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/**
* @file text-track-list-converter.js Utilities for capturing text track state and
* re-creating tracks based on a capture.
*
* @module text-track-list-converter
*/
/** @import Tech from '../tech/tech' */
/**
* Examine a single {@link TextTrack} and return a JSON-compatible javascript object that
* represents the {@link TextTrack}'s state.
*
* @param {TextTrack} track
* The text track to query.
*
* @return {Object}
* A serializable javascript representation of the TextTrack.
* @private
*/
const trackToJson = function(track) {
const ret = [
'kind', 'label', 'language', 'id',
'inBandMetadataTrackDispatchType', 'mode', 'src'
].reduce((acc, prop, i) => {
if (track[prop]) {
acc[prop] = track[prop];
}
return acc;
}, {
cues: track.cues && Array.prototype.map.call(track.cues, function(cue) {
return {
startTime: cue.startTime,
endTime: cue.endTime,
text: cue.text,
id: cue.id
};
})
});
return ret;
};
/**
* Examine a {@link Tech} and return a JSON-compatible javascript array that represents the
* state of all {@link TextTrack}s currently configured. The return array is compatible with
* {@link text-track-list-converter:jsonToTextTracks}.
*
* @param {Tech} tech
* The tech object to query
*
* @return {Array}
* A serializable javascript representation of the {@link Tech}s
* {@link TextTrackList}.
*/
const textTracksToJson = function(tech) {
const trackEls = tech.$$('track');
const trackObjs = Array.prototype.map.call(trackEls, (t) => t.track);
const tracks = Array.prototype.map.call(trackEls, function(trackEl) {
const json = trackToJson(trackEl.track);
if (trackEl.src) {
json.src = trackEl.src;
}
return json;
});
return tracks.concat(Array.prototype.filter.call(tech.textTracks(), function(track) {
return trackObjs.indexOf(track) === -1;
}).map(trackToJson));
};
/**
* Create a set of remote {@link TextTrack}s on a {@link Tech} based on an array of javascript
* object {@link TextTrack} representations.
*
* @param {Array} json
* An array of `TextTrack` representation objects, like those that would be
* produced by `textTracksToJson`.
*
* @param {Tech} tech
* The `Tech` to create the `TextTrack`s on.
*/
const jsonToTextTracks = function(json, tech) {
json.forEach(function(track) {
const addedTrack = tech.addRemoteTextTrack(track).track;
if (!track.src && track.cues) {
track.cues.forEach((cue) => addedTrack.addCue(cue));
}
});
return tech.textTracks();
};
export default {textTracksToJson, jsonToTextTracks, trackToJson};
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