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113 lines
3.8 KiB
HTML
113 lines
3.8 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<title>
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audiochannelmerger-input.html
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</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/webaudio/resources/audit-util.js"></script>
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<script src="/webaudio/resources/audit.js"></script>
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<script src="/webaudio/resources/merger-testing.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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// Task: Check if an inactive input renders a silent mono channel in the
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// output.
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audit.define('silent-channel', (task, should) => {
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testMergerInput(should, {
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numberOfChannels: 6,
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// Create a mono source buffer filled with '1'.
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testBufferContent: [1],
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// Connect the output of source into the 4th input of merger.
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mergerInputIndex: 3,
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// All channels should contain 0, except channel 4 which should be 1.
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expected: [0, 0, 0, 1, 0, 0],
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}).then(() => task.done());
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});
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// Task: Check if a stereo input is being down-mixed to mono channel
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// correctly based on the mixing rule.
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audit.define('stereo-down-mixing', (task, should) => {
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testMergerInput(should, {
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numberOfChannels: 6,
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// Create a stereo buffer filled with '1' and '2' for left and right
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// channels respectively.
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testBufferContent: [1, 2],
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// Connect the output of source into the 1st input of merger.
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mergerInputIndex: undefined,
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// The result of summed and down-mixed stereo audio should be 1.5.
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// (= 1 * 0.5 + 2 * 0.5)
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expected: [1.5, 0, 0, 0, 0, 0],
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}).then(() => task.done());
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});
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// Task: Check if 3-channel input gets processed by the 'discrete' mixing
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// rule.
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audit.define('undefined-channel-layout', (task, should) => {
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testMergerInput(should, {
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numberOfChannels: 6,
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// Create a 3-channel buffer filled with '1', '2', and '3'
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// respectively.
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testBufferContent: [1, 2, 3],
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// Connect the output of source into the 1st input of merger.
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mergerInputIndex: undefined,
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// The result of summed stereo audio should be 1 because 3-channel is
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// not a canonical layout, so the input channel 2 and 3 should be
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// dropped by 'discrete' mixing rule.
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expected: [1, 0, 0, 0, 0, 0],
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}).then(() => task.done());
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});
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// Task: Merging two inputs into a single stereo stream.
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audit.define('merging-to-stereo', (task, should) => {
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// For this test, the number of channel should be 2.
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let context = new OfflineAudioContext(2, 128, 44100);
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let merger = context.createChannelMerger();
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let source1 = context.createBufferSource();
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let source2 = context.createBufferSource();
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// Create a DC offset buffer (mono) filled with 1 and assign it to BS
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// nodes.
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let positiveDCOffset = createConstantBuffer(context, 128, 1);
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let negativeDCOffset = createConstantBuffer(context, 128, -1);
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source1.buffer = positiveDCOffset;
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source2.buffer = negativeDCOffset;
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// Connect: BS#1 => merger_input#0, BS#2 => Inverter => merger_input#1
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source1.connect(merger, 0, 0);
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source2.connect(merger, 0, 1);
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merger.connect(context.destination);
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source1.start();
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source2.start();
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context.startRendering().then(function(buffer) {
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// Channel#0 = 1, Channel#1 = -1
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should(buffer.getChannelData(0), 'Channel #0').beConstantValueOf(1);
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should(buffer.getChannelData(1), 'Channel #1').beConstantValueOf(-1);
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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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