From 8ebeb3a01f6764adc3c7a373c069c3a26ba5fe5b Mon Sep 17 00:00:00 2001
From: Jan-Ivar Bruaroey <jan-ivar@users.noreply.github.com>
Date: Fri, 15 Dec 2023 20:31:23 -0500
Subject: [PATCH 1/2] Shim RTCRtpScriptTransform.

---
 src/js/adapter_factory.js    |  1 +
 src/js/chrome/chrome_shim.js | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/src/js/adapter_factory.js b/src/js/adapter_factory.js
index 54bdda28..7ac2a71c 100644
--- a/src/js/adapter_factory.js
+++ b/src/js/adapter_factory.js
@@ -63,6 +63,7 @@ export function adapterFactory({window} = {}, options = {
       chromeShim.shimGetStats(window, browserDetails);
       chromeShim.shimSenderReceiverGetStats(window, browserDetails);
       chromeShim.fixNegotiationNeeded(window, browserDetails);
+      chromeShim.shimRTCRtpScriptTransform(window, browserDetails);
 
       commonShim.shimRTCIceCandidate(window, browserDetails);
       commonShim.shimRTCIceCandidateRelayProtocol(window, browserDetails);
diff --git a/src/js/chrome/chrome_shim.js b/src/js/chrome/chrome_shim.js
index 46aee7e2..9f0793c3 100644
--- a/src/js/chrome/chrome_shim.js
+++ b/src/js/chrome/chrome_shim.js
@@ -700,3 +700,37 @@ export function fixNegotiationNeeded(window, browserDetails) {
     return e;
   });
 }
+
+export function shimRTCRtpScriptTransform(window) {
+  if (!window.RTCRtpScriptTransform &&
+      !('transform' in window.RTCRtpSender.prototype) &&
+      !('transform' in window.RTCRtpReceiver.prototype)) {
+    window.RTCRtpScriptTransform = class RTCRtpScriptTransform {
+      constructor(worker, options, transfer) {
+        this._worker = worker;
+        this._options = options;
+        this._transfer = transfer;
+      }
+    };
+    const property = {
+      get() {
+        return this._transform || null;
+      },
+      set(transform) {
+        if (transform && !(transform instanceof window.RTCRtpScriptTransform)) {
+          throw new TypeError("expected window.RTCRtpScriptTransform");
+        }
+        this._transform = transform || null;
+        if (!transform) return;
+        const {readable, writable} = this.createEncodedStreams();
+        transform._worker.postMessage({
+          rtctransform: {
+            readable, writable, options: transform._options
+          }
+        }, [readable, writable, ...(transform._transfer || [])]);
+      }
+    };
+    Object.defineProperty(window.RTCRtpSender.prototype, 'transform', property);
+    Object.defineProperty(window.RTCRtpReceiver.prototype, 'transform', property);
+  }
+}

From 9f65fa61cb12672920c3a2eb417bdb43a19044a2 Mon Sep 17 00:00:00 2001
From: Jan-Ivar Bruaroey <jan-ivar@users.noreply.github.com>
Date: Fri, 15 Dec 2023 20:37:09 -0500
Subject: [PATCH 2/2] Fix lint errors

---
 src/js/chrome/chrome_shim.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/js/chrome/chrome_shim.js b/src/js/chrome/chrome_shim.js
index 9f0793c3..ceae7f0c 100644
--- a/src/js/chrome/chrome_shim.js
+++ b/src/js/chrome/chrome_shim.js
@@ -712,16 +712,18 @@ export function shimRTCRtpScriptTransform(window) {
         this._transfer = transfer;
       }
     };
-    const property = {
+    const prop = {
       get() {
         return this._transform || null;
       },
       set(transform) {
         if (transform && !(transform instanceof window.RTCRtpScriptTransform)) {
-          throw new TypeError("expected window.RTCRtpScriptTransform");
+          throw new TypeError('expected window.RTCRtpScriptTransform');
         }
         this._transform = transform || null;
-        if (!transform) return;
+        if (!transform) {
+          return;
+        }
         const {readable, writable} = this.createEncodedStreams();
         transform._worker.postMessage({
           rtctransform: {
@@ -730,7 +732,7 @@ export function shimRTCRtpScriptTransform(window) {
         }, [readable, writable, ...(transform._transfer || [])]);
       }
     };
-    Object.defineProperty(window.RTCRtpSender.prototype, 'transform', property);
-    Object.defineProperty(window.RTCRtpReceiver.prototype, 'transform', property);
+    Object.defineProperty(window.RTCRtpSender.prototype, 'transform', prop);
+    Object.defineProperty(window.RTCRtpReceiver.prototype, 'transform', prop);
   }
 }