libavformat/options.c

   1 /*
   2  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
   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 #include "avformat.h"
  21 #include "avio_internal.h"
  22 #include "libavutil/opt.h"
  23
  24 /**
  25  * @file
  26  * Options definition for AVFormatContext.
  27  */
  28
  29 #include "options_table.h"
  30
  31 static const char* format_to_name(void* ptr)
  32 {
  33     AVFormatContext* fc = (AVFormatContext*) ptr;
  34     if(fc->iformat) return fc->iformat->name;
  35     else if(fc->oformat) return fc->oformat->name;
  36     else return "NULL";
  37 }
  38
  39 static void *format_child_next(void *obj, void *prev)
  40 {
  41     AVFormatContext *s = obj;
  42     if (!prev && s->priv_data &&
  43         ((s->iformat && s->iformat->priv_class) ||
  44           s->oformat && s->oformat->priv_class))
  45         return s->priv_data;
  46     if (s->pb && s->pb->av_class && prev != s->pb)
  47         return s->pb;
  48     return NULL;
  49 }
  50
  51 static const AVClass *format_child_class_next(const AVClass *prev)
  52 {
  53     AVInputFormat  *ifmt = NULL;
  54     AVOutputFormat *ofmt = NULL;
  55
  56     if (!prev)
  57         return &ffio_url_class;
  58
  59     while ((ifmt = av_iformat_next(ifmt)))
  60         if (ifmt->priv_class == prev)
  61             break;
  62
  63     if (!ifmt)
  64         while ((ofmt = av_oformat_next(ofmt)))
  65             if (ofmt->priv_class == prev)
  66                 break;
  67     if (!ofmt)
  68         while (ifmt = av_iformat_next(ifmt))
  69             if (ifmt->priv_class)
  70                 return ifmt->priv_class;
  71
  72     while (ofmt = av_oformat_next(ofmt))
  73         if (ofmt->priv_class)
  74             return ofmt->priv_class;
  75
  76     return NULL;
  77 }
  78
  79 static const AVClass av_format_context_class = {
  80     .class_name     = "AVFormatContext",
  81     .item_name      = format_to_name,
  82     .option         = options,
  83     .version        = LIBAVUTIL_VERSION_INT,
  84     .child_next     = format_child_next,
  85     .child_class_next = format_child_class_next,
  86 };
  87
  88 static void avformat_get_context_defaults(AVFormatContext *s)
  89 {
  90     memset(s, 0, sizeof(AVFormatContext));
  91
  92     s->av_class = &av_format_context_class;
  93
  94     av_opt_set_defaults(s);
  95 }
  96
  97 AVFormatContext *avformat_alloc_context(void)
  98 {
  99     AVFormatContext *ic;
 100     ic = av_malloc(sizeof(AVFormatContext));
 101     if (!ic) return ic;
 102     avformat_get_context_defaults(ic);
 103     return ic;
 104 }
 105
 106 const AVClass *avformat_get_class(void)
 107 {
 108     return &av_format_context_class;
 109 }