/// <summary>
/// 下载M3U8视频的头数据（Key 和 Map）（如果存在）
/// </summary>
/// <param name="head"></param>
/// <param name="savedir"></param>
public static bool DownloadM3U8Head(M3U8Head head, string savedir)
{
using (var client = new WebClient())
{
try
{
if (head.IsEncrypt)
{
var kuri = new Uri(head.KeyUrl);
var kfile = kuri.LocalPath.Substring(kuri.LocalPath.LastIndexOf('/') + 1);
var keyfile = Path.Combine(savedir, kfile);
head.Key = client.DownloadData(head.KeyUrl);
File.WriteAllBytes(keyfile, head.Key);
head.KeyFile = keyfile;
}
if (head.HasMap)
{
var mapurl = new Uri(head.MapUrl);
var filename = mapurl.LocalPath.Substring(mapurl.LocalPath.LastIndexOf('/'));
var savefile = Path.Combine(savedir, filename);
client.DownloadFile(head.MapUrl, savefile);
head.MapFile = savefile;
}
return(true);
}
catch
{
return(false);
}
}
}
public M3U8File(Uri url, M3U8Head head, ICollection <M3U8Segment> nodes)
{
RESOLUTION = "";
Head = head;
_nodes = new List <M3U8Segment>(nodes);
SourceUrl = url;
Name = SourceUrl.LocalPath.Substring(SourceUrl.LocalPath.LastIndexOf('/') + 1);
TotalSeconds = _nodes.Sum(p => p.Seconds);
TotalTime = TimeSpan.FromSeconds(TotalSeconds);
}
public static M3U8Head AnalyzeM3U8Head(Uri urlfix, string content)
{
if (content.StartsWith("#EXTM3U"))
{
var head = new M3U8Head();
var strs = content.Split('\n');
foreach (var str in strs)
{
if (str.StartsWith("#EXTINF:"))
{
break;
}
if (str.StartsWith("#EXT-X-VERSION:"))
{
head.VERSION = str.Substring(15);
}
else if (str.StartsWith("#EXT-X-TARGETDURATION:"))
{
var durstr = str.Substring(22);
if (double.TryParse(durstr, out var dr))
{
head.TARGETDURATION = dr;
}
}
else if (str.StartsWith("#EXT-X-MEDIA-SEQUENCE:"))
{
var seqstr = str.Substring(22);
if (int.TryParse(seqstr, out var seq))
{
head.MEDIA_SEQUENCE = seq;
}
}
else if (str.StartsWith("#EXT-X-MAP:"))
{
head.HasMap = true;
var strr = str.Substring(11);
var init = strr.Substring(4);//Trim URI=
var map = init.Trim('\"');
if (map.Contains("://"))
{
head.MapUrl = map;
}
else if (map.StartsWith("/"))
{
head.MapUrl = urlfix.Scheme + "://" + urlfix.Authority + map;
}
else
{
head.MapUrl = urlfix + map;
}
}
else if (str.StartsWith("#EXT-X-KEY:"))
{
var strr = str.Substring(11);
var kvs = strr.Split(',');
foreach (var nvs in kvs)
{
var nv = nvs.Split('=');
if (nv[0] == "METHOD")
{
head.IsEncrypt = true;
head.EncryptMethod = nv[1];
}
else if (nv[0] == "URI")
{
var k = nv[1].Trim('\"');
if (k.Contains(":"))
{
head.KeyUrl = k;
}
else if (k.StartsWith("/"))
{
head.KeyUrl = urlfix.Scheme + "://" + urlfix.Authority + k;
}
else
{
head.KeyUrl = urlfix + k;
}
}
else if (nv[0] == "IV")
{
head.IV = nv[1];
}
}
}
}
return(head);
}
return(null);
}
