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test for bug 864171 and bug 1053011 r=padenot
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webaudio/the-audio-api/the-audioparam-interface/retrospective-setValueAtTime.html
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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.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(); | ||
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// 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); | ||
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// 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); | ||
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source.connect(test); | ||
source.connect(reference); | ||
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var merger = context.createChannelMerger(); | ||
test.connect(merger, 0, 0); | ||
reference.connect(merger, 0, 1); | ||
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var processor = context.createScriptProcessor(0, 2, 0); | ||
merger.connect(processor); | ||
processor.onaudioprocess = | ||
t.step_func_done((e) => { | ||
source.stop(); | ||
processor.onaudioprocess = null; | ||
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var testValue = e.inputBuffer.getChannelData(0)[0]; | ||
var referenceValue = e.inputBuffer.getChannelData(1)[0]; | ||
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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"); | ||
}); | ||
} | ||
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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> |