--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -29107,16 +29107,22 @@
"items": {
"testharness": {
"media-source/SourceBuffer-abort-readyState.html": [
{
"path": "media-source/SourceBuffer-abort-readyState.html",
"timeout": "long",
"url": "/media-source/SourceBuffer-abort-readyState.html"
}
+ ],
+ "webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html": [
+ {
+ "path": "webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html",
+ "url": "/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html"
+ }
]
}
},
"reftest_nodes": {}
},
"reftest_nodes": {
"2dcontext/building-paths/canvas_complexshapes_arcto_001.htm": [
{
new file mode 100644
--- /dev/null
+++ b/testing/web-platform/tests/webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html
@@ -0,0 +1,71 @@
+<!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.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();
+
+ // 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, 0.0);
+ test.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
+
+ // With a different starting point on the same line, the result should be
+ // the same. |currentTime| may include double precision floating point
+ // rounding errors, so round to nearest integer sample to ignore these.
+ var scheduledSample = Math.round(context.currentTime * context.sampleRate);
+ assert_equals(scheduledSample % 128, 0,
+ "currentTime advances in blocks of 128 samples");
+ var reference = context.createGain();
+ reference.gain.setValueAtTime(scheduledSample, 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");
+ assert_greater_than_equal(testValue, scheduledSample,
+ "time does not retreat");
+ assert_equals(testValue % 128, 0,
+ "ScriptProcessor blocks align on 128-sample blocks");
+ });
+}
+
+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>