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<!DOCTYPE html>
<html>
<head>
<script src="../resources/js-test.js"></script>
<script src="resources/compatibility.js"></script>
<script type="text/javascript" src="resources/audio-testing.js"></script>
</head>
<body>
<div id="description"></div>
<div id="console"></div>
<script>
description("This test verifies that the AudioBasicInspectorNode based nodes work correctly.");
var sampleRate = 44100.0;
// We carefully arrange the renderLengthInFrames to be a multiple of the AudioNode rendering quantum (AudioNode::ProcessingSizeInFrames)
// so that AudioSourceNode will not feed tailing zeroes into the context and fail this test.
var renderLengthInFrames = 256;
var fftSize = 64;
var audioDataOne = 255; // Audio data 1.0 in Uint8 format will be 255.
var audioDataZero = 128; // Audio data 0 in Uint8 format will be 128.
var context;
var constantBuffer;
var bufferSource;
var analyser;
function constructCommonGraph() {
// Create offline audio context.
context = new OfflineAudioContext(1, renderLengthInFrames, sampleRate);
constantBuffer = createConstantBuffer(context, renderLengthInFrames, 1);
bufferSource = context.createBufferSource();
bufferSource.buffer = constantBuffer;
analyser = context.createAnalyser();
analyser.fftSize = fftSize;
bufferSource.connect(analyser);
}
function test1Finished() {
var timeDomainData = new Uint8Array(fftSize);
analyser.getByteTimeDomainData(timeDomainData);
if (timeDomainData[0] >= audioDataOne)
testPassed("RealtimeAnalyserNode got pulled when connected from upstream node but not to downstream node.");
else
testFailed("RealtimeAnalyserNode failed to get pulled when connected from upstream node but not to downstream node.");
test2();
}
// To verify the realtimeAnalyser can pull data when there is an upstream node connected to it
// but it's not connected to a downstream node.
function test1() {
constructCommonGraph();
bufferSource.start(0);
context.oncomplete = test1Finished;
context.startRendering();
}
function test2Finished() {
var timeDomainData = new Uint8Array(fftSize);
analyser.getByteTimeDomainData(timeDomainData);
if (timeDomainData[0] >= audioDataOne)
testPassed("RealtimeAnalyserNode got pulled when connected from upstream node and to destination node.");
else
testFailed("RealtimeAnalyserNode failed to be pulled when connected by upstream node and to destination node.");
test3();
}
// To verify the realtimeAnalyser can process normally when there is an upstream node connected to it
// and it's also connected to a downstream node which ultimately connect to audio destination.
function test2() {
constructCommonGraph();
analyser.connect(context.destination);
bufferSource.start(0);
context.oncomplete = test2Finished;
context.startRendering();
}
function test3Finished() {
var timeDomainData = new Uint8Array(fftSize);
analyser.getByteTimeDomainData(timeDomainData);
// If realtimeAnalyser hasn't pulled any data, the data in buffer will be 0.
if (timeDomainData[0] == audioDataZero)
testPassed("RealtimeAnalyserNode didn't get pulled when it should not.");
else
testFailed("RealtimeAnalyserNode been pulled when it should not.");
finishJSTest();
}
// To verify the realtimeAnalyser will stop pulling if it is connected to a downstream node
// which is not ultimatly connected to any audio destination.
function test3() {
constructCommonGraph();
var gain = context.createGain();
analyser.connect(gain);
bufferSource.start(0);
context.oncomplete = test3Finished;
context.startRendering();
}
function runTest() {
if (window.testRunner) {
testRunner.dumpAsText();
testRunner.waitUntilDone();
}
window.jsTestIsAsync = true;
test1();
}
runTest();
</script>
</body>
</html>