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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-channelmergernode-interface/audiochannelmerger-input-non-default.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<title>
audiochannelmerger-input-non-default.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>
<script src="/webaudio/resources/merger-testing.js"></script>
</head>
<body>
<script id="layout-test-code">
let audit = Audit.createTaskRunner();
// Task: Check if an inactive input renders a silent mono channel in the
// output.
audit.define('silent-channel', (task, should) => {
testMergerInput(should, {
numberOfChannels: 7,
// Create a mono source buffer filled with '1'.
testBufferContent: [1],
// Connect the output of source into the 7th input of merger.
mergerInputIndex: 6,
// 7th channel should be '1'.
expected: [0, 0, 0, 0, 0, 0, 1],
}).then(() => task.done());
});
// Task: Check if a stereo input is being down-mixed to mono channel
// correctly based on the mixing rule.
audit.define('stereo-down-mixing', (task, should) => {
testMergerInput(should, {
numberOfChannels: 7,
// Create a stereo buffer filled with '1' and '2' for left and right
// channels respectively.
testBufferContent: [1, 2],
// Connect the output of source into the 7th input of merger.
mergerInputIndex: 6,
// The result of summed and down-mixed stereo audio should be 1.5.
// (= 1 * 0.5 + 2 * 0.5)
expected: [0, 0, 0, 0, 0, 0, 1.5],
}).then(() => task.done());
});
// Task: Check if 3-channel input gets processed by the 'discrete' mixing
// rule.
audit.define('undefined-channel-layout', (task, should) => {
testMergerInput(should, {
numberOfChannels: 7,
// Create a 3-channel buffer filled with '1', '2', and '3'
// respectively.
testBufferContent: [1, 2, 3],
// Connect the output of source into the 7th input of merger.
mergerInputIndex: 6,
// The result of summed stereo audio should be 1 because 3-channel is
// not a canonical layout, so the input channel 2 and 3 should be
// dropped by 'discrete' mixing rule.
expected: [0, 0, 0, 0, 0, 0, 1],
}).then(() => task.done());
});
audit.run();
</script>
</body>
</html>