From 69dfa301428835a20d98237e78c4de221db1aa97 Mon Sep 17 00:00:00 2001
From: Leonard Kim <leonard.kim@8x8.com>
Date: Thu, 10 Jan 2019 15:39:17 -0800
Subject: [PATCH] feat(screenshare): use camera as a screenshare source

This feature is intended for spot. Spot can have an
HDMI -> usb adapter hooked up to it. In that case,
attempting to screenshare should use that adapter
as a screensharing source. Jitsi-Meet should pass
a configured screenshare source into lib-jitsi-meet
so it can be used as a source.
---
 conference.js                           | 6 ++++++
 config.js                               | 7 +++++++
 react/features/base/config/functions.js | 1 +
 react/features/base/tracks/functions.js | 2 ++
 4 files changed, 16 insertions(+)

diff --git a/conference.js b/conference.js
index 8ab94c3e32..9541247497 100644
--- a/conference.js
+++ b/conference.js
@@ -1488,6 +1488,8 @@ export default {
         const wasVideoMuted = this.isLocalVideoMuted();
 
         return createLocalTracksF({
+            desktopSharingSourceDevice: options.desktopSharingSources
+                ? null : config._desktopSharingSourceDevice,
             desktopSharingSources: options.desktopSharingSources,
             devices: [ 'desktop' ],
             desktopSharingExtensionExternalInstallation: {
@@ -1645,6 +1647,7 @@ export default {
         // Handling:
         // JitsiTrackErrors.PERMISSION_DENIED
         // JitsiTrackErrors.CHROME_EXTENSION_INSTALLATION_ERROR
+        // JitsiTrackErrors.CONSTRAINT_FAILED
         // JitsiTrackErrors.GENERAL
         // and any other
         let descriptionKey;
@@ -1668,6 +1671,9 @@ export default {
                 descriptionKey = 'dialog.screenSharingPermissionDeniedError';
                 titleKey = 'dialog.screenSharingFailedToInstallTitle';
             }
+        } else if (error.name === JitsiTrackErrors.CONSTRAINT_FAILED) {
+            descriptionKey = 'dialog.cameraConstraintFailedError';
+            titleKey = 'deviceError.cameraError';
         } else {
             descriptionKey = 'dialog.screenSharingFailedToInstall';
             titleKey = 'dialog.screenSharingFailedToInstallTitle';
diff --git a/config.js b/config.js
index db70da9b96..1f51e361ff 100644
--- a/config.js
+++ b/config.js
@@ -386,6 +386,13 @@ var config = {
     //   analyticsInterval: 60000,
     //   }
 
+    // If set, will attempt to use the provided video input device label when
+    // triggering a screenshare, instead of proceeding through the normal flow
+    // for obtaining a desktop stream.
+    // NOTE: This option is experimental and is currently intended for internal
+    // use only.
+    // _desktopSharingSourceDevice: 'sample-id-or-label'
+
     // List of undocumented settings used in jitsi-meet
     /**
      _immediateReloadThreshold
diff --git a/react/features/base/config/functions.js b/react/features/base/config/functions.js
index 48b5c4388e..348c00284f 100644
--- a/react/features/base/config/functions.js
+++ b/react/features/base/config/functions.js
@@ -17,6 +17,7 @@ declare var $: Object;
  * @type Array
  */
 const WHITELISTED_KEYS = [
+    '_desktopSharingSourceDevice',
     '_peerConnStatusOutOfLastNTimeout',
     '_peerConnStatusRtcMuteTimeout',
     'abTesting',
diff --git a/react/features/base/tracks/functions.js b/react/features/base/tracks/functions.js
index 2af87c71b9..f8424bb626 100644
--- a/react/features/base/tracks/functions.js
+++ b/react/features/base/tracks/functions.js
@@ -62,6 +62,8 @@ export function createLocalTracksF(
                 desktopSharingExtensionExternalInstallation:
                     options.desktopSharingExtensionExternalInstallation,
                 desktopSharingFrameRate,
+                desktopSharingSourceDevice:
+                    options.desktopSharingSourceDevice,
                 desktopSharingSources: options.desktopSharingSources,
 
                 // Copy array to avoid mutations inside library.