This change enables the control of several identical devices which have the same port name. An internal port numbering was added, which works via the getInput and getOutput function and links the internal names with the actual ports of node-midi.

Author: atomic7122

index.js

@@ -40,14 +40,15 @@ class Input extends EventEmitter {
     this._pendingSysex = false;
     this._sysex = [];
     this.name = name;
+    this.inputPortNumberedNames = getInputs();
 
     if (virtual) {
       this._input.openVirtualPort(name);
     } else {
       const numInputs = this._input.getPortCount();
       let found = false;
       for (let i = 0; i < numInputs; i++) {
-        if (name === this._input.getPortName(i)) {
+        if (name === this.inputPortNumberedNames[i]) {
           found = true;
           this._input.openPort(i);
         }
@@ -196,14 +197,15 @@ class Output {
   constructor(name, virtual) {
     this._output = new midi.output();
     this.name = name;
+    this.outputPortNumberedNames = getOutputs();
 
     if (virtual) {
       this._output.openVirtualPort(name);
     } else {
       const numOutputs = this._output.getPortCount();
       let found = false;
       for (let i = 0; i < numOutputs; i++) {
-        if (name === this._output.getPortName(i)) {
+        if (name === this.outputPortNumberedNames[i]) {
           found = true;
           this._output.openPort(i);
         }
@@ -282,7 +284,14 @@ const getInputs = () => {
   const input = new midi.input();
   const inputs = [];
   for (let i = 0; i < input.getPortCount(); i++) {
-    inputs.push(input.getPortName(i));
+    var counter = 0;
+    const portName = input.getPortName(i);
+    var numberedPortName = portName;
+    while(inputs.includes(numberedPortName)) {
+      counter++;
+      numberedPortName = portName + counter;
+    }
+    inputs.push(numberedPortName);
   }
   input.closePort();
   return inputs;
@@ -292,7 +301,14 @@ const getOutputs = () => {
   const output = new midi.output();
   const outputs = [];
   for (let i = 0; i < output.getPortCount(); i++) {
-    outputs.push(output.getPortName(i));
+    var counter = 0;
+    const portName = output.getPortName(i);
+    var numberedPortName = portName;
+    while(outputs.includes(numberedPortName)) {
+      counter++;
+      numberedPortName = portName + counter;
+    }
+    outputs.push(numberedPortName);
   }
   output.closePort();
   return outputs;