blob: 251c6a11f15bd607c04d98afb7ac82373a2878dd [file] [log] [blame]
<!DOCTYPE html>
<html>
<head>
<script src="../resources/js-test.js"></script>
<script type="text/javascript" src="resources/audio-testing.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
description("Tests AudioProcessingEvent attributes in IDL.");
var sampleRate = 44100.0;
// For the current implementation of ScriptProcessorNode, when it works with OfflineAudioContext (which runs much faster
// than real-time) the event.inputBuffer might be overwrite again before onaudioprocess ever get chance to be called.
// We carefully arrange the renderLengthInFrames and bufferSize to have exactly the same value to avoid this issue.
var renderLengthInFrames = 512;
var bufferSize = 512;
var duration = 5;
var frequency = 100;
var context;
function processAudioData(event) {
shouldBeDefined("event.playbackTime");
shouldBeDefined("event.inputBuffer");
shouldBeDefined("event.outputBuffer");
var expectedTime = context.currentTime + (bufferSize / context.sampleRate);
var allowedTimeGap = 0.0000001;
// There may be a little time gap which is from different thread operation
// between currentTime when main thread fires onaudioprocess() and currenTime when read in JS
// since currentTime is continuously increasing on audio thread.
shouldBeCloseTo("event.playbackTime", expectedTime, allowedTimeGap, true);
}
function runTest() {
window.jsTestIsAsync = true;
// Create offline audio context.
context = new webkitOfflineAudioContext(2, renderLengthInFrames, sampleRate);
var oscillator = context.createOscillator();
oscillator.frequency.value = frequency;
oscillator.type = 0;
var scriptProcessorNode = context.createScriptProcessor(bufferSize, 1, 1);
oscillator.connect(scriptProcessorNode);
scriptProcessorNode.onaudioprocess = processAudioData;
var gainNode = context.createGain();
scriptProcessorNode.connect(gainNode);
gainNode.connect(context.destination);
gainNode.gain.value = 2;
var startTime = context.currentTime;
oscillator.start(startTime);
oscillator.stop(startTime + duration);
context.oncomplete = finishJSTest;
context.startRendering();
}
runTest();
</script>
</body>
</html>