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https://github.com/servo/servo
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72 lines
2.4 KiB
HTML
72 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<title>Test setValueAtTime with startTime in the past</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script>
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function do_test(t, context) {
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var source = context.createBufferSource();
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source.buffer =
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function() {
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var buffer = context.createBuffer(1, 1, context.sampleRate);
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buffer.getChannelData(0)[0] = 1.0;
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return buffer;
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}();
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source.loop = true;
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source.start();
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// Use a ramp of slope 1/sample to measure time.
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// The end value is the extent of exact precision in single precision float.
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const rampEnd = Math.pow(2, 24);
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const rampEndSeconds = rampEnd / context.sampleRate;
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var test = context.createGain();
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test.gain.setValueAtTime(0.0, 0.0);
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test.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
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// With a different starting point on the same line, the result should be
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// the same. |currentTime| may include double precision floating point
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// rounding errors, so round to nearest integer sample to ignore these.
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var scheduledSample = Math.round(context.currentTime * context.sampleRate);
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assert_equals(scheduledSample % 128, 0,
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"currentTime advances in blocks of 128 samples");
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var reference = context.createGain();
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reference.gain.setValueAtTime(scheduledSample, context.currentTime);
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reference.gain.linearRampToValueAtTime(rampEnd, rampEndSeconds);
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source.connect(test);
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source.connect(reference);
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var merger = context.createChannelMerger();
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test.connect(merger, 0, 0);
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reference.connect(merger, 0, 1);
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var processor = context.createScriptProcessor(0, 2, 0);
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merger.connect(processor);
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processor.onaudioprocess =
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t.step_func_done((e) => {
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source.stop();
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processor.onaudioprocess = null;
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var testValue = e.inputBuffer.getChannelData(0)[0];
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var referenceValue = e.inputBuffer.getChannelData(1)[0];
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assert_equals(testValue, referenceValue,
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"ramp value matches expected");
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assert_greater_than_equal(testValue, scheduledSample,
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"time does not retreat");
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assert_equals(testValue % 128, 0,
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"ScriptProcessor blocks align on 128-sample blocks");
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});
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}
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async_test(function(t) {
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var context = new AudioContext;
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(function waitForTimeAdvance() {
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if (context.currentTime == 0) {
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t.step_timeout(waitForTimeAdvance, 0);
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} else {
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do_test(t, context);
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}
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})();
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});
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</script>
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