gentoo-overlay/media-video/wireplumber/files/wireplumber-0.4.2-v4l-add-basic-check-for-nil-monitor.patch

From 3b41df35a885b4db04528d839b87e88bf1345240 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nikl=C4=81vs=20Ko=C4=BCes=C5=86ikovs?=
 <89q1r14hd@relay.firefox.com>
Date: Wed, 15 Sep 2021 13:08:04 +0300
Subject: [PATCH 4/5] v4l: add basic check for nil monitor
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

If PipeWire is built without V4L support, then

`monitor = SpaDevice("api.v4l2.enum.udev", config.properties or {})`

will result in a nil monitor. This commit adds a basic sanity check
to avoid further using the nil variable.

Thanks-to: Pascal Flöschel (initial bug report)
Thanks-to: George Kiagiadakis <george.kiagiadakis@collabora.com>
Bug: https://bugs.gentoo.org/813043
---
 src/scripts/monitors/v4l2.lua | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/scripts/monitors/v4l2.lua b/src/scripts/monitors/v4l2.lua
index e698cd7..fd9a20d 100644
--- a/src/scripts/monitors/v4l2.lua
+++ b/src/scripts/monitors/v4l2.lua
@@ -131,5 +131,9 @@ function createDevice(parent, id, type, factory, properties)
 end
 
 monitor = SpaDevice("api.v4l2.enum.udev", config.properties or {})
-monitor:connect("create-object", createDevice)
-monitor:activate(Feature.SpaDevice.ENABLED)
+if monitor then
+  monitor:connect("create-object", createDevice)
+  monitor:activate(Feature.SpaDevice.ENABLED)
+else
+  Log.message("PipeWire's V4L SPA missing or broken. Video4Linux not supported.")
+end
-- 
2.33.0