Update Files

Kinc/Backends/System/Wasm/JS-Sources/audio-thread.js

@@ -0,0 +1,75 @@
+// from https://developer.mozilla.org/en-US/docs/Web/API/AudioWorkletNode
+
+function create_thread(func) {
+
+}
+
+class AudioThread extends AudioWorkletProcessor {
+  constructor(...args) {
+    super(...args);
+
+    const self = this;
+
+    this.port.onmessageerror = (e) => {
+      console.error('Error', e);
+    };
+
+    this.port.onmessage = (e) => {
+      console.log('Audio onmessage');
+
+      const mod = e.data.mod;
+      const memory = e.data.memory;
+      
+      const importObject = {
+        env: { memory },
+        imports: {
+          imported_func: arg => console.log('thread: ' + arg),
+          create_thread
+        }
+      };
+
+      WebAssembly.instantiate(mod, importObject).then((instance) => {
+        console.log('Running audio thread');
+        self.audio_func = instance.exports.audio_func;
+        self.audio_pointer = instance.exports.malloc(16 * 1024);
+        console.log('Audio pointer: ' + self.audio_pointer);
+        console.log('Memory byteLength: ' + memory.buffer.byteLength);
+        self.audio_data = new Float32Array(
+          memory.buffer,
+          self.audio_pointer,
+          16 * 256
+        );
+      });
+    };
+  }
+
+  process(inputs, outputs, parameters) {
+    const output = outputs[0];
+
+    const data = output[0];
+
+    //for (let i = 0; i < data.length; ++i) {
+    //  data[i] = Math.random() * 2 - 1;
+    //}
+
+    if (this.audio_func) {
+      let offset = 0;
+      for (;;) {
+        const length = Math.min(data.length - offset, this.audio_data.length);
+        this.audio_func(this.audio_pointer + offset, length);
+        for (let i = 0; i < length; ++i) {
+          data[offset + i] = this.audio_data[i];
+        }
+
+        if (offset + this.audio_data.length >= data.length) {
+          break;
+        }
+        offset += this.audio_data.length;
+      }
+    }
+
+    return true;
+  }
+}
+
+registerProcessor('audio-thread', AudioThread);