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Test Info:
<!DOCTYPE HTML>
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<head>
<script type="application/javascript" src="mediaStreamPlayback.js"></script>
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<pre id="test">
<script type="application/javascript">
createHTML({
title: "getUserMedia multiple times, concurrently, and with different constraints",
bug: "1404977"
});
/**
* Verify that we can successfully call getUserMedia multiple times for the
* same device, concurrently. This is checked by calling getUserMedia a number
* of times with different constraints. We verify that the stream returned by
* that call has the same constraints as requested both immediately after the
* call and after all gUM calls have been made. The test then verifies the
* streams can be played.
*/
runTest(async function() {
// Compare constraints and return a string with the differences in
// echoCancellation, autoGainControl, and noiseSuppression. The string
// will be empty if there are no differences.
function getConstraintDifferenceString(constraints, otherConstraints) {
let diffString = "";
if (constraints.echoCancellation != otherConstraints.echoCancellation) {
diffString += "echoCancellation different: " +
`${constraints.echoCancellation} != ${otherConstraints.echoCancellation}, `;
}
if (constraints.autoGainControl != otherConstraints.autoGainControl) {
diffString += "autoGainControl different: " +
`${constraints.autoGainControl} != ${otherConstraints.autoGainControl}, `;
}
if (constraints.noiseSuppression != otherConstraints.noiseSuppression) {
diffString += "noiseSuppression different: " +
`${constraints.noiseSuppression} != ${otherConstraints.noiseSuppression}, `;
}
// Replace trailing comma and space if any
return diffString.replace(/, $/, "");
}
// We need a real device to get a MediaEngine supporting constraints
let audioDevice = SpecialPowers.getCharPref("media.audio_loopback_dev", "");
if (!audioDevice) {
todo(false, "No device set by framework. Try --use-test-media-devices");
return;
}
let egn = (e, g, n) => ({
echoCancellation: e,
autoGainControl: g,
noiseSuppression: n
});
let constraintCombinations = [
egn(false, false, false),
egn(true, false, false),
egn(false, true, false),
egn(false, false, true),
egn(true, true, false),
egn(true, false, true),
egn(false, true, true),
egn(true, true, true),
];
// Array to store objects that associate information used in our test such as
// constraints, gum streams, and various promises.
let testCases = [];
for (let constraints of constraintCombinations) {
let testCase = {requestedConstraints: constraints};
// Provide an id for logging, labeling related elements.
testCase.id = `testCase.` +
`e=${constraints.echoCancellation}.` +
`g=${constraints.noiseSuppression}.` +
`n=${constraints.noiseSuppression}`;
testCases.push(testCase);
testCase.gumStream =
await getUserMedia({audio: testCase.requestedConstraints})
.catch(e => Promise.reject(`getUserMedia calls should not fail! Failed at ${testCase.id} with: ${e}!`));
let differenceString = getConstraintDifferenceString(
testCase.requestedConstraints,
testCase.gumStream.getAudioTracks()[0].getSettings());
ok(!differenceString,
`gUM stream for ${testCase.id} should have the same constraints as were ` +
`requested from gUM. Differences: ${differenceString}`);
}
is(testCases.length,
constraintCombinations.length,
"Should have a stream for each constraint");
// Once all streams are collected, make sure the constraints haven't been
// mutated by another gUM call.
for (let testCase of testCases) {
let differenceString = getConstraintDifferenceString(
testCase.requestedConstraints,
testCase.gumStream.getAudioTracks()[0].getSettings());
ok(!differenceString,
`gUM stream for ${testCase.id} should not have had constraints altered after ` +
`all gUM calls are done. Differences: ${differenceString}`);
}
// We do not currently have tests to verify the behaviour of the different
// constraints. Once we do we should do further verificaiton here. See
for (let testCase of testCases) {
let testAudio = createMediaElement("audio", `testAudio.${testCase.id}`);
let playback = new MediaStreamPlayback(testAudio, testCase.gumStream);
await playback.playMediaWithoutStoppingTracks(false);
}
// Stop the tracks for each stream, we left them running above via
// playMediaWithoutStoppingTracks to make sure they can play concurrently.
for (let testCase of testCases) {
testCase.gumStream.getTracks().map(t => t.stop());
}
});
</script>
</pre>
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