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Test Info: Warnings
- This test has a WPT meta file that expects 2 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /webaudio/the-audio-api/the-audiocontext-interface/audiocontext-sinkid-state-change.https.html - WPT Dashboard Interop Dashboard
<!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";
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 = [];
const audioContext = new AudioContext();
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 on a running AudioContext.
promise_test(async t => {
let events = [];
let silentSinkOption = {type: 'none'};
const audioContext = new AudioContext();
// Make sure the context is "running". This also will fire a state change
// event upon resolution.
await audioContext.resume();
return new Promise(async resolve => {
function eventCheckpoint() {
// We're expecting 4 events from AudioContext.
if (events.length === 4) {
// The initial context state was "running".
assert_equals(events[0], 'statechange:running');
assert_equals(events[1], 'statechange:suspended');
assert_equals(events[2], 'sinkchange');
assert_equals(events[3], 'statechange:running');
resolve();
}
}
// This is to catch a sink change event:
// - Step 11.5. Fire an event named sinkchange at the associated
// AudioContext.
audioContext.onsinkchange = t.step_func(() => {
assert_equals(audioContext.sinkId.type, silentSinkOption.type);
events.push('sinkchange');
eventCheckpoint();
});
// The following event handler will catch 3 state change events:
// - The initial 'running' state change.
// - Step 9.2.1. Set the state attribute of the AudioContext to "suspended".
// Fire an event named statechange at the associated AudioContext.
// - Step 12.2. Set the state attribute of the AudioContext to "running".
// Fire an event named statechange at the associated AudioContext.
audioContext.onstatechange = async () => {
events.push(`statechange:${audioContext.state}`);
eventCheckpoint();
};
// To trigger a series of state changes, we need a device change. The
// context started with the default device, and this call changes it to a
// silent sink.
audioContext.setSinkId(silentSinkOption);
});
}, 'Calling setSinkId() on a running AudioContext should fire both state ' +
'and sink change events.');
</script>
</html>