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  1. /*
  2.  * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
  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. #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 AVClassCategory get_category(void *ptr)
  80. {
  81.     AVFormatContext* s = ptr;
  82.     if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
  83.     else           return AV_CLASS_CATEGORY_MUXER;
  84. }
  85.  
  86. static const AVClass av_format_context_class = {
  87.     .class_name     = "AVFormatContext",
  88.     .item_name      = format_to_name,
  89.     .option         = avformat_options,
  90.     .version        = LIBAVUTIL_VERSION_INT,
  91.     .child_next     = format_child_next,
  92.     .child_class_next = format_child_class_next,
  93.     .category       = AV_CLASS_CATEGORY_MUXER,
  94.     .get_category   = get_category,
  95. };
  96.  
  97. static void avformat_get_context_defaults(AVFormatContext *s)
  98. {
  99.     memset(s, 0, sizeof(AVFormatContext));
  100.  
  101.     s->av_class = &av_format_context_class;
  102.  
  103.     av_opt_set_defaults(s);
  104. }
  105.  
  106. AVFormatContext *avformat_alloc_context(void)
  107. {
  108.     AVFormatContext *ic;
  109.     ic = av_malloc(sizeof(AVFormatContext));
  110.     if (!ic) return ic;
  111.     avformat_get_context_defaults(ic);
  112.     return ic;
  113. }
  114.  
  115. enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
  116. {
  117.     return ctx->duration_estimation_method;
  118. }
  119.  
  120. const AVClass *avformat_get_class(void)
  121. {
  122.     return &av_format_context_class;
  123. }
  124.