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<title>
Test AudioBufferSourceNode premature loop stop
</title>
<script src="../../imported/w3c/web-platform-tests/resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../resources/audit-util.js"></script>
<script src="../resources/audit.js"></script>
</head>
<body>
<script id="layout-test-code">
// Reasonably low sample rate for the optimum test speed.
let sampleRate = 8192;
let audit = Audit.createTaskRunner();
// Task: Create a buffer with 3 regions filled with constant value of [1,
// 2, 3]. Then set a loop range over the second region. Start the loop and
// disable it in the middle of looping. Verify the rendered buffer has the
// entire content including the looped region.
audit.define('premature-loop-stop', (task, should) => {
let regionValues = [1, 2, 3];
// The region length is 2 * render quantum size to be able to suspend
// the rendering at the half of the region.
let regionLength = 256;
// The test will repeat the second region 3 times, thus the rendered
// audio have the length of 5 * regionLength.
let context = new OfflineAudioContext(1, 5 * regionLength, sampleRate);
// Create 3 constant buffers of [1, 2, 3] and concatenate them together:
// | 1 | 2 | 3 |
let testBuffer = context.createBuffer(1, 3 * regionLength, sampleRate);
let testChannel = testBuffer.getChannelData(0);
for (let i = 0; i < regionValues.length; i++) {
let region =
createConstantBuffer(context, regionLength, regionValues[i]);
testChannel.set(region.getChannelData(0), regionLength * i);
;
}
let source = context.createBufferSource();
source.connect(context.destination);
source.buffer = testBuffer;
source.loop = true;
// Set loop points over the region 2.
source.loopStart = regionLength / sampleRate;
source.loopEnd = 2 * regionLength / sampleRate;
source.start();
// Disengage the loop at |3.5 * regionLength / sampleRate| which is the
// end of 7th rendering quantum and also the half of the third iteration
// of region #2.
context.suspend(3.5 * regionLength / sampleRate).then(function() {
source.loop = false;
context.resume();
});
context.startRendering()
.then(function(renderedBuffer) {
let channel = renderedBuffer.getChannelData(0);
// Verify if the rendered buffer has the following structure:
// | 1 | 2 | 2 | 2 | 3 |
let region1 = channel.subarray(0, regionLength - 1);
let region2 =
channel.subarray(regionLength, 4 * regionLength - 1);
let region3 =
channel.subarray(4 * regionLength, 5 * regionLength - 1);
should(region1, 'Region #1').beConstantValueOf(1);
should(region2, 'Region #2 (looped)').beConstantValueOf(2);
should(region3, 'Region #3').beConstantValueOf(3);
})
.then(() => task.done());
});
audit.run();
</script>
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