WIP

src/audio/garden-audio-graph.ts

@@ -1,3 +1,4 @@
+import { appConfig } from '../config';
 import { clamp } from '../utils/clamp';
 import { GardenAudioConfig, GardenAudioVibeProfile } from './garden-audio-config';
 
@@ -11,6 +12,7 @@ export class GardenAudioGraph {
   private delayNode: DelayNode | null = null;
   private delayFeedback: GainNode | null = null;
   private delayOutput: GainNode | null = null;
+  private hasUnlocked = false;
 
   public constructor(private readonly config: GardenAudioConfig) {}
 
@@ -50,6 +52,26 @@ export class GardenAudioGraph {
     return context;
   }
 
+  // iOS WebKit (Safari + Chrome iOS) only fully unlocks audio output once
+  // a buffer source has been started inside a user-gesture handler. Calling
+  // resume() alone leaves the context "running" but silent.
+  public unlock(): void {
+    if (!this.context || this.hasUnlocked) {
+      return;
+    }
+
+    const buffer = this.context.createBuffer(
+      1,
+      appConfig.audioEngine.graph.unlockBufferLength,
+      appConfig.audioEngine.graph.unlockSampleRate
+    );
+    const source = this.context.createBufferSource();
+    source.buffer = buffer;
+    source.connect(this.context.destination);
+    source.start(0);
+    this.hasUnlocked = true;
+  }
+
   public setMasterGain(targetGain: number, timeConstantSeconds: number): void {
     if (!this.context || !this.masterGain) {
       return;
@@ -70,7 +92,7 @@ export class GardenAudioGraph {
     this.delayNode.delayTime.setTargetAtTime(
       this.config.delay.timeSeconds * profile.delayTimeMultiplier,
       this.context.currentTime,
-      0.12
+      appConfig.audioEngine.graph.delayTimeRampSeconds
     );
   }
 
@@ -83,17 +105,22 @@ export class GardenAudioGraph {
     this.delayNode.delayTime.setTargetAtTime(
       this.config.delay.timeSeconds * profile.delayTimeMultiplier,
       now,
-      0.12
+      appConfig.audioEngine.graph.delayTimeRampSeconds
     );
     this.delayFeedback.gain.setTargetAtTime(
-      this.config.delay.enabled
-        ? clamp(this.config.delay.feedback + activity * 0.08, 0.04, 0.32)
-        : 0,
+      clamp(
+        this.config.delay.feedback +
+          activity * appConfig.audioEngine.graph.delayActivityFeedbackWeight,
+        appConfig.audioEngine.graph.delayFeedbackMin,
+        appConfig.audioEngine.graph.delayFeedbackMax
+      ),
       now,
       this.config.updateRampSeconds
     );
     this.delayOutput.gain.setTargetAtTime(
-      this.config.delay.enabled ? this.config.delay.wetGain * (0.65 + activity * 0.5) : 0,
+      this.config.delay.wetGain *
+        (appConfig.audioEngine.graph.delayOutputBase +
+          activity * appConfig.audioEngine.graph.delayOutputActivityWeight),
       now,
       this.config.updateRampSeconds
     );
@@ -106,7 +133,11 @@ export class GardenAudioGraph {
     }
 
     if (this.masterGain && context.state !== 'closed') {
-      this.masterGain.gain.setTargetAtTime(0.0001, context.currentTime, 0.015);
+      this.masterGain.gain.setTargetAtTime(
+        appConfig.audioEngine.graph.closeGain,
+        context.currentTime,
+        appConfig.audioEngine.graph.closeRampSeconds
+      );
     }
 
     this.clearNodes();
@@ -123,8 +154,8 @@ export class GardenAudioGraph {
     const delayOutput = context.createGain();
 
     delayNode.delayTime.value = this.config.delay.timeSeconds;
-    delayFeedback.gain.value = this.config.delay.enabled ? this.config.delay.feedback : 0;
-    delayOutput.gain.value = this.config.delay.enabled ? this.config.delay.wetGain : 0;
+    delayFeedback.gain.value = this.config.delay.feedback;
+    delayOutput.gain.value = this.config.delay.wetGain;
 
     delayInput.connect(delayNode);
     delayNode.connect(delayFeedback);
@@ -140,7 +171,7 @@ export class GardenAudioGraph {
 
   private createBuses(context: AudioContext, masterGain: GainNode): void {
     this.eventBus = context.createGain();
-    this.eventBus.gain.value = 1;
+    this.eventBus.gain.value = appConfig.audioEngine.graph.eventBusGain;
     this.eventBus.connect(masterGain);
   }
 
@@ -149,7 +180,10 @@ export class GardenAudioGraph {
     const data = buffer.getChannelData(0);
 
     for (let index = 0; index < data.length; index++) {
-      data[index] = Math.random() * 2 - 1;
+      data[index] =
+        appConfig.audioEngine.graph.noiseMin +
+        Math.random() *
+          (appConfig.audioEngine.graph.noiseMax - appConfig.audioEngine.graph.noiseMin);
     }
 
     return buffer;
@@ -164,5 +198,6 @@ export class GardenAudioGraph {
     this.delayNode = null;
     this.delayFeedback = null;
     this.delayOutput = null;
+    this.hasUnlocked = false;
   }
 }