @var{", o->name);
     switch (o->type) {
     case FF_OPT_TYPE_BINARY:   printf("hexadecimal string"); break;
     case FF_OPT_TYPE_STRING:   printf("string");             break;
     case FF_OPT_TYPE_INT:
     case FF_OPT_TYPE_INT64:    printf("integer");            break;
     case FF_OPT_TYPE_FLOAT:
     case FF_OPT_TYPE_DOUBLE:   printf("float");              break;
     case FF_OPT_TYPE_RATIONAL: printf("rational number");    break;
     case FF_OPT_TYPE_FLAGS:    printf("flags");              break;
     default:                   printf("value");              break;
     }
     printf("} (@emph{");
 
     if (o->flags & AV_OPT_FLAG_ENCODING_PARAM) {
         printf("input");
         if (o->flags & AV_OPT_FLAG_ENCODING_PARAM)
             printf("/");
     }
     if (o->flags & AV_OPT_FLAG_ENCODING_PARAM)
         printf("output");
 
     printf("})\n");
     if (o->help)
         printf("%s\n", o->help);
 
     if (o->unit) {
         const AVOption *u = NULL;
         printf("\nPossible values:\n@table @samp\n");
 
         while ((u = av_next_option(&class, u)))
             if (u->type == FF_OPT_TYPE_CONST && u->unit && !strcmp(u->unit, o->unit))
                 printf("@item %s\n%s\n", u->name, u->help ? u->help : "");
         printf("@end table\n");
     }
 }
 
 static void show_opts(const AVClass *class)
 {
     const AVOption *o = NULL;
 
     printf("@table @option\n");
     while ((o = av_next_option(&class, o)))
         if (o->type != FF_OPT_TYPE_CONST)
             print_option(class, o);
     printf("@end table\n");
 }
 
 static void show_format_opts(void)
 {

     const AVInputFormat *iformat = NULL;
     const AVOutputFormat *oformat = NULL;
     void *iformat_opaque = NULL;
     void *oformat_opaque = NULL;

 
     printf("@section Generic format AVOptions\n");
     show_opts(avformat_get_class());
 
     printf("@section Format-specific AVOptions\n");

     while ((iformat = av_demuxer_iterate(&iformat_opaque))) {

         if (!iformat->priv_class)
             continue;
         printf("@subsection %s AVOptions\n", iformat->priv_class->class_name);
         show_opts(iformat->priv_class);
     }

     while ((oformat = av_muxer_iterate(&oformat_opaque))) {

         if (!oformat->priv_class)
             continue;
         printf("@subsection %s AVOptions\n", oformat->priv_class->class_name);
         show_opts(oformat->priv_class);
     }
 }
 
 static void show_codec_opts(void)
 {

     void *iter = NULL;

     AVCodec *c = NULL;
 
     printf("@section Generic codec AVOptions\n");
     show_opts(avcodec_get_class());
 
     printf("@section Codec-specific AVOptions\n");

     while ((c = av_codec_iterate(&iter))) {

         if (!c->priv_class)
             continue;
         printf("@subsection %s AVOptions\n", c->priv_class->class_name);
         show_opts(c->priv_class);
     }
 }
 
 int main(int argc, char **argv)
 {
     if (argc < 2)
         print_usage();
 
     if (!strcmp(argv[1], "format"))
         show_format_opts();
     else if (!strcmp(argv[1], "codec"))
         show_codec_opts();
     else
         print_usage();
 
     return 0;
 }