[Webkit-unassigned] [Bug 271227] New: AudioContext attached nodes can be collected

Tue Mar 19 02:52:02 PDT 2024

https://bugs.webkit.org/show_bug.cgi?id=271227

            Bug ID: 271227
           Summary: AudioContext attached nodes can be collected
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: youennf at gmail.com

AudioContext attached nodes can be collected, which can have an impact on audio rendering/now playing info.
For instance in current LayoutTests/media/now-playing-webaudio.html:
<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Testing basic video exchange from offerer to receiver</title>
        <script src="../resources/testharness.js"></script>
        <script src="../resources/testharnessreport.js"></script>
    </head>
    <body>
        <script>
function waitFor(delay)
{
    return new Promise(resolve => setTimeout(resolve, delay));
}

async function waitForCriteria(test, criteria)
{
    let counter = 0;
    while (!criteria() && ++counter < 100)
        await waitFor(50);
}

promise_test(async test => {
    if (!window.internals)
        return;

    navigator.audioSession.type = "playback";

    let context = new AudioContext();

    await waitFor(100);
    assert_false(!!internals.nowPlayingState.uniqueIdentifier);

    let oscillator = null;
    let gainNode = context.createGain();
    oscillator = context.createOscillator();
    oscillator.type = 'square';
    oscillator.frequency.setValueAtTime(440, context.currentTime);

    oscillator.connect(gainNode);
    gainNode.gain.value = 0.1

    internals.withUserGesture(() => {
        context.resume();
    });

    await waitFor(100);
    assert_false(!!internals.nowPlayingState.uniqueIdentifier);

    gainNode.connect(context.destination);

    await waitForCriteria(test, () => {
        return !!internals.nowPlayingState.uniqueIdentifier;
    });
    assert_true(!!internals.nowPlayingState.uniqueIdentifier, "active now playing");

    context.suspend();

    await waitForCriteria(test, () => {
        return !internals.nowPlayingState.uniqueIdentifier;
    });
    assert_false(!!internals.nowPlayingState.uniqueIdentifier, "inactive now playing");

    context.resume();

    await waitForCriteria(test, () => {
        return !!internals.nowPlayingState.uniqueIdentifier;
    });
    assert_true(!!internals.nowPlayingState.uniqueIdentifier, "active now playing again");
}, "AudioContext as the now playing info source");

promise_test(async test => {
    if (!window.internals)
        return;

    const identifier = internals.nowPlayingState.uniqueIdentifier;
    let mediaElement = document.createElement("audio");
    document.body.appendChild(mediaElement);

    await waitFor(100);
    assert_equals(internals.nowPlayingState.uniqueIdentifier, identifier, "AudioContext identifier");

    await waitFor(100);
    assert_equals(internals.nowPlayingState.uniqueIdentifier, identifier, "AudioContext identifier 2");

    mediaElement.src = "content/test.wav";

    await waitForCriteria(test, () => {
        return internals.nowPlayingState.uniqueIdentifier !== identifier;
    });
    assert_not_equals(internals.nowPlayingState.uniqueIdentifier, identifier, "HTMLMediaElement identifier");
    const mediaElementIdentifier = internals.nowPlayingState.uniqueIdentifier

    document.body.removeChild(mediaElement);

    await waitForCriteria(test, () => {
        return internals.nowPlayingState.uniqueIdentifier !== mediaElementIdentifier;
    });
    assert_equals(internals.nowPlayingState.uniqueIdentifier, identifier, "AudioContext identifier 3");
}, "HTMLMediaElement will become the now playing info source over playing AudioContext");

        </script>
    </body>
</html>

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20240319/fcdcd54f/attachment.htm>