Working on menus

src/lib/csound/engine.ts

@@ -32,6 +32,7 @@ export class CsoundEngine {
   private scopeNode: AnalyserNode | null = null;
   private audioNode: AudioNode | null = null;
   private audioContext: AudioContext | null = null;
+  private gainNode: GainNode | null = null;
   private useCsound7: boolean;
 
   constructor(options: CsoundEngineOptions = {}) {
@@ -139,6 +140,7 @@ export class CsoundEngine {
     this.csound.on('onAudioNodeCreated', (node: AudioNode) => {
       this.audioNode = node;
       this.audioContext = node.context as AudioContext;
+      this.setupGainNode();
       this.log('Audio node created and captured');
     });
 
@@ -510,6 +512,26 @@ export class CsoundEngine {
     return this.audioContext;
   }
 
+  private setupGainNode(): void {
+    if (!this.audioNode || !this.audioContext || this.gainNode) {
+      return;
+    }
+
+    try {
+      this.gainNode = this.audioContext.createGain();
+      this.gainNode.gain.value = 1.0;
+
+      this.audioNode.disconnect();
+      this.audioNode.connect(this.gainNode);
+      this.gainNode.connect(this.audioContext.destination);
+
+      this.log('Gain node created and connected');
+    } catch (error) {
+      console.error('Failed to setup gain node:', error);
+      this.log('Error setting up gain node: ' + error);
+    }
+  }
+
   private setupAnalyser(): void {
     if (!this.audioNode || !this.audioContext) {
       this.log('Warning: Audio node not available yet');
@@ -517,13 +539,19 @@ export class CsoundEngine {
     }
 
     try {
+      if (!this.gainNode) {
+        this.setupGainNode();
+      }
+
       this.scopeNode = this.audioContext.createAnalyser();
       this.scopeNode.fftSize = 2048;
       this.scopeNode.smoothingTimeConstant = 0.3;
 
-      this.audioNode.disconnect();
-      this.audioNode.connect(this.scopeNode);
-      this.scopeNode.connect(this.audioContext.destination);
+      if (this.gainNode) {
+        this.gainNode.disconnect();
+        this.gainNode.connect(this.scopeNode);
+        this.scopeNode.connect(this.audioContext.destination);
+      }
 
       this.log('Analyser node created and connected');
       this.options.onAnalyserNodeCreated?.(this.scopeNode);
@@ -537,6 +565,20 @@ export class CsoundEngine {
     return this.scopeNode;
   }
 
+  setVolume(value: number): void {
+    if (!this.gainNode) {
+      return;
+    }
+    this.gainNode.gain.value = Math.max(0, Math.min(1, value));
+  }
+
+  getVolume(): number {
+    if (!this.gainNode) {
+      return 1.0;
+    }
+    return this.gainNode.gain.value;
+  }
+
   private log(message: string): void {
     this.options.onMessage?.(message);
   }