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possibility to import captions along side video, and have those converted into hypertranscript to use in autoEdit
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92
lib/interactive_transcription_generator/transcriber/captions/index.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| const fs = require('fs'); | ||
| const srtJsonToWordLinesJson = require('./srtJsonToWordLinesJson.js'); | ||
| const srtJsonWordLinesJsonToautoEditJson = require('./srtJsonWordLinesJsonToautoEditJson.js'); | ||
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| function convert(captionsFilePath){ | ||
| const captionsString = openFile(captionsFilePath); | ||
| var srtLineJson = convertSrtToJson(captionsString); | ||
| var srtLineJsonSecondsTimecodes = convertTimecodesToSeconds(srtLineJson); | ||
| var result = srtJsonToWordLinesJson(srtLineJsonSecondsTimecodes); | ||
| result = srtJsonWordLinesJsonToautoEditJson(result); | ||
| return result; | ||
| } | ||
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| function convertTimecodesToSeconds(srtLineJsonArray){ | ||
| var result = srtLineJsonArray.map((lineObject)=>{ | ||
| return { | ||
| startTime :timecodesToSeconds(lineObject.startTime), | ||
| endTime : timecodesToSeconds(lineObject.endTime), | ||
| id: lineObject.id, | ||
| text: lineObject.text | ||
| }; | ||
| }) | ||
| return result; | ||
| } | ||
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| /** | ||
| * @todo: this function is repeated from Rev conversion. absract as own module | ||
| * @param {stirng} timecodeStringHHMMSSFFF, eg '00:33:19,470' | ||
| * as described in their documentation https://www.rev.com/api/attachmentsgetcontent | ||
| * timestamp format is hh:mm:sss,fff | ||
| * where fff represents milliseconds | ||
| * @returns {number} - timecode in seconds | ||
| */ | ||
| function timecodesToSeconds(timecodeStringHHMMSSFFF){ | ||
| var tcArray = timecodeStringHHMMSSFFF.split(":"); | ||
| var hoursInSeconds = parseInt(tcArray[0],10) * 60 * 60; | ||
| var minutesInSeconds = parseInt(tcArray[1],10) * 60; | ||
| // seconds and milliseconds are joined together for this calculation by replacing the comma with a full stop. | ||
| var secondsAndMilliseconds = parseFloat(tcArray[2].replace(/,/,'.')); | ||
| return hoursInSeconds+minutesInSeconds+secondsAndMilliseconds; | ||
| } | ||
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| // convert srt | ||
| function convertSrtToJson(captionsString){ | ||
| //split srt string into array. where each element it's a line of the srt file. | ||
| var srtArray = captionsString.split("\n"); | ||
| //define regex for recognising components of the srt file. number. timecodes, words in a line, empty space between lines | ||
| //line counter regex | ||
| var oneDigit = /^[0-9]+$/; | ||
| //timecode regex | ||
| // "00:00:06,500 --> 00:00:10,790" there seems to be some cases where the milliseconds have 2 digits | ||
| var twoTimeCodes = /\d{2}:\d{2}:\d{2},\d{2,3} --> \d{2}:\d{2}:\d{2},\d{2,3}/ | ||
| var words = /\w/; | ||
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| //setup data structure to save results as as array of line objects. | ||
| var result = [] | ||
| // initialise first line object outside of the loop ensure persistency for the different attributes across file lines. | ||
| var lineO = {}; | ||
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| srtArray.forEach((line)=>{ | ||
| //issue a round charatcher windwos/mac \n \r messing up the code. | ||
| if(oneDigit.test(line.split("\r")[0])){ | ||
| //line object is reset when we encounter a new srt line counter, rather then after the line text, ebcause number of line text can be variable. | ||
| lineO = {}; | ||
| lineO.id = line; | ||
| }else if (twoTimeCodes.test(line)) { | ||
| var timecodes = line.split(" --> ") | ||
| lineO.startTime = timecodes[0] | ||
| lineO.endTime = timecodes[1] | ||
| //because number of lines in srt is variable, 1 or 2 generally, but we don't want to be opionionated about that just in case. and because We split on `\n` then needs to do a bunch of different passages to add all the text. so initialising the text as empty string after the timecode var is best way to add that attribute. | ||
| lineO.text =""; | ||
| }else if(words.test(line)){ | ||
| lineO.text +=line+"\n"; | ||
| }else{ | ||
| //also save line when done | ||
| result.push(lineO); | ||
| } | ||
| }) | ||
| return result; | ||
| } | ||
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| function openFile(filePath){ | ||
| return fs.readFileSync(filePath).toString('utf8'); | ||
| } | ||
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| module.exports = convert; | ||
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| // var sampleSrt = '/Users/pietropassarelli/Desktop/Demo_media/BBC_interview/23 glas blower INT.srt' | ||
| // convert(sampleSrt) |
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