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MediaRecorder-stop.html
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MediaRecorder-stop.html
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<!doctype html>
<html>
<head>
<title>MediaRecorder Stop</title>
<link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#mediarecorder">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<canvas id="canvas" width="200" height="200">
</canvas>
<script>
function createVideoStream() {
let canvas = document.getElementById("canvas");
canvas.getContext('2d');
return canvas.captureStream();
}
function recordEvents(target, events) {
let arr = [];
for (let ev of events) {
target.addEventListener(ev, _ => arr.push(ev));
}
return arr;
}
// This function is used to check that elements of |actual| is a sub
// sequence in the |expected| sequence.
function assertSequenceIn(actual, expected) {
let i = 0;
for (event of actual) {
const j = expected.slice(i).indexOf(event);
assert_greater_than_equal(
j, 0, "Sequence element " + event + " is not included in " +
expected.slice(i));
i = j;
}
return true;
}
promise_test(async t => {
let video = createVideoStream();
let recorder = new MediaRecorder(video);
let events = recordEvents(recorder,
["start", "stop", "dataavailable", "pause", "resume", "error"]);
assert_equals(video.getVideoTracks().length, 1, "video mediastream starts with one track");
recorder.start();
assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
video.getVideoTracks()[0].stop();
assert_equals(recorder.state, "recording", "MediaRecorder state should be recording immediately following last track ending");
let event = await new Promise(r => recorder.onstop = r);
assert_equals(event.type, "stop", "the event type should be stop");
assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
assert_equals(recorder.state, "inactive", "MediaRecorder is inactive after stop event");
// As the test is written, it's not guaranteed that
// onstart/ondataavailable is invoked, but it's fine if they are.
// The stop element is guaranteed to be in events when we get here.
assertSequenceIn(events, ["start", "dataavailable", "stop"]);
}, "MediaRecorder will stop recording and fire a stop event when all tracks are ended");
promise_test(async t => {
let video = createVideoStream();
let recorder = new MediaRecorder(video);
let events = recordEvents(recorder,
["start", "stop", "dataavailable", "pause", "resume", "error"]);
recorder.start();
assert_equals(recorder.state, "recording", "MediaRecorder has been started successfully");
recorder.stop();
assert_equals(recorder.state, "inactive", "MediaRecorder state should be inactive immediately following stop() call");
let event = await new Promise (r => recorder.onstop = r);
assert_equals(event.type, "stop", "the event type should be stop");
assert_true(event.isTrusted, "isTrusted should be true when the event is created by C++");
assert_equals(recorder.state, "inactive", "MediaRecorder is inactive after stop event");
// As the test is written, it's not guaranteed that
// onstart/ondataavailable is invoked, but it's fine if they are.
// The stop element is guaranteed to be in events when we get here.
assertSequenceIn(events, ["start", "dataavailable", "stop"]);
}, "MediaRecorder will stop recording and fire a stop event when stop() is called");
promise_test(async t => {
const recorder = new MediaRecorder(createVideoStream());
assert_throws_dom("InvalidStateError", () => { recorder.stop(); });
await Promise.race([
new Promise((_, reject) => recorder.onstop =
_ => reject(new Error("onstop should never have been called"))),
new Promise(r => t.step_timeout(r, 0))]);
}, "MediaRecorder will fire an exception when stopped after creation");
promise_test(async t => {
const recorder = new MediaRecorder(createVideoStream());
recorder.start();
recorder.stop();
let event = await new Promise(r => recorder.onstop = r);
assert_throws_dom("InvalidStateError", () => { recorder.stop(); });
await Promise.race([
new Promise((_, reject) => recorder.onstop =
_ => reject(new Error("onstop should never have been called"))),
new Promise(r => t.step_timeout(r, 0))]);
}, "MediaRecorder will fire an exception when stopped after having just been stopped");
promise_test(async t => {
const stream = createVideoStream();
const recorder = new MediaRecorder(stream);
recorder.start();
stream.getVideoTracks()[0].stop();
let event = await new Promise(r => recorder.onstop = r);
assert_throws_dom("InvalidStateError", () => { recorder.stop(); });
await Promise.race([
new Promise((_, reject) => recorder.onstop =
_ => reject(new Error("onstop should never have been called"))),
new Promise(r => t.step_timeout(r, 0))]);
}, "MediaRecorder will fire an exception when stopped after having just been spontaneously stopped");
</script>
</body>
</html>