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|
{
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 "this v4l2-relayd instance";
name = mkOption {
type = types.str;
default = name;
description = ''
The name of the instance.
'';
};
cardLabel = mkOption {
type = types.str;
description = ''
The name the camera will show up as.
'';
};
extraPackages = mkOption {
type = with types; listOf package;
default = [ ];
description = ''
Extra packages to add to {env}`GST_PLUGIN_PATH` for the instance.
'';
};
input = {
pipeline = mkOption {
type = types.str;
description = ''
The gstreamer-pipeline to use for the input-stream.
'';
};
format = mkOption {
type = types.str;
default = "YUY2";
description = ''
The video-format to read from input-stream.
'';
};
width = mkOption {
type = types.ints.positive;
default = 1280;
description = ''
The width to read from input-stream.
'';
};
height = mkOption {
type = types.ints.positive;
default = 720;
description = ''
The height to read from input-stream.
'';
};
framerate = mkOption {
type = types.ints.positive;
default = 30;
description = ''
The framerate to read from input-stream.
'';
};
};
output = {
format = mkOption {
type = types.str;
default = "YUY2";
description = ''
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 = ''
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" ];
# Prevent v4l2loopback from auto-creating a device at load time. An
# unconfigured device has a degenerate framerate range that breaks
# GStreamer caps negotiation. All devices are created at runtime via
# v4l2loopback-ctl add in each instance's preStart instead.
extraModprobeConfig = "options v4l2loopback devices=0";
};
systemd.services = mkInstanceServices enabledInstances;
};
meta.maintainers = with lib.maintainers; [ betaboon ];
}
|
