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/**
* Returns the URL of a supported video source based on the user agent
* @param {string} base - media URL without file extension
* @returns {string}
*/
function getVideoURI(base)
{
var extension = '.mp4';
var videotag = document.createElement("video");
if ( videotag.canPlayType )
{
if (videotag.canPlayType('video/webm; codecs="vp9, opus"') )
{
extension = '.webm';
}
}
return base + extension;
}
/**
* Returns the URL of a supported audio source based on the user agent
* @param {string} base - media URL without file extension
* @returns {string}
*/
function getAudioURI(base)
{
var extension = '.mp3';
var audiotag = document.createElement("audio");
if ( audiotag.canPlayType &&
audiotag.canPlayType('audio/ogg') )
{
extension = '.oga';
}
return base + extension;
}
/**
* Returns the MIME type for a media URL based on the file extension.
* @param {string} url
* @returns {string}
*/
function getMediaContentType(url) {
var extension = new URL(url, location).pathname.split(".").pop();
var map = {
"mp4" : "video/mp4",
"webm": "video/webm",
"mp3" : "audio/mp3",
"oga" : "application/ogg",
};
return map[extension];
}