@svta/common-media-library
Version:
A common library for media playback in JavaScript
100 lines • 3.98 kB
JavaScript
/**
* 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) 2015-2016, 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:
* 1. 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.
* 2. 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.
*/
/**
* SCC Parser
*
* @group CTA-608
* @beta
*/
export class SccParser {
constructor(processor, field = 1) {
this.hasHeader = false;
this.nrLinesParsed = 0;
this.processor = processor;
this.field = field;
}
parse(text) {
const lines = text.split(/\r?\n/);
this.nrLinesParsed = 0;
if (lines[0] === 'Scenarist_SCC V1.0') {
this.hasHeader = true;
this.nrLinesParsed++;
}
for (let l = 1; l < lines.length; l += 2) {
if (lines[l] !== '') {
break; // Every second line should be empty
}
this.nrLinesParsed++;
const lineData = this.parseDataLine(lines[l + 1]);
if (lineData === null) {
break;
}
this.nrLinesParsed++;
this.processor.addData(lineData[0], lineData[1]);
}
}
parseDataLine(line) {
if (!line) {
return null;
}
const lineParts = line.split(/\s+/);
const timeData = lineParts[0];
const ceaData = [];
for (let i = 1; i < lineParts.length; i++) {
const fourHexChars = lineParts[i];
const a = parseInt(fourHexChars.substring(0, 2), 16);
const b = parseInt(fourHexChars.substring(2, 4), 16);
ceaData.push(a, b);
}
const time = this.timeConverter(timeData);
return [time, ceaData];
}
timeConverter(smpteTs) {
const parts = smpteTs.split(':');
if (parts.length === 3) {
const lastParts = parts[2].split(';');
parts[2] = lastParts[0];
const frames = parseInt(lastParts[1], 10);
return (30 * (60 * (60 * parseInt(parts[0], 10) + parseInt(parts[1], 10)) + parseInt(parts[2], 10)) + frames) * 1001 / 30000;
}
return 0; // in case if format is incorrect
}
getHeaderStatus() {
return this.hasHeader;
}
getField() {
return this.field;
}
getLinesParsed() {
return this.nrLinesParsed;
}
}
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