Inspired by Cristóbal Sciutto's recent blog post on "home-cooked meal" style applications, I made a quick prototype for seeking through audio/transcript bidirectionally.
Created
August 12, 2022 21:24
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <link rel="preconnect" href="https://fonts.googleapis.com"> | |
| <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> | |
| <link href="https://fonts.googleapis.com/css2?family=Merriweather&display=swap" rel="stylesheet"> | |
| <title>Interactive Transcripts</title> | |
| </head> | |
| <style> | |
| body { | |
| font-family: 'Merriweather', sans-serif; | |
| background-color: sandybrown; | |
| } | |
| .container { | |
| display: flex; | |
| margin: 0 -4px; | |
| } | |
| .container > * { | |
| margin: 0 4px; | |
| background-color: aliceblue; | |
| flex: 1; | |
| } | |
| #script { | |
| padding: 8px; | |
| } | |
| .block:hover { | |
| background-color: aquamarine; | |
| cursor: pointer; | |
| } | |
| </style> | |
| <body> | |
| <div class="container"> | |
| <div id="script"></div> | |
| <div> | |
| <audio id="audio" src="49-software-longevity.mp3" controls></audio> | |
| </div> | |
| </div> | |
| </body> | |
| <script> | |
| let blockElements; | |
| let currentBlock; | |
| const parseSrt = (text) => { | |
| return text.split(/\n\s*\n/).map(parseBlock); | |
| }; | |
| const parseBlock = (block) => { | |
| [id, times, ...content] = block.split("\n"); | |
| [startTime, endTime] = parseTimes(times); | |
| content = content.join(" "); | |
| return { | |
| id, | |
| startTime, | |
| endTime, | |
| content, | |
| } | |
| }; | |
| const parseTimes = (times) => { | |
| return times.split(" --> ").map(timeToSeconds); | |
| }; | |
| const timeToSeconds = (time) => { | |
| let [hours, minutes, seconds, milliseconds] = time.split(/[:,]/).map(Number); | |
| return hours * 360 + minutes * 60 + seconds + milliseconds / 1000; | |
| }; | |
| const blockToElement = (block) => { | |
| let p = document.createElement("p"); | |
| p.dataset.startTime = block.startTime; | |
| p.dataset.endTime = block.endTime; | |
| p.classList.add("block"); | |
| let innerText = document.createTextNode(block.content); | |
| p.appendChild(innerText); | |
| p.addEventListener('click', clickBlock); | |
| return p; | |
| }; | |
| fetch('49__Software longevity.srt') | |
| .then(response => response.text()) | |
| .then(text => { | |
| blockElements = parseSrt(text).map(blockToElement); | |
| currentBlock = blockElements[0]; | |
| let scriptBody = document.createDocumentFragment(); | |
| for (element of blockElements) { | |
| scriptBody.appendChild(element); | |
| } | |
| document.getElementById("script").appendChild(scriptBody); | |
| }); | |
| const timeChange = (e) => { | |
| console.log("timeChange triggered!") | |
| let currentTime = e.target.currentTime; | |
| if (currentTime > currentBlock.dataset.startTime && currentTime < currentBlock.dataset.endTime) { | |
| } else { | |
| currentBlock.style.backgroundColor = 'initial'; | |
| let lastBlock = currentBlock; | |
| currentBlock = blockElements.find(block => currentTime > block.dataset.startTime && currentTime < block.dataset.endTime) | |
| if (currentBlock) { | |
| currentBlock.style.backgroundColor = 'yellow'; | |
| } else { | |
| currentBlock = lastBlock; | |
| } | |
| } | |
| } | |
| document.getElementById("audio").addEventListener("timeupdate", timeChange); | |
| const clickBlock = e => { | |
| let audio = document.getElementById("audio"); | |
| audio.currentTime = e.target.dataset.startTime; | |
| if (audio.paused) { | |
| audio.play(); | |
| } | |
| } | |
| </script> | |
| </html> |
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