From a717c7ada811411e31bd7308168b4dbee5b956fa Mon Sep 17 00:00:00 2001
From: Robert Mader <robert.mader@collabora.com>
Date: Wed, 6 Sep 2023 11:57:00 +0200
Subject: [PATCH] Video Capture PipeWire: Filter out non-camera nodes
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This can be helpful in various situations, such as debugging with an
unrestricted Pipewire socket or for downstream projects like
B2G/Capyloon. Additionally it will help once we move from the camera
portal to the more generic device portal.

Original patch by Fabrice Desré <fabrice@desre.org>

Bug: webrtc:15464
Change-Id: Iae6802f242d68244bca85947cb15ef3eee923ab0
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/318642
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#40706}
---
 AUTHORS                                         | 1 +
 modules/video_capture/linux/pipewire_session.cc | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/AUTHORS b/AUTHORS
index eb393ef057..f4b6f8d65c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -104,6 +104,7 @@ Raman Budny <budnyjj@gmail.com>
 Ramprakash Jelari <ennajelari@gmail.com>
 Riku Voipio <riku.voipio@linaro.org>
 Robert Bares <robert@bares.me>
+Robert Mader <robert.mader@collabora.com>
 Robert Mader <robert.mader@posteo.de>
 Robert Nagy <robert.nagy@gmail.com>
 Ryan Yoakum <ryoakum@skobalt.com>
diff --git a/modules/video_capture/linux/pipewire_session.cc b/modules/video_capture/linux/pipewire_session.cc
index 3f52b3dd61..4d1b200aca 100644
--- a/modules/video_capture/linux/pipewire_session.cc
+++ b/modules/video_capture/linux/pipewire_session.cc
@@ -360,6 +360,10 @@ void PipeWireSession::OnRegistryGlobal(void* data,
   if (!spa_dict_lookup(props, PW_KEY_NODE_DESCRIPTION))
     return;
 
+  auto node_role = spa_dict_lookup(props, PW_KEY_MEDIA_ROLE);
+  if (!node_role || strcmp(node_role, "Camera"))
+    return;
+
   that->nodes_.emplace_back(that, id, props);
   that->PipeWireSync();
 }