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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This file performs actions on media elements.
(function() {
function seekMedia(selector, seekTime, logSeekTime, seekLabel) {
// Performs the "Seek" action on media satisfying selector.
var mediaElements = window.__findMediaElements(selector);
for (var i = 0; i < mediaElements.length; i++) {
if (mediaElements[i] instanceof HTMLMediaElement)
seekHTML5Element(mediaElements[i], seekTime, logSeekTime, seekLabel);
else
throw new Error('Can not seek non HTML5 media elements.');
}
}
function seekHTML5Element(element, seekTime, logSeekTime, seekLabel) {
function readyForSeek() {
seekHTML5ElementPostLoad(element, seekTime, logSeekTime, seekLabel);
}
if (element.readyState == element.HAVE_NOTHING) {
var onLoadedMetaData = function(e) {
element.removeEventListener('loadedmetadata', onLoadedMetaData);
readyForSeek();
};
element.addEventListener('loadedmetadata', onLoadedMetaData);
element.load();
} else {
readyForSeek();
}
}
function seekHTML5ElementPostLoad(element, seekTime, logSeekTime, seekLabel) {
// Reset seek completion since multiple seeks can run on same media element.
element['seeked_completed'] = false;
window.__registerHTML5ErrorEvents(element);
window.__registerHTML5EventCompleted(element, 'seeked');
if (logSeekTime) {
var willSeekEvent = document.createEvent('Event');
willSeekEvent.initEvent('willSeek', false, false);
if (seekLabel)
willSeekEvent.seekLabel = seekLabel;
else
willSeekEvent.seekLabel = seekTime;
element.dispatchEvent(willSeekEvent);
}
try {
element.currentTime = seekTime;
} catch (err) {
throw new Error('Cannot seek in network state: ' + element.networkState);
}
}
window.__seekMedia = seekMedia;
})();
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