fix virtual camera support (#1215)

Co-authored-by: V <vendicated@riseup.net>

src/renderer/patches/fixStreamConstraints.ts

@@ -7,33 +7,45 @@
 import { Logger } from "@vencord/types/utils";
 import { MediaEngineStore } from "renderer/common";
 
-const logger = new Logger("FixAutoGain");
+const logger = new Logger("VesktopStreamFixes");
 
-function fixTrackConstraints(constraint: MediaTrackConstraints) {
+function fixAudioTrackConstraints(constraint: MediaTrackConstraints) {
     const target = constraint.advanced?.find(opt => Object.hasOwn(opt, "autoGainControl")) ?? constraint;
 
     target.autoGainControl = MediaEngineStore.getAutomaticGainControl();
 }
 
-function fixStreamConstraints(constraints: MediaStreamConstraints | undefined) {
-    if (!constraints?.audio) return;
+function fixVideoTrackConstraints(constraint: MediaTrackConstraints) {
+    if (typeof constraint.deviceId === "string" && constraint.deviceId !== "default") {
+        constraint.deviceId = { exact: constraint.deviceId };
+    }
+}
 
+function fixStreamConstraints(constraints: MediaStreamConstraints | undefined) {
+    if (!constraints) return;
+
+    if (constraints.audio) {
         if (typeof constraints.audio !== "object") {
             constraints.audio = {};
         }
+        fixAudioTrackConstraints(constraints.audio);
+    }
 
-    fixTrackConstraints(constraints.audio);
+    if (constraints.video) {
+        if (typeof constraints.video !== "object") {
+            constraints.video = {};
+        }
+        fixVideoTrackConstraints(constraints.video);
+    }
 }
 
 const originalGetUserMedia = navigator.mediaDevices.getUserMedia;
 navigator.mediaDevices.getUserMedia = function (constraints) {
     try {
         fixStreamConstraints(constraints);
-        logger.debug("Fixed getUserMedia constraints", constraints);
     } catch (e) {
         logger.error("Failed to fix getUserMedia constraints", e);
     }
-
     return originalGetUserMedia.call(this, constraints);
 };
 
@@ -41,10 +53,13 @@ const originalApplyConstraints = MediaStreamTrack.prototype.applyConstraints;
 MediaStreamTrack.prototype.applyConstraints = function (constraints) {
     if (constraints) {
         try {
-            fixTrackConstraints(constraints);
-            logger.debug("Fixed applyConstraints constraints", constraints);
+            if (this.kind === "audio") {
+                fixAudioTrackConstraints(constraints);
+            } else if (this.kind === "video") {
+                fixVideoTrackConstraints(constraints);
+            }
         } catch (e) {
-            logger.error("Failed to fix applyConstraints constraints", e);
+            logger.error("Failed to fix constraints", e);
         }
     }
     return originalApplyConstraints.call(this, constraints);