Support ManagedMediaSource and update docs to reflect iOS 17.1+ supports MSE (#8160)

* Refactor media source handling in MsePlayer.js and Birdseye.jsx to support ManagedMediaSource

* lint

* Update docs to reflect iOS supporting mse

---------

Co-authored-by: Sergey Krashevich <svk@svk.su>

docs/docs/configuration/live.md

@@ -10,9 +10,9 @@ Frigate has different live view options, some of which require the bundled `go2r
 Live view options can be selected while viewing the live stream. The options are:
 
 | Source | Latency | Frame Rate                            | Resolution     | Audio                        | Requires go2rtc | Other Limitations                                 |
-| ------ | ------- | ------------------------------------- | -------------- | ---------------------------- | --------------- | -------------------------------------------- |
+| ------ | ------- | ------------------------------------- | -------------- | ---------------------------- | --------------- | ------------------------------------------------- |
 | jsmpeg | low     | same as `detect -> fps`, capped at 10 | same as detect | no                           | no              | none                                              |
-| mse    | low     | native                                | native         | yes (depends on audio codec) | yes             | not supported on iOS, Firefox is h.264 only  |
+| mse    | low     | native                                | native         | yes (depends on audio codec) | yes             | iPhone requires iOS 17.1+, Firefox is h.264 only  |
 | webrtc | lowest  | native                                | native         | yes (depends on audio codec) | yes             | requires extra config, doesn't support h.265      |
 
 ### Audio Support

web/src/components/MsePlayer.js

@@ -157,12 +157,9 @@ class VideoRTC extends HTMLElement {
     if (this.ws) this.ws.send(JSON.stringify(value));
   }
 
-  codecs(type) {
-    const test =
-      type === 'mse'
-        ? (codec) => MediaSource.isTypeSupported(`video/mp4; codecs="${codec}"`)
-        : (codec) => this.video.canPlayType(`video/mp4; codecs="${codec}"`);
-    return this.CODECS.filter(test).join();
+  /** @param {Function} isSupported */
+  codecs(isSupported) {
+    return this.CODECS.filter(codec => isSupported(`video/mp4; codecs="${codec}"`)).join();
   }
 
   /**
@@ -311,7 +308,7 @@ class VideoRTC extends HTMLElement {
 
     const modes = [];
 
-    if (this.mode.indexOf('mse') >= 0 && 'MediaSource' in window) {
+    if (this.mode.indexOf('mse') >= 0 && ('MediaSource' in window || 'ManagedMediaSource' in window)) {
       // iPhone
       modes.push('mse');
       this.onmse();
@@ -363,18 +360,29 @@ class VideoRTC extends HTMLElement {
   }
 
   onmse() {
-    const ms = new MediaSource();
-    ms.addEventListener(
-      'sourceopen',
-      () => {
+    /** @type {MediaSource} */
+    let ms;
+
+    if ('ManagedMediaSource' in window) {
+      const MediaSource = window.ManagedMediaSource;
+
+      ms = new MediaSource();
+      ms.addEventListener('sourceopen', () => {
+        this.send({type: 'mse', value: this.codecs(MediaSource.isTypeSupported)});
+      }, {once: true});
+
+      this.video.disableRemotePlayback = true;
+      this.video.srcObject = ms;
+    } else {
+      ms = new MediaSource();
+      ms.addEventListener('sourceopen', () => {
         URL.revokeObjectURL(this.video.src);
-        this.send({ type: 'mse', value: this.codecs('mse') });
-      },
-      { once: true }
-    );
+        this.send({type: 'mse', value: this.codecs(MediaSource.isTypeSupported)});
+      }, {once: true});
 
       this.video.src = URL.createObjectURL(ms);
       this.video.srcObject = null;
+    }
     this.play();
 
     this.mseCodecs = '';
@@ -580,7 +588,7 @@ class VideoRTC extends HTMLElement {
       video2.src = `data:video/mp4;base64,${VideoRTC.btoa(data)}`;
     };
 
-    this.send({ type: 'mp4', value: this.codecs('mp4') });
+    this.send({ type: 'mp4', value: this.codecs(this.video.canPlayType) });
   }
 
   static btoa(buffer) {

web/src/routes/Birdseye.jsx

@@ -35,7 +35,7 @@ export default function Birdseye() {
   let player;
   const playerClass = ptzCameras.length || isMaxWidth ? 'w-full' : 'max-w-5xl xl:w-1/2';
   if (viewSource == 'mse' && config.birdseye.restream) {
-    if ('MediaSource' in window) {
+    if ('MediaSource' in window || 'ManagedMediaSource' in window) {
       player = (
         <Fragment>
           <div className={playerClass}>
@@ -50,7 +50,7 @@ export default function Birdseye() {
       player = (
         <Fragment>
           <div className="w-5xl text-center text-sm">
-            MSE is not supported on iOS devices. You'll need to use jsmpeg or webRTC. See the docs for more info.
+            MSE is only supported on iOS 17.1+. You'll need to update if available or use jsmpeg / webRTC streams. See the docs for more info.
           </div>
         </Fragment>
       );

web/src/routes/Camera.jsx

@@ -116,7 +116,7 @@ export default function Camera({ camera }) {
   let player;
   if (viewMode === 'live') {
     if (viewSource == 'mse' && restreamEnabled) {
-      if ('MediaSource' in window) {
+      if ('MediaSource' in window || 'ManagedMediaSource' in window) {
         player = (
           <Fragment>
             <div className="max-w-5xl">
@@ -133,7 +133,7 @@ export default function Camera({ camera }) {
         player = (
           <Fragment>
             <div className="w-5xl text-center text-sm">
-              MSE is not supported on iOS devices. You'll need to use jsmpeg or webRTC. See the docs for more info.
+            MSE is only supported on iOS 17.1+. You'll need to update if available or use jsmpeg / webRTC streams. See the docs for more info.
             </div>
           </Fragment>
         );