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+<!DOCTYPE html>
+<title>Test setTargetAtTime after an event in the same processing block</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script>
+promise_test(function() {
+ const bufferSize = 179;
+ const valueStartOffset = 42;
+ const targetStartOffset = 53;
+ const sampleRate = 48000;
+ const scheduledValue = -0.5;
+
+ var context = new OfflineAudioContext(1, bufferSize, sampleRate);
+
+ var gain = context.createGain();
+ gain.gain.setValueAtTime(scheduledValue, valueStartOffset/sampleRate);
+ gain.gain.setTargetAtTime(scheduledValue, targetStartOffset/sampleRate,
+ 128/sampleRate);
+ gain.connect(context.destination);
+
+ // Apply unit DC signal to gain node.
+ var source = context.createBufferSource();
+ source.buffer =
+ function() {
+ var buffer = context.createBuffer(1, 1, context.sampleRate);
+ buffer.getChannelData(0)[0] = 1.0;
+ return buffer;
+ }();
+ source.loop = true;
+ source.start();
+ source.connect(gain);
+
+ return context.startRendering().
+ then(function(buffer) {
+ assert_equals(buffer.length, bufferSize, "output buffer length");
+ var output = buffer.getChannelData(0);
+ var i = 0;
+ for (; i < valueStartOffset; ++i) {
+ // "Its default value is 1."
+ assert_equals(output[i], 1.0, "default gain at sample " + i);
+ }
+ for (; i < buffer.length; ++i) {
+ // "If the next event (having time T1) after this SetValue event is
+ // not of type LinearRampToValue or ExponentialRampToValue, then, for
+ // T0≤t<T1: v(t)=V".
+ // "Start exponentially approaching the target value at the given time
+ // with a rate having the given time constant."
+ // The target is the same value, and so the SetValue value continues.
+ assert_equals(output[i], scheduledValue,
+ "scheduled value at sample " + i);
+ }
+ });
+});
+</script>