Add opusscript as a possible opus encoder (#558)

* Add opusscript as a possible opus encoder

* Make weird eslint rule happy

package.json

@@ -35,7 +35,8 @@
     "fs-extra": "^0.30.0"
   },
   "optionalDependencies": {
-    "node-opus": "^0.1.13"
+    "node-opus": "^0.1.13",
+    "opusscript": "^0.0.1"
   },
   "engines": {
     "node": ">=0.12.7"

src/client/voice/opus/NodeOpusEngine.js

@@ -20,7 +20,7 @@ class NodeOpusEngine extends OpusEngine {
   }
 
   decode(buffer) {
-    super.encode(buffer);
+    super.decode(buffer);
     return this.encoder.decode(buffer, 1920);
   }
 }

src/client/voice/opus/OpusEngineList.js

@@ -1,5 +1,6 @@
 const list = [
   require('./NodeOpusEngine'),
+  require('./OpusScriptEngine'),
 ];
 
 exports.add = encoder => {

src/client/voice/opus/OpusScriptEngine.js

@@ -0,0 +1,28 @@
+const OpusEngine = require('./BaseOpusEngine');
+
+let Opusscript;
+
+class NodeOpusEngine extends OpusEngine {
+  constructor(player) {
+    super(player);
+    try {
+      // eslint-disable-next-line import/no-unresolved
+      Opusscript = require('opusscript');
+    } catch (err) {
+      throw err;
+    }
+    this.encoder = new Opusscript(48000, 2);
+  }
+
+  encode(buffer) {
+    super.encode(buffer);
+    return this.encoder.encode(buffer, 960);
+  }
+
+  decode(buffer) {
+    super.decode(buffer);
+    return this.encoder.decode(buffer);
+  }
+}
+
+module.exports = NodeOpusEngine;