added support for mulitple feeds

maskiner/laptop/configuration.nix

@@ -28,11 +28,20 @@ in
 
   webcam-rtsp = {
     enable = true;
-    # device = "/dev/v4l/by-id/usb-GENERAL_GENERAL_WEBCAM-video-index0";
-    device = "/dev/v4l/by-id/usb-Generic_HD_WebCam_200901010001-video-index0";
-    rtspUrl = "rtsp://192.168.1.143:8554/laptop";
-    framerate = 30;
-    videoSize = "1280x720";
+    streams = {
+      frontcam = {
+        device = "/dev/v4l/by-id/usb-Generic_HD_WebCam_200901010001-video-index0";
+        rtspUrl = "rtsp://192.168.1.143:8554/frontcam";
+        framerate = 15;
+        videoSize = "1280x720";
+      };
+      webcam = {
+        device = "/dev/v4l/by-id/usb-GENERAL_GENERAL_WEBCAM-video-index0";
+        rtspUrl = "rtsp://192.168.1.143:8554/webcam";
+        framerate = 15;
+        videoSize = "1280x720";
+      };
+    };
   };
 
   security.sudo.wheelNeedsPassword = false;

moduler/services/webcam-rtsp/default.nix

@@ -5,6 +5,24 @@
   ...
 }:
 with lib;
+let
+  cfg = config.webcam-rtsp;
+
+  effectiveStreams =
+    if cfg.streams != { } then
+      cfg.streams
+    else
+      {
+        main = {
+          device = cfg.device;
+          rtspUrl = cfg.rtspUrl;
+          framerate = cfg.framerate;
+          videoSize = cfg.videoSize;
+        };
+      };
+
+  sanitizeName = name: replaceStrings [ "/" " " ] [ "-" "-" ] name;
+in
 {
   options = {
     webcam-rtsp = {
@@ -29,29 +47,60 @@ with lib;
         default = "1280x720";
         description = "Input video size for the webcam stream.";
       };
-    };
-  };
-
-  config = mkIf config.webcam-rtsp.enable {
-    systemd.services.webcam-rtsp-publisher = {
-      description = "Publish USB webcam to MediaMTX over RTSP";
-      wantedBy = [ "multi-user.target" ];
-      after = [ "network-online.target" ];
-      wants = [ "network-online.target" ];
-
-      serviceConfig = {
-        Type = "simple";
-        Restart = "always";
-        RestartSec = "2";
-        ExecStart = ''
-          ${pkgs.ffmpeg}/bin/ffmpeg \
-            -hide_banner -loglevel warning \
-            -f v4l2 -framerate ${toString config.webcam-rtsp.framerate} -video_size ${config.webcam-rtsp.videoSize} \
-            -i ${config.webcam-rtsp.device} \
-            -vcodec libx264 -tune zerolatency -preset veryfast \
-            -f rtsp ${config.webcam-rtsp.rtspUrl}
-        '';
+      streams = mkOption {
+        type = types.attrsOf (
+          types.submodule {
+            options = {
+              device = mkOption {
+                type = types.str;
+                description = "V4L2 device used as input for ffmpeg.";
+              };
+              rtspUrl = mkOption {
+                type = types.str;
+                description = "Destination RTSP URL where ffmpeg publishes the stream.";
+              };
+              framerate = mkOption {
+                type = types.int;
+                default = 30;
+                description = "Input framerate for this stream.";
+              };
+              videoSize = mkOption {
+                type = types.str;
+                default = "1280x720";
+                description = "Input video size for this stream.";
+              };
+            };
+          }
+        );
+        default = { };
+        description = "Named stream definitions. One systemd service is created per stream.";
       };
     };
   };
+
+  config = mkIf cfg.enable {
+    systemd.services = mapAttrs' (
+      streamName: streamCfg:
+      nameValuePair "webcam-rtsp-publisher-${sanitizeName streamName}" {
+        description = "Publish webcam stream '${streamName}' to MediaMTX over RTSP";
+        wantedBy = [ "multi-user.target" ];
+        after = [ "network-online.target" ];
+        wants = [ "network-online.target" ];
+
+        serviceConfig = {
+          Type = "simple";
+          Restart = "always";
+          RestartSec = "2";
+          ExecStart = ''
+            ${pkgs.ffmpeg}/bin/ffmpeg \
+              -hide_banner -loglevel warning \
+              -f v4l2 -framerate ${toString streamCfg.framerate} -video_size ${streamCfg.videoSize} \
+              -i ${streamCfg.device} \
+              -vcodec libx264 -tune zerolatency -preset veryfast \
+              -f rtsp ${streamCfg.rtspUrl}
+          '';
+        };
+      }
+    ) effectiveStreams;
+  };
 }