'use strict';

/*@
Ox.getVideoFormat <f> Get supported video formats
    (formats) -> <a> of supported formats
    formats <a> list of available formats
@*/
Ox.getVideoFormat = function(formats) {
    var aliases = {
            'mp4': 'h264',
            'm4v': 'h264',
            'ogv': 'ogg'
        },
        format,
        tests = {
            'h264': 'video/mp4; codecs="avc1.42E01E, mp4a.40.2"',
            'ogg': 'video/ogg; codecs="theora, vorbis"',
            'webm': 'video/webm; codecs="vp8, vorbis"'
        },
        userAgent = navigator.userAgent.toLowerCase(),
        video = document.createElement('video');
    Ox.forEach(formats, function(f) {
        var alias = aliases[f] || f;
        if (!!(video.canPlayType && video.canPlayType(tests[alias]).replace('no', ''))) {
            // disable WebM on Safari/Perian, seeking does not work
            if (!(
                alias == 'webm' && /safari/.test(userAgent)
                && !/chrome/.test(userAgent) && !/linux/.test(userAgent)
            )) {
                format = f;
                return false; // break
            }
        }
    });
    return format;
};


/*@
Ox.getVideoInfo <f>
    url <s> video url
    callback <f> gets called with object containing duration, width, height
@*/

Ox.getVideoInfo = Ox.queue(function(url, callback) {
    var video = document.createElement('video');
    video.addEventListener('loadedmetadata', function(event) {
        var info = {
            duration: this.duration,
            widht: this.videoWidth,
            height: this.videoHeight,
        };
        this.src = '';
        callback(info);
        video = null;
    });
    video.preload = 'metadata';
    video.src = url;
}, {
    maxThreads: 4
});