first running version

Controllers/PlayListController.cs

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+using System.IO;
+using System.Net.Http;
+using System.Text.RegularExpressions;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+
+namespace tv7playlist.Controllers
+{
+    [Route("api/playlist")]
+    [ApiController]
+    public class PlayListController : ControllerBase
+    {
+        private const string Tv7OriginUrl = "https://api.init7.net/tvchannels.m3u";
+        private const string UdpxyRootUrl = "http://tv1.haefelfinger.net:4022/udp";
+
+        private static readonly Regex MulticastRegex = new Regex(@"(udp\:\/\/@)([0-9.:]+)",
+            RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.IgnoreCase);
+
+        [HttpGet]
+        public async Task<FileStreamResult> Get()
+        {
+            var httpClient = new HttpClient();
+            var tv7Response = await httpClient.GetAsync(Tv7OriginUrl);
+
+
+            var outStream = new MemoryStream();
+            var outWriter = new StreamWriter(outStream);
+
+            using (var tv7ReadStream = await tv7Response.Content.ReadAsStreamAsync())
+            using (var reader = new StreamReader(tv7ReadStream))
+            {
+                while (!reader.EndOfStream)
+                {
+                    var line = await reader.ReadLineAsync();
+                    line = MulticastRegex.Replace(line, $"{UdpxyRootUrl}/$2/");
+                    outWriter.WriteLine(line);
+                }
+
+                await outWriter.FlushAsync();
+            }
+
+            outStream.Seek(0, SeekOrigin.Begin);
+            return new FileStreamResult(outStream, "audio/mpegurl") {FileDownloadName = "PlaylistTV7udpxy.m3u"};
+        }
+    }
+}