From ca6942d3459e31d09dd004a40591c5a1359f2a9d Mon Sep 17 00:00:00 2001
From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Tue, 28 May 2024 17:39:50 -0700
Subject: [PATCH] Clarify meaning of spatialScalability
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WebRTC-SVC Section 7.1 includes text relating to discovery which belongs in the Media Capabilities specification.
 
Related: https://github.com/w3c/webrtc-svc/issues/103
---
 index.bs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/index.bs b/index.bs
index fc2e010..28cc95b 100644
--- a/index.bs
+++ b/index.bs
@@ -464,10 +464,12 @@ spec: encrypted-media-draft; for: EME; urlPrefix: https://w3c.github.io/encrypte
         member represents the ability to do spatial prediction, that is,
         using frames of a resolution different than the current resolution as
         dependencies. If absent, spatialScalability will default to
-        <code>false</code>. spatialScalability is closely coupled to
-        {{VideoConfiguration/scalabilityMode}} in the sense that streams encoded
-        with modes using spatial scalability (e.g. "L2T1") can only be decoded
-        if spatialScalability is supported. spatialScalability is only
+        <code>false</code>. If spatialScalability is set to <code>true</code>,
+        the decoder can decode any {{VideoConfiguration/scalabilityMode}} 
+        that the encoder can encode for the configured codec.  If spatialScalability
+        is set to <code>false</code>, the decoder cannot decode spatial scalability
+        modes, but can decode all other {{VideoConfiguration/scalabilityMode}} values
+        that the encoder can encode for the configured codec. spatialScalability is only
         applicable to {{MediaDecodingConfiguration}} for types {{media-source}},
         {{file}}, and {{MediaDecodingType/webrtc}}.
       </p>