主m3u8文件中具有高带宽的正则表达式匹配分辨率

如何解决主m3u8文件中具有高带宽的正则表达式匹配分辨率

我在匹配m3u8主文件的最高带宽方面遇到了一些问题

这是master.m3u8的内容

#EXTM3U
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=149000,RESOLUTION=320x180,CODECS="avc1.66.30,mp4a.40.2",CLOSED-CAPTIONS=NONE
https://testurl 1
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=300000,CLOSED-CAPTIONS=NONE
https://testurl 2
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=500000,RESOLUTION=640x360,CLOSED-CAPTIONS=NONE
https://testurl 3
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=800000,CLOSED-CAPTIONS=NONE
https://testurl 4
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1000000,RESOLUTION=1280x720,CODECS="avc1.77.30,CLOSED-CAPTIONS=NONE
https://testurl 5
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1299000,CLOSED-CAPTIONS=NONE
https://testurl 6
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=1499000,CLOSED-CAPTIONS=NONE
https://testurl 7
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=62000,CODECS="mp4a.40.2",CLOSED-CAPTIONS=NONE
https://testurl 8

我可以通过解析获取网址。但是问题是某些主m3u8具有三个具有相同分辨率但带宽不同的URL。

我的目标是，如果我选择1280x720，并且会有多个具有相同分辨率的结果，那么我只想像示例内容中那样获得带宽最高的URL。最高是1499000

这是我当前的代码。

private static void TEST()
{
var f = File.ReadAllText(@"C:\Users\MARK\Desktop\TEST\master.m3u8");
    
string result = string.Empty;
    
    result = ParseM3u8Master(f,"1280x720",2);
    if (result == "") {
        result = ParseM3u8Master(f,"640x360",2);
    }else if (result == ""){
        result = ParseM3u8Master(f,"320x180",2);
    }
    Console.WriteLine(result);
}

private const RegexOptions ML = RegexOptions.IgnoreCase | RegexOptions.Multiline;
public static string ParseM3u8Master(string m3u8Master,string resolution,int group)
{
    string result = string.Empty;
    string pattern = $@"(?:RESOLUTION=({resolution}).*?)\n(https.+|http[-a-zA-Z0-9()@:%_\+.~#?&//=])";
    if (Regex.IsMatch(m3u8Master,pattern,ML))
    {
        result = Regex.Match(m3u8Master,ML).Groups[group].Value;
    }
    return result;
}
 

解决方法

更新：（在尝试解决方案之后。我成功获得了总是在最后的最高带宽）

这是我的解决方案（也许您可以提出更好的建议）

private const RegexOptions ML = RegexOptions.IgnoreCase | RegexOptions.Multiline;
public static string ParseM3u8Master(string m3u8Master,string resolution,int group)
{
    string result = string.Empty;
    string pattern = $@"(?:RESOLUTION=({resolution}).*?)\n(https.+|http[-a-zA-Z0-9()@:%_\+.~#?&//=])";
    if (Regex.IsMatch(m3u8Master,pattern,ML))
    {
        var lst = new List<string>();
        var mc = Regex.Matches(m3u8Master,ML); 
        foreach (Match m in mc) {
            lst.Add(m.Groups[2].Value);
        }
        result = lst.Last();
    }
    return res
}