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<!doctype html>
<html>
<head>
<title>MediaRecorder MIMEType</title>
<link rel="help" href="https://w3c.github.io/mediacapture-record/MediaRecorder.html#dom-mediarecorder-mimetype">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<canvas id="canvas" width="200" height="200">
</canvas>
<script>
function createAudioStream(t) {
const ac = new AudioContext();
const dest = ac.createMediaStreamDestination();
const osc = ac.createOscillator();
osc.connect(dest);
osc.start();
const [track] = dest.stream.getTracks();
t.add_cleanup(() => track.stop());
return dest.stream;
}
function createVideoStream(t) {
const canvas = document.getElementById("canvas");
const ctx = canvas.getContext('2d');
const stream = canvas.captureStream();
const [track] = stream.getTracks();
t.add_cleanup(() => track.stop());
ctx.fillStyle = 'green';
requestAnimationFrame(function draw() {
ctx.fillRect(0, 0, canvas.width, canvas.height);
if (track.readyState == "live") {
requestAnimationFrame(draw);
}
});
return stream;
}
function createAudioVideoStream(t) {
return new MediaStream([
...createAudioStream(t).getTracks(),
...createVideoStream(t).getTracks(),
]);
}
test(t => {
const recorder = new MediaRecorder(createAudioStream(t));
assert_equals(recorder.mimeType, "",
"MediaRecorder has no default MIMEtype");
}, "MediaRecorder sets no default MIMEType in the constructor for audio");
test(t => {
const recorder = new MediaRecorder(createVideoStream(t));
assert_equals(recorder.mimeType, "",
"MediaRecorder has no default MIMEtype");
}, "MediaRecorder sets no default MIMEType in the constructor for video");
test(t => {
const stream = createAudioVideoStream(t);
const recorder = new MediaRecorder(stream);
assert_equals(recorder.mimeType, "",
"MediaRecorder has no default MIMEtype");
}, "MediaRecorder sets no default MIMEType in the constructor for audio/video");
test(t => {
assert_throws("NotSupportedError",
() => new MediaRecorder(new MediaStream(), {mimeType: "audio/banana"}));
}, "MediaRecorder invalid audio MIMEType throws");
test(t => {
assert_false(MediaRecorder.isTypeSupported("audio/banana"));
}, "MediaRecorder invalid audio MIMEType is unsupported");
test(t => {
assert_throws("NotSupportedError",
() => new MediaRecorder(new MediaStream(), {mimeType: "video/pineapple"}));
}, "MediaRecorder invalid video MIMEType throws");
test(t => {
assert_false(MediaRecorder.isTypeSupported("video/pineapple"));
}, "MediaRecorder invalid video MIMEType is unsupported");
// New MIME types could be added to this list as needed.
for (const mimeType of [
'audio/mp4',
'video/mp4',
'audio/ogg',
'audio/ogg; codecs="vorbis"',
'audio/ogg; codecs="opus"',
'audio/webm',
'audio/webm; codecs="vorbis"',
'audio/webm; codecs="opus"',
'video/webm',
'video/webm; codecs="vp8"',
'video/webm; codecs="vp8, vorbis"',
'video/webm; codecs="vp8, opus"',
'video/webm; codecs="vp9"',
'video/webm; codecs="vp9, vorbis"',
'video/webm; codecs="vp9, opus"',
'video/webm; codecs="av1"',
'video/webm; codecs="av1, opus"',
]) {
if (MediaRecorder.isTypeSupported(mimeType)) {
test(t => {
const recorder = new MediaRecorder(new MediaStream(), {mimeType});
assert_equals(recorder.mimeType, mimeType, "Supported MIMEType is set");
}, `Supported MIMEType ${mimeType} is set immediately after constructing`);
} else {
test(t => {
assert_throws("NotSupportedError",
() => new MediaRecorder(new MediaStream(), {mimeType}));
}, `Unsupported MIMEType ${mimeType} throws`);
}
}
promise_test(async t => {
const recorder = new MediaRecorder(createAudioStream(t));
recorder.start();
assert_equals(recorder.mimeType, "",
"MediaRecorder has no MIMEtype after start() for audio");
await new Promise(r => recorder.onstart = r);
assert_not_equals(recorder.mimeType, "",
"MediaRecorder has a MIMEtype after 'start' for audio");
assert_regexp_match(recorder.mimeType, /^audio\//,
"MIMEtype has an expected media type");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+/,
"MIMEtype has a container subtype");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+; codecs=[^,]+$/,
"MIMEtype has one codec");
}, "MediaRecorder sets a MIMEType after 'start' for audio");
promise_test(async t => {
const recorder = new MediaRecorder(createVideoStream(t));
recorder.start();
assert_equals(recorder.mimeType, "",
"MediaRecorder has no MIMEtype after start() for video");
await new Promise(r => recorder.onstart = r);
assert_not_equals(recorder.mimeType, "",
"MediaRecorder has a MIMEtype after 'start' for video");
assert_regexp_match(recorder.mimeType, /^video\//,
"MIMEtype has an expected media type");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+/,
"MIMEtype has a container subtype");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+; codecs=[^,]+$/,
"MIMEtype has one codec");
}, "MediaRecorder sets a MIMEType after 'start' for video");
promise_test(async t => {
const recorder = new MediaRecorder(createAudioVideoStream(t));
recorder.start();
assert_equals(recorder.mimeType, "",
"MediaRecorder has no MIMEtype after start() for audio/video");
await new Promise(r => recorder.onstart = r);
assert_not_equals(recorder.mimeType, "",
"MediaRecorder has a MIMEtype after 'start' for audio/video");
assert_regexp_match(recorder.mimeType, /^video\//,
"MIMEtype has an expected media type");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+/,
"MIMEtype has a container subtype");
assert_regexp_match(recorder.mimeType, /^[a-z]+\/[a-z]+; codecs=[^,]+,[^,]+$/,
"MIMEtype has two codecs");
}, "MediaRecorder sets a MIMEType after 'start' for audio/video");
</script>
</body>
</html>
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