<!DOCTYPE html>
<html>
<head>
    <title>media-source-timestampoffset-trim</title>
    <script src="media-source-loader.js"></script>
    <script src="../video-test.js"></script>
    <script>
    var loader;
    var source;
    var sourceBuffer;

    const framesInAACPacket = 1024;
    const sampleRate = 48000;
    const totalFramesInSegment = 47;
    const framesToBeDroppedBeginning = 5;
    const framesToBeDroppedEnd = 5;

    function resetSourceBuffer() {
        run('sourceBuffer.timestampOffset = 0');
        run('sourceBuffer.appendWindowStart = 0');
        run('sourceBuffer.appendWindowEnd = Infinity');
    }

    function runTest() {
        findMediaElement();

        loader = new MediaSourceLoader('content/test-48khz-manifest.json');
        loader.onerror = () => {
            failTest('Media data loading failed');
        };
        loader.onload = async () => {
            waitForEventAndFail('error');

            source = new MediaSource();
            run('video.src = URL.createObjectURL(source)');
            await waitFor(source, 'sourceopen');

            run('sourceBuffer = source.addSourceBuffer(loader.type())');
            run('sourceBuffer.appendBuffer(loader.initSegment())');
            await waitFor(sourceBuffer, 'update');

            // We want the first framesToBeDroppedBeginning frames to be dropped, and only those.
            run('sourceBuffer.timestampOffset = -(framesToBeDroppedBeginning * framesInAACPacket) / sampleRate');
            consoleWrite('Append a media segment negative offset.')
            run('sourceBuffer.appendBuffer(loader.mediaSegment(0))');
            await waitFor(sourceBuffer, 'update');

            testExpected('sourceBuffer.buffered.length', 1);
            testExpected('sourceBuffer.buffered.start(0)', 0);
            testExpected('sourceBuffer.buffered.end(0)'  , ((totalFramesInSegment - framesToBeDroppedBeginning) * framesInAACPacket) / sampleRate);
            run('sourceBuffer.remove(0, Infinity)');
            await waitFor(sourceBuffer, 'update');

            resetSourceBuffer();
            // We want the first framesToBeDroppedBeginning frames to be dropped, and only those.
            run('sourceBuffer.appendWindowStart = (framesToBeDroppedBeginning * framesInAACPacket) / sampleRate');
            consoleWrite('Append a media segment with appendWindowStart set.')
            run('sourceBuffer.appendBuffer(loader.mediaSegment(0))');
            await waitFor(sourceBuffer, 'update');

            testExpected('sourceBuffer.buffered.length', 1);
            testExpected('sourceBuffer.buffered.start(0)', (framesToBeDroppedBeginning * framesInAACPacket) / sampleRate);
            testExpected('sourceBuffer.buffered.end(0)'  , (totalFramesInSegment * framesInAACPacket) / sampleRate);
            run('sourceBuffer.remove(0, Infinity)');
            await waitFor(sourceBuffer, 'update');

            resetSourceBuffer();
            // We want the last framesToBeDroppedEnd frames to be dropped, and only those.
            run('sourceBuffer.appendWindowEnd = ((totalFramesInSegment - framesToBeDroppedEnd) * framesInAACPacket) / sampleRate');
            consoleWrite('Append a media segment with appendWindowEnd set.')
            run('sourceBuffer.appendBuffer(loader.mediaSegment(0))');
            await waitFor(sourceBuffer, 'update');

            testExpected('sourceBuffer.buffered.length', 1);
            testExpected('sourceBuffer.buffered.start(0)', 0);
            testExpected('sourceBuffer.buffered.end(0)'  , ((totalFramesInSegment - framesToBeDroppedEnd) * framesInAACPacket) / sampleRate);

            endTest();
        };
    }
    </script>
</head>
<body onload="runTest()">
    <div>
        This tests that audio samples outside the appendWindow's interval are properly ignored.
    </div>
    <video controls></video>
</body>
</html>