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<!DOCTYPE html>
<html>
<head>
<title>
ScriptProcessorNode on OfflineAudioContext
</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">
let audit = Audit.createTaskRunner();
// Fill the output of script processor with a constant value.
audit.define('simple-output', (task, should) => {
let sampleRate = 44100;
let scriptBufferSize = 256;
let renderLength = 1;
let PI = Math.fround(Math.PI);
let context =
new OfflineAudioContext(1, renderLength * sampleRate, sampleRate);
let scriptNode = context.createScriptProcessor(scriptBufferSize, 1, 1);
scriptNode.onaudioprocess = function(event) {
let outputChannel = event.outputBuffer.getChannelData(0);
outputChannel.fill(PI);
};
scriptNode.connect(context.destination);
context.startRendering().then(function(buffer) {
let channel = buffer.getChannelData(0);
let initialDelay = channel.subarray(0, 2 * scriptBufferSize);
let actualContent = channel.subarray(2 * scriptBufferSize);
// There is the initial delay (2 x buffer size) which is silent.
should(initialDelay, 'The initial delay contains zeros.')
.beConstantValueOf(0);
// After the initial delay, we must get |PI|.
should(actualContent, 'The actual content contains ' + PI)
.beConstantValueOf(PI);
task.done();
});
});
// Pass through an oscillator via a script processor. Sum with the
// phase-inverted oscillator with the delayed start time. Verify the
// rendered buffer is completely silent.
audit.define('oscillator-output', (task, should) => {
let sampleRate = 44100;
let scriptBufferSize = 256;
let renderLength = 1;
let context =
new OfflineAudioContext(1, renderLength * sampleRate, sampleRate);
let osc1 = context.createOscillator();
let osc2 = context.createOscillator();
let inverter = context.createGain();
let scriptNode = context.createScriptProcessor(scriptBufferSize, 1, 1);
scriptNode.onaudioprocess = function(event) {
let inputChannel = event.inputBuffer.getChannelData(0);
let outputChannel = event.outputBuffer.getChannelData(0);
outputChannel.set(inputChannel);
};
inverter.gain.value = -1;
osc1.connect(inverter).connect(context.destination);
osc2.connect(scriptNode).connect(context.destination);
// The delayed start for |osc1|.
osc1.start((2 * scriptBufferSize) / sampleRate);
osc2.start();
context.startRendering().then(function(buffer) {
let channel = buffer.getChannelData(0);
// The rendered buffer must be silent.
should(channel, 'The rendered buffer').beConstantValueOf(0);
task.done();
});
});
audit.run();
</script>
</body>
</html>