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<!DOCTYPE html>
<html>
<head>
<title>
audiochannelmerger-disconnect.html
</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 renderQuantum = 128;
let numberOfChannels = 2;
let sampleRate = 44100;
let renderDuration = 0.5;
let disconnectTime = 0.5 * renderDuration;
let audit = Audit.createTaskRunner();
// Task: Check if the merger outputs a silent channel when an input is
// disconnected.
audit.define('silent-disconnect', (task, should) => {
let context = new OfflineAudioContext(
numberOfChannels, renderDuration * sampleRate, sampleRate);
let merger = context.createChannelMerger();
let source1 = context.createBufferSource();
let source2 = context.createBufferSource();
// Create and assign a constant buffer.
let bufferDCOffset = createConstantBuffer(context, 1, 1);
source1.buffer = source2.buffer = bufferDCOffset;
source1.loop = source2.loop = true;
// Connect the output of source into the 4th input of merger. The merger
// should produce 6 channel output.
source1.connect(merger, 0, 0);
source2.connect(merger, 0, 1);
merger.connect(context.destination);
source1.start();
source2.start();
// Schedule the disconnection of |source2| at the half of render
// duration.
context.suspend(disconnectTime).then(function() {
source2.disconnect();
context.resume();
});
context.startRendering()
.then(function(buffer) {
// The entire first channel of the output should be 1.
should(buffer.getChannelData(0), 'Channel #0')
.beConstantValueOf(1);
// Calculate the first zero index in the second channel.
let channel1 = buffer.getChannelData(1);
let disconnectIndex = disconnectTime * sampleRate;
disconnectIndex = renderQuantum *
Math.floor(
(disconnectIndex + renderQuantum - 1) / renderQuantum);
let firstZeroIndex = channel1.findIndex(function(element, index) {
if (element === 0)
return index;
});
// The second channel should contain 1, and 0 after the
// disconnection.
should(channel1, 'Channel #1').containValues([1, 0]);
should(
firstZeroIndex, 'The index of first zero in the channel #1')
.beEqualTo(disconnectIndex);
})
.then(() => task.done());
});
audit.run();
</script>
</body>
</html>
|
