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<!DOCTYPE html>
<head>
<title>Test AudioContext.setSinkId() state change</title>
</head>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<script>
"use strict";
const audioContext = new AudioContext();
let outputDeviceList = null;
let firstDeviceId = null;
// Setup: Get permission via getUserMedia() and a list of audio output devices.
promise_setup(async t => {
await navigator.mediaDevices.getUserMedia({ audio: true });
const deviceList = await navigator.mediaDevices.enumerateDevices();
outputDeviceList =
deviceList.filter(({kind}) => kind === 'audiooutput');
assert_greater_than(outputDeviceList.length, 1,
'the system must have more than 1 device.');
firstDeviceId = outputDeviceList[1].deviceId;
}, 'Get permission via getUserMedia() and a list of audio output devices.');
// Test the sink change when from a suspended context.
promise_test(async t => {
let events = [];
await audioContext.suspend();
// Step 6. Set wasRunning to false if the [[rendering thread state]] on the
// AudioContext is "suspended".
assert_equals(audioContext.state, 'suspended');
// Step 11.5. Fire an event named sinkchange at the associated AudioContext.
audioContext.onsinkchange = t.step_func(() => {
events.push('sinkchange');
assert_equals(audioContext.sinkId, firstDeviceId);
});
await audioContext.setSinkId(firstDeviceId);
assert_equals(events[0], 'sinkchange');
t.done();
}, 'Calling setSinkId() on a suspended AudioContext should fire only sink ' +
'change events.');
// Test the sink change when from a running context.
promise_test(async t => {
let events = [];
await audioContext.resume();
// Step 9. If wasRunning is true:
assert_equals(audioContext.state, 'running');
// Step 9.2.1. Set the state attribute of the AudioContext to "suspended".
// Fire an event named statechange at the associated AudioContext.
audioContext.onstatechange = t.step_func(() => {
events.push('statechange:suspended');
assert_equals(audioContext.state, 'suspended');
});
// Step 11.5. Fire an event named sinkchange at the associated AudioContext.
audioContext.onsinkchange = t.step_func(() => {
events.push('sinkchange');
assert_equals(audioContext.sinkId, firstDeviceId);
});
// Step 12.2. Set the state attribute of the AudioContext to "running".
// Fire an event named statechange at the associated AudioContext.
audioContext.onstatechange = t.step_func(() => {
events.push('statechange:running');
assert_equals(audioContext.state, 'running');
});
await audioContext.setSinkId(firstDeviceId);
assert_equals(events.length, 3);
assert_equals(events[0], 'statechange:suspended');
assert_equals(events[1], 'sinkchange');
assert_equals(events[2], 'statechange:running');
t.done();
}, 'Calling setSinkId() on a running AudioContext should fire both state ' +
'and sink change events.');
</script>
</html>
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