fix(screenshot-capture): Impl screenshot capture in multi-stream mode.

react/features/base/conference/middleware.web.js

@@ -8,6 +8,7 @@ import {
     setSkipPrejoinOnReload
 } from '../../prejoin';
 import { setScreenAudioShareState, setScreenshareAudioTrack } from '../../screen-share';
+import { isScreenshotCaptureEnabled, toggleScreenshotCaptureSummary } from '../../screenshot-capture';
 import { AudioMixerEffect } from '../../stream-effects/audio-mixer/AudioMixerEffect';
 import { setAudioOnly } from '../audio-only';
 import { getMultipleVideoSendingSupportFeatureFlag } from '../config/functions.any';
@@ -165,6 +166,9 @@ async function _toggleScreenSharing({ enabled, audioOnly = false }, store) {
             } else {
                 await dispatch(addLocalTrack(desktopVideoTrack));
             }
+            if (isScreenshotCaptureEnabled(state, false, true)) {
+                dispatch(toggleScreenshotCaptureSummary(true));
+            }
         }
 
         // Apply the AudioMixer effect if there is a local audio track, add the desktop track to the conference
@@ -188,6 +192,8 @@ async function _toggleScreenSharing({ enabled, audioOnly = false }, store) {
     } else {
         const { desktopAudioTrack } = state['features/screen-share'];
 
+        dispatch(toggleScreenshotCaptureSummary(false));
+
         // Mute the desktop track instead of removing it from the conference since we don't want the client to signal
         // a source-remove to the remote peer for the screenshare track. Later when screenshare is enabled again, the
         // same sender will be re-used without the need for signaling a new ssrc through source-add.

react/features/screenshot-capture/actions.js

@@ -1,7 +1,7 @@
 // @flow
 
-import { getLocalVideoTrack } from '../../features/base/tracks';
-
+import { getLocalJitsiDesktopTrack, getLocalJitsiVideoTrack } from '../../features/base/tracks';
+import { getMultipleVideoSendingSupportFeatureFlag } from '../base/config';
 
 import { SET_SCREENSHOT_CAPTURE } from './actionTypes';
 import { createScreenshotCaptureSummary } from './functions';
@@ -46,12 +46,13 @@ export function toggleScreenshotCaptureSummary(enabled: boolean) {
 
             if (enabled) {
                 try {
-                    const { jitsiTrack } = getLocalVideoTrack(state['features/base/tracks']);
+                    const jitsiTrack = getMultipleVideoSendingSupportFeatureFlag(state)
+                        ? getLocalJitsiDesktopTrack(state)
+                        : getLocalJitsiVideoTrack(state);
 
                     await screenshotSummary.start(jitsiTrack);
                     dispatch(setScreenshotCapture(enabled));
                 } catch {
-
                     // Handle promise rejection from {@code start} due to stream type not being desktop.
                     logger.error('Unsupported stream type.');
                 }

react/features/screenshot-capture/index.js

@@ -1 +1,2 @@
 export * from './actions';
+export * from './functions';