Try to prime the audio system so that sounds starting after a timer will work

Author: curiousdannii

src/glkote/web/schannels.ts

@@ -22,7 +22,21 @@ export class SoundChannelManager extends Map<number, SoundChannel> {
     constructor(glkote: WebGlkOte) {
         super()
         this.glkote = glkote
-        this.context = new AudioContext()
+        const context = new AudioContext()
+        this.context = context
+
+        // Try to prime the audio system so that sounds starting after a timer will work
+        const gain = context.createGain()
+        const sine_node = context.createOscillator()
+        gain.gain.value = 0.001
+        sine_node.frequency.value = 22000
+        sine_node.connect(gain)
+        gain.connect(context.destination)
+        sine_node.start()
+        setTimeout(() => {
+            gain.disconnect()
+            sine_node.stop()
+        }, 10)
     }
 
     async update(schannels: protocol.SoundChannelUpdate[]) {