+ AVFormatContext* weak_context = nullptr;
+
+ switch (resource_type) {
+ case FFMPEG_Resource::FFMPEG_FILE:
+ THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(resource_name).c_str(), nullptr, nullptr), resource_name);
+ break;
+ case FFMPEG_Resource::FFMPEG_DEVICE:
+ {
+ AVDictionary* format_options = NULL;
+ for (auto& option : vid_params)
+ {
+ av_dict_set(&format_options, option.first.c_str(), option.second.c_str(), 0);
+ }
+ AVInputFormat* input_format = av_find_input_format("dshow");
+ THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(resource_name).c_str(), input_format, &format_options), resource_name);
+ if (format_options != nullptr)
+ {
+ std::string unsupported_tokens = "";
+ AVDictionaryEntry *t = NULL;
+ while ((t = av_dict_get(format_options, "", t, AV_DICT_IGNORE_SUFFIX)) != nullptr)
+ {
+ if (!unsupported_tokens.empty())
+ unsupported_tokens += ", ";
+ unsupported_tokens += t->key;
+ }
+ avformat_close_input(&weak_context);
+ BOOST_THROW_EXCEPTION(ffmpeg_error() << msg_info(unsupported_tokens));
+ }
+ av_dict_free(&format_options);
+ }
+ break;
+ case FFMPEG_Resource::FFMPEG_STREAM:
+ {
+ AVDictionary* format_options = NULL;
+ for (auto& option : vid_params)
+ {
+ av_dict_set(&format_options, option.first.c_str(), option.second.c_str(), 0);
+ }
+ THROW_ON_ERROR2(avformat_open_input(&weak_context, u8(resource_name).c_str(), nullptr, &format_options), resource_name);
+ if (format_options != nullptr)
+ {
+ std::string unsupported_tokens = "";
+ AVDictionaryEntry *t = NULL;
+ while ((t = av_dict_get(format_options, "", t, AV_DICT_IGNORE_SUFFIX)) != nullptr)
+ {
+ if (!unsupported_tokens.empty())
+ unsupported_tokens += ", ";
+ unsupported_tokens += t->key;
+ }
+ avformat_close_input(&weak_context);
+ BOOST_THROW_EXCEPTION(ffmpeg_error() << msg_info(unsupported_tokens));
+ }
+ av_dict_free(&format_options);
+ }
+ break;
+ };
+ spl::shared_ptr<AVFormatContext> context(weak_context, [](AVFormatContext* p)
+ {
+ avformat_close_input(&p);
+ });
+ THROW_ON_ERROR2(avformat_find_stream_info(weak_context, nullptr), resource_name);
+ fix_meta_data(*context);
+ return context;