overhaul & improve Linux screenshare (#489)

Fixes fps/resolution not properly being applied
Enables hardware encoding via vaapi
Redesigns stream picker modal 

Co-authored-by: kaitlynkittyy <kaitlynyaadev@kaitlynyaa.dev>
Co-authored-by: Oleh Polisan <polisanoleg@gmail.com>
Co-authored-by: Vendicated <vendicated@riseup.net>

src/renderer/patches/index.ts

@@ -7,6 +7,6 @@
 // TODO: Possibly auto generate glob if we have more patches in the future
 import "./enableNotificationsByDefault";
 import "./platformClass";
-import "./screenShareAudio";
+import "./screenShareFixes";
 import "./spellCheck";
 import "./windowsTitleBar";

src/renderer/patches/screenShareFixes.ts

@@ -4,8 +4,12 @@
  * Copyright (c) 2023 Vendicated and Vencord contributors
  */
 
+import { Logger } from "@vencord/types/utils";
+import { currentSettings } from "renderer/components/ScreenSharePicker";
 import { isLinux } from "renderer/utils";
 
+const logger = new Logger("VesktopStreamFixes");
+
 if (isLinux) {
     const original = navigator.mediaDevices.getDisplayMedia;
 
@@ -23,6 +27,29 @@ if (isLinux) {
         const stream = await original.call(this, opts);
         const id = await getVirtmic();
 
+        const frameRate = Number(currentSettings?.fps);
+        const height = Number(currentSettings?.resolution);
+        const width = Math.round(height * (16 / 9));
+        const track = stream.getVideoTracks()[0];
+
+        track.contentHint = String(currentSettings?.contentHint);
+
+        const constraints = {
+            ...track.getConstraints(),
+            frameRate,
+            width: { min: 640, ideal: width, max: width },
+            height: { min: 480, ideal: height, max: height },
+            advanced: [{ width: width, height: height }],
+            resizeMode: "none"
+        };
+
+        track
+            .applyConstraints(constraints)
+            .then(() => {
+                logger.info("Applied constraints successfully. New constraints: ", track.getConstraints());
+            })
+            .catch(e => logger.error("Failed to apply constraints.", e));
+
         if (id) {
             const audio = await navigator.mediaDevices.getUserMedia({
                 audio: {