
<!doctype html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Don't unmute video when a tab becomes visible unless it was muted when the tab was hidden</title>
        <script src="../../../resources/testharness.js"></script>
        <script src="../../../resources/testharnessreport.js"></script>
    </head>
    <body>
        <script>
            let audioTrack;
            let videoTrack;

            async function validateMediaStreamTrackIsGeneratingContent(track)
            {
                if (!window.internals)
                    return true;
                internals.observeMediaStreamTrack(track);
                let count = 100;
                do {
                    await new Promise(resolve => setTimeout(resolve, 50));
                    if (internals.trackAudioSampleCount || internals.trackVideoSampleCount)
                        return true;
                } while (--count > 0);
                return false;
            }

            promise_test((t) => {
                if (window.testRunner)
                    testRunner.setUserMediaPermission(true);
                if (!window.internals)
                    return Promise.reject("this test needs internals API");

                return navigator.mediaDevices.getUserMedia({ audio: true, video: true }).then((stream) => {
                    audioTrack = stream.getAudioTracks()[0];
                    videoTrack = stream.getVideoTracks()[0];

                    assert_false(audioTrack.muted, "audio track is active");
                    assert_false(videoTrack.muted, "video track is active");
                })
            }, "Setup stream");

            promise_test(async (t) => {
                if (window.internals)
                    window.internals.setPageVisibility(false);
                assert_false(audioTrack.muted, "audio track is active");
                assert_true(videoTrack.muted, "video track is muted");
            }, "Hide page, only video should be muted");

            promise_test(async (t) => {
                if (window.internals)
                    window.internals.setPageVisibility(true);
                assert_false(audioTrack.muted, "audio track is active");
                assert_false(videoTrack.muted, "video track is active");

                assert_true(await validateMediaStreamTrackIsGeneratingContent(audioTrack), "audio track");
                assert_true(await validateMediaStreamTrackIsGeneratingContent(videoTrack), "video track");
            }, "Show page, video and audio should be unmuted");

            promise_test(async (t) => {
                if (window.internals) {
                    window.internals.setPageVisibility(false);
                    window.internals.setPageMuted("capturedevices");
                }
                assert_true(audioTrack.muted, "audio track is muted");
                assert_true(videoTrack.muted, "video track is muted");
            }, "Hide and mute page, video and audio should be muted");

            promise_test(async (t) => {
                if (window.internals)
                    window.internals.setPageVisibility(true);
                assert_true(audioTrack.muted, "audio track is muted");
                assert_true(videoTrack.muted, "video track is muted");
            }, "Show page, video and audio should remain muted");
        </script>
    </body>
</html>