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+<!DOCTYPE html>
+<title>Test setValueAtTime with startTime in the past</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+function do_test(t, context) {
+ var source = context.createConstantSource();
+ source.start();
+
+ // Use a ramp of slope 1/sample to measure time.
+ // The end value is the extent of exact precision in single precision float.
+ const rampEnd = Math.pow(2, 24);
+ const rampEndSeconds = rampEnd / context.sampleRate;
+ var test = context.createGain();
+ test.gain.setValueAtTime(0.0, 0.5*context.currentTime);
+ test.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
+
+ var reference = context.createGain();
+ reference.gain.setValueAtTime(0.0, context.currentTime);
+ reference.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
+
+ source.connect(test);
+ source.connect(reference);
+
+ var merger = context.createChannelMerger();
+ test.connect(merger, 0, 0);
+ reference.connect(merger, 0, 1);
+
+ var processor = context.createScriptProcessor(0, 2, 0);
+ merger.connect(processor);
+ processor.onaudioprocess =
+ t.step_func_done((e) => {
+ source.stop();
+ processor.onaudioprocess = null;
+
+ var testValue = e.inputBuffer.getChannelData(0)[0];
+ var referenceValue = e.inputBuffer.getChannelData(1)[0];
+
+ assert_equals(testValue, referenceValue,
+ "ramp value matches expected");
+ });
+}
+
+async_test(function(t) {
+ var context = new AudioContext;
+ (function waitForTimeAdvance() {
+ if (context.currentTime == 0) {
+ t.step_timeout(waitForTimeAdvance, 0);
+ } else {
+ do_test(t, context);
+ }
+ })();
+});
+</script>