diff options
author | betaboon <betaboon@0x80.ninja> | 2023-04-08 15:06:22 +0200 |
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committer | betaboon <betaboon@0x80.ninja> | 2023-04-09 00:41:45 +0200 |
commit | dd33a7a9b9a926eca452e1f19e2945f6a59ecbc8 (patch) | |
tree | 3eb6867ef44fe1eb774799f52e4b233fd6ac2697 /nixos/modules/services/video | |
parent | 615c0d9b220326405fe4fccd827f0c2495041c7c (diff) |
nixos/v4l2-relayd: init
Diffstat (limited to 'nixos/modules/services/video')
-rw-r--r-- | nixos/modules/services/video/v4l2-relayd.nix | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/nixos/modules/services/video/v4l2-relayd.nix b/nixos/modules/services/video/v4l2-relayd.nix new file mode 100644 index 000000000000..2a9dbe00158f --- /dev/null +++ b/nixos/modules/services/video/v4l2-relayd.nix @@ -0,0 +1,199 @@ +{ config, lib, pkgs, utils, ... }: +let + + inherit (lib) attrValues concatStringsSep filterAttrs length listToAttrs literalExpression + makeSearchPathOutput mkEnableOption mkIf mkOption nameValuePair optionals types; + inherit (utils) escapeSystemdPath; + + cfg = config.services.v4l2-relayd; + + kernelPackages = config.boot.kernelPackages; + + gst = (with pkgs.gst_all_1; [ + gst-plugins-bad + gst-plugins-base + gst-plugins-good + gstreamer.out + ]); + + instanceOpts = { name, ... }: { + options = { + enable = mkEnableOption (lib.mdDoc "this v4l2-relayd instance"); + + name = mkOption { + type = types.str; + default = name; + description = lib.mdDoc '' + The name of the instance. + ''; + }; + + cardLabel = mkOption { + type = types.str; + description = lib.mdDoc '' + The name the camera will show up as. + ''; + }; + + extraPackages = mkOption { + type = with types; listOf package; + default = [ ]; + description = lib.mdDoc '' + Extra packages to add to {env}`GST_PLUGIN_PATH` for the instance. + ''; + }; + + input = { + pipeline = mkOption { + type = types.str; + description = lib.mdDoc '' + The gstreamer-pipeline to use for the input-stream. + ''; + }; + + format = mkOption { + type = types.str; + default = "YUY2"; + description = lib.mdDoc '' + The video-format to read from input-stream. + ''; + }; + + width = mkOption { + type = types.ints.positive; + default = 1280; + description = lib.mdDoc '' + The width to read from input-stream. + ''; + }; + + height = mkOption { + type = types.ints.positive; + default = 720; + description = lib.mdDoc '' + The height to read from input-stream. + ''; + }; + + framerate = mkOption { + type = types.ints.positive; + default = 30; + description = lib.mdDoc '' + The framerate to read from input-stream. + ''; + }; + }; + + output = { + format = mkOption { + type = types.str; + default = "YUY2"; + description = lib.mdDoc '' + The video-format to write to output-stream. + ''; + }; + }; + + }; + }; + +in +{ + + options.services.v4l2-relayd = { + + instances = mkOption { + type = with types; attrsOf (submodule instanceOpts); + default = { }; + example = literalExpression '' + { + example = { + cardLabel = "Example card"; + input.pipeline = "videotestsrc"; + }; + } + ''; + description = lib.mdDoc '' + v4l2-relayd instances to be created. + ''; + }; + + }; + + config = + let + + mkInstanceService = instance: { + description = "Streaming relay for v4l2loopback using GStreamer"; + + after = [ "modprobe@v4l2loopback.service" "systemd-logind.service" ]; + wantedBy = [ "multi-user.target" ]; + + serviceConfig = { + Type = "simple"; + Restart = "always"; + PrivateNetwork = true; + PrivateTmp = true; + LimitNPROC = 1; + }; + + environment = { + GST_PLUGIN_PATH = makeSearchPathOutput "lib" "lib/gstreamer-1.0" (gst ++ instance.extraPackages); + V4L2_DEVICE_FILE = "/run/v4l2-relayd-${instance.name}/device"; + }; + + script = + let + appsrcOptions = concatStringsSep "," [ + "caps=video/x-raw" + "format=${instance.input.format}" + "width=${toString instance.input.width}" + "height=${toString instance.input.height}" + "framerate=${toString instance.input.framerate}/1" + ]; + + outputPipeline = [ + "appsrc name=appsrc ${appsrcOptions}" + "videoconvert" + ] ++ optionals (instance.input.format != instance.output.format) [ + "video/x-raw,format=${instance.output.format}" + "queue" + ] ++ [ "v4l2sink name=v4l2sink device=$(cat $V4L2_DEVICE_FILE)" ]; + in + '' + exec ${pkgs.v4l2-relayd}/bin/v4l2-relayd -i "${instance.input.pipeline}" -o "${concatStringsSep " ! " outputPipeline}" + ''; + + preStart = '' + mkdir -p $(dirname $V4L2_DEVICE_FILE) + ${kernelPackages.v4l2loopback.bin}/bin/v4l2loopback-ctl add -x 1 -n "${instance.cardLabel}" > $V4L2_DEVICE_FILE + ''; + + postStop = '' + ${kernelPackages.v4l2loopback.bin}/bin/v4l2loopback-ctl delete $(cat $V4L2_DEVICE_FILE) + rm -rf $(dirname $V4L2_DEVICE_FILE) + ''; + }; + + mkInstanceServices = instances: listToAttrs (map + (instance: + nameValuePair "v4l2-relayd-${escapeSystemdPath instance.name}" (mkInstanceService instance) + ) + instances); + + enabledInstances = attrValues (filterAttrs (n: v: v.enable) cfg.instances); + + in + { + + boot = mkIf ((length enabledInstances) > 0) { + extraModulePackages = [ kernelPackages.v4l2loopback ]; + kernelModules = [ "v4l2loopback" ]; + }; + + systemd.services = mkInstanceServices enabledInstances; + + }; + + meta.maintainers = with lib.maintainers; [ betaboon ]; +} |