86 lines
2.9 KiB
HTML
86 lines
2.9 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>
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oscillator-late-start.html
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</title>
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<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
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<script src="../../resources/testharnessreport.js"></script>
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<script src="../resources/audit-util.js"></script>
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<script src="../resources/audit.js"></script>
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</head>
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<body>
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<script id="layout-test-code">
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let audit = Audit.createTaskRunner();
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let sampleRate = 44100;
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let renderLength = 1;
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let context;
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let node;
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// Test the oscillator node is rendered correctly when the start time of
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// start() call is in the past in terms of the context time.
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audit.define('initialize', (task, should) => {
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should(
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() => context = new OfflineAudioContext(
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1, sampleRate * renderLength, sampleRate),
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'Creating offline context for testing')
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.notThrow();
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should(() => {
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// Set up a dummy signal path to keep the audio context running and
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// spend processing time before calling start(0).
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let osc = context.createOscillator();
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let silent = context.createGain();
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osc.connect(silent);
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silent.connect(context.destination);
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silent.gain.setValueAtTime(0.0, 0);
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osc.start();
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node = context.createOscillator();
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node.connect(context.destination);
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}, 'Creating graph for testing').notThrow();
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task.done();
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});
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audit.define('test-late-start', (task, should) => {
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// The node's start time will be clamped to the render quantum boundary
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// >0.1 sec. Thus the rendered buffer will have non-zero frames.
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// See issue: crbug.com/462167
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let suspendTime = 0.1;
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let suspendFrame = 128 * Math.floor(0.1 * context.sampleRate / 128);
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context.suspend(suspendTime).then(() => {
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node.start(0);
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context.resume();
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});
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// Start rendering and verify result: this verifies if 1) the rendered
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// buffer contains at least one non-zero value and 2) the non-zero value
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// is found later than the first output sample.
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context.startRendering()
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.then(buffer => {
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let channelData = buffer.getChannelData(0);
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let nonZeroValueIndex = channelData.findIndex(x => x != 0);
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should(
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nonZeroValueIndex,
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'The index (' + nonZeroValueIndex +
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') of first non-zero output value')
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.beGreaterThanOrEqualTo(suspendFrame);
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should(
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channelData.slice(0, suspendFrame),
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'Output[0:' + (suspendFrame - 1) + ']')
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.beConstantValueOf(0);
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})
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.then(() => task.done());
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;
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});
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audit.run();
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</script>
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</body>
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</html>
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