Show how long a call was on call tiles

src/DateUtils.ts

@@ -123,6 +123,19 @@ export function formatTime(date: Date, showTwelveHour = false): string {
     return pad(date.getHours()) + ':' + pad(date.getMinutes());
 }
 
+export function formatCallTime(delta: Date): string {
+    const hours = delta.getUTCHours();
+    const minutes = delta.getUTCMinutes();
+    const seconds = delta.getUTCSeconds();
+
+    let output = "";
+    if (hours) output += `${hours}h `;
+    if (minutes || output) output += `${minutes}m `;
+    if (seconds || output) output += `${seconds}s`;
+
+    return output;
+}
+
 const MILLIS_IN_DAY = 86400000;
 export function wantsDateSeparator(prevEventDate: Date, nextEventDate: Date): boolean {
     if (!nextEventDate || !prevEventDate) {

src/components/structures/CallEventGrouper.ts

@@ -61,6 +61,10 @@ export default class CallEventGrouper extends EventEmitter {
         return [...this.events].find((event) => event.getType() === EventType.CallReject);
     }
 
+    private get selectAnswer(): MatrixEvent {
+        return [...this.events].find((event) => event.getType() === EventType.CallSelectAnswer);
+    }
+
     public get isVoice(): boolean {
         const invite = this.invite;
         if (!invite) return;
@@ -82,6 +86,11 @@ export default class CallEventGrouper extends EventEmitter {
         return Boolean(this.reject);
     }
 
+    public get duration(): Date {
+        if (!this.hangup || !this.selectAnswer) return;
+        return new Date(this.hangup.getDate().getTime() - this.selectAnswer.getDate().getTime());
+    }
+
     /**
      * Returns true if there are only events from the other side - we missed the call
      */

src/components/views/messages/CallEvent.tsx

@@ -25,6 +25,7 @@ import { CallErrorCode, CallState } from 'matrix-js-sdk/src/webrtc/call';
 import InfoTooltip, { InfoTooltipKind } from '../elements/InfoTooltip';
 import classNames from 'classnames';
 import AccessibleTooltipButton from '../elements/AccessibleTooltipButton';
+import { formatCallTime } from "../../../DateUtils";
 
 interface IProps {
     mxEvent: MatrixEvent;
@@ -131,9 +132,14 @@ export default class CallEvent extends React.Component<IProps, IState> {
                 // https://github.com/vector-im/riot-android/issues/2623
                 // Also the correct hangup code as of VoIP v1 (with underscore)
                 // Also, if we don't have a reason
+                const duration = this.props.callEventGrouper.duration;
+                let text = _t("Call ended");
+                if (duration) {
+                    text += " • " + formatCallTime(duration);
+                }
                 return (
                     <div className="mx_CallEvent_content">
-                        { _t("Call ended") }
+                        { text }
                     </div>
                 );
             } else if (hangupReason === CallErrorCode.InviteTimeout) {