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* Create extractCea608DataFromSample.ts * Create seiHelpers.ts * Update extractCea608DataFromSample.ts * Update seiHelpers.ts * Update getCharForByte.ts * ported changes from video-dev/hls.js#6427 * Create SccParser.ts * Update Cta608Parser.ts --------- Signed-off-by: Agajan Jumakuliyev <[email protected]>
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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) 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. | ||
| */ | ||
| function SccParser(processor: any, field: number | any = 1) { | ||
| let hasHeader = false; | ||
| let nrLinesParsed = 0; | ||
|
|
||
| function parse(text: string): void { | ||
| const lines = text.split(/\r?\n/); | ||
| nrLinesParsed = 0; | ||
|
|
||
| if (lines[0] === 'Scenarist_SCC V1.0') { | ||
| hasHeader = true; | ||
| nrLinesParsed++; | ||
| } | ||
|
|
||
| for (let l = 1; l < lines.length; l += 2) { | ||
| if (lines[l] !== '') { | ||
| break; // Every second line should be empty | ||
| } | ||
| nrLinesParsed++; | ||
| const lineData = parseDataLine(lines[l + 1]); | ||
| if (lineData === null) { | ||
| break; | ||
| } | ||
| nrLinesParsed++; | ||
| processor.addData(lineData[0], lineData[1]); | ||
| } | ||
| } | ||
|
|
||
| function parseDataLine(line: string): [number, number[]] | null { | ||
| if (!line) { | ||
| return null; | ||
| } | ||
|
|
||
| const lineParts = line.split(/\s+/); | ||
| const timeData = lineParts[0]; | ||
| const ceaData: number[] = []; | ||
|
|
||
| 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 = timeConverter(timeData); | ||
| return [time, ceaData]; | ||
| } | ||
|
|
||
| function timeConverter(smpteTs: string): number { | ||
| 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 | ||
| } | ||
|
|
||
| function getHeaderStatus() { | ||
| return hasHeader; | ||
| } | ||
|
|
||
| function getField() { | ||
| return field; | ||
| } | ||
|
|
||
| function getLinesParsed() { | ||
| return nrLinesParsed; | ||
| } | ||
|
|
||
| return { | ||
| parse, | ||
| getHeaderStatus, | ||
| getField, | ||
| getLinesParsed, | ||
| }; | ||
| } | ||
|
|
||
| export { SccParser }; |
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