From acd797d780348b67d572cee0d84d1df0bf3df90c Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Thu, 30 May 2019 16:59:30 +0200
Subject: [PATCH] add device.api property

---
 spa/plugins/alsa/alsa-sink.c   | 1 +
 spa/plugins/alsa/alsa-source.c | 1 +
 spa/plugins/v4l2/v4l2-source.c | 1 +
 src/pipewire/keys.h            | 2 ++
 4 files changed, 5 insertions(+)

diff --git a/spa/plugins/alsa/alsa-sink.c b/spa/plugins/alsa/alsa-sink.c
index f05c00084..e6c69eb3a 100644
--- a/spa/plugins/alsa/alsa-sink.c
+++ b/spa/plugins/alsa/alsa-sink.c
@@ -226,6 +226,7 @@ static int impl_node_send_command(void *object, const struct spa_command *comman
 }
 
 static const struct spa_dict_item node_info_items[] = {
+	{ "device.api", "alsa" },
 	{ "media.class", "Audio/Sink" },
 	{ "node.driver", "true" },
 };
diff --git a/spa/plugins/alsa/alsa-source.c b/spa/plugins/alsa/alsa-source.c
index 9f8321ca3..47261edfb 100644
--- a/spa/plugins/alsa/alsa-source.c
+++ b/spa/plugins/alsa/alsa-source.c
@@ -226,6 +226,7 @@ static int impl_node_send_command(void *object, const struct spa_command *comman
 }
 
 static const struct spa_dict_item node_info_items[] = {
+	{ "device.api", "alsa" },
 	{ "media.class", "Audio/Source" },
 	{ "node.driver", "true" },
 };
diff --git a/spa/plugins/v4l2/v4l2-source.c b/spa/plugins/v4l2/v4l2-source.c
index 6433d4e17..a3eb791e4 100644
--- a/spa/plugins/v4l2/v4l2-source.c
+++ b/spa/plugins/v4l2/v4l2-source.c
@@ -315,6 +315,7 @@ static int impl_node_send_command(void *object, const struct spa_command *comman
 }
 
 static const struct spa_dict_item info_items[] = {
+	{ "device.api", "v4l2" },
 	{ "media.class", "Video/Source" },
 	{ "media.role", "Camera" },
 	{ "node.pause-on-idle", "false" },
diff --git a/src/pipewire/keys.h b/src/pipewire/keys.h
index 5db71af98..b0750761c 100644
--- a/src/pipewire/keys.h
+++ b/src/pipewire/keys.h
@@ -35,6 +35,8 @@ extern "C" {
  * Keys that start with "pipewire." are in general set-once and then
  * read-only. They are usually used for security sensitive information that
  * needs to be fixed.
+ *
+ * Properties from the parent can also appear on children.
  */
 
 /* Peroperties usually set on the core object */