From 459844e80ef143b9d6b53b42ac7e1bda929c7cf3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Eero=20H=C3=A4kkinen?= <eero.hakkinen@intel.com>
Date: Tue, 18 Aug 2020 22:47:47 +0300
Subject: [PATCH] Clarify pan/tilt/zoom capabilities (#245)

---
 index.bs | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/index.bs b/index.bs
index 4f9ac49..f10cbb2 100644
--- a/index.bs
+++ b/index.bs
@@ -493,7 +493,10 @@ This Section defines a number of new set of <a>Constrainable Properties</a> for
   <dd>This reflects the supported range of <a>contrast</a>. Values are numeric.  Increasing values indicate increasing contrast.</dd>
 
   <dt><dfn dict-member for="MediaTrackCapabilities"><code>pan</code></dfn></dt>
-  <dd>This reflects the <a>pan</a> value range supported by the UA.</dd>
+  <dd>This reflects the <a>pan</a> value range supported by the UA and by the track.
+
+  If the track has been created without <a>requesting permission to use</a> (as defined in [[!permissions]]) a PermissionDescriptor with its name member set to {{PermissionName/camera}} and its {{CameraDevicePermissionDescriptor/panTiltZoom}} member set to true or if that permission request is denied, the track does not support <a>pan</a>.
+  In that case the UA MUST NOT expose the <a>pan</a> value range.</dd>
 
   <dt><dfn dict-member for="MediaTrackCapabilities"><code>saturation</code></dfn></dt>
   <dd>This reflects the permitted range of <a>saturation</a> setting. Values are numeric. Increasing values indicate increasing saturation.</dd>
@@ -505,10 +508,16 @@ This Section defines a number of new set of <a>Constrainable Properties</a> for
   <dd>This reflects the <a>focus distance</a> value range supported by the UA.</dd>
 
   <dt><dfn dict-member for="MediaTrackCapabilities"><code>tilt</code></dfn></dt>
-  <dd>This reflects the <a>tilt</a> value range supported by the UA.</dd>
+  <dd>This reflects the <a>tilt</a> value range supported by the UA and by the track.
+
+  If the track has been created without <a>requesting permission to use</a> (as defined in [[!permissions]]) a PermissionDescriptor with its name member set to {{PermissionName/camera}} and its {{CameraDevicePermissionDescriptor/panTiltZoom}} member set to true or if that permission request is denied, the track does not support <a>tilt</a>.
+  In that case the UA MUST NOT expose the <a>tilt</a> value range.</dd>
 
   <dt><dfn dict-member for="MediaTrackCapabilities"><code>zoom</code></dfn></dt>
-  <dd>This reflects the <a>zoom</a> value range supported by the UA.</dd>
+  <dd>This reflects the <a>zoom</a> value range supported by the UA by the track.
+
+  If the track has been created without <a>requesting permission to use</a> (as defined in [[!permissions]]) a PermissionDescriptor with its name member set to {{PermissionName/camera}} and its {{CameraDevicePermissionDescriptor/panTiltZoom}} member set to true or if that permission request is denied, the track does not support <a>zoom</a>.
+  In that case the UA MUST NOT expose the <a>zoom</a> value range.</dd>
 
   <dt><dfn dict-member for="MediaTrackCapabilities"><code>torch</code></dfn></dt>
   <dd>A boolean indicating whether camera supports <a>torch</a>  mode- on meaning supported.</dd>