rx-player
Version:
Canal+ HTML5 Video Player
101 lines (100 loc) • 3.35 kB
JavaScript
/**
* Copyright 2015 CANAL+ Group
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import parseTimestamp from "./parse_timestamp";
/**
* Parse the settings part of a cue, into key-value object.
* @param {string} settingsString
* @returns {Object}
*/
function parseSettings(settingsString) {
const splittedSettings = settingsString.split(/ |\t/);
return splittedSettings.reduce((acc, setting) => {
const splittedSetting = setting.split(":");
if (splittedSetting.length === 2) {
acc[splittedSetting[0]] = splittedSetting[1];
}
return acc;
}, {});
}
/**
* Parse the line containing the timestamp and settings in a cue.
* The returned object has the following properties:
* - start {Number}: start of the cue, in seconds
* - end {Number}: end of the cue, in seconds
* - settings {Object}: settings for the cue as a key-value object.
* @param {string} timeString
* @returns {Object|null}
*/
function parseTimeAndSettings(timeString) {
// RegExp for the timestamps + settings line.
// Capture groups:
// 1 -> start timestamp
// 2 -> end timestamp
// 3 - settings
const lineRegex = /^([\d:.]+)[ |\t]+-->[ |\t]+([\d:.]+)[ |\t]*(.*)$/;
const matches = lineRegex.exec(timeString);
if (matches === null) {
return null;
}
const start = parseTimestamp(matches[1]);
const end = parseTimestamp(matches[2]);
if (start === undefined || end === undefined) {
return null;
}
const settings = parseSettings(matches[3]);
return { start, end, settings };
}
/**
* Parse cue block into a cue object which contains:
* - start {number}: the start of the cue as a timestamp in seconds
* - end {number}: the end of the cue as a timestamp in seconds
* - header {string|undefined}: The optional cue identifier
* - payload {Array.<string>}: the payload of the cue
* @param {Array.<string>} cueLines
* @param {Number} timeOffset
* @returns {Object}
*/
export default function parseCueBlock(cueLines, timeOffset) {
const timingRegexp = /-->/;
let timeString;
let payload;
let header;
if (!timingRegexp.test(cueLines[0])) {
if (!timingRegexp.test(cueLines[1])) {
// not a cue
return null;
}
header = cueLines[0];
timeString = cueLines[1];
payload = cueLines.slice(2, cueLines.length);
}
else {
timeString = cueLines[0];
payload = cueLines.slice(1, cueLines.length);
}
const timeAndSettings = parseTimeAndSettings(timeString);
if (timeAndSettings === null) {
return null;
}
const { start, end, settings } = timeAndSettings;
return {
start: start + timeOffset,
end: end + timeOffset,
settings,
payload,
header,
};
}