libavformat/options.c

   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 "internal.h"
  23
  24 #include "libavutil/internal.h"
  25 #include "libavutil/opt.h"
  26
  27 /**
  28  * @file
  29  * Options definition for AVFormatContext.
  30  */
  31
  32 FF_DISABLE_DEPRECATION_WARNINGS
  33 #include "options_table.h"
  34 FF_ENABLE_DEPRECATION_WARNINGS
  35
  36 static const char* format_to_name(void* ptr)
  37 {
  38     AVFormatContext* fc = (AVFormatContext*) ptr;
  39     if(fc->iformat) return fc->iformat->name;
  40     else if(fc->oformat) return fc->oformat->name;
  41     else return "NULL";
  42 }
  43
  44 static void *format_child_next(void *obj, void *prev)
  45 {
  46     AVFormatContext *s = obj;
  47     if (!prev && s->priv_data &&
  48         ((s->iformat && s->iformat->priv_class) ||
  49           s->oformat && s->oformat->priv_class))
  50         return s->priv_data;
  51     if (s->pb && s->pb->av_class && prev != s->pb)
  52         return s->pb;
  53     return NULL;
  54 }
  55
  56 static const AVClass *format_child_class_next(const AVClass *prev)
  57 {
  58     AVInputFormat  *ifmt = NULL;
  59     AVOutputFormat *ofmt = NULL;
  60
  61     if (!prev)
  62         return &ff_avio_class;
  63
  64     while ((ifmt = av_iformat_next(ifmt)))
  65         if (ifmt->priv_class == prev)
  66             break;
  67
  68     if (!ifmt)
  69         while ((ofmt = av_oformat_next(ofmt)))
  70             if (ofmt->priv_class == prev)
  71                 break;
  72     if (!ofmt)
  73         while (ifmt = av_iformat_next(ifmt))
  74             if (ifmt->priv_class)
  75                 return ifmt->priv_class;
  76
  77     while (ofmt = av_oformat_next(ofmt))
  78         if (ofmt->priv_class)
  79             return ofmt->priv_class;
  80
  81     return NULL;
  82 }
  83
  84 static AVClassCategory get_category(void *ptr)
  85 {
  86     AVFormatContext* s = ptr;
  87     if(s->iformat) return AV_CLASS_CATEGORY_DEMUXER;
  88     else           return AV_CLASS_CATEGORY_MUXER;
  89 }
  90
  91 static const AVClass av_format_context_class = {
  92     .class_name     = "AVFormatContext",
  93     .item_name      = format_to_name,
  94     .option         = avformat_options,
  95     .version        = LIBAVUTIL_VERSION_INT,
  96     .child_next     = format_child_next,
  97     .child_class_next = format_child_class_next,
  98     .category       = AV_CLASS_CATEGORY_MUXER,
  99     .get_category   = get_category,
 100 };
 101
 102 static int io_open_default(AVFormatContext *s, AVIOContext **pb,
 103                            const char *url, int flags, AVDictionary **options)
 104 {
 105     int loglevel;
 106
 107     if (!strcmp(url, s->filename) ||
 108         s->iformat && !strcmp(s->iformat->name, "image2") ||
 109         s->oformat && !strcmp(s->oformat->name, "image2")
 110     ) {
 111         loglevel = AV_LOG_DEBUG;
 112     } else
 113         loglevel = AV_LOG_INFO;
 114
 115     av_log(s, loglevel, "Opening \'%s\' for %s\n", url, flags & AVIO_FLAG_WRITE ? "writing" : "reading");
 116
 117 #if FF_API_OLD_OPEN_CALLBACKS
 118 FF_DISABLE_DEPRECATION_WARNINGS
 119     if (s->open_cb)
 120         return s->open_cb(s, pb, url, flags, &s->interrupt_callback, options);
 121 FF_ENABLE_DEPRECATION_WARNINGS
 122 #endif
 123
 124     return ffio_open_whitelist(pb, url, flags, &s->interrupt_callback, options, s->protocol_whitelist, s->protocol_blacklist);
 125 }
 126
 127 static void io_close_default(AVFormatContext *s, AVIOContext *pb)
 128 {
 129     avio_close(pb);
 130 }
 131
 132 static void avformat_get_context_defaults(AVFormatContext *s)
 133 {
 134     memset(s, 0, sizeof(AVFormatContext));
 135
 136     s->av_class = &av_format_context_class;
 137
 138     s->io_open  = io_open_default;
 139     s->io_close = io_close_default;
 140
 141     av_opt_set_defaults(s);
 142 }
 143
 144 AVFormatContext *avformat_alloc_context(void)
 145 {
 146     AVFormatContext *ic;
 147     ic = av_malloc(sizeof(AVFormatContext));
 148     if (!ic) return ic;
 149     avformat_get_context_defaults(ic);
 150
 151     ic->internal = av_mallocz(sizeof(*ic->internal));
 152     if (!ic->internal) {
 153         avformat_free_context(ic);
 154         return NULL;
 155     }
 156     ic->internal->offset = AV_NOPTS_VALUE;
 157     ic->internal->raw_packet_buffer_remaining_size = RAW_PACKET_BUFFER_SIZE;
 158     ic->internal->shortest_end = AV_NOPTS_VALUE;
 159
 160     return ic;
 161 }
 162
 163 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx)
 164 {
 165     return ctx->duration_estimation_method;
 166 }
 167
 168 const AVClass *avformat_get_class(void)
 169 {
 170     return &av_format_context_class;
 171 }