Add internal support for @discordjs/opus to v11 (#3700)

* Add internal support for @discordjs/opus

* Remove redundant try/catch

* fix: use setBitrate method in @discordjs/opus

* chore: tidy up opus imports

* fix: correct imports for DiscordJsOpusEngine

* chore: update docs to prefer @discordjs/opus

* chore: bump prism-media to 0.0.4 to allow ffmpeg-static

src/client/voice/opus/DiscordJsOpusEngine.js

@@ -0,0 +1,34 @@
+const OpusEngine = require('./BaseOpusEngine');
+
+class DiscordJsOpusEngine extends OpusEngine {
+  constructor(player) {
+    super(player);
+    const opus = require('@discordjs/opus');
+    this.encoder = new opus.OpusEncoder(this.samplingRate, this.channels);
+    super.init();
+  }
+
+  setBitrate(bitrate) {
+    this.encoder.setBitrate(Math.min(128, Math.max(16, bitrate)) * 1000);
+  }
+
+  setFEC(enabled) {
+    this.encoder.applyEncoderCTL(this.ctl.FEC, enabled ? 1 : 0);
+  }
+
+  setPLP(percent) {
+    this.encoder.applyEncoderCTL(this.ctl.PLP, Math.min(100, Math.max(0, percent * 100)));
+  }
+
+  encode(buffer) {
+    super.encode(buffer);
+    return this.encoder.encode(buffer, 1920);
+  }
+
+  decode(buffer) {
+    super.decode(buffer);
+    return this.encoder.decode(buffer, 1920);
+  }
+}
+
+module.exports = DiscordJsOpusEngine;

src/client/voice/opus/NodeOpusEngine.js

@@ -1,15 +1,9 @@
 const OpusEngine = require('./BaseOpusEngine');
 
-let opus;
-
 class NodeOpusEngine extends OpusEngine {
   constructor(player) {
     super(player);
-    try {
-      opus = require('node-opus');
-    } catch (err) {
-      throw err;
-    }
+    const opus = require('node-opus');
     this.encoder = new opus.OpusEncoder(this.samplingRate, this.channels);
     super.init();
   }

src/client/voice/opus/OpusEngineList.js

@@ -1,4 +1,5 @@
 const list = [
+  require('./DiscordJsOpusEngine'),
   require('./NodeOpusEngine'),
   require('./OpusScriptEngine'),
 ];

src/client/voice/opus/OpusScriptEngine.js

@@ -1,15 +1,9 @@
 const OpusEngine = require('./BaseOpusEngine');
 
-let OpusScript;
-
 class OpusScriptEngine extends OpusEngine {
   constructor(player) {
     super(player);
-    try {
-      OpusScript = require('opusscript');
-    } catch (err) {
-      throw err;
-    }
+    const OpusScript = require('opusscript');
     this.encoder = new OpusScript(this.samplingRate, this.channels);
     super.init();
   }