VolumeBooster: Support browser and Vesktop (#2730)

src/plugins/volumeBooster/README.md

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+# Volume Booster
+
+Allows you to boost the volume over 200% on desktop and over 100% on other clients.
+
+Works on users, bots, and streams!
+
+![the volume being moved up to 270% on vesktop](https://github.com/user-attachments/assets/793e012e-c069-4fa4-a3d5-61c2f55edd3e)
+
+![the volume being moved up to 297% on a stream](https://github.com/user-attachments/assets/77463eb9-2537-4821-a3ab-82f60633ccbc)

src/plugins/volumeBooster/index.ts

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+/*
+ * Vencord, a modification for Discord's desktop app
+ * Copyright (c) 2022 Vendicated and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { definePluginSettings } from "@api/Settings";
+import { makeRange } from "@components/PluginSettings/components";
+import { Devs } from "@utils/constants";
+import definePlugin, { OptionType } from "@utils/types";
+
+const settings = definePluginSettings({
+    multiplier: {
+        description: "Volume Multiplier",
+        type: OptionType.SLIDER,
+        markers: makeRange(1, 5, 1),
+        default: 2,
+        stickToMarkers: true,
+    }
+});
+
+interface StreamData {
+    audioContext: AudioContext,
+    audioElement: HTMLAudioElement,
+    emitter: any,
+    // added by this plugin
+    gainNode?: GainNode,
+    id: string,
+    levelNode: AudioWorkletNode,
+    sinkId: string,
+    stream: MediaStream,
+    streamSourceNode?: MediaStreamAudioSourceNode,
+    videoStreamId: string,
+    _mute: boolean,
+    _speakingFlags: number,
+    _volume: number;
+}
+
+export default definePlugin({
+    name: "VolumeBooster",
+    authors: [Devs.Nuckyz, Devs.sadan],
+    description: "Allows you to set the user and stream volume above the default maximum",
+    settings,
+
+    patches: [
+        // Change the max volume for sliders to allow for values above 200
+        ...[
+            ".Messages.USER_VOLUME",
+            "currentVolume:"
+        ].map(find => ({
+            find,
+            replacement: {
+                match: /(?<=maxValue:)\i\.\i\?(\d+?):(\d+?)(?=,)/,
+                replace: (_, higherMaxVolume, minorMaxVolume) => `${higherMaxVolume}*$self.settings.store.multiplier`
+            }
+        })),
+        // Patches needed for web/vesktop
+        {
+            find: "streamSourceNode",
+            predicate: () => IS_WEB,
+            group: true,
+            replacement: [
+                // Remove rounding algorithm
+                {
+                    match: /Math\.max.{0,30}\)\)/,
+                    replace: "arguments[0]"
+                },
+                // Patch the volume
+                {
+                    match: /\.volume=this\._volume\/100;/,
+                    replace: ".volume=0.00;$self.patchVolume(this);"
+                }
+            ]
+        },
+        // Prevent Audio Context Settings sync from trying to sync with values above 200, changing them to 200 before we send to Discord
+        {
+            find: "AudioContextSettingsMigrated",
+            replacement: [
+                {
+                    match: /(?<=isLocalMute\(\i,\i\),volume:.+?volume:)\i(?=})/,
+                    replace: "$&>200?200:$&"
+                },
+                {
+                    match: /(?<=Object\.entries\(\i\.localMutes\).+?volume:).+?(?=,)/,
+                    replace: "$&>200?200:$&"
+                },
+                {
+                    match: /(?<=Object\.entries\(\i\.localVolumes\).+?volume:).+?(?=})/,
+                    replace: "$&>200?200:$&"
+                }
+            ]
+        },
+        // Prevent the MediaEngineStore from overwriting our LocalVolumes above 200 with the ones the Discord Audio Context Settings sync sends
+        {
+            find: '="MediaEngineStore",',
+            replacement: [
+                {
+                    match: /(\.settings\.audioContextSettings.+?)(\i\[\i\])=(\i\.volume)(.+?setLocalVolume\(\i,).+?\)/,
+                    replace: (_, rest1, localVolume, syncVolume, rest2) => rest1
+                        + `(${localVolume}>200?void 0:${localVolume}=${syncVolume})`
+                        + rest2
+                        + `${localVolume}??${syncVolume})`
+                }
+            ]
+        }
+    ],
+
+    patchVolume(data: StreamData) {
+        if (data.stream.getAudioTracks().length === 0) return;
+
+        data.streamSourceNode ??= data.audioContext.createMediaStreamSource(data.stream);
+
+        if (!data.gainNode) {
+            const gain = data.gainNode = data.audioContext.createGain();
+            data.streamSourceNode.connect(gain);
+            gain.connect(data.audioContext.destination);
+        }
+
+        data.gainNode.gain.value = data._mute
+            ? 0
+            : data._volume / 100;
+    }
+});