audiobookshelf/server/utils/hlsPlaylistGenerator.js
2022-07-05 19:53:01 -05:00

35 lines
1.1 KiB
JavaScript

const fs = require('../libs/fsExtra')
function getPlaylistStr(segmentName, duration, segmentLength, hlsSegmentType, token) {
var ext = hlsSegmentType === 'fmp4' ? 'm4s' : 'ts'
var lines = [
'#EXTM3U',
'#EXT-X-VERSION:3',
'#EXT-X-ALLOW-CACHE:NO',
'#EXT-X-TARGETDURATION:6',
'#EXT-X-MEDIA-SEQUENCE:0',
'#EXT-X-PLAYLIST-TYPE:VOD'
]
if (hlsSegmentType === 'fmp4') {
lines.push('#EXT-X-MAP:URI="init.mp4"')
}
var numSegments = Math.floor(duration / segmentLength)
var lastSegment = duration - (numSegments * segmentLength)
for (let i = 0; i < numSegments; i++) {
lines.push(`#EXTINF:6,`)
lines.push(`${segmentName}-${i}.${ext}?token=${token}`)
}
if (lastSegment > 0) {
lines.push(`#EXTINF:${lastSegment},`)
lines.push(`${segmentName}-${numSegments}.${ext}?token=${token}`)
}
lines.push('#EXT-X-ENDLIST')
return lines.join('\n')
}
function generatePlaylist(outputPath, segmentName, duration, segmentLength, hlsSegmentType, token) {
var playlistStr = getPlaylistStr(segmentName, duration, segmentLength, hlsSegmentType, token)
return fs.writeFile(outputPath, playlistStr)
}
module.exports = generatePlaylist