From 6ea1d866494e4b12b557e7433716f25176e5951b Mon Sep 17 00:00:00 2001
From: Philipp Hancke <phancke@microsoft.com>
Date: Wed, 28 Sep 2022 14:47:58 +0200
Subject: [PATCH 1/3] audio: add rtp sequence number on incoming frames

where it is easily available.
---
 index.bs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/index.bs b/index.bs
index 75dea47..7db3c8f 100644
--- a/index.bs
+++ b/index.bs
@@ -434,6 +434,7 @@ dictionary RTCEncodedAudioFrameMetadata {
     unsigned long synchronizationSource;
     octet payloadType;
     sequence&lt;unsigned long&gt; contributingSources;
+    short? sequenceNumber; // RTP sequence number on incoming frames.
 };
 </pre>
 ### Members ### {#RTCEncodedAudioFrameMetadata-members}

From b4916b8bbaea0781e0f0613119317391c22316b1 Mon Sep 17 00:00:00 2001
From: Philipp Hancke <phancke@microsoft.com>
Date: Tue, 25 Oct 2022 08:52:57 +0200
Subject: [PATCH 2/3] describe and make non-optional

---
 index.bs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/index.bs b/index.bs
index 7db3c8f..4f48f81 100644
--- a/index.bs
+++ b/index.bs
@@ -434,7 +434,7 @@ dictionary RTCEncodedAudioFrameMetadata {
     unsigned long synchronizationSource;
     octet payloadType;
     sequence&lt;unsigned long&gt; contributingSources;
-    short? sequenceNumber; // RTP sequence number on incoming frames.
+    short sequenceNumber;
 };
 </pre>
 ### Members ### {#RTCEncodedAudioFrameMetadata-members}
@@ -468,6 +468,15 @@ dictionary RTCEncodedAudioFrameMetadata {
             The list of contribution sources (csrc list) as defined in [[RFC3550]].
         </p>
     </dd>
+    <dt>
+        <dfn>sequenceNumber</dfn> of type <span class=
+            "idlMemberType">short</span>
+    </dt>
+    <dd>
+        <p>
+            The RTP sequence number as defined in [[RFC3550]]. Only exists for incoming audio frames.
+        </p>
+    </dd>
 </dl>
 
 ## <dfn>RTCEncodedAudioFrame</dfn> interface ## {#RTCEncodedAudioFrame-interface}

From ecc99cef97e576287948c7f0a3514ade50a3aef0 Mon Sep 17 00:00:00 2001
From: Philipp Hancke <phancke@microsoft.com>
Date: Mon, 16 Jan 2023 12:17:48 +0100
Subject: [PATCH 3/3] add reference for serial number arithmetic

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

diff --git a/index.bs b/index.bs
index 4f48f81..0b2e102 100644
--- a/index.bs
+++ b/index.bs
@@ -476,6 +476,9 @@ dictionary RTCEncodedAudioFrameMetadata {
         <p>
             The RTP sequence number as defined in [[RFC3550]]. Only exists for incoming audio frames.
         </p>
+        <p class="note">
+            Comparing two sequence numbers requires serial number arithmetic described in [[RFC1982]].
+        </p>
     </dd>
 </dl>