Cleanup when Piper#encode() errors

lib/voice/Piper.js

@@ -68,6 +68,7 @@ class Piper extends EventEmitter {
                         } else {
                             this.emit("error", new Error("An error occured trying to access that file."));
                         }
+                        this.reset();
                         return false;
                     }
                     source = FS.createReadStream(source);
@@ -97,6 +98,7 @@ class Piper extends EventEmitter {
                 if(!options.format) {
                     if(!this.converterCommand) {
                         this.emit("error", new Error("FFmpeg/avconv was not found on this system. Playback of this audio format is impossible"));
+                        this.reset();
                         return false;
                     }
                     if(typeof source === "string") {
@@ -168,6 +170,7 @@ class Piper extends EventEmitter {
             }
         } else {
             this.emit("error", new Error("Unrecognized format"));
+            this.reset();
             return false;
         }
 
@@ -206,14 +209,6 @@ class Piper extends EventEmitter {
             this._endStream.removeAllListeners("data");
         }
 
-        for(const stream of this.streams) {
-            if(typeof stream.destroy === "function") {
-                stream.destroy();
-            } else {
-                stream.unpipe();
-            }
-        }
-
         this.reset();
         if(this.encoding) {
             this.encoding = false;
@@ -222,6 +217,16 @@ class Piper extends EventEmitter {
     }
 
     reset() {
+        if(this.streams) {
+            for(const stream of this.streams) {
+                if(typeof stream.destroy === "function") {
+                    stream.destroy();
+                } else {
+                    stream.unpipe();
+                }
+            }
+        }
+
         this.streams = [];
         this._endStream = null;
         this.volume = null;