1 files changed, 90 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/simple-input-output.https.html b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/simple-input-output.https.html
new file mode 100644
index 0000000000..7b9e7f0ac3
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioworklet-interface/simple-input-output.https.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Test Simple AudioWorklet I/O</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+    <script src="/webaudio/resources/audit.js"></script>
+    <script src="/webaudio/resources/audit-util.js"></script>
+  </head>
+
+  <body>
+    <script>
+      // Arbitrary sample rate
+      const sampleRate = 48000;
+
+      // The offset to be applied by the worklet to its inputs.
+      const offset = 1;
+
+      // Location of the worklet's code
+      const filePath = 'processors/add-offset.js';
+
+      let audit = Audit.createTaskRunner();
+
+      // Context to be used for the tests.
+      let context;
+
+      audit.define('Initialize worklet', (task, should) => {
+        // Two channels for testing.  Channel 0 is the output of the
+        // AudioWorklet.  Channel 1 is the oscillator so we can compare
+        // the outputs.
+        context = new OfflineAudioContext(
+            {numberOfChannels: 2, length: sampleRate, sampleRate: sampleRate});
+
+        // Load up the code for the worklet.
+        should(
+            context.audioWorklet.addModule(filePath),
+            'Creation of AudioWorklet')
+            .beResolved()
+            .then(() => task.done());
+      });
+
+      audit.define(
+          {label: 'test', description: 'Simple AudioWorklet I/O'},
+          (task, should) => {
+            let merger = new ChannelMergerNode(
+                context, {numberOfChannels: context.destination.channelCount});
+            merger.connect(context.destination);
+
+            let src = new OscillatorNode(context);
+
+            let worklet = new AudioWorkletNode(
+                context, 'add-offset-processor',
+                {processorOptions: {offset: offset}});
+
+            src.connect(worklet).connect(merger, 0, 0);
+            src.connect(merger, 0, 1);
+
+            // Start and stop the source.  The stop time is fairly arbitrary,
+            // but use a render quantum boundary for simplicity.
+            const stopFrame = RENDER_QUANTUM_FRAMES;
+            src.start(0);
+            src.stop(stopFrame / context.sampleRate);
+
+            context.startRendering()
+                .then(buffer => {
+                  let ch0 = buffer.getChannelData(0);
+                  let ch1 = buffer.getChannelData(1);
+
+                  let shifted = ch1.slice(0, stopFrame).map(x => x + offset);
+
+                  // The initial part of the output should be the oscillator
+                  // shifted by |offset|.
+                  should(
+                      ch0.slice(0, stopFrame),
+                      `AudioWorklet output[0:${stopFrame - 1}]`)
+                      .beCloseToArray(shifted, {absoluteThreshold: 0});
+
+                  // Output should be constant after the source has stopped.
+                  should(
+                      ch0.slice(stopFrame),
+                      `AudioWorklet output[${stopFrame}:]`)
+                      .beConstantValueOf(offset);
+                })
+                .then(() => task.done());
+          });
+
+      audit.run();
+    </script>
+  </body>
+</html>