From 16ac35aaa9cddafba90abacea388ff409cbd1f2f Mon Sep 17 00:00:00 2001
From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Wed, 1 Mar 2023 15:44:10 -0800
Subject: [PATCH 1/2] Add EventHandler for Encoder/Decoder changes

Fixes https://github.com/w3c/webcodecs/issues/604

Work-in-progress, do not merge.
---
 index.src.html | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/index.src.html b/index.src.html
index da0fcc9c..baab2e55 100644
--- a/index.src.html
+++ b/index.src.html
@@ -262,6 +262,7 @@
   readonly attribute CodecState state;
   readonly attribute unsigned long decodeQueueSize;
   attribute EventHandler ondequeue;
+  attribute EventHandler onDecoderChange;
 
   undefined configure(AudioDecoderConfig config);
   undefined decode(EncodedAudioChunk chunk);
@@ -589,6 +590,7 @@
   readonly attribute CodecState state;
   readonly attribute unsigned long decodeQueueSize;
   attribute EventHandler ondequeue;
+  attribute EventHandler onDecoderChange;
 
   undefined configure(VideoDecoderConfig config);
   undefined decode(EncodedVideoChunk chunk);
@@ -943,6 +945,7 @@
   readonly attribute CodecState state;
   readonly attribute unsigned long encodeQueueSize;
   attribute EventHandler ondequeue;
+  attribute EventHandler onEncoderChange;
 
   undefined configure(AudioEncoderConfig config);
   undefined encode(AudioData data);
@@ -1316,6 +1319,7 @@
   readonly attribute CodecState state;
   readonly attribute unsigned long encodeQueueSize;
   attribute EventHandler ondequeue;
+  attribute EventHandler onEncoderChange;
 
   undefined configure(VideoEncoderConfig config);
   undefined encode(VideoFrame frame, optional VideoEncoderEncodeOptions options = {});

From 91ba3b2527fa61738b148d7ae43cf88a8fdd1dd6 Mon Sep 17 00:00:00 2001
From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Wed, 1 Mar 2023 15:52:55 -0800
Subject: [PATCH 2/2] Add EventHandler definitions

---
 index.src.html | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/index.src.html b/index.src.html
index baab2e55..94f6fffe 100644
--- a/index.src.html
+++ b/index.src.html
@@ -354,7 +354,10 @@
 : <dfn event for=AudioDecoder>dequeue</dfn>
 :: Fired at the {{AudioDecoder}} when the {{AudioDecoder/decodeQueueSize}} has
     decreased.
-
+    
+: <dfn event for=AudioDecoder>onDecoderChange</dfn>
+:: Fired at the {{AudioDecoder}} when the {{AudioDecoder/powerEfficient}} or
+    {{AudioDecoder/decoderId}} value changes.
 
 Methods {#audiodecoder-methods}
 -------------------------------
@@ -686,6 +689,10 @@
 : <dfn event for=VideoDecoder>dequeue</dfn>
 :: Fired at the {{VideoDecoder}} when the {{VideoDecoder/decodeQueueSize}} has
     decreased.
+    
+: <dfn event for=VideoDecoder>onDecoderChange</dfn>
+:: Fired at the {{VideoDecoder}} when the {{VideoDecoder/powerEfficient}} or
+    {{VideoDecoder/decoderId}} value changes.
 
 Methods {#videodecoder-methods}
 -------------------------------
@@ -1041,6 +1048,10 @@
 : <dfn event for=AudioEncoder>dequeue</dfn>
 :: Fired at the {{AudioEncoder}} when the {{AudioEncoder/encodeQueueSize}} has
     decreased.
+    
+: <dfn event for=AudioEncoder>onEncoderChange</dfn>
+:: Fired at the {{AudioEncoder}} when the {{AudioEncoder/powerEfficient}} or
+    {{AudioEncoder/decoderId}} value changes.
 
 Methods {#audioencoder-methods}
 -------------------------------
@@ -1415,6 +1426,10 @@
 : <dfn event for=VideoEncoder>dequeue</dfn>
 :: Fired at the {{VideoEncoder}} when the {{VideoEncoder/encodeQueueSize}} has
     decreased.
+    
+: <dfn event for=VideoEncoder>onEncoderChange</dfn>
+:: Fired at the {{VideoEncoder}} when the {{VideoEncoder/powerEfficient}} or
+    {{VideoEncoder/decoderId}} value changes.
 
 Methods {#videoencoder-methods}
 -------------------------------