1 files changed, 38 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/gain-processor.js b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/gain-processor.js
new file mode 100644
index 0000000000..e9e130e374
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/processors/gain-processor.js
@@ -0,0 +1,38 @@
+/**
+ * @class GainProcessor
+ * @extends AudioWorkletProcessor
+ *
+ * This processor class demonstrates the bare-bone structure of the processor.
+ */
+class GainProcessor extends AudioWorkletProcessor {
+  static get parameterDescriptors() {
+    return [
+      {name: 'gain', defaultValue: 0.707}
+    ];
+  }
+
+  constructor() {
+    super();
+  }
+
+  process(inputs, outputs, parameters) {
+    let input = inputs[0];
+    let output = outputs[0];
+    let gain = parameters.gain;
+    for (let channel = 0; channel < input.length; ++channel) {
+      let inputChannel = input[channel];
+      let outputChannel = output[channel];
+      if (gain.length === 1) {
+        for (let i = 0; i < inputChannel.length; ++i)
+          outputChannel[i] = inputChannel[i] * gain[0];
+      } else {
+        for (let i = 0; i < inputChannel.length; ++i)
+          outputChannel[i] = inputChannel[i] * gain[i];
+      }
+    }
+
+    return true;
+  }
+}
+
+registerProcessor('gain', GainProcessor);