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<!doctype html>
<meta charset=utf-8>
<title></title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
// This value is purposefuly not aligned on a 128-block boundary so that we test
// that the PannerNode position audioparam is a-rate.
const POSITION_CHANGE_FRAME = 1111;
promise_test(function(t) {
var ac = new OfflineAudioContext(2, 2048, 44100);
var panner = ac.createPanner();
panner.positionX.value = -1;
panner.positionY.value = -1;
panner.positionZ.value = 1;
panner.positionX.setValueAtTime(1, POSITION_CHANGE_FRAME/ac.sampleRate);
var osc = ac.createOscillator();
osc.connect(panner);
panner.connect(ac.destination);
osc.start()
return ac.startRendering().then(function(buffer) {
var left = buffer.getChannelData(0);
var right = buffer.getChannelData(1);
for (var i = 0; i < 2048; ++i) {
if (i < POSITION_CHANGE_FRAME) {
assert_true(Math.abs(left[i]) >= Math.abs(right[i]), "index " + i + " should be on the left");
} else {
assert_true(Math.abs(left[i]) < Math.abs(right[i]), "index " + i + " should be on the right");
}
}
});
}, "PannerNode AudioParam automation works properly");
</script>
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