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<!DOCTYPE html>
<title>Test effect of AnalyserNode on GainNode output</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
promise_test(function() {
// fftSize <= bufferSize so that the time domain data is full of input after
// processing the buffer.
const fftSize = 32;
const bufferSize = 128;
var context = new OfflineAudioContext(1, bufferSize, 48000);
var analyser1 = context.createAnalyser();
analyser1.fftSize = fftSize;
analyser1.connect(context.destination);
var analyser2 = context.createAnalyser();
analyser2.fftSize = fftSize;
var gain = context.createGain();
gain.gain.value = 2.0;
gain.connect(analyser1);
gain.connect(analyser2);
// Create a DC input to make getFloatTimeDomainData() output consistent at
// any time.
var buffer = context.createBuffer(1, 1, context.sampleRate);
buffer.getChannelData(0)[0] = 1.0 / gain.gain.value;
var source = context.createBufferSource();
source.buffer = buffer;
source.loop = true;
source.connect(gain);
source.start();
return context.startRendering().
then(function(buffer) {
assert_equals(buffer.getChannelData(0)[0], 1.0,
"analyser1 output");
var data = new Float32Array(1);
analyser1.getFloatTimeDomainData(data);
assert_equals(data[0], 1.0, "analyser1 time domain data");
analyser2.getFloatTimeDomainData(data);
assert_equals(data[0], 1.0, "analyser2 time domain data");
});
});
</script>
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