1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/webaudio/the-audio-api/the-analysernode-interface/test-analyser-gain.html b/testing/web-platform/tests/webaudio/the-audio-api/the-analysernode-interface/test-analyser-gain.html
new file mode 100644
index 0000000000..dff51a74c5
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-analysernode-interface/test-analyser-gain.html
@@ -0,0 +1,50 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta charset="utf-8">
+  <script src="/resources/testharness.js"></script>
+  <script src="/resources/testharnessreport.js"></script>
+  <script>
+promise_test(function() {
+  // fftSize <= bufferSize so that the time domain data is full of input after
+  // processing the buffer.
+  const fftSize = 32;
+  const bufferSize = 128;
+
+  var context = new OfflineAudioContext(1, bufferSize, 48000);
+
+  var analyser1 = context.createAnalyser();
+  analyser1.fftSize = fftSize;
+  analyser1.connect(context.destination);
+  var analyser2 = context.createAnalyser();
+  analyser2.fftSize = fftSize;
+
+  var gain = context.createGain();
+  gain.gain.value = 2.0;
+  gain.connect(analyser1);
+  gain.connect(analyser2);
+
+  // Create a DC input to make getFloatTimeDomainData() output consistent at
+  // any time.
+  var buffer = context.createBuffer(1, 1, context.sampleRate);
+  buffer.getChannelData(0)[0] = 1.0 / gain.gain.value;
+  var source = context.createBufferSource();
+  source.buffer = buffer;
+  source.loop = true;
+  source.connect(gain);
+  source.start();
+
+  return context.startRendering().then(function(buffer) {
+    assert_equals(buffer.getChannelData(0)[0], 1.0, "analyser1 output");
+
+    var data = new Float32Array(1);
+    analyser1.getFloatTimeDomainData(data);
+    assert_equals(data[0], 1.0, "analyser1 time domain data");
+    analyser2.getFloatTimeDomainData(data);
+    assert_equals(data[0], 1.0, "analyser2 time domain data");
+  });
+}, "Test effect of AnalyserNode on GainNode output");
+  </script>
+</head>
+</body>
+</html>