<!DOCTYPE html>
<html>
<head>
    <title>media-source-timestampoffset-then-zero</title>
    <script src="mock-media-source.js"></script>
    <script src="../video-test.js"></script>
    <script>
    var source;
    var sourceBuffer;
    var bufferedSamples;

    if (window.internals)
        internals.initializeMockMediaSource();

    function makeSimpleAudio(start, end, generation) {
        const init = makeAInit(2, [makeATrack(1, 'mock', TRACK_KIND.VIDEO)]);

        const samples = [];
        for (let time = start; time < end; time++)
            samples.push(makeASample(time, time, 1, 1, 1, SAMPLE_FLAG.SYNC, generation));

        return concatenateSamples([init].concat(samples));
    }

    window.addEventListener('load', async () => {
        findMediaElement();
        source = new MediaSource();
        testExpected('source.readyState', 'closed');
        const sourceOpened = waitFor(source, 'sourceopen');

        const videoSource = document.createElement('source');
        videoSource.type = 'audio/mock; codecs=mock';
        videoSource.src = URL.createObjectURL(source);
        video.appendChild(videoSource);

        await sourceOpened;
        run('sourceBuffer = source.addSourceBuffer("video/mock; codecs=mock")');

        run('sourceBuffer.timestampOffset = 5');
        run('sourceBuffer.appendBuffer(makeSimpleAudio(0, 20, 0))');
        await waitFor(sourceBuffer, 'updateend');

        bufferedSamples = internals.bufferedSamplesForTrackID(sourceBuffer, 1);
        consoleWrite("After first append:");
        bufferedSamples.forEach(consoleWrite);

        run('sourceBuffer.timestampOffset = 0');
        run('sourceBuffer.appendBuffer(makeSimpleAudio(0, 20, 1))');
        await waitFor(sourceBuffer, 'updateend');

        bufferedSamples = internals.bufferedSamplesForTrackID(sourceBuffer, 1);
        consoleWrite("After second append:");
        bufferedSamples.forEach(consoleWrite);

        endTest();
    });
    </script>
</head>
<body>
    <video controls></video>
</body>
</html>