<!DOCTYPE html>
<html>
    <head>
        <title>test playbackRate and defaultPlaybackRate</title>
        <script src=media-file.js></script>
        <script src=video-test.js></script>
        <script>
            var wallClockAtFirstTimeUpdate;
            var mediaTimeAtFirstTimeUpdate;
            var effectivePlaybackRate;

            function start()
            {
                findMediaElement();
                waitForEvent('canplaythrough', canplaythrough);
                run('video.defaultPlaybackRate = 0.5');
                setSrcByTagName('video', findMediaFile('video', 'content/test'));
            }

            function canplaythrough()
            {
                testExpected('video.playbackRate', 0.5);
                testExpected('video.defaultPlaybackRate', 0.5);

                waitForEvent('timeupdate', timeupdate);
                video.play();
            }

            function timeupdate()
            {
                var now = Date.now() / 1000;
                if (!wallClockAtFirstTimeUpdate) {
                    wallClockAtFirstTimeUpdate = now;
                    mediaTimeAtFirstTimeUpdate = video.currentTime;
                    return;
                }

                if (wallClockAtFirstTimeUpdate == now)
                    return;

                var wallClockDelta = wallClockAtFirstTimeUpdate - now;
                var mediaTimeDelta = mediaTimeAtFirstTimeUpdate - video.currentTime;
                effectivePlaybackRate = mediaTimeDelta / wallClockDelta;

                testExpected('effectivePlaybackRate', .75, '<');
                endTest();
            }

        </script>
    </head>

    <body onload="start()">
        <video controls></video>
    </body>
</html>