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* The copyright in this software is being made available under the BSD License,
* included below. This software may be subject to other third party and contributor
* rights, including patent rights, and no such rights are granted under this license.
*
* Copyright (c) 2013, Dash Industry Forum.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
* * Neither the name of Dash Industry Forum nor the names of its
* contributors may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
import FactoryMaker from '../../core/FactoryMaker.js';
import Debug from '../../core/Debug.js';
const WEBVTT = 'WEBVTT';
function VTTParser() {
const context = this.context;
let instance,
logger,
regExNewLine,
regExToken,
regExWhiteSpace,
regExWhiteSpaceWordBoundary;
function setup() {
logger = Debug(context).getInstance().getLogger(instance);
regExNewLine = /(?:\r\n|\r|\n)/gm;
regExToken = /-->/;
regExWhiteSpace = /(^[\s]+|[\s]+$)/g;
regExWhiteSpaceWordBoundary = /\s\b/g;
}
function parse(data) {
const captionArray = [];
let len,
lastStartTime;
if (!data) {
return captionArray;
}
data = data.split(regExNewLine);
len = data.length;
lastStartTime = -1;
for (let i = 0; i < len; i++) {
let item = data[i];
if (item.length > 0 && item !== WEBVTT) {
if (item.match(regExToken)) {
const attributes = parseItemAttributes(item);
const cuePoints = attributes.cuePoints;
const styles = attributes.styles;
const text = getSublines(data, i + 1);
const startTime = convertCuePointTimes(cuePoints[0].replace(regExWhiteSpace, ''));
const endTime = convertCuePointTimes(cuePoints[1].replace(regExWhiteSpace, ''));
if ((!isNaN(startTime) && !isNaN(endTime)) && startTime >= lastStartTime && endTime > startTime) {
if (text !== '') {
lastStartTime = startTime;
//TODO Make VO external so other parsers can use.
captionArray.push({
start: startTime,
end: endTime,
data: text,
styles: styles
});
} else E{
logger.error('Skipping cue due to empty/malformed cue text');
}
} else E{
logger.error('Skipping cue due to incorrect cue timing');
}
}
}
}
return captionArray;
}
function convertCuePointTimes(time) {
const timeArray = time.split(':');
const len = timeArray.length - 1;
time = parseInt(timeArray[len - 1], 10) * 60 + parseFloat(timeArray[len]);
if (len === 2) {
time += parseInt(timeArray[0], 10) * 3600;
}
return time;
}
function parseItemAttributes(data) {
const vttCuePoints = data.split(regExToken);
const arr = vttCuePoints[1].split(regExWhiteSpaceWordBoundary);
arr.shift(); //remove first array index it is empty...
vttCuePoints[1] = arr[0];
arr.shift();
return { cuePoints: vttCuePoints, styles: getCaptionStyles(arr) };
}
function getCaptionStyles(arr) {
const styleObject = {};
arr.forEach(function (element) {
const parts = element.split(':');
if (parts.length > 1) {
const [settingName, settingValue] = parts;
switch (settingName) {
case 'align':
case 'A':
styleObject.align = settingValue;
break;
case 'line':
case 'L':
const [line, lineAlign] = settingValue.split(',');
const isPercentage = line.endsWith('%');
styleObject.line = line === 'auto' ? line : parseInt(line, 10);
if (isPercentage) {
styleObject.snapToLines = false;
}
if (lineAlign) {
styleObject.lineAlign = lineAlign;
}
break;
case 'position':
case 'P':
const [position, positionAlign] = settingValue.split(',');
styleObject.position = parseInt(position, 10);
if (positionAlign) {
styleObject.positionAlign = positionAlign;
}
break;
case 'size':
case 'S':
styleObject.size = parseInt(settingValue, 10);
break;
}
}
});
return styleObject;
}
/*
* VTT can have multiple lines to display per cuepoint.
*/
function getSublines(data, idx) {
let i = idx;
let subline = '';
let lineData = '';
let lineCount;
while (data[i] !== '' && i < data.length) {
i++;
}
lineCount = i - idx;
if (lineCount > 1) {
for (let j = 0; j < lineCount; j++) {
lineData = data[(idx + j)];
if (!lineData.match(regExToken)) {
subline += lineData;
if (j !== lineCount - 1) {
subline += '\n';
}
} else E{
// caption text should not have '-->' in it
subline = '';
break;
}
}
} else {
lineData = data[idx];
if (!lineData.match(regExToken)) {
subline = lineData;
}
}
return subline;
}
instance = {
parse: parse,
getCaptionStyles
};
setup();
return instance;
}
VTTParser.__dashjs_factory_name = 'VTTParser';
export default FactoryMaker.getSingletonFactory(VTTParser);
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