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<!DOCTYPE html>
<html>
<head>
<title>
Test Start Grain with Delayed Buffer Setting
</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/webaudio/resources/audit-util.js"></script>
<script src="/webaudio/resources/audit.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
let context;
let source;
let buffer;
let renderedData;
let sampleRate = 44100;
let testDurationSec = 1;
let testDurationSamples = testDurationSec * sampleRate;
let startTime = 0.9 * testDurationSec;
audit.define(
'Test setting the source buffer after starting the grain',
function(task, should) {
context =
new OfflineAudioContext(1, testDurationSamples, sampleRate);
buffer = createConstantBuffer(context, testDurationSamples, 1);
source = context.createBufferSource();
source.connect(context.destination);
// Start the source BEFORE we set the buffer. The grain offset and
// duration aren't important, as long as we specify some offset.
source.start(startTime, .1);
source.buffer = buffer;
// Render it!
context.startRendering()
.then(function(buffer) {
checkResult(buffer, should);
})
.then(task.done.bind(task));
;
});
function checkResult(buffer, should) {
let success = false;
renderedData = buffer.getChannelData(0);
// Check that the rendered data is not all zeroes. Any non-zero data
// means the test passed.
let startFrame = Math.round(startTime * sampleRate);
for (k = 0; k < renderedData.length; ++k) {
if (renderedData[k]) {
success = true;
break;
}
}
should(success, 'Buffer was played').beTrue();
}
audit.run();
</script>
</body>
</html>
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