private static IEnumerable<Uri> ExtractDownloadUrls(string source)
{
#if NETFX_CORE
string urlMap = new WwwFormUrlDecoder(source).GetFirstValueByName("url_encoded_fmt_stream_map");
#else
string urlMap = HttpUtility.ParseQueryString(source).Get("url_encoded_fmt_stream_map");
#endif
string[] splitByUrls = urlMap.Split(',');
foreach (string s in splitByUrls)
{
#if NETFX_CORE
var decoder = new WwwFormUrlDecoder(s);
string url = string.Format("{0}&fallback_host={1}&signature={2}",
decoder.GetFirstValueByName("url"),
decoder.GetFirstValueByName("fallback_host"),
decoder.GetFirstValueByName("sig"));
url = WebUtility.UrlDecode(url);
url = WebUtility.UrlDecode(url);
#else
var queries = HttpUtility.ParseQueryString(s);
string url = string.Format("{0}&fallback_host={1}&signature={2}", queries["url"], queries["fallback_host"], queries["sig"]);
url = HttpUtility.UrlDecode(url);
url = HttpUtility.UrlDecode(url);
#endif
yield return new Uri(url);
}
}
