openvidu-test-app: allow forcing encoder resolution change on a video publisher with LocalVideoTrack.restartTrack method

openvidu-testapp/src/app/components/video-track/video-track.component.css

@@ -56,18 +56,31 @@ video {
 /* Keep the form-field visually compact (16×16 clipped box).
    The CDK overlay uses the Popover API (top layer) so it is
    immune to overflow:hidden and renders at its natural size. */
-#max-video-quality {
+#max-video-quality,
+#restart-video-resolution {
   width: 16px;
   height: 16px;
   overflow: hidden;
   font-size: 10px;
   font-weight: bold;
+  --mat-form-field-container-vertical-padding: 0px;
 }
 
-::ng-deep #max-video-quality .mdc-notched-outline * {
+/* The MDC outlined text field reserves 16px of horizontal padding
+   for the value, which alone exceeds this 16px-wide box and pushes
+   the value/arrow trigger (and therefore the dropdown svg) out of
+   the visible area. Removing it keeps the trigger inside the clip. */
+::ng-deep #max-video-quality .mat-mdc-text-field-wrapper,
+::ng-deep #restart-video-resolution .mat-mdc-text-field-wrapper {
+  padding: 0;
+}
+
+::ng-deep #max-video-quality .mdc-notched-outline *,
+::ng-deep #restart-video-resolution .mdc-notched-outline * {
   border-color: transparent !important;
 }
 
-::ng-deep #max-video-quality .mat-mdc-form-field-subscript-wrapper {
+::ng-deep #max-video-quality .mat-mdc-form-field-subscript-wrapper,
+::ng-deep #restart-video-resolution .mat-mdc-form-field-subscript-wrapper {
   display: none !important;
 }

openvidu-testapp/src/app/components/video-track/video-track.component.html

@@ -7,20 +7,26 @@
         <mat-icon aria-label="Mute/Unmute video" class="mat-icon material-icons" role="img"
         aria-hidden="true">{{muteVideoIcon}}</mat-icon>
       </button>
-    }
+
-    @if (localParticipant) {
       <button (click)="unpublishTrack()" class="video-btn publish-unpublish-video" matTooltip="Unpublish track"
         matTooltipClass="custom-tooltip">
         <mat-icon aria-label="Unpublish track" class="mat-icon material-icons" role="img"
         aria-hidden="true">stop</mat-icon>
       </button>
-    }
+
-    @if (localParticipant) {
       <button (click)="openProcessorDialog()" class="video-btn toggle-track-processor" matTooltip="Open track processor settings"
         matTooltipClass="custom-tooltip">
         <mat-icon aria-label="Open track processor settings" class="mat-icon material-icons" role="img"
         aria-hidden="true">auto_fix_high</mat-icon>
       </button>
+
+      <mat-form-field id="restart-video-resolution" class="video-btn quality-option" matTooltip="Restart video at resolution" matTooltipClass="custom-tooltip">
+        <mat-select [(value)]="restartResolution" (selectionChange)="onRestartResolutionChange()">
+          @for (r of ['1920x1080', '1280x720', '640x360', '320x180']; track r) {
+            <mat-option [value]="r" [ngClass]="'res-' + r">{{r}}</mat-option>
+          }
+        </mat-select>
+      </mat-form-field>
     }
     @if (!localParticipant) {
       <button (click)="toggleEnableTrack()" class="video-btn toggle-video-enabled" matTooltip="Toggle track enabled"
@@ -28,15 +34,13 @@
         <mat-icon aria-label="Toggle track enabled" class="mat-icon material-icons" role="img"
         aria-hidden="true">{{trackEnabled ? 'toggle_off' : 'toggle_on'}}</mat-icon>
       </button>
-    }
+
-    @if (!localParticipant) {
       <button (click)="toggleSubscribeTrack()" class="video-btn toggle-video-subscribed" matTooltip="Toggle track subscription"
         matTooltipClass="custom-tooltip">
         <mat-icon aria-label="Toggle track subscription" class="mat-icon material-icons" role="img"
         aria-hidden="true">{{trackSubscribed ? 'stop' : 'play_arrow'}}</mat-icon>
       </button>
-    }
+
-    @if (!localParticipant) {
       <mat-form-field id="max-video-quality" class="video-btn quality-option"  matTooltip="Set video quality" matTooltipClass="custom-tooltip">
         <mat-select [(value)]="maxVideoQuality" (selectionChange)="onQualityChange()">
           @for (q of ['LOW', 'MEDIUM', 'HIGH']; track q) {

openvidu-testapp/src/app/components/video-track/video-track.component.ts

@@ -2,6 +2,7 @@ import { Component, inject, ChangeDetectionStrategy } from '@angular/core';
 import { NgClass } from '@angular/common';
 import {
   LocalTrack,
+  LocalVideoTrack,
   VideoTrack,
   RemoteTrackPublication,
   VideoQuality,
@@ -32,6 +33,8 @@ import { MatSelectModule } from '@angular/material/select';
 export class VideoTrackComponent extends TrackComponent {
   muteVideoIcon: string = 'videocam';
   maxVideoQuality: string;
+  // Resolution to re-capture the local video track at (see onRestartResolutionChange)
+  restartResolution: string;
 
   videoZoom = false;
 
@@ -96,6 +99,16 @@ export class VideoTrackComponent extends TrackComponent {
     );
   }
 
+  // Re-captures the local video track at the selected resolution. Useful to make
+  // the encoder change its layer structure on the fly: an SVC encoder drops its
+  // upper spatial layers when the capture is too small to host them
+  async onRestartResolutionChange() {
+    const [width, height] = this.restartResolution.split('x').map(Number);
+    await (this._track as LocalVideoTrack).restartTrack({
+      resolution: { width, height, frameRate: 30 },
+    });
+  }
+
   openInfoDialog() {
     const updateFunction = async (): Promise<string> => {
       const videoLayers: any[] = [];