F Added readme, added SDP file, improved configuration, added comments

Author: jimm98y

README.md

@@ -7,6 +7,9 @@ Simple RTSP client that supports H264, H265 for video and AAC for audio.
 ## SharpRTSPServer
 Simple RTSP server that supports H264, H265 for video and AAC, PCMU and PCMA for audio. 
 
+## FFmpeg RTSP Server
+Sample RTSP server for ffmpeg RTP streams. Fully configurable in appsettings.json.
+
 ## Remarks
 Still work in progress, APIs are subject to change.
 

src/RTSPServerFFmpeg/Program.cs

@@ -2,6 +2,7 @@
 using SharpRTSPServer;
 using System;
 using System.Diagnostics;
+using System.IO;
 using System.Text;
 using System.Threading;
 
@@ -11,37 +12,59 @@
 string userName = config["UserName"];
 string password = config["Password"];
 
-string ffmpegPath = config["FFmpegPath"];
-string ffmpegArgs = config["FFmpegArgs"];
-string videoUri = config["VideoUri"];
-string audioUri = config["AudioUri"];
+string ffmpegPath = config["FFmpegPath"]; // path to ffmpeg.exe
+string ffmpegArgs = config["FFmpegArgs"]; // Arguments that will be passed to the ffmpeg process
+string videoUri = config["VideoUri"]; // RTP video URI
+string audioUri = config["AudioUri"]; // RTP audio URI
+string sdpFile = config["SDPFile"]; // SDP file path (Optional in case ffmpegPath and ffmpegArgs are not specified. You have to launch ffmpeg before starting the server.)
 
-// ffmpeg.exe -re -stream_loop -1 -i frag_bunny.mp4 -vcodec copy -an -f rtp rtp://127.0.0.1:11111 -vn -acodec copy -f rtp rtp://127.0.0.1:11113
+SemaphoreSlim semaphore = new SemaphoreSlim(0);
+StringBuilder sdpBuilder = new StringBuilder();
 ProcessStartInfo info = new ProcessStartInfo();
-info.FileName = ffmpegPath;
-info.Arguments = ffmpegArgs;
-info.RedirectStandardOutput = true;
-info.UseShellExecute = false;
-
+Process process = null;
 string lastLine = null;
-SemaphoreSlim semaphore = new SemaphoreSlim(0);
-StringBuilder sdp = new StringBuilder();
-var process = Process.Start(info);
-process.OutputDataReceived += Process_OutputDataReceived;
-process.BeginOutputReadLine();
+string sdp = null;
+
+if (!string.IsNullOrEmpty(ffmpegPath) && !string.IsNullOrEmpty(ffmpegArgs))
+{
+    // launch ffmpeg, parse the output and start streaming
+    // ffmpeg.exe -re -stream_loop -1 -i frag_bunny.mp4 -vcodec copy -an -f rtp rtp://127.0.0.1:11111 -vn -acodec copy -f rtp rtp://127.0.0.1:11113
+    info.FileName = ffmpegPath;
+    info.Arguments = ffmpegArgs;
+    info.RedirectStandardOutput = true;
+    info.UseShellExecute = false;
+
+    process = Process.Start(info);
+    process.OutputDataReceived += Process_OutputDataReceived;
+    process.BeginOutputReadLine();
 
-// wait until the SDP is read
-semaphore.Wait();
+    // wait until the SDP is read
+    semaphore.Wait();
+
+    sdp = sdpBuilder.ToString();
+}
+else if(!string.IsNullOrEmpty(sdpFile))
+{
+    // optionally, read SDP from a file
+    sdp = File.ReadAllText(sdpFile);
+}
+else
+{
+    throw new Exception("Invalid configuration! Either ffmpegPath and ffmpegArgs, or SDPFile must be specified!");
+}
+
+if (string.IsNullOrEmpty(videoUri) && string.IsNullOrEmpty(audioUri))
+    throw new Exception("Invalid configuration! Either VideoUri, AudioUri or both must be specified!");
 
 using (var server = new RTSPServer(port, userName, password))
 {
     if (!string.IsNullOrEmpty(videoUri))
-        server.AddVideoTrack(new ProxyTrack(0, videoUri));
+        server.AddVideoTrack(new ProxyTrack(ProxyTrackType.Video, videoUri));
 
     if (!string.IsNullOrEmpty(audioUri))
-        server.AddAudioTrack(new ProxyTrack(1, audioUri));
+        server.AddAudioTrack(new ProxyTrack(ProxyTrackType.Audio, audioUri));
 
-    server.OverrideSDP(sdp.ToString(), true);
+    server.OverrideSDP(sdp, true);
 
     try
     {
@@ -57,10 +80,13 @@
     Console.WriteLine("Press any key to exit");
     while (!Console.KeyAvailable)
     {
-        System.Threading.Thread.Sleep(250); 
+        Thread.Sleep(250); 
     }
 
-    process.Kill();
+    if (process != null)
+    {
+        process.Kill();
+    }
 }
 
 void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
@@ -75,6 +101,6 @@ void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
 
     if (!string.IsNullOrEmpty(e.Data) && !e.Data.StartsWith("SDP:"))
     {
-        sdp.AppendLine(e.Data);
+        sdpBuilder.AppendLine(e.Data);
     }
 }

src/RTSPServerFFmpeg/appsettings.json

@@ -6,5 +6,6 @@
   "FFmpegPath": "C:\\Users\\lukas\\Downloads\\ffmpeg-6.0-full_build\\bin\\ffmpeg.exe",
   "FFmpegArgs": "-re -stream_loop -1 -i C:\\Git\\SharpMediaCoder\\src\\SharpMediaPlayer\\frag_bunny.mp4 -vcodec copy -an -f rtp rtp://127.0.0.1:11111 -vn -acodec copy -f rtp rtp://127.0.0.1:11113",
   "VideoUri": "rtp://127.0.0.1:11111",
-  "AudioUri": "rtp://127.0.0.1:11113"
+  "AudioUri": "rtp://127.0.0.1:11113",
+  "SDPFile": null
 }

src/SharpRTSPServer/ProxyTrack.cs

@@ -9,6 +9,12 @@
 
 namespace SharpRTSPServer
 {
+    public enum ProxyTrackType : int
+    {
+        Video = 0, 
+        Audio = 1
+    }
+
     public class ProxyTrack : TrackBase
     {
         public override string Codec => "PROXY";
@@ -27,9 +33,9 @@ public override bool IsReady
 
         public Uri Uri { get; }
 
-        public ProxyTrack(int id, string uri)
+        public ProxyTrack(ProxyTrackType type, string uri)
         {
-            this.ID = id;
+            this.ID = (int)type;
             this.Uri = new Uri(uri, UriKind.Absolute);
             Connect(this.Uri);
         }

src/SharpRTSPServer/SharpRTSPServer.csproj

@@ -13,7 +13,7 @@
 		<AllowUnsafeBlocks>True</AllowUnsafeBlocks>
 		<Nullable>disable</Nullable>
 		<Title>$(ProjectName)</Title>
-		<Version>0.0.1</Version>
+		<Version>0.0.2</Version>
 		<Authors>Lukas Volf</Authors>
 		<Copyright>MIT</Copyright>
 		<PackageProjectUrl>https://github.com/jimm98y/SharpRealTimeStreaming</PackageProjectUrl>