<html>
    <title>Test of concurrent HTML5 audio</title>
    <body>

    <p>Test that multiple audio elements can play concurrently.</p>

    <script src=video-test.js></script>
    <script src=media-file.js></script>
    <script>
        var maxPlayers = 2; // Number of concurrent audio elements to test. For larger values a longer media file is needed.
        var timeupdateEventCount = 0;
        var audioElementCount = 0;

        function errorListener(event)
        {
             logResult(false, "Element " + audioElementCount + " caught 'error' event, audio.error.code = " + this.error.code);
             endTest();
        }

        function canplaythroughListener(event)
        {
             consoleWrite("EVENT(" + audioElementCount + ", canplaythrough)");
             testElement = this;
             testExpected(audioElementCount + ", testElement.currentTime", 0);
             this.play();
        }

        function playingListener(event)
        {
             consoleWrite("EVENT(" + audioElementCount + ", playing)");
        }

        function timeupdateListener(event)
        {
            ++timeupdateEventCount;

            // wait 2 timeupdate events so we are sure the media engine is
            // playing the media.
            if (timeupdateEventCount >= 2) {
                // make sure time is advancing
                testElement = this;
                testExpected(audioElementCount + ", testElement.currentTime", 0, '>');
                this.removeEventListener('timeupdate', timeupdateListener);
                if (++audioElementCount >= maxPlayers) {
                    // All audio elements have been started playing. Make sure
                    // all of them are still playing.
                    consoleWrite("Making sure all " + maxPlayers + " audio elements are in playing state:");
                    for (var i = 0; i < maxPlayers; i++) {
                        testElement = document.getElementsByTagName('audio')[i];
                        testExpected(i + ", testElement.paused", false);
                    }
                    endTest();
                } else {
                    // Start the next audio element
                    testAudioElement(audioElementCount);
                }
            }
        }

        function testAudioElement(count)
        {
            var audioElement = document.getElementsByTagName('audio')[count];
            audioElement.addEventListener('error', errorListener);
            audioElement.addEventListener('canplaythrough', canplaythroughListener);
            timeupdateEventCount = 0;
            audioElement.addEventListener('timeupdate', timeupdateListener);
            audioElement.addEventListener('playing', playingListener);
            audioElement.src = findMediaFile("audio", "content/silence");
        }

        consoleWrite("Starting a total of " + maxPlayers + " concurrent audio elements.");
        for (var i = 0; i < maxPlayers; i++)
            document.write("<audio controls></audio>");

        testAudioElement(0);
    </script>

    </body>
</html>